126 lines
4.5 KiB
C
126 lines
4.5 KiB
C
/*
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* This file is part of Luma3DS
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* Copyright (C) 2016-2017 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 and 7.c of GPLv3 apply to this file:
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* * Requiring preservation of specified reasonable legal notices or
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* author attributions in that material or in the Appropriate Legal
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* Notices displayed by works containing it.
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* * Prohibiting misrepresentation of the origin of that material,
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* or requiring that modified versions of such material be marked in
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* reasonable ways as different from the original version.
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*/
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#include "i2c.h"
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#include "handlers.h"
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#define FINAL_BUFFER 0x25000000
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#define REG_DUMP_SIZE 4 * 17
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#define CODE_DUMP_SIZE 48
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bool cannotAccessAddress(const void *address)
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{
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u32 regionSettings[8];
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u32 addr = (u32)address;
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u32 dataAccessPermissions = readMPUConfig(regionSettings);
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for(u32 i = 0; i < 8; i++)
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{
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if((dataAccessPermissions & 0xF) == 0 || (regionSettings[i] & 1) == 0)
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continue; //No access / region not enabled
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u32 regionAddrBase = regionSettings[i] & ~0xFFF;
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u32 regionSize = 1 << (((regionSettings[i] >> 1) & 0x1F) + 1);
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if(addr >= regionAddrBase && addr < regionAddrBase + regionSize)
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return false;
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dataAccessPermissions >>= 4;
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}
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return true;
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}
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static u32 __attribute__((noinline)) copyMemory(void *dst, const void *src, u32 size, u32 alignment)
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{
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u8 *out = (u8 *)dst;
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const u8 *in = (const u8 *)src;
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if(((u32)src & (alignment - 1)) != 0 || cannotAccessAddress(src) || (size != 0 && cannotAccessAddress((u8 *)src + size - 1)))
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return 0;
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for(u32 i = 0; i < size; i++)
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*out++ = *in++;
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return size;
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}
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void __attribute__((noreturn)) mainHandler(u32 *regs, u32 type)
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{
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ExceptionDumpHeader dumpHeader;
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u32 registerDump[REG_DUMP_SIZE / 4];
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u8 codeDump[CODE_DUMP_SIZE];
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dumpHeader.magic[0] = 0xDEADC0DE;
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dumpHeader.magic[1] = 0xDEADCAFE;
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dumpHeader.versionMajor = 1;
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dumpHeader.versionMinor = 2;
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dumpHeader.processor = 9;
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dumpHeader.core = 0;
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dumpHeader.type = type;
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dumpHeader.registerDumpSize = REG_DUMP_SIZE;
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dumpHeader.codeDumpSize = CODE_DUMP_SIZE;
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dumpHeader.additionalDataSize = 0;
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//Dump registers
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//Current order of saved regs: cpsr, pc, r8-r14, r0-r7
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u32 cpsr = regs[0];
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u32 pc = regs[1] - (type < 3 ? (((cpsr & 0x20) != 0 && type == 1) ? 2 : 4) : 8);
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registerDump[15] = pc;
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registerDump[16] = cpsr;
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for(u32 i = 0; i < 7; i++) registerDump[8 + i] = regs[2 + i];
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for(u32 i = 0; i < 8; i++) registerDump[i] = regs[9 + i];
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//Dump code
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u8 *instr = (u8 *)pc + ((cpsr & 0x20) ? 2 : 4) - dumpHeader.codeDumpSize; //Doesn't work well on 32-bit Thumb instructions, but it isn't much of a problem
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dumpHeader.codeDumpSize = copyMemory(codeDump, instr, dumpHeader.codeDumpSize, ((cpsr & 0x20) != 0) ? 2 : 4);
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//Copy register dump and code dump
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u8 *final = (u8 *)(FINAL_BUFFER + sizeof(ExceptionDumpHeader));
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final += copyMemory(final, registerDump, dumpHeader.registerDumpSize, 1);
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final += copyMemory(final, codeDump, dumpHeader.codeDumpSize, 1);
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//Dump stack in place
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dumpHeader.stackDumpSize = copyMemory(final, (const void *)registerDump[13], 0x1000 - (registerDump[13] & 0xFFF), 1);
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dumpHeader.totalSize = sizeof(ExceptionDumpHeader) + dumpHeader.registerDumpSize + dumpHeader.codeDumpSize + dumpHeader.stackDumpSize + dumpHeader.additionalDataSize;
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//Copy header (actually optimized by the compiler)
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*(ExceptionDumpHeader *)FINAL_BUFFER = dumpHeader;
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if(ARESCREENSINITIALIZED) i2cWriteRegister(I2C_DEV_MCU, 0x22, 1 << 0); //Shutdown LCD
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((void (*)())0xFFFF0830)(); //Ensure that all memory transfers have completed and that the data cache has been flushed
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i2cWriteRegister(I2C_DEV_MCU, 0x20, 1 << 2); //Reboot
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while(true);
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}
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