Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/x86-64/traps.c |
| 3 | * |
| 4 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 5 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
| 6 | * |
| 7 | * Pentium III FXSR, SSE support |
| 8 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * 'Traps.c' handles hardware traps and faults after we have saved some |
| 13 | * state in 'entry.S'. |
| 14 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sched.h> |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/ptrace.h> |
| 20 | #include <linux/timer.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/delay.h> |
| 24 | #include <linux/spinlock.h> |
| 25 | #include <linux/interrupt.h> |
Randy Dunlap | 4b0ff1a | 2006-10-05 19:07:26 +0200 | [diff] [blame] | 26 | #include <linux/kallsyms.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/module.h> |
| 28 | #include <linux/moduleparam.h> |
akpm@osdl.org | 35faa71 | 2005-04-16 15:24:54 -0700 | [diff] [blame] | 29 | #include <linux/nmi.h> |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 30 | #include <linux/kprobes.h> |
Vivek Goyal | 8bcc528 | 2006-04-18 12:35:13 +0200 | [diff] [blame] | 31 | #include <linux/kexec.h> |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 32 | #include <linux/unwind.h> |
Andi Kleen | ab2bf0c | 2006-12-07 02:14:06 +0100 | [diff] [blame] | 33 | #include <linux/uaccess.h> |
Jeremy Fitzhardinge | c31a0bf | 2006-12-08 02:36:22 -0800 | [diff] [blame] | 34 | #include <linux/bug.h> |
Christoph Hellwig | 1eeb66a | 2007-05-08 00:27:03 -0700 | [diff] [blame^] | 35 | #include <linux/kdebug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | #include <asm/system.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <asm/io.h> |
| 39 | #include <asm/atomic.h> |
| 40 | #include <asm/debugreg.h> |
| 41 | #include <asm/desc.h> |
| 42 | #include <asm/i387.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/processor.h> |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 44 | #include <asm/unwind.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/smp.h> |
| 46 | #include <asm/pgalloc.h> |
| 47 | #include <asm/pda.h> |
| 48 | #include <asm/proto.h> |
| 49 | #include <asm/nmi.h> |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 50 | #include <asm/stacktrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | asmlinkage void divide_error(void); |
| 53 | asmlinkage void debug(void); |
| 54 | asmlinkage void nmi(void); |
| 55 | asmlinkage void int3(void); |
| 56 | asmlinkage void overflow(void); |
| 57 | asmlinkage void bounds(void); |
| 58 | asmlinkage void invalid_op(void); |
| 59 | asmlinkage void device_not_available(void); |
| 60 | asmlinkage void double_fault(void); |
| 61 | asmlinkage void coprocessor_segment_overrun(void); |
| 62 | asmlinkage void invalid_TSS(void); |
| 63 | asmlinkage void segment_not_present(void); |
| 64 | asmlinkage void stack_segment(void); |
| 65 | asmlinkage void general_protection(void); |
| 66 | asmlinkage void page_fault(void); |
| 67 | asmlinkage void coprocessor_error(void); |
| 68 | asmlinkage void simd_coprocessor_error(void); |
| 69 | asmlinkage void reserved(void); |
| 70 | asmlinkage void alignment_check(void); |
| 71 | asmlinkage void machine_check(void); |
| 72 | asmlinkage void spurious_interrupt_bug(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | static inline void conditional_sti(struct pt_regs *regs) |
| 75 | { |
| 76 | if (regs->eflags & X86_EFLAGS_IF) |
| 77 | local_irq_enable(); |
| 78 | } |
| 79 | |
John Blackwood | a65d17c | 2006-02-12 14:34:58 -0800 | [diff] [blame] | 80 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 81 | { |
| 82 | preempt_disable(); |
| 83 | if (regs->eflags & X86_EFLAGS_IF) |
| 84 | local_irq_enable(); |
| 85 | } |
| 86 | |
| 87 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 88 | { |
| 89 | if (regs->eflags & X86_EFLAGS_IF) |
| 90 | local_irq_disable(); |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 91 | /* Make sure to not schedule here because we could be running |
| 92 | on an exception stack. */ |
John Blackwood | a65d17c | 2006-02-12 14:34:58 -0800 | [diff] [blame] | 93 | preempt_enable_no_resched(); |
| 94 | } |
| 95 | |
Chuck Ebbert | 0741f4d | 2006-12-07 02:14:11 +0100 | [diff] [blame] | 96 | int kstack_depth_to_print = 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | #ifdef CONFIG_KALLSYMS |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 99 | void printk_address(unsigned long address) |
| 100 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | unsigned long offset = 0, symsize; |
| 102 | const char *symname; |
| 103 | char *modname; |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 104 | char *delim = ":"; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | char namebuf[128]; |
| 106 | |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 107 | symname = kallsyms_lookup(address, &symsize, &offset, |
| 108 | &modname, namebuf); |
| 109 | if (!symname) { |
| 110 | printk(" [<%016lx>]\n", address); |
| 111 | return; |
| 112 | } |
| 113 | if (!modname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | modname = delim = ""; |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 115 | printk(" [<%016lx>] %s%s%s%s+0x%lx/0x%lx\n", |
| 116 | address, delim, modname, delim, symname, offset, symsize); |
| 117 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | #else |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 119 | void printk_address(unsigned long address) |
| 120 | { |
| 121 | printk(" [<%016lx>]\n", address); |
| 122 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | #endif |
| 124 | |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 125 | static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack, |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 126 | unsigned *usedp, char **idp) |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 127 | { |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 128 | static char ids[][8] = { |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 129 | [DEBUG_STACK - 1] = "#DB", |
| 130 | [NMI_STACK - 1] = "NMI", |
| 131 | [DOUBLEFAULT_STACK - 1] = "#DF", |
| 132 | [STACKFAULT_STACK - 1] = "#SS", |
| 133 | [MCE_STACK - 1] = "#MC", |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 134 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
| 135 | [N_EXCEPTION_STACKS ... N_EXCEPTION_STACKS + DEBUG_STKSZ / EXCEPTION_STKSZ - 2] = "#DB[?]" |
| 136 | #endif |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 137 | }; |
| 138 | unsigned k; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 140 | /* |
| 141 | * Iterate over all exception stacks, and figure out whether |
| 142 | * 'stack' is in one of them: |
| 143 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 144 | for (k = 0; k < N_EXCEPTION_STACKS; k++) { |
Keith Owens | f574164 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 145 | unsigned long end = per_cpu(orig_ist, cpu).ist[k]; |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 146 | /* |
| 147 | * Is 'stack' above this exception frame's end? |
| 148 | * If yes then skip to the next frame. |
| 149 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 150 | if (stack >= end) |
| 151 | continue; |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 152 | /* |
| 153 | * Is 'stack' above this exception frame's start address? |
| 154 | * If yes then we found the right frame. |
| 155 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 156 | if (stack >= end - EXCEPTION_STKSZ) { |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 157 | /* |
| 158 | * Make sure we only iterate through an exception |
| 159 | * stack once. If it comes up for the second time |
| 160 | * then there's something wrong going on - just |
| 161 | * break out and return NULL: |
| 162 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 163 | if (*usedp & (1U << k)) |
| 164 | break; |
| 165 | *usedp |= 1U << k; |
| 166 | *idp = ids[k]; |
| 167 | return (unsigned long *)end; |
| 168 | } |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 169 | /* |
| 170 | * If this is a debug stack, and if it has a larger size than |
| 171 | * the usual exception stacks, then 'stack' might still |
| 172 | * be within the lower portion of the debug stack: |
| 173 | */ |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 174 | #if DEBUG_STKSZ > EXCEPTION_STKSZ |
| 175 | if (k == DEBUG_STACK - 1 && stack >= end - DEBUG_STKSZ) { |
| 176 | unsigned j = N_EXCEPTION_STACKS - 1; |
| 177 | |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 178 | /* |
| 179 | * Black magic. A large debug stack is composed of |
| 180 | * multiple exception stack entries, which we |
| 181 | * iterate through now. Dont look: |
| 182 | */ |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 183 | do { |
| 184 | ++j; |
| 185 | end -= EXCEPTION_STKSZ; |
| 186 | ids[j][4] = '1' + (j - N_EXCEPTION_STACKS); |
| 187 | } while (stack < end - EXCEPTION_STKSZ); |
| 188 | if (*usedp & (1U << j)) |
| 189 | break; |
| 190 | *usedp |= 1U << j; |
| 191 | *idp = ids[j]; |
| 192 | return (unsigned long *)end; |
| 193 | } |
| 194 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | } |
| 196 | return NULL; |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Andi Kleen | b615ebd | 2006-12-07 02:14:00 +0100 | [diff] [blame] | 199 | #define MSG(txt) ops->warning(data, txt) |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | /* |
| 202 | * x86-64 can have upto three kernel stacks: |
| 203 | * process stack |
| 204 | * interrupt stack |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 205 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | */ |
| 207 | |
Andi Kleen | c547c77 | 2006-11-28 20:12:59 +0100 | [diff] [blame] | 208 | static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) |
| 209 | { |
| 210 | void *t = (void *)tinfo; |
| 211 | return p > t && p < t + THREAD_SIZE - 3; |
| 212 | } |
| 213 | |
Andi Kleen | b615ebd | 2006-12-07 02:14:00 +0100 | [diff] [blame] | 214 | void dump_trace(struct task_struct *tsk, struct pt_regs *regs, |
| 215 | unsigned long *stack, |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 216 | struct stacktrace_ops *ops, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | { |
Andrew Morton | da68933 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 218 | const unsigned cpu = get_cpu(); |
Andi Kleen | b615ebd | 2006-12-07 02:14:00 +0100 | [diff] [blame] | 219 | unsigned long *irqstack_end = (unsigned long*)cpu_pda(cpu)->irqstackptr; |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 220 | unsigned used = 0; |
Andi Kleen | c547c77 | 2006-11-28 20:12:59 +0100 | [diff] [blame] | 221 | struct thread_info *tinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 223 | if (!tsk) |
| 224 | tsk = current; |
| 225 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 226 | if (!stack) { |
| 227 | unsigned long dummy; |
| 228 | stack = &dummy; |
| 229 | if (tsk && tsk != current) |
| 230 | stack = (unsigned long *)tsk->thread.rsp; |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 231 | } |
| 232 | |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 233 | /* |
| 234 | * Print function call entries within a stack. 'cond' is the |
| 235 | * "end of stackframe" condition, that the 'stack++' |
| 236 | * iteration will eventually trigger. |
| 237 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 238 | #define HANDLE_STACK(cond) \ |
| 239 | do while (cond) { \ |
Jan Beulich | 1b2f630 | 2006-01-11 22:46:45 +0100 | [diff] [blame] | 240 | unsigned long addr = *stack++; \ |
Andi Kleen | 446f713 | 2006-12-07 02:14:12 +0100 | [diff] [blame] | 241 | /* Use unlocked access here because except for NMIs \ |
| 242 | we should be already protected against module unloads */ \ |
| 243 | if (__kernel_text_address(addr)) { \ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 244 | /* \ |
| 245 | * If the address is either in the text segment of the \ |
| 246 | * kernel, or in the region which contains vmalloc'ed \ |
| 247 | * memory, it *may* be the address of a calling \ |
| 248 | * routine; if so, print it so that someone tracing \ |
| 249 | * down the cause of the crash will be able to figure \ |
| 250 | * out the call path that was taken. \ |
| 251 | */ \ |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 252 | ops->address(data, addr); \ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 253 | } \ |
| 254 | } while (0) |
| 255 | |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 256 | /* |
| 257 | * Print function call entries in all stacks, starting at the |
| 258 | * current stack address. If the stacks consist of nested |
| 259 | * exceptions |
| 260 | */ |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 261 | for (;;) { |
| 262 | char *id; |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 263 | unsigned long *estack_end; |
| 264 | estack_end = in_exception_stack(cpu, (unsigned long)stack, |
| 265 | &used, &id); |
| 266 | |
| 267 | if (estack_end) { |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 268 | if (ops->stack(data, id) < 0) |
| 269 | break; |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 270 | HANDLE_STACK (stack < estack_end); |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 271 | ops->stack(data, "<EOE>"); |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 272 | /* |
| 273 | * We link to the next stack via the |
| 274 | * second-to-last pointer (index -2 to end) in the |
| 275 | * exception stack: |
| 276 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 277 | stack = (unsigned long *) estack_end[-2]; |
| 278 | continue; |
| 279 | } |
| 280 | if (irqstack_end) { |
| 281 | unsigned long *irqstack; |
| 282 | irqstack = irqstack_end - |
| 283 | (IRQSTACKSIZE - 64) / sizeof(*irqstack); |
| 284 | |
| 285 | if (stack >= irqstack && stack < irqstack_end) { |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 286 | if (ops->stack(data, "IRQ") < 0) |
| 287 | break; |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 288 | HANDLE_STACK (stack < irqstack_end); |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 289 | /* |
| 290 | * We link to the next stack (which would be |
| 291 | * the process stack normally) the last |
| 292 | * pointer (index -1 to end) in the IRQ stack: |
| 293 | */ |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 294 | stack = (unsigned long *) (irqstack_end[-1]); |
| 295 | irqstack_end = NULL; |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 296 | ops->stack(data, "EOI"); |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 297 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
| 299 | } |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 300 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 302 | |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 303 | /* |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 304 | * This handles the process stack: |
Ingo Molnar | c9ca1ba | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 305 | */ |
OGAWA Hirofumi | 7523c4d | 2007-01-04 01:21:28 +0900 | [diff] [blame] | 306 | tinfo = task_thread_info(tsk); |
Andi Kleen | c547c77 | 2006-11-28 20:12:59 +0100 | [diff] [blame] | 307 | HANDLE_STACK (valid_stack_ptr(tinfo, stack)); |
Andi Kleen | 0a65800 | 2005-04-16 15:25:17 -0700 | [diff] [blame] | 308 | #undef HANDLE_STACK |
Andrew Morton | da68933 | 2006-12-07 02:14:02 +0100 | [diff] [blame] | 309 | put_cpu(); |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 310 | } |
| 311 | EXPORT_SYMBOL(dump_trace); |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 312 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 313 | static void |
| 314 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) |
| 315 | { |
| 316 | print_symbol(msg, symbol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | printk("\n"); |
| 318 | } |
| 319 | |
Andi Kleen | c0b766f | 2006-09-26 10:52:34 +0200 | [diff] [blame] | 320 | static void print_trace_warning(void *data, char *msg) |
| 321 | { |
| 322 | printk("%s\n", msg); |
| 323 | } |
| 324 | |
| 325 | static int print_trace_stack(void *data, char *name) |
| 326 | { |
| 327 | printk(" <%s> ", name); |
| 328 | return 0; |
| 329 | } |
| 330 | |
| 331 | static void print_trace_address(void *data, unsigned long addr) |
| 332 | { |
| 333 | printk_address(addr); |
| 334 | } |
| 335 | |
| 336 | static struct stacktrace_ops print_trace_ops = { |
| 337 | .warning = print_trace_warning, |
| 338 | .warning_symbol = print_trace_warning_symbol, |
| 339 | .stack = print_trace_stack, |
| 340 | .address = print_trace_address, |
| 341 | }; |
| 342 | |
| 343 | void |
| 344 | show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long *stack) |
| 345 | { |
| 346 | printk("\nCall Trace:\n"); |
| 347 | dump_trace(tsk, regs, stack, &print_trace_ops, NULL); |
| 348 | printk("\n"); |
| 349 | } |
| 350 | |
| 351 | static void |
| 352 | _show_stack(struct task_struct *tsk, struct pt_regs *regs, unsigned long *rsp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | { |
| 354 | unsigned long *stack; |
| 355 | int i; |
Andi Kleen | 151f8cc | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 356 | const int cpu = smp_processor_id(); |
Ravikiran G Thirumalai | df79efd | 2006-01-11 22:45:39 +0100 | [diff] [blame] | 357 | unsigned long *irqstack_end = (unsigned long *) (cpu_pda(cpu)->irqstackptr); |
| 358 | unsigned long *irqstack = (unsigned long *) (cpu_pda(cpu)->irqstackptr - IRQSTACKSIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
| 360 | // debugging aid: "show_stack(NULL, NULL);" prints the |
| 361 | // back trace for this cpu. |
| 362 | |
| 363 | if (rsp == NULL) { |
| 364 | if (tsk) |
| 365 | rsp = (unsigned long *)tsk->thread.rsp; |
| 366 | else |
| 367 | rsp = (unsigned long *)&rsp; |
| 368 | } |
| 369 | |
| 370 | stack = rsp; |
| 371 | for(i=0; i < kstack_depth_to_print; i++) { |
| 372 | if (stack >= irqstack && stack <= irqstack_end) { |
| 373 | if (stack == irqstack_end) { |
| 374 | stack = (unsigned long *) (irqstack_end[-1]); |
| 375 | printk(" <EOI> "); |
| 376 | } |
| 377 | } else { |
| 378 | if (((long) stack & (THREAD_SIZE-1)) == 0) |
| 379 | break; |
| 380 | } |
| 381 | if (i && ((i % 4) == 0)) |
Ingo Molnar | 3ac9493 | 2006-07-03 00:24:36 -0700 | [diff] [blame] | 382 | printk("\n"); |
| 383 | printk(" %016lx", *stack++); |
akpm@osdl.org | 35faa71 | 2005-04-16 15:24:54 -0700 | [diff] [blame] | 384 | touch_nmi_watchdog(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 386 | show_trace(tsk, regs, rsp); |
| 387 | } |
| 388 | |
| 389 | void show_stack(struct task_struct *tsk, unsigned long * rsp) |
| 390 | { |
| 391 | _show_stack(tsk, NULL, rsp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | |
| 394 | /* |
| 395 | * The architecture-independent dump_stack generator |
| 396 | */ |
| 397 | void dump_stack(void) |
| 398 | { |
| 399 | unsigned long dummy; |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 400 | show_trace(NULL, NULL, &dummy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | EXPORT_SYMBOL(dump_stack); |
| 404 | |
| 405 | void show_registers(struct pt_regs *regs) |
| 406 | { |
| 407 | int i; |
Vincent Hanquez | 76381fe | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 408 | int in_kernel = !user_mode(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | unsigned long rsp; |
Andi Kleen | 151f8cc | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 410 | const int cpu = smp_processor_id(); |
Ravikiran G Thirumalai | df79efd | 2006-01-11 22:45:39 +0100 | [diff] [blame] | 411 | struct task_struct *cur = cpu_pda(cpu)->pcurrent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Andi Kleen | d039c68 | 2007-05-02 19:27:08 +0200 | [diff] [blame] | 413 | rsp = regs->rsp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | printk("CPU %d ", cpu); |
| 415 | __show_regs(regs); |
| 416 | printk("Process %s (pid: %d, threadinfo %p, task %p)\n", |
Al Viro | e4f17c4 | 2006-01-12 01:05:38 -0800 | [diff] [blame] | 417 | cur->comm, cur->pid, task_thread_info(cur), cur); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | /* |
| 420 | * When in-kernel, we also print out the stack and code at the |
| 421 | * time of the fault.. |
| 422 | */ |
| 423 | if (in_kernel) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | printk("Stack: "); |
Jan Beulich | b538ed2 | 2006-06-26 13:57:32 +0200 | [diff] [blame] | 425 | _show_stack(NULL, regs, (unsigned long*)rsp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
| 427 | printk("\nCode: "); |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 428 | if (regs->rip < PAGE_OFFSET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | goto bad; |
| 430 | |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 431 | for (i=0; i<20; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | unsigned char c; |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 433 | if (__get_user(c, &((unsigned char*)regs->rip)[i])) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | bad: |
| 435 | printk(" Bad RIP value."); |
| 436 | break; |
| 437 | } |
| 438 | printk("%02x ", c); |
| 439 | } |
| 440 | } |
| 441 | printk("\n"); |
| 442 | } |
| 443 | |
Jeremy Fitzhardinge | c31a0bf | 2006-12-08 02:36:22 -0800 | [diff] [blame] | 444 | int is_valid_bugaddr(unsigned long rip) |
| 445 | { |
| 446 | unsigned short ud2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Jeremy Fitzhardinge | c31a0bf | 2006-12-08 02:36:22 -0800 | [diff] [blame] | 448 | if (__copy_from_user(&ud2, (const void __user *) rip, sizeof(ud2))) |
| 449 | return 0; |
| 450 | |
| 451 | return ud2 == 0x0b0f; |
| 452 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | |
Alexander Nyberg | 4f60fdf | 2005-05-25 12:31:28 -0700 | [diff] [blame] | 454 | #ifdef CONFIG_BUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | void out_of_line_bug(void) |
| 456 | { |
| 457 | BUG(); |
| 458 | } |
Andi Kleen | 2ee60e17 | 2006-06-26 13:59:44 +0200 | [diff] [blame] | 459 | EXPORT_SYMBOL(out_of_line_bug); |
Alexander Nyberg | 4f60fdf | 2005-05-25 12:31:28 -0700 | [diff] [blame] | 460 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | static DEFINE_SPINLOCK(die_lock); |
| 463 | static int die_owner = -1; |
Corey Minyard | cdc60a4 | 2006-05-08 15:17:22 +0200 | [diff] [blame] | 464 | static unsigned int die_nest_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 466 | unsigned __kprobes long oops_begin(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | { |
Andi Kleen | 151f8cc | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 468 | int cpu = smp_processor_id(); |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 469 | unsigned long flags; |
| 470 | |
Andrew Morton | abf0f10 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 471 | oops_enter(); |
| 472 | |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 473 | /* racy, but better than risking deadlock. */ |
| 474 | local_irq_save(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (!spin_trylock(&die_lock)) { |
| 476 | if (cpu == die_owner) |
| 477 | /* nested oops. should stop eventually */; |
| 478 | else |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 479 | spin_lock(&die_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
Corey Minyard | cdc60a4 | 2006-05-08 15:17:22 +0200 | [diff] [blame] | 481 | die_nest_count++; |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 482 | die_owner = cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | console_verbose(); |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 484 | bust_spinlocks(1); |
| 485 | return flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | } |
| 487 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 488 | void __kprobes oops_end(unsigned long flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | { |
| 490 | die_owner = -1; |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 491 | bust_spinlocks(0); |
Corey Minyard | cdc60a4 | 2006-05-08 15:17:22 +0200 | [diff] [blame] | 492 | die_nest_count--; |
| 493 | if (die_nest_count) |
| 494 | /* We still own the lock */ |
| 495 | local_irq_restore(flags); |
| 496 | else |
| 497 | /* Nest count reaches zero, release the lock. */ |
| 498 | spin_unlock_irqrestore(&die_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | if (panic_on_oops) |
Horms | 012c437 | 2006-08-13 23:24:22 -0700 | [diff] [blame] | 500 | panic("Fatal exception"); |
Andrew Morton | abf0f10 | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 501 | oops_exit(); |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 502 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 504 | void __kprobes __die(const char * str, struct pt_regs * regs, long err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | { |
| 506 | static int die_counter; |
| 507 | printk(KERN_EMERG "%s: %04lx [%u] ", str, err & 0xffff,++die_counter); |
| 508 | #ifdef CONFIG_PREEMPT |
| 509 | printk("PREEMPT "); |
| 510 | #endif |
| 511 | #ifdef CONFIG_SMP |
| 512 | printk("SMP "); |
| 513 | #endif |
| 514 | #ifdef CONFIG_DEBUG_PAGEALLOC |
| 515 | printk("DEBUG_PAGEALLOC"); |
| 516 | #endif |
| 517 | printk("\n"); |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 518 | notify_die(DIE_OOPS, str, regs, err, current->thread.trap_no, SIGSEGV); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | show_registers(regs); |
| 520 | /* Executive summary in case the oops scrolled away */ |
| 521 | printk(KERN_ALERT "RIP "); |
| 522 | printk_address(regs->rip); |
| 523 | printk(" RSP <%016lx>\n", regs->rsp); |
Vivek Goyal | 8bcc528 | 2006-04-18 12:35:13 +0200 | [diff] [blame] | 524 | if (kexec_should_crash(current)) |
| 525 | crash_kexec(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | void die(const char * str, struct pt_regs * regs, long err) |
| 529 | { |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 530 | unsigned long flags = oops_begin(); |
| 531 | |
Jeremy Fitzhardinge | c31a0bf | 2006-12-08 02:36:22 -0800 | [diff] [blame] | 532 | if (!user_mode(regs)) |
| 533 | report_bug(regs->rip); |
| 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | __die(str, regs, err); |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 536 | oops_end(flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | do_exit(SIGSEGV); |
| 538 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Andi Kleen | fac5855 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 540 | void __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | { |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 542 | unsigned long flags = oops_begin(); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | /* |
| 545 | * We are in trouble anyway, lets at least try |
| 546 | * to get a message out. |
| 547 | */ |
Andi Kleen | 151f8cc | 2006-09-26 10:52:37 +0200 | [diff] [blame] | 548 | printk(str, smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | show_registers(regs); |
Vivek Goyal | 8bcc528 | 2006-04-18 12:35:13 +0200 | [diff] [blame] | 550 | if (kexec_should_crash(current)) |
| 551 | crash_kexec(regs); |
Andi Kleen | fac5855 | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 552 | if (do_panic || panic_on_oops) |
| 553 | panic("Non maskable interrupt"); |
Jan Beulich | 1209140 | 2005-09-12 18:49:24 +0200 | [diff] [blame] | 554 | oops_end(flags); |
Corey Minyard | 8b1ffe95 | 2006-05-08 15:17:25 +0200 | [diff] [blame] | 555 | nmi_exit(); |
| 556 | local_irq_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | do_exit(SIGSEGV); |
| 558 | } |
| 559 | |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 560 | static void __kprobes do_trap(int trapnr, int signr, char *str, |
| 561 | struct pt_regs * regs, long error_code, |
| 562 | siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | { |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 564 | struct task_struct *tsk = current; |
| 565 | |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 566 | if (user_mode(regs)) { |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 567 | /* |
| 568 | * We want error_code and trap_no set for userspace |
| 569 | * faults and kernelspace faults which result in |
| 570 | * die(), but not kernelspace faults which are fixed |
| 571 | * up. die() gives the process no chance to handle |
| 572 | * the signal and notice the kernel fault information, |
| 573 | * so that won't result in polluting the information |
| 574 | * about previously queued, but not yet delivered, |
| 575 | * faults. See also do_general_protection below. |
| 576 | */ |
| 577 | tsk->thread.error_code = error_code; |
| 578 | tsk->thread.trap_no = trapnr; |
| 579 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | if (exception_trace && unhandled_signal(tsk, signr)) |
| 581 | printk(KERN_INFO |
| 582 | "%s[%d] trap %s rip:%lx rsp:%lx error:%lx\n", |
| 583 | tsk->comm, tsk->pid, str, |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 584 | regs->rip, regs->rsp, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | if (info) |
| 587 | force_sig_info(signr, info, tsk); |
| 588 | else |
| 589 | force_sig(signr, tsk); |
| 590 | return; |
| 591 | } |
| 592 | |
| 593 | |
| 594 | /* kernel trap */ |
| 595 | { |
| 596 | const struct exception_table_entry *fixup; |
| 597 | fixup = search_exception_tables(regs->rip); |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 598 | if (fixup) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | regs->rip = fixup->fixup; |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 600 | else { |
| 601 | tsk->thread.error_code = error_code; |
| 602 | tsk->thread.trap_no = trapnr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | die(str, regs, error_code); |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 604 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | return; |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | #define DO_ERROR(trapnr, signr, str, name) \ |
| 610 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ |
| 611 | { \ |
| 612 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 613 | == NOTIFY_STOP) \ |
| 614 | return; \ |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 615 | conditional_sti(regs); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
| 617 | } |
| 618 | |
| 619 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
| 620 | asmlinkage void do_##name(struct pt_regs * regs, long error_code) \ |
| 621 | { \ |
| 622 | siginfo_t info; \ |
| 623 | info.si_signo = signr; \ |
| 624 | info.si_errno = 0; \ |
| 625 | info.si_code = sicode; \ |
| 626 | info.si_addr = (void __user *)siaddr; \ |
| 627 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, signr) \ |
| 628 | == NOTIFY_STOP) \ |
| 629 | return; \ |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 630 | conditional_sti(regs); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
| 632 | } |
| 633 | |
| 634 | DO_ERROR_INFO( 0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->rip) |
| 635 | DO_ERROR( 4, SIGSEGV, "overflow", overflow) |
| 636 | DO_ERROR( 5, SIGSEGV, "bounds", bounds) |
Chuck Ebbert | 100c0e3 | 2006-01-11 22:46:00 +0100 | [diff] [blame] | 637 | DO_ERROR_INFO( 6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->rip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | DO_ERROR( 7, SIGSEGV, "device not available", device_not_available) |
| 639 | DO_ERROR( 9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun) |
| 640 | DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS) |
| 641 | DO_ERROR(11, SIGBUS, "segment not present", segment_not_present) |
| 642 | DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0) |
| 643 | DO_ERROR(18, SIGSEGV, "reserved", reserved) |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 644 | |
| 645 | /* Runs on IST stack */ |
| 646 | asmlinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 647 | { |
| 648 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
| 649 | 12, SIGBUS) == NOTIFY_STOP) |
| 650 | return; |
| 651 | preempt_conditional_sti(regs); |
| 652 | do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL); |
| 653 | preempt_conditional_cli(regs); |
| 654 | } |
Jan Beulich | eca37c1 | 2006-01-11 22:42:17 +0100 | [diff] [blame] | 655 | |
| 656 | asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) |
| 657 | { |
| 658 | static const char str[] = "double fault"; |
| 659 | struct task_struct *tsk = current; |
| 660 | |
| 661 | /* Return not checked because double check cannot be ignored */ |
| 662 | notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV); |
| 663 | |
| 664 | tsk->thread.error_code = error_code; |
| 665 | tsk->thread.trap_no = 8; |
| 666 | |
| 667 | /* This is always a kernel trap and never fixable (and thus must |
| 668 | never return). */ |
| 669 | for (;;) |
| 670 | die(str, regs, error_code); |
| 671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 673 | asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, |
| 674 | long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | { |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 676 | struct task_struct *tsk = current; |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | conditional_sti(regs); |
| 679 | |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 680 | if (user_mode(regs)) { |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 681 | tsk->thread.error_code = error_code; |
| 682 | tsk->thread.trap_no = 13; |
| 683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | if (exception_trace && unhandled_signal(tsk, SIGSEGV)) |
| 685 | printk(KERN_INFO |
| 686 | "%s[%d] general protection rip:%lx rsp:%lx error:%lx\n", |
| 687 | tsk->comm, tsk->pid, |
Roberto Nibali | 2b692a8 | 2006-03-25 16:29:55 +0100 | [diff] [blame] | 688 | regs->rip, regs->rsp, error_code); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | force_sig(SIGSEGV, tsk); |
| 691 | return; |
| 692 | } |
| 693 | |
| 694 | /* kernel gp */ |
| 695 | { |
| 696 | const struct exception_table_entry *fixup; |
| 697 | fixup = search_exception_tables(regs->rip); |
| 698 | if (fixup) { |
| 699 | regs->rip = fixup->fixup; |
| 700 | return; |
| 701 | } |
Andi Kleen | d189518 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 702 | |
| 703 | tsk->thread.error_code = error_code; |
| 704 | tsk->thread.trap_no = 13; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (notify_die(DIE_GPF, "general protection fault", regs, |
| 706 | error_code, 13, SIGSEGV) == NOTIFY_STOP) |
| 707 | return; |
| 708 | die("general protection fault", regs, error_code); |
| 709 | } |
| 710 | } |
| 711 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 712 | static __kprobes void |
| 713 | mem_parity_error(unsigned char reason, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | { |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 715 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
| 716 | reason); |
Andi Kleen | 9c5f8be | 2006-12-07 02:14:03 +0100 | [diff] [blame] | 717 | printk(KERN_EMERG "You have some hardware problem, likely on the PCI bus.\n"); |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 718 | |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 719 | if (panic_on_unrecovered_nmi) |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 720 | panic("NMI: Not continuing"); |
| 721 | |
| 722 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | /* Clear and disable the memory parity error line. */ |
| 725 | reason = (reason & 0xf) | 4; |
| 726 | outb(reason, 0x61); |
| 727 | } |
| 728 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 729 | static __kprobes void |
| 730 | io_check_error(unsigned char reason, struct pt_regs * regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | { |
| 732 | printk("NMI: IOCK error (debug interrupt?)\n"); |
| 733 | show_registers(regs); |
| 734 | |
| 735 | /* Re-enable the IOCK line, wait for a few seconds */ |
| 736 | reason = (reason & 0xf) | 8; |
| 737 | outb(reason, 0x61); |
| 738 | mdelay(2000); |
| 739 | reason &= ~8; |
| 740 | outb(reason, 0x61); |
| 741 | } |
| 742 | |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 743 | static __kprobes void |
| 744 | unknown_nmi_error(unsigned char reason, struct pt_regs * regs) |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 745 | { |
| 746 | printk(KERN_EMERG "Uhhuh. NMI received for unknown reason %02x.\n", |
| 747 | reason); |
| 748 | printk(KERN_EMERG "Do you have a strange power saving mode enabled?\n"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 749 | |
| 750 | if (panic_on_unrecovered_nmi) |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 751 | panic("NMI: Not continuing"); |
Don Zickus | 8da5add | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 752 | |
Don Zickus | c41c5cd | 2006-09-26 10:52:27 +0200 | [diff] [blame] | 753 | printk(KERN_EMERG "Dazed and confused, but trying to continue\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 756 | /* Runs on IST stack. This code must keep interrupts off all the time. |
| 757 | Nested NMIs are prevented by the CPU. */ |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 758 | asmlinkage __kprobes void default_do_nmi(struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | { |
| 760 | unsigned char reason = 0; |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 761 | int cpu; |
| 762 | |
| 763 | cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | /* Only the BSP gets external NMIs from the system. */ |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 766 | if (!cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | reason = get_nmi_reason(); |
| 768 | |
| 769 | if (!(reason & 0xc0)) { |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 770 | if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | == NOTIFY_STOP) |
| 772 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | /* |
| 774 | * Ok, so this is none of the documented NMI sources, |
| 775 | * so it must be the NMI watchdog. |
| 776 | */ |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 777 | if (nmi_watchdog_tick(regs,reason)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | return; |
Corey Minyard | f64da95 | 2007-05-08 00:23:58 -0700 | [diff] [blame] | 779 | if (notify_die(DIE_NMI_POST, "nmi_post", regs, reason, 2, 0) |
| 780 | == NOTIFY_STOP) |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 781 | if (!do_nmi_callback(regs,cpu)) |
Don Zickus | 3adbbcc | 2006-09-26 10:52:26 +0200 | [diff] [blame] | 782 | unknown_nmi_error(reason, regs); |
| 783 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | return; |
| 785 | } |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 786 | if (notify_die(DIE_NMI, "nmi", regs, reason, 2, SIGINT) == NOTIFY_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | return; |
| 788 | |
| 789 | /* AK: following checks seem to be broken on modern chipsets. FIXME */ |
| 790 | |
| 791 | if (reason & 0x80) |
| 792 | mem_parity_error(reason, regs); |
| 793 | if (reason & 0x40) |
| 794 | io_check_error(reason, regs); |
| 795 | } |
| 796 | |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 797 | /* runs on IST stack. */ |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 798 | asmlinkage void __kprobes do_int3(struct pt_regs * regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | { |
| 800 | if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP) == NOTIFY_STOP) { |
| 801 | return; |
| 802 | } |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 803 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | do_trap(3, SIGTRAP, "int3", regs, error_code, NULL); |
Andi Kleen | 40e59a6 | 2006-05-15 18:19:47 +0200 | [diff] [blame] | 805 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
| 807 | |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 808 | /* Help handler running on IST stack to switch back to user stack |
| 809 | for scheduling or signal handling. The actual stack switch is done in |
| 810 | entry.S */ |
Andi Kleen | eddb6fb | 2006-02-03 21:50:41 +0100 | [diff] [blame] | 811 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | { |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 813 | struct pt_regs *regs = eregs; |
| 814 | /* Did already sync */ |
| 815 | if (eregs == (struct pt_regs *)eregs->rsp) |
| 816 | ; |
| 817 | /* Exception from user space */ |
Vincent Hanquez | 76381fe | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 818 | else if (user_mode(eregs)) |
Al Viro | bb04923 | 2006-01-12 01:05:38 -0800 | [diff] [blame] | 819 | regs = task_pt_regs(current); |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 820 | /* Exception from kernel and interrupts are enabled. Move to |
| 821 | kernel process stack. */ |
| 822 | else if (eregs->eflags & X86_EFLAGS_IF) |
| 823 | regs = (struct pt_regs *)(eregs->rsp -= sizeof(struct pt_regs)); |
| 824 | if (eregs != regs) |
| 825 | *regs = *eregs; |
| 826 | return regs; |
| 827 | } |
| 828 | |
| 829 | /* runs on IST stack. */ |
Prasanna S Panchamukhi | 0f2fbdc | 2005-09-06 15:19:28 -0700 | [diff] [blame] | 830 | asmlinkage void __kprobes do_debug(struct pt_regs * regs, |
| 831 | unsigned long error_code) |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 832 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | unsigned long condition; |
| 834 | struct task_struct *tsk = current; |
| 835 | siginfo_t info; |
| 836 | |
Vincent Hanquez | e9129e5 | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 837 | get_debugreg(condition, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
| 839 | if (notify_die(DIE_DEBUG, "debug", regs, condition, error_code, |
Andi Kleen | daeeafe | 2005-04-16 15:25:13 -0700 | [diff] [blame] | 840 | SIGTRAP) == NOTIFY_STOP) |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 841 | return; |
Andi Kleen | daeeafe | 2005-04-16 15:25:13 -0700 | [diff] [blame] | 842 | |
John Blackwood | a65d17c | 2006-02-12 14:34:58 -0800 | [diff] [blame] | 843 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
| 845 | /* Mask out spurious debug traps due to lazy DR7 setting */ |
| 846 | if (condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3)) { |
| 847 | if (!tsk->thread.debugreg7) { |
| 848 | goto clear_dr7; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | tsk->thread.debugreg6 = condition; |
| 853 | |
| 854 | /* Mask out spurious TF errors due to lazy TF clearing */ |
Andi Kleen | daeeafe | 2005-04-16 15:25:13 -0700 | [diff] [blame] | 855 | if (condition & DR_STEP) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | /* |
| 857 | * The TF error should be masked out only if the current |
| 858 | * process is not traced and if the TRAP flag has been set |
| 859 | * previously by a tracing process (condition detected by |
| 860 | * the PT_DTRACE flag); remember that the i386 TRAP flag |
| 861 | * can be modified by the process itself in user mode, |
| 862 | * allowing programs to debug themselves without the ptrace() |
| 863 | * interface. |
| 864 | */ |
Vincent Hanquez | 76381fe | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 865 | if (!user_mode(regs)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | goto clear_TF_reenable; |
Andi Kleen | be61bff | 2005-04-16 15:24:57 -0700 | [diff] [blame] | 867 | /* |
| 868 | * Was the TF flag set by a debugger? If so, clear it now, |
| 869 | * so that register information is correct. |
| 870 | */ |
| 871 | if (tsk->ptrace & PT_DTRACE) { |
| 872 | regs->eflags &= ~TF_MASK; |
| 873 | tsk->ptrace &= ~PT_DTRACE; |
| 874 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | /* Ok, finally something we can handle */ |
| 878 | tsk->thread.trap_no = 1; |
| 879 | tsk->thread.error_code = error_code; |
| 880 | info.si_signo = SIGTRAP; |
| 881 | info.si_errno = 0; |
| 882 | info.si_code = TRAP_BRKPT; |
John Blackwood | 01b8faa | 2006-01-11 22:44:15 +0100 | [diff] [blame] | 883 | info.si_addr = user_mode(regs) ? (void __user *)regs->rip : NULL; |
| 884 | force_sig_info(SIGTRAP, &info, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | clear_dr7: |
Vincent Hanquez | e9129e5 | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 887 | set_debugreg(0UL, 7); |
John Blackwood | a65d17c | 2006-02-12 14:34:58 -0800 | [diff] [blame] | 888 | preempt_conditional_cli(regs); |
Andi Kleen | 6fefb0d | 2005-04-16 15:25:03 -0700 | [diff] [blame] | 889 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | |
| 891 | clear_TF_reenable: |
| 892 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | regs->eflags &= ~TF_MASK; |
John Blackwood | a65d17c | 2006-02-12 14:34:58 -0800 | [diff] [blame] | 894 | preempt_conditional_cli(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | } |
| 896 | |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 897 | static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | { |
| 899 | const struct exception_table_entry *fixup; |
| 900 | fixup = search_exception_tables(regs->rip); |
| 901 | if (fixup) { |
| 902 | regs->rip = fixup->fixup; |
| 903 | return 1; |
| 904 | } |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 905 | notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE); |
Andi Kleen | 3a848f6 | 2005-04-16 15:25:06 -0700 | [diff] [blame] | 906 | /* Illegal floating point operation in the kernel */ |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 907 | current->thread.trap_no = trapnr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | die(str, regs, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | return 0; |
| 910 | } |
| 911 | |
| 912 | /* |
| 913 | * Note that we play around with the 'TS' bit in an attempt to get |
| 914 | * the correct behaviour even in the presence of the asynchronous |
| 915 | * IRQ13 behaviour |
| 916 | */ |
| 917 | asmlinkage void do_coprocessor_error(struct pt_regs *regs) |
| 918 | { |
| 919 | void __user *rip = (void __user *)(regs->rip); |
| 920 | struct task_struct * task; |
| 921 | siginfo_t info; |
| 922 | unsigned short cwd, swd; |
| 923 | |
| 924 | conditional_sti(regs); |
Vincent Hanquez | 76381fe | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 925 | if (!user_mode(regs) && |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 926 | kernel_math_error(regs, "kernel x87 math error", 16)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | return; |
| 928 | |
| 929 | /* |
| 930 | * Save the info for the exception handler and clear the error. |
| 931 | */ |
| 932 | task = current; |
| 933 | save_init_fpu(task); |
| 934 | task->thread.trap_no = 16; |
| 935 | task->thread.error_code = 0; |
| 936 | info.si_signo = SIGFPE; |
| 937 | info.si_errno = 0; |
| 938 | info.si_code = __SI_FAULT; |
| 939 | info.si_addr = rip; |
| 940 | /* |
| 941 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 942 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 943 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 944 | * fault bit. We should only be taking one exception at a time, |
| 945 | * so if this combination doesn't produce any single exception, |
| 946 | * then we have a bad program that isn't synchronizing its FPU usage |
| 947 | * and it will suffer the consequences since we won't be able to |
| 948 | * fully reproduce the context of the exception |
| 949 | */ |
| 950 | cwd = get_fpu_cwd(task); |
| 951 | swd = get_fpu_swd(task); |
Chuck Ebbert | ff347b2 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 952 | switch (swd & ~cwd & 0x3f) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | case 0x000: |
| 954 | default: |
| 955 | break; |
| 956 | case 0x001: /* Invalid Op */ |
Chuck Ebbert | ff347b2 | 2005-09-12 18:49:25 +0200 | [diff] [blame] | 957 | /* |
| 958 | * swd & 0x240 == 0x040: Stack Underflow |
| 959 | * swd & 0x240 == 0x240: Stack Overflow |
| 960 | * User must clear the SF bit (0x40) if set |
| 961 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | info.si_code = FPE_FLTINV; |
| 963 | break; |
| 964 | case 0x002: /* Denormalize */ |
| 965 | case 0x010: /* Underflow */ |
| 966 | info.si_code = FPE_FLTUND; |
| 967 | break; |
| 968 | case 0x004: /* Zero Divide */ |
| 969 | info.si_code = FPE_FLTDIV; |
| 970 | break; |
| 971 | case 0x008: /* Overflow */ |
| 972 | info.si_code = FPE_FLTOVF; |
| 973 | break; |
| 974 | case 0x020: /* Precision */ |
| 975 | info.si_code = FPE_FLTRES; |
| 976 | break; |
| 977 | } |
| 978 | force_sig_info(SIGFPE, &info, task); |
| 979 | } |
| 980 | |
| 981 | asmlinkage void bad_intr(void) |
| 982 | { |
| 983 | printk("bad interrupt"); |
| 984 | } |
| 985 | |
| 986 | asmlinkage void do_simd_coprocessor_error(struct pt_regs *regs) |
| 987 | { |
| 988 | void __user *rip = (void __user *)(regs->rip); |
| 989 | struct task_struct * task; |
| 990 | siginfo_t info; |
| 991 | unsigned short mxcsr; |
| 992 | |
| 993 | conditional_sti(regs); |
Vincent Hanquez | 76381fe | 2005-06-23 00:08:46 -0700 | [diff] [blame] | 994 | if (!user_mode(regs) && |
Jan Beulich | 6e3f361 | 2006-01-11 22:42:14 +0100 | [diff] [blame] | 995 | kernel_math_error(regs, "kernel simd math error", 19)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | return; |
| 997 | |
| 998 | /* |
| 999 | * Save the info for the exception handler and clear the error. |
| 1000 | */ |
| 1001 | task = current; |
| 1002 | save_init_fpu(task); |
| 1003 | task->thread.trap_no = 19; |
| 1004 | task->thread.error_code = 0; |
| 1005 | info.si_signo = SIGFPE; |
| 1006 | info.si_errno = 0; |
| 1007 | info.si_code = __SI_FAULT; |
| 1008 | info.si_addr = rip; |
| 1009 | /* |
| 1010 | * The SIMD FPU exceptions are handled a little differently, as there |
| 1011 | * is only a single status/control register. Thus, to determine which |
| 1012 | * unmasked exception was caught we must mask the exception mask bits |
| 1013 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 1014 | */ |
| 1015 | mxcsr = get_fpu_mxcsr(task); |
| 1016 | switch (~((mxcsr & 0x1f80) >> 7) & (mxcsr & 0x3f)) { |
| 1017 | case 0x000: |
| 1018 | default: |
| 1019 | break; |
| 1020 | case 0x001: /* Invalid Op */ |
| 1021 | info.si_code = FPE_FLTINV; |
| 1022 | break; |
| 1023 | case 0x002: /* Denormalize */ |
| 1024 | case 0x010: /* Underflow */ |
| 1025 | info.si_code = FPE_FLTUND; |
| 1026 | break; |
| 1027 | case 0x004: /* Zero Divide */ |
| 1028 | info.si_code = FPE_FLTDIV; |
| 1029 | break; |
| 1030 | case 0x008: /* Overflow */ |
| 1031 | info.si_code = FPE_FLTOVF; |
| 1032 | break; |
| 1033 | case 0x020: /* Precision */ |
| 1034 | info.si_code = FPE_FLTRES; |
| 1035 | break; |
| 1036 | } |
| 1037 | force_sig_info(SIGFPE, &info, task); |
| 1038 | } |
| 1039 | |
| 1040 | asmlinkage void do_spurious_interrupt_bug(struct pt_regs * regs) |
| 1041 | { |
| 1042 | } |
| 1043 | |
| 1044 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) |
| 1045 | { |
| 1046 | } |
| 1047 | |
Jacob Shin | 89b831e | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 1048 | asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void) |
| 1049 | { |
| 1050 | } |
| 1051 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | /* |
| 1053 | * 'math_state_restore()' saves the current math information in the |
| 1054 | * old math state array, and gets the new ones from the current task |
| 1055 | * |
| 1056 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 1057 | * Don't touch unless you *really* know how it works. |
| 1058 | */ |
| 1059 | asmlinkage void math_state_restore(void) |
| 1060 | { |
| 1061 | struct task_struct *me = current; |
| 1062 | clts(); /* Allow maths ops (or we recurse) */ |
| 1063 | |
| 1064 | if (!used_math()) |
| 1065 | init_fpu(me); |
| 1066 | restore_fpu_checking(&me->thread.i387.fxsave); |
Al Viro | e4f17c4 | 2006-01-12 01:05:38 -0800 | [diff] [blame] | 1067 | task_thread_info(me)->status |= TS_USEDFPU; |
Arjan van de Ven | e07e23e | 2006-09-26 10:52:36 +0200 | [diff] [blame] | 1068 | me->fpu_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | } |
| 1070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1071 | void __init trap_init(void) |
| 1072 | { |
| 1073 | set_intr_gate(0,÷_error); |
| 1074 | set_intr_gate_ist(1,&debug,DEBUG_STACK); |
| 1075 | set_intr_gate_ist(2,&nmi,NMI_STACK); |
Jan Beulich | b556b35 | 2006-01-11 22:43:00 +0100 | [diff] [blame] | 1076 | set_system_gate_ist(3,&int3,DEBUG_STACK); /* int3 can be called from all */ |
Jan Beulich | 0a52158 | 2006-01-11 22:42:08 +0100 | [diff] [blame] | 1077 | set_system_gate(4,&overflow); /* int4 can be called from all */ |
| 1078 | set_intr_gate(5,&bounds); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | set_intr_gate(6,&invalid_op); |
| 1080 | set_intr_gate(7,&device_not_available); |
| 1081 | set_intr_gate_ist(8,&double_fault, DOUBLEFAULT_STACK); |
| 1082 | set_intr_gate(9,&coprocessor_segment_overrun); |
| 1083 | set_intr_gate(10,&invalid_TSS); |
| 1084 | set_intr_gate(11,&segment_not_present); |
| 1085 | set_intr_gate_ist(12,&stack_segment,STACKFAULT_STACK); |
| 1086 | set_intr_gate(13,&general_protection); |
| 1087 | set_intr_gate(14,&page_fault); |
| 1088 | set_intr_gate(15,&spurious_interrupt_bug); |
| 1089 | set_intr_gate(16,&coprocessor_error); |
| 1090 | set_intr_gate(17,&alignment_check); |
| 1091 | #ifdef CONFIG_X86_MCE |
| 1092 | set_intr_gate_ist(18,&machine_check, MCE_STACK); |
| 1093 | #endif |
| 1094 | set_intr_gate(19,&simd_coprocessor_error); |
| 1095 | |
| 1096 | #ifdef CONFIG_IA32_EMULATION |
| 1097 | set_system_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
| 1098 | #endif |
| 1099 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | /* |
| 1101 | * Should be a barrier for any external CPU state. |
| 1102 | */ |
| 1103 | cpu_init(); |
| 1104 | } |
| 1105 | |
| 1106 | |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1107 | static int __init oops_setup(char *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | { |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1109 | if (!s) |
| 1110 | return -EINVAL; |
| 1111 | if (!strcmp(s, "panic")) |
| 1112 | panic_on_oops = 1; |
| 1113 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1114 | } |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1115 | early_param("oops", oops_setup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1116 | |
| 1117 | static int __init kstack_setup(char *s) |
| 1118 | { |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1119 | if (!s) |
| 1120 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1121 | kstack_depth_to_print = simple_strtoul(s,NULL,0); |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1122 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | } |
Andi Kleen | 2c8c0e6 | 2006-09-26 10:52:32 +0200 | [diff] [blame] | 1124 | early_param("kstack", kstack_setup); |