4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
11 #include <linux/oprofile.h>
12 #include <linux/sched.h>
14 #include <asm/ptrace.h>
15 #include <asm/uaccess.h>
16 #include <asm/stacktrace.h>
17 #include <linux/compat.h>
19 static int backtrace_stack(void *data, char *name)
21 /* Yes, we want all stacks */
25 static void backtrace_address(void *data, unsigned long addr, int reliable)
27 unsigned int *depth = data;
30 oprofile_add_trace(addr);
33 static struct stacktrace_ops backtrace_ops = {
34 .stack = backtrace_stack,
35 .address = backtrace_address,
36 .walk_stack = print_context_stack,
40 static struct stack_frame_ia32 *
41 dump_user_backtrace_32(struct stack_frame_ia32 *head)
43 struct stack_frame_ia32 bufhead[2];
44 struct stack_frame_ia32 *fp;
46 /* Also check accessibility of one struct frame_head beyond */
47 if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
49 if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
52 fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
54 oprofile_add_trace(bufhead[0].return_address);
56 /* frame pointers should strictly progress back up the stack
57 * (towards higher addresses) */
65 x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
67 struct stack_frame_ia32 *head;
69 /* User process is 32-bit */
70 if (!current || !test_thread_flag(TIF_IA32))
73 head = (struct stack_frame_ia32 *) regs->bp;
74 while (depth-- && head)
75 head = dump_user_backtrace_32(head);
82 x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
86 #endif /* CONFIG_COMPAT */
88 static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
90 struct stack_frame bufhead[2];
92 /* Also check accessibility of one struct stack_frame beyond */
93 if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
95 if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
98 oprofile_add_trace(bufhead[0].return_address);
100 /* frame pointers should strictly progress back up the stack
101 * (towards higher addresses) */
102 if (head >= bufhead[0].next_frame)
105 return bufhead[0].next_frame;
109 x86_backtrace(struct pt_regs * const regs, unsigned int depth)
111 struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
113 if (!user_mode_vm(regs)) {
114 unsigned long stack = kernel_stack_pointer(regs);
116 dump_trace(NULL, regs, (unsigned long *)stack, 0,
117 &backtrace_ops, &depth);
121 if (x86_backtrace_32(regs, depth))
124 while (depth-- && head)
125 head = dump_user_backtrace(head);