199 lines
7.5 KiB
C
199 lines
7.5 KiB
C
/*
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* exceptions.c
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* by TuxSH
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*/
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#include "exceptions.h"
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#include "fs.h"
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#include "memory.h"
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#include "screeninit.h"
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#include "draw.h"
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#include "i2c.h"
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#include "utils.h"
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#include "../build/arm9_exceptions.h"
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#include "../build/arm11_exceptions.h"
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typedef struct __attribute__((packed))
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{
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u32 magic[2];
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u16 versionMinor, versionMajor;
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u16 processor, core;
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u32 type;
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u32 totalSize;
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u32 registerDumpSize;
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u32 codeDumpSize;
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u32 stackDumpSize;
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u32 additionalDataSize;
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} ExceptionDumpHeader;
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void installArm9Handlers(void)
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{
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void *payloadAddress = (void *)0x01FF8000;
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const u32 offsets[] = {0x08, 0x18, 0x20, 0x28};
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memcpy(payloadAddress, arm9_exceptions + 32, arm9_exceptions_size - 32);
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//IRQHandler is at 0x08000000, but we won't handle it for some reasons
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//svcHandler is at 0x08000010, but we won't handle svc either
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for(u32 i = 0; i < 4; i++)
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{
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*(vu32 *)(0x08000000 + offsets[i]) = 0xE51FF004;
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*(vu32 *)(0x08000000 + offsets[i] + 4) = *((const u32 *)arm9_exceptions + 1 + i);
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}
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}
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#define MAKE_BRANCH(src,dst) (0xEA000000 | ((u32)((((u8 *)(dst) - (u8 *)(src)) >> 2) - 2) & 0xFFFFFF))
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#define MAKE_BRANCH_LINK(src,dst) (0xEB000000 | ((u32)((((u8 *)(dst) - (u8 *)(src)) >> 2) - 2) & 0xFFFFFF))
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void installArm11Handlers(u32 *exceptionsPage, u32 stackAddr, u32 codeSetOffset)
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{
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u32 *initFPU;
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for(initFPU = exceptionsPage; initFPU < (exceptionsPage + 0x400) && (initFPU[0] != 0xE59F0008 || initFPU[1] != 0xE5900000); initFPU += 1);
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u32 *mcuReboot;
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for(mcuReboot = exceptionsPage; mcuReboot < (exceptionsPage + 0x400) && (mcuReboot[0] != 0xE59F4104 || mcuReboot[1] != 0xE3A0A0C2); mcuReboot += 1);
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mcuReboot--;
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u32 *freeSpace;
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for(freeSpace = initFPU; freeSpace < (exceptionsPage + 0x400) && (freeSpace[0] != 0xFFFFFFFF || freeSpace[1] != 0xFFFFFFFF); freeSpace += 1);
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memcpy(freeSpace, arm11_exceptions + 32, arm11_exceptions_size - 32);
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exceptionsPage[1] = MAKE_BRANCH(exceptionsPage + 1, (u8 *)freeSpace + *(u32 *)(arm11_exceptions + 8) - 32); //Undefined Instruction
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exceptionsPage[3] = MAKE_BRANCH(exceptionsPage + 3, (u8 *)freeSpace + *(u32 *)(arm11_exceptions + 12) - 32); //Prefetch Abort
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exceptionsPage[4] = MAKE_BRANCH(exceptionsPage + 4, (u8 *)freeSpace + *(u32 *)(arm11_exceptions + 16) - 32); //Data Abort
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exceptionsPage[7] = MAKE_BRANCH(exceptionsPage + 7, (u8 *)freeSpace + *(u32 *)(arm11_exceptions + 4) - 32); //FIQ
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for(u32 *pos = freeSpace; pos < (u32 *)((u8 *)freeSpace + arm11_exceptions_size - 32); pos++)
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{
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switch(*pos) //Perform relocations
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{
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case 0xFFFF3000: *pos = stackAddr; break;
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case 0xEBFFFFFE: *pos = MAKE_BRANCH_LINK(pos, initFPU); break;
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case 0xEAFFFFFE: *pos = MAKE_BRANCH(pos, mcuReboot); break;
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case 0xE12FFF1C: pos[1] = 0xFFFF0000 + 4 * (u32)(freeSpace - exceptionsPage) + pos[1] - 32; break; // bx r12 (mainHandler)
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case 0xBEEFBEEF: *pos = codeSetOffset;
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default: break;
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}
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}
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}
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static void hexItoa(u32 n, char *out)
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{
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const char hexDigits[] = "0123456789ABCDEF";
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u32 i = 0;
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while(n > 0)
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{
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out[7 - i++] = hexDigits[n & 0xF];
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n >>= 4;
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}
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for(; i < 8; i++) out[7 - i] = '0';
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}
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void detectAndProcessExceptionDumps(void)
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{
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const char *handledExceptionNames[] = {
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"FIQ", "undefined instruction", "prefetch abort", "data abort"
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};
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const char *registerNames[] = {
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"R0", "R1", "R2", "R3", "R4", "R5", "R6", "R7", "R8", "R9", "R10", "R11", "R12",
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"SP", "LR", "PC", "CPSR", "FPEXC"
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};
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char hexstring[] = "00000000";
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volatile ExceptionDumpHeader *dumpHeader = (volatile ExceptionDumpHeader *)0x25000000;
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vu32 *dump = (vu32 *)dumpHeader;
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vu32 *regs = (vu32 *)((vu8 *)dumpHeader + sizeof(ExceptionDumpHeader));
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vu8 *additionalData = (vu8 *)dumpHeader + dumpHeader->totalSize - dumpHeader->additionalDataSize;
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if(dumpHeader->magic[0] == 0xDEADC0DE && dumpHeader->magic[1] == 0xDEADCAFE && (dumpHeader->processor == 9 || dumpHeader->processor == 11))
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{
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char path9[41] = "/luma/dumps/arm9";
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char path11[42] = "/luma/dumps/arm11";
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char fileName[] = "crash_dump_00000000.dmp";
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u32 size = dumpHeader->totalSize;
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if(dumpHeader->processor == 9)
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{
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findDumpFile(path9, fileName);
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path9[16] = '/';
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memcpy(&path9[17], fileName, sizeof(fileName));
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fileWrite((void *)dump, path9, size);
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}
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else
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{
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findDumpFile(path11, fileName);
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path11[17] = '/';
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memcpy(&path11[18], fileName, sizeof(fileName));
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fileWrite((void *)dump, path11, dump[5]);
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}
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char arm11Str[] = "Processor: ARM11 (core X)";
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if(dumpHeader->processor == 11) arm11Str[29] = '0' + (char)(dumpHeader->core);
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initScreens();
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drawString("An exception occurred", 10, 10, COLOR_RED);
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int posY = drawString((dumpHeader->processor == 11) ? arm11Str : "Processor: ARM9", 10, 30, COLOR_WHITE) + SPACING_Y;
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posY = drawString("Exception type: ", 10, posY, COLOR_WHITE);
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posY = drawString(handledExceptionNames[dumpHeader->type], 10 + 17 * SPACING_X, posY, COLOR_WHITE);
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if(dumpHeader->type == 2 && dumpHeader->registerDumpSize >= 4 && (regs[16] & 0x20) == 0
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&& *(vu32 *)((vu8 *)dumpHeader + sizeof(ExceptionDumpHeader) + dumpHeader->registerDumpSize + dumpHeader->codeDumpSize - 4) == 0xE12FFF7F)
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posY = drawString("(svcBreak)", 10 + 32 * SPACING_X, posY, COLOR_WHITE);
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if(dumpHeader->processor == 11 && dumpHeader->additionalDataSize != 0)
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{
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posY += SPACING_Y;
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char processNameStr[] = "Current process: --------";
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memcpy(processNameStr + 17, (char *)additionalData, 8);
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posY = drawString(processNameStr, 10, posY, COLOR_WHITE);
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}
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posY += 3 * SPACING_Y;
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for(u32 i = 0; i < 17; i += 2)
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{
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posY = drawString(registerNames[i], 10, posY, COLOR_WHITE);
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hexItoa(regs[i], hexstring);
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posY = drawString(hexstring, 10 + 7 * SPACING_X, posY, COLOR_WHITE);
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if(dumpHeader->processor != 9 || i != 16)
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{
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posY = drawString(registerNames[i + 1], 10 + 22 * SPACING_X, posY, COLOR_WHITE);
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hexItoa((i == 16) ? regs[20] : regs[i + 1], hexstring);
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posY = drawString(hexstring, 10 + 29 * SPACING_X, posY, COLOR_WHITE);
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}
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posY += SPACING_Y;
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}
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posY += 2 * SPACING_Y;
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u32 mode = regs[16] & 0xF;
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if(dumpHeader->type == 3 && (mode == 7 || mode == 11))
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{
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posY = drawString("Incorrect dump: failed to dump code and/or stack", 10, posY, 0x00FFFF) + 2 * SPACING_Y; //in yellow
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if(dumpHeader->processor != 9) posY -= SPACING_Y;
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}
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posY = drawString("You can find a dump in the following file:", 10, posY, COLOR_WHITE) + SPACING_Y;
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posY = drawString((dumpHeader->processor == 9) ? path9 : path11, 10, posY, COLOR_WHITE) + 2 * SPACING_Y;
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drawString("Press any button to shutdown", 10, posY, COLOR_WHITE);
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waitInput();
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for(u32 i = 0; i < size / 4; i++) dump[i] = 0;
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clearScreens();
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i2cWriteRegister(I2C_DEV_MCU, 0x20, 1); //Shutdown
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while(1);
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}
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} |