This repository has been archived on 2022-05-31. You can view files and clone it, but cannot push or open issues or pull requests.
Luma3DS-3GX/source/patches.c

180 lines
5.9 KiB
C
Raw Normal View History

/*
* patches.c
*/
#include "patches.h"
2016-02-08 03:37:03 +01:00
#include "memory.h"
#include "config.h"
#include "../build/rebootpatch.h"
u8 *getProcess9(u8 *pos, u32 size, u32 *process9Size, u32 *process9MemAddr)
{
u8 *off = memsearch(pos, "ess9", size, 4);
2016-05-12 02:59:21 +02:00
*process9Size = *(u32 *)(off - 0x60) * 0x200;
*process9MemAddr = *(u32 *)(off + 0xC);
//Process9 code offset (start of NCCH + ExeFS offset + ExeFS header size)
return off - 0x204 + (*(u32 *)(off - 0x64) * 0x200) + 0x200;
}
void patchSignatureChecks(u8 *pos, u32 size)
{
const u16 sigPatch[2] = {0x2000, 0x4770};
2016-02-08 03:37:03 +01:00
//Look for signature checks
const u8 pattern[] = {0xC0, 0x1C, 0x76, 0xE7},
pattern2[] = {0xB5, 0x22, 0x4D, 0x0C};
u16 *off = (u16 *)memsearch(pos, pattern, size, 4),
*off2 = (u16 *)(memsearch(pos, pattern2, size, 4) - 1);
*off = sigPatch[0];
off2[0] = sigPatch[0];
off2[1] = sigPatch[1];
}
void patchFirmlaunches(u8 *pos, u32 size, u32 process9MemAddr)
{
2016-05-27 04:16:49 +02:00
//Look for firmlaunch code
2016-03-26 19:21:17 +01:00
const u8 pattern[] = {0xDE, 0x1F, 0x8D, 0xE2};
u8 *off = memsearch(pos, pattern, size, 4) - 0x10;
//Firmlaunch function offset - offset in BLX opcode (A4-16 - ARM DDI 0100E) + 1
u32 fOpenOffset = (u32)(off + 9 - (-((*(u32 *)off & 0x00FFFFFF) << 2) & (0xFFFFFF << 2)) - pos + process9MemAddr);
//Copy firmlaunch code
memcpy(off, reboot, reboot_size);
//Put the fOpen offset in the right location
u32 *pos_fopen = (u32 *)memsearch(off, "OPEN", reboot_size, 4);
*pos_fopen = fOpenOffset;
}
void patchFirmWrites(u8 *pos, u32 size)
{
const u16 writeBlock[2] = {0x2000, 0x46C0};
//Look for FIRM writing code
u8 *const off1 = memsearch(pos, "exe:", size, 4);
2016-03-26 19:21:17 +01:00
const u8 pattern[] = {0x00, 0x28, 0x01, 0xDA};
u16 *off2 = (u16 *)memsearch(off1 - 0x100, pattern, 0x100, 4);
off2[0] = writeBlock[0];
off2[1] = writeBlock[1];
}
void patchFirmWriteSafe(u8 *pos, u32 size)
{
const u16 writeBlockSafe[2] = {0x2400, 0xE01D};
//Look for FIRM writing code
const u8 pattern[] = {0x04, 0x1E, 0x1D, 0xDB};
u16 *off = (u16 *)memsearch(pos, pattern, size, 4);
off[0] = writeBlockSafe[0];
off[1] = writeBlockSafe[1];
}
void reimplementSvcBackdoor(u8 *pos, u32 size)
{
//Official implementation of svcBackdoor
const u8 svcBackdoor[40] = {0xFF, 0x10, 0xCD, 0xE3, //bic r1, sp, #0xff
0x0F, 0x1C, 0x81, 0xE3, //orr r1, r1, #0xf00
0x28, 0x10, 0x81, 0xE2, //add r1, r1, #0x28
0x00, 0x20, 0x91, 0xE5, //ldr r2, [r1]
0x00, 0x60, 0x22, 0xE9, //stmdb r2!, {sp, lr}
0x02, 0xD0, 0xA0, 0xE1, //mov sp, r2
0x30, 0xFF, 0x2F, 0xE1, //blx r0
0x03, 0x00, 0xBD, 0xE8, //pop {r0, r1}
0x00, 0xD0, 0xA0, 0xE1, //mov sp, r0
0x11, 0xFF, 0x2F, 0xE1}; //bx r1
const u8 pattern[] = {0x00, 0xB0, 0x9C, 0xE5}; //cpsid aif
u32 *exceptionsPage = (u32 *)memsearch(pos, pattern, size, 4) - 0xB;
u32 svcOffset = (-((exceptionsPage[2] & 0xFFFFFF) << 2) & (0xFFFFFF << 2)) - 8; //Branch offset + 8 for prefetch
u32 *svcTable = (u32 *)(pos + *(u32 *)(pos + 0xFFFF0008 - svcOffset - 0xFFF00000 + 8) - 0xFFF00000); //SVC handler address
while(*svcTable) svcTable++; //Look for SVC0 (NULL)
if(!svcTable[0x7B])
{
u32 *freeSpace;
for(freeSpace = exceptionsPage; *freeSpace != 0xFFFFFFFF; freeSpace++);
memcpy(freeSpace, svcBackdoor, 40);
svcTable[0x7B] = 0xFFFF0000 + ((u8 *)freeSpace - (u8 *)exceptionsPage);
}
}
2016-05-27 04:16:49 +02:00
void patchTitleInstallMinVersionCheck(u8 *pos, u32 size)
{
const u8 pattern[] = {0x0A, 0x81, 0x42, 0x02};
u8 *off = memsearch(pos, pattern, size, 4);
if(off != NULL) off[4] = 0xE0;
}
void applyLegacyFirmPatches(u8 *pos, FirmwareType firmType, bool isN3DS)
{
const patchData twlPatches[] = {
{{0x1650C0, 0x165D64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
{{0x173A0E, 0x17474A}, { .type1 = 0x2001 }, 1},
{{0x174802, 0x17553E}, { .type1 = 0x2000 }, 2},
{{0x174964, 0x1756A0}, { .type1 = 0x2000 }, 2},
{{0x174D52, 0x175A8E}, { .type1 = 0x2001 }, 2},
{{0x174D5E, 0x175A9A}, { .type1 = 0x2001 }, 2},
{{0x174D6A, 0x175AA6}, { .type1 = 0x2001 }, 2},
{{0x174E56, 0x175B92}, { .type1 = 0x2001 }, 1},
{{0x174E58, 0x175B94}, { .type1 = 0x4770 }, 1}
},
agbPatches[] = {
{{0x9D2A8, 0x9DF64}, {{ 6, 0x00, 0x20, 0x4E, 0xB0, 0x70, 0xBD }}, 0},
{{0xD7A12, 0xD8B8A}, { .type1 = 0xEF26 }, 1}
};
/* Calculate the amount of patches to apply. Only count the boot screen patch for AGB_FIRM
if the matching option was enabled (keep it as last) */
2016-06-12 22:14:52 +02:00
u32 numPatches = firmType == TWL_FIRM ? (sizeof(twlPatches) / sizeof(patchData)) :
(sizeof(agbPatches) / sizeof(patchData) - !CONFIG(6));
const patchData *patches = firmType == TWL_FIRM ? twlPatches : agbPatches;
//Patch
for(u32 i = 0; i < numPatches; i++)
{
switch(patches[i].type)
{
case 0:
memcpy(pos + patches[i].offset[isN3DS ? 1 : 0], patches[i].patch.type0 + 1, patches[i].patch.type0[0]);
break;
case 2:
*(u16 *)(pos + patches[i].offset[isN3DS ? 1 : 0] + 2) = 0;
case 1:
*(u16 *)(pos + patches[i].offset[isN3DS ? 1 : 0]) = patches[i].patch.type1;
break;
}
}
}
u32 getLoader(u8 *pos, u32 *loaderSize)
2016-04-11 21:14:51 +02:00
{
u8 *off = pos;
u32 size;
while(1)
{
size = *(u32 *)(off + 0x104) * 0x200;
if(*(u32 *)(off + 0x200) == 0x64616F6C) break;
off += size;
}
*loaderSize = size;
return (u32)(off - pos);
}