630 lines
20 KiB
C
630 lines
20 KiB
C
#include <3ds.h>
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#include "memory.h"
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#include "patcher.h"
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#include "ifile.h"
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typedef struct __attribute__((packed))
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{
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char magic[4];
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u8 versionMajor;
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u8 versionMinor;
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u8 versionBuild;
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u8 flags; /* bit 0: dev branch; bit 1: is release */
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u32 commitHash;
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u32 config;
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} CFWInfo;
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CFWInfo info = {0};
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#ifndef PATH_MAX
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#define PATH_MAX 255
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#define CONFIG(a) (((info.config >> (a + 16)) & 1) != 0)
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#define MULTICONFIG(a) ((info.config >> (a * 2 + 6)) & 3)
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#define BOOTCONFIG(a, b) ((info.config >> a) & b)
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#endif
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static int memcmp(const void *buf1, const void *buf2, u32 size)
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{
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const u8 *buf1c = (const u8 *)buf1;
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const u8 *buf2c = (const u8 *)buf2;
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for(u32 i = 0; i < size; i++)
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{
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int cmp = buf1c[i] - buf2c[i];
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if(cmp) return cmp;
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}
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return 0;
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}
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//Quick Search algorithm, adapted from http://igm.univ-mlv.fr/~lecroq/string/node19.html#SECTION00190
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static u8 *memsearch(u8 *startPos, const void *pattern, u32 size, u32 patternSize)
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{
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const u8 *patternc = (const u8 *)pattern;
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//Preprocessing
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u32 table[256];
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for(u32 i = 0; i < 256; ++i)
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table[i] = patternSize + 1;
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for(u32 i = 0; i < patternSize; ++i)
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table[patternc[i]] = patternSize - i;
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//Searching
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u32 j = 0;
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while(j <= size - patternSize)
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{
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if(memcmp(patternc, startPos + j, patternSize) == 0)
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return startPos + j;
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j += table[startPos[j + patternSize]];
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}
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return NULL;
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}
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static u32 patchMemory(u8 *start, u32 size, const void *pattern, u32 patSize, int offset, const void *replace, u32 repSize, u32 count)
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{
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u32 i;
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for(i = 0; i < count; i++)
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{
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u8 *found = memsearch(start, pattern, size, patSize);
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if(found == NULL) break;
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memcpy(found + offset, replace, repSize);
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u32 at = (u32)(found - start);
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if(at + patSize > size) break;
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size -= at + patSize;
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start = found + patSize;
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}
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return i;
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}
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static inline size_t strnlen(const char *string, size_t maxlen)
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{
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size_t size;
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for(size = 0; *string && size < maxlen; string++, size++);
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return size;
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}
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static int fileOpen(IFile *file, FS_ArchiveID archiveId, const char *path, int flags)
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{
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FS_Path filePath = {PATH_ASCII, strnlen(path, PATH_MAX) + 1, path},
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archivePath = {PATH_EMPTY, 1, (u8 *)""};
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return IFile_Open(file, archiveId, archivePath, filePath, flags);
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}
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int __attribute__((naked)) svcGetCFWInfo(CFWInfo __attribute__((unused)) *out)
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{
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__asm__ volatile("svc 0x2E; bx lr");
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}
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static void loadCFWInfo(void)
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{
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static bool infoLoaded = false;
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if(!infoLoaded)
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{
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svcGetCFWInfo(&info);
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IFile file;
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if(R_SUCCEEDED(fileOpen(&file, ARCHIVE_SDMC, "/", FS_OPEN_READ))) //init SD card for firmlaunch patches
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{
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IFile_Close(&file);
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}
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}
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infoLoaded = true;
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}
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static bool secureInfoExists(void)
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{
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static bool exists = false;
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if(!exists)
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{
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IFile file;
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if(R_SUCCEEDED(fileOpen(&file, ARCHIVE_NAND_RW, "/sys/SecureInfo_C", FS_OPEN_READ)))
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{
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exists = true;
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IFile_Close(&file);
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}
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}
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return exists;
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}
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static void progIdToStr(char *strEnd, u64 progId)
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{
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while(progId)
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{
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static const char hexDigits[] = "0123456789ABCDEF";
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*strEnd-- = hexDigits[(u32)(progId & 0xF)];
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progId >>= 4;
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}
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}
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static void loadTitleCodeSection(u64 progId, u8 *code, u32 size)
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{
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/* Here we look for "/luma/code_sections/[u64 titleID in hex, uppercase].bin"
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If it exists it should be a decompressed binary code file */
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char path[] = "/luma/code_sections/0000000000000000.bin";
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progIdToStr(path + 35, progId);
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IFile file;
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Result ret = fileOpen(&file, ARCHIVE_SDMC, path, FS_OPEN_READ);
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if(R_SUCCEEDED(ret))
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{
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u64 fileSize, total;
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ret = IFile_GetSize(&file, &fileSize);
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if(R_SUCCEEDED(ret) && fileSize <= size)
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{
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ret = IFile_Read(&file, &total, code, fileSize);
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IFile_Close(&file);
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}
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}
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}
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static int loadTitleLocaleConfig(u64 progId, u8 *regionId, u8 *languageId)
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{
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/* Here we look for "/luma/locales/[u64 titleID in hex, uppercase].txt"
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If it exists it should contain, for example, "EUR IT" */
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char path[] = "/luma/locales/0000000000000000.txt";
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progIdToStr(path + 29, progId);
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IFile file;
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Result ret = fileOpen(&file, ARCHIVE_SDMC, path, FS_OPEN_READ);
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if(R_SUCCEEDED(ret))
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{
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char buf[6];
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u64 total;
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ret = IFile_Read(&file, &total, buf, 6);
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IFile_Close(&file);
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if(!R_SUCCEEDED(ret) || total < 6) return -1;
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for(u32 i = 0; i < 7; ++i)
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{
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static const char *regions[] = {"JPN", "USA", "EUR", "AUS", "CHN", "KOR", "TWN"};
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if(memcmp(buf, regions[i], 3) == 0)
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{
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*regionId = (u8)i;
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break;
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}
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}
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for(u32 i = 0; i < 12; ++i)
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{
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static const char *languages[] = {"JP", "EN", "FR", "DE", "IT", "ES", "ZH", "KO", "NL", "PT", "RU", "TW"};
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if(memcmp(buf + 4, languages[i], 2) == 0)
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{
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*languageId = (u8)i;
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break;
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}
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}
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}
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return ret;
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}
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static u8 *getCfgOffsets(u8 *code, u32 size, u32 *CFGUHandleOffset)
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{
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/* HANS:
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Look for error code which is known to be stored near cfg:u handle
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this way we can find the right candidate
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(handle should also be stored right after end of candidate function) */
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u32 n = 0,
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possible[24];
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for(u8 *pos = code + 4; n < 24 && pos < code + size - 4; pos += 4)
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{
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if(*(u32 *)pos == 0xD8A103F9)
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{
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for(u32 *l = (u32 *)pos - 4; n < 24 && l < (u32 *)pos + 4; l++)
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if(*l <= 0x10000000) possible[n++] = *l;
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}
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}
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for(u8 *CFGU_GetConfigInfoBlk2_endPos = code; CFGU_GetConfigInfoBlk2_endPos < code + size - 8; CFGU_GetConfigInfoBlk2_endPos += 4)
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{
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static const u32 CFGU_GetConfigInfoBlk2_endPattern[] = {0xE8BD8010, 0x00010082};
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//There might be multiple implementations of GetConfigInfoBlk2 but let's search for the one we want
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u32 *cmp = (u32 *)CFGU_GetConfigInfoBlk2_endPos;
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if(cmp[0] == CFGU_GetConfigInfoBlk2_endPattern[0] && cmp[1] == CFGU_GetConfigInfoBlk2_endPattern[1])
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{
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*CFGUHandleOffset = *((u32 *)CFGU_GetConfigInfoBlk2_endPos + 2);
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for(u32 i = 0; i < n; i++)
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if(possible[i] == *CFGUHandleOffset) return CFGU_GetConfigInfoBlk2_endPos;
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CFGU_GetConfigInfoBlk2_endPos += 4;
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}
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}
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return NULL;
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}
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static void patchCfgGetLanguage(u8 *code, u32 size, u8 languageId, u8 *CFGU_GetConfigInfoBlk2_endPos)
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{
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u8 *CFGU_GetConfigInfoBlk2_startPos; //Let's find STMFD SP (there might be a NOP before, but nevermind)
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for(CFGU_GetConfigInfoBlk2_startPos = CFGU_GetConfigInfoBlk2_endPos - 4;
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CFGU_GetConfigInfoBlk2_startPos >= code && *((u16 *)CFGU_GetConfigInfoBlk2_startPos + 1) != 0xE92D;
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CFGU_GetConfigInfoBlk2_startPos -= 2);
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for(u8 *languageBlkIdPos = code; languageBlkIdPos < code + size; languageBlkIdPos += 4)
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{
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if(*(u32 *)languageBlkIdPos == 0xA0002)
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{
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for(u8 *instr = languageBlkIdPos - 8; instr >= languageBlkIdPos - 0x1008 && instr >= code + 4; instr -= 4) //Should be enough
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{
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if(instr[3] == 0xEB) //We're looking for BL
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{
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u8 *calledFunction = instr;
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u32 i = 0;
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bool found;
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do
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{
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u32 low24 = (*(u32 *)calledFunction & 0x00FFFFFF) << 2;
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u32 signMask = (u32)(-(low24 >> 25)) & 0xFC000000; //Sign extension
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s32 offset = (s32)(low24 | signMask) + 8; //Branch offset + 8 for prefetch
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calledFunction += offset;
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found = calledFunction >= CFGU_GetConfigInfoBlk2_startPos - 4 && calledFunction <= CFGU_GetConfigInfoBlk2_endPos;
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i++;
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}
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while(i < 2 && !found && calledFunction[3] == 0xEA);
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if(found)
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{
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*((u32 *)instr - 1) = 0xE3A00000 | languageId; // mov r0, sp => mov r0, =languageId
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*(u32 *)instr = 0xE5CD0000; // bl CFGU_GetConfigInfoBlk2 => strb r0, [sp]
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*((u32 *)instr + 1) = 0xE3B00000; // (1 or 2 instructions) => movs r0, 0 (result code)
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//We're done
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return;
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}
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}
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}
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}
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}
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}
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static void patchCfgGetRegion(u8 *code, u32 size, u8 regionId, u32 CFGUHandleOffset)
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{
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for(u8 *cmdPos = code; cmdPos < code + size - 28; cmdPos += 4)
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{
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static const u32 cfgSecureInfoGetRegionCmdPattern[] = {0xEE1D4F70, 0xE3A00802, 0xE5A40080};
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u32 *cmp = (u32 *)cmdPos;
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if(cmp[0] == cfgSecureInfoGetRegionCmdPattern[0] && cmp[1] == cfgSecureInfoGetRegionCmdPattern[1] &&
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cmp[2] == cfgSecureInfoGetRegionCmdPattern[2] && *((u16 *)cmdPos + 7) == 0xE59F &&
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*(u32 *)(cmdPos + 20 + *((u16 *)cmdPos + 6)) == CFGUHandleOffset)
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{
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*((u32 *)cmdPos + 4) = 0xE3A00000 | regionId; // mov r0, =regionId
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*((u32 *)cmdPos + 5) = 0xE5C40008; // strb r0, [r4, 8]
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*((u32 *)cmdPos + 6) = 0xE3B00000; // movs r0, 0 (result code) ('s' not needed but nvm)
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*((u32 *)cmdPos + 7) = 0xE5840004; // str r0, [r4, 4]
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//The remaining, not patched, function code will do the rest for us
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break;
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}
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}
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}
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void patchCode(u64 progId, u8 *code, u32 size)
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{
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loadCFWInfo();
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switch(progId)
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{
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case 0x0004003000008F02LL: // USA Menu
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case 0x0004003000008202LL: // EUR Menu
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case 0x0004003000009802LL: // JPN Menu
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case 0x000400300000A102LL: // CHN Menu
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case 0x000400300000A902LL: // KOR Menu
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case 0x000400300000B102LL: // TWN Menu
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{
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static const u8 regionFreePattern[] = {
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0x00, 0x00, 0x55, 0xE3, 0x01, 0x10, 0xA0, 0xE3
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};
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static const u8 regionFreePatch[] = {
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0x01, 0x00, 0xA0, 0xE3, 0x1E, 0xFF, 0x2F, 0xE1
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};
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//Patch SMDH region checks
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patchMemory(code, size,
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regionFreePattern,
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sizeof(regionFreePattern), -16,
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regionFreePatch,
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sizeof(regionFreePatch), 1
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);
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break;
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}
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case 0x0004013000002C02LL: // NIM
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{
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static const u8 blockAutoUpdatesPattern[] = {
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0x25, 0x79, 0x0B, 0x99
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};
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static const u8 blockAutoUpdatesPatch[] = {
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0xE3, 0xA0
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};
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//Block silent auto-updates
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patchMemory(code, size,
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blockAutoUpdatesPattern,
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sizeof(blockAutoUpdatesPattern), 0,
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blockAutoUpdatesPatch,
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sizeof(blockAutoUpdatesPatch), 1
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);
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//Apply only if the updated NAND hasn't been booted
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if((BOOTCONFIG(0, 3) != 0) == (BOOTCONFIG(2, 1) && CONFIG(1)))
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{
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static const u8 skipEshopUpdateCheckPattern[] = {
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0x30, 0xB5, 0xF1, 0xB0
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};
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static const u8 skipEshopUpdateCheckPatch[] = {
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0x00, 0x20, 0x08, 0x60, 0x70, 0x47
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};
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//Skip update checks to access the EShop
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patchMemory(code, size,
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skipEshopUpdateCheckPattern,
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sizeof(skipEshopUpdateCheckPattern), 0,
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skipEshopUpdateCheckPatch,
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sizeof(skipEshopUpdateCheckPatch), 1
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);
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}
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break;
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}
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case 0x0004013000003202LL: // FRIENDS
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{
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static const u8 fpdVerPattern[] = {
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0xE0, 0x1E, 0xFF, 0x2F, 0xE1, 0x01, 0x01, 0x01
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};
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static const u8 mostRecentFpdVer = 0x06;
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u8 *fpdVer = memsearch(code, fpdVerPattern, size, sizeof(fpdVerPattern));
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//Allow online access to work with old friends modules, without breaking newer firmwares
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if(fpdVer != NULL && fpdVer[9] < mostRecentFpdVer) fpdVer[9] = mostRecentFpdVer;
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break;
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}
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case 0x0004001000021000LL: // USA MSET
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case 0x0004001000020000LL: // JPN MSET
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case 0x0004001000022000LL: // EUR MSET
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case 0x0004001000026000LL: // CHN MSET
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case 0x0004001000027000LL: // KOR MSET
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case 0x0004001000028000LL: // TWN MSET
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{
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if(CONFIG(4))
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{
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static const u16 verPattern[] = u"Ver.";
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const u32 currentNand = BOOTCONFIG(0, 3);
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const u32 matchingFirm = BOOTCONFIG(2, 1) == (currentNand != 0);
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//Patch Ver. string
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patchMemory(code, size,
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verPattern,
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sizeof(verPattern) - sizeof(u16), 0,
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!currentNand ? ((matchingFirm) ? u" Sys" : u"SysE") :
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((currentNand == 1) ? (matchingFirm ? u" Emu" : u"EmuS") : ((matchingFirm) ? u"Emu2" : u"Em2S")),
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sizeof(verPattern) - sizeof(u16), 1
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);
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}
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break;
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}
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case 0x0004013000008002LL: // NS
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{
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static const u8 stopCartUpdatesPattern[] = {
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0x0C, 0x18, 0xE1, 0xD8
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};
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static const u8 stopCartUpdatesPatch[] = {
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0x0B, 0x18, 0x21, 0xC8
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};
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//Disable updates from foreign carts (makes carts region-free)
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patchMemory(code, size,
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stopCartUpdatesPattern,
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sizeof(stopCartUpdatesPattern), 0,
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stopCartUpdatesPatch,
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sizeof(stopCartUpdatesPatch), 2
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);
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u32 cpuSetting = MULTICONFIG(1);
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if(cpuSetting)
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{
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static const u8 cfgN3dsCpuPattern[] = {
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0x00, 0x40, 0xA0, 0xE1, 0x07, 0x00
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};
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u32 *cfgN3dsCpuLoc = (u32 *)memsearch(code, cfgN3dsCpuPattern, size, sizeof(cfgN3dsCpuPattern));
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//Patch N3DS CPU Clock and L2 cache setting
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if(cfgN3dsCpuLoc != NULL)
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{
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*(cfgN3dsCpuLoc + 1) = 0xE1A00000;
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*(cfgN3dsCpuLoc + 8) = 0xE3A00000 | cpuSetting;
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}
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}
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break;
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}
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case 0x0004013000001702LL: // CFG
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{
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static const u8 secureinfoSigCheckPattern[] = {
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0x06, 0x46, 0x10, 0x48, 0xFC
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};
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static const u8 secureinfoSigCheckPatch[] = {
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0x00, 0x26
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};
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//Disable SecureInfo signature check
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patchMemory(code, size,
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secureinfoSigCheckPattern,
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sizeof(secureinfoSigCheckPattern), 0,
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secureinfoSigCheckPatch,
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sizeof(secureinfoSigCheckPatch), 1
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);
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if(secureInfoExists())
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{
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static const u16 secureinfoFilenamePattern[] = u"SecureInfo_";
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static const u16 secureinfoFilenamePatch[] = u"C";
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//Use SecureInfo_C
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patchMemory(code, size,
|
|
secureinfoFilenamePattern,
|
|
sizeof(secureinfoFilenamePattern) - sizeof(u16),
|
|
sizeof(secureinfoFilenamePattern) - sizeof(u16),
|
|
secureinfoFilenamePatch,
|
|
sizeof(secureinfoFilenamePatch) - sizeof(u16), 2
|
|
);
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 0x0004013000003702LL: // RO
|
|
{
|
|
static const u8 sigCheckPattern[] = {
|
|
0x30, 0x40, 0x2D, 0xE9, 0x02
|
|
};
|
|
static const u8 sha256ChecksPattern1[] = {
|
|
0x30, 0x40, 0x2D, 0xE9, 0x24
|
|
};
|
|
static const u8 sha256ChecksPattern2[] = {
|
|
0xF8, 0x4F, 0x2D, 0xE9, 0x01
|
|
};
|
|
|
|
static const u8 stub[] = {
|
|
0x00, 0x00, 0xA0, 0xE3, 0x1E, 0xFF, 0x2F, 0xE1 // mov r0, #0; bx lr
|
|
};
|
|
|
|
//Disable CRR0 signature (RSA2048 with SHA256) check
|
|
patchMemory(code, size,
|
|
sigCheckPattern,
|
|
sizeof(sigCheckPattern), 0,
|
|
stub,
|
|
sizeof(stub), 1
|
|
);
|
|
|
|
//Disable CRO0/CRR0 SHA256 hash checks (section hashes, and hash table)
|
|
patchMemory(code, size,
|
|
sha256ChecksPattern1,
|
|
sizeof(sha256ChecksPattern1), 0,
|
|
stub,
|
|
sizeof(stub), 1
|
|
);
|
|
|
|
patchMemory(code, size,
|
|
sha256ChecksPattern2,
|
|
sizeof(sha256ChecksPattern2), 0,
|
|
stub,
|
|
sizeof(stub), 1
|
|
);
|
|
|
|
break;
|
|
}
|
|
|
|
|
|
case 0x0004003000008A02LL: // ErrDisp
|
|
{
|
|
if(MULTICONFIG(2) == 1)
|
|
{
|
|
static const u8 unitinfoCheckPattern1[] = {
|
|
0x14, 0x00, 0xD0, 0xE5, 0xDB, 0x9A, 0x9F, 0xED
|
|
};
|
|
|
|
static const u8 unitinfoCheckPattern2[] = {
|
|
0x14, 0x00, 0xD0, 0xE5, 0x01, 0x00, 0x10, 0xE3
|
|
} ;
|
|
|
|
static const u8 unitinfoCheckPatch[] = {
|
|
0x00, 0x00, 0xA0, 0xE3
|
|
} ;
|
|
|
|
patchMemory(code, size,
|
|
unitinfoCheckPattern1,
|
|
sizeof(unitinfoCheckPattern1), 0,
|
|
unitinfoCheckPatch,
|
|
sizeof(unitinfoCheckPatch), 1
|
|
);
|
|
|
|
patchMemory(code, size,
|
|
unitinfoCheckPattern2,
|
|
sizeof(unitinfoCheckPattern2), 0,
|
|
unitinfoCheckPatch,
|
|
sizeof(unitinfoCheckPatch), 3
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
if(CONFIG(3))
|
|
{
|
|
u32 tidHigh = (progId & 0xFFFFFFF000000000LL) >> 0x24;
|
|
|
|
if(tidHigh == 0x0004000)
|
|
{
|
|
//External .code section loading
|
|
loadTitleCodeSection(progId, code, size);
|
|
|
|
//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;
|
|
}
|
|
}
|