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GBA Memory: Patching functions can now expand ROM

This commit is contained in:
Jeffrey Pfau 2015-04-18 13:56:56 -07:00
parent 0789ebb8cc
commit f94c959cac
1 changed files with 18 additions and 8 deletions
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26
src/gba/memory.c
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@ -17,6 +17,7 @@
#define IDLE_LOOP_THRESHOLD 10000 #define IDLE_LOOP_THRESHOLD 10000
static uint32_t _popcount32(unsigned bits); static uint32_t _popcount32(unsigned bits);
static void _pristineCow(struct GBA* gba);
static uint32_t _deadbeef[2] = { 0xDEADBEEF, 0xFEEDFACE }; static uint32_t _deadbeef[2] = { 0xDEADBEEF, 0xFEEDFACE };
static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t region); static void GBASetActiveRegion(struct ARMCore* cpu, uint32_t region);
@ -848,12 +849,12 @@ void GBAPatch32(struct ARMCore* cpu, uint32_t address, int32_t value, int32_t* o
case REGION_CART1_EX: case REGION_CART1_EX:
case REGION_CART2: case REGION_CART2:
case REGION_CART2_EX: case REGION_CART2_EX:
_pristineCow(gba);
if ((address & (SIZE_CART0 - 1)) < gba->memory.romSize) { if ((address & (SIZE_CART0 - 1)) < gba->memory.romSize) {
LOAD_32(oldValue, address & (SIZE_CART0 - 1), gba->memory.rom); gba->memory.romSize = (address & (SIZE_CART0 - 4)) + 4;
STORE_32(value, address & (SIZE_CART0 - 1), gba->memory.rom);
} else {
GBALog(gba, GBA_LOG_WARN, "Bad memory Patch32: 0x%08X", address);
} }
LOAD_32(oldValue, address & (SIZE_CART0 - 1), gba->memory.rom);
STORE_32(value, address & (SIZE_CART0 - 1), gba->memory.rom);
break; break;
case REGION_CART_SRAM: case REGION_CART_SRAM:
case REGION_CART_SRAM_MIRROR: case REGION_CART_SRAM_MIRROR:
@ -915,12 +916,12 @@ void GBAPatch16(struct ARMCore* cpu, uint32_t address, int16_t value, int16_t* o
case REGION_CART1_EX: case REGION_CART1_EX:
case REGION_CART2: case REGION_CART2:
case REGION_CART2_EX: case REGION_CART2_EX:
_pristineCow(gba);
if ((address & (SIZE_CART0 - 1)) < gba->memory.romSize) { if ((address & (SIZE_CART0 - 1)) < gba->memory.romSize) {
LOAD_16(oldValue, address & (SIZE_CART0 - 1), gba->memory.rom); gba->memory.romSize = (address & (SIZE_CART0 - 2)) + 2;
STORE_16(value, address & (SIZE_CART0 - 1), gba->memory.rom);
} else {
GBALog(gba, GBA_LOG_WARN, "Bad memory Patch16: 0x%08X", address);
} }
LOAD_16(oldValue, address & (SIZE_CART0 - 1), gba->memory.rom);
STORE_16(value, address & (SIZE_CART0 - 1), gba->memory.rom);
break; break;
case REGION_CART_SRAM: case REGION_CART_SRAM:
case REGION_CART_SRAM_MIRROR: case REGION_CART_SRAM_MIRROR:
@ -1482,3 +1483,12 @@ uint32_t _popcount32(unsigned bits) {
bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333); bits = (bits & 0x33333333) + ((bits >> 2) & 0x33333333);
return (((bits + (bits >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24; return (((bits + (bits >> 4)) & 0xF0F0F0F) * 0x1010101) >> 24;
} }
void _pristineCow(struct GBA* gba) {
if (gba->memory.rom != gba->pristineRom) {
return;
}
gba->memory.rom = anonymousMemoryMap(SIZE_CART0);
memcpy(gba->memory.rom, gba->pristineRom, gba->memory.romSize);
memset(((uint8_t*) gba->memory.rom) + gba->memory.romSize, 0xFF, SIZE_CART0 - gba->memory.romSize);
}