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 } 84
