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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 | /** * @file backtrace.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon * @author David Smith */ #include <linux/oprofile.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/compat.h> #include <linux/uaccess.h> #include <asm/ptrace.h> #include <asm/stacktrace.h> #include <asm/unwind.h> #ifdef CONFIG_COMPAT static struct stack_frame_ia32 * dump_user_backtrace_32(struct stack_frame_ia32 *head) { /* Also check accessibility of one struct frame_head beyond: */ struct stack_frame_ia32 bufhead[2]; struct stack_frame_ia32 *fp; unsigned long bytes; bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead)); if (bytes != 0) return NULL; fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame); oprofile_add_trace(bufhead[0].return_address); /* frame pointers should strictly progress back up the stack * (towards higher addresses) */ if (head >= fp) return NULL; return fp; } static inline int x86_backtrace_32(struct pt_regs * const regs, unsigned int depth) { struct stack_frame_ia32 *head; /* User process is IA32 */ if (!current || !test_thread_flag(TIF_IA32)) return 0; head = (struct stack_frame_ia32 *) regs->bp; while (depth-- && head) head = dump_user_backtrace_32(head); return 1; } #else static inline int x86_backtrace_32(struct pt_regs * const regs, unsigned int depth) { return 0; } #endif /* CONFIG_COMPAT */ static struct stack_frame *dump_user_backtrace(struct stack_frame *head) { /* Also check accessibility of one struct frame_head beyond: */ struct stack_frame bufhead[2]; unsigned long bytes; bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead)); if (bytes != 0) return NULL; oprofile_add_trace(bufhead[0].return_address); /* frame pointers should strictly progress back up the stack * (towards higher addresses) */ if (head >= bufhead[0].next_frame) return NULL; return bufhead[0].next_frame; } void x86_backtrace(struct pt_regs * const regs, unsigned int depth) { struct stack_frame *head = (struct stack_frame *)frame_pointer(regs); if (!user_mode(regs)) { struct unwind_state state; unsigned long addr; if (!depth) return; oprofile_add_trace(regs->ip); if (!--depth) return; for (unwind_start(&state, current, regs, NULL); !unwind_done(&state); unwind_next_frame(&state)) { addr = unwind_get_return_address(&state); if (!addr) break; oprofile_add_trace(addr); if (!--depth) break; } return; } if (x86_backtrace_32(regs, depth)) return; while (depth-- && head) head = dump_user_backtrace(head); } |