235 lines
8.2 KiB
C
235 lines
8.2 KiB
C
/*
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* This file is part of Luma3DS
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* Copyright (C) 2016 Aurora Wright, TuxSH
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified
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* reasonable legal notices or author attributions in that material or in the Appropriate Legal
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* Notices displayed by works containing it.
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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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#include "../build/svcGetCFWInfopatch.h"
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#include "../build/twl_k11modulespatch.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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u32 *getKernel11Info(u8 *pos, u32 size, u8 **freeK11Space)
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{
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const u8 pattern[] = {0x00, 0xB0, 0x9C, 0xE5};
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u32 *arm11ExceptionsPage = (u32 *)memsearch(pos, pattern, size, 4) - 0xB;
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u32 svcOffset = (-((arm11ExceptionsPage[2] & 0xFFFFFF) << 2) & (0xFFFFFF << 2)) - 8; //Branch offset + 8 for prefetch
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u32 *arm11SvcTable = (u32 *)(pos + *(u32 *)(pos + 0xFFFF0008 - svcOffset - 0xFFF00000 + 8) - 0xFFF00000); //SVC handler address
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while(*arm11SvcTable) arm11SvcTable++; //Look for SVC0 (NULL)
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const u8 pattern2[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
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*freeK11Space = memsearch(pos, pattern2, size, 5) + 1;
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return arm11SvcTable;
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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[] = {0xE2, 0x20, 0x20, 0x90};
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u8 *off = memsearch(pos, pattern, size, 4) - 0x13;
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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 patchOldFirmWrites(u8 *pos, u32 size)
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{
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const u16 writeBlockOld[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] = writeBlockOld[0];
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off[1] = writeBlockOld[1];
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}
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void reimplementSvcBackdoor(u8 *pos, u32 *arm11SvcTable, u8 **freeK11Space)
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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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if(!arm11SvcTable[0x7B])
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{
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memcpy(*freeK11Space, svcBackdoor, 40);
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arm11SvcTable[0x7B] = 0xFFF00000 + *freeK11Space - pos;
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(*freeK11Space) += 40;
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}
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}
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void implementSvcGetCFWInfo(u8 *pos, u32 *arm11SvcTable, u8 **freeK11Space)
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{
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memcpy(*freeK11Space, svcGetCFWInfo, svcGetCFWInfo_size);
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CFWInfo *info = (CFWInfo *)memsearch(*freeK11Space, "LUMA", svcGetCFWInfo_size, 4);
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const char *rev = REVISION;
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bool isRelease;
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info->commitHash = COMMIT_HASH;
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info->config = configData.config;
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info->versionMajor = (u8)(rev[1] - '0');
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info->versionMinor = (u8)(rev[3] - '0');
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if(rev[4] == '.')
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{
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info->versionBuild = (u8)(rev[5] - '0');
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isRelease = rev[6] == 0;
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}
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else isRelease = rev[4] == 0;
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info->flags = 0 /* master branch */ | ((isRelease ? 1 : 0) << 1) /* is release */;
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arm11SvcTable[0x2E] = 0xFFF00000 + *freeK11Space - pos; //Stubbed svc
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(*freeK11Space) += svcGetCFWInfo_size;
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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, FirmwareType firmType)
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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 == TWL_FIRM ? (sizeof(twlPatches) / sizeof(patchData)) :
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(sizeof(agbPatches) / sizeof(patchData) - !CONFIG(6));
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const patchData *patches = firmType == TWL_FIRM ? 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[isN3DS ? 1 : 0], 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[isN3DS ? 1 : 0] + 2) = 0;
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case 1:
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*(u16 *)(pos + patches[i].offset[isN3DS ? 1 : 0]) = 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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void patchTwlBg(u8 *pos)
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{
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u8 *dst = pos + (isN3DS ? 0xFEA4 : 0xFCA0);
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memcpy(dst, twl_k11modules, twl_k11modules_size); //Install K11 hook
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u32 *off = (u32 *)memsearch(dst, "LAUN", twl_k11modules_size, 4);
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*off = isN3DS ? 0xCDE88 : 0xCD5F8; //Dev SRL launcher offset
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u16 *src1 = (u16 *)(pos + (isN3DS ? 0xE38 : 0xE3C)),
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*src2 = (u16 *)(pos + (isN3DS ? 0xE54 : 0xE58));
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//Construct BLX instructions:
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src1[0] = 0xF000 | ((((u32)dst - (u32)src1 - 4) & (0xFFF << 11)) >> 12);
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src1[1] = 0xE800 | ((((u32)dst - (u32)src1 - 4) & 0xFFF) >> 1);
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src2[0] = 0xF000 | ((((u32)dst - (u32)src2 - 4) & (0xFFF << 11)) >> 12);
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src2[1] = 0xE800 | ((((u32)dst - (u32)src2 - 4) & 0xFFF) >> 1);
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} |