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 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 18 | #include <stddef.h> |
| 19 | #include <stdbool.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 22 | #include <stdio.h> |
| 23 | #include <errno.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 24 | #include <sys/types.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 25 | #include <sys/ptrace.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 26 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 27 | #include <corkscrew/ptrace.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 28 | |
David 'Digit' Turner | 2c25991 | 2011-01-26 15:11:04 +0100 | [diff] [blame] | 29 | #include <linux/user.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 30 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 31 | #include "../utility.h" |
| 32 | #include "../machine.h" |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 33 | |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 34 | /* enable to dump memory pointed to by every register */ |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 35 | #define DUMP_MEMORY_FOR_ALL_REGISTERS 1 |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 36 | |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 37 | #ifdef WITH_VFP |
| 38 | #ifdef WITH_VFP_D32 |
| 39 | #define NUM_VFP_REGS 32 |
| 40 | #else |
| 41 | #define NUM_VFP_REGS 16 |
| 42 | #endif |
| 43 | #endif |
| 44 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 45 | static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, bool at_fault) { |
| 46 | char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */ |
| 47 | char ascii_buffer[32]; /* actual 16 + 1 == 17 */ |
| 48 | uintptr_t p, end; |
| 49 | |
| 50 | p = addr & ~3; |
| 51 | p -= 32; |
| 52 | if (p > addr) { |
| 53 | /* catch underflow */ |
| 54 | p = 0; |
| 55 | } |
| 56 | end = p + 80; |
| 57 | /* catch overflow; 'end - p' has to be multiples of 16 */ |
| 58 | while (end < p) |
| 59 | end -= 16; |
| 60 | |
| 61 | /* Dump the code around PC as: |
| 62 | * addr contents ascii |
| 63 | * 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q |
| 64 | * 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... |
| 65 | */ |
| 66 | while (p < end) { |
| 67 | char* asc_out = ascii_buffer; |
| 68 | |
| 69 | sprintf(code_buffer, "%08x ", p); |
| 70 | |
| 71 | int i; |
| 72 | for (i = 0; i < 4; i++) { |
| 73 | /* |
| 74 | * If we see (data == -1 && errno != 0), we know that the ptrace |
| 75 | * call failed, probably because we're dumping memory in an |
| 76 | * unmapped or inaccessible page. I don't know if there's |
| 77 | * value in making that explicit in the output -- it likely |
| 78 | * just complicates parsing and clarifies nothing for the |
| 79 | * enlightened reader. |
| 80 | */ |
| 81 | long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL); |
| 82 | sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); |
| 83 | |
| 84 | int j; |
| 85 | for (j = 0; j < 4; j++) { |
| 86 | /* |
| 87 | * Our isprint() allows high-ASCII characters that display |
| 88 | * differently (often badly) in different viewers, so we |
| 89 | * just use a simpler test. |
| 90 | */ |
| 91 | char val = (data >> (j*8)) & 0xff; |
| 92 | if (val >= 0x20 && val < 0x7f) { |
| 93 | *asc_out++ = val; |
| 94 | } else { |
| 95 | *asc_out++ = '.'; |
| 96 | } |
| 97 | } |
| 98 | p += 4; |
| 99 | } |
| 100 | *asc_out = '\0'; |
| 101 | _LOG(log, !at_fault, " %s %s\n", code_buffer, ascii_buffer); |
| 102 | } |
| 103 | } |
| 104 | |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 105 | /* |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 106 | * If configured to do so, dump memory around *all* registers |
| 107 | * for the crashing thread. |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 108 | */ |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 109 | void dump_memory_and_code(const ptrace_context_t* context __attribute((unused)), |
| 110 | log_t* log, pid_t tid, bool at_fault) { |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 111 | struct pt_regs regs; |
| 112 | if(ptrace(PTRACE_GETREGS, tid, 0, ®s)) { |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 113 | return; |
| 114 | } |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 115 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 116 | if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) { |
| 117 | static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp"; |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 118 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 119 | for (int reg = 0; reg < 14; reg++) { |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 120 | /* this may not be a valid way to access, but it'll do for now */ |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 121 | uintptr_t addr = regs.uregs[reg]; |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 122 | |
| 123 | /* |
| 124 | * Don't bother if it looks like a small int or ~= null, or if |
| 125 | * it's in the kernel area. |
| 126 | */ |
| 127 | if (addr < 4096 || addr >= 0xc0000000) { |
| 128 | continue; |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 129 | } |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 130 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 131 | _LOG(log, false, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); |
| 132 | dump_memory(log, tid, addr, at_fault); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 133 | } |
| 134 | } |
| 135 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 136 | _LOG(log, !at_fault, "\ncode around pc:\n"); |
| 137 | dump_memory(log, tid, (uintptr_t)regs.ARM_pc, at_fault); |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 138 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 139 | if (regs.ARM_pc != regs.ARM_lr) { |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 140 | _LOG(log, !at_fault, "\ncode around lr:\n"); |
| 141 | dump_memory(log, tid, (uintptr_t)regs.ARM_lr, at_fault); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 142 | } |
| 143 | } |
| 144 | |
Jeff Brown | f0c5872 | 2011-11-03 17:58:44 -0700 | [diff] [blame] | 145 | void dump_registers(const ptrace_context_t* context __attribute((unused)), |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 146 | log_t* log, pid_t tid, bool at_fault) |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 147 | { |
| 148 | struct pt_regs r; |
| 149 | bool only_in_tombstone = !at_fault; |
| 150 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 151 | if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 152 | _LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno)); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 153 | return; |
| 154 | } |
| 155 | |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 156 | _LOG(log, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n", |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 157 | (uint32_t)r.ARM_r0, (uint32_t)r.ARM_r1, (uint32_t)r.ARM_r2, (uint32_t)r.ARM_r3); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 158 | _LOG(log, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n", |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 159 | (uint32_t)r.ARM_r4, (uint32_t)r.ARM_r5, (uint32_t)r.ARM_r6, (uint32_t)r.ARM_r7); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 160 | _LOG(log, only_in_tombstone, " r8 %08x r9 %08x sl %08x fp %08x\n", |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 161 | (uint32_t)r.ARM_r8, (uint32_t)r.ARM_r9, (uint32_t)r.ARM_r10, (uint32_t)r.ARM_fp); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 162 | _LOG(log, only_in_tombstone, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 163 | (uint32_t)r.ARM_ip, (uint32_t)r.ARM_sp, (uint32_t)r.ARM_lr, |
| 164 | (uint32_t)r.ARM_pc, (uint32_t)r.ARM_cpsr); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 165 | |
| 166 | #ifdef WITH_VFP |
| 167 | struct user_vfp vfp_regs; |
| 168 | int i; |
| 169 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 170 | if(ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) { |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 171 | _LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno)); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 172 | return; |
| 173 | } |
| 174 | |
| 175 | for (i = 0; i < NUM_VFP_REGS; i += 2) { |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 176 | _LOG(log, only_in_tombstone, " d%-2d %016llx d%-2d %016llx\n", |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 177 | i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 178 | } |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame^] | 179 | _LOG(log, only_in_tombstone, " scr %08lx\n", vfp_regs.fpscr); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 180 | #endif |
| 181 | } |