124 lines
3.8 KiB
C
124 lines
3.8 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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//Official implementation of svcBackdoor
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const u8 svcBackdoor[40] = {0xFF, 0x10, 0xCD, 0xE3, //bic r1, sp, #0xff
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0x0F, 0x1C, 0x81, 0xE3, //orr r1, r1, #0xf00
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0x28, 0x10, 0x81, 0xE2, //add r1, r1, #0x28
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0x00, 0x20, 0x91, 0xE5, //ldr r2, [r1]
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0x00, 0x60, 0x22, 0xE9, //stmdb r2!, {sp, lr}
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0x02, 0xD0, 0xA0, 0xE1, //mov sp, r2
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0x30, 0xFF, 0x2F, 0xE1, //blx r0
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0x03, 0x00, 0xBD, 0xE8, //pop {r0, r1}
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0x00, 0xD0, 0xA0, 0xE1, //mov sp, r0
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0x11, 0xFF, 0x2F, 0xE1}; //bx r1
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/**************************************************
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* Functions
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**************************************************/
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u8 *getProcess9(u8 *pos, u32 size, u32 *process9Size, u32 *process9MemAddr)
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{
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u8 *off = memsearch(pos, "ess9", size, 4);
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*process9Size = *(u32 *)(off - 0x60) * 0x200;
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*process9MemAddr = *(u32 *)(off + 0xC);
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//Process9 code offset (start of NCCH + ExeFS offset + ExeFS header size)
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return off - 0x204 + (*(u32 *)(off - 0x64) * 0x200) + 0x200;
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}
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void getSigChecks(u8 *pos, u32 size, u16 **off, u16 **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 = (u16 *)memsearch(pos, pattern, size, 4);
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*off2 = (u16 *)(memsearch(pos, pattern2, size, 4) - 1);
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}
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void *getReboot(u8 *pos, u32 size, u32 process9MemAddr, u32 *fOpenOffset)
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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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u8 *off = memsearch(pos, pattern, size, 4) - 0x10;
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//Firmlaunch function offset - offset in BLX opcode (A4-16 - ARM DDI 0100E) + 1
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*fOpenOffset = (u32)(off + 9 - (-((*(u32 *)off & 0x00FFFFFF) << 2) & (0xFFFFFF << 2)) - pos + process9MemAddr);
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return off;
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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 *getSvcAndExceptions(u8 *pos, u32 size, u32 **exceptionsPage)
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{
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const u8 pattern[] = {0x00, 0xB0, 0x9C, 0xE5}; //cpsid aif
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*exceptionsPage = (u32 *)(memsearch(pos, pattern, size, 4) - 0x2C);
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u32 svcOffset = (-(((*exceptionsPage)[2] & 0xFFFFFF) << 2) & (0xFFFFFF << 2)) - 8; //Branch offset + 8 for prefetch
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u32 *svcTable = (u32 *)(pos + *(u32 *)(pos + 0xFFFF0008 - svcOffset - 0xFFF00000 + 8) - 0xFFF00000); //SVC handler address
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while(*svcTable) svcTable++; //Look for SVC0 (NULL)
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return svcTable;
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} |