108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* patches.c
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*/
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#include "patches.h"
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#include "memory.h"
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/**************************************************
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* Patches
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**************************************************/
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const u32 mpuPatch[3] = {0x00360003, 0x00200603, 0x001C0603};
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const u16 nandRedir[2] = {0x4C00, 0x47A0},
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sigPatch[2] = {0x2000, 0x4770},
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writeBlock[2] = {0x2000, 0x46C0},
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writeBlockSafe[2] = {0x2400, 0xE01D};
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const u8 unitInfoPatch = 0xE3;
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/**************************************************
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* Functions
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**************************************************/
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u8 *getProc9(u8 *pos, u32 size)
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{
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return memsearch(pos, "ess9", size, 4);
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}
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void getSigChecks(u8 *pos, u32 size, u32 *off, u32 *off2)
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{
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//Look for signature checks
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const u8 pattern[] = {0xC0, 0x1C, 0x76, 0xE7},
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pattern2[] = {0xB5, 0x22, 0x4D, 0x0C};
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*off = (u32)memsearch(pos, pattern, size, 4);
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*off2 = (u32)memsearch(pos, pattern2, size, 4) - 1;
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}
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void *getReboot(u8 *pos, u32 size)
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{
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//Look for FIRM reboot code
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const u8 pattern[] = {0xDE, 0x1F, 0x8D, 0xE2};
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return memsearch(pos, pattern, size, 4) - 0x10;
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}
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u32 getfOpen(u8 *proc9Offset, void *rebootOffset)
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{
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//Offset Process9 code gets loaded to in memory (defined in ExHeader)
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u32 p9MemAddr = *(u32 *)(proc9Offset + 0xC);
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//Process9 code offset (start of NCCH + ExeFS offset + ExeFS header size)
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u32 p9CodeOff = (u32)(proc9Offset - 0x204) + (*(u32 *)(proc9Offset - 0x64) * 0x200) + 0x200;
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//Firmlaunch function offset - offset in BLX opcode (A4-16 - ARM DDI 0100E) + 1
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return (u32)rebootOffset + 9 - (-((*(u32 *)rebootOffset & 0x00FFFFFF) << 2) & 0xFFFFF) - p9CodeOff + p9MemAddr;
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}
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u16 *getFirmWrite(u8 *pos, u32 size)
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{
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//Look for FIRM writing code
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u8 *const off = memsearch(pos, "exe:", size, 4);
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const u8 pattern[] = {0x00, 0x28, 0x01, 0xDA};
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return (u16 *)memsearch(off - 0x100, pattern, 0x100, 4);
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}
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u16 *getFirmWriteSafe(u8 *pos, u32 size)
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{
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//Look for FIRM writing code
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const u8 pattern[] = {0x04, 0x1E, 0x1D, 0xDB};
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return (u16 *)memsearch(pos, pattern, size, 4);
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}
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u8 *getUnitInfoValueSet(u8 *pos, u32 size)
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{
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//Look for UNITINFO value being set
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const u8 pattern[] = {0x01, 0x10, 0xA0, 0x13};
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return memsearch(pos, pattern, size, 4) + 3;
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}
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u32 getLoader(u8 *pos, u32 *loaderSize)
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{
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u8 *off = pos;
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u32 size;
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while(1)
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{
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size = *(u32 *)(off + 0x104) * 0x200;
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if(*(u32 *)(off + 0x200) == 0x64616F6C) break;
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off += size;
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}
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*loaderSize = size;
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return (u32)(off - pos);
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}
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u32* getExceptionVectorsPage(u8 *pos, u32 size)
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{
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const u8 pattern[] = {0x00,0xB0,0x9C,0xE5,0x0A,0xB0,0x0B,0xE0,0x0A,0x00,0x5B,0xE1,0xFB,0xFF,0xFF,0x1A};
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return (u32 *)(memsearch(pos, pattern, size, 16) - 0x2C);
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}
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