diff options
Diffstat (limited to 'arch/cris/arch-v32/kernel/traps.c')
| -rw-r--r-- | arch/cris/arch-v32/kernel/traps.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/cris/arch-v32/kernel/traps.c b/arch/cris/arch-v32/kernel/traps.c new file mode 100644 index 000000000000..6e3787045560 --- /dev/null +++ b/arch/cris/arch-v32/kernel/traps.c @@ -0,0 +1,160 @@ +/* + * Copyright (C) 2003, Axis Communications AB. + */ + +#include <linux/config.h> +#include <linux/ptrace.h> +#include <asm/uaccess.h> + +#include <asm/arch/hwregs/supp_reg.h> + +extern void reset_watchdog(void); +extern void stop_watchdog(void); + +extern int raw_printk(const char *fmt, ...); + +void +show_registers(struct pt_regs *regs) +{ + /* + * It's possible to use either the USP register or current->thread.usp. + * USP might not correspond to the current proccess for all cases this + * function is called, and current->thread.usp isn't up to date for the + * current proccess. Experience shows that using USP is the way to go. + */ + unsigned long usp; + unsigned long d_mmu_cause; + unsigned long i_mmu_cause; + + usp = rdusp(); + + raw_printk("CPU: %d\n", smp_processor_id()); + + raw_printk("ERP: %08lx SRP: %08lx CCS: %08lx USP: %08lx MOF: %08lx\n", + regs->erp, regs->srp, regs->ccs, usp, regs->mof); + + raw_printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", + regs->r0, regs->r1, regs->r2, regs->r3); + + raw_printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", + regs->r4, regs->r5, regs->r6, regs->r7); + + raw_printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", + regs->r8, regs->r9, regs->r10, regs->r11); + + raw_printk("r12: %08lx r13: %08lx oR10: %08lx acr: %08lx\n", + regs->r12, regs->r13, regs->orig_r10, regs->acr); + + raw_printk("sp: %08lx\n", regs); + + SUPP_BANK_SEL(BANK_IM); + SUPP_REG_RD(RW_MM_CAUSE, i_mmu_cause); + + SUPP_BANK_SEL(BANK_DM); + SUPP_REG_RD(RW_MM_CAUSE, d_mmu_cause); + + raw_printk(" Data MMU Cause: %08lx\n", d_mmu_cause); + raw_printk("Instruction MMU Cause: %08lx\n", i_mmu_cause); + + raw_printk("Process %s (pid: %d, stackpage: %08lx)\n", + current->comm, current->pid, (unsigned long) current); + + /* Show additional info if in kernel-mode. */ + if (!user_mode(regs)) { + int i; + unsigned char c; + + show_stack(NULL, (unsigned long *) usp); + + /* + * If the previous stack-dump wasn't a kernel one, dump the + * kernel stack now. + */ + if (usp != 0) + show_stack(NULL, NULL); + + raw_printk("\nCode: "); + + if (regs->erp < PAGE_OFFSET) + goto bad_value; + + /* + * Quite often the value at regs->erp doesn't point to the + * interesting instruction, which often is the previous + * instruction. So dump at an offset large enough that the + * instruction decoding should be in sync at the interesting + * point, but small enough to fit on a row. The regs->erp + * location is pointed out in a ksymoops-friendly way by + * wrapping the byte for that address in parenthesis. + */ + for (i = -12; i < 12; i++) { + if (__get_user(c, &((unsigned char *) regs->erp)[i])) { +bad_value: + raw_printk(" Bad IP value."); + break; + } + + if (i == 0) + raw_printk("(%02x) ", c); + else + raw_printk("%02x ", c); + } + + raw_printk("\n"); + } +} + +/* + * This gets called from entry.S when the watchdog has bitten. Show something + * similiar to an Oops dump, and if the kernel if configured to be a nice doggy; + * halt instead of reboot. + */ +void +watchdog_bite_hook(struct pt_regs *regs) +{ +#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + local_irq_disable(); + stop_watchdog(); + show_registers(regs); + + while (1) + ; /* Do nothing. */ +#else + show_registers(regs); +#endif +} + +/* This is normally the Oops function. */ +void +die_if_kernel(const char *str, struct pt_regs *regs, long err) +{ + if (user_mode(regs)) + return; + +#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + /* + * This printout might take too long and could trigger + * the watchdog normally. If NICE_DOGGY is set, simply + * stop the watchdog during the printout. + */ + stop_watchdog(); +#endif + + raw_printk("%s: %04lx\n", str, err & 0xffff); + + show_registers(regs); + +#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + reset_watchdog(); +#endif + + do_exit(SIGSEGV); +} + +void arch_enable_nmi(void) +{ + unsigned long flags; + local_save_flags(flags); + flags |= (1<<30); /* NMI M flag is at bit 30 */ + local_irq_restore(flags); +} |