projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| b6ab06ce | 1 | /* Return backtrace of current program state. Generic version. |
| b168057a | 2 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
| b6ab06ce UD |
3 | This file is part of the GNU C Library. |
| 4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. | |
| 5 | ||
| 6 | The GNU C Library is free software; you can redistribute it and/or | |
| 7 | modify it under the terms of the GNU Lesser General Public | |
| 8 | License as published by the Free Software Foundation; either | |
| 9 | version 2.1 of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | The GNU C Library is distributed in the hope that it will be useful, | |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | Lesser General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Lesser General Public | |
| 59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
| 18 | <http://www.gnu.org/licenses/>. */ | |
| b6ab06ce UD |
19 | |
| 20 | #include <execinfo.h> | |
| 21 | #include <signal.h> | |
| 22 | #include <frame.h> | |
| 23 | #include <sigcontextinfo.h> | |
| b6ab06ce UD |
24 | #include <ldsodefs.h> |
| 25 | ||
| 26 | /* This implementation assumes a stack layout that matches the defaults | |
| 27 | used by gcc's `__builtin_frame_address' and `__builtin_return_address' | |
| 28 | (FP is the frame pointer register): | |
| 29 | ||
| 30 | +-----------------+ +-----------------+ | |
| 31 | FP -> | previous FP --------> | previous FP ------>... | |
| 32 | | | | | | |
| 33 | | return address | | return address | | |
| 34 | +-----------------+ +-----------------+ | |
| 35 | ||
| 36 | */ | |
| 37 | ||
| 38 | /* Get some notion of the current stack. Need not be exactly the top | |
| 39 | of the stack, just something somewhere in the current frame. */ | |
| 40 | #ifndef CURRENT_STACK_FRAME | |
| 41 | # define CURRENT_STACK_FRAME ({ char __csf; &__csf; }) | |
| 42 | #endif | |
| 43 | ||
| 44 | /* By default we assume that the stack grows downward. */ | |
| 45 | #ifndef INNER_THAN | |
| 46 | # define INNER_THAN < | |
| 47 | #endif | |
| 48 | ||
| 49 | /* By default assume the `next' pointer in struct layout points to the | |
| 50 | next struct layout. */ | |
| 51 | #ifndef ADVANCE_STACK_FRAME | |
| e782a927 | 52 | # define ADVANCE_STACK_FRAME(next) ((struct layout *) (next)) |
| b6ab06ce UD |
53 | #endif |
| 54 | ||
| 55 | /* By default, the frame pointer is just what we get from gcc. */ | |
| 56 | #ifndef FIRST_FRAME_POINTER | |
| 57 | # define FIRST_FRAME_POINTER __builtin_frame_address (0) | |
| 58 | #endif | |
| 59 | ||
| 60 | int | |
| 61 | __backtrace (array, size) | |
| 62 | void **array; | |
| 63 | int size; | |
| 64 | { | |
| 65 | struct layout *current; | |
| 70d9946a JM |
66 | void *top_frame; |
| 67 | void *top_stack; | |
| b6ab06ce UD |
68 | int cnt = 0; |
| 69 | ||
| 70 | top_frame = FIRST_FRAME_POINTER; | |
| 71 | top_stack = CURRENT_STACK_FRAME; | |
| 72 | ||
| 73 | /* We skip the call to this function, it makes no sense to record it. */ | |
| e782a927 | 74 | current = ((struct layout *) top_frame); |
| b6ab06ce UD |
75 | while (cnt < size) |
| 76 | { | |
| 77 | if ((void *) current INNER_THAN top_stack | |
| 78 | || !((void *) current INNER_THAN __libc_stack_end)) | |
| 79 | /* This means the address is out of range. Note that for the | |
| 80 | toplevel we see a frame pointer with value NULL which clearly is | |
| 81 | out of range. */ | |
| 82 | break; | |
| 83 | ||
| 84 | array[cnt++] = current->return_address; | |
| 85 | ||
| 86 | current = ADVANCE_STACK_FRAME (current->next); | |
| 87 | } | |
| 88 | ||
| 89 | return cnt; | |
| 90 | } | |
| 91 | weak_alias (__backtrace, backtrace) | |
| 92 | libc_hidden_def (__backtrace) |