#include <3ds.h>
#include "memory.h"
#include "patcher.h"
#include "ifile.h"
#ifndef PATH_MAX
#define PATH_MAX 255
#define CONFIG(a) ((loadConfig() >> (a + 16)) & 1)
#define MULTICONFIG(a) ((loadConfig() >> (a * 2 + 6)) & 3)
#define BOOTCONFIG(a, b) ((loadConfig() >> a) & b)
#endif
static int memcmp(const void *buf1, const void *buf2, u32 size)
{
const u8 *buf1c = (const u8 *)buf1;
const u8 *buf2c = (const u8 *)buf2;
for(u32 i = 0; i < size; i++)
{
int cmp = buf1c[i] - buf2c[i];
if(cmp) return cmp;
}
return 0;
}
//Quick Search algorithm, adapted from http://igm.univ-mlv.fr/~lecroq/string/node19.html#SECTION00190
static u8 *memsearch(u8 *startPos, const void *pattern, u32 size, u32 patternSize)
{
const u8 *patternc = (const u8 *)pattern;
//Preprocessing
u32 table[256];
for(u32 i = 0; i < 256; ++i)
table[i] = patternSize + 1;
for(u32 i = 0; i < patternSize; ++i)
table[patternc[i]] = patternSize - i;
//Searching
u32 j = 0;
while(j <= size - patternSize)
{
if(memcmp(patternc, startPos + j, patternSize) == 0)
return startPos + j;
j += table[startPos[j + patternSize]];
}
return NULL;
}
static u32 patchMemory(u8 *start, u32 size, const void *pattern, u32 patSize, int offset, const void *replace, u32 repSize, u32 count)
{
u32 i;
for(i = 0; i < count; i++)
{
u8 *found = memsearch(start, pattern, size, patSize);
if(found == NULL) break;
memcpy(found + offset, replace, repSize);
u32 at = (u32)(found - start);
if(at + patSize > size) break;
size -= at + patSize;
start = found + patSize;
}
return i;
}
static inline size_t strnlen(const char *string, size_t maxlen)
{
size_t size;
for(size = 0; *string && size < maxlen; string++, size++);
return size;
}
static int fileOpen(IFile *file, FS_ArchiveID id, const char *path, int flags)
{
FS_Archive archive;
FS_Path ppath;
size_t len = strnlen(path, PATH_MAX);
archive.id = id;
archive.lowPath.type = PATH_EMPTY;
archive.lowPath.size = 1;
archive.lowPath.data = (u8 *)"";
ppath.type = PATH_ASCII;
ppath.data = path;
ppath.size = len + 1;
return IFile_Open(file, archive, ppath, flags);
}
static u32 secureInfoExists(void)
{
static u32 secureInfoExists = 0;
if(!secureInfoExists)
{
IFile file;
if(R_SUCCEEDED(fileOpen(&file, ARCHIVE_NAND_RW, "/sys/SecureInfo_C", FS_OPEN_READ)))
{
secureInfoExists = 1;
IFile_Close(&file);
}
}
return secureInfoExists;
}
static u32 loadConfig(void)
{
static u32 config = 0;
if(!config)
{
IFile file;
if(R_SUCCEEDED(fileOpen(&file, ARCHIVE_SDMC, "/luma/config.bin", FS_OPEN_READ)))
{
u64 total;
if(R_SUCCEEDED(IFile_Read(&file, &total, &config, 4))) config |= 1 << 4;
IFile_Close(&file);
}
}
return config;
}
static int loadTitleLocaleConfig(u64 progId, u8 *regionId, u8 *languageId)
{
/* Here we look for "/luma/locales/[u64 titleID in hex, uppercase].txt"
If it exists it should contain, for example, "EUR IT" */
char path[] = "/luma/locales/0000000000000000.txt";
u32 i = 29;
while(progId > 0)
{
static const char hexDigits[] = "0123456789ABCDEF";
path[i--] = hexDigits[(u32)(progId & 0xF)];
progId >>= 4;
}
IFile file;
Result ret = fileOpen(&file, ARCHIVE_SDMC, path, FS_OPEN_READ);
if(R_SUCCEEDED(ret))
{
char buf[6];
u64 total;
ret = IFile_Read(&file, &total, buf, 6);
IFile_Close(&file);
if(!R_SUCCEEDED(ret) || total < 6) return -1;
for(u32 i = 0; i < 7; ++i)
{
static const char *regions[] = {"JPN", "USA", "EUR", "AUS", "CHN", "KOR", "TWN"};
if(memcmp(buf, regions[i], 3) == 0)
{
*regionId = (u8)i;
break;
}
}
for(u32 i = 0; i < 12; ++i)
{
static const char *languages[] = {"JP", "EN", "FR", "DE", "IT", "ES", "ZH", "KO", "NL", "PT", "RU", "TW"};
if(memcmp(buf + 4, languages[i], 2) == 0)
{
*languageId = (u8)i;
break;
}
}
}
return ret;
}
static u8 *getCfgOffsets(u8 *code, u32 size, u32 *CFGUHandleOffset)
{
/* HANS:
Look for error code which is known to be stored near cfg:u handle
this way we can find the right candidate
(handle should also be stored right after end of candidate function) */
u32 n = 0,
possible[24];
for(u8 *pos = code + 4; n < 24 && pos < code + size - 4; pos += 4)
{
if(*(u32 *)pos == 0xD8A103F9)
{
for(u32 *l = (u32 *)pos - 4; n < 24 && l < (u32 *)pos + 4; l++)
if(*l <= 0x10000000) possible[n++] = *l;
}
}
for(u8 *CFGU_GetConfigInfoBlk2_endPos = code; CFGU_GetConfigInfoBlk2_endPos < code + size - 8; CFGU_GetConfigInfoBlk2_endPos += 4)
{
static const u32 CFGU_GetConfigInfoBlk2_endPattern[] = {0xE8BD8010, 0x00010082};
//There might be multiple implementations of GetConfigInfoBlk2 but let's search for the one we want
u32 *cmp = (u32 *)CFGU_GetConfigInfoBlk2_endPos;
if(cmp[0] == CFGU_GetConfigInfoBlk2_endPattern[0] && cmp[1] == CFGU_GetConfigInfoBlk2_endPattern[1])
{
*CFGUHandleOffset = *((u32 *)CFGU_GetConfigInfoBlk2_endPos + 2);
for(u32 i = 0; i < n; i++)
if(possible[i] == *CFGUHandleOffset) return CFGU_GetConfigInfoBlk2_endPos;
CFGU_GetConfigInfoBlk2_endPos += 4;
}
}
return NULL;
}
static void patchCfgGetLanguage(u8 *code, u32 size, u8 languageId, u8 *CFGU_GetConfigInfoBlk2_endPos)
{
u8 *CFGU_GetConfigInfoBlk2_startPos; //Let's find STMFD SP (there might be a NOP before, but nevermind)
for(CFGU_GetConfigInfoBlk2_startPos = CFGU_GetConfigInfoBlk2_endPos - 4;
CFGU_GetConfigInfoBlk2_startPos >= code && *((u16 *)CFGU_GetConfigInfoBlk2_startPos + 1) != 0xE92D;
CFGU_GetConfigInfoBlk2_startPos -= 2);
for(u8 *languageBlkIdPos = code; languageBlkIdPos < code + size; languageBlkIdPos += 4)
{
if(*(u32 *)languageBlkIdPos == 0xA0002)
{
for(u8 *instr = languageBlkIdPos - 8; instr >= languageBlkIdPos - 0x1008 && instr >= code + 4; instr -= 4) //Should be enough
{
if(instr[3] == 0xEB) //We're looking for BL
{
u8 *calledFunction = instr;
u32 i = 0,
found;
do
{
u32 low24 = (*(u32 *)calledFunction & 0x00FFFFFF) << 2;
u32 signMask = (u32)(-(low24 >> 25)) & 0xFC000000; //Sign extension
s32 offset = (s32)(low24 | signMask) + 8; //Branch offset + 8 for prefetch
calledFunction += offset;
found = calledFunction >= CFGU_GetConfigInfoBlk2_startPos - 4 && calledFunction <= CFGU_GetConfigInfoBlk2_endPos;
i++;
}
while(i < 2 && !found && calledFunction[3] == 0xEA);
if(found)
{
*((u32 *)instr - 1) = 0xE3A00000 | languageId; // mov r0, sp => mov r0, =languageId
*(u32 *)instr = 0xE5CD0000; // bl CFGU_GetConfigInfoBlk2 => strb r0, [sp]
*((u32 *)instr + 1) = 0xE3B00000; // (1 or 2 instructions) => movs r0, 0 (result code)
//We're done
return;
}
}
}
}
}
}
static void patchCfgGetRegion(u8 *code, u32 size, u8 regionId, u32 CFGUHandleOffset)
{
for(u8 *cmdPos = code; cmdPos < code + size - 28; cmdPos += 4)
{
static const u32 cfgSecureInfoGetRegionCmdPattern[] = {0xEE1D4F70, 0xE3A00802, 0xE5A40080};
u32 *cmp = (u32 *)cmdPos;
if(cmp[0] == cfgSecureInfoGetRegionCmdPattern[0] && cmp[1] == cfgSecureInfoGetRegionCmdPattern[1] &&
cmp[2] == cfgSecureInfoGetRegionCmdPattern[2] && *((u16 *)cmdPos + 7) == 0xE59F &&
*(u32 *)(cmdPos + 20 + *((u16 *)cmdPos + 6)) == CFGUHandleOffset)
{
*((u32 *)cmdPos + 4) = 0xE3A00000 | regionId; // mov r0, =regionId
*((u32 *)cmdPos + 5) = 0xE5C40008; // strb r0, [r4, 8]
*((u32 *)cmdPos + 6) = 0xE3B00000; // movs r0, 0 (result code) ('s' not needed but nvm)
*((u32 *)cmdPos + 7) = 0xE5840004; // str r0, [r4, 4]
//The remaining, not patched, function code will do the rest for us
break;
}
}
}
void patchCode(u64 progId, u8 *code, u32 size)
{
switch(progId)
{
case 0x0004003000008F02LL: // USA Menu
case 0x0004003000008202LL: // EUR Menu
case 0x0004003000009802LL: // JPN Menu
case 0x000400300000A102LL: // CHN Menu
case 0x000400300000A902LL: // KOR Menu
case 0x000400300000B102LL: // TWN Menu
{
static const u8 regionFreePattern[] = {
0x00, 0x00, 0x55, 0xE3, 0x01, 0x10, 0xA0, 0xE3
};
static const u8 regionFreePatch[] = {
0x01, 0x00, 0xA0, 0xE3, 0x1E, 0xFF, 0x2F, 0xE1
};
//Patch SMDH region checks
patchMemory(code, size,
regionFreePattern,
sizeof(regionFreePattern), -16,
regionFreePatch,
sizeof(regionFreePatch), 1
);
break;
}
case 0x0004013000002C02LL: // NIM
{
static const u8 blockAutoUpdatesPattern[] = {
0x25, 0x79, 0x0B, 0x99
};
static const u8 blockAutoUpdatesPatch[] = {
0xE3, 0xA0
};
static const u8 skipEshopUpdateCheckPattern[] = {
0x30, 0xB5, 0xF1, 0xB0
};
static const u8 skipEshopUpdateCheckPatch[] = {
0x00, 0x20, 0x08, 0x60, 0x70, 0x47
};
//Block silent auto-updates
patchMemory(code, size,
blockAutoUpdatesPattern,
sizeof(blockAutoUpdatesPattern), 0,
blockAutoUpdatesPatch,
sizeof(blockAutoUpdatesPatch), 1
);
//Skip update checks to access the EShop
patchMemory(code, size,
skipEshopUpdateCheckPattern,
sizeof(skipEshopUpdateCheckPattern), 0,
skipEshopUpdateCheckPatch,
sizeof(skipEshopUpdateCheckPatch), 1
);
break;
}
case 0x0004013000003202LL: // FRIENDS
{
static const u8 fpdVerPattern[] = {
0xE0, 0x1E, 0xFF, 0x2F, 0xE1, 0x01, 0x01, 0x01
};
static const u8 fpdVerPatch = 0x05;
//Allow online access to work with old friends modules
patchMemory(code, size,
fpdVerPattern,
sizeof(fpdVerPattern), 9,
&fpdVerPatch,
sizeof(fpdVerPatch), 1
);
break;
}
case 0x0004001000021000LL: // USA MSET
case 0x0004001000020000LL: // JPN MSET
case 0x0004001000022000LL: // EUR MSET
case 0x0004001000026000LL: // CHN MSET
case 0x0004001000027000LL: // KOR MSET
case 0x0004001000028000LL: // TWN MSET
{
if(CONFIG(6))
{
static const u16 verPattern[] = u"Ver.";
const u32 currentNand = BOOTCONFIG(0, 3);
const u32 matchingFirm = BOOTCONFIG(2, 1) == (currentNand != 0);
//Patch Ver. string
patchMemory(code, size,
verPattern,
sizeof(verPattern) - sizeof(u16), 0,
!currentNand ? ((matchingFirm) ? u" Sys" : u"SysE") :
((currentNand == 1) ? (matchingFirm ? u" Emu" : u"EmuS") : ((matchingFirm) ? u"Emu2" : u"Em2S")),
sizeof(verPattern) - sizeof(u16), 1
);
}
break;
}
case 0x0004013000008002LL: // NS
{
static const u8 stopCartUpdatesPattern[] = {
0x0C, 0x18, 0xE1, 0xD8
};
static const u8 stopCartUpdatesPatch[] = {
0x0B, 0x18, 0x21, 0xC8
};
//Disable updates from foreign carts (makes carts region-free)
patchMemory(code, size,
stopCartUpdatesPattern,
sizeof(stopCartUpdatesPattern), 0,
stopCartUpdatesPatch,
sizeof(stopCartUpdatesPatch), 2
);
u32 cpuSetting = MULTICONFIG(1);
if(cpuSetting)
{
static const u8 cfgN3dsCpuPattern[] = {
0x00, 0x40, 0xA0, 0xE1, 0x07, 0x00
};
u32 *cfgN3dsCpuLoc = (u32 *)memsearch(code, cfgN3dsCpuPattern, size, sizeof(cfgN3dsCpuPattern));
//Patch N3DS CPU Clock and L2 cache setting
if(cfgN3dsCpuLoc != NULL)
{
*(cfgN3dsCpuLoc + 1) = 0xE1A00000;
*(cfgN3dsCpuLoc + 8) = 0xE3A00000 | cpuSetting;
}
}
break;
}
case 0x0004013000001702LL: // CFG
{
static const u8 secureinfoSigCheckPattern[] = {
0x06, 0x46, 0x10, 0x48, 0xFC
};
static const u8 secureinfoSigCheckPatch[] = {
0x00, 0x26
};
//Disable SecureInfo signature check
patchMemory(code, size,
secureinfoSigCheckPattern,
sizeof(secureinfoSigCheckPattern), 0,
secureinfoSigCheckPatch,
sizeof(secureinfoSigCheckPatch), 1
);
if(secureInfoExists())
{
static const u16 secureinfoFilenamePattern[] = u"SecureInfo_";
static const u16 secureinfoFilenamePatch[] = u"C";
//Use SecureInfo_C
patchMemory(code, size,
secureinfoFilenamePattern,
sizeof(secureinfoFilenamePattern) - sizeof(u16),
sizeof(secureinfoFilenamePattern) - sizeof(u16),
secureinfoFilenamePatch,
sizeof(secureinfoFilenamePatch) - sizeof(u16), 2
);
}
break;
}
default:
if(CONFIG(4))
{
u32 tidHigh = (progId & 0xFFFFFFF000000000LL) >> 0x24;
if(tidHigh == 0x0004000)
{
//Language emulation
u8 regionId = 0xFF,
languageId = 0xFF;
if(R_SUCCEEDED(loadTitleLocaleConfig(progId, ®ionId, &languageId)))
{
u32 CFGUHandleOffset;
u8 *CFGU_GetConfigInfoBlk2_endPos = getCfgOffsets(code, size, &CFGUHandleOffset);
if(CFGU_GetConfigInfoBlk2_endPos != NULL)
{
if(languageId != 0xFF) patchCfgGetLanguage(code, size, languageId, CFGU_GetConfigInfoBlk2_endPos);
if(regionId != 0xFF) patchCfgGetRegion(code, size, regionId, CFGUHandleOffset);
}
}
}
break;
}
}
}