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