/* * This file is part of Luma3DS * Copyright (C) 2016 Aurora Wright, TuxSH * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . * * Additional Terms 7.b of GPLv3 applies to this file: Requiring preservation of specified * reasonable legal notices or author attributions in that material or in the Appropriate Legal * Notices displayed by works containing it. */ #include "patches.h" #include "memory.h" #include "config.h" #include "../build/rebootpatch.h" #include "../build/svcGetCFWInfopatch.h" #include "../build/twl_k11modulespatch.h" static u32 *arm11ExceptionsPage = NULL; static u32 *arm11SvcTable = NULL; static u32 *arm11SvcHandler = NULL; static u8 *freeK11Space = NULL; //other than the one used for svcBackdoor static void findArm11ExceptionsPageAndSvcHandlerAndTable(u8 *pos, u32 size) { const u8 arm11ExceptionsPagePattern[] = {0x00, 0xB0, 0x9C, 0xE5}; if(arm11ExceptionsPage == NULL) arm11ExceptionsPage = (u32 *)memsearch(pos, arm11ExceptionsPagePattern, size, 4) - 0xB; if((arm11SvcTable == NULL || arm11SvcHandler == NULL) && arm11ExceptionsPage != NULL) { u32 svcOffset = (-((arm11ExceptionsPage[2] & 0xFFFFFF) << 2) & (0xFFFFFF << 2)) - 8; //Branch offset + 8 for prefetch arm11SvcHandler = arm11SvcTable = (u32 *)(pos + *(u32 *)(pos + 0xFFFF0008 - svcOffset - 0xFFF00000 + 8) - 0xFFF00000); //SVC handler address while(*arm11SvcTable) arm11SvcTable++; //Look for SVC0 (NULL) } } static void findFreeK11Space(u8 *pos, u32 size) { if(freeK11Space == NULL) { const u8 bogus_pattern[] = { 0x1E, 0xFF, 0x2F, 0xE1, 0x1E, 0xFF, 0x2F, 0xE1, 0x1E, 0xFF, 0x2F, 0xE1, 0x00, 0x10, 0xA0, 0xE3, 0x00, 0x10, 0xC0, 0xE5, 0x1E, 0xFF, 0x2F, 0xE1 }; u32 *someSpace = (u32 *)memsearch(pos, bogus_pattern, size, 24); // We couldn't find the place where to begin our search of an empty block if (someSpace == NULL) return; // Advance until we reach the padding area (filled with 0xFF) u32 *freeSpace; for(freeSpace = someSpace; *freeSpace != 0xFFFFFFFF; freeSpace++); freeK11Space = (u8 *)freeSpace; } } u8 *getProcess9(u8 *pos, u32 size, u32 *process9Size, u32 *process9MemAddr) { u8 *off = memsearch(pos, "ess9", size, 4); *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}; //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) { //Look for firmlaunch code const u8 pattern[] = {0xE2, 0x20, 0x20, 0x90}; u8 *off = memsearch(pos, pattern, size, 4) - 0x13; //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); 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 findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size); if(!arm11SvcTable[0x7B]) { u32 *freeSpace; for(freeSpace = arm11ExceptionsPage; *freeSpace != 0xFFFFFFFF; freeSpace++); memcpy(freeSpace, svcBackdoor, 40); arm11SvcTable[0x7B] = 0xFFFF0000 + ((u8 *)freeSpace - (u8 *)arm11ExceptionsPage); } } void implementSvcGetCFWInfo(u8 *pos, u32 size) { const char *rev = REVISION; bool isRelease; findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size); findFreeK11Space(pos, size); memcpy(freeK11Space, svcGetCFWInfo, svcGetCFWInfo_size); CFWInfo *info = (CFWInfo *)memsearch(freeK11Space, "LUMA", svcGetCFWInfo_size, 4); info->commitHash = COMMIT_HASH; info->config = configData.config; info->versionMajor = (u8)(rev[1] - '0'); info->versionMinor = (u8)(rev[3] - '0'); if(rev[4] == '.') { info->versionBuild = (u8)(rev[5] - '0'); isRelease = rev[6] == 0; } else isRelease = rev[4] == 0; info->flags = 0 /* master branch */ | (((isRelease) ? 1 : 0) << 1) /* is release */; arm11SvcTable[0x2E] = 0xFFF00000 + freeK11Space - pos; //stubbed svc freeK11Space += svcGetCFWInfo_size; } 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) { 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) */ 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; } } } void patchTwlBg(u8 *pos) { u8 *dst = pos + ((isN3DS) ? 0xFEA4 : 0xFCA0); u16 *src1 = (u16 *)(pos + ((isN3DS) ? 0xE38 : 0xE3C)), *src2 = (u16 *)(pos + ((isN3DS) ? 0xE54 : 0xE58)); memcpy(dst, twl_k11modules, twl_k11modules_size); //install k11 hook u32 *off; for(off = (u32 *)dst; *off != 0xABCDABCD; off++); *off = (isN3DS) ? 0xCDE88 : 0xCD5F8; //dev SRL launcher offset //Construct BLX instructions: src1[0] = 0xF000 | ((((u32)dst - (u32)src1 - 4) & (0xFFF << 11)) >> 12); src1[1] = 0xE800 | ((((u32)dst - (u32)src1 - 4) & 0xFFF) >> 1); src2[0] = 0xF000 | ((((u32)dst - (u32)src2 - 4) & (0xFFF << 11)) >> 12); src2[1] = 0xE800 | ((((u32)dst - (u32)src2 - 4) & 0xFFF) >> 1); }