Add support for OAM Sections

Allows sections (and labels within) to be defined that correspond to the Game Boy’s Object Attributes Memory.

include/asm/mylink.h

@@ -101,7 +101,8 @@ enum {
 	SECT_ROM0,
 	SECT_HRAM,
 	SECT_WRAMX,
-	SECT_SRAM
+	SECT_SRAM,
+	SECT_OAM
 };
 
 enum {

include/link/assign.h

@@ -9,6 +9,7 @@ enum eBankCount {
 	BANK_COUNT_WRAM0 = 1,
 	BANK_COUNT_WRAMX = 7,
 	BANK_COUNT_VRAM = 2,
+	BANK_COUNT_OAM  = 1,
 	BANK_COUNT_HRAM = 1,
 	BANK_COUNT_SRAM = 16
 };
@@ -19,12 +20,13 @@ enum eBankDefine {
 	BANK_WRAM0 = BANK_ROMX  + BANK_COUNT_ROMX,
 	BANK_WRAMX = BANK_WRAM0 + BANK_COUNT_WRAM0,
 	BANK_VRAM  = BANK_WRAMX + BANK_COUNT_WRAMX,
-	BANK_HRAM  = BANK_VRAM  + BANK_COUNT_VRAM,
+	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);

include/link/mylink.h

@@ -57,7 +57,8 @@ enum eSectionType {
 	SECT_ROM0,
 	SECT_HRAM,
 	SECT_WRAMX,
-	SECT_SRAM
+	SECT_SRAM,
+	SECT_OAM
 };
 
 struct sSection {

src/asm/asmy.y

@@ -513,7 +513,7 @@ 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_Z80_ADC T_Z80_ADD T_Z80_AND
 %token	T_Z80_BIT
@@ -1146,6 +1146,7 @@ sectiontype:
 	|	T_SECT_HRAM	{ $$=SECT_HRAM; }
 	|	T_SECT_WRAMX	{ $$=SECT_WRAMX; }
 	|	T_SECT_SRAM	{ $$=SECT_SRAM; }
+	|	T_SECT_OAM	{ $$=SECT_OAM; }
 ;
 
 

src/asm/globlex.c

@@ -342,6 +342,7 @@ struct sLexInitString staticstrings[] = {
 	{"hram", T_SECT_HRAM},
 	{"wramx", T_SECT_WRAMX},
 	{"sram", T_SECT_SRAM},
+	{"oam", T_SECT_OAM},
 
 	{NAME_RB, T_POP_RB},
 	{NAME_RW, T_POP_RW},

src/asm/output.c

@@ -491,7 +491,7 @@ out_WriteObject(void)
 		struct PatchSymbol *pSym;
 		struct Section *pSect;
 
-		fwrite("RGB3", 1, 4, f);
+		fwrite("RGB4", 1, 4, f);
 		fputlong(countsymbols(), f);
 		fputlong(countsections(), f);
 

src/link/assign.c

@@ -30,7 +30,7 @@ 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 +38,8 @@ 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) { \
@@ -326,6 +327,9 @@ AssignSections(void)
 			/* Swappable VRAM bank */
 			BankFree[i]->nOrg = 0x8000;
 			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;
@@ -355,6 +359,7 @@ 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) {

src/link/mapfile.c

@@ -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

src/link/object.c

@@ -446,8 +446,8 @@ obj_ReadOpenFile(FILE * pObjfile, char *tzObjectfile)
 			//V2 is really the same but the are new patch types
 			obj_ReadRGB(pObjfile, 0);
 			break;
-		case '3':
+		case '3': // V3 is very similiar, but contains section names and byte alignment
-			// V3 is very similiar, but contains section names and byte alignment
+		case '4': // V4 supports OAM sections, but is otherwise identical
 			obj_ReadRGB(pObjfile, CONTAINS_SECTION_NAME | CONTAINS_SECTION_ALIGNMENT);
 			break;
 		default:

src/link/patch.c

@@ -68,7 +68,7 @@ getsymbank(SLONG symid)
 		errx(1, "*INTERNAL* UNKNOWN SYMBOL TYPE");
 	}
 
-	if (nBank == BANK_WRAM0) return 0;
+	if (nBank == BANK_WRAM0 || nBank == BANK_OAM) return 0;
 	if (nBank >= BANK_WRAMX && nBank < (BANK_WRAMX + BANK_COUNT_WRAMX))
 		return nBank - BANK_WRAMX + 1;
 	if (nBank >= BANK_VRAM && nBank < (BANK_VRAM + BANK_COUNT_VRAM))