| 1058 |
|
static bool patch_68k_emul(void) |
| 1059 |
|
{ |
| 1060 |
|
uint32 *lp; |
| 1061 |
< |
uint32 base; |
| 1061 |
> |
uint32 base, loc; |
| 1062 |
|
|
| 1063 |
|
// Overwrite twi instructions |
| 1064 |
|
static const uint8 twi_dat[] = {0x0f, 0xff, 0x00, 0x00, 0x0f, 0xff, 0x00, 0x01, 0x0f, 0xff, 0x00, 0x02}; |
| 1266 |
|
return false; |
| 1267 |
|
dr_found: |
| 1268 |
|
lp++; |
| 1269 |
< |
*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff)); // b DR_CACHE_BASE+0x1f000 |
| 1270 |
< |
lp = (uint32 *)(ROM_BASE + 0x37f000); |
| 1271 |
< |
*lp++ = htonl(0x3c000000 + ((ROM_BASE + 0x46d0a4) >> 16)); // lis r0,xxx |
| 1272 |
< |
*lp++ = htonl(0x60000000 + ((ROM_BASE + 0x46d0a4) & 0xffff)); // ori r0,r0,xxx |
| 1273 |
< |
*lp++ = htonl(0x7c0903a6); // mtctr r0 |
| 1274 |
< |
*lp = htonl(POWERPC_BCTR); // bctr |
| 1269 |
> |
loc = (uint32)lp - ROM_BASE; |
| 1270 |
> |
if ((base = powerpc_branch_target(ROM_BASE + loc)) == 0) base = ROM_BASE + loc; |
| 1271 |
> |
static const uint8 dr_ret_dat[] = {0x80, 0xbf, 0x08, 0x14, 0x53, 0x19, 0x4d, 0xac, 0x7c, 0xa8, 0x03, 0xa6}; |
| 1272 |
> |
if ((base = find_rom_data(base - ROM_BASE, 0x380000, dr_ret_dat, sizeof(dr_ret_dat))) == 0) return false; |
| 1273 |
> |
D(bug("dr_ret %08lx\n", base)); |
| 1274 |
> |
if (base != loc) { |
| 1275 |
> |
// OldWorld ROMs contain an absolute branch |
| 1276 |
> |
D(bug(" patching absolute branch at %08x\n", (uint32)lp - ROM_BASE)); |
| 1277 |
> |
*lp = htonl(0x48000000 + 0xf000 - (((uint32)lp - ROM_BASE) & 0xffff)); // b DR_CACHE_BASE+0x1f000 |
| 1278 |
> |
lp = (uint32 *)(ROM_BASE + 0x37f000); |
| 1279 |
> |
*lp++ = htonl(0x3c000000 + ((ROM_BASE + base) >> 16)); // lis r0,xxx |
| 1280 |
> |
*lp++ = htonl(0x60000000 + ((ROM_BASE + base) & 0xffff)); // ori r0,r0,xxx |
| 1281 |
> |
*lp++ = htonl(0x7c0803a6); // mtlr r0 |
| 1282 |
> |
*lp = htonl(POWERPC_BLR); // blr |
| 1283 |
> |
} |
| 1284 |
|
return true; |
| 1285 |
|
} |
| 1286 |
|
|
