diff options
Diffstat (limited to 'arch/cris/arch-v10/kernel/traps.c')
| -rw-r--r-- | arch/cris/arch-v10/kernel/traps.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/arch/cris/arch-v10/kernel/traps.c b/arch/cris/arch-v10/kernel/traps.c new file mode 100644 index 00000000000..da491f438a6 --- /dev/null +++ b/arch/cris/arch-v10/kernel/traps.c @@ -0,0 +1,132 @@ +/* $Id: traps.c,v 1.2 2003/07/04 08:27:41 starvik Exp $ + * + * linux/arch/cris/arch-v10/traps.c + * + * Heler functions for trap handlers + * + * Copyright (C) 2000-2002 Axis Communications AB + * + * Authors: Bjorn Wesen + * Hans-Peter Nilsson + * + */ + +#include <linux/config.h> +#include <linux/ptrace.h> +#include <asm/uaccess.h> +#include <asm/arch/sv_addr_ag.h> + +void +show_registers(struct pt_regs * regs) +{ + /* We either use rdusp() - the USP register, which might not + correspond to the current process for all cases we're called, + or we use the current->thread.usp, which is not up to date for + the current process. Experience shows we want the USP + register. */ + unsigned long usp = rdusp(); + + printk("IRP: %08lx SRP: %08lx DCCR: %08lx USP: %08lx MOF: %08lx\n", + regs->irp, regs->srp, regs->dccr, usp, regs->mof ); + printk(" r0: %08lx r1: %08lx r2: %08lx r3: %08lx\n", + regs->r0, regs->r1, regs->r2, regs->r3); + printk(" r4: %08lx r5: %08lx r6: %08lx r7: %08lx\n", + regs->r4, regs->r5, regs->r6, regs->r7); + printk(" r8: %08lx r9: %08lx r10: %08lx r11: %08lx\n", + regs->r8, regs->r9, regs->r10, regs->r11); + printk("r12: %08lx r13: %08lx oR10: %08lx\n", + regs->r12, regs->r13, regs->orig_r10); + printk("R_MMU_CAUSE: %08lx\n", (unsigned long)*R_MMU_CAUSE); + printk("Process %s (pid: %d, stackpage=%08lx)\n", + current->comm, current->pid, (unsigned long)current); + + /* + * When in-kernel, we also print out the stack and code at the + * time of the fault.. + */ + if (! user_mode(regs)) { + int i; + + show_stack(NULL, (unsigned long*)usp); + + /* Dump kernel stack if the previous dump wasn't one. */ + if (usp != 0) + show_stack (NULL, NULL); + + printk("\nCode: "); + if(regs->irp < PAGE_OFFSET) + goto bad; + + /* Often enough the value at regs->irp does not point to + the interesting instruction, which is most often the + _previous_ instruction. So we dump at an offset large + enough that instruction decoding should be in sync at + the interesting point, but small enough to fit on a row + (sort of). We point out the regs->irp location in a + ksymoops-friendly way by wrapping the byte for that + address in parentheses. */ + for(i = -12; i < 12; i++) + { + unsigned char c; + if(__get_user(c, &((unsigned char*)regs->irp)[i])) { +bad: + printk(" Bad IP value."); + break; + } + + if (i == 0) + printk("(%02x) ", c); + else + printk("%02x ", c); + } + printk("\n"); + } +} + +/* Called from entry.S when the watchdog has bitten + * We print out something resembling an oops dump, and if + * we have the nice doggy development flag set, we halt here + * instead of rebooting. + */ + +extern void reset_watchdog(void); +extern void stop_watchdog(void); + + +void +watchdog_bite_hook(struct pt_regs *regs) +{ +#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + local_irq_disable(); + stop_watchdog(); + show_registers(regs); + while(1) /* nothing */; +#else + show_registers(regs); +#endif +} + +/* This is normally the 'Oops' routine */ +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 trigger the + * watchdog normally. If we're in the nice doggy + * development mode, stop the watchdog during printout. + */ + stop_watchdog(); +#endif + + printk("%s: %04lx\n", str, err & 0xffff); + + show_registers(regs); + +#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY + reset_watchdog(); +#endif + do_exit(SIGSEGV); +} |