Macintosh-Tools/macemu
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Fix SCC initialization code detection. Move up AddrMap patch space since

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we clobber 40 bytes below it and it may intersect with GetScrap patch space.
This commit is contained in:
gbeauche 2003-12-15 15:23:59 +00:00
parent ae8c08b260
commit 24c4ae354c
1 changed files with 23 additions and 6 deletions
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29
SheepShaver/src/rom_patches.cpp
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@ -62,7 +62,7 @@
const uint32 CHECK_LOAD_PATCH_SPACE = 0x2fcf00;
const uint32 PUT_SCRAP_PATCH_SPACE = 0x2fcf80;
const uint32 GET_SCRAP_PATCH_SPACE = 0x2fcfc0;
const uint32 ADDR_MAP_PATCH_SPACE = 0x2fd000;
const uint32 ADDR_MAP_PATCH_SPACE = 0x2fd100;
// Global variables
int ROMType; // ROM type
@ -310,6 +310,23 @@ static uint32 find_rom_powerpc_branch(uint32 start, uint32 end, uint32 target)
}
/*
* Check that requested ROM patch space is really available
*/
static bool check_rom_patch_space(uint32 base, uint32 size)
{
size = (size + 3) & -4;
for (int i = 0; i < size; i += 4) {
uint32 x = ntohl(*(uint32 *)(ROM_BASE + base + i));
printf("%08x\n", x);
if (x != 0x6b636b63 && x != 0)
return false;
}
return true;
}
/*
* List of audio sifters installed in ROM and System file
*/
@ -697,13 +714,13 @@ bool PatchROM(void)
return false;
// Check that other ROM addresses point to really free regions
if (ntohl(*(uint32 *)(ROM_BASE + CHECK_LOAD_PATCH_SPACE)) != 0x6b636b63)
if (!check_rom_patch_space(CHECK_LOAD_PATCH_SPACE, 0x40))
return false;
if (ntohl(*(uint32 *)(ROM_BASE + PUT_SCRAP_PATCH_SPACE)) != 0x6b636b63)
if (!check_rom_patch_space(PUT_SCRAP_PATCH_SPACE, 0x40))
return false;
if (ntohl(*(uint32 *)(ROM_BASE + GET_SCRAP_PATCH_SPACE)) != 0x6b636b63)
if (!check_rom_patch_space(GET_SCRAP_PATCH_SPACE, 0x40))
return false;
if (ntohl(*(uint32 *)(ROM_BASE + ADDR_MAP_PATCH_SPACE)) != 0x6b636b63)
if (!check_rom_patch_space(ADDR_MAP_PATCH_SPACE - 10 * 4, 0x100))
return false;
// Apply patches
@ -1646,7 +1663,7 @@ static bool patch_68k(void)
D(bug("scc_init_caller %08lx\n", base + 12));
wp = (uint16 *)(ROM_BASE + base + 12);
loc = ntohs(wp[1]) + ((uintptr)wp - ROM_BASE) + 2;
static const uint8 scc_init_dat[] = {0x08, 0x38, 0x00, 0x03, 0x0d, 0xd3, 0x67, 0x12, 0x20, 0x78, 0x01, 0xdc, 0x22, 0x78, 0x01, 0xd8};
static const uint8 scc_init_dat[] = {0x20, 0x78, 0x01, 0xdc, 0x22, 0x78, 0x01, 0xd8};
if ((base = find_rom_data(loc, loc + 0x80, scc_init_dat, sizeof(scc_init_dat))) != loc) return false;
D(bug("scc_init %08lx\n", base));
wp = (uint16 *)(ROM_BASE + base);