add port definition for mcf UART driver
[linux-2.6/next.git] / arch / cris / kernel / traps.c
blob520d92205fed3ee5ace3a701e2daa37cbcbb4452
1 /* $Id: traps.c,v 1.11 2005/01/24 16:03:19 orjanf Exp $
3 * linux/arch/cris/traps.c
5 * Here we handle the break vectors not used by the system call
6 * mechanism, as well as some general stack/register dumping
7 * things.
8 *
9 * Copyright (C) 2000-2002 Axis Communications AB
11 * Authors: Bjorn Wesen
12 * Hans-Peter Nilsson
16 #include <linux/init.h>
17 #include <linux/module.h>
18 #include <asm/pgtable.h>
19 #include <asm/uaccess.h>
21 static int kstack_depth_to_print = 24;
23 extern int raw_printk(const char *fmt, ...);
25 void show_trace(unsigned long * stack)
27 unsigned long addr, module_start, module_end;
28 extern char _stext, _etext;
29 int i;
31 raw_printk("\nCall Trace: ");
33 i = 1;
34 module_start = VMALLOC_START;
35 module_end = VMALLOC_END;
37 while (((long) stack & (THREAD_SIZE-1)) != 0) {
38 if (__get_user (addr, stack)) {
39 /* This message matches "failing address" marked
40 s390 in ksymoops, so lines containing it will
41 not be filtered out by ksymoops. */
42 raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
43 break;
45 stack++;
48 * If the address is either in the text segment of the
49 * kernel, or in the region which contains vmalloc'ed
50 * memory, it *may* be the address of a calling
51 * routine; if so, print it so that someone tracing
52 * down the cause of the crash will be able to figure
53 * out the call path that was taken.
55 if (((addr >= (unsigned long) &_stext) &&
56 (addr <= (unsigned long) &_etext)) ||
57 ((addr >= module_start) && (addr <= module_end))) {
58 if (i && ((i % 8) == 0))
59 raw_printk("\n ");
60 raw_printk("[<%08lx>] ", addr);
61 i++;
67 * These constants are for searching for possible module text
68 * segments. MODULE_RANGE is a guess of how much space is likely
69 * to be vmalloced.
72 #define MODULE_RANGE (8*1024*1024)
75 * The output (format, strings and order) is adjusted to be usable with
76 * ksymoops-2.4.1 with some necessary CRIS-specific patches. Please don't
77 * change it unless you're serious about adjusting ksymoops and syncing
78 * with the ksymoops maintainer.
81 void
82 show_stack(struct task_struct *task, unsigned long *sp)
84 unsigned long *stack, addr;
85 int i;
88 * debugging aid: "show_stack(NULL);" prints a
89 * back trace.
92 if(sp == NULL) {
93 if (task)
94 sp = (unsigned long*)task->thread.ksp;
95 else
96 sp = (unsigned long*)rdsp();
99 stack = sp;
101 raw_printk("\nStack from %08lx:\n ", (unsigned long)stack);
102 for(i = 0; i < kstack_depth_to_print; i++) {
103 if (((long) stack & (THREAD_SIZE-1)) == 0)
104 break;
105 if (i && ((i % 8) == 0))
106 raw_printk("\n ");
107 if (__get_user (addr, stack)) {
108 /* This message matches "failing address" marked
109 s390 in ksymoops, so lines containing it will
110 not be filtered out by ksymoops. */
111 raw_printk ("Failing address 0x%lx\n", (unsigned long)stack);
112 break;
114 stack++;
115 raw_printk("%08lx ", addr);
117 show_trace(sp);
120 static void (*nmi_handler)(struct pt_regs*);
121 extern void arch_enable_nmi(void);
123 void set_nmi_handler(void (*handler)(struct pt_regs*))
125 nmi_handler = handler;
126 arch_enable_nmi();
129 void handle_nmi(struct pt_regs* regs)
131 if (nmi_handler)
132 nmi_handler(regs);
135 #ifdef CONFIG_DEBUG_NMI_OOPS
136 void oops_nmi_handler(struct pt_regs* regs)
138 stop_watchdog();
139 raw_printk("NMI!\n");
140 show_registers(regs);
143 static int
144 __init oops_nmi_register(void)
146 set_nmi_handler(oops_nmi_handler);
147 return 0;
150 __initcall(oops_nmi_register);
152 #endif
154 #if 0
155 /* displays a short stack trace */
157 int
158 show_stack()
160 unsigned long *sp = (unsigned long *)rdusp();
161 int i;
162 raw_printk("Stack dump [0x%08lx]:\n", (unsigned long)sp);
163 for(i = 0; i < 16; i++)
164 raw_printk("sp + %d: 0x%08lx\n", i*4, sp[i]);
165 return 0;
167 #endif
169 void dump_stack(void)
171 show_stack(NULL, NULL);
174 EXPORT_SYMBOL(dump_stack);
176 void __init
177 trap_init(void)
179 /* Nothing needs to be done */
182 void spinning_cpu(void* addr)
184 raw_printk("CPU %d spinning on %X\n", smp_processor_id(), addr);
185 dump_stack();