Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 1 | /* |
| 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 | */ |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 17 | |
Elliott Hughes | 9e7d218 | 2013-11-26 18:01:29 -0800 | [diff] [blame] | 18 | #include <errno.h> |
Elliott Hughes | 9e7d218 | 2013-11-26 18:01:29 -0800 | [diff] [blame] | 19 | #include <stddef.h> |
| 20 | #include <stdio.h> |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 23 | #include <sys/ptrace.h> |
Elliott Hughes | 9e7d218 | 2013-11-26 18:01:29 -0800 | [diff] [blame] | 24 | #include <sys/types.h> |
| 25 | #include <sys/user.h> |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 26 | |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 27 | #include "../utility.h" |
| 28 | #include "../machine.h" |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 29 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 30 | // enable to dump memory pointed to by every register |
Jeff Brown | 13e715b | 2011-10-21 12:14:56 -0700 | [diff] [blame] | 31 | #define DUMP_MEMORY_FOR_ALL_REGISTERS 1 |
Andy McFadden | f2eae5a | 2011-10-18 15:42:03 -0700 | [diff] [blame] | 32 | |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 33 | #ifdef WITH_VFP |
| 34 | #ifdef WITH_VFP_D32 |
| 35 | #define NUM_VFP_REGS 32 |
| 36 | #else |
| 37 | #define NUM_VFP_REGS 16 |
| 38 | #endif |
| 39 | #endif |
| 40 | |
Christopher Ferris | 365e4ae | 2013-10-02 12:26:48 -0700 | [diff] [blame] | 41 | static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, int scope_flags) { |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 42 | char code_buffer[64]; // actual 8+1+((8+1)*4) + 1 == 45 |
| 43 | char ascii_buffer[32]; // actual 16 + 1 == 17 |
| 44 | uintptr_t p, end; |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 45 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 46 | p = addr & ~3; |
| 47 | p -= 32; |
| 48 | if (p > addr) { |
| 49 | // catch underflow |
| 50 | p = 0; |
| 51 | } |
| 52 | // Dump more memory content for the crashing thread. |
| 53 | end = p + 256; |
| 54 | // catch overflow; 'end - p' has to be multiples of 16 |
| 55 | while (end < p) |
| 56 | end -= 16; |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 57 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 58 | // Dump the code around PC as: |
| 59 | // addr contents ascii |
| 60 | // 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q |
| 61 | // 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... |
| 62 | while (p < end) { |
| 63 | char* asc_out = ascii_buffer; |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 64 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 65 | sprintf(code_buffer, "%08x ", p); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 66 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 67 | int i; |
| 68 | for (i = 0; i < 4; i++) { |
| 69 | // If we see (data == -1 && errno != 0), we know that the ptrace |
| 70 | // call failed, probably because we're dumping memory in an |
| 71 | // unmapped or inaccessible page. I don't know if there's |
| 72 | // value in making that explicit in the output -- it likely |
| 73 | // just complicates parsing and clarifies nothing for the |
| 74 | // enlightened reader. |
| 75 | long data = ptrace(PTRACE_PEEKTEXT, tid, reinterpret_cast<void*>(p), NULL); |
| 76 | sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 77 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 78 | // Enable the following code blob to dump ASCII values |
Ben Cheng | c47b772 | 2012-09-24 14:13:37 -0700 | [diff] [blame] | 79 | #if 0 |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 80 | int j; |
| 81 | for (j = 0; j < 4; j++) { |
| 82 | // Our isprint() allows high-ASCII characters that display |
| 83 | // differently (often badly) in different viewers, so we |
| 84 | // just use a simpler test. |
| 85 | char val = (data >> (j*8)) & 0xff; |
| 86 | if (val >= 0x20 && val < 0x7f) { |
| 87 | *asc_out++ = val; |
| 88 | } else { |
| 89 | *asc_out++ = '.'; |
| 90 | } |
| 91 | } |
Ben Cheng | c47b772 | 2012-09-24 14:13:37 -0700 | [diff] [blame] | 92 | #endif |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 93 | p += 4; |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 94 | } |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 95 | *asc_out = '\0'; |
| 96 | _LOG(log, scope_flags, " %s %s\n", code_buffer, ascii_buffer); |
| 97 | } |
Jeff Brown | 053b865 | 2012-06-06 16:25:03 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 100 | // If configured to do so, dump memory around *all* registers |
| 101 | // for the crashing thread. |
Christopher Ferris | 365e4ae | 2013-10-02 12:26:48 -0700 | [diff] [blame] | 102 | void dump_memory_and_code(log_t* log, pid_t tid, int scope_flags) { |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 103 | struct pt_regs regs; |
| 104 | if (ptrace(PTRACE_GETREGS, tid, 0, ®s)) { |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | if (IS_AT_FAULT(scope_flags) && DUMP_MEMORY_FOR_ALL_REGISTERS) { |
| 109 | static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp"; |
| 110 | |
| 111 | for (int reg = 0; reg < 14; reg++) { |
| 112 | // this may not be a valid way to access, but it'll do for now |
| 113 | uintptr_t addr = regs.uregs[reg]; |
| 114 | |
| 115 | // Don't bother if it looks like a small int or ~= null, or if |
| 116 | // it's in the kernel area. |
| 117 | if (addr < 4096 || addr >= 0xc0000000) { |
| 118 | continue; |
| 119 | } |
| 120 | |
| 121 | _LOG(log, scope_flags | SCOPE_SENSITIVE, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); |
| 122 | dump_memory(log, tid, addr, scope_flags | SCOPE_SENSITIVE); |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 123 | } |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 124 | } |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 125 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 126 | // explicitly allow upload of code dump logging |
| 127 | _LOG(log, scope_flags, "\ncode around pc:\n"); |
| 128 | dump_memory(log, tid, static_cast<uintptr_t>(regs.ARM_pc), scope_flags); |
Andy McFadden | 136dcc5 | 2011-09-22 16:37:06 -0700 | [diff] [blame] | 129 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 130 | if (regs.ARM_pc != regs.ARM_lr) { |
| 131 | _LOG(log, scope_flags, "\ncode around lr:\n"); |
| 132 | dump_memory(log, tid, static_cast<uintptr_t>(regs.ARM_lr), scope_flags); |
| 133 | } |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 134 | } |
| 135 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 136 | void dump_registers(log_t* log, pid_t tid, int scope_flags) { |
| 137 | struct pt_regs r; |
| 138 | if (ptrace(PTRACE_GETREGS, tid, 0, &r)) { |
| 139 | _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno)); |
| 140 | return; |
| 141 | } |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 142 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 143 | _LOG(log, scope_flags, " r0 %08x r1 %08x r2 %08x r3 %08x\n", |
| 144 | static_cast<uint32_t>(r.ARM_r0), static_cast<uint32_t>(r.ARM_r1), |
| 145 | static_cast<uint32_t>(r.ARM_r2), static_cast<uint32_t>(r.ARM_r3)); |
| 146 | _LOG(log, scope_flags, " r4 %08x r5 %08x r6 %08x r7 %08x\n", |
| 147 | static_cast<uint32_t>(r.ARM_r4), static_cast<uint32_t>(r.ARM_r5), |
| 148 | static_cast<uint32_t>(r.ARM_r6), static_cast<uint32_t>(r.ARM_r7)); |
| 149 | _LOG(log, scope_flags, " r8 %08x r9 %08x sl %08x fp %08x\n", |
| 150 | static_cast<uint32_t>(r.ARM_r8), static_cast<uint32_t>(r.ARM_r9), |
| 151 | static_cast<uint32_t>(r.ARM_r10), static_cast<uint32_t>(r.ARM_fp)); |
| 152 | _LOG(log, scope_flags, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", |
| 153 | static_cast<uint32_t>(r.ARM_ip), static_cast<uint32_t>(r.ARM_sp), |
| 154 | static_cast<uint32_t>(r.ARM_lr), static_cast<uint32_t>(r.ARM_pc), |
| 155 | static_cast<uint32_t>(r.ARM_cpsr)); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 156 | |
| 157 | #ifdef WITH_VFP |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 158 | struct user_vfp vfp_regs; |
| 159 | int i; |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 160 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 161 | if (ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) { |
| 162 | _LOG(log, scope_flags, "cannot get registers: %s\n", strerror(errno)); |
| 163 | return; |
| 164 | } |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 165 | |
Christopher Ferris | 20303f8 | 2014-01-10 16:33:16 -0800 | [diff] [blame] | 166 | for (i = 0; i < NUM_VFP_REGS; i += 2) { |
| 167 | _LOG(log, scope_flags, " d%-2d %016llx d%-2d %016llx\n", |
| 168 | i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]); |
| 169 | } |
| 170 | _LOG(log, scope_flags, " scr %08lx\n", vfp_regs.fpscr); |
Bruce Beare | 8492490 | 2010-10-13 14:21:30 -0700 | [diff] [blame] | 171 | #endif |
| 172 | } |