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Commit | Line | Data |
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878719e8 NH |
1 | /* |
2 | * Copyright (C) 1991, 1992 Linus Torvalds | |
3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs | |
4 | */ | |
5 | #include <linux/kallsyms.h> | |
6 | #include <linux/kprobes.h> | |
7 | #include <linux/uaccess.h> | |
8 | #include <linux/utsname.h> | |
9 | #include <linux/hardirq.h> | |
10 | #include <linux/kdebug.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/ptrace.h> | |
712406a6 | 13 | #include <linux/ftrace.h> |
878719e8 NH |
14 | #include <linux/kexec.h> |
15 | #include <linux/bug.h> | |
16 | #include <linux/nmi.h> | |
17 | #include <linux/sysfs.h> | |
18 | ||
19 | #include <asm/stacktrace.h> | |
20 | ||
21 | #include "dumpstack.h" | |
22 | ||
23 | int panic_on_unrecovered_nmi; | |
5211a242 | 24 | int panic_on_io_nmi; |
878719e8 NH |
25 | unsigned int code_bytes = 64; |
26 | int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE; | |
27 | static int die_counter; | |
28 | ||
29 | void printk_address(unsigned long address, int reliable) | |
30 | { | |
31 | printk(" [<%p>] %s%pS\n", (void *) address, | |
32 | reliable ? "" : "? ", (void *) address); | |
33 | } | |
34 | ||
7ee991fb SR |
35 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
36 | static void | |
37 | print_ftrace_graph_addr(unsigned long addr, void *data, | |
38 | const struct stacktrace_ops *ops, | |
39 | struct thread_info *tinfo, int *graph) | |
40 | { | |
41 | struct task_struct *task = tinfo->task; | |
42 | unsigned long ret_addr; | |
43 | int index = task->curr_ret_stack; | |
44 | ||
45 | if (addr != (unsigned long)return_to_handler) | |
46 | return; | |
47 | ||
48 | if (!task->ret_stack || index < *graph) | |
49 | return; | |
50 | ||
51 | index -= *graph; | |
52 | ret_addr = task->ret_stack[index].ret; | |
53 | ||
54 | ops->address(data, ret_addr, 1); | |
55 | ||
56 | (*graph)++; | |
57 | } | |
58 | #else | |
59 | static inline void | |
60 | print_ftrace_graph_addr(unsigned long addr, void *data, | |
61 | const struct stacktrace_ops *ops, | |
62 | struct thread_info *tinfo, int *graph) | |
63 | { } | |
64 | #endif | |
65 | ||
878719e8 NH |
66 | /* |
67 | * x86-64 can have up to three kernel stacks: | |
68 | * process stack | |
69 | * interrupt stack | |
70 | * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack | |
71 | */ | |
72 | ||
73 | static inline int valid_stack_ptr(struct thread_info *tinfo, | |
74 | void *p, unsigned int size, void *end) | |
75 | { | |
76 | void *t = tinfo; | |
77 | if (end) { | |
78 | if (p < end && p >= (end-THREAD_SIZE)) | |
79 | return 1; | |
80 | else | |
81 | return 0; | |
82 | } | |
83 | return p > t && p < t + THREAD_SIZE - size; | |
84 | } | |
85 | ||
86 | unsigned long | |
87 | print_context_stack(struct thread_info *tinfo, | |
88 | unsigned long *stack, unsigned long bp, | |
89 | const struct stacktrace_ops *ops, void *data, | |
7ee991fb | 90 | unsigned long *end, int *graph) |
878719e8 NH |
91 | { |
92 | struct stack_frame *frame = (struct stack_frame *)bp; | |
93 | ||
94 | while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) { | |
95 | unsigned long addr; | |
96 | ||
97 | addr = *stack; | |
98 | if (__kernel_text_address(addr)) { | |
99 | if ((unsigned long) stack == bp + sizeof(long)) { | |
100 | ops->address(data, addr, 1); | |
101 | frame = frame->next_frame; | |
102 | bp = (unsigned long) frame; | |
103 | } else { | |
2c344e9d | 104 | ops->address(data, addr, 0); |
878719e8 | 105 | } |
7ee991fb | 106 | print_ftrace_graph_addr(addr, data, ops, tinfo, graph); |
878719e8 NH |
107 | } |
108 | stack++; | |
109 | } | |
110 | return bp; | |
111 | } | |
112 | ||
113 | ||
114 | static void | |
115 | print_trace_warning_symbol(void *data, char *msg, unsigned long symbol) | |
116 | { | |
117 | printk(data); | |
118 | print_symbol(msg, symbol); | |
119 | printk("\n"); | |
120 | } | |
121 | ||
122 | static void print_trace_warning(void *data, char *msg) | |
123 | { | |
124 | printk("%s%s\n", (char *)data, msg); | |
125 | } | |
126 | ||
127 | static int print_trace_stack(void *data, char *name) | |
128 | { | |
129 | printk("%s <%s> ", (char *)data, name); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Print one address/symbol entries per line. | |
135 | */ | |
136 | static void print_trace_address(void *data, unsigned long addr, int reliable) | |
137 | { | |
138 | touch_nmi_watchdog(); | |
139 | printk(data); | |
140 | printk_address(addr, reliable); | |
141 | } | |
142 | ||
143 | static const struct stacktrace_ops print_trace_ops = { | |
144 | .warning = print_trace_warning, | |
145 | .warning_symbol = print_trace_warning_symbol, | |
146 | .stack = print_trace_stack, | |
147 | .address = print_trace_address, | |
148 | }; | |
149 | ||
150 | void | |
151 | show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, | |
152 | unsigned long *stack, unsigned long bp, char *log_lvl) | |
153 | { | |
154 | printk("%sCall Trace:\n", log_lvl); | |
155 | dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl); | |
156 | } | |
157 | ||
158 | void show_trace(struct task_struct *task, struct pt_regs *regs, | |
159 | unsigned long *stack, unsigned long bp) | |
160 | { | |
161 | show_trace_log_lvl(task, regs, stack, bp, ""); | |
162 | } | |
163 | ||
164 | void show_stack(struct task_struct *task, unsigned long *sp) | |
165 | { | |
166 | show_stack_log_lvl(task, NULL, sp, 0, ""); | |
167 | } | |
168 | ||
169 | /* | |
170 | * The architecture-independent dump_stack generator | |
171 | */ | |
172 | void dump_stack(void) | |
173 | { | |
174 | unsigned long bp = 0; | |
175 | unsigned long stack; | |
176 | ||
177 | #ifdef CONFIG_FRAME_POINTER | |
178 | if (!bp) | |
179 | get_bp(bp); | |
180 | #endif | |
181 | ||
182 | printk("Pid: %d, comm: %.20s %s %s %.*s\n", | |
183 | current->pid, current->comm, print_tainted(), | |
184 | init_utsname()->release, | |
185 | (int)strcspn(init_utsname()->version, " "), | |
186 | init_utsname()->version); | |
187 | show_trace(NULL, NULL, &stack, bp); | |
188 | } | |
189 | EXPORT_SYMBOL(dump_stack); | |
190 | ||
191 | static raw_spinlock_t die_lock = __RAW_SPIN_LOCK_UNLOCKED; | |
192 | static int die_owner = -1; | |
193 | static unsigned int die_nest_count; | |
194 | ||
195 | unsigned __kprobes long oops_begin(void) | |
196 | { | |
197 | int cpu; | |
198 | unsigned long flags; | |
199 | ||
b1818748 MM |
200 | /* notify the hw-branch tracer so it may disable tracing and |
201 | add the last trace to the trace buffer - | |
202 | the earlier this happens, the more useful the trace. */ | |
203 | trace_hw_branch_oops(); | |
204 | ||
878719e8 NH |
205 | oops_enter(); |
206 | ||
207 | /* racy, but better than risking deadlock. */ | |
208 | raw_local_irq_save(flags); | |
209 | cpu = smp_processor_id(); | |
210 | if (!__raw_spin_trylock(&die_lock)) { | |
211 | if (cpu == die_owner) | |
212 | /* nested oops. should stop eventually */; | |
213 | else | |
214 | __raw_spin_lock(&die_lock); | |
215 | } | |
216 | die_nest_count++; | |
217 | die_owner = cpu; | |
218 | console_verbose(); | |
219 | bust_spinlocks(1); | |
220 | return flags; | |
221 | } | |
222 | ||
223 | void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr) | |
224 | { | |
225 | if (regs && kexec_should_crash(current)) | |
226 | crash_kexec(regs); | |
227 | ||
228 | bust_spinlocks(0); | |
229 | die_owner = -1; | |
230 | add_taint(TAINT_DIE); | |
231 | die_nest_count--; | |
232 | if (!die_nest_count) | |
233 | /* Nest count reaches zero, release the lock. */ | |
234 | __raw_spin_unlock(&die_lock); | |
235 | raw_local_irq_restore(flags); | |
236 | oops_exit(); | |
237 | ||
238 | if (!signr) | |
239 | return; | |
240 | if (in_interrupt()) | |
241 | panic("Fatal exception in interrupt"); | |
242 | if (panic_on_oops) | |
243 | panic("Fatal exception"); | |
244 | do_exit(signr); | |
245 | } | |
246 | ||
247 | int __kprobes __die(const char *str, struct pt_regs *regs, long err) | |
248 | { | |
249 | #ifdef CONFIG_X86_32 | |
250 | unsigned short ss; | |
251 | unsigned long sp; | |
252 | #endif | |
253 | printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter); | |
254 | #ifdef CONFIG_PREEMPT | |
255 | printk("PREEMPT "); | |
256 | #endif | |
257 | #ifdef CONFIG_SMP | |
258 | printk("SMP "); | |
259 | #endif | |
260 | #ifdef CONFIG_DEBUG_PAGEALLOC | |
261 | printk("DEBUG_PAGEALLOC"); | |
262 | #endif | |
263 | printk("\n"); | |
264 | sysfs_printk_last_file(); | |
265 | if (notify_die(DIE_OOPS, str, regs, err, | |
266 | current->thread.trap_no, SIGSEGV) == NOTIFY_STOP) | |
267 | return 1; | |
268 | ||
269 | show_registers(regs); | |
270 | #ifdef CONFIG_X86_32 | |
271 | sp = (unsigned long) (®s->sp); | |
272 | savesegment(ss, ss); | |
273 | if (user_mode(regs)) { | |
274 | sp = regs->sp; | |
275 | ss = regs->ss & 0xffff; | |
276 | } | |
277 | printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip); | |
278 | print_symbol("%s", regs->ip); | |
279 | printk(" SS:ESP %04x:%08lx\n", ss, sp); | |
280 | #else | |
281 | /* Executive summary in case the oops scrolled away */ | |
282 | printk(KERN_ALERT "RIP "); | |
283 | printk_address(regs->ip, 1); | |
284 | printk(" RSP <%016lx>\n", regs->sp); | |
285 | #endif | |
286 | return 0; | |
287 | } | |
288 | ||
289 | /* | |
290 | * This is gone through when something in the kernel has done something bad | |
291 | * and is about to be terminated: | |
292 | */ | |
293 | void die(const char *str, struct pt_regs *regs, long err) | |
294 | { | |
295 | unsigned long flags = oops_begin(); | |
296 | int sig = SIGSEGV; | |
297 | ||
298 | if (!user_mode_vm(regs)) | |
299 | report_bug(regs->ip, regs); | |
300 | ||
301 | if (__die(str, regs, err)) | |
302 | sig = 0; | |
303 | oops_end(flags, regs, sig); | |
304 | } | |
305 | ||
306 | void notrace __kprobes | |
307 | die_nmi(char *str, struct pt_regs *regs, int do_panic) | |
308 | { | |
309 | unsigned long flags; | |
310 | ||
311 | if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP) | |
312 | return; | |
313 | ||
314 | /* | |
315 | * We are in trouble anyway, lets at least try | |
316 | * to get a message out. | |
317 | */ | |
318 | flags = oops_begin(); | |
319 | printk(KERN_EMERG "%s", str); | |
320 | printk(" on CPU%d, ip %08lx, registers:\n", | |
321 | smp_processor_id(), regs->ip); | |
322 | show_registers(regs); | |
323 | oops_end(flags, regs, 0); | |
324 | if (do_panic || panic_on_oops) | |
325 | panic("Non maskable interrupt"); | |
326 | nmi_exit(); | |
327 | local_irq_enable(); | |
328 | do_exit(SIGBUS); | |
329 | } | |
330 | ||
331 | static int __init oops_setup(char *s) | |
332 | { | |
333 | if (!s) | |
334 | return -EINVAL; | |
335 | if (!strcmp(s, "panic")) | |
336 | panic_on_oops = 1; | |
337 | return 0; | |
338 | } | |
339 | early_param("oops", oops_setup); | |
340 | ||
341 | static int __init kstack_setup(char *s) | |
342 | { | |
343 | if (!s) | |
344 | return -EINVAL; | |
345 | kstack_depth_to_print = simple_strtoul(s, NULL, 0); | |
346 | return 0; | |
347 | } | |
348 | early_param("kstack", kstack_setup); | |
349 | ||
350 | static int __init code_bytes_setup(char *s) | |
351 | { | |
352 | code_bytes = simple_strtoul(s, NULL, 0); | |
353 | if (code_bytes > 8192) | |
354 | code_bytes = 8192; | |
355 | ||
356 | return 1; | |
357 | } | |
358 | __setup("code_bytes=", code_bytes_setup); |