Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame^] | 1 | /* system/debuggerd/debuggerd.c |
| 2 | ** |
| 3 | ** Copyright 2006, 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 <stdio.h> |
| 19 | #include <errno.h> |
| 20 | #include <signal.h> |
| 21 | #include <pthread.h> |
| 22 | #include <fcntl.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <dirent.h> |
| 25 | |
| 26 | #include <sys/ptrace.h> |
| 27 | #include <sys/wait.h> |
| 28 | #include <sys/exec_elf.h> |
| 29 | #include <sys/stat.h> |
| 30 | |
| 31 | #include <cutils/sockets.h> |
| 32 | #include <cutils/properties.h> |
| 33 | |
| 34 | #include <linux/input.h> |
| 35 | |
| 36 | #include "utility.h" |
| 37 | |
| 38 | #ifdef WITH_VFP |
| 39 | #ifdef WITH_VFP_D32 |
| 40 | #define NUM_VFP_REGS 32 |
| 41 | #else |
| 42 | #define NUM_VFP_REGS 16 |
| 43 | #endif |
| 44 | #endif |
| 45 | |
| 46 | /* Main entry point to get the backtrace from the crashing process */ |
| 47 | extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map, |
| 48 | unsigned int sp_list[], |
| 49 | int *frame0_pc_sane, |
| 50 | bool at_fault); |
| 51 | |
| 52 | void dump_stack_and_code(int tfd, int pid, mapinfo *map, |
| 53 | int unwind_depth, unsigned int sp_list[], |
| 54 | bool at_fault) |
| 55 | { |
| 56 | unsigned int sp, pc, p, end, data; |
| 57 | struct pt_regs r; |
| 58 | int sp_depth; |
| 59 | bool only_in_tombstone = !at_fault; |
| 60 | char code_buffer[80]; |
| 61 | |
| 62 | if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return; |
| 63 | sp = r.ARM_sp; |
| 64 | pc = r.ARM_pc; |
| 65 | |
| 66 | _LOG(tfd, only_in_tombstone, "\ncode around pc:\n"); |
| 67 | |
| 68 | end = p = pc & ~3; |
| 69 | p -= 32; |
| 70 | end += 32; |
| 71 | |
| 72 | /* Dump the code around PC as: |
| 73 | * addr contents |
| 74 | * 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c |
| 75 | * 00008d44 f7ff18a0 490ced94 68035860 d0012b00 |
| 76 | */ |
| 77 | while (p <= end) { |
| 78 | int i; |
| 79 | |
| 80 | sprintf(code_buffer, "%08x ", p); |
| 81 | for (i = 0; i < 4; i++) { |
| 82 | data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL); |
| 83 | sprintf(code_buffer + strlen(code_buffer), "%08x ", data); |
| 84 | p += 4; |
| 85 | } |
| 86 | _LOG(tfd, only_in_tombstone, "%s\n", code_buffer); |
| 87 | } |
| 88 | |
| 89 | if ((unsigned) r.ARM_lr != pc) { |
| 90 | _LOG(tfd, only_in_tombstone, "\ncode around lr:\n"); |
| 91 | |
| 92 | end = p = r.ARM_lr & ~3; |
| 93 | p -= 32; |
| 94 | end += 32; |
| 95 | |
| 96 | /* Dump the code around LR as: |
| 97 | * addr contents |
| 98 | * 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c |
| 99 | * 00008d44 f7ff18a0 490ced94 68035860 d0012b00 |
| 100 | */ |
| 101 | while (p <= end) { |
| 102 | int i; |
| 103 | |
| 104 | sprintf(code_buffer, "%08x ", p); |
| 105 | for (i = 0; i < 4; i++) { |
| 106 | data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL); |
| 107 | sprintf(code_buffer + strlen(code_buffer), "%08x ", data); |
| 108 | p += 4; |
| 109 | } |
| 110 | _LOG(tfd, only_in_tombstone, "%s\n", code_buffer); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | p = sp - 64; |
| 115 | p &= ~3; |
| 116 | if (unwind_depth != 0) { |
| 117 | if (unwind_depth < STACK_CONTENT_DEPTH) { |
| 118 | end = sp_list[unwind_depth-1]; |
| 119 | } |
| 120 | else { |
| 121 | end = sp_list[STACK_CONTENT_DEPTH-1]; |
| 122 | } |
| 123 | } |
| 124 | else { |
| 125 | end = sp | 0x000000ff; |
| 126 | end += 0xff; |
| 127 | } |
| 128 | |
| 129 | _LOG(tfd, only_in_tombstone, "\nstack:\n"); |
| 130 | |
| 131 | /* If the crash is due to PC == 0, there will be two frames that |
| 132 | * have identical SP value. |
| 133 | */ |
| 134 | if (sp_list[0] == sp_list[1]) { |
| 135 | sp_depth = 1; |
| 136 | } |
| 137 | else { |
| 138 | sp_depth = 0; |
| 139 | } |
| 140 | |
| 141 | while (p <= end) { |
| 142 | char *prompt; |
| 143 | char level[16]; |
| 144 | data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL); |
| 145 | if (p == sp_list[sp_depth]) { |
| 146 | sprintf(level, "#%02d", sp_depth++); |
| 147 | prompt = level; |
| 148 | } |
| 149 | else { |
| 150 | prompt = " "; |
| 151 | } |
| 152 | |
| 153 | /* Print the stack content in the log for the first 3 frames. For the |
| 154 | * rest only print them in the tombstone file. |
| 155 | */ |
| 156 | _LOG(tfd, (sp_depth > 2) || only_in_tombstone, |
| 157 | "%s %08x %08x %s\n", prompt, p, data, |
| 158 | map_to_name(map, data, "")); |
| 159 | p += 4; |
| 160 | } |
| 161 | /* print another 64-byte of stack data after the last frame */ |
| 162 | |
| 163 | end = p+64; |
| 164 | while (p <= end) { |
| 165 | data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL); |
| 166 | _LOG(tfd, (sp_depth > 2) || only_in_tombstone, |
| 167 | " %08x %08x %s\n", p, data, |
| 168 | map_to_name(map, data, "")); |
| 169 | p += 4; |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level, |
| 174 | bool at_fault) |
| 175 | { |
| 176 | struct pt_regs r; |
| 177 | |
| 178 | if(ptrace(PTRACE_GETREGS, pid, 0, &r)) { |
| 179 | _LOG(tfd, !at_fault, "tid %d not responding!\n", pid); |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | if (unwound_level == 0) { |
| 184 | _LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc, |
| 185 | map_to_name(map, r.ARM_pc, "<unknown>")); |
| 186 | } |
| 187 | _LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr, |
| 188 | map_to_name(map, r.ARM_lr, "<unknown>")); |
| 189 | } |
| 190 | |
| 191 | void dump_registers(int tfd, int pid, bool at_fault) |
| 192 | { |
| 193 | struct pt_regs r; |
| 194 | bool only_in_tombstone = !at_fault; |
| 195 | |
| 196 | if(ptrace(PTRACE_GETREGS, pid, 0, &r)) { |
| 197 | _LOG(tfd, only_in_tombstone, |
| 198 | "cannot get registers: %s\n", strerror(errno)); |
| 199 | return; |
| 200 | } |
| 201 | |
| 202 | _LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n", |
| 203 | r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3); |
| 204 | _LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n", |
| 205 | r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7); |
| 206 | _LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n", |
| 207 | r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp); |
| 208 | _LOG(tfd, only_in_tombstone, |
| 209 | " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", |
| 210 | r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr); |
| 211 | |
| 212 | #ifdef WITH_VFP |
| 213 | struct user_vfp vfp_regs; |
| 214 | int i; |
| 215 | |
| 216 | if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) { |
| 217 | _LOG(tfd, only_in_tombstone, |
| 218 | "cannot get registers: %s\n", strerror(errno)); |
| 219 | return; |
| 220 | } |
| 221 | |
| 222 | for (i = 0; i < NUM_VFP_REGS; i += 2) { |
| 223 | _LOG(tfd, only_in_tombstone, |
| 224 | " d%-2d %016llx d%-2d %016llx\n", |
| 225 | i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]); |
| 226 | } |
| 227 | _LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr); |
| 228 | #endif |
| 229 | } |