| // SPDX-License-Identifier: GPL-2.0+ |
| /* |
| * linux/arch/powerpc/kernel/traps.c |
| * |
| * Copyright 2007 Freescale Semiconductor. |
| * Copyright (C) 2003 Motorola |
| * Modified by Xianghua Xiao(x.xiao@motorola.com) |
| * |
| * 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 <asm/global_data.h> |
| #include <asm/ptrace.h> |
| #include <command.h> |
| #include <init.h> |
| #include <irq_func.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->ram_base + get_effective_memsize()) |
| |
| static __inline__ void set_tsr(unsigned long val) |
| { |
| asm volatile("mtspr 0x150, %0" : : "r" (val)); |
| } |
| |
| static __inline__ unsigned long get_esr(void) |
| { |
| unsigned long val; |
| asm volatile("mfspr %0, 0x03e" : "=r" (val) :); |
| return val; |
| } |
| |
| #define ESR_MCI 0x80000000 |
| #define ESR_PIL 0x08000000 |
| #define ESR_PPR 0x04000000 |
| #define ESR_PTR 0x02000000 |
| #define ESR_DST 0x00800000 |
| #define ESR_DIZ 0x00400000 |
| #define ESR_U0F 0x00008000 |
| |
| /* |
| * 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 CritcalInputException(struct pt_regs *regs) |
| { |
| panic("Critical Input Exception"); |
| } |
| |
| int machinecheck_count = 0; |
| int machinecheck_error = 0; |
| void MachineCheckException(struct pt_regs *regs) |
| { |
| unsigned long fixup; |
| unsigned int mcsr, mcsrr0, mcsrr1, mcar; |
| |
| /* 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; |
| } |
| |
| mcsrr0 = mfspr(SPRN_MCSRR0); |
| mcsrr1 = mfspr(SPRN_MCSRR1); |
| mcsr = mfspr(SPRN_MCSR); |
| mcar = mfspr(SPRN_MCAR); |
| |
| machinecheck_count++; |
| machinecheck_error=1; |
| |
| #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 mcsr): "); |
| printf("mcsr = 0x%08x\n", mcsr); |
| if (mcsr & 0x80000000) |
| printf("Machine check input pin\n"); |
| if (mcsr & 0x40000000) |
| printf("Instruction cache parity error\n"); |
| if (mcsr & 0x20000000) |
| printf("Data cache push parity error\n"); |
| if (mcsr & 0x10000000) |
| printf("Data cache parity error\n"); |
| if (mcsr & 0x00000080) |
| printf("Bus instruction address error\n"); |
| if (mcsr & 0x00000040) |
| printf("Bus Read address error\n"); |
| if (mcsr & 0x00000020) |
| printf("Bus Write address error\n"); |
| if (mcsr & 0x00000010) |
| printf("Bus Instruction data bus error\n"); |
| if (mcsr & 0x00000008) |
| printf("Bus Read data bus error\n"); |
| if (mcsr & 0x00000004) |
| printf("Bus Write bus error\n"); |
| if (mcsr & 0x00000002) |
| printf("Bus Instruction parity error\n"); |
| if (mcsr & 0x00000001) |
| printf("Bus Read parity error\n"); |
| |
| show_regs(regs); |
| printf("MCSR=0x%08x \tMCSRR0=0x%08x \nMCSRR1=0x%08x \tMCAR=0x%08x\n", |
| mcsr, mcsrr0, mcsrr1, mcar); |
| print_backtrace((unsigned long *)regs->gpr[1]); |
| if (machinecheck_count > 10) { |
| panic("machine check count too high\n"); |
| } |
| |
| if (machinecheck_count > 1) { |
| regs->nip += 4; /* skip offending instruction */ |
| printf("Skipping current instr, Returning to 0x%08lx\n", |
| regs->nip); |
| } else { |
| printf("Returning back to 0x%08lx\n",regs->nip); |
| } |
| } |
| |
| 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) |
| { |
| long esr_val; |
| |
| #if defined(CONFIG_CMD_KGDB) |
| if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
| return; |
| #endif |
| |
| show_regs(regs); |
| |
| esr_val = get_esr(); |
| if( esr_val & ESR_PIL ) |
| printf( "** Illegal Instruction **\n" ); |
| else if( esr_val & ESR_PPR ) |
| printf( "** Privileged Instruction **\n" ); |
| else if( esr_val & ESR_PTR ) |
| printf( "** Trap Instruction **\n" ); |
| |
| print_backtrace((unsigned long *)regs->gpr[1]); |
| panic("Program Check Exception"); |
| } |
| |
| void PITException(struct pt_regs *regs) |
| { |
| /* |
| * Reset PIT interrupt |
| */ |
| set_tsr(0x0c000000); |
| |
| /* |
| * Call timer_interrupt routine in interrupts.c |
| */ |
| timer_interrupt(NULL); |
| } |
| |
| void UnknownException(struct pt_regs *regs) |
| { |
| #if defined(CONFIG_CMD_KGDB) |
| if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
| return; |
| #endif |
| |
| printf("Bad trap at PC: %lx, SR: %lx, vector=%lx\n", |
| regs->nip, regs->msr, regs->trap); |
| _exception(0, regs); |
| } |
| |
| void ExtIntException(struct pt_regs *regs) |
| { |
| volatile ccsr_pic_t *pic = (void *)(CFG_SYS_MPC8xxx_PIC_ADDR); |
| |
| uint vect; |
| |
| #if defined(CONFIG_CMD_KGDB) |
| if (debugger_exception_handler && (*debugger_exception_handler)(regs)) |
| return; |
| #endif |
| |
| printf("External Interrupt Exception at PC: %lx, SR: %lx, vector=%lx", |
| regs->nip, regs->msr, regs->trap); |
| vect = pic->iack0; |
| printf(" irq IACK0@%05x=%d\n",(int)&pic->iack0,vect); |
| show_regs(regs); |
| print_backtrace((unsigned long *)regs->gpr[1]); |
| } |
| |
| void DebugException(struct pt_regs *regs) |
| { |
| printf("Debugger trap at @ %lx\n", regs->nip ); |
| show_regs(regs); |
| } |