Improve MinGW target of Makefile

It works now with an install of MinGW for both Win32 and Win64. It needs libpng and zlib. Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>
Point at the documentation from README
2025-11-20 10:12:06 +00:00 · 2017-04-17 17:28:07 +01:00 · 2017-04-17 14:49:57 +01:00 · 2017-04-17 14:15:46 +01:00 · 2017-04-16 23:08:33 +01:00 · 2017-04-16 22:52:10 +01:00
81 changed files with 5471 additions and 1110 deletions
--- a/.travis-deps.sh
+++ b/.travis-deps.sh
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+if [ $TRAVIS_OS_NAME = "osx" ]; then
+    brew update
+    brew install libpng pkg-config
+else # linux
+    sudo apt-get -qq update
+    sudo apt-get install -y -q bison flex libpng-dev pkg-config
+fi
+
+echo "Dependencies:"
+yacc --version
+flex --version
--- a/.travis.yml
+++ b/.travis.yml
@@ -0,0 +1,16 @@
+language: c
+sudo: required
+install:
+  - ./.travis-deps.sh
+os:
+  - linux
+  - osx
+compiler:
+  - clang
+  - gcc
+script:
+  - make
+  - sudo make install
+after_success:
+  - pushd test/asm/ && ./test.sh && popd
+  - pushd test/link/ && ./test.sh && popd
--- a/34
+++ b/34
@@ -1,34 +0,0 @@
-rgbasm and rgblink are derived from Justin Lloyd's RGBDS, which is
-released under the following license:
-
-                      DO WHATEVER PUBLIC LICENSE*
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
-
-  0. You can do whatever you want to with the work.
-  1. You cannot stop anybody from doing whatever they want to with the work.
-  2. You cannot revoke anybody elses DO WHATEVER PUBLIC LICENSE in the work.
-
- This program is free software. It comes without any warranty, to
- the extent permitted by applicable law. You can redistribute it
- and/or modify it under the terms of the DO WHATEVER PUBLIC LICENSE
- 
- Software originally created by Justin Lloyd @ http://otakunozoku.com/
-
-
-rgbfix was rewritten from scratch by Anthony J. Bentley, and is released
-under the ISC license; see the source file for the text of the license.
-
-rgbgfx was written by stag019, and is released under the ISC license.
-
-The UTF-8 decoder in src/asm/charmap.c was written by Björn Höhrmann and is
-released under the MIT license. The remainder of charmap.c was written by
-stag019, and is released under the ISC license.
-
-extern/err.c is derived from the Musl C library, http://www.musl-libc.org,
-and is released under the MIT license.
-
-extern/reallocarray.c is derived from the OpenBSD Project,
-http://www.openbsd.org, and is released under the ISC license.
-
-extern/strl.c is derived from the OpenBSD Project, http://www.openbsd.org,
-and is released under the BSD license.
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -0,0 +1,74 @@
+# Original code
+
+Copyright (C) 1997  Carsten Sorensen <surfsmurf@matilde.demon.co.uk>
+
+The ASMotor package (xAsm, xLink, RGBFix, examples and documentation) is
+freeware and distributed as is. The author retains his copyright and right to
+modify the specifications and operation of the software without notice.
+
+In other words this means I encourage you to...
+
+- use it for whatever purpose even professional work without me charging you a
+  penny
+- copy it to another person (wholly or in part, though I'm sure he'd appreciate
+  the whole package) in whatever form you find suitable
+- mass-distribute the ASMotor package if it is complete (xAsm, xLink, RGBFix and
+  documentation).
+- contact me if you have any problems
+
+This also means you can't...
+
+- blame me for loss of profit, data, sleep, food or other nasty things through
+  the use or distribution of ASMotor. If you choose to use ASMotor  you do so at
+  your own risk.
+- expect me to be able to help you should you have a problem related or not to
+  ASMotor.
+
+# Otaku no Zoku's modifications
+
+Copyright (C) 1999  Justin Lloyd <jlloyd@imf.la> (?)
+
+```
+                      DO WHATEVER PUBLIC LICENSE*
+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+  0. You can do whatever you want to with the work.
+  1. You cannot stop anybody from doing whatever they want to with the work.
+  2. You cannot revoke anybody elses DO WHATEVER PUBLIC LICENSE in the work.
+
+ This program is free software. It comes without any warranty, to
+ the extent permitted by applicable law. You can redistribute it
+ and/or modify it under the terms of the DO WHATEVER PUBLIC LICENSE
+
+ Software originally created by Justin Lloyd @ http://otakunozoku.com/
+```
+
+# rgbds-linux
+
+Copyright (C) 2009  Vegard Nossum <vegard.nossum@gmail.com>
+
+# Current
+
+rgbasm and rgblink are derived from Justin Lloyd's RGBDS.
+
+rgbfix was rewritten from scratch by Anthony J. Bentley, and is released
+under the ISC license; see the source file for the text of the license.
+
+rgbgfx was written by stag019, and is released under the ISC license.
+
+Some files of rgblink were written by Antonio Niño Díaz, and they are relased
+under the ISC license. The affected files have the appropriate license in the
+header of the file.
+
+The UTF-8 decoder in src/asm/charmap.c was written by Björn Höhrmann and is
+released under the MIT license. The remainder of charmap.c was written by
+stag019, and is released under the ISC license.
+
+extern/err.c is derived from the Musl C library, http://www.musl-libc.org,
+and is released under the MIT license.
+
+extern/reallocarray.c is derived from the OpenBSD Project,
+http://www.openbsd.org, and is released under the ISC license.
+
+extern/strl.c is derived from the OpenBSD Project, http://www.openbsd.org,
+and is released under the BSD license.
--- a/121
+++ b/121
@@ -1,14 +1,23 @@
-PKG_CONFIG =	pkg-config
-WARNFLAGS =	-Wall -Werror=implicit
-PNGFLAGS !=	${PKG_CONFIG} --cflags libpng
-REALCFLAGS =	${CFLAGS} ${WARNFLAGS} ${PNGFLAGS} -Iinclude -g \
+PKG_CONFIG	= pkg-config
+WARNFLAGS	= -Wall -Werror
+PNGFLAGS	!= ${PKG_CONFIG} --cflags libpng
+REALCFLAGS	= ${CFLAGS} ${WARNFLAGS} ${PNGFLAGS} -Iinclude -g \
 		-std=c99 -D_POSIX_C_SOURCE=200809L

+LFLAGS		:= --nounistd
+
+YACC		:= yacc
+FLEX		:= flex
+RM		:= rm -rf
+
 # User-defined variables
-PREFIX =	/usr/local
-BINPREFIX =	${PREFIX}/bin
-MANPREFIX =	${PREFIX}/man
-Q =		@
+PREFIX		= /usr/local
+bindir		= ${PREFIX}/bin
+mandir		= ${PREFIX}/man
+Q		= @
+STRIP		= -s
+BINMODE		= 555
+MANMODE		= 444

 rgbasm_obj = \
 	src/asm/asmy.o \
@@ -29,12 +38,15 @@ rgbasm_obj = \

 rgblink_obj = \
 	src/link/assign.o \
+	src/link/lexer.o \
 	src/link/library.o \
 	src/link/main.o \
 	src/link/mapfile.o \
 	src/link/object.o \
 	src/link/output.o \
 	src/link/patch.o \
+	src/link/parser.o \
+	src/link/script.o \
 	src/link/symbol.o \
 	src/extern/err.o

@@ -51,25 +63,30 @@ rgbgfx_obj = \
 all: rgbasm rgblink rgbfix rgbgfx

 clean:
-	$Qrm -rf rgbds.html
-	$Qrm -rf rgbasm rgbasm.exe ${rgbasm_obj} rgbasm.html
-	$Qrm -rf rgblink rgblink.exe ${rgblink_obj} rgblink.html
-	$Qrm -rf rgbfix rgbfix.exe ${rgbfix_obj} rgbfix.html
-	$Qrm -rf rgbgfx rgbgfx.exe ${rgbgfx_obj} rgbgfx.html
-	$Qrm -rf src/asm/asmy.c src/asm/asmy.h
+	$Q${RM} rgbds.7.html gbz80.7.html rgbds.5.html
+	$Q${RM} rgbasm rgbasm.exe ${rgbasm_obj} rgbasm.1.html rgbasm.5.html
+	$Q${RM} rgblink rgblink.exe ${rgblink_obj} rgblink.1.html rgblink.5.html
+	$Q${RM} rgbfix rgbfix.exe ${rgbfix_obj} rgbfix.1.html
+	$Q${RM} rgbgfx rgbgfx.exe ${rgbgfx_obj} rgbgfx.1.html
+	$Q${RM} src/asm/asmy.c src/asm/asmy.h
+	$Q${RM} src/link/lexer.c src/link/parser.c src/link/parser.h

 install: all
-	$Qmkdir -p ${BINPREFIX}
-	$Qinstall -s -m 555 rgbasm ${BINPREFIX}/rgbasm
-	$Qinstall -s -m 555 rgbfix ${BINPREFIX}/rgbfix
-	$Qinstall -s -m 555 rgblink ${BINPREFIX}/rgblink
-	$Qinstall -s -m 555 rgbgfx ${BINPREFIX}/rgbgfx
-	$Qmkdir -p ${MANPREFIX}/man1 ${MANPREFIX}/man7
-	$Qinstall -m 444 src/rgbds.7 ${MANPREFIX}/man7/rgbds.7
-	$Qinstall -m 444 src/asm/rgbasm.1 ${MANPREFIX}/man1/rgbasm.1
-	$Qinstall -m 444 src/fix/rgbfix.1 ${MANPREFIX}/man1/rgbfix.1
-	$Qinstall -m 444 src/link/rgblink.1 ${MANPREFIX}/man1/rgblink.1
-	$Qinstall -m 444 src/gfx/rgbgfx.1 ${MANPREFIX}/man1/rgbgfx.1
+	$Qmkdir -p ${DESTDIR}${bindir}
+	$Qinstall ${STRIP} -m ${BINMODE} rgbasm ${DESTDIR}${bindir}/rgbasm
+	$Qinstall ${STRIP} -m ${BINMODE} rgbfix ${DESTDIR}${bindir}/rgbfix
+	$Qinstall ${STRIP} -m ${BINMODE} rgblink ${DESTDIR}${bindir}/rgblink
+	$Qinstall ${STRIP} -m ${BINMODE} rgbgfx ${DESTDIR}${bindir}/rgbgfx
+	$Qmkdir -p ${DESTDIR}${mandir}/man1 ${DESTDIR}${mandir}/man5 ${DESTDIR}${mandir}/man7
+	$Qinstall -m ${MANMODE} src/rgbds.7 ${DESTDIR}${mandir}/man7/rgbds.7
+	$Qinstall -m ${MANMODE} src/gbz80.7 ${DESTDIR}${mandir}/man7/gbz80.7
+	$Qinstall -m ${MANMODE} src/rgbds.5 ${DESTDIR}${mandir}/man7/rgbds.5
+	$Qinstall -m ${MANMODE} src/asm/rgbasm.1 ${DESTDIR}${mandir}/man1/rgbasm.1
+	$Qinstall -m ${MANMODE} src/asm/rgbasm.5 ${DESTDIR}${mandir}/man1/rgbasm.5
+	$Qinstall -m ${MANMODE} src/fix/rgbfix.1 ${DESTDIR}${mandir}/man1/rgbfix.1
+	$Qinstall -m ${MANMODE} src/link/rgblink.1 ${DESTDIR}${mandir}/man1/rgblink.1
+	$Qinstall -m ${MANMODE} src/link/rgblink.5 ${DESTDIR}${mandir}/man5/rgblink.5
+	$Qinstall -m ${MANMODE} src/gfx/rgbgfx.1 ${DESTDIR}${mandir}/man1/rgbgfx.1

 rgbasm: ${rgbasm_obj}
 	$Q${CC} ${REALCFLAGS} -o $@ ${rgbasm_obj} -lm
@@ -86,37 +103,55 @@ rgbgfx: ${rgbgfx_obj}
 .y.c:
 	$Q${YACC} -d ${YFLAGS} -o $@ $<

+.l.o:
+	$Q${RM} $*.c
+	$Q${FLEX} ${LFLAGS} -o $*.c $<
+	$Q${CC} ${REALCFLAGS} -c -o $@ $*.c
+	$Q${RM} $*.c
+
 .c.o:
 	$Q${CC} ${REALCFLAGS} -c -o $@ $<

 src/asm/locallex.o src/asm/globlex.o src/asm/lexer.o: src/asm/asmy.h
 src/asm/asmy.h: src/asm/asmy.c

+src/link/lexer.o : src/link/parser.h
+src/link/parser.h : src/link/parser.c
+
 # Below is a target for the project maintainer to easily create win32 exes.
 # This is not for Windows users!
 # If you're building on Windows with Cygwin or Mingw, just follow the Unix
 # install instructions instead.
 mingw:
-	$Qenv PATH=/usr/local/mingw32/bin:/bin:/usr/bin:/usr/local/bin \
-		make WARNFLAGS= CC=gcc CFLAGS="-I/usr/local/mingw32/include \
-			${CFLAGS}"
-	$Qmv rgbasm rgbasm.exe
-	$Qmv rgblink rgblink.exe
-	$Qmv rgbfix rgbfix.exe
-	$Qmv rgbgfx rgbgfx.exe
+	$Q${RM} win32 win64
+	$Qmkdir win32 win64
+	$Qenv make clean
+	$Qenv PKG_CONFIG_PATH=/usr/i686-w64-mingw32/sys-root/mingw/lib/pkgconfig/ \
+		make CC=i686-w64-mingw32-gcc YACC=bison WARNFLAGS= -j
+	$Qmv rgbasm win32/rgbasm.exe
+	$Qmv rgblink win32/rgblink.exe
+	$Qmv rgbfix win32/rgbfix.exe
+	$Qmv rgbgfx win32/rgbgfx.exe
+	$Qenv make clean
+	$Qenv PKG_CONFIG_PATH=/usr/x86_64-w64-mingw32/sys-root/mingw/lib/pkgconfig/ \
+		make CC=x86_64-w64-mingw32-gcc YACC=bison WARNFLAGS= -j
+	$Qmv rgbasm win64/rgbasm.exe
+	$Qmv rgblink win64/rgblink.exe
+	$Qmv rgbfix win64/rgbfix.exe
+	$Qmv rgbgfx win64/rgbgfx.exe
+	$Qenv make clean

 # Below is a target for the project maintainer to easily create web manuals.
 # It relies on mandoc: http://mdocml.bsd.lv
-MANDOC =	-Thtml -Ios=General -Oman=/rgbds/manual/%N/ \
-			-Ostyle=/rgbds/manual/manual.css
+MANDOC =	-Thtml -Ios=General -Oman=%N.%S.html -Ostyle=manual.css

 wwwman:
-	$Qmandoc ${MANDOC} src/rgbds.7 | sed s/OpenBSD/General/ > rgbds.html
-	$Qmandoc ${MANDOC} src/asm/rgbasm.1 | sed s/OpenBSD/General/ > \
-		rgbasm.html
-	$Qmandoc ${MANDOC} src/fix/rgbfix.1 | sed s/OpenBSD/General/ > \
-		rgbfix.html
-	$Qmandoc ${MANDOC} src/link/rgblink.1 | sed s/OpenBSD/General/ > \
-		rgblink.html
-	$Qmandoc ${MANDOC} src/gfx/rgbgfx.1 | sed s/OpenBSD/General/ > \
-		rgbgfx.html
+	$Qmandoc ${MANDOC} src/rgbds.7 > rgbds.7.html
+	$Qmandoc ${MANDOC} src/gbz80.7 > gbz80.7.html
+	$Qmandoc ${MANDOC} src/rgbds.5 > rgbds.5.html
+	$Qmandoc ${MANDOC} src/asm/rgbasm.1 > rgbasm.1.html
+	$Qmandoc ${MANDOC} src/asm/rgbasm.5 > rgbasm.5.html
+	$Qmandoc ${MANDOC} src/fix/rgbfix.1 > rgbfix.1.html
+	$Qmandoc ${MANDOC} src/link/rgblink.1 > rgblink.1.html
+	$Qmandoc ${MANDOC} src/link/rgblink.5 > rgblink.5.html
+	$Qmandoc ${MANDOC} src/gfx/rgbgfx.1 > rgbgfx.1.html
--- a/README.md
+++ b/README.md
@@ -8,63 +8,151 @@ for the Game Boy and Game Boy Color. It consists of:
  - rgbfix  (checksum/header fixer)
  - rgbgfx  (PNG‐to‐Game Boy graphics converter)

-rgbds-linux is a fork of the original RGBDS which aims to make the programs
-more like other UNIX tools.
+This is a fork of the original RGBDS which aims to make the programs more like
+other UNIX tools.
+
+This toolchain is maintained on [GitHub](https://github.com/rednex/rgbds), as
+well as its [documentation](https://github.com/rednex/rednex.github.io).
+
+The documentation of this toolchain can be viewed online
+[here](https://rednex.github.io/), it is generated from the man pages found in
+this repository.
+
+## 1. Installing RGBDS
+
+### 1.1 Windows
+
+Windows builds are available in the releases page on GitHub:
+
+    https://github.com/rednex/rgbds/releases
+
+Copy the `.exe` files to `C:\Windows\` or similar.
+
+If you require the latest version in development, it should be possible to
+compile RGBDS with MinGW or Cygwin by following the instructions to build it
+on UNIX systems.
+
+### 1.2 macOS
+
+You can build RGBDS by following the instructions below. However, if you would
+prefer not to build RGBDS yourself, you may also install it using
+[Homebrew](http://brew.sh/).
+
+To install the latest release, use:
+
+```sh
+brew install rgbds
+```
+
+To install RGBDS with all of the current changes in development (as seen on the
+`master` branch on GitHub), use:
+
+```sh
+brew install rgbds --HEAD
+```
+
+### 1.3 Other UNIX-like systems
+
+No official binaries of RGBDS are distributed for these systems, you must follow
+the simple instructions below to compile and install it.


-## Installing RGBDS (UNIX)
+## 2. Building RGBDS from source

-RGBDS requires libpng and pkg-config to be installed.
+RGBDS can be built in UNIX-like systems by following the instructions below.

-On Mac OS X, install them with [Homebrew](http://brew.sh/). On other Unixes,
-use the built-in package manager.
+### 2.1 Dependencies

-You can test if they're installed by running `pkg-config --cflags libpng`:
-if the output is a path, then you're good, and if it outputs an error then
-you need to install them via a package manager.
+RGBDS requires yacc, flex, libpng and pkg-config to be installed.

-To build the programs on a UNIX or UNIX-like system, just run in your terminal:
+On macOS, install the latter two with [Homebrew](http://brew.sh/):
+
+```sh
+brew install libpng pkg-config
+```
+
+On other Unixes, use the built-in package manager. For example, on Debian or
+Ubuntu:
+
+```sh
+sudo apt-get install byacc flex pkg-config libpng-dev
+```
+
+You can test if libpng and pkg-config are installed by running
+`pkg-config --cflags libpng`: if the output is a path, then you're good, and if
+it outputs an error then you need to install them via a package manager.
+
+### 2.2 Build process
+
+To build the programs, run in your terminal:

 ```sh
 make
 ```

-Then to install the compiled programs and manual pages, run (with appropriate
-privileges):
+Then, to install the compiled programs and manual pages, run (with appropriate
+privileges, e.g, with `sudo`):
+

 ```sh
 make install
 ```

-After installation, you can read the manuals with the man(1) command. E.g.,
+After installation, you can read the manuals with the `man` command. E.g.,

 ```sh
-man 1 rgbasm
+man 7 rgbds
 ```

-Note: the variables described below can affect installation behavior when given
-on the make command line. For example, to install rgbds in your home directory
-instead of systemwide, run the following:
+There are some variables in the Makefile that can be redefined by the user. The
+variables described below can affect installation behavior when given on the
+make command line. For example, to install RGBDS in your home directory instead
+of systemwide, run the following:

 ```sh
 mkdir -p $HOME/{bin,man/man1,man/man7}
 make install PREFIX=$HOME
 ```

-`PREFIX`: Location where RGBDS will be installed. Defaults to /usr/local.
+To do a verbose build, run:

-`BINPREFIX`: Location where the RGBDS programs will be installed. Defaults
-to ${PREFIX}/bin.
+```sh
+make Q=
+```

-`MANPREFIX`: Location where the RGBDS man pages will be installed. Defaults
-to ${PREFIX}/man.
+This is the complete list of user-defined variables:

-`Q`: Whether to quiet the build or not. To make the build more verbose, clear
-this variable. Defaults to @.
+- `PREFIX`: Location where RGBDS will be installed. Defaults to `/usr/local`.

+- `bindir`: Location where the binaries will be installed. Defaults to `${PREFIX}/bin`.

-## Installing RGBDS (Windows)
+- `mandir`: Location where the manpages will be installed. Defaults to `${PREFIX}/man`.

-Windows builds are available here: https://github.com/bentley/rgbds/releases
+- `DESTDIR`: This is prepended to all paths during the installation. It is
+  mainly used for packaging.

-Copy the .exe files to C:\Windows\ or similar.
+- `Q`: Whether to quiet the build or not. To make the build more verbose, clear
+  this variable. Defaults to `@`.
+
+- `STRIP`: Whether to strip the installed binaries of debug symbols or not.
+  Defaults to `-s`.
+
+- `BINMODE`: Permissions of the installed binaries. Defaults to `555`.
+
+- `MANMODE`: Permissions of the installed manpages. Defaults to `444`.
+
+## 3 History
+
+- Around 1997, Carsten Sorensen (AKA SurfSmurf) writes ASMotor as a
+  general-purpose assembler/linker system for DOS/Win32
+
+- Around 1999, Justin Lloyd (AKA Otaku no Zoku) adapts ASMotor to read and
+  produce GBZ80 assembly/machine code, and releases this version as RGBDS.
+
+- 2009, Vegard Nossum adapts the code to be more UNIX-like and releases this
+  version as rgbds-linux on [GitHub](https://github.com/vegard/rgbds-linux).
+
+- 2010, Anthony J. Bentley forks that repository. The fork becomes the reference
+  implementation of rgbds.
+
+- 2017, Bentley's repository is moved to a neutral name.
--- a/include/asm/localasm.h
+++ b/include/asm/localasm.h
@@ -4,80 +4,79 @@
 n  = 8-bit
 nn = 16-bit

-*ADC  A,n				:	0xCE
-*ADC  A,r				:	0x88|r
-*ADD  A,n				:	0xC6
-*ADD  A,r				:	0x80|r
-*ADD  HL,ss			:	0x09|(ss<<4)
-*ADD  SP,n			:	0xE8
-*AND  A,n				:	0xE6
-*AND  A,r				:	0xA0|r
-*BIT  n3,r			:	0xCB 0x40|(n3<<3)|r
-*CALL cc,nn 			:	0xC4|(cc<<3)
-*CALL nn				:	0xCD
-*CCF					:	0x3F
-*CP   A,n				:	0xFE
-*CP   A,r				:	0xB8|r
-*CPL					:	0x2F
-*DAA					:	0x27
-*DEC  r 				:	0x05|(r<<3)
-*DEC  ss				:	0x0B|(ss<<4)
-*DI						:	0xF3
-*EI						:	0xFB
-*EX   HL,(SP)		:	0xE3
-*HALT					:	0x76
-*INC  r 				:	0x04|(r<<3)
-*INC  ss				:	0x03|(ss<<4)
-*JP   (HL)			:	0xE9
-*JP   cc,nn 			:	0xC2|(cc<<3)
-*JP   nn 				:	0xC3|(cc<<3)
-*JR	n				:	0x18
-*JR   cc,n 			:	0x20|(cc<<3)
-*LD	(nn),SP		:	0x08
-*LD   ($FF00+C),A	:	0xE2
-*LD   ($FF00+n),A	:	0xE0
-*LD   (nn),A			:	0xEA
-*LD   (rr),A			:	0x02|(rr<<4)
-*LD   A,($FF00+C)	:	0xF2
-*LD   A,($FF00+n)	:	0xF0
-*LD   A,(nn)			:	0xFA
-*LD   A,(rr)			:	0x0A|(rr<<4)
-*LD   HL,(SP+n)		:	0xF8
-*LD   SP,HL			:	0xF9
-*LD   r,n				:	0x06|(r<<3)
-*LD   r,r' 			:	0x40|(r<<3)|r' // NOTE: LD (HL),(HL) not allowed
-*LD   ss,nn			:	0x01|(ss<<4)
-*NOP					:	0x00
-*OR   A,n				:	0xF6
-*OR   A,r				:	0xB0|r
-*POP  tt				:	0xC1|(tt<<4)
-*PUSH tt				:	0xC5|(tt<<4)
-*RES  n3,r			:	0xCB 0x80|(n3<<3)|r
-*RET					:	0xC9
-*RET  cc				:	0xC0|(cc<<3)
-*RETI					:	0xD9
-*RL   r				:	0xCB 0x10|r
-*RLA					:	0x17
-*RLC  r				:	0xCB 0x00|r
-*RLCA					:	0x07
-*RR   r				:	0xCB 0x18|r
-*RRA					:	0x1F
-*RRC  r				:	0xCB 0x08|r
-*RRCA					:	0x0F
-*RST  n				:	0xC7|n
-*SBC  A,n				:	0xDE
-*SBC  A,r				:	0x98|r
-*SCF					:	0x37
-*SET  n3,r			:	0xCB 0xC0|(n8<<3)|r
-*SLA  r				:	0xCB 0x20|r
-*SRA  r				:	0xCB 0x28|r
-*SRL  r				:	0xCB 0x38|r
-*STOP					:	0x10
-*SUB  A,n				:	0xD6
-*SUB  A,r				:	0x90|r
-*SWAP r				:	0xCB 0x30|r
-*XOR  A,n				:	0xEE
-*XOR  A,r				:	0xA8|r
+* ADC  A,n		:	0xCE
+* ADC  A,r		:	0x88|r
+* ADD  A,n		:	0xC6
+* ADD  A,r		:	0x80|r
+* ADD  HL,ss		:	0x09|(ss<<4)
+* ADD  SP,n		:	0xE8
+* AND  A,n		:	0xE6
+* AND  A,r		:	0xA0|r
+* BIT  n3,r		:	0xCB 0x40|(n3<<3)|r
+* CALL cc,nn 		:	0xC4|(cc<<3)
+* CALL nn		:	0xCD
+* CCF			:	0x3F
+* CP   A,n		:	0xFE
+* CP   A,r		:	0xB8|r
+* CPL			:	0x2F
+* DAA			:	0x27
+* DEC  r 		:	0x05|(r<<3)
+* DEC  ss		:	0x0B|(ss<<4)
+* DI			:	0xF3
+* EI			:	0xFB
+* HALT			:	0x76
+* INC  r 		:	0x04|(r<<3)
+* INC  ss		:	0x03|(ss<<4)
+* JP   HL		:	0xE9
+* JP   cc,nn 		:	0xC2|(cc<<3)
+* JP   nn 		:	0xC3|(cc<<3)
+* JR   n		:	0x18
+* JR   cc,n 		:	0x20|(cc<<3)
+* LD   (nn),SP		:	0x08
+* LD   ($FF00+C),A	:	0xE2
+* LD   ($FF00+n),A	:	0xE0
+* LD   (nn),A		:	0xEA
+* LD   (rr),A		:	0x02|(rr<<4) // HL+ and HL- included
+* LD   A,($FF00+C)	:	0xF2
+* LD   A,($FF00+n)	:	0xF0
+* LD   A,(nn)		:	0xFA
+* LD   A,(rr)		:	0x0A|(rr<<4) // HL+ and HL- included
+* LD   HL,SP+n		:	0xF8
+* LD   SP,HL		:	0xF9
+* LD   r,n		:	0x06|(r<<3)
+* LD   r,r' 		:	0x40|(r<<3)|r' // NOTE: LD (HL),(HL) not allowed
+* LD   ss,nn		:	0x01|(ss<<4)
+* NOP			:	0x00
+* OR   A,n		:	0xF6
+* OR   A,r		:	0xB0|r
+* POP  tt		:	0xC1|(tt<<4)
+* PUSH tt		:	0xC5|(tt<<4)
+* RES  n3,r		:	0xCB 0x80|(n3<<3)|r
+* RET			:	0xC9
+* RET  cc		:	0xC0|(cc<<3)
+* RETI			:	0xD9
+* RL   r		:	0xCB 0x10|r
+* RLA			:	0x17
+* RLC  r		:	0xCB 0x00|r
+* RLCA			:	0x07
+* RR   r		:	0xCB 0x18|r
+* RRA			:	0x1F
+* RRC  r		:	0xCB 0x08|r
+* RRCA			:	0x0F
+* RST  n		:	0xC7|n
+* SBC  A,n		:	0xDE
+* SBC  A,r		:	0x98|r
+* SCF			:	0x37
+* SET  n3,r		:	0xCB 0xC0|(n8<<3)|r
+* SLA  r		:	0xCB 0x20|r
+* SRA  r		:	0xCB 0x28|r
+* SRL  r		:	0xCB 0x38|r
+* STOP			:	0x10 0x00
+* SUB  A,n		:	0xD6
+* SUB  A,r		:	0x90|r
+* SWAP r		:	0xCB 0x30|r
+* XOR  A,n		:	0xEE
+* XOR  A,r		:	0xA8|r

 */

--- a/include/asm/main.h
+++ b/include/asm/main.h
@@ -11,6 +11,7 @@ struct sOptions {
 	bool verbose;
 	bool haltnop;
 	bool exportall;
+	bool warnings; /* true to enable warnings, false to disable them. */
 	    //-1 == random
 };

@@ -27,6 +28,7 @@ extern void opt_Parse(char *s);

 noreturn void fatalerror(const char *fmt, ...);
 void yyerror(const char *fmt, ...);
+void warning(const char *fmt, ...);

 #define	YY_FATAL_ERROR fatalerror

--- a/include/asm/mylink.h
+++ b/include/asm/mylink.h
@@ -1,60 +1,6 @@
 #ifndef RGBDS_ASM_LINK_H
 #define RGBDS_ASM_LINK_H

-/* RGB0 .obj format:
- *
- * Header
- * Symbols
- * Sections
- *
- * Header:
- * "RGB0"
- * LONG NumberOfSymbols
- * LONG NumberOfSections
- *
- * Symbols:
- * Symbol[NumberOfSymbols]
- *
- * Symbol:
- * char Name (NULL terminated)
- * char nType
- * if( nType!=SYM_IMPORT )
- * {
- *		LONG SectionID
- *		LONG Offset
- * }
- *
- * Sections:
- * Section[NumberOfSections]
- *
- * Section:
- * LONG SizeInBytes
- * char Type
- * if( Type!=WRAM0 )
- * {
- *		char Data[SizeInBytes]
- *		Patches
- * }
- *
- * Patches:
- * LONG NumberOfPatches
- * Patch[NumberOfPatches]
- *
- * Patch:
- * char Filename NULL-terminated
- * LONG LineNo
- * LONG Offset
- * char Type
- * LONG RpnByteSize
- * Rpn[RpnByteSize]
- *
- * Rpn:
- * Operators: 0x00-0x7F
- * Constants: 0x80 0x00000000
- * Symbols  : 0x81 0x00000000
- *
- */
-
 enum {
 	RPN_ADD = 0,
 	RPN_SUB,
@@ -86,10 +32,6 @@ enum {

 	RPN_HRAM,

-	RPN_PCEZP,
-
-	RPN_RANGECHECK,
-
 	RPN_CONST = 0x80,
 	RPN_SYM = 0x81
 };
@@ -101,7 +43,8 @@ enum {
 	SECT_ROM0,
 	SECT_HRAM,
 	SECT_WRAMX,
-	SECT_SRAM
+	SECT_SRAM,
+	SECT_OAM
 };

 enum {
@@ -113,8 +56,6 @@ enum {
 enum {
 	PATCH_BYTE = 0,
 	PATCH_WORD_L,
-	PATCH_LONG_L,
-	PATCH_WORD_B,
-	PATCH_LONG_B
+	PATCH_LONG_L
 };
 #endif
--- a/include/asm/output.h
+++ b/include/asm/output.h
@@ -10,6 +10,7 @@ struct Section {
 	ULONG nPC;
 	ULONG nOrg;
 	ULONG nBank;
+	ULONG nAlign;
 	struct Section *pNext;
 	struct Patch *pPatches;
 	struct Charmap *charmap;
@@ -20,6 +21,7 @@ void out_PrepPass2(void);
 void out_SetFileName(char *s);
 void out_NewSection(char *pzName, ULONG secttype);
 void out_NewAbsSection(char *pzName, ULONG secttype, SLONG org, SLONG bank);
+void out_NewAlignedSection(char *pzName, ULONG secttype, SLONG alignment, SLONG bank);
 void out_AbsByte(int b);
 void out_AbsByteGroup(char *s, int length);
 void out_RelByte(struct Expression * expr);
--- a/include/asm/rpn.h
+++ b/include/asm/rpn.h
@@ -15,68 +15,67 @@ ULONG rpn_isPCRelative(struct Expression * expr);
 void rpn_Symbol(struct Expression * expr, char *tzSym);
 void rpn_Number(struct Expression * expr, ULONG i);
 void rpn_LOGNOT(struct Expression * expr, struct Expression * src1);
-void 
+void
 rpn_LOGOR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGAND(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGEQU(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGGT(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGLT(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGGE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGLE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_LOGNE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_ADD(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_SUB(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_XOR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_OR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_AND(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_SHL(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_SHR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_MUL(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_DIV(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
-void 
+void
 rpn_MOD(struct Expression * expr, struct Expression * src1,
    struct Expression * src2);
+void rpn_HIGH(struct Expression * expr, struct Expression * src);
+void rpn_LOW(struct Expression * expr, struct Expression * src);
 void rpn_UNNEG(struct Expression * expr, struct Expression * src);
 void rpn_UNNOT(struct Expression * expr, struct Expression * src);
 UWORD rpn_PopByte(struct Expression * expr);
 void rpn_Bank(struct Expression * expr, char *tzSym);
 void rpn_Reset(struct Expression * expr);
-int 
-rpn_RangeCheck(struct Expression * expr, struct Expression * src, SLONG low,
-    SLONG high);
 void rpn_CheckHRAM(struct Expression * expr, struct Expression * src1);

 #endif
--- a/include/asm/symbol.h
+++ b/include/asm/symbol.h
@@ -54,7 +54,6 @@ void sym_AddEqu(char *tzSym, SLONG value);
 void sym_AddSet(char *tzSym, SLONG value);
 void sym_Init(void);
 ULONG sym_GetConstantValue(char *s);
-void sym_Import(char *tzSym);
 ULONG sym_isConstant(char *s);
 struct sSymbol *sym_FindSymbol(char *tzName);
 void sym_Global(char *tzSym);
@@ -71,5 +70,6 @@ ULONG sym_GetDefinedValue(char *s);
 ULONG sym_isDefined(char *tzName);
 void sym_Purge(char *tzName);
 ULONG sym_isConstDefined(char *tzName);
+int sym_IsRelocDiffDefined(char *tzSym1, char *tzSym2);

 #endif
--- a/include/extern/stdnoreturn.h
+++ b/include/extern/stdnoreturn.h
@@ -12,5 +12,5 @@
    #define noreturn _declspec( noreturn)
 #else
    /* unsupported, but no need to throw a fit */
-    #define noreturn 
+    #define noreturn
 #endif
--- a/include/link/assign.h
+++ b/include/link/assign.h
@@ -1,30 +1,33 @@
 #ifndef RGBDS_LINK_ASSIGN_H
 #define RGBDS_LINK_ASSIGN_H

+#include "mylink.h"
 #include "types.h"

-enum eBankDefine {
-	BANK_ROM0 = 0,
-	BANK_ROMX,
-	BANK_WRAM0 = 512,
-	BANK_WRAMX,
-	BANK_VRAM = 520,
-	BANK_HRAM = 522,
-	BANK_SRAM = 523
-};
-
 enum eBankCount {
 	BANK_COUNT_ROM0 = 1,
 	BANK_COUNT_ROMX = 511,
 	BANK_COUNT_WRAM0 = 1,
 	BANK_COUNT_WRAMX = 7,
 	BANK_COUNT_VRAM = 2,
+	BANK_COUNT_OAM  = 1,
 	BANK_COUNT_HRAM = 1,
 	BANK_COUNT_SRAM = 16
 };

+enum eBankDefine {
+	BANK_ROM0  = 0,
+	BANK_ROMX  = BANK_ROM0  + BANK_COUNT_ROM0,
+	BANK_WRAM0 = BANK_ROMX  + BANK_COUNT_ROMX,
+	BANK_WRAMX = BANK_WRAM0 + BANK_COUNT_WRAM0,
+	BANK_VRAM  = BANK_WRAMX + BANK_COUNT_WRAMX,
+	BANK_OAM   = BANK_VRAM  + BANK_COUNT_VRAM,
+	BANK_HRAM  = BANK_OAM   + BANK_COUNT_OAM,
+	BANK_SRAM  = BANK_HRAM  + BANK_COUNT_HRAM
+};
+
 #define MAXBANKS	(BANK_COUNT_ROM0 + BANK_COUNT_ROMX + BANK_COUNT_WRAM0 + BANK_COUNT_WRAMX \
-					+ BANK_COUNT_VRAM + BANK_COUNT_HRAM + BANK_COUNT_SRAM)
+					+ BANK_COUNT_VRAM + BANK_COUNT_OAM + BANK_COUNT_HRAM + BANK_COUNT_SRAM)

 extern SLONG area_Avail(SLONG bank);
 extern void AssignSections(void);
@@ -32,4 +35,16 @@ extern void CreateSymbolTable(void);
 extern SLONG MaxBankUsed;
 extern SLONG MaxAvail[MAXBANKS];

+int
+IsSectionNameInUse(const char *name);
+
+void
+SetLinkerscriptName(char *tzLinkerscriptFile);
+
+int
+IsSectionSameTypeBankAndFloating(const char *name, enum eSectionType type, int bank);
+
+unsigned int
+AssignSectionAddressAndBankByName(const char *name, unsigned int address, int bank);
+
 #endif
--- a/include/link/mylink.h
+++ b/include/link/mylink.h
@@ -8,8 +8,11 @@
 #include "types.h"

 extern SLONG options;
-#define OPT_SMALL	0x01
+#define OPT_TINY		0x01
 #define OPT_SMART_C_LINK	0x02
+#define OPT_OVERLAY		0x04
+#define OPT_CONTWRAM		0x08
+#define OPT_DMG_MODE		0x10

 enum eRpnData {
 	RPN_ADD = 0,
@@ -42,10 +45,6 @@ enum eRpnData {

 	RPN_HRAM,

-	RPN_PCEZP,
-
-	RPN_RANGECHECK,
-
 	RPN_CONST = 0x80,
 	RPN_SYM = 0x81
 };
@@ -57,14 +56,17 @@ enum eSectionType {
 	SECT_ROM0,
 	SECT_HRAM,
 	SECT_WRAMX,
-	SECT_SRAM
+	SECT_SRAM,
+	SECT_OAM
 };

 struct sSection {
 	SLONG nBank;
 	SLONG nOrg;
+	SLONG nAlign;
 	BBOOL oAssigned;

+	char *pzName;
 	SLONG nByteSize;
 	enum eSectionType Type;
 	UBYTE *pData;
@@ -92,9 +94,7 @@ struct sSymbol {
 enum ePatchType {
 	PATCH_BYTE = 0,
 	PATCH_WORD_L,
-	PATCH_LONG_L,
-	PATCH_WORD_B,
-	PATCH_LONG_B
+	PATCH_LONG_L
 };

 struct sPatch {
--- a/include/link/output.h
+++ b/include/link/output.h
@@ -2,6 +2,7 @@
 #define	RGBDS_LINK_OUTPUT_H

 void out_Setname(char *tzOutputfile);
+void out_SetOverlayname(char *tzOverlayfile);
 void Output(void);

 #endif
--- a/include/link/script.h
+++ b/include/link/script.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef RGBDS_LINK_SCRIPT_H
+#define RGBDS_LINK_SCRIPT_H
+
+#include "extern/stdnoreturn.h"
+
+noreturn void script_fatalerror(const char *fmt, ...);
+
+void script_Parse(const char *path);
+
+void script_IncludeFile(const char *path);
+int script_IncludeDepthGet(void);
+void script_IncludePop(void);
+
+void script_InitSections(void);
+void script_SetCurrentSectionType(const char *type, unsigned int bank);
+void script_SetAddress(unsigned int addr);
+void script_SetAlignment(unsigned int alignment);
+void script_OutputSection(const char *section_name);
+
+#endif
+
--- a/src/asm/asmy.y
+++ b/src/asm/asmy.y
@@ -118,7 +118,6 @@ ULONG	str2int2( char *s, int length )
 		r<<=8;
 		r|=(UBYTE)(s[i]);
 		i++;
-		
 	}
 	return( r );
 }
@@ -460,7 +459,7 @@ void	if_skip_to_endc( void )
 %left	T_OP_MUL T_OP_DIV T_OP_MOD
 %left	T_OP_NOT
 %left	T_OP_DEF
-%left	T_OP_BANK
+%left	T_OP_BANK T_OP_ALIGN
 %left	T_OP_SIN
 %left	T_OP_COS
 %left	T_OP_TAN
@@ -474,6 +473,7 @@ void	if_skip_to_endc( void )
 %left	T_OP_CEIL
 %left	T_OP_FLOOR

+%token	T_OP_HIGH T_OP_LOW

 %left	T_OP_STRCMP
 %left	T_OP_STRIN
@@ -513,13 +513,14 @@ void	if_skip_to_endc( void )
 %token	T_POP_POPO
 %token	T_POP_PUSHO
 %token	T_POP_OPT
-%token	T_SECT_WRAM0 T_SECT_VRAM T_SECT_ROMX T_SECT_ROM0 T_SECT_HRAM T_SECT_WRAMX T_SECT_SRAM
+%token	T_SECT_WRAM0 T_SECT_VRAM T_SECT_ROMX T_SECT_ROM0 T_SECT_HRAM T_SECT_WRAMX T_SECT_SRAM T_SECT_OAM
+%token	T_SECT_HOME T_SECT_DATA T_SECT_CODE T_SECT_BSS

 %token	T_Z80_ADC T_Z80_ADD T_Z80_AND
 %token	T_Z80_BIT
 %token	T_Z80_CALL T_Z80_CCF T_Z80_CP T_Z80_CPL
 %token	T_Z80_DAA T_Z80_DEC T_Z80_DI
-%token	T_Z80_EI T_Z80_EX
+%token	T_Z80_EI
 %token	T_Z80_HALT
 %token	T_Z80_INC
 %token	T_Z80_JP T_Z80_JR
@@ -537,11 +538,12 @@ void	if_skip_to_endc( void )
 %token	T_Z80_SLA T_Z80_SRA T_Z80_SRL T_Z80_SUB T_Z80_SWAP
 %token	T_Z80_XOR

-%token	T_MODE_A T_MODE_B T_MODE_C T_MODE_C_IND T_MODE_D T_MODE_E T_MODE_H T_MODE_L
+%token	T_TOKEN_A T_TOKEN_B T_TOKEN_C T_TOKEN_D T_TOKEN_E T_TOKEN_H T_TOKEN_L
 %token	T_MODE_AF
 %token	T_MODE_BC T_MODE_BC_IND
 %token	T_MODE_DE T_MODE_DE_IND
 %token	T_MODE_SP T_MODE_SP_IND
+%token	T_MODE_C_IND
 %token	T_MODE_HL T_MODE_HL_IND T_MODE_HL_INDDEC T_MODE_HL_INDINC
 %token	T_CC_NZ T_CC_Z T_CC_NC

@@ -679,7 +681,7 @@ fail : T_POP_FAIL string {
 	};

 warn : T_POP_WARN string {
-		yyerror("%s", $2);
+		warning("%s", $2);
 	};

 shift			:	T_POP_SHIFT
@@ -770,7 +772,13 @@ import_list		:	import_list_entry
 				|	import_list_entry ',' import_list
 ;

-import_list_entry	:	T_ID	{ sym_Import($1); }
+import_list_entry	:	T_ID	{
+						/* This is done automatically if
+						 * the label isn't found in the
+						 * list of defined symbols. */
+						if( nPass==1 )
+							warning("IMPORT is a deprecated keyword with no effect: %s", $1);
+					}
 ;

 export			:	T_POP_EXPORT export_list
@@ -992,6 +1000,10 @@ relocconst		:	T_ID
 						{ rpn_UNNEG(&$$,&$2); }
 				|	T_OP_NOT relocconst %prec NEG
 						{ rpn_UNNOT(&$$,&$2); }
+				|	T_OP_HIGH '(' relocconst ')'
+						{ rpn_HIGH(&$$, &$3); }
+				|	T_OP_LOW '(' relocconst ')'
+						{ rpn_LOW(&$$, &$3); }
 				|	T_OP_BANK '(' T_ID ')'
 						{ rpn_Bank(&$$,$3); $$.nVal = 0; }
 				|	T_OP_DEF { oDontExpandStrings = true; } '(' T_ID ')'
@@ -1040,9 +1052,14 @@ const			:	T_ID							{ $$ = sym_GetConstantValue($1); }
 				|	const T_OP_LOGICNE const 		{ $$ = $1 != $3; }
 				|	const T_OP_ADD const			{ $$ = $1 + $3; }
 				|	const T_OP_SUB const			{ $$ = $1 - $3; }
-				|	T_ID  T_OP_SUB T_ID				{ $$ = sym_GetDefinedValue($1) - sym_GetDefinedValue($3); }
+				|	T_ID  T_OP_SUB T_ID
+					{
+						if (sym_IsRelocDiffDefined($1, $3) == 0)
+							fatalerror("'%s - %s' not defined.", $1, $3);
+						$$ = sym_GetDefinedValue($1) - sym_GetDefinedValue($3);
+					}
 				|	const T_OP_XOR const			{ $$ = $1 ^ $3; }
-				|	const T_OP_OR const				{ $$ = $1 | $3; }
+				|	const T_OP_OR const			{ $$ = $1 | $3; }
 				|	const T_OP_AND const			{ $$ = $1 & $3; }
 				|	const T_OP_SHL const			{ $$ = $1 << $3; }
 				|	const T_OP_SHR const			{ $$ = $1 >> $3; }
@@ -1113,6 +1130,10 @@ section:
 			else
 				yyerror("Address $%x not 16-bit", $6);
 		}
+	|	T_POP_SECTION string ',' sectiontype ',' T_OP_ALIGN '[' const ']'
+		{
+			out_NewAlignedSection($2, $4, $8, -1);
+		}
 	|	T_POP_SECTION string ',' sectiontype ',' T_OP_BANK '[' const ']'
 		{
 			bankrangecheck($2, $4, -1, $8);
@@ -1124,6 +1145,14 @@ section:
 			}
 			bankrangecheck($2, $4, $6, $11);
 		}
+	|	T_POP_SECTION string ',' sectiontype ',' T_OP_ALIGN '[' const ']' ',' T_OP_BANK '[' const ']'
+		{
+			out_NewAlignedSection($2, $4, $8, $13);
+		}
+	|	T_POP_SECTION string ',' sectiontype ',' T_OP_BANK '[' const ']' ',' T_OP_ALIGN '[' const ']'
+		{
+			out_NewAlignedSection($2, $4, $13, $8);
+		}
 ;

 sectiontype:
@@ -1134,6 +1163,23 @@ sectiontype:
 	|	T_SECT_HRAM	{ $$=SECT_HRAM; }
 	|	T_SECT_WRAMX	{ $$=SECT_WRAMX; }
 	|	T_SECT_SRAM	{ $$=SECT_SRAM; }
+	|	T_SECT_OAM	{ $$=SECT_OAM; }
+	|	T_SECT_HOME	{
+					warning("HOME section name is deprecated, use ROM0 instead.");
+					$$=SECT_ROM0;
+				}
+	|	T_SECT_DATA	{
+					warning("DATA section name is deprecated, use ROMX instead.");
+					$$=SECT_ROMX;
+				}
+	|	T_SECT_CODE	{
+					warning("CODE section name is deprecated, use ROMX instead.");
+					$$=SECT_ROMX;
+				}
+	|	T_SECT_BSS	{
+					warning("BSS section name is deprecated, use WRAM0 instead.");
+					$$=SECT_WRAM0;
+				}
 ;


@@ -1149,7 +1195,6 @@ cpu_command		:	z80_adc
 				|	z80_dec
 				|	z80_di
 				|	z80_ei
-				|	z80_ex
 				|	z80_halt
 				|	z80_inc
 				|	z80_jp
@@ -1240,12 +1285,6 @@ z80_ei			:	T_Z80_EI
 					{ out_AbsByte(0xFB); }
 ;

-z80_ex			:	T_Z80_EX T_MODE_HL comma T_MODE_SP_IND
-					{ out_AbsByte(0xE3); }
-				|	T_Z80_EX T_MODE_SP_IND comma T_MODE_HL
-					{ out_AbsByte(0xE3); }
-;
-
 z80_halt: T_Z80_HALT
 		{
 			out_AbsByte(0x76);
@@ -1266,7 +1305,11 @@ z80_jp			:	T_Z80_JP const_16bit
 				|	T_Z80_JP ccode comma const_16bit
 					{ out_AbsByte(0xC2|($2<<3)); out_RelWord(&$4); }
 				|	T_Z80_JP T_MODE_HL_IND
-					{ out_AbsByte(0xE9); }
+					{
+						out_AbsByte(0xE9);
+						if( nPass==1 )
+							warning("'JP [HL]' is obsolete, use 'JP HL' instead.");
+					}
 				|	T_Z80_JP T_MODE_HL
 					{ out_AbsByte(0xE9); }
 ;
@@ -1280,7 +1323,11 @@ z80_jr			:	T_Z80_JR const_PCrel
 z80_ldi			:	T_Z80_LDI T_MODE_HL_IND comma T_MODE_A
 					{ out_AbsByte(0x02|(2<<4)); }
 				|	T_Z80_LDI T_MODE_A comma T_MODE_HL
-					{ out_AbsByte(0x0A|(2<<4)); }
+					{
+						out_AbsByte(0x0A|(2<<4));
+						if( nPass==1 )
+							warning("'LDI A,HL' is obsolete, use 'LDI A,[HL]' or 'LD A,[HL+] instead.");
+					}
 				|	T_Z80_LDI T_MODE_A comma T_MODE_HL_IND
 					{ out_AbsByte(0x0A|(2<<4)); }
 ;
@@ -1288,7 +1335,11 @@ z80_ldi			:	T_Z80_LDI T_MODE_HL_IND comma T_MODE_A
 z80_ldd			:	T_Z80_LDD T_MODE_HL_IND comma T_MODE_A
 					{ out_AbsByte(0x02|(3<<4)); }
 				|	T_Z80_LDD T_MODE_A comma T_MODE_HL
-					{ out_AbsByte(0x0A|(3<<4)); }
+					{
+						out_AbsByte(0x0A|(3<<4));
+						if( nPass==1 )
+							warning("'LDD A,HL' is obsolete, use 'LDD A,[HL]' or 'LD A,[HL-] instead.");
+					}
 				|	T_Z80_LDD T_MODE_A comma T_MODE_HL_IND
 					{ out_AbsByte(0x0A|(3<<4)); }
 ;
@@ -1424,8 +1475,14 @@ z80_ld_a		:	T_Z80_LD reg_r comma T_MODE_C_IND
 					}
 ;

-z80_ld_ss		:	T_Z80_LD reg_ss comma const_16bit
-					{ out_AbsByte(0x01|($2<<4)); out_RelWord(&$4); }
+z80_ld_ss		:	T_Z80_LD T_MODE_BC comma const_16bit
+					{ out_AbsByte(0x01|(REG_BC<<4)); out_RelWord(&$4); }
+				|	T_Z80_LD T_MODE_DE comma const_16bit
+					{ out_AbsByte(0x01|(REG_DE<<4)); out_RelWord(&$4); }
+				/*
+				 * HL is taken care of in z80_ld_hl
+				 * SP is taken care of in z80_ld_sp
+				 */
 ;

 z80_nop			:	T_Z80_NOP
@@ -1565,10 +1622,33 @@ op_a_n			:	const_8bit				{ $$ = $1; }
 comma			:	','
 ;

+T_MODE_A		:	T_TOKEN_A
+				|	T_OP_HIGH '(' T_MODE_AF ')'
+;
+T_MODE_B		:	T_TOKEN_B
+				|	T_OP_HIGH '(' T_MODE_BC ')'
+;
+T_MODE_C		:	T_TOKEN_C
+				|	T_OP_LOW '(' T_MODE_BC ')'
+;
+T_MODE_D		:	T_TOKEN_D
+				|	T_OP_HIGH '(' T_MODE_DE ')'
+;
+T_MODE_E		:	T_TOKEN_E
+				|	T_OP_LOW '(' T_MODE_DE ')'
+;
+T_MODE_H		:	T_TOKEN_H
+				|	T_OP_HIGH '(' T_MODE_HL ')'
+;
+T_MODE_L		:	T_TOKEN_L
+				|	T_OP_LOW '(' T_MODE_HL ')'
+;
+
+
 ccode			:	T_CC_NZ		{ $$ = CC_NZ; }
 				|	T_CC_Z		{ $$ = CC_Z; }
 				|	T_CC_NC		{ $$ = CC_NC; }
-				|	T_MODE_C	{ $$ = CC_C; }
+				|	T_TOKEN_C	{ $$ = CC_C; }
 ;

 reg_r			:	T_MODE_B		{ $$ = REG_B; }
--- a/src/asm/charmap.c
+++ b/src/asm/charmap.c
@@ -107,7 +107,8 @@ readUTF8Char(char *dest, char *src)
 int
 charmap_Add(char *input, UBYTE output)
 {
-	int i, input_length;
+	int i;
+	size_t input_length;
 	char temp1i[CHARMAPLENGTH + 1], temp2i[CHARMAPLENGTH + 1], temp1o = 0,
 	    temp2o = 0;

--- a/src/asm/fstack.c
+++ b/src/asm/fstack.c
@@ -47,7 +47,7 @@ ULONG ulMacroReturnValue;
 /*
 * Context push and pop
 */
-void 
+void
 pushcontext(void)
 {
 	struct sContext **ppFileStack;
@@ -84,7 +84,7 @@ pushcontext(void)
 		fatalerror("No memory for context");
 }

-int 
+int
 popcontext(void)
 {
 	struct sContext *pLastFile, **ppLastFile;
@@ -148,7 +148,7 @@ popcontext(void)
 		return (1);
 }

-int 
+int
 yywrap(void)
 {
 	return (popcontext());
@@ -157,7 +157,7 @@ yywrap(void)
 /*
 * Dump the context stack to stderr
 */
-void 
+void
 fstk_Dump(void)
 {
 	struct sContext *pLastFile;
@@ -176,7 +176,7 @@ fstk_Dump(void)
 /*
 * Extra includepath stuff
 */
-void 
+void
 fstk_AddIncludePath(char *s)
 {
 	if (NextIncPath == MAXINCPATHS) {
@@ -202,7 +202,7 @@ fstk_FindFile(char *fname)
 	}

 	for (i = 0; i < NextIncPath; ++i) {
-		if (strlcpy(path, IncludePaths[i], sizeof path) >= 
+		if (strlcpy(path, IncludePaths[i], sizeof path) >=
 		    sizeof path) {
 			continue;
 		}
@@ -251,7 +251,7 @@ fstk_RunInclude(char *tzFileName)
 /*
 * Set up a macro for parsing
 */
-ULONG 
+ULONG
 fstk_RunMacro(char *s)
 {
 	struct sSymbol *sym;
@@ -278,7 +278,7 @@ fstk_RunMacro(char *s)
 /*
 * Set up a macroargument for parsing
 */
-void 
+void
 fstk_RunMacroArg(SLONG s)
 {
 	char *sym;
@@ -301,7 +301,7 @@ fstk_RunMacroArg(SLONG s)
 /*
 * Set up a stringequate for parsing
 */
-void 
+void
 fstk_RunString(char *s)
 {
 	struct sSymbol *pSym;
@@ -320,7 +320,7 @@ fstk_RunString(char *s)
 /*
 * Set up a repeat block for parsing
 */
-void 
+void
 fstk_RunRept(ULONG count)
 {
 	if (count) {
@@ -346,7 +346,9 @@ fstk_Init(char *s)
 {
 	char tzFileName[_MAX_PATH + 1];

-	sym_AddString("__FILE__", s);
+	char tzSymFileName[_MAX_PATH + 1 + 2];
+	snprintf(tzSymFileName, sizeof(tzSymFileName), "\"%s\"", s);
+	sym_AddString("__FILE__", tzSymFileName);

 	strcpy(tzFileName, s);
 	pFileStack = NULL;
--- a/src/asm/globlex.c
+++ b/src/asm/globlex.c
@@ -17,7 +17,7 @@ bool oDontExpandStrings = false;
 SLONG nGBGfxID = -1;
 SLONG nBinaryID = -1;

-SLONG 
+SLONG
 gbgfx2bin(char ch)
 {
 	SLONG i;
@@ -31,7 +31,7 @@ gbgfx2bin(char ch)
 	return (0);
 }

-SLONG 
+SLONG
 binary2bin(char ch)
 {
 	SLONG i;
@@ -45,7 +45,7 @@ binary2bin(char ch)
 	return (0);
 }

-SLONG 
+SLONG
 char2bin(char ch)
 {
 	if (ch >= 'a' && ch <= 'f')
@@ -62,7 +62,7 @@ char2bin(char ch)

 typedef SLONG(*x2bin) (char ch);

-SLONG 
+SLONG
 ascii2bin(char *s)
 {
 	SLONG radix = 10;
@@ -107,7 +107,7 @@ ascii2bin(char *s)
 	return (result);
 }

-ULONG 
+ULONG
 ParseFixedPoint(char *s, ULONG size)
 {
 	//char dest[256];
@@ -133,7 +133,7 @@ ParseFixedPoint(char *s, ULONG size)
 	return (1);
 }

-ULONG 
+ULONG
 ParseNumber(char *s, ULONG size)
 {
 	char dest[256];
@@ -145,7 +145,7 @@ ParseNumber(char *s, ULONG size)
 	return (1);
 }

-ULONG 
+ULONG
 ParseSymbol(char *src, ULONG size)
 {
 	char dest[MAXSYMLEN + 1];
@@ -203,7 +203,7 @@ ParseSymbol(char *src, ULONG size)
 	}
 }

-ULONG 
+ULONG
 PutMacroArg(char *src, ULONG size)
 {
 	char *s;
@@ -221,7 +221,7 @@ PutMacroArg(char *src, ULONG size)
 	return (0);
 }

-ULONG 
+ULONG
 PutUniqueArg(char *src, ULONG size)
 {
 	char *s;
@@ -267,6 +267,7 @@ struct sLexInitString staticstrings[] = {
 	{"def", T_OP_DEF},

 	{"bank", T_OP_BANK},
+	{"align", T_OP_ALIGN},

 	{"round", T_OP_ROUND},
 	{"ceil", T_OP_CEIL},
@@ -281,6 +282,9 @@ struct sLexInitString staticstrings[] = {
 	{"atan", T_OP_ATAN},
 	{"atan2", T_OP_ATAN2},

+	{"high", T_OP_HIGH},
+	{"low", T_OP_LOW},
+
 	{"strcmp", T_OP_STRCMP},
 	{"strin", T_OP_STRIN},
 	{"strsub", T_OP_STRSUB},
@@ -301,9 +305,6 @@ struct sLexInitString staticstrings[] = {
 	{"ds", T_POP_DS},
 	{NAME_DB, T_POP_DB},
 	{NAME_DW, T_POP_DW},
-#ifdef NAME_DL
-	{NAME_DL, T_POP_DL},
-#endif
 	{"section", T_POP_SECTION},
 	{"purge", T_POP_PURGE},

@@ -331,22 +332,22 @@ struct sLexInitString staticstrings[] = {
 	{"endc", T_POP_ENDC},

 	{"wram0", T_SECT_WRAM0},
-	{"bss", T_SECT_WRAM0}, /* deprecated */
 	{"vram", T_SECT_VRAM},
-	{"code", T_SECT_ROMX}, /* deprecated */
-	{"data", T_SECT_ROMX}, /* deprecated */
 	{"romx", T_SECT_ROMX},
-	{"home", T_SECT_ROM0}, /* deprecated */
 	{"rom0", T_SECT_ROM0},
 	{"hram", T_SECT_HRAM},
 	{"wramx", T_SECT_WRAMX},
 	{"sram", T_SECT_SRAM},
+	{"oam", T_SECT_OAM},
+
+	/* Deprecated section type names */
+	{"home", T_SECT_HOME},
+	{"code", T_SECT_CODE},
+	{"data", T_SECT_DATA},
+	{"bss", T_SECT_BSS},

 	{NAME_RB, T_POP_RB},
 	{NAME_RW, T_POP_RW},
-#ifdef NAME_RL
-	{NAME_RL, T_POP_RL},
-#endif
 	{"equ", T_POP_EQU},
 	{"equs", T_POP_EQUS},

@@ -388,7 +389,7 @@ struct sLexFloat tMacroUniqueToken = {
 	T_LEX_MACROUNIQUE
 };

-void 
+void
 setuplex(void)
 {
 	ULONG id;
--- a/src/asm/lexer.c
+++ b/src/asm/lexer.c
@@ -39,7 +39,7 @@ ULONG tFloatingChars[256];
 ULONG nFloating;
 enum eLexerState lexerstate = LEX_STATE_NORMAL;

-void 
+void
 upperstring(char *s)
 {
 	while (*s) {
@@ -48,7 +48,7 @@ upperstring(char *s)
 	}
 }

-void 
+void
 lowerstring(char *s)
 {
 	while (*s) {
@@ -57,19 +57,19 @@ lowerstring(char *s)
 	}
 }

-void 
+void
 yyskipbytes(ULONG count)
 {
 	pLexBuffer += count;
 }

-void 
+void
 yyunputbytes(ULONG count)
 {
 	pLexBuffer -= count;
 }

-void 
+void
 yyunput(char c)
 {
 	if (pLexBuffer <= pLexBufferRealStart)
@@ -78,7 +78,7 @@ yyunput(char c)
 	*(--pLexBuffer) = c;
 }

-void 
+void
 yyunputstr(char *s)
 {
 	int i, len;
@@ -92,26 +92,26 @@ yyunputstr(char *s)
 		*(--pLexBuffer) = s[i];
 }

-void 
+void
 yy_switch_to_buffer(YY_BUFFER_STATE buf)
 {
 	pCurrentBuffer = buf;
 }

-void 
+void
 yy_set_state(enum eLexerState i)
 {
 	lexerstate = i;
 }

-void 
+void
 yy_delete_buffer(YY_BUFFER_STATE buf)
 {
 	free(buf->pBufferStart - SAFETYMARGIN);
 	free(buf);
 }

-YY_BUFFER_STATE 
+YY_BUFFER_STATE
 yy_scan_bytes(char *mem, ULONG size)
 {
 	YY_BUFFER_STATE pBuffer;
@@ -132,7 +132,7 @@ yy_scan_bytes(char *mem, ULONG size)
 	return (NULL);
 }

-YY_BUFFER_STATE 
+YY_BUFFER_STATE
 yy_create_buffer(FILE * f)
 {
 	YY_BUFFER_STATE pBuffer;
@@ -219,7 +219,7 @@ lex_CheckCharacterRange(UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatDeleteRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -230,7 +230,7 @@ lex_FloatDeleteRange(ULONG id, UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatAddRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -241,7 +241,7 @@ lex_FloatAddRange(ULONG id, UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatDeleteFirstRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -252,7 +252,7 @@ lex_FloatDeleteFirstRange(ULONG id, UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatAddFirstRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -263,7 +263,7 @@ lex_FloatAddFirstRange(ULONG id, UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatDeleteSecondRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -274,7 +274,7 @@ lex_FloatDeleteSecondRange(ULONG id, UWORD start, UWORD end)
 	}
 }

-void 
+void
 lex_FloatAddSecondRange(ULONG id, UWORD start, UWORD end)
 {
 	lex_CheckCharacterRange(start, end);
@@ -302,7 +302,7 @@ lexgetfloat(ULONG nFloatMask)
 	return (&tLexFloat[i]);
 }

-ULONG 
+ULONG
 lexcalchash(char *s)
 {
 	ULONG hash = 0;
@@ -314,7 +314,7 @@ lexcalchash(char *s)
 	return (hash % LEXHASHSIZE);
 }

-void 
+void
 lex_Init(void)
 {
 	ULONG i;
@@ -333,7 +333,7 @@ lex_Init(void)
 	nFloating = 0;
 }

-void 
+void
 lex_AddStrings(struct sLexInitString * lex)
 {
 	while (lex->tzName) {
@@ -435,10 +435,10 @@ yylex_GetLongestFixed()
 size_t
 CopyMacroArg(char *dest, size_t maxLength, char c)
 {
-	int i;
+	size_t i;
 	char *s;
 	int argNum;
-	
+
 	switch (c) {
 	case '1':
 	case '2':
@@ -565,6 +565,15 @@ yylex_ReadQuotedString()
 			case '"':
 				ch = '"';
 				break;
+			case ',':
+				ch = ',';
+				break;
+			case '{':
+				ch = '{';
+				break;
+			case '}':
+				ch = '}';
+				break;
 			default:
 				maxLength = MAXSTRLEN - index;
 				length = CopyMacroArg(&yylval.tzString[index], maxLength, ch);
@@ -698,6 +707,15 @@ yylex_MACROARGS()
 			case '\\':
 				ch = '\\';
 				break;
+			case ',':
+				ch = ',';
+				break;
+			case '{':
+				ch = '{';
+				break;
+			case '}':
+				ch = '}';
+				break;
 			default:
 				maxLength = MAXSTRLEN - index;
 				length = CopyMacroArg(&yylval.tzString[index], maxLength, ch);
@@ -706,7 +724,7 @@ yylex_MACROARGS()
 					index += length;
 				else
 					fatalerror("Illegal character escape '%c'", ch);
-				
+
 				ch = 0;
 				break;
 			}
@@ -739,7 +757,7 @@ yylex_MACROARGS()
 	return 0;
 }

-ULONG 
+ULONG
 yylex(void)
 {
 	switch (lexerstate) {
--- a/src/asm/locallex.c
+++ b/src/asm/locallex.c
@@ -17,7 +17,6 @@ struct sLexInitString localstrings[] = {
 	{"dec", T_Z80_DEC},
 	{"di", T_Z80_DI},
 	{"ei", T_Z80_EI},
-	{"ex", T_Z80_EX},
 	{"halt", T_Z80_HALT},
 	{"inc", T_Z80_INC},
 	{"jp", T_Z80_JP},
@@ -60,30 +59,31 @@ struct sLexInitString localstrings[] = {
 	{"nz", T_CC_NZ},
 	{"z", T_CC_Z},
 	{"nc", T_CC_NC},
-	/* { "c", T_MODE_C }, */
+	/* { "c", T_TOKEN_C }, */

+	{"[bc]", T_MODE_BC_IND},
+	{"[de]", T_MODE_DE_IND},
 	{"[hl]", T_MODE_HL_IND},
 	{"[hl+]", T_MODE_HL_INDINC},
 	{"[hl-]", T_MODE_HL_INDDEC},
 	{"[hli]", T_MODE_HL_INDINC},
 	{"[hld]", T_MODE_HL_INDDEC},
-	{"hl", T_MODE_HL},
-	{"af", T_MODE_AF},
-	{"[bc]", T_MODE_BC_IND},
-	{"bc", T_MODE_BC},
-	{"[de]", T_MODE_DE_IND},
-	{"de", T_MODE_DE},
 	{"[sp]", T_MODE_SP_IND},
+	{"af", T_MODE_AF},
+	{"bc", T_MODE_BC},
+	{"de", T_MODE_DE},
+	{"hl", T_MODE_HL},
 	{"sp", T_MODE_SP},
-	{"a", T_MODE_A},
-	{"b", T_MODE_B},
-	{"[$ff00+c]", T_MODE_C_IND},
 	{"[c]", T_MODE_C_IND},
-	{"c", T_MODE_C},
-	{"d", T_MODE_D},
-	{"e", T_MODE_E},
-	{"h", T_MODE_H},
-	{"l", T_MODE_L},
+	{"[$ff00+c]", T_MODE_C_IND},
+
+	{"a", T_TOKEN_A},
+	{"b", T_TOKEN_B},
+	{"c", T_TOKEN_C},
+	{"d", T_TOKEN_D},
+	{"e", T_TOKEN_E},
+	{"h", T_TOKEN_H},
+	{"l", T_TOKEN_L},

 	{NULL, 0}
 };
--- a/src/asm/main.c
+++ b/src/asm/main.c
@@ -20,8 +20,6 @@ int cldefines_index;
 int cldefines_size;
 char **cldefines;

-char *progname;
-
 clock_t nStartClock, nEndClock;
 SLONG nLineNo;
 ULONG nTotalLines, nPass, nPC, nIFDepth, nErrors;
@@ -42,7 +40,7 @@ struct sOptionStackEntry {

 struct sOptionStackEntry *pOptionStack = NULL;

-void 
+void
 opt_SetCurrentOptions(struct sOptions * pOpt)
 {
 	if (nGBGfxID != -1) {
@@ -105,7 +103,7 @@ opt_SetCurrentOptions(struct sOptions * pOpt)
 	}
 }

-void 
+void
 opt_Parse(char *s)
 {
 	struct sOptions newopt;
@@ -154,7 +152,7 @@ opt_Parse(char *s)
 	opt_SetCurrentOptions(&newopt);
 }

-void 
+void
 opt_Push(void)
 {
 	struct sOptionStackEntry *pOpt;
@@ -167,7 +165,7 @@ opt_Push(void)
 		fatalerror("No memory for option stack");
 }

-void 
+void
 opt_Pop(void)
 {
 	if (pOptionStack) {
@@ -226,15 +224,15 @@ opt_ParseDefines()
 void
 verror(const char *fmt, va_list args)
 {
-	fprintf(stderr, "ERROR:\t");
+	fprintf(stderr, "ERROR: ");
 	fstk_Dump();
-	fprintf(stderr, " :\n\t");
+	fprintf(stderr, ":\n\t");
 	vfprintf(stderr, fmt, args);
 	fprintf(stderr, "\n");
 	nErrors += 1;
 }

-void 
+void
 yyerror(const char *fmt, ...)
 {
 	va_list args;
@@ -243,7 +241,7 @@ yyerror(const char *fmt, ...)
 	va_end(args);
 }

-void 
+void
 fatalerror(const char *fmt, ...)
 {
 	va_list args;
@@ -253,7 +251,25 @@ fatalerror(const char *fmt, ...)
 	exit(5);
 }

-static void 
+void
+warning(const char *fmt, ...)
+{
+	if (!CurrentOptions.warnings)
+		return;
+
+	va_list args;
+	va_start(args, fmt);
+
+	fprintf(stderr, "warning: ");
+	fstk_Dump();
+	fprintf(stderr, ":\n\t");
+	vfprintf(stderr, fmt, args);
+	fprintf(stderr, "\n");
+
+	va_end(args);
+}
+
+static void
 usage(void)
 {
 	printf(
@@ -262,7 +278,7 @@ usage(void)
 	exit(1);
 }

-int 
+int
 main(int argc, char *argv[])
 {
 	int ch;
@@ -283,8 +299,6 @@ main(int argc, char *argv[])
 	if (argc == 1)
 		usage();

-	progname = argv[0];
-
 	/* yydebug=1; */

 	DefaultOptions.gbgfx[0] = '0';
@@ -297,12 +311,13 @@ main(int argc, char *argv[])
 	DefaultOptions.verbose = false;
 	DefaultOptions.haltnop = true;
 	DefaultOptions.exportall = false;
+	DefaultOptions.warnings = true;

 	opt_SetCurrentOptions(&DefaultOptions);

 	newopt = CurrentOptions;

-	while ((ch = getopt(argc, argv, "b:D:g:hi:o:p:vE")) != -1) {
+	while ((ch = getopt(argc, argv, "b:D:g:hi:o:p:vEw")) != -1) {
 		switch (ch) {
 		case 'b':
 			if (strlen(optarg) == 2) {
@@ -352,6 +367,9 @@ main(int argc, char *argv[])
 		case 'E':
 			newopt.exportall = true;
 			break;
+		case 'w':
+			newopt.warnings = false;
+			break;
 		default:
 			usage();
 		}
--- a/src/asm/math.c
+++ b/src/asm/math.c
@@ -18,7 +18,7 @@
 /*
 * Define the _PI symbol
 */
-void 
+void
 math_DefinePI(void)
 {
 	sym_AddEqu("_PI", double2fix(PI));
@@ -27,7 +27,7 @@ math_DefinePI(void)
 /*
 * Print a fixed point value
 */
-void 
+void
 math_Print(SLONG i)
 {
 	if (i >= 0)
@@ -41,7 +41,7 @@ math_Print(SLONG i)
 /*
 * Calculate sine
 */
-SLONG 
+SLONG
 math_Sin(SLONG i)
 {
 	return (double2fix(sin(fix2double(i) * 2 * PI / 65536)));
@@ -50,7 +50,7 @@ math_Sin(SLONG i)
 /*
 * Calculate cosine
 */
-SLONG 
+SLONG
 math_Cos(SLONG i)
 {
 	return (double2fix(cos(fix2double(i) * 2 * PI / 65536)));
@@ -59,7 +59,7 @@ math_Cos(SLONG i)
 /*
 * Calculate tangent
 */
-SLONG 
+SLONG
 math_Tan(SLONG i)
 {
 	return (double2fix(tan(fix2double(i) * 2 * PI / 65536)));
@@ -68,7 +68,7 @@ math_Tan(SLONG i)
 /*
 * Calculate arcsine
 */
-SLONG 
+SLONG
 math_ASin(SLONG i)
 {
 	return (double2fix(asin(fix2double(i)) / 2 / PI * 65536));
@@ -77,7 +77,7 @@ math_ASin(SLONG i)
 /*
 * Calculate arccosine
 */
-SLONG 
+SLONG
 math_ACos(SLONG i)
 {
 	return (double2fix(acos(fix2double(i)) / 2 / PI * 65536));
@@ -86,7 +86,7 @@ math_ACos(SLONG i)
 /*
 * Calculate arctangent
 */
-SLONG 
+SLONG
 math_ATan(SLONG i)
 {
 	return (double2fix(atan(fix2double(i)) / 2 / PI * 65536));
@@ -95,7 +95,7 @@ math_ATan(SLONG i)
 /*
 * Calculate atan2
 */
-SLONG 
+SLONG
 math_ATan2(SLONG i, SLONG j)
 {
 	return (double2fix
@@ -105,7 +105,7 @@ math_ATan2(SLONG i, SLONG j)
 /*
 * Multiplication
 */
-SLONG 
+SLONG
 math_Mul(SLONG i, SLONG j)
 {
 	return (double2fix(fix2double(i) * fix2double(j)));
@@ -114,7 +114,7 @@ math_Mul(SLONG i, SLONG j)
 /*
 * Division
 */
-SLONG 
+SLONG
 math_Div(SLONG i, SLONG j)
 {
 	return (double2fix(fix2double(i) / fix2double(j)));
@@ -123,7 +123,7 @@ math_Div(SLONG i, SLONG j)
 /*
 * Round
 */
-SLONG 
+SLONG
 math_Round(SLONG i)
 {
 	return double2fix(round(fix2double(i)));
@@ -132,7 +132,7 @@ math_Round(SLONG i)
 /*
 * Ceil
 */
-SLONG 
+SLONG
 math_Ceil(SLONG i)
 {
 	return double2fix(ceil(fix2double(i)));
@@ -141,7 +141,7 @@ math_Ceil(SLONG i)
 /*
 * Floor
 */
-SLONG 
+SLONG
 math_Floor(SLONG i)
 {
 	return double2fix(floor(fix2double(i)));
--- a/src/asm/output.c
+++ b/src/asm/output.c
@@ -53,7 +53,7 @@ struct SectionStackEntry *pSectionStack = NULL;
 /*
 * Section stack routines
 */
-void 
+void
 out_PushSection(void)
 {
 	struct SectionStackEntry *pSect;
@@ -66,7 +66,7 @@ out_PushSection(void)
 		fatalerror("No memory for section stack");
 }

-void 
+void
 out_PopSection(void)
 {
 	if (pSectionStack) {
@@ -83,7 +83,7 @@ out_PopSection(void)
 /*
 * Count the number of symbols used in this object
 */
-ULONG 
+ULONG
 countsymbols(void)
 {
 	struct PatchSymbol *pSym;
@@ -102,7 +102,7 @@ countsymbols(void)
 /*
 * Count the number of sections used in this object
 */
-ULONG 
+ULONG
 countsections(void)
 {
 	struct Section *pSect;
@@ -121,7 +121,7 @@ countsections(void)
 /*
 * Count the number of patches used in this object
 */
-ULONG 
+ULONG
 countpatches(struct Section * pSect)
 {
 	struct Patch *pPatch;
@@ -139,7 +139,7 @@ countpatches(struct Section * pSect)
 /*
 * Write a long to a file (little-endian)
 */
-void 
+void
 fputlong(ULONG i, FILE * f)
 {
 	fputc(i, f);
@@ -151,7 +151,7 @@ fputlong(ULONG i, FILE * f)
 /*
 * Write a NULL-terminated string to a file
 */
-void 
+void
 fputstring(char *s, FILE * f)
 {
 	while (*s)
@@ -162,7 +162,7 @@ fputstring(char *s, FILE * f)
 /*
 * Return a section's ID
 */
-ULONG 
+ULONG
 getsectid(struct Section * pSect)
 {
 	struct Section *sec;
@@ -184,7 +184,7 @@ getsectid(struct Section * pSect)
 /*
 * Write a patch to a file
 */
-void 
+void
 writepatch(struct Patch * pPatch, FILE * f)
 {
 	fputstring(pPatch->tzFilename, f);
@@ -198,20 +198,20 @@ writepatch(struct Patch * pPatch, FILE * f)
 /*
 * Write a section to a file
 */
-void 
+void
 writesection(struct Section * pSect, FILE * f)
 {
-	//printf("SECTION: %s, ID: %d\n", pSect->pzName, getsectid(pSect));
+	fputstring(pSect->pzName, f);

 	fputlong(pSect->nPC, f);
+
 	fputc(pSect->nType, f);
+
 	fputlong(pSect->nOrg, f);
-	//RGB1 addition
+	fputlong(pSect->nBank, f);
+	fputlong(pSect->nAlign, f);

-	    fputlong(pSect->nBank, f);
-	//RGB1 addition
-
-	    if ((pSect->nType == SECT_ROM0)
+	if ((pSect->nType == SECT_ROM0)
 	    || (pSect->nType == SECT_ROMX)) {
 		struct Patch *pPatch;

@@ -229,7 +229,7 @@ writesection(struct Section * pSect, FILE * f)
 /*
 * Write a symbol to a file
 */
-void 
+void
 writesymbol(struct sSymbol * pSym, FILE * f)
 {
 	char symname[MAXSYMLEN * 2 + 1];
@@ -249,7 +249,7 @@ writesymbol(struct sSymbol * pSym, FILE * f)
 			strcat(symname, pSym->tzName);
 		} else
 			strcpy(symname, pSym->tzName);
-		
+
 		if (pSym->nType & SYMF_EXPORT) {
 			/* Symbol should be exported */
 			type = SYM_EXPORT;
@@ -278,13 +278,12 @@ writesymbol(struct sSymbol * pSym, FILE * f)
 /*
 * Add a symbol to the object
 */
-ULONG 
+ULONG
 addsymbol(struct sSymbol * pSym)
 {
 	struct PatchSymbol *pPSym, **ppPSym;
 	static ULONG nextID = 0;
 	ULONG hash;
-	

 	hash = calchash(pSym->tzName);
 	ppPSym = &(tHashedPatchSymbols[hash]);
@@ -312,7 +311,7 @@ addsymbol(struct sSymbol * pSym)
 /*
 * Add all exported symbols to the object
 */
-void 
+void
 addexports(void)
 {
 	int i;
@@ -352,7 +351,7 @@ allocpatch(void)
 /*
 * Create a new patch (includes the rpn expr)
 */
-void 
+void
 createpatch(ULONG type, struct Expression * expr)
 {
 	struct Patch *pPatch;
@@ -428,7 +427,7 @@ createpatch(ULONG type, struct Expression * expr)
 /*
 * A quick check to see if we have an initialized section
 */
-void 
+void
 checksection(void)
 {
 	if (pCurrentSection)
@@ -441,7 +440,7 @@ checksection(void)
 * A quick check to see if we have an initialized section that can contain
 * this much initialized data
 */
-void 
+void
 checkcodesection(SLONG size)
 {
 	checksection();
@@ -479,7 +478,7 @@ checkcodesection(SLONG size)
 /*
 * Write an objectfile
 */
-void 
+void
 out_WriteObject(void)
 {
 	FILE *f;
@@ -490,7 +489,7 @@ out_WriteObject(void)
 		struct PatchSymbol *pSym;
 		struct Section *pSect;

-		fwrite("RGB2", 1, 4, f);
+		fwrite("RGB4", 1, 4, f);
 		fputlong(countsymbols(), f);
 		fputlong(countsections(), f);

@@ -513,7 +512,7 @@ out_WriteObject(void)
 /*
 * Prepare for pass #2
 */
-void 
+void
 out_PrepPass2(void)
 {
 	struct Section *pSect;
@@ -530,7 +529,7 @@ out_PrepPass2(void)
 /*
 * Set the objectfilename
 */
-void 
+void
 out_SetFileName(char *s)
 {
 	tzObjectname = s;
@@ -546,7 +545,7 @@ out_SetFileName(char *s)
 * Find a section by name and type.  If it doesn't exist, create it
 */
 struct Section *
-out_FindSection(char *pzName, ULONG secttype, SLONG org, SLONG bank)
+out_FindSection(char *pzName, ULONG secttype, SLONG org, SLONG bank, SLONG alignment)
 {
 	struct Section *pSect, **ppSect;

@@ -557,7 +556,8 @@ out_FindSection(char *pzName, ULONG secttype, SLONG org, SLONG bank)
 		if (strcmp(pzName, pSect->pzName) == 0) {
 			if (secttype == pSect->nType
 			    && ((ULONG) org) == pSect->nOrg
-			    && ((ULONG) bank) == pSect->nBank) {
+			    && ((ULONG) bank) == pSect->nBank
+			    && ((ULONG) alignment == pSect->nAlign)) {
 				return (pSect);
 			} else
 				fatalerror
@@ -574,6 +574,7 @@ out_FindSection(char *pzName, ULONG secttype, SLONG org, SLONG bank)
 			pSect->nPC = 0;
 			pSect->nOrg = org;
 			pSect->nBank = bank;
+			pSect->nAlign = alignment;
 			pSect->pNext = NULL;
 			pSect->pPatches = NULL;
 			pSect->charmap = NULL;
@@ -594,7 +595,7 @@ out_FindSection(char *pzName, ULONG secttype, SLONG org, SLONG bank)
 /*
 * Set the current section
 */
-void 
+void
 out_SetCurrentSection(struct Section * pSect)
 {
 	pCurrentSection = pSect;
@@ -607,25 +608,37 @@ out_SetCurrentSection(struct Section * pSect)
 /*
 * Set the current section by name and type
 */
-void 
+void
 out_NewSection(char *pzName, ULONG secttype)
 {
-	out_SetCurrentSection(out_FindSection(pzName, secttype, -1, -1));
+	out_SetCurrentSection(out_FindSection(pzName, secttype, -1, -1, 1));
 }

 /*
 * Set the current section by name and type
 */
-void 
+void
 out_NewAbsSection(char *pzName, ULONG secttype, SLONG org, SLONG bank)
 {
-	out_SetCurrentSection(out_FindSection(pzName, secttype, org, bank));
+	out_SetCurrentSection(out_FindSection(pzName, secttype, org, bank, 1));
+}
+
+/*
+ * Set the current section by name and type, using a given byte alignment
+ */
+void
+out_NewAlignedSection(char *pzName, ULONG secttype, SLONG alignment, SLONG bank)
+{
+	if (alignment < 0 || alignment > 16) {
+		yyerror("Alignment must be between 0-16 bits.");
+	}
+	out_SetCurrentSection(out_FindSection(pzName, secttype, -1, bank, 1 << alignment));
 }

 /*
 * Output an absolute byte
 */
-void 
+void
 out_AbsByte(int b)
 {
 	checkcodesection(1);
@@ -638,7 +651,7 @@ out_AbsByte(int b)
 	pPCSymbol->nValue += 1;
 }

-void 
+void
 out_AbsByteGroup(char *s, int length)
 {
 	checkcodesection(length);
@@ -649,7 +662,7 @@ out_AbsByteGroup(char *s, int length)
 /*
 * Skip this many bytes
 */
-void 
+void
 out_Skip(int skip)
 {
 	checksection();
@@ -668,7 +681,7 @@ out_Skip(int skip)
 /*
 * Output a NULL terminated string (excluding the NULL-character)
 */
-void 
+void
 out_String(char *s)
 {
 	checkcodesection(strlen(s));
@@ -681,7 +694,7 @@ out_String(char *s)
 * is an absolute value in disguise.
 */

-void 
+void
 out_RelByte(struct Expression * expr)
 {
 	checkcodesection(1);
@@ -702,7 +715,7 @@ out_RelByte(struct Expression * expr)
 /*
 * Output an absolute word
 */
-void 
+void
 out_AbsWord(int b)
 {
 	checkcodesection(2);
@@ -720,7 +733,7 @@ out_AbsWord(int b)
 * Output a relocatable word.  Checking will be done to see if
 * it's an absolute value in disguise.
 */
-void 
+void
 out_RelWord(struct Expression * expr)
 {
 	ULONG b;
@@ -744,7 +757,7 @@ out_RelWord(struct Expression * expr)
 /*
 * Output an absolute longword
 */
-void 
+void
 out_AbsLong(SLONG b)
 {
 	checkcodesection(sizeof(SLONG));
@@ -763,7 +776,7 @@ out_AbsLong(SLONG b)
 * Output a relocatable longword.  Checking will be done to see if
 * is an absolute value in disguise.
 */
-void 
+void
 out_RelLong(struct Expression * expr)
 {
 	SLONG b;
@@ -789,7 +802,7 @@ out_RelLong(struct Expression * expr)
 /*
 * Output a PC-relative byte
 */
-void 
+void
 out_PCRelByte(struct Expression * expr)
 {
 	SLONG b = expr->nVal;
@@ -806,7 +819,7 @@ out_PCRelByte(struct Expression * expr)
 /*
 * Output a binary file
 */
-void 
+void
 out_BinaryFile(char *s)
 {
 	FILE *f;
@@ -837,7 +850,7 @@ out_BinaryFile(char *s)
 	fclose(f);
 }

-void 
+void
 out_BinaryFileSlice(char *s, SLONG start_pos, SLONG length)
 {
 	FILE *f;
--- a/src/asm/rgbasm.1
+++ b/src/asm/rgbasm.1
@@ -1,4 +1,18 @@
-.Dd February 26, 2015
+.\" Copyright © 2010 Anthony J. Bentley <anthony@anjbe.name>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 17, 2017
 .Dt RGBASM 1
 .Os RGBDS Manual
 .Sh NAME
@@ -6,7 +20,7 @@
 .Nd Game Boy assembler
 .Sh SYNOPSIS
 .Nm rgbasm
-.Op Fl Ehv
+.Op Fl Ehvw
 .Op Fl b Ar chars
 .Op Fl D Ar name Ns Op = Ns Ar value
 .Op Fl g Ar chars
@@ -54,6 +68,8 @@ When padding an image, pad with this value.
 The default is 0x00.
 .It Fl v
 Be verbose.
+.It Fl w
+Disable warning output.
 .El
 .Sh EXAMPLES
 Assembling a basic source file is simple:
@@ -66,12 +82,16 @@ run through
 and
 .Xr rgbfix 1 .
 .Sh SEE ALSO
+.Xr rgbasm 5 ,
 .Xr rgbfix 1 ,
 .Xr rgblink 1 ,
-.Xr rgbds 7
+.Xr rgbds 5 ,
+.Xr rgbds 7 ,
+.Xr gbz80 7
 .Pp
 .Lk https://rednex.github.io/rgbds/asm.htm rgbasm assembly commands
 .Sh HISTORY
 .Nm
 was originally written by Carsten S\(/orensen as part of the ASMotor package,
-and was later packaged in RGBDS by Justin Lloyd.
+and was later packaged in RGBDS by Justin Lloyd. It is now maintained by a
+number of contributors at https://github.com/rednex/rgbds.
--- a/src/asm/rgbasm.5
+++ b/src/asm/rgbasm.5
--- a/src/asm/rpn.c
+++ b/src/asm/rpn.c
@@ -12,7 +12,7 @@
 #include "asm/main.h"
 #include "asm/rpn.h"

-void 
+void
 mergetwoexpressions(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -28,7 +28,7 @@ mergetwoexpressions(struct Expression * expr, struct Expression * src1,
 /*
 * Add a byte to the RPN expression
 */
-void 
+void
 pushbyte(struct Expression * expr, int b)
 {
 	expr->tRPN[expr->nRPNLength++] = b & 0xFF;
@@ -37,7 +37,7 @@ pushbyte(struct Expression * expr, int b)
 /*
 * Reset the RPN module
 */
-void 
+void
 rpn_Reset(struct Expression * expr)
 {
 	expr->nRPNLength = expr->nRPNOut = expr->isReloc = expr->isPCRel = 0;
@@ -46,7 +46,7 @@ rpn_Reset(struct Expression * expr)
 /*
 * Returns the next rpn byte in expression
 */
-UWORD 
+UWORD
 rpn_PopByte(struct Expression * expr)
 {
 	if (expr->nRPNOut == expr->nRPNLength) {
@@ -58,7 +58,7 @@ rpn_PopByte(struct Expression * expr)
 /*
 * Determine if the current expression is relocatable
 */
-ULONG 
+ULONG
 rpn_isReloc(struct Expression * expr)
 {
 	return (expr->isReloc);
@@ -67,7 +67,7 @@ rpn_isReloc(struct Expression * expr)
 /*
 * Determine if the current expression can be pc-relative
 */
-ULONG 
+ULONG
 rpn_isPCRelative(struct Expression * expr)
 {
 	return (expr->isPCRel);
@@ -76,7 +76,7 @@ rpn_isPCRelative(struct Expression * expr)
 /*
 * Add symbols, constants and operators to expression
 */
-void 
+void
 rpn_Number(struct Expression * expr, ULONG i)
 {
 	rpn_Reset(expr);
@@ -88,7 +88,7 @@ rpn_Number(struct Expression * expr, ULONG i)
 	expr->nVal = i;
 }

-void 
+void
 rpn_Symbol(struct Expression * expr, char *tzSym)
 {
 	if (!sym_isConstant(tzSym)) {
@@ -110,7 +110,7 @@ rpn_Symbol(struct Expression * expr, char *tzSym)
 		rpn_Number(expr, sym_GetConstantValue(tzSym));
 }

-void 
+void
 rpn_Bank(struct Expression * expr, char *tzSym)
 {
 	if (!sym_isConstant(tzSym)) {
@@ -128,43 +128,21 @@ rpn_Bank(struct Expression * expr, char *tzSym)
 		yyerror("BANK argument must be a relocatable identifier");
 }

-int 
-rpn_RangeCheck(struct Expression * expr, struct Expression * src, SLONG low,
-    SLONG high)
-{
-	*expr = *src;
-
-	if (rpn_isReloc(src)) {
-		pushbyte(expr, RPN_RANGECHECK);
-		pushbyte(expr, low);
-		pushbyte(expr, low >> 8);
-		pushbyte(expr, low >> 16);
-		pushbyte(expr, low >> 24);
-		pushbyte(expr, high);
-		pushbyte(expr, high >> 8);
-		pushbyte(expr, high >> 16);
-		pushbyte(expr, high >> 24);
-		return (1);
-	} else {
-		return (expr->nVal >= low && expr->nVal <= high);
-	}
-}
-
-void 
+void
 rpn_CheckHRAM(struct Expression * expr, struct Expression * src)
 {
 	*expr = *src;
 	pushbyte(expr, RPN_HRAM);
 }

-void 
+void
 rpn_LOGNOT(struct Expression * expr, struct Expression * src)
 {
 	*expr = *src;
 	pushbyte(expr, RPN_LOGUNNOT);
 }

-void 
+void
 rpn_LOGOR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -173,7 +151,7 @@ rpn_LOGOR(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGOR);
 }

-void 
+void
 rpn_LOGAND(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -182,7 +160,47 @@ rpn_LOGAND(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGAND);
 }

-void 
+void
+rpn_HIGH(struct Expression * expr, struct Expression * src)
+{
+	*expr = *src;
+
+	expr->nVal = (expr->nVal >> 8) & 0xFF;
+
+	pushbyte(expr, RPN_CONST);
+	pushbyte(expr, 8);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+
+	pushbyte(expr, RPN_SHR);
+
+	pushbyte(expr, RPN_CONST);
+	pushbyte(expr, 0xFF);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+
+	pushbyte(expr, RPN_AND);
+}
+
+void
+rpn_LOW(struct Expression * expr, struct Expression * src)
+{
+	*expr = *src;
+
+	expr->nVal = expr->nVal & 0xFF;
+
+	pushbyte(expr, RPN_CONST);
+	pushbyte(expr, 0xFF);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+	pushbyte(expr, 0);
+
+	pushbyte(expr, RPN_AND);
+}
+
+void
 rpn_LOGEQU(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -191,7 +209,7 @@ rpn_LOGEQU(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGEQ);
 }

-void 
+void
 rpn_LOGGT(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -200,7 +218,7 @@ rpn_LOGGT(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGGT);
 }

-void 
+void
 rpn_LOGLT(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -209,7 +227,7 @@ rpn_LOGLT(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGLT);
 }

-void 
+void
 rpn_LOGGE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -218,7 +236,7 @@ rpn_LOGGE(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGGE);
 }

-void 
+void
 rpn_LOGLE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -227,7 +245,7 @@ rpn_LOGLE(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGLE);
 }

-void 
+void
 rpn_LOGNE(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -236,7 +254,7 @@ rpn_LOGNE(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_LOGNE);
 }

-void 
+void
 rpn_ADD(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -245,7 +263,7 @@ rpn_ADD(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_ADD);
 }

-void 
+void
 rpn_SUB(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -254,7 +272,7 @@ rpn_SUB(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_SUB);
 }

-void 
+void
 rpn_XOR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -263,7 +281,7 @@ rpn_XOR(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_XOR);
 }

-void 
+void
 rpn_OR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -272,7 +290,7 @@ rpn_OR(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_OR);
 }

-void 
+void
 rpn_AND(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -281,7 +299,7 @@ rpn_AND(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_AND);
 }

-void 
+void
 rpn_SHL(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -290,7 +308,7 @@ rpn_SHL(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_SHL);
 }

-void 
+void
 rpn_SHR(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -299,7 +317,7 @@ rpn_SHR(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_SHR);
 }

-void 
+void
 rpn_MUL(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -308,7 +326,7 @@ rpn_MUL(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_MUL);
 }

-void 
+void
 rpn_DIV(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -320,7 +338,7 @@ rpn_DIV(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_DIV);
 }

-void 
+void
 rpn_MOD(struct Expression * expr, struct Expression * src1,
    struct Expression * src2)
 {
@@ -332,7 +350,7 @@ rpn_MOD(struct Expression * expr, struct Expression * src1,
 	pushbyte(expr, RPN_MOD);
 }

-void 
+void
 rpn_UNNEG(struct Expression * expr, struct Expression * src)
 {
 	*expr = *src;
@@ -340,7 +358,7 @@ rpn_UNNEG(struct Expression * expr, struct Expression * src)
 	pushbyte(expr, RPN_UNSUB);
 }

-void 
+void
 rpn_UNNOT(struct Expression * expr, struct Expression * src)
 {
 	*expr = *src;
--- a/src/asm/symbol.c
+++ b/src/asm/symbol.c
@@ -12,6 +12,7 @@
 #include "asm/main.h"
 #include "asm/mymath.h"
 #include "asm/output.h"
+#include "extern/err.h"

 struct sSymbol *tHashedSymbols[HASHSIZE];
 struct sSymbol *pScope = NULL;
@@ -21,9 +22,11 @@ char *currentmacroargs[MAXMACROARGS + 1];
 char *newmacroargs[MAXMACROARGS + 1];
 char SavedTIME[256];
 char SavedDATE[256];
+char SavedTIMESTAMP_ISO8601_LOCAL[256];
+char SavedTIMESTAMP_ISO8601_UTC[256];
 bool exportall;

-SLONG 
+SLONG
 Callback_NARG(struct sSymbol * sym)
 {
 	ULONG i = 0;
@@ -37,7 +40,7 @@ Callback_NARG(struct sSymbol * sym)
 /*
 * Get the nValue field of a symbol
 */
-SLONG 
+SLONG
 getvaluefield(struct sSymbol * sym)
 {
 	if (sym->Callback) {
@@ -49,7 +52,7 @@ getvaluefield(struct sSymbol * sym)
 /*
 * Calculate the hash value for a string
 */
-ULONG 
+ULONG
 calchash(char *s)
 {
 	ULONG hash = 5381;
@@ -153,7 +156,7 @@ sym_FindSymbol(char *tzName)
 /*
 * Purge a symbol
 */
-void 
+void
 sym_Purge(char *tzName)
 {
 	struct sSymbol **ppSym;
@@ -184,7 +187,7 @@ sym_Purge(char *tzName)
 /*
 * Determine if a symbol has been defined
 */
-ULONG 
+ULONG
 sym_isConstDefined(char *tzName)
 {
 	struct sSymbol *psym, *pscope;
@@ -208,7 +211,7 @@ sym_isConstDefined(char *tzName)
 	return (0);
 }

-ULONG 
+ULONG
 sym_isDefined(char *tzName)
 {
 	struct sSymbol *psym, *pscope;
@@ -229,7 +232,7 @@ sym_isDefined(char *tzName)
 /*
 * Determine if the symbol is a constant
 */
-ULONG 
+ULONG
 sym_isConstant(char *s)
 {
 	struct sSymbol *psym, *pscope;
@@ -266,7 +269,7 @@ sym_GetStringValue(char *tzSym)
 /*
 * Return a constant symbols value
 */
-ULONG 
+ULONG
 sym_GetConstantValue(char *s)
 {
 	struct sSymbol *psym, *pscope;
@@ -292,7 +295,7 @@ sym_GetConstantValue(char *s)
 /*
 * Return a symbols value... "estimated" if not defined yet
 */
-ULONG 
+ULONG
 sym_GetValue(char *s)
 {
 	struct sSymbol *psym, *pscope;
@@ -331,7 +334,7 @@ sym_GetValue(char *s)
 /*
 * Return a defined symbols value... aborts if not defined yet
 */
-ULONG 
+ULONG
 sym_GetDefinedValue(char *s)
 {
 	struct sSymbol *psym, *pscope;
@@ -360,7 +363,7 @@ sym_GetDefinedValue(char *s)
 /*
 * Macro argument stuff
 */
-void 
+void
 sym_ShiftCurrentMacroArgs(void)
 {
 	SLONG i;
@@ -378,12 +381,13 @@ sym_FindMacroArg(SLONG i)
 	if (i == -1)
 		i = MAXMACROARGS + 1;

-	assert(i-1 >= 0 &&
-	    i-1 < sizeof currentmacroargs / sizeof *currentmacroargs);
+	assert(i-1 >= 0);
+	assert((size_t)(i-1) < sizeof(currentmacroargs)/sizeof(*currentmacroargs));
+
 	return (currentmacroargs[i - 1]);
 }

-void 
+void
 sym_UseNewMacroArgs(void)
 {
 	SLONG i;
@@ -394,7 +398,7 @@ sym_UseNewMacroArgs(void)
 	}
 }

-void 
+void
 sym_SaveCurrentMacroArgs(char *save[])
 {
 	SLONG i;
@@ -403,7 +407,7 @@ sym_SaveCurrentMacroArgs(char *save[])
 		save[i] = currentmacroargs[i];
 }

-void 
+void
 sym_RestoreCurrentMacroArgs(char *save[])
 {
 	SLONG i;
@@ -412,7 +416,7 @@ sym_RestoreCurrentMacroArgs(char *save[])
 		currentmacroargs[i] = save[i];
 }

-void 
+void
 sym_FreeCurrentMacroArgs(void)
 {
 	SLONG i;
@@ -423,7 +427,7 @@ sym_FreeCurrentMacroArgs(void)
 	}
 }

-void 
+void
 sym_AddNewMacroArg(char *s)
 {
 	SLONG i = 0;
@@ -440,7 +444,7 @@ sym_AddNewMacroArg(char *s)
 		yyerror("A maximum of %d arguments allowed", MAXMACROARGS);
 }

-void 
+void
 sym_SetMacroArgID(ULONG nMacroCount)
 {
 	char s[256];
@@ -449,7 +453,7 @@ sym_SetMacroArgID(ULONG nMacroCount)
 	newmacroargs[MAXMACROARGS] = strdup(s);
 }

-void 
+void
 sym_UseCurrentMacroArgs(void)
 {
 	SLONG i;
@@ -470,7 +474,7 @@ sym_FindMacro(char *s)
 /*
 * Add an equated symbol
 */
-void 
+void
 sym_AddEqu(char *tzSym, SLONG value)
 {
 	if ((nPass == 1)
@@ -494,9 +498,18 @@ sym_AddEqu(char *tzSym, SLONG value)
 }

 /*
- * Add a string equated symbol
+ * Add a string equated symbol.
+ *
+ * If the desired symbol is a string it needs to be passed to this function with
+ * quotes inside the string, like sym_AddString("name", "\"test\"), or the
+ * assembler won't be able to use it with DB and similar. This is equivalent as
+ * ``` name EQUS "\"test\"" ```
+ *
+ * If the desired symbol is a register or a number, just the terminator quotes
+ * of the string are enough: sym_AddString("M_PI", "3.1415"). This is the same
+ * as ``` M_PI EQUS "3.1415" ```
 */
-void 
+void
 sym_AddString(char *tzSym, char *tzValue)
 {
 	struct sSymbol *nsym;
@@ -522,7 +535,7 @@ sym_AddString(char *tzSym, char *tzValue)
 /*
 * check if symbol is a string equated symbol
 */
-ULONG 
+ULONG
 sym_isString(char *tzSym)
 {
 	struct sSymbol *pSym;
@@ -537,7 +550,7 @@ sym_isString(char *tzSym)
 /*
 * Alter a SET symbols value
 */
-void 
+void
 sym_AddSet(char *tzSym, SLONG value)
 {
 	struct sSymbol *nsym;
@@ -556,7 +569,7 @@ sym_AddSet(char *tzSym, SLONG value)
 /*
 * Add a local (.name) relocatable symbol
 */
-void 
+void
 sym_AddLocalReloc(char *tzSym)
 {
 	if ((nPass == 1)
@@ -590,7 +603,7 @@ sym_AddLocalReloc(char *tzSym)
 /*
 * Add a relocatable symbol
 */
-void 
+void
 sym_AddReloc(char *tzSym)
 {
 	if ((nPass == 1)
@@ -618,10 +631,53 @@ sym_AddReloc(char *tzSym)
 	pScope = findsymbol(tzSym, NULL);
 }

+/*
+ * Check if the subtraction of two symbols is defined. That is, either both
+ * symbols are defined and the result is a constant, or both symbols are
+ * relocatable and belong to the same section.
+ *
+ * It returns 1 if the difference is defined, 0 if not.
+ */
+int
+sym_IsRelocDiffDefined(char *tzSym1, char *tzSym2)
+{
+	/* Do nothing the first pass. */
+	if (nPass != 2)
+		return 1;
+
+	struct sSymbol *nsym1, *nsym2;
+
+	/* Do the symbols exist? */
+	if ((nsym1 = sym_FindSymbol(tzSym1)) == NULL)
+		fatalerror("Symbol \"%s\" isn't defined.", tzSym1);
+	if ((nsym2 = sym_FindSymbol(tzSym2)) == NULL)
+		fatalerror("Symbol \"%s\" isn't defined.", tzSym2);
+
+	int s1reloc = (nsym1->nType & SYMF_RELOC) != 0;
+	int s2reloc = (nsym2->nType & SYMF_RELOC) != 0;
+
+	/* Both are non-relocatable */
+	if (!s1reloc && !s2reloc) return 1;
+
+	/* One of them relocatable, the other one not. */
+	if (s1reloc ^ s2reloc) return 0;
+
+	/* Both of them are relocatable. Make sure they are defined (internal
+         * coherency with sym_AddReloc and sym_AddLocalReloc). */
+	if (!(nsym1->nType & SYMF_DEFINED))
+		fatalerror("Relocatable symbol \"%s\" isn't defined.", tzSym1);
+	if (!(nsym2->nType & SYMF_DEFINED))
+		fatalerror("Relocatable symbol \"%s\" isn't defined.", tzSym2);
+
+	/* Both of them must be in the same section for the difference to be
+         * defined. */
+	return nsym1->pSection == nsym2->pSection;
+}
+
 /*
 * Export a symbol
 */
-void 
+void
 sym_Export(char *tzSym)
 {
 	if (nPass == 1) {
@@ -645,28 +701,10 @@ sym_Export(char *tzSym)

 }

-/*
- * Import a symbol
- */
-void 
-sym_Import(char *tzSym)
-{
-	if (nPass == 1) {
-		/* only import symbols in pass 1 */
-		struct sSymbol *nsym;
-
-		if (findsymbol(tzSym, NULL)) {
-			yyerror("'%s' already defined", tzSym);
-		}
-		if ((nsym = createsymbol(tzSym)) != NULL)
-			nsym->nType |= SYMF_IMPORT;
-	}
-}
-
 /*
 * Globalize a symbol (export if defined, import if not)
 */
-void 
+void
 sym_Global(char *tzSym)
 {
 	if (nPass == 2) {
@@ -691,7 +729,7 @@ sym_Global(char *tzSym)
 /*
 * Add a macro definition
 */
-void 
+void
 sym_AddMacro(char *tzSym)
 {
 	if ((nPass == 1)
@@ -716,7 +754,7 @@ sym_AddMacro(char *tzSym)
 	}
 }

-/* 
+/*
 * Set whether to export all relocable symbols by default
 */
 void sym_SetExportAll(BBOOL set) {
@@ -726,7 +764,7 @@ void sym_SetExportAll(BBOOL set) {
 /*
 * Prepare for pass #1
 */
-void 
+void
 sym_PrepPass1(void)
 {
 	sym_Init();
@@ -735,7 +773,7 @@ sym_PrepPass1(void)
 /*
 * Prepare for pass #2
 */
-void 
+void
 sym_PrepPass2(void)
 {
 	SLONG i;
@@ -760,23 +798,25 @@ sym_PrepPass2(void)

 	sym_AddString("__TIME__", SavedTIME);
 	sym_AddString("__DATE__", SavedDATE);
+	sym_AddString("__ISO_8601_LOCAL__", SavedTIMESTAMP_ISO8601_LOCAL);
+	sym_AddString("__ISO_8601_UTC__", SavedTIMESTAMP_ISO8601_UTC);
 	sym_AddSet("_RS", 0);

 	sym_AddEqu("_NARG", 0);
 	p_NARGSymbol = findsymbol("_NARG", NULL);
 	p_NARGSymbol->Callback = Callback_NARG;
-	
+
 	math_DefinePI();
 }

 /*
 * Initialize the symboltable
 */
-void 
+void
 sym_Init(void)
 {
 	SLONG i;
-	time_t tod;
+	time_t now;

 	for (i = 0; i < MAXMACROARGS; i += 1) {
 		currentmacroargs[i] = NULL;
@@ -794,15 +834,32 @@ sym_Init(void)

 	sym_AddSet("_RS", 0);

-	if (time(&tod) != -1) {
-		struct tm *tptr;
+	if (time(&now) != -1) {
+		struct tm *time_local = localtime(&now);

-		tptr = localtime(&tod);
-		strftime(SavedTIME, sizeof(SavedTIME), "%H:%M:%S", tptr);
-		strftime(SavedDATE, sizeof(SavedDATE), "%d %B %Y", tptr);
-		sym_AddString("__TIME__", SavedTIME);
-		sym_AddString("__DATE__", SavedDATE);
+		strftime(SavedTIME, sizeof(SavedTIME), "\"%H:%M:%S\"", time_local);
+		strftime(SavedDATE, sizeof(SavedDATE), "\"%d %B %Y\"", time_local);
+		strftime(SavedTIMESTAMP_ISO8601_LOCAL,
+			sizeof(SavedTIMESTAMP_ISO8601_LOCAL), "\"%FT%T%z\"", time_local);
+
+		struct tm *time_utc = gmtime(&now);
+		strftime(SavedTIMESTAMP_ISO8601_UTC,
+			sizeof(SavedTIMESTAMP_ISO8601_UTC), "\"%FT%TZ\"", time_utc);
+	} else {
+		warnx("Couldn't determine current time.");
+		/* The '?' have to be escaped or they will be treated as
+		 * trigraphs... */
+		strcpy(SavedTIME, "\"\?\?:\?\?:\?\?\"");
+		strcpy(SavedDATE, "\"\?\? \?\?\? \?\?\?\?\"");
+		strcpy(SavedTIMESTAMP_ISO8601_LOCAL, "\"\?\?\?\?-\?\?-\?\?T\?\?:\?\?:\?\?+\?\?\?\?\"");
+		strcpy(SavedTIMESTAMP_ISO8601_UTC, "\"\?\?\?\?-\?\?-\?\?T\?\?:\?\?:\?\?Z\"");
 	}
+
+	sym_AddString("__TIME__", SavedTIME);
+	sym_AddString("__DATE__", SavedDATE);
+	sym_AddString("__ISO_8601_LOCAL__", SavedTIMESTAMP_ISO8601_LOCAL);
+	sym_AddString("__ISO_8601_UTC__", SavedTIMESTAMP_ISO8601_UTC);
+
 	pScope = NULL;

 	math_DefinePI();
--- a/src/extern/err.c
+++ b/src/extern/err.c
@@ -26,34 +26,46 @@
 #include <stdlib.h>
 #include "extern/err.h"

-extern char *progname;
-
 void rgbds_vwarn(const char *fmt, va_list ap)
 {
-	fprintf (stderr, "%s: ", progname);
+	fprintf (stderr, "warning");
 	if (fmt) {
-		vfprintf(stderr, fmt, ap);
 		fputs (": ", stderr);
+		vfprintf(stderr, fmt, ap);
 	}
+	putc('\n', stderr);
 	perror(0);
 }

 void rgbds_vwarnx(const char *fmt, va_list ap)
 {
-	fprintf (stderr, "%s: ", progname);
-	if (fmt) vfprintf(stderr, fmt, ap);
+	fprintf (stderr, "warning");
+	if (fmt) {
+		fputs (": ", stderr);
+		vfprintf(stderr, fmt, ap);
+	}
 	putc('\n', stderr);
 }

 noreturn void rgbds_verr(int status, const char *fmt, va_list ap)
 {
-	vwarn(fmt, ap);
+	fprintf (stderr, "error");
+	if (fmt) {
+		fputs (": ", stderr);
+		vfprintf(stderr, fmt, ap);
+	}
+	putc('\n', stderr);
 	exit(status);
 }

 noreturn void rgbds_verrx(int status, const char *fmt, va_list ap)
 {
-	vwarnx(fmt, ap);
+	fprintf (stderr, "error");
+        if (fmt) {
+                fputs (": ", stderr);
+                vfprintf(stderr, fmt, ap);
+        }
+	putc('\n', stderr);
 	exit(status);
 }

--- a/src/fix/main.c
+++ b/src/fix/main.c
@@ -23,8 +23,6 @@

 #include "extern/err.h"

-char *progname;
-
 static void
 usage(void)
 {
@@ -71,8 +69,6 @@ main(int argc, char *argv[])
 	int version;   /* mask ROM version number */
 	int padvalue;  /* to pad the rom with if it changes size */

-	progname = argv[0];
-
 	while ((ch = getopt(argc, argv, "Cci:jk:l:m:n:p:sr:t:v")) != -1) {
 		switch (ch) {
 		case 'C':
--- a/src/fix/rgbfix.1
+++ b/src/fix/rgbfix.1
@@ -1,4 +1,18 @@
-.Dd February 26, 2015
+.\" Copyright © 2010 Anthony J. Bentley <anthony@anjbe.name>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 16, 2017
 .Dt RGBFIX 1
 .Os RGBDS Manual
 .Sh NAME
@@ -88,7 +102,10 @@ Set the title string
 to a given string, truncated to at most 16 characters.
 It is recommended to use 15 characters instead, to avoid clashing with the CGB
 flag
-.Pq Fl c No or Fl C .
+.Po Fl c
+or
+.Fl C
+.Pc .
 If both this and the game ID are set, the game ID will overwrite the
 overlapping portion of the title.
 .It Fl v
@@ -135,5 +152,5 @@ SurvivalKids.gbc
 .Sh HISTORY
 .Nm
 was originally released by Carsten S\(/orensen as a standalone program called
-gbfix.
-It was later integrated with the ASMotor package, which became RGBDS.
+gbfix, and was later packaged in RGBDS by Justin Lloyd. It is now maintained by
+a number of contributors at https://github.com/rednex/rgbds.
--- a/src/gbz80.7
+++ b/src/gbz80.7
--- a/src/gfx/main.c
+++ b/src/gfx/main.c
@@ -19,8 +19,6 @@
 #include <string.h>
 #include "gfx/main.h"

-char *progname;
-
 static void
 usage(void)
 {
@@ -41,8 +39,6 @@ main(int argc, char *argv[])
 	char *ext;
 	const char *errmsg = "Warning: The PNG's %s setting is not the same as the setting defined on the command line.";

-	progname = argv[0];
-
 	if (argc == 1) {
 		usage();
 	}
--- a/src/gfx/makepng.c
+++ b/src/gfx/makepng.c
@@ -316,7 +316,7 @@ output_png_file(struct Options opts, struct PNGImage *png)
 	png_init_io(img, f);

 	png_write_info(img, png->info);
-	
+
 	png_write_image(img, png->data);
 	png_write_end(img, NULL);

--- a/src/gfx/rgbgfx.1
+++ b/src/gfx/rgbgfx.1
@@ -1,4 +1,18 @@
-.Dd $Mdocdate$
+.\" Copyright © 2013 stag019 <stag019@gmail.com>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 8, 2017
 .Dt RGBGFX 1
 .Os RGBDS Manual
 .Sh NAME
@@ -88,3 +102,5 @@ The following will do nothing:
 was created by
 .An stag019
 to be included in RGBDS.
+It is now maintained by a number of contributors at
+https://github.com/rednex/rgbds.
--- a/src/link/.gitignore
+++ b/src/link/.gitignore
@@ -0,0 +1,2 @@
+parser.c
+parser.h
--- a/src/link/assign.c
+++ b/src/link/assign.c
@@ -1,12 +1,14 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <string.h>

 #include "extern/err.h"
+#include "link/assign.h"
 #include "link/mylink.h"
 #include "link/main.h"
+#include "link/script.h"
 #include "link/symbol.h"
-#include "link/assign.h"

 struct sFreeArea {
 	SLONG nOrg;
@@ -30,7 +32,7 @@ SLONG MaxSBankUsed;
 SLONG MaxVBankUsed;

 const enum eSectionType SECT_MIN = SECT_WRAM0;
-const enum eSectionType SECT_MAX = SECT_SRAM;
+const enum eSectionType SECT_MAX = SECT_OAM;
 const struct sSectionAttributes SECT_ATTRIBUTES[] = {
 	{"WRAM0", BANK_WRAM0, 0, 0, BANK_COUNT_WRAM0},
 	{"VRAM",  BANK_VRAM,  0, 0, BANK_COUNT_VRAM},
@@ -38,7 +40,8 @@ const struct sSectionAttributes SECT_ATTRIBUTES[] = {
 	{"ROM0",  BANK_ROM0,  0, 0, BANK_COUNT_ROM0},
 	{"HRAM",  BANK_HRAM,  0, 0, BANK_COUNT_HRAM},
 	{"WRAMX", BANK_WRAMX, 0, 0, BANK_COUNT_WRAMX},
-	{"SRAM",  BANK_SRAM,  0, 0, BANK_COUNT_SRAM}
+	{"SRAM",  BANK_SRAM,  0, 0, BANK_COUNT_SRAM},
+	{"OAM",   BANK_OAM,   0, 0, BANK_COUNT_OAM}
 };

 #define DOMAXBANK(x, y) {switch (x) { \
@@ -46,7 +49,7 @@ const struct sSectionAttributes SECT_ATTRIBUTES[] = {
 	case SECT_WRAMX: DOMAXWBANK(y); break; \
 	case SECT_SRAM: DOMAXSBANK(y); break; \
 	case SECT_VRAM: DOMAXVBANK(y); break; \
-	default: errx(1, "DOMAXBANK used with invalid parameters"); break; }}
+	default: break; }}
 #define DOMAXRBANK(x)	{if( (x)>MaxBankUsed ) MaxBankUsed=(x);}
 #define DOMAXWBANK(x)	{if( (x)>MaxWBankUsed ) MaxWBankUsed=(x);}
 #define DOMAXSBANK(x)	{if( (x)>MaxSBankUsed ) MaxSBankUsed=(x);}
@@ -60,7 +63,7 @@ ensureSectionTypeIsValid(enum eSectionType type)
 	}
 }

-SLONG 
+SLONG
 area_Avail(SLONG bank)
 {
 	SLONG r;
@@ -77,6 +80,40 @@ area_Avail(SLONG bank)
 	return (r);
 }

+SLONG
+area_doAlloc(struct sFreeArea *pArea, SLONG org, SLONG size)
+{
+	if (org >= pArea->nOrg && (org + size) <= (pArea->nOrg + pArea->nSize)) {
+		if (org == pArea->nOrg) {
+			pArea->nOrg += size;
+			pArea->nSize -= size;
+			return org;
+		} else {
+			if ((org + size) == (pArea->nOrg + pArea->nSize)) {
+				pArea->nSize -= size;
+				return org;
+			} else {
+				struct sFreeArea *pNewArea;
+
+				if ((pNewArea = malloc(sizeof(struct sFreeArea))) != NULL) {
+					*pNewArea = *pArea;
+					pNewArea->pPrev = pArea;
+					pArea->pNext = pNewArea;
+					pArea->nSize = org - pArea->nOrg;
+					pNewArea->nOrg = org + size;
+					pNewArea->nSize -= size + pArea->nSize;
+					return org;
+
+				} else {
+					err(1, NULL);
+				}
+			}
+		}
+	}
+
+	return -1;
+}
+
 SLONG
 area_AllocAbs(struct sFreeArea ** ppArea, SLONG org, SLONG size)
 {
@@ -84,39 +121,11 @@ area_AllocAbs(struct sFreeArea ** ppArea, SLONG org, SLONG size)

 	pArea = *ppArea;
 	while (pArea) {
-		if (org >= pArea->nOrg
-		    && (org + size - 1) <= (pArea->nOrg + pArea->nSize - 1)) {
-			if (org == pArea->nOrg) {
-				pArea->nOrg += size;
-				pArea->nSize -= size;
-				return 0;
-			} else {
-				if ((org + size - 1) ==
-				    (pArea->nOrg + pArea->nSize - 1)) {
-					pArea->nSize -= size;
-					return 0;
-				} else {
-					struct sFreeArea *pNewArea;
-
-					if ((pNewArea =
-						malloc(sizeof(struct sFreeArea)))
-					    != NULL) {
-						*pNewArea = *pArea;
-						pNewArea->pPrev = pArea;
-						pArea->pNext = pNewArea;
-						pArea->nSize =
-						    org - pArea->nOrg;
-						pNewArea->nOrg = org + size;
-						pNewArea->nSize -=
-						    size + pArea->nSize;
-
-						return 0;
-					} else {
-						err(1, NULL);
-					}
-				}
-			}
+		SLONG result = area_doAlloc(pArea, org, size);
+		if (result != -1) {
+			return result;
 		}
+
 		ppArea = &(pArea->pNext);
 		pArea = *ppArea;
 	}
@@ -131,7 +140,7 @@ area_AllocAbsAnyBank(SLONG org, SLONG size, enum eSectionType type)

 	SLONG startBank = SECT_ATTRIBUTES[type].bank;
 	SLONG bankCount = SECT_ATTRIBUTES[type].bankCount;
-	
+
 	for (int i = 0; i < bankCount; i++) {
 		if (area_AllocAbs(&BankFree[startBank + i], org, size) != -1) {
 			return startBank + i;
@@ -141,38 +150,42 @@ area_AllocAbsAnyBank(SLONG org, SLONG size, enum eSectionType type)
 	return -1;
 }

-SLONG 
-area_Alloc(struct sFreeArea ** ppArea, SLONG size)
-{
+SLONG
+area_Alloc(struct sFreeArea ** ppArea, SLONG size, SLONG alignment) {
 	struct sFreeArea *pArea;
+	if (alignment < 1) {
+		alignment = 1;
+	}

 	pArea = *ppArea;
 	while (pArea) {
-		if (size <= pArea->nSize) {
-			SLONG r;
-
-			r = pArea->nOrg;
-			pArea->nOrg += size;
-			pArea->nSize -= size;
-
-			return (r);
+		SLONG org = pArea->nOrg;
+		if (org % alignment) {
+			org += alignment;
 		}
+		org -= org % alignment;
+
+		SLONG result = area_doAlloc(pArea, org, size);
+		if (result != -1) {
+			return result;
+		}
+
 		ppArea = &(pArea->pNext);
 		pArea = *ppArea;
 	}

-	return (-1);
+	return -1;
 }

 SLONG
-area_AllocAnyBank(SLONG size, enum eSectionType type) {
+area_AllocAnyBank(SLONG size, SLONG alignment, enum eSectionType type) {
 	ensureSectionTypeIsValid(type);

 	SLONG startBank = SECT_ATTRIBUTES[type].bank;
 	SLONG bankCount = SECT_ATTRIBUTES[type].bankCount;
-	
+
 	for (int i = 0; i < bankCount; i++) {
-		SLONG org = area_Alloc(&BankFree[startBank + i], size);
+		SLONG org = area_Alloc(&BankFree[startBank + i], size, alignment);
 		if (org != -1) {
 			return ((startBank + i) << 16) | org;
 		}
@@ -182,44 +195,94 @@ area_AllocAnyBank(SLONG size, enum eSectionType type) {
 }

 struct sSection *
-FindLargestSection(enum eSectionType type)
+FindLargestSection(enum eSectionType type, bool bankFixed)
 {
 	struct sSection *pSection, *r = NULL;
 	SLONG nLargest = 0;
+	SLONG nLargestAlignment = 0;

 	pSection = pSections;
 	while (pSection) {
-		if (pSection->oAssigned == 0 && pSection->Type == type) {
-			if (pSection->nByteSize > nLargest) {
+		if (pSection->oAssigned == 0 && pSection->Type == type && (bankFixed ^ (pSection->nBank == -1))) {
+			if (pSection->nAlign > nLargestAlignment || (pSection->nAlign == nLargestAlignment && pSection->nByteSize > nLargest)) {
 				nLargest = pSection->nByteSize;
+				nLargestAlignment = pSection->nAlign;
 				r = pSection;
 			}
 		}
 		pSection = pSection->pNext;
 	}
+
 	return r;
 }

-void
-AssignBankedSections(enum eSectionType type)
+int
+IsSectionNameInUse(const char *name)
 {
-	ensureSectionTypeIsValid(type);
-
 	struct sSection *pSection;

-	while ((pSection = FindLargestSection(type))) {
-		SLONG org;
+	pSection = pSections;
+	while (pSection) {
+		if (strcmp(pSection->pzName, name) == 0)
+			return 1;

-		if ((org = area_AllocAnyBank(pSection->nByteSize, type)) != -1) {
-			pSection->nOrg = org & 0xFFFF;
-			pSection->nBank = org >> 16;
-			pSection->oAssigned = 1;
-			DOMAXBANK(pSection->Type, pSection->nBank);
-		} else {
-			errx(1, "Unable to place %s section anywhere",
-				 SECT_ATTRIBUTES[type].name);
-		}
+		pSection = pSection->pNext;
 	}
+
+	return 0;
+}
+
+
+int
+IsSectionSameTypeBankAndFloating(const char *name, enum eSectionType type, int bank)
+{
+	struct sSection *pSection;
+
+	pSection = pSections;
+	while (pSection) {
+		if (pSection->oAssigned == 0) {
+			if (strcmp(pSection->pzName, name) == 0) {
+				/* Section must be floating in source */
+				if (pSection->nOrg != -1 || pSection->nAlign != 1)
+					return 0;
+				/* It must have the same type in source and linkerscript */
+				if (pSection->Type != type)
+					return 0;
+				/* Bank number must be unassigned in source or equal */
+				if (pSection->nBank != -1 && pSection->nBank != bank)
+					return 0;
+				return 1;
+			}
+		}
+		pSection = pSection->pNext;
+	}
+
+	errx(1, "Section \"%s\" not found (or already used).\n", name);
+}
+
+unsigned int
+AssignSectionAddressAndBankByName(const char *name, unsigned int address, int bank)
+{
+	struct sSection *pSection;
+
+	pSection = pSections;
+	while (pSection) {
+		if (pSection->oAssigned == 0) {
+			if (strcmp(pSection->pzName, name) == 0) {
+				if (pSection->nOrg != -1 || pSection->nAlign != 1)
+					errx(1, "Section \"%s\" from linkerscript isn't floating.\n", name);
+				if (pSection->nBank != -1 && pSection->nBank != bank)
+					errx(1, "Section \"%s\" from linkerscript has different bank number than in the source.\n", name);
+				pSection->nOrg = address;
+				pSection->nBank = bank;
+				pSection->nAlign = -1;
+				return pSection->nByteSize;
+			}
+		}
+		pSection = pSection->pNext;
+	}
+
+	errx(1, "Section \"%s\" not found (or already used).\n", name);
 }

 bool
@@ -231,12 +294,79 @@ VerifyAndSetBank(struct sSection *pSection)
 		&& pSection->nBank < SECT_ATTRIBUTES[pSection->Type].minBank + SECT_ATTRIBUTES[pSection->Type].bankCount) {
 		pSection->nBank += SECT_ATTRIBUTES[pSection->Type].bank + SECT_ATTRIBUTES[pSection->Type].offset;
 		return true;
-		
+
 	} else {
 		return false;
 	}
 }

+void
+AssignFixedBankSections(enum eSectionType type)
+{
+	ensureSectionTypeIsValid(type);
+
+	struct sSection *pSection;
+
+	while ((pSection = FindLargestSection(type, true))) {
+		if (VerifyAndSetBank(pSection) &&
+			(pSection->nOrg = area_Alloc(&BankFree[pSection->nBank], pSection->nByteSize, pSection->nAlign)) != -1) {
+			pSection->oAssigned = 1;
+			DOMAXBANK(pSection->Type, pSection->nBank);
+		} else {
+			if (pSection->nAlign <= 1) {
+				errx(1, "Unable to place '%s' (%s section) in bank $%02lX",
+					pSection->pzName, SECT_ATTRIBUTES[pSection->Type].name, pSection->nBank);
+			} else {
+				errx(1, "Unable to place '%s' (%s section) in bank $%02lX (with $%lX-byte alignment)",
+					pSection->pzName, SECT_ATTRIBUTES[pSection->Type].name, pSection->nBank, pSection->nAlign);
+			}
+		}
+	}
+}
+
+void
+AssignFloatingBankSections(enum eSectionType type)
+{
+	ensureSectionTypeIsValid(type);
+
+	struct sSection *pSection;
+
+	while ((pSection = FindLargestSection(type, false))) {
+		SLONG org;
+
+		if ((org = area_AllocAnyBank(pSection->nByteSize, pSection->nAlign, type)) != -1) {
+			if (options & OPT_OVERLAY) {
+				errx(1, "All sections must be fixed when using overlay");
+			}
+			pSection->nOrg = org & 0xFFFF;
+			pSection->nBank = org >> 16;
+			pSection->oAssigned = 1;
+			DOMAXBANK(pSection->Type, pSection->nBank);
+		} else {
+			const char *locality = "anywhere";
+			if (SECT_ATTRIBUTES[pSection->Type].bankCount > 1) {
+				locality = "in any bank";
+			}
+
+			if (pSection->nAlign <= 1) {
+				errx(1, "Unable to place '%s' (%s section) %s",
+					 pSection->pzName, SECT_ATTRIBUTES[type].name, locality);
+			} else {
+				errx(1, "Unable to place '%s' (%s section) %s (with $%lX-byte alignment)",
+					 pSection->pzName, SECT_ATTRIBUTES[type].name, locality, pSection->nAlign);
+			}
+		}
+	}
+}
+
+char *tzLinkerscriptName = NULL;
+
+void
+SetLinkerscriptName(char *tzLinkerscriptFile)
+{
+	tzLinkerscriptName = tzLinkerscriptFile;
+}
+
 void
 AssignSections(void)
 {
@@ -260,7 +390,7 @@ AssignSections(void)
 		if (i == BANK_ROM0) {
 			/* ROM0 bank */
 			BankFree[i]->nOrg = 0x0000;
-			if (options & OPT_SMALL) {
+			if (options & OPT_TINY) {
 				BankFree[i]->nSize = 0x8000;
 			} else {
 				BankFree[i]->nSize = 0x4000;
@@ -268,19 +398,15 @@ AssignSections(void)
 		} else if (i >= BANK_ROMX && i < BANK_ROMX + BANK_COUNT_ROMX) {
 			/* Swappable ROM bank */
 			BankFree[i]->nOrg = 0x4000;
-			/*
-			 * Now, this shouldn't really be necessary... but for
-			 * good measure we'll do it anyway.
-			 */
-			if (options & OPT_SMALL) {
-				BankFree[i]->nSize = 0;
-			} else {
-				BankFree[i]->nSize = 0x4000;
-			}
+			BankFree[i]->nSize = 0x4000;
 		} else if (i == BANK_WRAM0) {
 			/* WRAM */
 			BankFree[i]->nOrg = 0xC000;
-			BankFree[i]->nSize = 0x1000;
+			if (options & OPT_CONTWRAM) {
+				BankFree[i]->nSize = 0x2000;
+			} else {
+				BankFree[i]->nSize = 0x1000;
+			}
 		} else if (i >= BANK_SRAM && i < BANK_SRAM + BANK_COUNT_SRAM) {
 			/* Swappable SRAM bank */
 			BankFree[i]->nOrg = 0xA000;
@@ -292,7 +418,14 @@ AssignSections(void)
 		} else if (i >= BANK_VRAM && i < BANK_VRAM + BANK_COUNT_VRAM) {
 			/* Swappable VRAM bank */
 			BankFree[i]->nOrg = 0x8000;
-			BankFree[i]->nSize = 0x2000;
+			if (options & OPT_DMG_MODE && i != BANK_VRAM) {
+				BankFree[i]->nSize = 0;
+			} else {
+				BankFree[i]->nSize = 0x2000;
+			}
+		} else if (i == BANK_OAM) {
+			BankFree[i]->nOrg = 0xFE00;
+			BankFree[i]->nSize = 0x00A0;
 		} else if (i == BANK_HRAM) {
 			/* HRAM */
 			BankFree[i]->nOrg = 0xFF80;
@@ -300,15 +433,24 @@ AssignSections(void)
 		} else {
 			errx(1, "(INTERNAL) Unknown bank type!");
 		}
-		
+
 		MaxAvail[i] = BankFree[i]->nSize;
 		BankFree[i]->pPrev = NULL;
 		BankFree[i]->pNext = NULL;
 	}

 	/*
-	 * First, let's assign all the fixed sections...
-	 * And all because of that Jens Restemeier character ;)
+	 * First, let's parse the linkerscript.
+	 *
+	 */
+
+	if (tzLinkerscriptName) {
+		script_InitSections();
+		script_Parse(tzLinkerscriptName);
+	}
+
+	/*
+	 * Second, let's assign all the fixed sections...
 	 *
 	 */

@@ -322,12 +464,12 @@ AssignSections(void)
 			case SECT_WRAM0:
 			case SECT_HRAM:
 			case SECT_ROM0:
+			case SECT_OAM:
 				pSection->nBank = SECT_ATTRIBUTES[pSection->Type].bank;
 				if (area_AllocAbs(&BankFree[pSection->nBank], pSection->nOrg,
 					 pSection->nByteSize) == -1) {
-					errx(1, "Unable to load fixed %s section at $%lX",
-						 SECT_ATTRIBUTES[pSection->Type].name,
-						 pSection->nOrg);
+					errx(1, "Unable to place '%s' (%s section) at $%lX",
+						 pSection->pzName, SECT_ATTRIBUTES[pSection->Type].name, pSection->nOrg);
 				}
 				pSection->oAssigned = 1;
 				break;
@@ -342,8 +484,8 @@ AssignSections(void)
 						DOMAXBANK(pSection->Type, pSection->nBank);
 						pSection->oAssigned = 1;
 					} else {
-						errx(1,
-							 "Unable to load fixed %s section at $%lX in bank $%02lX", SECT_ATTRIBUTES[pSection->Type].name, pSection->nOrg, pSection->nBank);
+						errx(1, "Unable to place '%s' (%s section) at $%lX in bank $%02lX",
+							pSection->pzName, SECT_ATTRIBUTES[pSection->Type].name, pSection->nOrg, pSection->nBank);
 					}
 				}
 				break;
@@ -353,35 +495,11 @@ AssignSections(void)
 	}

 	/*
-	 * Next, let's assign all the bankfixed ONLY ROMX sections...
+	 * Next, let's assign all the bankfixed ONLY sections...
 	 *
 	 */
-
-	pSection = pSections;
-	while (pSection) {
-		if (pSection->oAssigned == 0
-			&& pSection->nOrg == -1 && pSection->nBank != -1) {
-			switch (pSection->Type) {
-			case SECT_ROMX:
-			case SECT_SRAM:
-			case SECT_VRAM:
-			case SECT_WRAMX:
-				if (VerifyAndSetBank(pSection) &&
-					(pSection->nOrg = area_Alloc(&BankFree[pSection->nBank], pSection->nByteSize)) != -1) {
-					pSection->oAssigned = 1;
-					DOMAXBANK(pSection->Type, pSection->nBank);
-				} else {
-					errx(1, "Unable to load fixed %s section into bank $%02lX",
-						 SECT_ATTRIBUTES[pSection->Type].name, pSection->nBank);
-				}
-				break;
-
-			default: // Handle other sections later
-				break;
-			}
-		}
-
-		pSection = pSection->pNext;
+	for (enum eSectionType i = SECT_MIN; i <= SECT_MAX; i++) {
+		AssignFixedBankSections(i);
 	}

 	/*
@@ -393,6 +511,9 @@ AssignSections(void)
 	while (pSection) {
 		if (pSection->oAssigned == 0
 			&& pSection->nOrg != -1 && pSection->nBank == -1) {
+			if (options & OPT_OVERLAY) {
+				errx(1, "All sections must be fixed when using overlay");
+			}
 			switch (pSection->Type) {
 			case SECT_ROMX:
 			case SECT_VRAM:
@@ -401,13 +522,13 @@ AssignSections(void)
 				if ((pSection->nBank =
 					area_AllocAbsAnyBank(pSection->nOrg, pSection->nByteSize,
 						pSection->Type)) == -1) {
-					errx(1, "Unable to load fixed %s section at $%lX into any bank",
-						 SECT_ATTRIBUTES[pSection->Type].name, pSection->nOrg);
+					errx(1, "Unable to place '%s' (%s section) at $%lX in any bank",
+						 pSection->pzName, SECT_ATTRIBUTES[pSection->Type].name, pSection->nOrg);
 				}
 				pSection->oAssigned = 1;
 				DOMAXBANK(pSection->Type, pSection->nBank);
 				break;
-					
+
 			default: // Handle other sections later
 				break;
 			}
@@ -421,44 +542,12 @@ AssignSections(void)
 	 * sections
 	 *
 	 */
-
-	pSection = pSections;
-	while (pSection) {
-		if (pSection->oAssigned == 0) {
-			switch (pSection->Type) {
-			case SECT_WRAM0:
-			case SECT_HRAM:
-			case SECT_ROM0:
-				pSection->nBank = SECT_ATTRIBUTES[pSection->Type].bank;
-				if ((pSection->nOrg =
-					area_Alloc(&BankFree[pSection->nBank],
-					    pSection->nByteSize)) == -1) {
-					errx(1, "%s section too large", SECT_ATTRIBUTES[pSection->Type].name);
-				}
-				pSection->oAssigned = 1;
-				break;
-
-			case SECT_SRAM:
-			case SECT_VRAM:
-			case SECT_WRAMX:
-			case SECT_ROMX:
-				break;
-
-			default:
-				errx(1, "(INTERNAL) Unknown section type!");
-				break;
-			}
-		}
-		pSection = pSection->pNext;
+	for (enum eSectionType i = SECT_MIN; i <= SECT_MAX; i++) {
+		AssignFloatingBankSections(i);
 	}
-
-	AssignBankedSections(SECT_ROMX);
-	AssignBankedSections(SECT_VRAM);
-	AssignBankedSections(SECT_WRAMX);
-	AssignBankedSections(SECT_SRAM);
 }

-void 
+void
 CreateSymbolTable(void)
 {
 	struct sSection *pSect;
--- a/src/link/lexer.l
+++ b/src/link/lexer.l
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+%option noinput
+%option yylineno
+
+%{
+#include <stdarg.h>
+#include <unistd.h>
+
+#include "extern/err.h"
+#include "link/mylink.h"
+#include "link/script.h"
+
+#include "parser.h"
+
+extern int yyparse();
+
+/* File include stack. */
+
+#define	MAX_INCLUDE_DEPTH 8
+
+static int include_stack_ptr = 0;
+
+static YY_BUFFER_STATE include_stack[MAX_INCLUDE_DEPTH];
+static char include_path[MAX_INCLUDE_DEPTH][_MAX_PATH + 1];
+static int include_line[MAX_INCLUDE_DEPTH];
+
+static char linkerscript_path[_MAX_PATH + 1]; /* Base file */
+%}
+
+%%
+
+\"([^\\\"]|\\.)*\" {
+			if (strlen(yytext) > sizeof(yylval.s) - 1)
+				script_fatalerror("String is too long: %s\n.", yytext);
+			if (strlen(yytext) < 3) /* 2 quotes + 1 character */
+				script_fatalerror("String %s is invalid\n.", yytext);
+
+			yytext++; /* ignore first quote */
+			strcpy(yylval.s, yytext);
+			yylval.s[strlen(yylval.s)-1] = '\0'; /* remove end quote */
+
+			return STRING;
+		}
+
+\$[a-fA-F0-9]+	{
+			yytext++; /* Skip prefix */
+			yylval.i = strtol(yytext, NULL, 16);
+			return INTEGER;
+		}
+[0-9]+		{
+			yylval.i = strtol(yytext, NULL, 10);
+			return INTEGER;
+		}
+
+(?i:ROM0)	{ strcpy(yylval.s, "ROM0");  return SECTION_NONBANKED; }
+(?i:ROMX)	{ strcpy(yylval.s, "ROMX");  return SECTION_BANKED; }
+(?i:VRAM)	{ strcpy(yylval.s, "VRAM");  return SECTION_BANKED; }
+(?i:WRAM0)	{ strcpy(yylval.s, "WRAM0"); return SECTION_NONBANKED; }
+(?i:WRAMX)	{ strcpy(yylval.s, "WRAMX"); return SECTION_BANKED; }
+(?i:SRAM)	{ strcpy(yylval.s, "SRAM");  return SECTION_BANKED; }
+(?i:OAM)	{ strcpy(yylval.s, "OAM");   return SECTION_NONBANKED; }
+(?i:HRAM)	{ strcpy(yylval.s, "HRAM");  return SECTION_NONBANKED; }
+
+(?i:ALIGN)	{ return COMMAND_ALIGN; }
+(?i:ORG)	{ return COMMAND_ORG; }
+
+(?i:INCLUDE)	{ return COMMAND_INCLUDE; }
+
+"\n"		{ return NEWLINE; }
+
+;.*		{ /* Ignore comments. A dot doesn't match newline. */ }
+
+[[:space:]]	{ /* Ignore whitespace. */ }
+
+.		{ script_fatalerror("Invalid character [%s]\n.", yytext); }
+
+%%
+
+extern FILE *yyin;
+
+void script_Parse(const char * path)
+{
+	yyin = fopen(path, "r");
+
+	if (!yyin)
+		errx(1, "Error opening file! \"%s\"\n", path);
+
+	strncpy(linkerscript_path, path, sizeof(linkerscript_path));
+	linkerscript_path[sizeof(linkerscript_path) - 1] = '\0';
+
+	do {
+		yyparse();
+	} while (!feof(yyin));
+
+	fclose(yyin);
+
+}
+
+void script_IncludeFile(const char * path)
+{
+	if (include_stack_ptr == (MAX_INCLUDE_DEPTH-1))
+		script_fatalerror("Includes nested too deeply.");
+
+	include_line[include_stack_ptr] = yylineno;
+	include_stack[include_stack_ptr] = YY_CURRENT_BUFFER;
+
+	include_stack_ptr++;
+
+	yyin = fopen(path, "r" );
+
+	if (!yyin)
+		script_fatalerror("Couldn't open file \"%s\"", path);
+
+	strncpy(include_path[include_stack_ptr], path, sizeof(include_path[0]));
+	include_path[include_stack_ptr][sizeof(include_path[0])-1] = '\0';
+
+	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
+	yylineno = 1;
+
+	/*
+	 * The INCLUDE keyword is handled before reaching a newline token, it's
+	 * handled right after parsing the string with the file name that has to
+	 * be included. It isn't actually needed to include a newline after the
+	 * path, the last line of the linkerscript doesn't need to have a
+	 * newline character but it can have a command.
+	 *
+	 * This means that, when opening a new file, we must tell the parser
+	 * that what it is going to start at a new line or it will think that
+	 * the first line of the included script is the continuation of the
+	 * INCLUDE line of the parent script. If this is not done, the first
+	 * line of an included linkerscript can only be a comment (or empty).
+	 */
+	unput('\n');
+}
+
+int script_IncludeDepthGet(void)
+{
+	return include_stack_ptr;
+}
+
+void script_IncludePop(void)
+{
+	fclose(yyin);
+
+	include_stack_ptr--;
+
+	yy_delete_buffer(YY_CURRENT_BUFFER);
+	yy_switch_to_buffer(include_stack[include_stack_ptr]);
+	yylineno = include_line[include_stack_ptr];
+}
+
+void script_PrintFileStack(void)
+{
+	int i = include_stack_ptr;
+
+	include_line[i] = yylineno;
+
+	while (i > 0) {
+		fprintf(stderr, "%s(%d) -> ", include_path[i], include_line[i]);
+		i--;
+	}
+	fprintf(stderr, "%s(%d)", linkerscript_path, include_line[i]);
+}
+
+noreturn void script_fatalerror(const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+	fprintf(stderr, "error: ");
+	script_PrintFileStack();
+	fprintf(stderr, ":\n\t");
+	vfprintf(stderr, fmt, args);
+	fprintf(stderr, "\n");
+	va_end(args);
+	exit(1);
+}
+
--- a/src/link/library.c
+++ b/src/link/library.c
@@ -7,7 +7,7 @@
 #include "link/mylink.h"
 #include "link/main.h"

-static BBOOL 
+static BBOOL
 symboldefined(char *name)
 {
 	struct sSection *pSect;
@@ -15,7 +15,7 @@ symboldefined(char *name)
 	pSect = pSections;

 	while (pSect) {
-		ULONG i;
+		int i;

 		for (i = 0; i < pSect->nNumberOfSymbols; i += 1) {
 			if ((pSect->tSymbols[i]->Type == SYM_EXPORT)
@@ -31,7 +31,7 @@ symboldefined(char *name)
 	return (0);
 }

-static BBOOL 
+static BBOOL
 addmodulecontaining(char *name)
 {
 	struct sSection **ppLSect;
@@ -39,7 +39,7 @@ addmodulecontaining(char *name)
 	ppLSect = &pLibSections;

 	while (*ppLSect) {
-		ULONG i;
+		int i;

 		for (i = 0; i < (*ppLSect)->nNumberOfSymbols; i += 1) {
 			if (((*ppLSect)->tSymbols[i]->Type == SYM_EXPORT)
@@ -66,7 +66,7 @@ addmodulecontaining(char *name)
 	return (0);
 }

-void 
+void
 AddNeededModules(void)
 {
 	struct sSection *pSect;
@@ -101,7 +101,7 @@ AddNeededModules(void)
 	pSect = pSections;

 	while (pSect) {
-		ULONG i;
+		int i;

 		for (i = 0; i < pSect->nNumberOfSymbols; i += 1) {
 			if ((pSect->tSymbols[i]->Type == SYM_IMPORT)
--- a/src/link/main.c
+++ b/src/link/main.c
@@ -24,19 +24,17 @@ SLONG options = 0;
 SLONG fillchar = 0;
 char *smartlinkstartsymbol;

-char *progname;
-
 /*
 * Print the usagescreen
 *
 */

-static void 
+static void
 usage(void)
 {
 	printf(
-"usage: rgblink [-t] [-m mapfile] [-n symfile] [-o outfile] [-p pad_value]\n"
-"               [-s symbol] file [...]\n");
+"usage: rgblink [-twd] [-l linkerscript] [-m mapfile] [-n symfile] [-O overlay]\n"
+"               [-o outfile] [-p pad_value] [-s symbol] file [...]\n");
 	exit(1);
 }

@@ -45,7 +43,7 @@ usage(void)
 *
 */

-int 
+int
 main(int argc, char *argv[])
 {
 	int ch;
@@ -54,10 +52,11 @@ main(int argc, char *argv[])
 	if (argc == 1)
 		usage();

-	progname = argv[0];
-
-	while ((ch = getopt(argc, argv, "m:n:o:p:s:t")) != -1) {
+	while ((ch = getopt(argc, argv, "l:m:n:o:O:p:s:twd")) != -1) {
 		switch (ch) {
+		case 'l':
+			SetLinkerscriptName(optarg);
+			break;
 		case 'm':
 			SetMapfileName(optarg);
 			break;
@@ -67,6 +66,10 @@ main(int argc, char *argv[])
 		case 'o':
 			out_Setname(optarg);
 			break;
+		case 'O':
+			out_SetOverlayname(optarg);
+			options |= OPT_OVERLAY;
+			break;
 		case 'p':
 			fillchar = strtoul(optarg, &ep, 0);
 			if (optarg[0] == '\0' || *ep != '\0') {
@@ -82,7 +85,26 @@ main(int argc, char *argv[])
 			smartlinkstartsymbol = optarg;
 			break;
 		case 't':
-			options |= OPT_SMALL;
+			options |= OPT_TINY;
+			break;
+		case 'd':
+			/*
+			 * Set to set WRAM as a single continuous block as on
+			 * DMG. All WRAM sections must be WRAM0 as bankable WRAM
+			 * sections do not exist in this mode. A WRAMX section
+			 * will raise an error. VRAM bank 1 can't be used if
+			 * this option is enabled either.
+			 *
+			 * This option implies OPT_CONTWRAM.
+			 */
+			options |= OPT_DMG_MODE;
+			/* fallthrough */
+		case 'w':
+			/* Set to set WRAM as a single continuous block as on
+			 * DMG. All WRAM sections must be WRAM0 as bankable WRAM
+			 * sections do not exist in this mode. A WRAMX section
+			 * will raise an error. */
+			options |= OPT_CONTWRAM;
 			break;
 		default:
 			usage();
--- a/src/link/mapfile.c
+++ b/src/link/mapfile.c
@@ -13,7 +13,7 @@ FILE *sf = NULL;
 SLONG currentbank = 0;
 SLONG sfbank;

-void 
+void
 SetMapfileName(char *name)
 {
 	mf = fopen(name, "w");
@@ -23,7 +23,7 @@ SetMapfileName(char *name)
 	}
 }

-void 
+void
 SetSymfileName(char *name)
 {
 	sf = fopen(name, "w");
@@ -35,7 +35,7 @@ SetSymfileName(char *name)
 	fprintf(sf, ";File generated by rgblink\n\n");
 }

-void 
+void
 CloseMapfile(void)
 {
 	if (mf) {
@@ -48,7 +48,7 @@ CloseMapfile(void)
 	}
 }

-void 
+void
 MapfileInitBank(SLONG bank)
 {
 	if (mf) {
@@ -65,6 +65,8 @@ MapfileInitBank(SLONG bank)
 			fprintf(mf, "HRAM:\n");
 		else if (bank == BANK_VRAM || bank == BANK_VRAM + 1)
 			fprintf(mf, "VRAM Bank #%ld:\n", bank - BANK_VRAM);
+		else if (bank == BANK_OAM)
+			fprintf(mf, "OAM:\n");
 		else if (bank < MAXBANKS)
 			fprintf(mf, "SRAM Bank #%ld:\n", bank - BANK_SRAM);
 	}
@@ -79,6 +81,8 @@ MapfileInitBank(SLONG bank)
 			sfbank = 0;
 		else if (bank == BANK_VRAM || bank == BANK_VRAM + 1)
 			sfbank = bank - BANK_VRAM;
+		else if (bank == BANK_OAM)
+			sfbank = 0;
 		else if (bank < MAXBANKS)
 			sfbank = bank - BANK_SRAM;
 		else
@@ -86,15 +90,20 @@ MapfileInitBank(SLONG bank)
 	}
 }

-void 
+void
 MapfileWriteSection(struct sSection * pSect)
 {
 	SLONG i;

 	if (mf) {
-		fprintf(mf, "  SECTION: $%04lX-$%04lX ($%04lX bytes)\n",
-		    pSect->nOrg, pSect->nOrg + pSect->nByteSize - 1,
-		    pSect->nByteSize);
+		if (pSect->nByteSize > 0) {
+			fprintf(mf, "  SECTION: $%04lX-$%04lX ($%04lX bytes) [\"%s\"]\n",
+				pSect->nOrg, pSect->nOrg + pSect->nByteSize - 1,
+				pSect->nByteSize, pSect->pzName);
+		} else {
+			fprintf(mf, "  SECTION: $%04lX ($0 bytes) [\"%s\"]\n",
+				pSect->nOrg, pSect->pzName);
+		}
 	}

 	for (i = 0; i < pSect->nNumberOfSymbols; i += 1) {
@@ -116,7 +125,7 @@ MapfileWriteSection(struct sSection * pSect)
 	}
 }

-void 
+void
 MapfileCloseBank(SLONG slack)
 {
 	if (!mf)
--- a/src/link/object.c
+++ b/src/link/object.c
@@ -9,6 +9,7 @@
 #include <string.h>

 #include "extern/err.h"
+#include "link/assign.h"
 #include "link/mylink.h"
 #include "link/main.h"

@@ -23,7 +24,7 @@ BBOOL oReadLib = 0;
 *
 */

-SLONG 
+SLONG
 readlong(FILE * f)
 {
 	SLONG r;
@@ -36,7 +37,7 @@ readlong(FILE * f)
 	return (r);
 }

-UWORD 
+UWORD
 readword(FILE * f)
 {
 	UWORD r;
@@ -46,21 +47,41 @@ readword(FILE * f)

 	return (r);
 }
+
 /*
 * Read a NULL terminated string from a file
 *
 */
-
-SLONG 
-readasciiz(char *s, FILE * f)
+SLONG
+readasciiz(char **dest, FILE *f)
 {
-	SLONG r = 0;
+	size_t r = 0;

-	while (((*s++) = fgetc(f)) != 0)
+	size_t bufferLength = 16;
+	char *start = malloc(bufferLength);
+	char *s = start;
+
+	if (!s) {
+		err(1, NULL);
+	}
+
+	while (((*s++) = fgetc(f)) != 0) {
 		r += 1;

+		if (r >= bufferLength) {
+			bufferLength *= 2;
+			start = realloc(start, bufferLength);
+			if (!start) {
+				err(1, NULL);
+			}
+			s = start + r;
+		}
+	}
+
+	*dest = start;
 	return (r + 1);
 }
+
 /*
 * Allocate a new section and link it into the list
 *
@@ -97,7 +118,6 @@ AllocSection(void)
 struct sSymbol *
 obj_ReadSymbol(FILE * f)
 {
-	char s[256];
 	struct sSymbol *pSym;

 	pSym = malloc(sizeof *pSym);
@@ -105,194 +125,50 @@ obj_ReadSymbol(FILE * f)
 		err(1, NULL);
 	}

-	readasciiz(s, f);
-	pSym->pzName = malloc(strlen(s) + 1);
-	if (!pSym->pzName) {
-		err(1, NULL);
-	}
-
-	strcpy(pSym->pzName, s);
+	readasciiz(&pSym->pzName, f);
 	if ((pSym->Type = (enum eSymbolType) fgetc(f)) != SYM_IMPORT) {
 		pSym->nSectionID = readlong(f);
 		pSym->nOffset = readlong(f);
 	}
 	return pSym;
 }
+
 /*
- * RGB0 object reader routines
+ * RGB object reader routines
 *
 */
-
 struct sSection *
-obj_ReadRGB0Section(FILE * f)
+obj_ReadRGBSection(FILE * f)
 {
 	struct sSection *pSection;

+	char *pzName;
+	readasciiz(&pzName, f);
+	if (IsSectionNameInUse(pzName))
+		errx(1, "Section name \"%s\" is already in use.", pzName);
+
 	pSection = AllocSection();
+	pSection->pzName = pzName;

 	pSection->nByteSize = readlong(f);
 	pSection->Type = (enum eSectionType) fgetc(f);
-	pSection->nOrg = -1;
-	pSection->nBank = -1;
-
-	/* does the user want the -s mode? */
-
-	if ((options & OPT_SMALL) && (pSection->Type == SECT_ROMX)) {
-		pSection->Type = SECT_ROM0;
-	}
-	if ((pSection->Type == SECT_ROMX) || (pSection->Type == SECT_ROM0)) {
-		/*
-		 * These sectiontypes contain data...
-		 *
-		 */
-		if (pSection->nByteSize) {
-			pSection->pData = malloc(pSection->nByteSize);
-			if (!pSection->pData) {
-				err(1, NULL);
-			}
-
-			SLONG nNumberOfPatches;
-			struct sPatch **ppPatch, *pPatch;
-			char s[256];
-
-			fread(pSection->pData, sizeof(UBYTE),
-			    pSection->nByteSize, f);
-			nNumberOfPatches = readlong(f);
-			ppPatch = &pSection->pPatches;
-
-			/*
-			 * And patches...
-			 *
-			 */
-			while (nNumberOfPatches--) {
-				pPatch = malloc(sizeof *pPatch);
-				if (!pPatch) {
-					err(1, NULL);
-				}
-
-				*ppPatch = pPatch;
-				readasciiz(s, f);
-
-				pPatch->pzFilename = malloc(strlen(s) + 1);
-				if (!pPatch->pzFilename) {
-					err(1, NULL);
-				}
-
-				strcpy(pPatch->pzFilename, s);
-
-				pPatch->nLineNo =
-				    readlong(f);
-				pPatch->nOffset =
-				    readlong(f);
-				pPatch->Type =
-				    (enum ePatchType)
-				    fgetc(f);
-
-				if ((pPatch->nRPNSize = readlong(f)) > 0) {
-					pPatch->pRPN = malloc(pPatch->nRPNSize);
-					if (!pPatch->pRPN) {
-						err(1, NULL);
-					}
-
-					fread(pPatch->pRPN, sizeof(UBYTE),
-					    pPatch->nRPNSize, f);
-				} else
-					pPatch->pRPN = NULL;
-
-				pPatch->pNext = NULL;
-				ppPatch = &(pPatch->pNext);
-			}
-		} else {
-			/* Skip number of patches */
-			readlong(f);
-			pSection->pData = &dummymem;
-		}
-	}
-	return pSection;
-}
-
-void 
-obj_ReadRGB0(FILE * pObjfile)
-{
-	struct sSection *pFirstSection;
-	SLONG nNumberOfSymbols, nNumberOfSections, i;
-
-	nNumberOfSymbols = readlong(pObjfile);
-	nNumberOfSections = readlong(pObjfile);
-
-	/* First comes the symbols */
-
-	if (nNumberOfSymbols) {
-		tSymbols = malloc(nNumberOfSymbols * sizeof(struct sSymbol *));
-		if (!tSymbols) {
-			err(1, NULL);
-		}
-
-		for (i = 0; i < nNumberOfSymbols; i += 1)
-			tSymbols[i] = obj_ReadSymbol(pObjfile);
-	} else
-		tSymbols = (struct sSymbol **) & dummymem;
-
-	/* Next we have the sections */
-
-	pFirstSection = NULL;
-	while (nNumberOfSections--) {
-		struct sSection *pNewSection;
-
-		pNewSection = obj_ReadRGB0Section(pObjfile);
-		pNewSection->nNumberOfSymbols = nNumberOfSymbols;
-		if (pFirstSection == NULL)
-			pFirstSection = pNewSection;
-	}
-
-	/*
-	 * Fill in the pSection entry in the symbolstructure.
-	 * This REALLY needs some cleaning up... but, hey, it works
-	 *
-	 */
-
-	for (i = 0; i < nNumberOfSymbols; i += 1) {
-		struct sSection *pConvSect = pFirstSection;
-
-		if (tSymbols[i]->Type != SYM_IMPORT
-		    && tSymbols[i]->nSectionID != -1) {
-			SLONG j = 0;
-			while (j != tSymbols[i]->nSectionID) {
-				j += 1;
-				pConvSect = pConvSect->pNext;
-			}
-			tSymbols[i]->pSection = pConvSect;
-		} else
-			tSymbols[i]->pSection = NULL;
-	}
-}
-/*
- * RGB1 object reader routines
- *
- */
-
-struct sSection *
-obj_ReadRGB1Section(FILE * f)
-{
-	struct sSection *pSection;
-
-	pSection = AllocSection();
-
-	pSection->nByteSize = readlong(f);
-	pSection->Type = (enum eSectionType) fgetc(f);
-	/*
-	 * And because of THIS new feature I'll have to rewrite loads and
-	 * loads of stuff... oh well it needed to be done anyway
-	 *
-	 */
 	pSection->nOrg = readlong(f);
 	pSection->nBank = readlong(f);
+	pSection->nAlign = readlong(f);

-	/* does the user want the -s mode? */
-
-	if ((options & OPT_SMALL) && (pSection->Type == SECT_ROMX)) {
-		pSection->Type = SECT_ROM0;
+	if ((options & OPT_TINY) && (pSection->Type == SECT_ROMX)) {
+		errx(1,  "ROMX sections can't be used with option -t.");
 	}
+	if ((options & OPT_CONTWRAM) && (pSection->Type == SECT_WRAMX)) {
+		errx(1, "WRAMX sections can't be used with option -w.");
+	}
+	if (options & OPT_DMG_MODE) {
+		/* WRAMX sections are checked for OPT_CONTWRAM */
+		if (pSection->Type == SECT_VRAM && pSection->nBank == 1) {
+			errx(1, "VRAM bank 1 can't be used with option -w.");
+		}
+	}
+
 	if ((pSection->Type == SECT_ROMX) || (pSection->Type == SECT_ROM0)) {
 		/*
 		 * These sectiontypes contain data...
@@ -306,7 +182,6 @@ obj_ReadRGB1Section(FILE * f)

 			SLONG nNumberOfPatches;
 			struct sPatch **ppPatch, *pPatch;
-			char s[256];

 			fread(pSection->pData, sizeof(UBYTE),
 			    pSection->nByteSize, f);
@@ -324,13 +199,7 @@ obj_ReadRGB1Section(FILE * f)
 				}

 				*ppPatch = pPatch;
-				readasciiz(s, f);
-				pPatch->pzFilename = malloc(strlen(s) + 1);
-				if (!pPatch->pzFilename) {
-					err(1, NULL);
-				}
-
-				strcpy(pPatch->pzFilename, s);
+				readasciiz(&pPatch->pzFilename, f);
 				pPatch->nLineNo = readlong(f);
 				pPatch->nOffset = readlong(f);
 				pPatch->Type = (enum ePatchType) fgetc(f);
@@ -357,8 +226,8 @@ obj_ReadRGB1Section(FILE * f)
 	return pSection;
 }

-void 
-obj_ReadRGB1(FILE * pObjfile)
+void
+obj_ReadRGB(FILE * pObjfile)
 {
 	struct sSection *pFirstSection;
 	SLONG nNumberOfSymbols, nNumberOfSections, i;
@@ -385,7 +254,7 @@ obj_ReadRGB1(FILE * pObjfile)
 	while (nNumberOfSections--) {
 		struct sSection *pNewSection;

-		pNewSection = obj_ReadRGB1Section(pObjfile);
+		pNewSection = obj_ReadRGBSection(pObjfile);
 		pNewSection->nNumberOfSymbols = nNumberOfSymbols;
 		if (pFirstSection == NULL)
 			pFirstSection = pNewSection;
@@ -417,7 +286,7 @@ obj_ReadRGB1(FILE * pObjfile)
 *
 */

-void 
+void
 obj_ReadOpenFile(FILE * pObjfile, char *tzObjectfile)
 {
 	char tzHeader[8];
@@ -426,23 +295,19 @@ obj_ReadOpenFile(FILE * pObjfile, char *tzObjectfile)
 	tzHeader[4] = 0;
 	if (strncmp(tzHeader, "RGB", 3) == 0) {
 		switch (tzHeader[3]) {
-		case '0':
-			obj_ReadRGB0(pObjfile);
-			break;
-		case '1':
-		case '2':
-			//V2 is really the same but the are new patch types
-			    obj_ReadRGB1(pObjfile);
+		case '3':
+		case '4': // V4 supports OAM sections, but is otherwise identical
+			obj_ReadRGB(pObjfile);
 			break;
 		default:
-			errx(1, "'%s' is an unsupported version", tzObjectfile);
+			errx(1, "'%s' uses an unsupported object file version (%s). Please reassemble it.", tzObjectfile, tzHeader);
 		}
 	} else {
 		errx(1, "'%s' is not a valid object", tzObjectfile);
 	}
 }

-void 
+void
 obj_Readfile(char *tzObjectfile)
 {
 	FILE *pObjfile;
@@ -462,7 +327,7 @@ obj_Readfile(char *tzObjectfile)
 	oReadLib = 0;
 }

-SLONG 
+SLONG
 file_Length(FILE * f)
 {
 	ULONG r, p;
@@ -475,16 +340,16 @@ file_Length(FILE * f)
 	return (r);
 }

-void 
+void
 lib_ReadXLB0(FILE * f)
 {
 	SLONG size;

 	size = file_Length(f) - 4;
 	while (size) {
-		char name[256];
+		char *name;

-		size -= readasciiz(name, f);
+		size -= readasciiz(&name, f);
 		readword(f);
 		size -= 2;
 		readword(f);
@@ -492,5 +357,6 @@ lib_ReadXLB0(FILE * f)
 		size -= readlong(f);
 		size -= 4;
 		obj_ReadOpenFile(f, name);
+		free(name);
 	}
 }
--- a/src/link/output.c
+++ b/src/link/output.c
@@ -8,9 +8,12 @@
 #include "link/assign.h"

 char *tzOutname;
+char *tzOverlayname = NULL;

-void 
-writehome(FILE * f)
+SLONG MaxOverlayBank;
+
+void
+writehome(FILE * f, FILE * f_overlay)
 {
 	struct sSection *pSect;
 	UBYTE *mem;
@@ -19,14 +22,19 @@ writehome(FILE * f)
 	if (!mem)
 		return;

-	memset(mem, fillchar, MaxAvail[BANK_ROM0]);
+	if (f_overlay != NULL) {
+		fseek(f_overlay, 0L, SEEK_SET);
+		fread(mem, 1, MaxAvail[BANK_ROM0], f_overlay);
+	} else {
+		memset(mem, fillchar, MaxAvail[BANK_ROM0]);
+	}
 	MapfileInitBank(0);

 	pSect = pSections;
 	while (pSect) {
 		if (pSect->Type == SECT_ROM0) {
 			memcpy(mem + pSect->nOrg, pSect->pData,
-			    pSect->nByteSize);
+				pSect->nByteSize);
 			MapfileWriteSection(pSect);
 		}
 		pSect = pSect->pNext;
@@ -38,8 +46,8 @@ writehome(FILE * f)
 	free(mem);
 }

-void 
-writebank(FILE * f, SLONG bank)
+void
+writebank(FILE * f, FILE * f_overlay, SLONG bank)
 {
 	struct sSection *pSect;
 	UBYTE *mem;
@@ -48,14 +56,19 @@ writebank(FILE * f, SLONG bank)
 	if (!mem)
 		return;

-	memset(mem, fillchar, MaxAvail[bank]);
+	if (f_overlay != NULL && bank <= MaxOverlayBank) {
+		fseek(f_overlay, bank*0x4000, SEEK_SET);
+		fread(mem, 1, MaxAvail[bank], f_overlay);
+	} else {
+		memset(mem, fillchar, MaxAvail[bank]);
+	}
 	MapfileInitBank(bank);

 	pSect = pSections;
 	while (pSect) {
 		if (pSect->Type == SECT_ROMX && pSect->nBank == bank) {
 			memcpy(mem + pSect->nOrg - 0x4000, pSect->pData,
-			    pSect->nByteSize);
+				pSect->nByteSize);
 			MapfileWriteSection(pSect);
 		}
 		pSect = pSect->pNext;
@@ -67,24 +80,57 @@ writebank(FILE * f, SLONG bank)
 	free(mem);
 }

-void 
+void
 out_Setname(char *tzOutputfile)
 {
 	tzOutname = tzOutputfile;
 }

-void 
+void
+out_SetOverlayname(char *tzOverlayfile)
+{
+	tzOverlayname = tzOverlayfile;
+}
+
+
+void
 Output(void)
 {
 	SLONG i;
 	FILE *f;
+	FILE *f_overlay = NULL;

 	if ((f = fopen(tzOutname, "wb"))) {
-		writehome(f);
+		if (tzOverlayname) {
+			f_overlay = fopen(tzOverlayname, "rb");
+			if (!f_overlay) {
+				fprintf(stderr, "Failed to open overlay file %s\n", tzOverlayname);
+				exit(1);
+			}
+			fseek(f_overlay, 0, SEEK_END);
+			if (ftell(f_overlay) % 0x4000 != 0) {
+				fprintf(stderr, "Overlay file must be aligned to 0x4000 bytes\n");
+				exit(1);
+			}
+			MaxOverlayBank = (ftell(f_overlay) / 0x4000) - 1;
+			if (MaxOverlayBank < 1) {
+				fprintf(stderr, "Overlay file be at least 0x8000 bytes\n");
+				exit(1);
+			}
+			if (MaxOverlayBank > MaxBankUsed) {
+				MaxBankUsed = MaxOverlayBank;
+			}
+		}
+
+		writehome(f, f_overlay);
 		for (i = 1; i <= MaxBankUsed; i += 1)
-			writebank(f, i);
+			writebank(f, f_overlay, i);

 		fclose(f);
+
+		if (tzOverlayname) {
+			fclose(f_overlay);
+		}
 	}
 	for (i = BANK_WRAM0; i < MAXBANKS; i++) {
 		struct sSection *pSect;
--- a/src/link/parser.y
+++ b/src/link/parser.y
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+%{
+#include <stdio.h>
+
+#include "extern/err.h"
+#include "link/script.h"
+
+int yylex();
+void yyerror(char *);
+
+extern int yylineno;
+%}
+
+%union { int i; char s[512]; }
+
+%token<i> INTEGER
+%token<s> STRING
+
+%token<s> SECTION_NONBANKED
+%token<s> SECTION_BANKED
+
+%token COMMAND_ALIGN
+%token COMMAND_ORG
+
+%token COMMAND_INCLUDE
+
+%token NEWLINE
+
+%start lines
+
+%%
+
+lines:
+	  /* empty */
+	| lines line NEWLINE
+	;
+
+line:
+	  /* empty */
+	| statement
+	;
+
+statement:
+	/* Statements to set the current section */
+	  SECTION_NONBANKED {
+		script_SetCurrentSectionType($1, 0);
+	}
+	| SECTION_NONBANKED INTEGER {
+		script_fatalerror("Trying to assign a bank to a non-banked section.\n");
+	}
+
+	| SECTION_BANKED {
+		script_fatalerror("Banked section without assigned bank.\n");
+	}
+	| SECTION_BANKED INTEGER {
+		script_SetCurrentSectionType($1, $2);
+	}
+
+	/* Commands to adjust the address inside the current section */
+	| COMMAND_ALIGN INTEGER {
+		script_SetAlignment($2);
+	}
+	| COMMAND_ALIGN {
+		script_fatalerror("ALIGN keyword needs an argument.\n");
+	}
+	| COMMAND_ORG INTEGER {
+		script_SetAddress($2);
+	}
+	| COMMAND_ORG {
+		script_fatalerror("ORG keyword needs an argument.\n");
+	}
+
+	/* Section name */
+	| STRING {
+		script_OutputSection($1);
+	}
+
+	/* Include file */
+	| COMMAND_INCLUDE STRING {
+		script_IncludeFile($2);
+	}
+
+	/* End */
+	;
+
+%%
+
+extern int yylex();
+extern int yyparse();
+
+int yywrap(void)
+{
+	if (script_IncludeDepthGet() == 0)
+		return 1;
+
+	script_IncludePop();
+
+	return 0;
+}
+
+void yyerror(char *s)
+{
+	script_fatalerror("Linkerscript parse error: \"%s\"\n", s);
+}
+
--- a/src/link/patch.c
+++ b/src/link/patch.c
@@ -13,19 +13,19 @@ SLONG rpnstack[256];
 SLONG rpnp;
 SLONG nPC;

-void 
+void
 rpnpush(SLONG i)
 {
 	rpnstack[rpnp++] = i;
 }

-SLONG 
+SLONG
 rpnpop(void)
 {
 	return (rpnstack[--rpnp]);
 }

-SLONG 
+SLONG
 getsymvalue(SLONG symid)
 {
 	switch (pCurrentSection->tSymbols[symid]->Type) {
@@ -51,7 +51,7 @@ getsymvalue(SLONG symid)
 	errx(1, "*INTERNAL* UNKNOWN SYMBOL TYPE");
 }

-SLONG 
+SLONG
 getsymbank(SLONG symid)
 {
 	SLONG nBank;
@@ -68,18 +68,21 @@ getsymbank(SLONG symid)
 		errx(1, "*INTERNAL* UNKNOWN SYMBOL TYPE");
 	}

-	if (nBank == BANK_WRAM0) return 0;
-	if (nBank >= BANK_WRAMX && nBank <= (BANK_WRAMX+6))
+	if (nBank == BANK_WRAM0 || nBank == BANK_ROM0 || nBank == BANK_OAM ||
+			nBank == BANK_HRAM) {
+		return 0;
+	} else if (nBank >= BANK_WRAMX && nBank < (BANK_WRAMX + BANK_COUNT_WRAMX)) {
 		return nBank - BANK_WRAMX + 1;
-	if (nBank >= BANK_VRAM && nBank <= (BANK_VRAM+1))
+	} else if (nBank >= BANK_VRAM && nBank < (BANK_VRAM + BANK_COUNT_VRAM)) {
 		return nBank - BANK_VRAM;
-	if (nBank >= BANK_SRAM && nBank <= (BANK_SRAM+3))
+	} else if (nBank >= BANK_SRAM && nBank < (BANK_SRAM + BANK_COUNT_SRAM)) {
 		return nBank - BANK_SRAM;
+	}

 	return nBank;
 }

-SLONG 
+SLONG
 calcrpn(struct sPatch * pPatch)
 {
 	SLONG t, size;
@@ -175,15 +178,6 @@ calcrpn(struct sPatch * pPatch)
 				    pPatch->pzFilename, pPatch->nLineNo);
 			}
 			break;
-		case RPN_PCEZP:
-			t = rpnpop();
-			rpnpush(t & 0xFF);
-			if (t < 0x2000 || t > 0x20FF) {
-				errx(1,
-				    "%s(%ld) : Value must be in the ZP area",
-				    pPatch->pzFilename, pPatch->nLineNo);
-			}
-			break;
 		case RPN_CONST:
 			/* constant */
 			t = (*rpn++);
@@ -212,35 +206,12 @@ calcrpn(struct sPatch * pPatch)
 			rpnpush(getsymbank(t));
 			size -= 4;
 			break;
-		case RPN_RANGECHECK:
-			{
-				SLONG low, high;
-
-				low = (*rpn++);
-				low |= (*rpn++) << 8;
-				low |= (*rpn++) << 16;
-				low |= (*rpn++) << 24;
-				high = (*rpn++);
-				high |= (*rpn++) << 8;
-				high |= (*rpn++) << 16;
-				high |= (*rpn++) << 24;
-				t = rpnpop();
-				if (t < low || t > high) {
-					errx(1,
-					    "%s(%ld) : Value must be in the range [%ld;%ld]",
-					    pPatch->pzFilename,
-					    pPatch->nLineNo, low, high);
-				}
-				rpnpush(t);
-				size -= 8;
-				break;
-			}
 		}
 	}
 	return (rpnpop());
 }

-void 
+void
 Patch(void)
 {
 	struct sSection *pSect;
@@ -270,22 +241,12 @@ Patch(void)
 				}
 				break;
 			case PATCH_WORD_L:
-			case PATCH_WORD_B:
 				if (t >= -32768 && t <= 65535) {
 					t &= 0xFFFF;
-					if (pPatch->Type == PATCH_WORD_L) {
-						pSect->pData[pPatch->nOffset] =
-						    t & 0xFF;
-						pSect->pData[pPatch->nOffset +
-						    1] =
-						    (t >> 8) & 0xFF;
-					} else {
-						//Assume big endian
-						    pSect->pData[pPatch->nOffset] =
-						    (t >> 8) & 0xFF;
-						pSect->pData[pPatch->nOffset +
-						    1] = t & 0xFF;
-					}
+					pSect->pData[pPatch->nOffset] =
+						t & 0xFF;
+					pSect->pData[pPatch->nOffset + 1] =
+						(t >> 8) & 0xFF;
 				} else {
 					errx(1,
 					    "%s(%ld) : Value must be 16-bit",
@@ -302,15 +263,6 @@ Patch(void)
 				pSect->pData[pPatch->nOffset + 3] =
 				    (t >> 24) & 0xFF;
 				break;
-			case PATCH_LONG_B:
-				pSect->pData[pPatch->nOffset + 0] =
-				    (t >> 24) & 0xFF;
-				pSect->pData[pPatch->nOffset + 1] =
-				    (t >> 16) & 0xFF;
-				pSect->pData[pPatch->nOffset + 2] =
-				    (t >> 8) & 0xFF;
-				pSect->pData[pPatch->nOffset + 3] = t & 0xFF;
-				break;
 			}

 			pPatch = pPatch->pNext;
--- a/src/link/rgblink.1
+++ b/src/link/rgblink.1
@@ -1,4 +1,18 @@
-.Dd February 26, 2015
+.\" Copyright © 2010 Anthony J. Bentley <anthony@anjbe.name>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 17, 2017
 .Dt RGBLINK 1
 .Os RGBDS Manual
 .Sh NAME
@@ -7,11 +21,15 @@
 .Sh SYNOPSIS
 .Nm rgblink
 .Op Fl t
+.Op Fl w
+.Op Fl d
 .Op Fl m Ar mapfile
 .Op Fl n Ar symfile
+.Op Fl O Ar overlayfile
 .Op Fl o Ar outfile
 .Op Fl p Ar pad_value
 .Op Fl s Ar symbol
+.Op Fl l Ar linkerscript
 .Ar
 .Sh DESCRIPTION
 The
@@ -26,12 +44,29 @@ If your ROM will only be 32KiB, you can use the
 .Fl t
 option to override this.
 .Pp
+Similarly, WRAM0 sections are placed in the first 4KiB of WRAM bank 0 and WRAMX
+sections are placed in any bank except bank 0.
+If your ROM doesn't use banked WRAM you can use option
+.Fl w
+option to override this.
+.Pp
+Also, if your ROM is designed for DMG, you can make sure that you don't use any
+prohibited section by using the option
+.Fl d ,
+which implies
+.Fl w
+but also prohibits the use of VRAM bank 1.
+.Pp
 The arguments are as follows:
 .Bl -tag -width Ds
 .It Fl m Ar mapfile
 Write a mapfile to the given filename.
 .It Fl n Ar symfile
 Write a symbol file to the given filename.
+.It Fl O Ar overlayfile
+The ROM image to overlay sections over.
+When an overlay ROM is provided, all sections must be fixed.
+This may be used to patch an existing binray.
 .It Fl o Ar outfile
 Write ROM image to the given filename.
 .It Fl p Ar pad_value
@@ -39,12 +74,27 @@ When padding an image, pad with this value.
 The default is 0x00.
 .It Fl s Ar symbol
 ???
+.It Fl w
+Expand the WRAM0 section size from 4KiB to the full 8KiB assigned to WRAM and
+prohibit the use of WRAMX sections.
+.It Fl d
+Enable DMG mode.
+Prohibit the use of sections that doesn't exist on a DMG, such as WRAMX and VRAM
+bank 1.
+This option automatically enables
+.Fl w .
 .It Fl t
-Write a tiny
-.Pq 32KiB
-ROM file.
-This forces all ROMX sections to be of type ROM0, and increases the ROM0
-section size from 16KiB to 32KiB.
+Expand the ROM0 section size from 16KiB to the full 32KiB assigned to ROM and
+prohibit the use of ROMX sections.
+Useful for ROMs that fit in 32 KiB.
+.It Fl l Ar linkerscript
+Specify a linkerscript file that tells the linker how sections must be placed in
+the ROM.
+This file has priority over the attributes assigned in the source code, but they
+have to be consistent.
+See
+.Xr rgblink 5
+for more information about its format.
 .El
 .Sh EXAMPLES
 All you need for a basic ROM is an object file, which can be made into a ROM
@@ -61,9 +111,12 @@ to fix these so that the program will actually run in a Game Boy:
 .D1 $ rgbfix -v bar.gb
 .Sh SEE ALSO
 .Xr rgbasm 1 ,
+.Xr rgblink 5 ,
 .Xr rgbfix 1 ,
+.Xr rgbds 5 ,
 .Xr rgbds 7
 .Sh HISTORY
 .Nm
 was originally written by Carsten S\(/orensen as part of the ASMotor package,
-and was later packaged in RGBDS by Justin Lloyd.
+and was later packaged in RGBDS by Justin Lloyd. It is now maintained by a
+number of contributors at https://github.com/rednex/rgbds.
--- a/src/link/rgblink.5
+++ b/src/link/rgblink.5
@@ -0,0 +1,101 @@
+.\" Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 17, 2017
+.Dt RGBLINK 5
+.Os RGBDS Manual
+.Sh NAME
+.Nm rgblink
+.Nd linkerscript file format
+.Sh DESCRIPTION
+The linkerscript is an external file that allows the user to specify the
+order of sections without the need for doing so before assembling each object
+file.
+.Pp
+The placement of sections specified in the linkerscript is done before the
+sections whose placement is defined in the source code.
+.Pp
+A linkerscript consists on a series of banks followed by a list of sections
+and, optionally, commands.
+They can be lowercase or uppercase, it is ignored.
+Any line can contain a comment starting with
+.Ql \&;
+that ends at the end of the line:
+.Pp
+.Bd -literal -offset indent
+ROMX $F ; This is a comment
+  "Functions to read array"
+  ALIGN 8
+  "Array aligned to 256 bytes"
+
+WRAMX 2
+  "Some variables"
+.Ed
+.Pp
+Numbers can be in decimal or hexadecimal format (the prefix is
+.Ql $ ) .
+It is an error if any bank or command is found before setting a bank.
+.Pp
+Files can be included by using the
+.Ar INCLUDE
+keyword followed by a string with the path of the file that has to be included.
+.Pp
+The possible bank types are:
+.Sy ROM0 , ROMX , VRAM , WRAM0 , WRAMX , OAM
+and
+.Sy HRAM .
+Types
+.Sy ROMX , VRAM , WRAMX
+and
+.Sy SRAM
+are banked, which means that it is needed to specify a bank after the type.
+.Pp
+When a new bank statement is found, sections found after it will be placed
+right from the beginning of that bank.
+If the linkerscript switches to a different bank and then it comes back to the
+previous one it will continue from the last address that was used.
+.Pp
+The only two commands are
+.Ar ORG
+and
+.Ar ALIGN :
+.Bl -bullet
+.It
+.Ar ORG
+sets the address in which new sections will be placed.
+It can not be lower than the current address.
+.It
+.Ar ALIGN
+will increase the address until it is aligned to the specified boundary (it
+tries to set to 0 the number of bits specified after the command:
+.Sy ALIGN 8
+will align to $100).
+.El
+.Pp
+Note: The bank, alignment, address and type of sections can be specified both
+in the source code and in the linkerscript.
+For a section to be able to be placed with the linkerscript the bank must be
+left unassigned in the source code or be the same as the one specified in the
+linkerscript. The address and alignment musn't be set.
+.Sh SEE ALSO
+.Xr rgbasm 1 ,
+.Xr rgblink 1 ,
+.Xr rgbfix 1 ,
+.Xr rgbds 5 ,
+.Xr rgbds 7
+.Sh HISTORY
+.Nm
+was originally written by Carsten S\(/orensen as part of the ASMotor package,
+and was later packaged in RGBDS by Justin Lloyd. It is now maintained by a
+number of contributors at https://github.com/rednex/rgbds.
--- a/src/link/script.c
+++ b/src/link/script.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright (C) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include "extern/err.h"
+#include "link/assign.h"
+#include "link/mylink.h"
+
+static struct {
+	unsigned int address; /* current address to write sections to */
+	unsigned int top_address; /* not inclusive */
+	enum eSectionType type;
+} bank[MAXBANKS];
+
+static int current_bank = -1; /* Bank as seen by the bank array */
+static int current_real_bank = -1; /* bank as seen by the GB */
+
+void script_InitSections(void)
+{
+	int i;
+	for (i = 0; i < MAXBANKS; i++) {
+		if (i == BANK_ROM0) {
+			/* ROM0 bank */
+			bank[i].address = 0x0000;
+			if (options & OPT_TINY) {
+				bank[i].top_address = 0x8000;
+			} else {
+				bank[i].top_address = 0x4000;
+			}
+			bank[i].type = SECT_ROM0;
+		} else if (i >= BANK_ROMX && i < BANK_ROMX + BANK_COUNT_ROMX) {
+			/* Swappable ROM bank */
+			bank[i].address = 0x4000;
+			bank[i].top_address = 0x8000;
+			bank[i].type = SECT_ROMX;
+		} else if (i == BANK_WRAM0) {
+			/* WRAM */
+			bank[i].address = 0xC000;
+			if (options & OPT_CONTWRAM) {
+				bank[i].top_address = 0xE000;
+			} else {
+				bank[i].top_address = 0xD000;
+			}
+			bank[i].type = SECT_WRAM0;
+		} else if (i >= BANK_SRAM && i < BANK_SRAM + BANK_COUNT_SRAM) {
+			/* Swappable SRAM bank */
+			bank[i].address = 0xA000;
+			bank[i].top_address = 0xC000;
+			bank[i].type = SECT_SRAM;
+		} else if (i >= BANK_WRAMX && i < BANK_WRAMX + BANK_COUNT_WRAMX) {
+			/* Swappable WRAM bank */
+			bank[i].address = 0xD000;
+			bank[i].top_address = 0xE000;
+			bank[i].type = SECT_WRAMX;
+		} else if (i >= BANK_VRAM && i < BANK_VRAM + BANK_COUNT_VRAM) {
+			/* Swappable VRAM bank */
+			bank[i].address = 0x8000;
+			bank[i].type = SECT_VRAM;
+			if (options & OPT_DMG_MODE && i != BANK_VRAM) {
+				/* In DMG the only available bank is bank 0. */
+				bank[i].top_address = 0x8000;
+			} else {
+				bank[i].top_address = 0xA000;
+			}
+		} else if (i == BANK_OAM) {
+			/* OAM */
+			bank[i].address = 0xFE00;
+			bank[i].top_address = 0xFEA0;
+			bank[i].type = SECT_OAM;
+		} else if (i == BANK_HRAM) {
+			/* HRAM */
+			bank[i].address = 0xFF80;
+			bank[i].top_address = 0xFFFF;
+			bank[i].type = SECT_HRAM;
+		} else {
+			errx(1, "(INTERNAL) Unknown bank type!");
+		}
+	}
+}
+
+void script_SetCurrentSectionType(const char *type, unsigned int bank)
+{
+	if (strcmp(type, "ROM0") == 0) {
+		if (bank != 0)
+			errx(1, "(Internal) Trying to assign a bank number to ROM0.\n");
+		current_bank = BANK_ROM0;
+		current_real_bank = 0;
+		return;
+	} else if (strcmp(type, "ROMX") == 0) {
+		if (bank == 0)
+			errx(1, "ROMX index can't be 0.\n");
+		if (bank > BANK_COUNT_ROMX)
+			errx(1, "ROMX index too big (%d > %d).\n", bank, BANK_COUNT_ROMX);
+		current_bank = BANK_ROMX + bank - 1;
+		current_real_bank = bank;
+		return;
+	} else if (strcmp(type, "VRAM") == 0) {
+		if (bank >= BANK_COUNT_VRAM)
+			errx(1, "VRAM index too big (%d >= %d).\n", bank, BANK_COUNT_VRAM);
+		current_bank = BANK_VRAM + bank;
+		current_real_bank = bank;
+		return;
+	} else if (strcmp(type, "WRAM0") == 0) {
+		if (bank != 0)
+			errx(1, "(Internal) Trying to assign a bank number to WRAM0.\n");
+		current_bank = BANK_WRAM0;
+		current_real_bank = 0;
+		return;
+	} else if (strcmp(type, "WRAMX") == 0) {
+		if (bank == 0)
+			errx(1, "WRAMX index can't be 0.\n");
+		if (bank > BANK_COUNT_WRAMX)
+			errx(1, "WRAMX index too big (%d > %d).\n", bank, BANK_COUNT_WRAMX);
+		current_bank = BANK_WRAMX + bank - 1;
+		current_real_bank = bank - 1;
+		return;
+	} else if (strcmp(type, "SRAM") == 0) {
+		if (bank >= BANK_COUNT_SRAM)
+			errx(1, "SRAM index too big (%d >= %d).\n", bank, BANK_COUNT_SRAM);
+		current_bank = BANK_SRAM + bank;
+		current_real_bank = bank;
+		return;
+	} else if (strcmp(type, "OAM") == 0) {
+		if (bank != 0)
+			errx(1, "(Internal) Trying to assign a bank number to OAM.\n");
+		current_bank = BANK_OAM;
+		current_real_bank = 0;
+		return;
+	} else if (strcmp(type, "HRAM") == 0) {
+		if (bank != 0)
+			errx(1, "(Internal) Trying to assign a bank number to HRAM.\n");
+		current_bank = BANK_HRAM;
+		current_real_bank = 0;
+		return;
+	}
+
+	errx(1, "(Internal) Unknown section type \"%s\".\n", type);
+}
+
+void script_SetAddress(unsigned int addr)
+{
+	if (current_bank == -1) {
+		errx(1, "Trying to set an address without assigned bank\n");
+	}
+
+	/* Make sure that we don't go back. */
+	if (bank[current_bank].address > addr) {
+		errx(1, "Trying to go to a previous address (0x%04X to 0x%04X)\n",
+			bank[current_bank].address, addr);
+	}
+
+	bank[current_bank].address = addr;
+
+	/* Make sure we don't overflow */
+	if (bank[current_bank].address >= bank[current_bank].top_address) {
+		errx(1, "Bank overflowed (0x%04X >= 0x%04X)\n",
+			bank[current_bank].address, bank[current_bank].top_address);
+	}
+}
+
+void script_SetAlignment(unsigned int alignment)
+{
+	if (current_bank == -1) {
+		errx(1, "Trying to set an alignment without assigned bank\n");
+	}
+
+	if (alignment > 15) {
+		errx(1, "Trying to set an alignment too big: %d\n", alignment);
+	}
+
+	unsigned int size = 1 << alignment;
+	unsigned int mask = size - 1;
+
+	if (bank[current_bank].address & mask) {
+		bank[current_bank].address &= ~mask;
+		bank[current_bank].address += size;
+	}
+
+	/* Make sure we don't overflow */
+	if (bank[current_bank].address >= bank[current_bank].top_address) {
+		errx(1, "Bank overflowed (0x%04X >= 0x%04X)\n",
+			bank[current_bank].address, bank[current_bank].top_address);
+	}
+}
+
+void script_OutputSection(const char *section_name)
+{
+	if (current_bank == -1) {
+		errx(1, "Trying to place section \"%s\" without assigned bank\n", section_name);
+	}
+
+	if (!IsSectionSameTypeBankAndFloating(section_name, bank[current_bank].type,
+						current_real_bank)) {
+		errx(1, "Different attributes for \"%s\" in source and linkerscript\n",
+			section_name);
+	}
+
+	/* Move section to its place. */
+	bank[current_bank].address +=
+		AssignSectionAddressAndBankByName(section_name,
+				bank[current_bank].address, current_real_bank);
+}
+
--- a/src/link/symbol.c
+++ b/src/link/symbol.c
@@ -19,7 +19,7 @@ struct ISymbol {

 struct ISymbol *tHash[HASHSIZE];

-SLONG 
+SLONG
 calchash(char *s)
 {
 	SLONG r = 0;
@@ -29,7 +29,7 @@ calchash(char *s)
 	return (r % HASHSIZE);
 }

-void 
+void
 sym_Init(void)
 {
 	SLONG i;
@@ -37,7 +37,7 @@ sym_Init(void)
 		tHash[i] = NULL;
 }

-SLONG 
+SLONG
 sym_GetValue(char *tzName)
 {
 	if (strcmp(tzName, "@") == 0) {
@@ -58,7 +58,7 @@ sym_GetValue(char *tzName)
 	}
 }

-SLONG 
+SLONG
 sym_GetBank(char *tzName)
 {
 	struct ISymbol **ppSym;
@@ -75,7 +75,7 @@ sym_GetBank(char *tzName)
 	errx(1, "Unknown symbol '%s'", tzName);
 }

-void 
+void
 sym_CreateSymbol(char *tzName, SLONG nValue, SLONG nBank)
 {
 	if (strcmp(tzName, "@") == 0)
--- a/src/rgbds.5
+++ b/src/rgbds.5
@@ -0,0 +1,190 @@
+.\" Copyright (c) 2017 Antonio Nino Diaz <antonio_nd@outlook.com>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 17, 2017
+.Dt RGBDS 5
+.Os RGBDS Manual
+.Sh NAME
+.Nm rgbds
+.Nd object file format documentation
+.Sh DESCRIPTION
+This is the description of the object files used by
+.Xr rgbasm 1
+and
+.Xr rgblink 1 .
+Please, note that the specifications may change.
+This toolchain is in development and new features may require adding more
+information to the current format, or modifying some fields, which would break
+compatibility with older versions.
+.Pp
+.Sh FILE STRUCTURE
+The following types are used:
+.Pp
+.Ar LONG
+is a 32‐bit integer stored in little‐endian format (Intel).
+.Ar BYTE
+is an 8‐bit integer.
+.Ar STRING
+is a 0‐terminated string of
+.Ar BYTE .
+.Pp
+.Bd -literal
+; Header
+
+BYTE    ID[4]            ; "RGB4"
+LONG    NumberOfSymbols  ; The number of symbols used in this file
+LONG    NumberOfSections ; The number of sections used in this file
+
+; Symbols
+
+REPT    NumberOfSymbols   ; Number of symbols defined in this object file.
+
+    STRING  Name          ; The name of this symbol. Local symbols are stored
+                          ; as "Scope.Symbol".
+
+    BYTE    Type          ; 0 = LOCAL symbol only used in this file.
+                          ; 1 = IMPORT this symbol from elsewhere (unused).
+                          ; 2 = EXPORT this symbol to other objects.
+
+    IF      Type != 1     ; If symbol is defined in this object file.
+
+        LONG    SectionID ; The section number (of this object file) in which
+                          ; this symbol is defined.
+
+        LONG    Value     ; The symbols value. It's the offset into that
+                          ; symbol's section.
+
+    ENDC
+
+ENDR
+
+; Sections
+
+REPT NumberOfSections
+    STRING  Name  ; Name of the section
+
+    LONG    Size  ; Size in bytes of this section
+
+    BYTE    Type  ; 0 = WRAM0
+                  ; 1 = VRAM
+                  ; 2 = ROMX
+                  ; 3 = ROM0
+                  ; 4 = HRAM
+                  ; 5 = WRAMX
+                  ; 6 = SRAM
+                  ; 7 = OAM
+
+    LONG    Org   ; Address to fix this section at. -1 if the linker should
+                  ; decide (floating address).
+
+    LONG    Bank  ; Bank to load this section into. -1 if the linker should
+                  ; decide (floating bank). This field is only valid for ROMX,
+                  ; VRAM, WRAMX and SRAM sections.
+
+    LONG    Align ; Alignment of this section (expressed as number of low bits
+                  ; to leave as 0). -1 if not defined.
+
+    IF      (Type == ROMX) || (Type == ROM0) ; Sections that can contain data.
+
+        BYTE    Data[Size]      ; Raw data of the section.
+
+        LONG    NumberOfPatches ; Number of patches to apply.
+
+        ; These types of sections may have patches
+
+        REPT    NumberOfPatches
+
+            STRING  SourceFile   ; Name of the source file (for printing error
+                                 ; messages).
+
+            LONG    Line         ; The line of the source file.
+
+            LONG    Offset       ; Offset into the section where patch should
+                                 ; be applied (in bytes).
+
+            BYTE    Type         ; 0 = BYTE patch.
+                                 ; 1 = little endian WORD patch.
+                                 ; 2 = little endian LONG patch.
+
+            LONG    RPNSize      ; Size of the buffer with the RPN.
+                                 ; expression.
+
+            BYTE    RPN[RPNSize] ; RPN expression. Definition below.
+
+        ENDR
+
+    ENDC
+
+ENDR
+.Ed
+.Ss RPN DATA
+Expressions in the object file are stored as RPN.
+This is an expression of the form
+.Do 2 5 + Dc .
+This will first push the value
+.Do 2 Dc to the stack.
+Then
+.Do 5 Dc .
+The
+.Do + Dc operator pops two arguments from the stack, adds them, and then pushes
+the result on the stack, effectively replacing the two top arguments with their
+sum.
+In the RGB format, RPN expressions are stored as BYTEs with some bytes being
+special prefixes for integers and symbols.
+.Pp
+.Bl -column -offset indent ".Sy String" ".Sy String"
+.It Sy Value Ta Sy Meaning
+.It Li $00 Ta Li + operator
+.It Li $01 Ta Li - operator
+.It Li $02 Ta Li * operator
+.It Li $03 Ta Li / operator
+.It Li $04 Ta Li % operator
+.It Li $05 Ta Li unary -
+.It Li $06 Ta Li | operator
+.It Li $07 Ta Li & operator
+.It Li $08 Ta Li ^ operator
+.It Li $09 Ta Li unary ~
+.It Li $0A Ta Li && comparison
+.It Li $0B Ta Li || comparison
+.It Li $0C Ta Li unary !
+.It Li $0D Ta Li == comparison
+.It Li $0E Ta Li != comparison
+.It Li $0F Ta Li > comparison
+.It Li $10 Ta Li < comparison
+.It Li $11 Ta Li >= comparison
+.It Li $12 Ta Li <= comparison
+.It Li $13 Ta Li << comparison
+.It Li $14 Ta Li >> comparison
+.It Li $15 Ta Li BANK()
+function.
+A symbol ID follows.
+.It Li $16 Ta Li HRAMCheck.
+Check if the value is in HRAM, AND it with 0xFF.
+.It Li $80 Ta Ar LONG
+integer follows.
+.It Li $81 Ta Ar LONG
+Symbol ID follows.
+.El
+.Pp
+.Sh SEE ALSO
+.Xr rgbasm 1 ,
+.Xr rgblink 1 ,
+.Xr rgbds 7 ,
+.Xr gbz80 7
+.Sh HISTORY
+.Nm rgbds
+was originally written by Carsten S\(/orensen as part of the ASMotor package,
+and was later packaged in RGBDS by Justin Lloyd.
+It is now maintained by a number of contributors at
+https://github.com/rednex/rgbds.
--- a/src/rgbds.7
+++ b/src/rgbds.7
@@ -1,4 +1,18 @@
-.Dd $Mdocdate$
+.\" Copyright © 2010 Anthony J. Bentley <anthony@anjbe.name>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.Dd April 17, 2017
 .Dt RGBDS 7
 .Os RGBDS Manual
 .Sh NAME
@@ -14,8 +28,24 @@ To get a working ROM image from a single assembly source file:
 .Xr rgbasm 1 ,
 .Xr rgbfix 1 ,
 .Xr rgblink 1 ,
+.Xr rgbds 5 ,
 .Xr gbz80 7
 .Sh HISTORY
-.Nm
-grew out of the ASMotor package released by Carsten S\(/orensen.
-It was first released as a Game Boy software package by Justin Lloyd.
+.Bl -ohang
+.It
+1997, Carsten S\(/orensen (AKA SurfSmurf) writes ASMotor as a general-purpose
+assembler/linker system for DOS/Win32.
+.It
+1999, Justin Lloyd (AKA Otaku no Zoku) adapts ASMotor to read and produce GBZ80
+assembly/machine code, and releases this version as RGBDS.
+.It
+2009, Vegard Nossum adapts the code to be more UNIX-like and releases this
+version as rgbds-linux on GitHub.
+.It
+2010, Anthony J. Bentley forks that repository. The fork becomes the reference
+implementation of rgbds.
+.It
+2017, Bentley's repository is moved to a neutral name.
+It is now maintained by a number of contributors at
+https://github.com/rednex/rgbds
+.El
--- a/test/asm/bank-noexist.out
+++ b/test/asm/bank-noexist.out
@@ -1,2 +0,0 @@
-ERROR:	bank-noexist.asm(2) :
-	'noexist' not defined
--- a/test/asm/divzero-instr.out
+++ b/test/asm/divzero-instr.out
@@ -1,2 +1,2 @@
-ERROR:	divzero-instr.asm(2) :
+ERROR: divzero-instr.asm(2):
 	division by zero
--- a/test/asm/divzero-section-bank.out
+++ b/test/asm/divzero-section-bank.out
@@ -1,2 +1,2 @@
-ERROR:	divzero-section-bank.asm(1) :
+ERROR: divzero-section-bank.asm(1):
 	division by zero
--- a/test/asm/macro-@.out
+++ b/test/asm/macro-@.out
@@ -1,2 +1,2 @@
-ERROR:	macro-@.asm(1) -> @(-1) :
+ERROR: macro-@.asm(1) -> @(-1):
 	Macro '@' not defined
--- a/test/asm/null-in-macro.out
+++ b/test/asm/null-in-macro.out
@@ -0,0 +1,2 @@
+ERROR: null-in-macro.asm(1):
+	Unterminated MACRO definition
--- a/test/asm/test.sh
+++ b/test/asm/test.sh
@@ -1,6 +1,10 @@
 fname=$(mktemp)
+rc=0

 for i in *.asm; do
 	../../rgbasm $i >$fname 2>&1
 	diff -u $fname ${i%.asm}.out
+	rc=$(($? || $rc))
 done
+
+exit $rc
--- a/test/asm/undefined-dot.out
+++ b/test/asm/undefined-dot.out
@@ -1,2 +1,3 @@
-ERROR:	undefined-dot.asm(3) :
+ERROR: undefined-dot.asm(3):
 	'.' not defined
+error: Assembly aborted in pass 2 (1 errors)!
--- a/test/asm/update-refs.sh
+++ b/test/asm/update-refs.sh
@@ -0,0 +1,8 @@
+fname=$(mktemp)
+
+for i in *.asm; do
+	../../rgbasm $i >$fname 2>&1
+	mv -f $fname ${i%.asm}.out
+done
+
+exit 0
--- a/test/link/bank-numbers.asm
+++ b/test/link/bank-numbers.asm
@@ -0,0 +1,53 @@
+section "x",rom0[$0000]
+	db bank(r0),bank(r1),bank(r2),bank(r3) ; Should be enough
+	db bank(v0),bank(v1)
+	db bank(w0),bank(w1),bank(w2),bank(w3),bank(w4),bank(w5),bank(w6),bank(w7)
+	db bank(s0),bank(s1),bank(s2),bank(s3) ; Should be enough
+	db bank(o0)
+	db bank(h0)
+
+section "r0",rom0
+r0:
+section "r1",romx,bank[1]
+r1:
+section "r2",romx,bank[2]
+r2:
+section "r3",romx,bank[3]
+r3:
+
+section "v0",vram,bank[0]
+v0:
+section "v1",vram,bank[1]
+v1:
+
+section "s0",sram,bank[0]
+s0:
+section "s1",sram,bank[1]
+s1:
+section "s2",sram,bank[2]
+s2:
+section "s3",sram,bank[3]
+s3:
+
+section "w0",wram0
+w0:
+section "w1",wramx,bank[1]
+w1:
+section "w2",wramx,bank[2]
+w2:
+section "w3",wramx,bank[3]
+w3:
+section "w4",wramx,bank[4]
+w4:
+section "w5",wramx,bank[5]
+w5:
+section "w6",wramx,bank[6]
+w6:
+section "w7",wramx,bank[7]
+w7:
+
+section "o0",oam
+o0:
+
+section "h0",hram
+h0:
--- a/test/link/bank-numbers.out
+++ b/test/link/bank-numbers.out
--- a/test/link/bank-numbers.out.bin
+++ b/test/link/bank-numbers.out.bin
--- a/test/link/high-low-a.asm
+++ b/test/link/high-low-a.asm
@@ -0,0 +1,22 @@
+ldhilo : MACRO
+    ld  HIGH(\1),LOW(\2)
+ENDM
+
+SECTION "r0", ROM0[$0]
+ld HIGH(af),a
+ld HIGH(bc),LOW(bc)
+ld LOW(bc),HIGH(bc)
+ld HIGH(de),LOW(de)
+ld LOW(de),HIGH(de)
+    ldhilo hl, hl
+ld LOW(hl),HIGH(hl)
+
+db HIGH(label+$AB)
+db LOW(label+$AB)
+
+db HIGH($1234)
+db LOW($1234)
+
+SECTION "o",OAM
+DS $10
+label:
--- a/test/link/high-low-b.asm
+++ b/test/link/high-low-b.asm
@@ -0,0 +1,18 @@
+SECTION "r0", ROM0[$0]
+ld a,a
+ld b,c
+ld c,b
+ld d,e
+ld e,d
+ld h,l
+ld l,h
+
+db ((label+$AB) >> 8) & $FF
+db (label+$AB) & $FF
+
+db ($1234 >> 8) & $FF
+db $1234 & $FF
+
+SECTION "o",OAM
+DS $10
+label:
--- a/test/link/ram-bank-numbers.asm
+++ b/test/link/ram-bank-numbers.asm
@@ -1,36 +0,0 @@
-; this should generate a rom consisting of the following bytes:
-; 01 02 03 04 05 06 07 00 01 02 03 00 01
-
-section "x",rom0
-	db bank(w1),bank(w2),bank(w3),bank(w4),bank(w5),bank(w6),bank(w7)
-	db bank(s0),bank(s1),bank(s2),bank(s3)
-	db bank(v0),bank(v1)
-
-section "wa",wramx,bank[1]
-w1:
-section "wb",wramx,bank[2]
-w2:
-section "wc",wramx,bank[3]
-w3:
-section "wd",wramx,bank[4]
-w4:
-section "we",wramx,bank[5]
-w5:
-section "wf",wramx,bank[6]
-w6:
-section "wg",wramx,bank[7]
-w7:
-
-section "sa",sram,bank[0]
-s0:
-section "sb",sram,bank[1]
-s1:
-section "sc",sram,bank[2]
-s2:
-section "sd",sram,bank[3]
-s3:
-
-section "v00",vram,bank[0]
-v0:
-section "v01",vram,bank[1]
-v1:
--- a/test/link/romx-tiny-no-t.out
+++ b/test/link/romx-tiny-no-t.out
@@ -0,0 +1 @@
+error: Unable to place 'r0b' (ROM0 section) anywhere
--- a/test/link/romx-tiny-t.out
+++ b/test/link/romx-tiny-t.out
@@ -0,0 +1 @@
+error: ROMX sections can't be used with option -t.
--- a/test/link/romx-tiny.asm
+++ b/test/link/romx-tiny.asm
@@ -0,0 +1,8 @@
+SECTION "r0a", ROM0
+DS $4000
+
+SECTION "rx", ROMX
+DS $4000
+
+SECTION "r0b", ROM0
+DS $4000
--- a/test/link/test.sh
+++ b/test/link/test.sh
@@ -0,0 +1,57 @@
+otemp=$(mktemp)
+gbtemp=$(mktemp)
+gbtemp2=$(mktemp)
+outtemp=$(mktemp)
+rc=0
+
+RGBASM=../../rgbasm
+RGBLINK=../../rgblink
+
+$RGBASM -o $otemp bank-numbers.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff bank-numbers.out $outtemp
+rc=$(($? || $rc))
+head -c 20 $gbtemp > $otemp 2>&1
+diff bank-numbers.out.bin $otemp
+rc=$(($? || $rc))
+
+$RGBASM -o $otemp wramx-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff wramx-dmg-mode-no-d.out $outtemp
+rc=$(($? || $rc))
+$RGBLINK -d -o $gbtemp $otemp > $outtemp 2>&1
+diff wramx-dmg-mode-d.out $outtemp
+rc=$(($? || $rc))
+
+$RGBASM -o $otemp vram-fixed-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-fixed-dmg-mode-no-d.out $outtemp
+rc=$(($? || $rc))
+$RGBLINK -d -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-fixed-dmg-mode-d.out $outtemp
+rc=$(($? || $rc))
+
+$RGBASM -o $otemp vram-floating-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-floating-dmg-mode-no-d.out $outtemp
+rc=$(($? || $rc))
+$RGBLINK -d -o $gbtemp $otemp > $outtemp 2>&1
+diff vram-floating-dmg-mode-d.out $outtemp
+rc=$(($? || $rc))
+
+$RGBASM -o $otemp romx-tiny.asm
+$RGBLINK -o $gbtemp $otemp > $outtemp 2>&1
+diff romx-tiny-no-t.out $outtemp
+rc=$(($? || $rc))
+$RGBLINK -t -o $gbtemp $otemp > $outtemp 2>&1
+diff romx-tiny-t.out $outtemp
+rc=$(($? || $rc))
+
+$RGBASM -o $otemp high-low-a.asm
+$RGBLINK -o $gbtemp $otemp
+$RGBASM -o $otemp high-low-b.asm
+$RGBLINK -o $gbtemp2 $otemp
+diff $gbtemp $gbtemp2
+rc=$(($? || $rc))
+
+exit $rc
--- a/test/link/update-refs.sh
+++ b/test/link/update-refs.sh
@@ -0,0 +1,27 @@
+otemp=$(mktemp)
+gbtemp=$(mktemp)
+
+RGBASM=../../rgbasm
+RGBLINK=../../rgblink
+
+$RGBASM -o $otemp bank-numbers.asm
+$RGBLINK -o $gbtemp $otemp > bank-numbers.out 2>&1
+head -c 20 $gbtemp > bank-numbers.out.bin 2>&1
+
+$RGBASM -o $otemp wramx-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > wramx-dmg-mode-no-d.out 2>&1
+$RGBLINK -d -o $gbtemp $otemp > wramx-dmg-mode-d.out 2>&1
+
+$RGBASM -o $otemp vram-fixed-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > vram-fixed-dmg-mode-no-d.out 2>&1
+$RGBLINK -d -o $gbtemp $otemp > vram-fixed-dmg-mode-d.out 2>&1
+
+$RGBASM -o $otemp vram-floating-dmg-mode.asm
+$RGBLINK -o $gbtemp $otemp > vram-floating-dmg-mode-no-d.out 2>&1
+$RGBLINK -d -o $gbtemp $otemp > vram-floating-dmg-mode-d.out 2>&1
+
+$RGBASM -o $otemp romx-tiny.asm
+$RGBLINK -o $gbtemp $otemp > romx-tiny-no-t.out 2>&1
+$RGBLINK -t -o $gbtemp $otemp > romx-tiny-t.out 2>&1
+
+exit 0
--- a/test/link/vram-fixed-dmg-mode-d.out
+++ b/test/link/vram-fixed-dmg-mode-d.out
@@ -0,0 +1 @@
+error: VRAM bank 1 can't be used with option -w.
--- a/test/link/vram-fixed-dmg-mode-no-d.out
+++ b/test/link/vram-fixed-dmg-mode-no-d.out
--- a/test/link/vram-fixed-dmg-mode.asm
+++ b/test/link/vram-fixed-dmg-mode.asm
@@ -0,0 +1,6 @@
+SECTION "v0", VRAM, BANK[0]
+DS $2000
+
+SECTION "v1", VRAM, BANK[1]
+DS $2000
+
--- a/test/link/vram-floating-dmg-mode-d.out
+++ b/test/link/vram-floating-dmg-mode-d.out
@@ -0,0 +1 @@
+error: Unable to place 'v1' (VRAM section) in any bank
--- a/test/link/vram-floating-dmg-mode-no-d.out
+++ b/test/link/vram-floating-dmg-mode-no-d.out
--- a/test/link/vram-floating-dmg-mode.asm
+++ b/test/link/vram-floating-dmg-mode.asm
@@ -0,0 +1,6 @@
+SECTION "v0", VRAM
+DS $2000
+
+SECTION "v1", VRAM
+DS $2000
+
--- a/test/link/wramx-dmg-mode-d.out
+++ b/test/link/wramx-dmg-mode-d.out
@@ -0,0 +1 @@
+error: WRAMX sections can't be used with option -w.
--- a/test/link/wramx-dmg-mode-no-d.out
+++ b/test/link/wramx-dmg-mode-no-d.out
@@ -0,0 +1 @@
+error: Unable to place 'w0b' (WRAM0 section) anywhere
--- a/test/link/wramx-dmg-mode.asm
+++ b/test/link/wramx-dmg-mode.asm
@@ -0,0 +1,8 @@
+SECTION "w0a", WRAM0
+DS $1000
+
+SECTION "wx", WRAMX
+DS $1000
+
+SECTION "w0b", WRAM0
+DS $1000
				`@@ -0,0 +1 @@`
				`error: Unable to place 'r0b' (ROM0 section) anywhere`
				`@@ -0,0 +1 @@`
				`error: ROMX sections can't be used with option -t.`
				`@@ -0,0 +1 @@`
				`error: VRAM bank 1 can't be used with option -w.`
				`@@ -0,0 +1 @@`
				`error: Unable to place 'v1' (VRAM section) in any bank`
				`@@ -0,0 +1 @@`
				`error: WRAMX sections can't be used with option -w.`
				`@@ -0,0 +1 @@`
				`error: Unable to place 'w0b' (WRAM0 section) anywhere`