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/* $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);
}
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