237 lines
7.5 KiB
C
237 lines
7.5 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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#include "config.h"
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#include "../build/rebootpatch.h"
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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 patchSignatureChecks(u8 *pos, u32 size)
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{
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const u16 sigPatch[2] = {0x2000, 0x4770};
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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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u16 *off = (u16 *)memsearch(pos, pattern, size, 4),
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*off2 = (u16 *)(memsearch(pos, pattern2, size, 4) - 1);
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*off = sigPatch[0];
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off2[0] = sigPatch[0];
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off2[1] = sigPatch[1];
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}
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void patchFirmlaunches(u8 *pos, u32 size, u32 process9MemAddr)
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{
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//Look for firmlaunch 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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u32 fOpenOffset = (u32)(off + 9 - (-((*(u32 *)off & 0x00FFFFFF) << 2) & (0xFFFFFF << 2)) - pos + process9MemAddr);
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//Copy firmlaunch code
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memcpy(off, reboot, reboot_size);
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//Put the fOpen offset in the right location
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u32 *pos_fopen = (u32 *)memsearch(off, "OPEN", reboot_size, 4);
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*pos_fopen = fOpenOffset;
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}
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void patchFirmWrites(u8 *pos, u32 size)
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{
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const u16 writeBlock[2] = {0x2000, 0x46C0};
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//Look for FIRM writing code
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u8 *const off1 = memsearch(pos, "exe:", size, 4);
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const u8 pattern[] = {0x00, 0x28, 0x01, 0xDA};
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u16 *off2 = (u16 *)memsearch(off1 - 0x100, pattern, 0x100, 4);
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off2[0] = writeBlock[0];
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off2[1] = writeBlock[1];
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}
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void patchFirmWriteSafe(u8 *pos, u32 size)
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{
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const u16 writeBlockSafe[2] = {0x2400, 0xE01D};
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//Look for FIRM writing code
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const u8 pattern[] = {0x04, 0x1E, 0x1D, 0xDB};
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u16 *off = (u16 *)memsearch(pos, pattern, size, 4);
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off[0] = writeBlockSafe[0];
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off[1] = writeBlockSafe[1];
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}
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void patchExceptionHandlersInstall(u8 *pos, u32 size)
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{
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const u8 pattern[] = {
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0x18, 0x10, 0x80, 0xE5,
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0x10, 0x10, 0x80, 0xE5,
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0x20, 0x10, 0x80, 0xE5,
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0x28, 0x10, 0x80, 0xE5,
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}; //i.e when it stores ldr pc, [pc, #-4]
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u32* off = (u32 *)(memsearch(pos, pattern, size, sizeof(pattern)));
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if(off == NULL) return;
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off += sizeof(pattern)/4;
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u32 r0 = 0x08000000;
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for(; *off != 0xE3A01040; off++) //Until mov r1, #0x40
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{
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if((*off >> 26) != 0x39 || ((*off >> 16) & 0xF) != 0 || ((*off >> 25) & 1) != 0 || ((*off >> 20) & 5) != 0)
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continue; //Discard everything that's not str rX, [r0, #imm](!)
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int rD = (*off >> 12) & 0xF,
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offset = (*off & 0xFFF) * ((((*off >> 23) & 1) == 0) ? -1 : 1),
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writeback = (*off >> 21) & 1,
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pre = (*off >> 24) & 1;
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u32 addr = r0 + ((pre || !writeback) ? offset : 0);
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if(addr != 0x08000014 && addr != 0x08000004)
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*off = 0xE1A00000; //nop
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else
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*off = 0xE5800000 | (rD << 12) | (addr & 0xFFF); //Preserve IRQ and SVC handlers
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if(!pre) addr += offset;
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if(writeback) r0 = addr;
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}
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}
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void patchUnitInfoValueSet(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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u8 *off = memsearch(pos, pattern, size, 4);
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off[3] = 0xE3;
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}
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void patchKernelFCRAMAndVRAMMappingPermissions(u8 *pos, u32 size)
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{
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//Look for MMU config
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const u8 pattern[] = {0x97, 0x05, 0x00, 0x00, 0x15, 0xE4, 0x00, 0x00};
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u32 *off = (u32 *)memsearch(pos, pattern, size, 8);
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while(off != NULL && *off != 0x16416) off--;
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if(off != NULL) *off &= ~(1 << 4); //Clear XN bit
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}
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void reimplementSvcBackdoor(u8 *pos, u32 size)
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{
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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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const u8 pattern[] = {0x00, 0xB0, 0x9C, 0xE5}; //cpsid aif
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u32 *exceptionsPage = (u32 *)memsearch(pos, pattern, size, 4) - 0xB;
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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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if(!svcTable[0x7B])
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{
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u32 *freeSpace;
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for(freeSpace = exceptionsPage; *freeSpace != 0xFFFFFFFF; freeSpace++);
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memcpy(freeSpace, svcBackdoor, 40);
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svcTable[0x7B] = 0xFFFF0000 + ((u8 *)freeSpace - (u8 *)exceptionsPage);
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}
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}
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void patchTitleInstallMinVersionCheck(u8 *pos, u32 size)
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{
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const u8 pattern[] = {0x0A, 0x81, 0x42, 0x02};
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u8 *off = memsearch(pos, pattern, size, 4);
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if(off != NULL) off[4] = 0xE0;
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}
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void applyLegacyFirmPatches(u8 *pos, u32 firmType, u32 console)
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{
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const patchData twlPatches[] = {
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{{0x1650C0, 0x165D64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
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{{0x173A0E, 0x17474A}, { .type1 = 0x2001 }, 1},
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{{0x174802, 0x17553E}, { .type1 = 0x2000 }, 2},
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{{0x174964, 0x1756A0}, { .type1 = 0x2000 }, 2},
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{{0x174D52, 0x175A8E}, { .type1 = 0x2001 }, 2},
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{{0x174D5E, 0x175A9A}, { .type1 = 0x2001 }, 2},
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{{0x174D6A, 0x175AA6}, { .type1 = 0x2001 }, 2},
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{{0x174E56, 0x175B92}, { .type1 = 0x2001 }, 1},
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{{0x174E58, 0x175B94}, { .type1 = 0x4770 }, 1}
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},
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agbPatches[] = {
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{{0x9D2A8, 0x9DF64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
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{{0xD7A12, 0xD8B8A}, { .type1 = 0xEF26 }, 1}
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};
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/* Calculate the amount of patches to apply. Only count the boot screen patch for AGB_FIRM
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if the matching option was enabled (keep it as last) */
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u32 numPatches = firmType == 1 ? (sizeof(twlPatches) / sizeof(patchData)) :
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(sizeof(agbPatches) / sizeof(patchData) - !CONFIG(6));
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const patchData *patches = firmType == 1 ? twlPatches : agbPatches;
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//Patch
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for(u32 i = 0; i < numPatches; i++)
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{
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switch(patches[i].type)
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{
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case 0:
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memcpy(pos + patches[i].offset[console], patches[i].patch.type0 + 1, patches[i].patch.type0[0]);
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break;
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case 2:
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*(u16 *)(pos + patches[i].offset[console] + 2) = 0;
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case 1:
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*(u16 *)(pos + patches[i].offset[console]) = patches[i].patch.type1;
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break;
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}
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}
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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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} |