The Android Open Source Project | dd7bc33 | 2009-03-03 19:32:55 -0800 | [diff] [blame] | 1 | /* system/debuggerd/utility.c |
| 2 | ** |
| 3 | ** Copyright 2008, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | #include <sys/ptrace.h> |
| 19 | #include <sys/exec_elf.h> |
| 20 | #include <assert.h> |
| 21 | #include <string.h> |
| 22 | #include <errno.h> |
| 23 | |
| 24 | #include "utility.h" |
| 25 | |
| 26 | /* Get a word from pid using ptrace. The result is the return value. */ |
| 27 | int get_remote_word(int pid, void *src) |
| 28 | { |
| 29 | return ptrace(PTRACE_PEEKTEXT, pid, src, NULL); |
| 30 | } |
| 31 | |
| 32 | |
| 33 | /* Handy routine to read aggregated data from pid using ptrace. The read |
| 34 | * values are written to the dest locations directly. |
| 35 | */ |
| 36 | void get_remote_struct(int pid, void *src, void *dst, size_t size) |
| 37 | { |
| 38 | unsigned int i; |
| 39 | |
| 40 | for (i = 0; i+4 <= size; i+=4) { |
| 41 | *(int *)(dst+i) = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL); |
| 42 | } |
| 43 | |
| 44 | if (i < size) { |
| 45 | int val; |
| 46 | |
| 47 | assert((size - i) < 4); |
| 48 | val = ptrace(PTRACE_PEEKTEXT, pid, src+i, NULL); |
| 49 | while (i < size) { |
| 50 | ((unsigned char *)dst)[i] = val & 0xff; |
| 51 | i++; |
| 52 | val >>= 8; |
| 53 | } |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /* Map a pc address to the name of the containing ELF file */ |
| 58 | const char *map_to_name(mapinfo *mi, unsigned pc, const char* def) |
| 59 | { |
| 60 | while(mi) { |
| 61 | if((pc >= mi->start) && (pc < mi->end)){ |
| 62 | return mi->name; |
| 63 | } |
| 64 | mi = mi->next; |
| 65 | } |
| 66 | return def; |
| 67 | } |
| 68 | |
| 69 | /* Find the containing map info for the pc */ |
| 70 | const mapinfo *pc_to_mapinfo(mapinfo *mi, unsigned pc, unsigned *rel_pc) |
| 71 | { |
| 72 | while(mi) { |
| 73 | if((pc >= mi->start) && (pc < mi->end)){ |
| 74 | // Only calculate the relative offset for shared libraries |
| 75 | if (strstr(mi->name, ".so")) { |
| 76 | *rel_pc = pc - mi->start; |
| 77 | } |
| 78 | return mi; |
| 79 | } |
| 80 | mi = mi->next; |
| 81 | } |
| 82 | return NULL; |
| 83 | } |