73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* mainHandler.c
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* by TuxSH
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*
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* This is part of Luma3DS, see LICENSE.txt for details
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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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void __attribute__((noreturn)) mainHandler(u32 regs[REG_DUMP_SIZE / 4], 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 = 1;
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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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dumpHeader.stackDumpSize = 0x1000 - (registerDump[13] & 0xfff);
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dumpHeader.totalSize = sizeof(ExceptionDumpHeader) + dumpHeader.registerDumpSize + dumpHeader.codeDumpSize + dumpHeader.stackDumpSize;
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//Dump code
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vu8 *instr = (vu8 *)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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for(u32 i = 0; i < dumpHeader.codeDumpSize; i++)
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codeDump[i] = instr[i];
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//Copy header (actually optimized by the compiler), register dump and code dump
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vu32 *final = (vu32 *)FINAL_BUFFER;
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*(ExceptionDumpHeader *)final = dumpHeader;
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final += sizeof(ExceptionDumpHeader) / 4;
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for(u32 i = 0; i < dumpHeader.registerDumpSize / 4; i++)
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*final++ = registerDump[i];
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for(u32 i = 0; i < dumpHeader.codeDumpSize / 4; i++)
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*final++ = *((u32 *)codeDump + i);
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//Dump stack in place
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vu32 *sp = (vu32 *)registerDump[13];
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for(u32 i = 0; i < dumpHeader.stackDumpSize / 4; i++)
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*final++ = sp[i];
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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(1);
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} |