113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
/*
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* This file is part of Luma3DS
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* Copyright (C) 2016-2020 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 "arm9_exception_handlers.h"
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#include "i2c.h"
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#include "screen.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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static inline void dumpArm9Memory(ExceptionDumpHeader *dumpHeader, u8 *buf)
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{
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// Check if n3ds extra arm9 mem is enabled (if it's possible to read CFG9_EXTMEMCNT9)
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u8 extmemcnt9 = 0;
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safecpy(&extmemcnt9, (const void *)0x10000200, 1);
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u32 size = (extmemcnt9 & 1) ? 0x180000 : 0x100000;
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dumpHeader->additionalDataSize += safecpy(buf, (const void *)0x08000000, size);
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}
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void __attribute__((noreturn)) arm9ExceptionHandlerMain(u32 *registerDump, u32 type)
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{
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ExceptionDumpHeader dumpHeader;
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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 = 3;
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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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u32 cpsr = registerDump[16];
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u32 pc = registerDump[15] - (type < 3 ? (((cpsr & 0x20) != 0 && type == 1) ? 2 : 4) : 8);
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registerDump[15] = pc;
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//Dump code
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u8 *instr = (u8 *)pc + ((cpsr & 0x20) ? 2 : 4) - dumpHeader.codeDumpSize; //wouldn't work well on 32-bit Thumb instructions, but it isn't much of a problem
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dumpHeader.codeDumpSize = ((u32)instr & (((cpsr & 0x20) != 0) ? 1 : 3)) != 0 ? 0 : safecpy(codeDump, instr, dumpHeader.codeDumpSize);
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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 += safecpy(final, registerDump, dumpHeader.registerDumpSize);
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final += safecpy(final, codeDump, dumpHeader.codeDumpSize);
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//Dump stack in place
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dumpHeader.stackDumpSize = safecpy(final, (const void *)registerDump[13], 0x1000 - (registerDump[13] & 0xFFF));
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final += dumpHeader.stackDumpSize;
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// See if we need to copy Arm9 memory (check for bkpt 0xFFFD / bkpt 0xFD)
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if(dumpHeader.codeDumpSize > 0)
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{
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if(cpsr & 0x20)
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{
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// Thumb
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u16 instr;
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safecpy(&instr, codeDump + dumpHeader.codeDumpSize - 2, 2);
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if(instr == 0xBEFD) dumpArm9Memory(&dumpHeader, final);
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}
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else
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{
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u32 instr;
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safecpy(&instr, codeDump + dumpHeader.codeDumpSize - 4, 4);
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if(instr == 0xE12FFF7D) dumpArm9Memory(&dumpHeader, final);
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}
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}
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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) I2C_writeReg(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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I2C_writeReg(I2C_DEV_MCU, 0x20, 1 << 2); //Reboot
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while(true);
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}
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