MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / arch / x86 / kernel / dumpstack_32.c
blob3b97a80ce32948ffa995f7b310024f901811703b
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/hardirq.h>
9 #include <linux/kdebug.h>
10 #include <linux/module.h>
11 #include <linux/ptrace.h>
12 #include <linux/kexec.h>
13 #include <linux/sysfs.h>
14 #include <linux/bug.h>
15 #include <linux/nmi.h>
17 #include <asm/stacktrace.h>
20 void dump_trace(struct task_struct *task, struct pt_regs *regs,
21 unsigned long *stack, unsigned long bp,
22 const struct stacktrace_ops *ops, void *data)
24 int graph = 0;
26 if (!task)
27 task = current;
29 if (!stack) {
30 unsigned long dummy;
32 stack = &dummy;
33 if (task && task != current)
34 stack = (unsigned long *)task->thread.sp;
37 if (!bp)
38 bp = stack_frame(task, regs);
40 for (;;) {
41 struct thread_info *context;
43 context = (struct thread_info *)
44 ((unsigned long)stack & (~(THREAD_SIZE - 1)));
45 bp = ops->walk_stack(context, stack, bp, ops, data, NULL, &graph);
47 stack = (unsigned long *)context->previous_esp;
48 if (!stack)
49 break;
50 if (ops->stack(data, "IRQ") < 0)
51 break;
52 touch_nmi_watchdog();
55 EXPORT_SYMBOL(dump_trace);
57 void
58 show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs,
59 unsigned long *sp, unsigned long bp, char *log_lvl)
61 unsigned long *stack;
62 int i;
64 if (sp == NULL) {
65 if (task)
66 sp = (unsigned long *)task->thread.sp;
67 else
68 sp = (unsigned long *)&sp;
71 stack = sp;
72 for (i = 0; i < kstack_depth_to_print; i++) {
73 if (kstack_end(stack))
74 break;
75 if (i && ((i % STACKSLOTS_PER_LINE) == 0))
76 printk(KERN_CONT "\n");
77 printk(KERN_CONT " %08lx", *stack++);
78 touch_nmi_watchdog();
80 printk(KERN_CONT "\n");
81 show_trace_log_lvl(task, regs, sp, bp, log_lvl);
85 void show_registers(struct pt_regs *regs)
87 int i;
89 print_modules();
90 __show_regs(regs, 0);
92 printk(KERN_EMERG "Process %.*s (pid: %d, ti=%p task=%p task.ti=%p)\n",
93 TASK_COMM_LEN, current->comm, task_pid_nr(current),
94 current_thread_info(), current, task_thread_info(current));
96 * When in-kernel, we also print out the stack and code at the
97 * time of the fault..
99 if (!user_mode_vm(regs)) {
100 unsigned int code_prologue = code_bytes * 43 / 64;
101 unsigned int code_len = code_bytes;
102 unsigned char c;
103 u8 *ip;
105 printk(KERN_EMERG "Stack:\n");
106 show_stack_log_lvl(NULL, regs, &regs->sp, 0, KERN_EMERG);
108 printk(KERN_EMERG "Code: ");
110 ip = (u8 *)regs->ip - code_prologue;
111 if (ip < (u8 *)PAGE_OFFSET || probe_kernel_address(ip, c)) {
112 /* try starting at IP */
113 ip = (u8 *)regs->ip;
114 code_len = code_len - code_prologue + 1;
116 for (i = 0; i < code_len; i++, ip++) {
117 if (ip < (u8 *)PAGE_OFFSET ||
118 probe_kernel_address(ip, c)) {
119 printk(" Bad EIP value.");
120 break;
122 if (ip == (u8 *)regs->ip)
123 printk("<%02x> ", c);
124 else
125 printk("%02x ", c);
128 printk("\n");
131 int is_valid_bugaddr(unsigned long ip)
133 unsigned short ud2;
135 if (ip < PAGE_OFFSET)
136 return 0;
137 if (probe_kernel_address((unsigned short *)ip, ud2))
138 return 0;
140 return ud2 == 0x0b0f;