Macintosh-Tools/macemu
1
0
Fork 0
mirror of https://github.com/kanjitalk755/macemu.git synced 2024-11-27 02:49:42 +00:00
Code Issues Projects Releases Wiki Activity

avoid unaligned memory accessed when patching the ROM (IRIX/mips)

Browse Source
This commit is contained in:
gbeauche 2005-12-12 20:46:31 +00:00
parent 5c287d301d
commit c71bc8cc4c
1 changed files with 20 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
SheepShaver/src/rom_patches.cpp
View File

@ -224,10 +224,9 @@ static uint32 rsrc_ptr = 0;
// id = 4711 means "find any ID"
static uint32 find_rom_resource(uint32 s_type, int16 s_id = 4711, bool cont = false)
{
uint32 *lp = (uint32 *)(ROMBaseHost + 0x1a);
uint32 x = ntohl(*lp);
uint8 *bp = (uint8 *)(ROMBaseHost + x + 5);
uint32 header_size = *bp;
uint32 lp = ROM_BASE + 0x1a;
uint32 x = ReadMacInt32(lp);
uint32 header_size = ReadMacInt8(ROM_BASE + x + 5);
if (!cont)
rsrc_ptr = x;
@ -235,17 +234,17 @@ static uint32 find_rom_resource(uint32 s_type, int16 s_id = 4711, bool cont = fa
return 0;
for (;;) {
lp = (uint32 *)(ROMBaseHost + rsrc_ptr);
rsrc_ptr = ntohl(*lp);
lp = ROM_BASE + rsrc_ptr;
rsrc_ptr = ReadMacInt32(lp);
if (rsrc_ptr == 0)
break;
rsrc_ptr += header_size;
lp = (uint32 *)(ROMBaseHost + rsrc_ptr + 4);
uint32 data = ntohl(*lp); lp++;
uint32 type = ntohl(*lp); lp++;
int16 id = ntohs(*(int16 *)lp);
lp = ROM_BASE + rsrc_ptr + 4;
uint32 data = ReadMacInt32(lp);
uint32 type = ReadMacInt32(lp + 4);
int16 id = ReadMacInt16(lp + 8);
if (type == s_type && (id == s_id || s_id == 4711))
return data;
}
@ -259,13 +258,12 @@ static uint32 find_rom_resource(uint32 s_type, int16 s_id = 4711, bool cont = fa
static uint32 find_rom_trap(uint16 trap)
{
uint32 *lp = (uint32 *)(ROMBaseHost + 0x22);
lp = (uint32 *)(ROMBaseHost + ntohl(*lp));
uint32 lp = ROM_BASE + ReadMacInt32(ROM_BASE + 0x22);
if (trap > 0xa800)
return ntohl(lp[trap & 0x3ff]);
return ReadMacInt32(lp + 4 * (trap & 0x3ff));
else
return ntohl(lp[(trap & 0xff) + 0x400]);
return ReadMacInt32(lp + 4 * ((trap & 0xff) + 0x400));
}
@ -1715,11 +1713,11 @@ static bool patch_68k(void)
static const uint8 ext_cache_dat[] = {0x4e, 0x7b, 0x00, 0x02};
if ((base = find_rom_data(0x1d0, 0x230, ext_cache_dat, sizeof(ext_cache_dat))) == 0) return false;
D(bug("ext_cache %08lx\n", base));
lp = (uint32 *)(ROMBaseHost + base + 6);
wp = (uint16 *)(ROMBaseHost + ntohl(*lp) + base + 6);
loc = ReadMacInt32(ROM_BASE + base + 6);
wp = (uint16 *)(ROMBaseHost + loc + base + 6);
*wp = htons(M68K_RTS);
lp = (uint32 *)(ROMBaseHost + base + 12);
wp = (uint16 *)(ROMBaseHost + ntohl(*lp) + base + 12);
loc = ReadMacInt32(ROM_BASE + base + 12);
wp = (uint16 *)(ROMBaseHost + loc + base + 12);
*wp = htons(M68K_RTS);
// Fake CPU speed test (SetupTimeK)
@ -2264,9 +2262,8 @@ static bool patch_68k(void)
*wp++ = htons(M68K_JMP);
*wp++ = htons((ROM_BASE + put_scrap) >> 16);
*wp++ = htons((ROM_BASE + put_scrap) & 0xffff);
lp = (uint32 *)(ROMBaseHost + 0x22);
lp = (uint32 *)(ROMBaseHost + ntohl(*lp));
lp[0xa9fe & 0x3ff] = htonl(PUT_SCRAP_PATCH_SPACE);
base = ROM_BASE + ReadMacInt32(ROM_BASE + 0x22);
WriteMacInt32(base + 4 * (0xa9fe & 0x3ff), PUT_SCRAP_PATCH_SPACE);
// Patch GetScrap() for clipboard exchange with host OS
uint32 get_scrap = find_rom_trap(0xa9fd); // GetScrap()
@ -2275,9 +2272,8 @@ static bool patch_68k(void)
*wp++ = htons(M68K_JMP);
*wp++ = htons((ROM_BASE + get_scrap) >> 16);
*wp++ = htons((ROM_BASE + get_scrap) & 0xffff);
lp = (uint32 *)(ROMBaseHost + 0x22);
lp = (uint32 *)(ROMBaseHost + ntohl(*lp));
lp[0xa9fd & 0x3ff] = htonl(GET_SCRAP_PATCH_SPACE);
base = ROM_BASE + ReadMacInt32(ROM_BASE + 0x22);
WriteMacInt32(base + 4 * (0xa9fd & 0x3ff), GET_SCRAP_PATCH_SPACE);
// Patch SynchIdleTime()
if (PrefsFindBool("idlewait")) {