/*
* 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);
}
