2 * Copyright (C) 1991, 1992 Linus Torvalds
3 * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs
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>
13 #include <linux/ftrace.h>
14 #include <linux/kexec.h>
15 #include <linux/bug.h>
16 #include <linux/nmi.h>
17 #include <linux/sysfs.h>
19 #include <asm/stacktrace.h>
21 #include "dumpstack.h"
23 int panic_on_unrecovered_nmi;
25 unsigned int code_bytes = 64;
26 int kstack_depth_to_print = 3 * STACKSLOTS_PER_LINE;
27 static int die_counter;
29 void printk_address(unsigned long address, int reliable)
31 printk(" [<%p>] %s%pS\n", (void *) address,
32 reliable ? "" : "? ", (void *) address);
35 #ifdef CONFIG_FUNCTION_GRAPH_TRACER
37 print_ftrace_graph_addr(unsigned long addr, void *data,
38 const struct stacktrace_ops *ops,
39 struct thread_info *tinfo, int *graph)
41 struct task_struct *task = tinfo->task;
42 unsigned long ret_addr;
43 int index = task->curr_ret_stack;
45 if (addr != (unsigned long)return_to_handler)
48 if (!task->ret_stack || index < *graph)
52 ret_addr = task->ret_stack[index].ret;
54 ops->address(data, ret_addr, 1);
60 print_ftrace_graph_addr(unsigned long addr, void *data,
61 const struct stacktrace_ops *ops,
62 struct thread_info *tinfo, int *graph)
67 * x86-64 can have up to three kernel stacks:
70 * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
73 static inline int valid_stack_ptr(struct thread_info *tinfo,
74 void *p, unsigned int size, void *end)
78 if (p < end && p >= (end-THREAD_SIZE))
83 return p > t && p < t + THREAD_SIZE - size;
87 print_context_stack(struct thread_info *tinfo,
88 unsigned long *stack, unsigned long bp,
89 const struct stacktrace_ops *ops, void *data,
90 unsigned long *end, int *graph)
92 struct stack_frame *frame = (struct stack_frame *)bp;
94 while (valid_stack_ptr(tinfo, stack, sizeof(*stack), end)) {
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;
104 ops->address(data, addr, 0);
106 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
112 EXPORT_SYMBOL_GPL(print_context_stack);
115 print_context_stack_bp(struct thread_info *tinfo,
116 unsigned long *stack, unsigned long bp,
117 const struct stacktrace_ops *ops, void *data,
118 unsigned long *end, int *graph)
120 struct stack_frame *frame = (struct stack_frame *)bp;
121 unsigned long *ret_addr = &frame->return_address;
123 while (valid_stack_ptr(tinfo, ret_addr, sizeof(*ret_addr), end)) {
124 unsigned long addr = *ret_addr;
126 if (!__kernel_text_address(addr))
129 ops->address(data, addr, 1);
130 frame = frame->next_frame;
131 ret_addr = &frame->return_address;
132 print_ftrace_graph_addr(addr, data, ops, tinfo, graph);
135 return (unsigned long)frame;
137 EXPORT_SYMBOL_GPL(print_context_stack_bp);
141 print_trace_warning_symbol(void *data, char *msg, unsigned long symbol)
144 print_symbol(msg, symbol);
148 static void print_trace_warning(void *data, char *msg)
150 printk("%s%s\n", (char *)data, msg);
153 static int print_trace_stack(void *data, char *name)
155 printk("%s <%s> ", (char *)data, name);
160 * Print one address/symbol entries per line.
162 static void print_trace_address(void *data, unsigned long addr, int reliable)
164 touch_nmi_watchdog();
166 printk_address(addr, reliable);
169 static const struct stacktrace_ops print_trace_ops = {
170 .warning = print_trace_warning,
171 .warning_symbol = print_trace_warning_symbol,
172 .stack = print_trace_stack,
173 .address = print_trace_address,
174 .walk_stack = print_context_stack,
178 show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
179 unsigned long *stack, unsigned long bp, char *log_lvl)
181 printk("%sCall Trace:\n", log_lvl);
182 dump_trace(task, regs, stack, bp, &print_trace_ops, log_lvl);
185 void show_trace(struct task_struct *task, struct pt_regs *regs,
186 unsigned long *stack, unsigned long bp)
188 show_trace_log_lvl(task, regs, stack, bp, "");
191 void show_stack(struct task_struct *task, unsigned long *sp)
193 show_stack_log_lvl(task, NULL, sp, 0, "");
197 * The architecture-independent dump_stack generator
199 void dump_stack(void)
201 unsigned long bp = 0;
204 #ifdef CONFIG_FRAME_POINTER
209 printk("Pid: %d, comm: %.20s %s %s %.*s\n",
210 current->pid, current->comm, print_tainted(),
211 init_utsname()->release,
212 (int)strcspn(init_utsname()->version, " "),
213 init_utsname()->version);
214 show_trace(NULL, NULL, &stack, bp);
216 EXPORT_SYMBOL(dump_stack);
218 static arch_spinlock_t die_lock = __ARCH_SPIN_LOCK_UNLOCKED;
219 static int die_owner = -1;
220 static unsigned int die_nest_count;
222 unsigned __kprobes long oops_begin(void)
227 /* notify the hw-branch tracer so it may disable tracing and
228 add the last trace to the trace buffer -
229 the earlier this happens, the more useful the trace. */
230 trace_hw_branch_oops();
234 /* racy, but better than risking deadlock. */
235 raw_local_irq_save(flags);
236 cpu = smp_processor_id();
237 if (!arch_spin_trylock(&die_lock)) {
238 if (cpu == die_owner)
239 /* nested oops. should stop eventually */;
241 arch_spin_lock(&die_lock);
250 void __kprobes oops_end(unsigned long flags, struct pt_regs *regs, int signr)
252 if (regs && kexec_should_crash(current))
257 add_taint(TAINT_DIE);
260 /* Nest count reaches zero, release the lock. */
261 arch_spin_unlock(&die_lock);
262 raw_local_irq_restore(flags);
268 panic("Fatal exception in interrupt");
270 panic("Fatal exception");
274 int __kprobes __die(const char *str, struct pt_regs *regs, long err)
280 printk(KERN_EMERG "%s: %04lx [#%d] ", str, err & 0xffff, ++die_counter);
281 #ifdef CONFIG_PREEMPT
287 #ifdef CONFIG_DEBUG_PAGEALLOC
288 printk("DEBUG_PAGEALLOC");
291 sysfs_printk_last_file();
292 if (notify_die(DIE_OOPS, str, regs, err,
293 current->thread.trap_no, SIGSEGV) == NOTIFY_STOP)
296 show_registers(regs);
298 if (user_mode_vm(regs)) {
300 ss = regs->ss & 0xffff;
302 sp = kernel_stack_pointer(regs);
305 printk(KERN_EMERG "EIP: [<%08lx>] ", regs->ip);
306 print_symbol("%s", regs->ip);
307 printk(" SS:ESP %04x:%08lx\n", ss, sp);
309 /* Executive summary in case the oops scrolled away */
310 printk(KERN_ALERT "RIP ");
311 printk_address(regs->ip, 1);
312 printk(" RSP <%016lx>\n", regs->sp);
318 * This is gone through when something in the kernel has done something bad
319 * and is about to be terminated:
321 void die(const char *str, struct pt_regs *regs, long err)
323 unsigned long flags = oops_begin();
326 if (!user_mode_vm(regs))
327 report_bug(regs->ip, regs);
329 if (__die(str, regs, err))
331 oops_end(flags, regs, sig);
334 void notrace __kprobes
335 die_nmi(char *str, struct pt_regs *regs, int do_panic)
339 if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
343 * We are in trouble anyway, lets at least try
344 * to get a message out.
346 flags = oops_begin();
347 printk(KERN_EMERG "%s", str);
348 printk(" on CPU%d, ip %08lx, registers:\n",
349 smp_processor_id(), regs->ip);
350 show_registers(regs);
351 oops_end(flags, regs, 0);
352 if (do_panic || panic_on_oops)
353 panic("Non maskable interrupt");
359 static int __init oops_setup(char *s)
363 if (!strcmp(s, "panic"))
367 early_param("oops", oops_setup);
369 static int __init kstack_setup(char *s)
373 kstack_depth_to_print = simple_strtoul(s, NULL, 0);
376 early_param("kstack", kstack_setup);
378 static int __init code_bytes_setup(char *s)
380 code_bytes = simple_strtoul(s, NULL, 0);
381 if (code_bytes > 8192)
386 __setup("code_bytes=", code_bytes_setup);