71 lines
2.7 KiB
C
71 lines
2.7 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 "types.h"
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#include "handlers.h"
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#define FINAL_BUFFER 0xE5000000 //0x25000000
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#define REG_DUMP_SIZE (4*18)
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#define CODE_DUMP_SIZE 48
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#define OTHER_DATA_SIZE 0
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void __attribute__((noreturn)) mainHandler(u32 regs[18], u32 type, u32 cpuId, u32 fpexc)
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{
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u32 dump[(40 + REG_DUMP_SIZE + CODE_DUMP_SIZE) / 4];
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vu32 *final = (vu32 *)FINAL_BUFFER;
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while(final[0] == 0xDEADC0DE && final[1] == 0xDEADCAFE && ((final[3] & 0xFFFF) == 9 || (final[3] & 0xFFFF) == 11));
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dump[0] = 0xDEADC0DE; //Magic
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dump[1] = 0xDEADCAFE; //Magic
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dump[2] = (1 << 16) | 0; //Dump format version number
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dump[3] = ((cpuId & 0xf) << 16) | 11; //Processor
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dump[4] = type; //Exception type
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dump[6] = REG_DUMP_SIZE; //Register dump size (r0-r12, sp, lr, pc, cpsr, fpexc)
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dump[7] = CODE_DUMP_SIZE; //Code dump size (10 ARM instructions, up to 20 Thumb instructions).
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dump[9] = OTHER_DATA_SIZE; //Other data size
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//Dump registers
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//Current order of saved regs: cpsr, pc, r8-r12, sp, lr, r0-r7
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u32 *regdump = dump + 10;
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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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regdump[15] = pc;
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regdump[16] = cpsr;
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regdump[17] = fpexc;
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for(u32 i = 0; i < 7; i++)
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regdump[8 + i] = regs[2 + i];
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for(u32 i = 0; i < 8; i++)
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regdump[i] = regs[9 + i];
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dump[8] = 0x1000 - (regdump[13] & 0xfff); //Stack dump size (max. 0x1000 bytes)
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dump[5] = 40 + REG_DUMP_SIZE + CODE_DUMP_SIZE + dump[8] + OTHER_DATA_SIZE; //Total size
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//Dump code
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u16 *codedump = (u16 *)(regdump + dump[6] / 4);
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vu16 *instr = (vu16 *)pc - dump[7] / 2 + 1;
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for(u32 i = 0; i < dump[7] / 2; i++)
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codedump[i] = instr[i];
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//Dump stack in place
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vu32 *sp = (vu32 *)regdump[13];
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vu32 *stackdump = (vu32 *)((vu8 *)FINAL_BUFFER + 40 + REG_DUMP_SIZE + CODE_DUMP_SIZE);
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for(u32 i = 0; i < dump[8] / 4; i++)
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stackdump[i] = sp[i];
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for(u32 i = 0; i < (40 + REG_DUMP_SIZE + CODE_DUMP_SIZE) / 4; i++)
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final[i] = dump[i];
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clearDCacheAndDMB();
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mcuReboot();
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}
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