84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
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/*
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* main.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 "i2c.h"
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#include "handlers.h"
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#define TEMP_BUFFER 0x1FF80000 //We choose AXIWRAM as tmp buffer since it's usually ARM11 payloads running there
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#define FINAL_BUFFER 0x25000000
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#define STACK_DUMP_SIZE 0x2000
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#define SP ((void *)(TEMP_BUFFER + 4 * STACK_DUMP_SIZE))
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void __attribute__((noreturn)) mainHandler(u32 regs[17], u32 type)
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{
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vu32 *dump = (u32 *)TEMP_BUFFER;
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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] = 9; //Processor
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dump[4] = type; //Exception type
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dump[6] = 4 * 17; //Register dump size (r0-r12, sp, lr, pc, cpsr)
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dump[7] = 40; //Code dump size (10 ARM instructions, up to 20 Thumb instructions).
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dump[8] = STACK_DUMP_SIZE; //Stack dump size
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dump[9] = 0; //Other data size
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dump[5] = 40 + dump[6] + dump[7] + dump[8] + dump[9]; //Total size
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//Dump registers
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//Current order of regs: pc, spsr, r8-r12, sp, lr, r0-r7
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vu32 *regdump = dump + 10;
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u32 cpsr = regs[1];
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u32 pc = regs[0] + (((cpsr & 0x20) != 0 && type == 1) ? 2 : 0);
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regdump[15] = pc;
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regdump[16] = cpsr;
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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 code
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vu16 *codedump = (vu16 *)(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
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vu32 *sp = (vu32 *)regdump[13];
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vu32 *stackdump = (vu32 *)(codedump + dump[7] / 2);
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/* Homebrew/CFW set their stack at 0x27000000, but we'd better not make any assumption here
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as it breaks things it seems */
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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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vu32 *final = (u32 *)FINAL_BUFFER;
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for(u32 i = 0; i < dump[5] / 4; i++)
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final[i] = dump[i];
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i2cWriteRegister(I2C_DEV_MCU, 0x20, 1 << 2); //Reboot
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while(1);
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}
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void main(void)
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{
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setupStack(1, SP); //FIQ
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setupStack(7, SP); //Abort
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setupStack(11, SP); //Undefined
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*(vu32 *)0x08000004 = 0xE51FF004;
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*(vu32 *)0x08000008 = (u32)FIQHandler;
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*(vu32 *)0x08000014 = 0xE51FF004;
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*(vu32 *)0x08000018 = (u32)undefinedInstructionHandler;
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*(vu32 *)0x0800001C = 0xE51FF004;
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*(vu32 *)0x08000020 = (u32)prefetchAbortHandler;
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*(vu32 *)0x08000028 = 0xE51FF004;
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*(vu32 *)0x0800002C = (u32)dataAbortHandler;
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}
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