Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 1 | /* $Id: traps.c,v 1.11 2005/01/24 16:03:19 orjanf Exp $ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
| 3 | * linux/arch/cris/traps.c |
| 4 | * |
| 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 |
| 10 | * |
| 11 | * Authors: Bjorn Wesen |
| 12 | * Hans-Peter Nilsson |
| 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <asm/pgtable.h> |
| 19 | #include <asm/uaccess.h> |
| 20 | |
| 21 | static int kstack_depth_to_print = 24; |
| 22 | |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 23 | extern int raw_printk(const char *fmt, ...); |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | void show_trace(unsigned long * stack) |
| 26 | { |
| 27 | unsigned long addr, module_start, module_end; |
| 28 | extern char _stext, _etext; |
| 29 | int i; |
| 30 | |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 31 | raw_printk("\nCall Trace: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
| 33 | i = 1; |
| 34 | module_start = VMALLOC_START; |
| 35 | module_end = VMALLOC_END; |
| 36 | |
| 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. */ |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 42 | raw_printk ("Failing address 0x%lx\n", (unsigned long)stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | break; |
| 44 | } |
| 45 | stack++; |
| 46 | |
| 47 | /* |
| 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. |
| 54 | */ |
| 55 | if (((addr >= (unsigned long) &_stext) && |
| 56 | (addr <= (unsigned long) &_etext)) || |
| 57 | ((addr >= module_start) && (addr <= module_end))) { |
| 58 | if (i && ((i % 8) == 0)) |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 59 | raw_printk("\n "); |
| 60 | raw_printk("[<%08lx>] ", addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | i++; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /* |
| 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. |
| 70 | */ |
| 71 | |
| 72 | #define MODULE_RANGE (8*1024*1024) |
| 73 | |
| 74 | /* |
| 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. |
| 79 | */ |
| 80 | |
| 81 | void |
| 82 | show_stack(struct task_struct *task, unsigned long *sp) |
| 83 | { |
| 84 | unsigned long *stack, addr; |
| 85 | int i; |
| 86 | |
| 87 | /* |
| 88 | * debugging aid: "show_stack(NULL);" prints a |
| 89 | * back trace. |
| 90 | */ |
| 91 | |
| 92 | if(sp == NULL) { |
| 93 | if (task) |
| 94 | sp = (unsigned long*)task->thread.ksp; |
| 95 | else |
| 96 | sp = (unsigned long*)rdsp(); |
| 97 | } |
| 98 | |
| 99 | stack = sp; |
| 100 | |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 101 | raw_printk("\nStack from %08lx:\n ", (unsigned long)stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 106 | raw_printk("\n "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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. */ |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 111 | raw_printk ("Failing address 0x%lx\n", (unsigned long)stack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | break; |
| 113 | } |
| 114 | stack++; |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 115 | raw_printk("%08lx ", addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | show_trace(sp); |
| 118 | } |
| 119 | |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 120 | static void (*nmi_handler)(struct pt_regs*); |
| 121 | extern void arch_enable_nmi(void); |
| 122 | |
| 123 | void set_nmi_handler(void (*handler)(struct pt_regs*)) |
| 124 | { |
| 125 | nmi_handler = handler; |
| 126 | arch_enable_nmi(); |
| 127 | } |
| 128 | |
| 129 | void handle_nmi(struct pt_regs* regs) |
| 130 | { |
| 131 | if (nmi_handler) |
| 132 | nmi_handler(regs); |
| 133 | } |
| 134 | |
| 135 | #ifdef CONFIG_DEBUG_NMI_OOPS |
| 136 | void oops_nmi_handler(struct pt_regs* regs) |
| 137 | { |
| 138 | stop_watchdog(); |
| 139 | raw_printk("NMI!\n"); |
| 140 | show_registers(regs); |
| 141 | } |
| 142 | |
| 143 | static int |
| 144 | __init oops_nmi_register(void) |
| 145 | { |
| 146 | set_nmi_handler(oops_nmi_handler); |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | __initcall(oops_nmi_register); |
| 151 | |
| 152 | #endif |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | #if 0 |
| 155 | /* displays a short stack trace */ |
| 156 | |
| 157 | int |
| 158 | show_stack() |
| 159 | { |
| 160 | unsigned long *sp = (unsigned long *)rdusp(); |
| 161 | int i; |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 162 | raw_printk("Stack dump [0x%08lx]:\n", (unsigned long)sp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | for(i = 0; i < 16; i++) |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 164 | raw_printk("sp + %d: 0x%08lx\n", i*4, sp[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | return 0; |
| 166 | } |
| 167 | #endif |
| 168 | |
| 169 | void dump_stack(void) |
| 170 | { |
| 171 | show_stack(NULL, NULL); |
| 172 | } |
| 173 | |
| 174 | EXPORT_SYMBOL(dump_stack); |
| 175 | |
| 176 | void __init |
| 177 | trap_init(void) |
| 178 | { |
| 179 | /* Nothing needs to be done */ |
| 180 | } |
Mikael Starvik | 059163ca | 2005-07-27 11:44:32 -0700 | [diff] [blame] | 181 | |
| 182 | void spinning_cpu(void* addr) |
| 183 | { |
| 184 | raw_printk("CPU %d spinning on %X\n", smp_processor_id(), addr); |
| 185 | dump_stack(); |
| 186 | } |