-/* $Id: traps.c,v 1.9 2004/05/11 12:28:26 starvik Exp $
- *
+/*
* 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
+ * Here we handle the break vectors not used by the system call
+ * mechanism, as well as some general stack/register dumping
* things.
- *
- * Copyright (C) 2000-2002 Axis Communications AB
+ *
+ * Copyright (C) 2000-2007 Axis Communications AB
*
* Authors: Bjorn Wesen
- * Hans-Peter Nilsson
+ * 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 show_trace(unsigned long * stack)
+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: ");
+ printk("\nCall Trace: ");
- i = 1;
- module_start = VMALLOC_START;
- module_end = VMALLOC_END;
+ i = 1;
+ module_start = VMALLOC_START;
+ module_end = VMALLOC_END;
- while (((long) stack & (THREAD_SIZE-1)) != 0) {
- if (__get_user (addr, stack)) {
+ 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);
+ 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++;
- }
- }
+ /*
+ * 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++;
+ }
+ }
}
/*
* with the ksymoops maintainer.
*/
-void
+void
show_stack(struct task_struct *task, unsigned long *sp)
{
- unsigned long *stack, addr;
- int i;
+ unsigned long *stack, addr;
+ int i;
/*
* debugging aid: "show_stack(NULL);" prints a
* back trace.
*/
- if(sp == NULL) {
+ if (sp == NULL) {
if (task)
sp = (unsigned long*)task->thread.ksp;
else
sp = (unsigned long*)rdsp();
}
- stack = sp;
+ 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)) {
+ 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);
+ 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()
+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++)
+ for (i = 0; i < 16; i++)
printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
return 0;
}
#endif
-void dump_stack(void)
+void
+dump_stack(void)
{
show_stack(NULL, NULL);
}
-
EXPORT_SYMBOL(dump_stack);
-void __init
+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 */