// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modified by Cort Dougan (cort@cs.nmt.edu) * and Paul Mackerras (paulus@cs.anu.edu.au) * * (C) Copyright 2000 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. */ /* * This file handles the architecture-dependent parts of hardware exceptions */ #include <common.h> #include <command.h> #include <kgdb.h> #include <asm/processor.h> DECLARE_GLOBAL_DATA_PTR; /* Returns 0 if exception not found and fixup otherwise. */ extern unsigned long search_exception_table(unsigned long); /* * End of addressable memory. This may be less than the actual * amount of memory on the system if we're unable to keep all * the memory mapped in. */ #define END_OF_MEM (gd->bd->bi_memstart + get_effective_memsize()) /* * Trap & Exception support */ static void print_backtrace(unsigned long *sp) { int cnt = 0; unsigned long i; printf("Call backtrace: "); while (sp) { if ((uint) sp > END_OF_MEM) break; i = sp[1]; if (cnt++ % 7 == 0) printf("\n"); printf("%08lX ", i); if (cnt > 32) break; sp = (unsigned long *)*sp; } printf("\n"); } void show_regs(struct pt_regs *regs) { int i; printf("NIP: %08lX XER: %08lX LR: %08lX REGS:" " %p TRAP: %04lx DAR: %08lX\n", regs->nip, regs->xer, regs->link, regs, regs->trap, regs->dar); printf("MSR: %08lx EE: %01x PR: %01x FP:" " %01x ME: %01x IR/DR: %01x%01x\n", regs->msr, regs->msr & MSR_EE ? 1 : 0, regs->msr & MSR_PR ? 1 : 0, regs->msr & MSR_FP ? 1 : 0, regs->msr & MSR_ME ? 1 : 0, regs->msr & MSR_IR ? 1 : 0, regs->msr & MSR_DR ? 1 : 0); printf("\n"); for (i = 0; i < 32; i++) { if ((i % 8) == 0) { printf("GPR%02d: ", i); } printf("%08lX ", regs->gpr[i]); if ((i % 8) == 7) { printf("\n"); } } } static void _exception(int signr, struct pt_regs *regs) { show_regs(regs); print_backtrace((unsigned long *)regs->gpr[1]); panic("Exception in kernel pc %lx signal %d", regs->nip, signr); } void MachineCheckException(struct pt_regs *regs) { unsigned long fixup; /* Probing PCI using config cycles cause this exception * when a device is not present. Catch it and return to * the PCI exception handler. */ if ((fixup = search_exception_table(regs->nip)) != 0) { regs->nip = fixup; return; } #if defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler) (regs)) return; #endif printf("Machine check in kernel mode.\n"); printf("Caused by (from msr): "); printf("regs %p ", regs); switch ( regs->msr & 0x001F0000) { case (0x80000000>>11): printf("MSS error. MSSSR0: %08x\n", mfspr(SPRN_MSSSR0)); break; case (0x80000000>>12): printf("Machine check signal - probably due to mm fault\n" "with mmu off\n"); break; case (0x80000000 >> 13): printf("Transfer error ack signal\n"); break; case (0x80000000 >> 14): printf("Data parity signal\n"); break; case (0x80000000 >> 15): printf("Address parity signal\n"); break; default: printf("Unknown values in msr\n"); } show_regs(regs); print_backtrace((unsigned long *)regs->gpr[1]); panic("machine check"); } void AlignmentException(struct pt_regs *regs) { #if defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler) (regs)) return; #endif show_regs(regs); print_backtrace((unsigned long *)regs->gpr[1]); panic("Alignment Exception"); } void ProgramCheckException(struct pt_regs *regs) { unsigned char *p = regs ? (unsigned char *)(regs->nip) : NULL; int i, j; #if defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler) (regs)) return; #endif show_regs(regs); p = (unsigned char *)((unsigned long)p & 0xFFFFFFE0); p -= 32; for (i = 0; i < 256; i += 16) { printf("%08x: ", (unsigned int)p + i); for (j = 0; j < 16; j++) { printf("%02x ", p[i + j]); } printf("\n"); } print_backtrace((unsigned long *)regs->gpr[1]); panic("Program Check Exception"); } void SoftEmuException(struct pt_regs *regs) { #if defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler) (regs)) return; #endif show_regs(regs); print_backtrace((unsigned long *)regs->gpr[1]); panic("Software Emulation Exception"); } void UnknownException(struct pt_regs *regs) { #if defined(CONFIG_CMD_KGDB) if (debugger_exception_handler && (*debugger_exception_handler) (regs)) return; #endif printf("UnknownException regs@%lx\n", (ulong)regs); printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", regs->nip, regs->msr, regs->trap); _exception(0, regs); }