2 * linux/arch/cris/traps.c
4 * Here we handle the break vectors not used by the system call
5 * mechanism, as well as some general stack/register dumping
8 * Copyright (C) 2000-2007 Axis Communications AB
10 * Authors: Bjorn Wesen
15 #include <linux/init.h>
16 #include <linux/module.h>
18 #include <asm/pgtable.h>
19 #include <asm/uaccess.h>
20 #include <arch/system.h>
22 extern void arch_enable_nmi(void);
23 extern void stop_watchdog(void);
24 extern void reset_watchdog(void);
25 extern void show_registers(struct pt_regs *regs);
27 #ifdef CONFIG_DEBUG_BUGVERBOSE
28 extern void handle_BUG(struct pt_regs *regs);
30 #define handle_BUG(regs)
33 static int kstack_depth_to_print = 24;
35 void (*nmi_handler)(struct pt_regs *);
38 show_trace(unsigned long *stack)
40 unsigned long addr, module_start, module_end;
41 extern char _stext, _etext;
44 printk("\nCall Trace: ");
47 module_start = VMALLOC_START;
48 module_end = VMALLOC_END;
50 while (((long)stack & (THREAD_SIZE-1)) != 0) {
51 if (__get_user(addr, stack)) {
52 /* This message matches "failing address" marked
53 s390 in ksymoops, so lines containing it will
54 not be filtered out by ksymoops. */
55 printk("Failing address 0x%lx\n", (unsigned long)stack);
61 * If the address is either in the text segment of the
62 * kernel, or in the region which contains vmalloc'ed
63 * memory, it *may* be the address of a calling
64 * routine; if so, print it so that someone tracing
65 * down the cause of the crash will be able to figure
66 * out the call path that was taken.
68 if (((addr >= (unsigned long)&_stext) &&
69 (addr <= (unsigned long)&_etext)) ||
70 ((addr >= module_start) && (addr <= module_end))) {
71 if (i && ((i % 8) == 0))
73 printk("[<%08lx>] ", addr);
80 * These constants are for searching for possible module text
81 * segments. MODULE_RANGE is a guess of how much space is likely
85 #define MODULE_RANGE (8*1024*1024)
88 * The output (format, strings and order) is adjusted to be usable with
89 * ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't
90 * change it unless you're serious about adjusting ksymoops and syncing
91 * with the ksymoops maintainer.
95 show_stack(struct task_struct *task, unsigned long *sp)
97 unsigned long *stack, addr;
101 * debugging aid: "show_stack(NULL);" prints a
107 sp = (unsigned long*)task->thread.ksp;
109 sp = (unsigned long*)rdsp();
114 printk("\nStack from %08lx:\n ", (unsigned long)stack);
115 for (i = 0; i < kstack_depth_to_print; i++) {
116 if (((long)stack & (THREAD_SIZE-1)) == 0)
118 if (i && ((i % 8) == 0))
120 if (__get_user(addr, stack)) {
121 /* This message matches "failing address" marked
122 s390 in ksymoops, so lines containing it will
123 not be filtered out by ksymoops. */
124 printk("Failing address 0x%lx\n", (unsigned long)stack);
128 printk("%08lx ", addr);
134 /* displays a short stack trace */
139 unsigned long *sp = (unsigned long *)rdusp();
142 printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
143 for (i = 0; i < 16; i++)
144 printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
150 set_nmi_handler(void (*handler)(struct pt_regs *))
152 nmi_handler = handler;
156 #ifdef CONFIG_DEBUG_NMI_OOPS
158 oops_nmi_handler(struct pt_regs *regs)
161 oops_in_progress = 1;
163 show_registers(regs);
164 oops_in_progress = 0;
168 oops_nmi_register(void)
170 set_nmi_handler(oops_nmi_handler);
174 __initcall(oops_nmi_register);
179 * This gets called from entry.S when the watchdog has bitten. Show something
180 * similar to an Oops dump, and if the kernel is configured to be a nice
181 * doggy, then halt instead of reboot.
184 watchdog_bite_hook(struct pt_regs *regs)
186 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
189 show_registers(regs);
194 show_registers(regs);
198 /* This is normally the Oops function. */
200 die_if_kernel(const char *str, struct pt_regs *regs, long err)
205 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
207 * This printout might take too long and could trigger
208 * the watchdog normally. If NICE_DOGGY is set, simply
209 * stop the watchdog during the printout.
216 printk("%s: %04lx\n", str, err & 0xffff);
218 show_registers(regs);
220 oops_in_progress = 0;
222 #ifdef CONFIG_ETRAX_WATCHDOG_NICE_DOGGY
231 /* Nothing needs to be done */