369 lines
13 KiB
C
369 lines
13 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/k11modulespatch.h"
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static u32 *arm11ExceptionsPage = NULL;
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static u32 *arm11SvcTable = NULL;
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static u32 *arm11SvcHandler = NULL;
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static void findArm11ExceptionsPageAndSvcHandlerAndTable(u8 *pos, u32 size)
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{
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const u8 arm11ExceptionsPagePattern[] = {0x00, 0xB0, 0x9C, 0xE5};
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if(arm11ExceptionsPage == NULL) arm11ExceptionsPage = (u32 *)memsearch(pos, arm11ExceptionsPagePattern, size, 4) - 0xB;
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if((arm11SvcTable == NULL || arm11SvcHandler == NULL) && arm11ExceptionsPage != NULL)
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{
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u32 svcOffset = (-((arm11ExceptionsPage[2] & 0xFFFFFF) << 2) & (0xFFFFFF << 2)) - 8; //Branch offset + 8 for prefetch
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arm11SvcHandler = 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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}
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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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u32* getInfoForArm11ExceptionHandlers(u8 *pos, u32 size, u32 *stackAddr, u32 *codeSetOffset)
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{
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//This function has to succeed. Crash if it doesn't (we'll get an exception dump of it anyways)
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const u8 callExceptionDispatcherPattern[] = {0x0F, 0x00, 0xBD, 0xE8, 0x13, 0x00, 0x02, 0xF1};
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const u8 getTitleIDFromCodeSetPattern[] = {0xDC, 0x05, 0xC0, 0xE1, 0x20, 0x04, 0xA0, 0xE1};
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*stackAddr = *((u32 *)memsearch(pos, callExceptionDispatcherPattern, size, 8) + 3);
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u32 *loadCodeSet = (u32 *)memsearch(pos, getTitleIDFromCodeSetPattern, size, 8);
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while((*loadCodeSet >> 20) != 0xE59 || ((*loadCodeSet >> 12) & 0xF) != 0) //ldr r0, [rX, #offset]
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loadCodeSet--;
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*codeSetOffset = *loadCodeSet & 0xFFF;
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findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size);
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return arm11ExceptionsPage;
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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 & 7) != 0 && 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 patchSvcBreak9(u8 *pos, u32 size, u32 k9addr)
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{
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//Stub svcBreak with "bkpt 65535" so we can debug the panic.
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//Thanks @yellows8 and others for mentioning this idea on #3dsdev.
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const u8 svcHandlerPattern[] = {0x00, 0xE0, 0x4F, 0xE1}; //mrs lr, spsr
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u32 *arm9SvcTable = (u32 *)memsearch(pos, svcHandlerPattern, size, 4);
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while(*arm9SvcTable) arm9SvcTable++; //Look for SVC0 (NULL)
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u32 *addr = (u32 *)(pos + arm9SvcTable[0x3C] - k9addr);
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*addr = 0xE12FFF7F;
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}
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void patchSvcBreak11(u8 *pos, u32 size)
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{
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//Same as above, for NFIRM arm11
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findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size);
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u32 *addr = (u32 *)(pos + arm11SvcTable[0x3C] - 0xFFF00000);
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*addr = 0xE12FFF7F;
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}
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void patchKernel9Panic(u8 *pos, u32 size)
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{
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const u8 pattern[] = {0x00, 0x20, 0xA0, 0xE3, 0x02, 0x30, 0xA0, 0xE1, 0x02, 0x10, 0xA0, 0xE1, 0x05, 0x00, 0xA0, 0xE3};
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u32 *off = (u32 *)memsearch(pos, pattern, size, 16);
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*off = 0xE12FFF7E;
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}
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void patchKernel11Panic(u8 *pos, u32 size)
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{
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const u8 pattern[] = {0x02, 0x0B, 0x44, 0xE2, 0x00, 0x10, 0x90, 0xE5};
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u32 *off = (u32 *)memsearch(pos, pattern, size, 8);
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*off = 0xE12FFF7E;
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}
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void patchArm11SvcAccessChecks(u8 *pos, u32 size)
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{
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findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size);
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u32 *off = arm11SvcHandler;
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while(*off != 0xE11A0E1B) off++; //TST R10, R11,LSL LR
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*off = 0xE3B0A001; //MOVS R10, #1
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}
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//It's mainly Subv's code here:
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void patchK11ModuleChecks(u8 *pos, u32 size)
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{
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// We have to detour a function in the ARM11 kernel because builtin modules
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// are compressed in memory and are only decompressed at runtime.
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// Find some padding space to add our code
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const u8 bogus_pattern[] = { 0x1E, 0xFF, 0x2F, 0xE1, 0x1E, 0xFF, 0x2F, 0xE1, 0x1E, 0xFF,
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0x2F, 0xE1, 0x00, 0x10, 0xA0, 0xE3, 0x00, 0x10, 0xC0, 0xE5,
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0x1E, 0xFF, 0x2F, 0xE1 };
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u32 *someSpace = (u32 *)memsearch(pos, bogus_pattern, size, 24);
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// We couldn't find the place where to begin our search of an empty block
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if (someSpace == NULL)
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return;
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// Advance until we reach the padding area (filled with 0xFF)
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u32 *freeSpace;
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for(freeSpace = someSpace; *freeSpace != 0xFFFFFFFF; freeSpace++);
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// Inject our code into the free space
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memcpy(freeSpace, k11modules, k11modules_size);
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// Find the code that decompresses the .code section of the builtin modules and detour it with a jump to our code
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const u8 pattern[] = { 0x00, 0x00, 0x94, 0xE5, 0x18, 0x10, 0x90, 0xE5, 0x28, 0x20,
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0x90, 0xE5, 0x48, 0x00, 0x9D, 0xE5 };
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u8 *off = memsearch(pos, pattern, size, 16);
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// We couldn't find the code that decompresses the module
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if (off == NULL)
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return;
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// Inject a jump instruction to our code at the offset we found
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// Construct a jump (BL) instruction to our code
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u32 offset = ((((u32)freeSpace) - ((u32)off + 8)) >> 2) & 0xFFFFFF;
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u32 instruction = offset | (1 << 24) | (0x5 << 25) | (0xE << 28);
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// Write our jump
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memcpy(off, &instruction, 4);
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}
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void patchP9AccessChecks(u8 *pos, u32 size)
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{
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const u8 pattern[] = {0xE0, 0x00, 0x40, 0x39, 0x08, 0x58};
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u16 *off = (u16 *)memsearch(pos, pattern, size, 6) - 7;
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off[0] = 0x2001; //mov r0, #1
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off[1] = 0x4770; //bx lr
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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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findArm11ExceptionsPageAndSvcHandlerAndTable(pos, size);
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if(!arm11SvcTable[0x7B])
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{
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u32 *freeSpace;
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for(freeSpace = arm11ExceptionsPage; *freeSpace != 0xFFFFFFFF; freeSpace++);
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memcpy(freeSpace, svcBackdoor, 40);
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arm11SvcTable[0x7B] = 0xFFFF0000 + ((u8 *)freeSpace - (u8 *)arm11ExceptionsPage);
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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, 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(5));
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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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} |