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Overhaul RGBDS man pages and help messages

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.\"
.\" This file is part of RGBDS.
.\"
.\" Copyright (c) 2010-2018, Anthony J. Bentley and RGBDS contributors.
.\" Copyright (c) 2010-2019, Anthony J. Bentley and RGBDS contributors.
.\"
.\" SPDX-License-Identifier: MIT
.\"
.Dd January 26, 2018
.Dd November 26, 2019
.Dt RGBLINK 1
.Os RGBDS Manual
.Os
.Sh NAME
.Nm rgblink
.Nd Game Boy linker
.Sh SYNOPSIS
.Nm rgblink
.Op Fl dtVw
.Op Fl m Ar mapfile
.Op Fl n Ar symfile
.Op Fl O Ar overlayfile
.Op Fl o Ar outfile
.Nm
.Op Fl dtVvw
.Op Fl l Ar linker_script
.Op Fl m Ar map_file
.Op Fl n Ar sym_file
.Op Fl O Ar overlay_file
.Op Fl o Ar out_file
.Op Fl p Ar pad_value
.Op Fl s Ar symbol
.Op Fl l Ar linkerscript
.Ar
.Sh DESCRIPTION
The
.Nm
program links objects created by
.Xr rgbasm 1
program links RGB object files, typically created by
.Xr rgbasm 1 ,
into a single Game Boy ROM file.
The format is documented in
.Xr rgbds 5 .
.Pp
By default, ROM0 sections created by the assembler are placed in the 16KiB
bank 0, and ROMX sections are placed in any bank except bank 0.
If your ROM will only be 32KiB, you can use the
ROM0 sections are placed in the first 16 KiB of the output ROM, and ROMX sections are placed in any 16 KiB
.Dq bank
except the first.
If your ROM will only be 32 KiB, you can use the
.Fl t
option to override this.
option to change 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
Similarly, WRAM0 sections are placed in the first 4 KiB of WRAM
.Pq Dq bank 0 ,
and WRAMX sections are placed in any bank of the last 4 KiB.
If your ROM doesn't use banked, WRAM you can use the
.Fl w
option to override this.
option to change 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
Also, if your ROM is designed for a monochrome Game Boy, you can make sure that you don't use any incompatible section by using the
.Fl d
option, which implies
.Fl w
but also prohibits the use of VRAM bank 1.
but also prohibits the use of banked VRAM.
.Pp
Note that options can be abbreviated as long as the abbreviation is unambiguous:
.Fl Fl verb
is
.Fl Fl verbose ,
but
.Fl Fl ver
is invalid because it could also be
.Fl Fl version .
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 binary.
.It Fl o Ar outfile
Write ROM image to the given filename.
.It Fl p Ar pad_value
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
.It Fl d , Fl Fl dmg
Enable DMG mode.
Prohibit the use of sections that doesn't exist on a DMG, such as WRAMX and VRAM
bank 1.
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
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.
.It Fl l Ar linker_script, Fl Fl linkerscript Ar linker_script
Specify a linker script file that tells the linker how sections must be placed in the ROM.
The attributes assigned in the linker script must be consistent with any assigned in the code.
See
.Xr rgblink 5
for more information about its format.
.It Fl V
for more information about the linker script format.
.It Fl m Ar map_file , Fl Fl map Ar map_file
Write a map file to the given filename, listing how sections and symbols were assigned.
.It Fl n Ar sym_file , Fl Fl sym Ar sym_file
Write a symbol file to the given filename, listing the address of all exported symbols.
Several external programs can use this information, for example to help debugging ROMs.
.It Fl O Ar overlay_file , Fl Fl overlay Ar overlay_file
If specified, sections will be overlaid "on top" of the provided ROM image.
In that case, all sections must be fixed.
This may be used to patch an existing binary.
.It Fl o Ar out_file , Fl Fl output Ar out_file
Write the ROM image to the given file.
.It Fl p Ar pad_value , Fl Fl pad Ar pad_value
When inserting padding between sections, pad with this value.
Has no effect if
.Fl O
is specified.
The default is 0.
.It Fl s Ar symbol , Fl Fl smart Ar symbol
This option is ignored.
It was supposed to perform smart linking but fell into disrepair, and so has been removed.
It will be reimplemented at some point.
.It Fl t , Fl tiny
Expand the ROM0 section size from 16 KiB to the full 32 KiB assigned to ROM and prohibit the use of ROMX sections.
Useful for ROMs that fit in 32 KiB.
.It Fl V , Fl version
Print the version of the program and exit.
.It Fl v , Fl verbose
Verbose: enable printing more information to standard error.
.It Fl w , Fl wramx
Expand the WRAM0 section size from 4 KiB to the full 8 KiB assigned to WRAM and prohibit the use of WRAMX sections.
.El
.Sh EXAMPLES
All you need for a basic ROM is an object file, which can be made into a ROM
image like so:
All you need for a basic ROM is an object file, which can be made into a ROM image like so:
.Pp
.D1 $ rgblink -o bar.gb foo.o
.Pp
The resulting bar.gb will not have correct checksums
.Pq unless you put them in the assembly source .
The resulting
.Ar bar.gb
will not have correct checksums (unless you put them in the assembly source).
You should use
.Xr rgbfix 1
to fix these so that the program will actually run in a Game Boy:
.Pp
.D1 $ rgbfix -v bar.gb
.Pp
Here is a more complete example:
.Pp
.D1 $ rgblink -o bin/game.gb -n bin/game.sym -p 0xFF obj/title.o obj/engine.o
.Sh BUGS
Please report bugs on
.Lk https://github.com/rednex/rgbds/issues GitHub .
.Sh SEE ALSO
.Xr rgbasm 1 ,
.Xr rgblink 5 ,
@@ -110,7 +131,6 @@ to fix these so that the program will actually run in a Game Boy:
.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
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
.Lk https://github.com/rednex/rgbds .