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/*
* linux/arch/cris/traps.c
*
* Here we handle the break vectors not used by the system call
* mechanism, as well as some general stack/register dumping
* things.
*
* Copyright (C) 2000-2007 Axis Communications AB
*
* Authors: Bjorn Wesen
* Hans-Peter Nilsson
*
*/
#include <linux/init.h>
#include <linux/module.h>
#include <asm/pgtable.h>
#include <asm/uaccess.h>
extern void arch_enable_nmi(void);
extern void stop_watchdog(void);
extern void reset_watchdog(void);
extern void show_registers(struct pt_regs *regs);
#ifdef CONFIG_DEBUG_BUGVERBOSE
extern void handle_BUG(struct pt_regs *regs);
#else
#define handle_BUG(regs)
#endif
static int kstack_depth_to_print = 24;
void (*nmi_handler)(struct pt_regs *);
void
show_trace(unsigned long *stack)
{
unsigned long addr, module_start, module_end;
extern char _stext, _etext;
int i;
printk("\nCall Trace: ");
i = 1;
module_start = VMALLOC_START;
module_end = VMALLOC_END;
while (((long)stack & (THREAD_SIZE-1)) != 0) {
if (__get_user(addr, stack)) {
/* This message matches "failing address" marked
s390 in ksymoops, so lines containing it will
not be filtered out by ksymoops. */
printk("Failing address 0x%lx\n", (unsigned long)stack);
break;
}
stack++;
/*
* If the address is either in the text segment of the
* kernel, or in the region which contains vmalloc'ed
* memory, it *may* be the address of a calling
* routine; if so, print it so that someone tracing
* down the cause of the crash will be able to figure
* out the call path that was taken.
*/
if (((addr >= (unsigned long)&_stext) &&
(addr <= (unsigned long)&_etext)) ||
((addr >= module_start) && (addr <= module_end))) {
if (i && ((i % 8) == 0))
printk("\n ");
printk("[<%08lx>] ", addr);
i++;
}
}
}
/*
* These constants are for searching for possible module text
* segments. MODULE_RANGE is a guess of how much space is likely
* to be vmalloced.
*/
#define MODULE_RANGE (8*1024*1024)
/*
* The output (format, strings and order) is adjusted to be usable with
* ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't
* change it unless you're serious about adjusting ksymoops and syncing
* with the ksymoops maintainer.
*/
void
show_stack(struct task_struct *task, unsigned long *sp)
{
unsigned long *stack, addr;
int i;
/*
* debugging aid: "show_stack(NULL);" prints a
* back trace.
*/
if (sp == NULL) {
if (task)
sp = (unsigned long*)task->thread.ksp;
else
sp = (unsigned long*)rdsp();
}
stack = sp;
printk("\nStack from %08lx:\n ", (unsigned long)stack);
for (i = 0; i < kstack_depth_to_print; i++) {
if (((long)stack & (THREAD_SIZE-1)) == 0)
break;
if (i && ((i % 8) == 0))
printk("\n ");
if (__get_user(addr, stack)) {
/* This message matches "failing address" marked
s390 in ksymoops, so lines containing it will
not be filtered out by ksymoops. */
printk("Failing address 0x%lx\n", (unsigned long)stack);
break;
}
stack++;
printk("%08lx ", addr);
}
show_trace(sp);
}
#if 0
/* displays a short stack trace */
int
show_stack(void)
{
unsigned long *sp = (unsigned long *)rdusp();
int i;
printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
for (i = 0; i < 16; i++)
printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
return 0;
}
#endif
void
dump_stack(void)
{
show_stack(NULL, NULL);
}
EXPORT_SYMBOL(dump_stack);
void
set_nmi_handler(void (*handler)(struct pt_regs *))
{
nmi_handler = handler;
arch_enable_nmi();
}
#ifdef CONFIG_DEBUG_NMI_OOPS
void
oops_nmi_handler(struct pt_regs *regs)
{
stop_watchdog();
oops_in_progress = 1;
printk("NMI!\n");
show_registers(regs);
oops_in_progress = 0;
}
static int __init
oops_nmi_register(void)
{
set_nmi_handler(oops_nmi_handler);
return 0;
}
__initcall(oops_nmi_register);
#endif
/*
* This gets called from entry.S when the watchdog has bitten. Show something
* similar to an Oops dump, and if the kernel is configured to be a nice
* doggy, then 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
handle_BUG(regs);
printk("%s: %04lx\n", str, err & 0xffff);
show_registers(regs);
oops_in_progress = 0;
#ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
reset_watchdog();
#endif
do_exit(SIGSEGV);
}
void __init
trap_init(void)
{
/* Nothing needs to be done */
}
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