1 /* 2 * Copyright 2014, The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #define LOG_TAG "DEBUG" 18 19 #include <errno.h> 20 #include <inttypes.h> 21 #include <stdint.h> 22 #include <string.h> 23 #include <sys/ptrace.h> 24 25 #include <backtrace/Backtrace.h> 26 #include <log/log.h> 27 28 #include "machine.h" 29 #include "utility.h" 30 31 #define R(x) (static_cast<uintptr_t>(x)) 32 33 // If configured to do so, dump memory around *all* registers 34 // for the crashing thread. 35 void dump_memory_and_code(log_t* log, Backtrace* backtrace) { 36 pt_regs r; 37 if (ptrace(PTRACE_GETREGS, backtrace->Tid(), 0, &r)) { 38 ALOGE("cannot get registers: %s\n", strerror(errno)); 39 return; 40 } 41 42 static const char reg_names[] = "$0atv0v1a0a1a2a3a4a5a6a7t0t1t2t3s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra"; 43 44 for (int reg = 0; reg < 32; reg++) { 45 // skip uninteresting registers 46 if (reg == 0 // $0 47 || reg == 26 // $k0 48 || reg == 27 // $k1 49 || reg == 31 // $ra (done below) 50 ) 51 continue; 52 53 dump_memory(log, backtrace, R(r.regs[reg]), "memory near %.2s:", ®_names[reg * 2]); 54 } 55 56 uintptr_t pc = R(r.cp0_epc); 57 uintptr_t ra = R(r.regs[31]); 58 dump_memory(log, backtrace, pc, "code around pc:"); 59 if (pc != ra) { 60 dump_memory(log, backtrace, ra, "code around ra:"); 61 } 62 } 63 64 void dump_registers(log_t* log, pid_t tid) { 65 pt_regs r; 66 if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { 67 ALOGE("cannot get registers: %s\n", strerror(errno)); 68 return; 69 } 70 71 _LOG(log, logtype::REGISTERS, " zr %016" PRIxPTR " at %016" PRIxPTR 72 " v0 %016" PRIxPTR " v1 %016" PRIxPTR "\n", 73 R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3])); 74 _LOG(log, logtype::REGISTERS, " a0 %016" PRIxPTR " a1 %016" PRIxPTR 75 " a2 %016" PRIxPTR " a3 %016" PRIxPTR "\n", 76 R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7])); 77 _LOG(log, logtype::REGISTERS, " a4 %016" PRIxPTR " a5 %016" PRIxPTR 78 " a6 %016" PRIxPTR " a7 %016" PRIxPTR "\n", 79 R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11])); 80 _LOG(log, logtype::REGISTERS, " t0 %016" PRIxPTR " t1 %016" PRIxPTR 81 " t2 %016" PRIxPTR " t3 %016" PRIxPTR "\n", 82 R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15])); 83 _LOG(log, logtype::REGISTERS, " s0 %016" PRIxPTR " s1 %016" PRIxPTR 84 " s2 %016" PRIxPTR " s3 %016" PRIxPTR "\n", 85 R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19])); 86 _LOG(log, logtype::REGISTERS, " s4 %016" PRIxPTR " s5 %016" PRIxPTR 87 " s6 %016" PRIxPTR " s7 %016" PRIxPTR "\n", 88 R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23])); 89 _LOG(log, logtype::REGISTERS, " t8 %016" PRIxPTR " t9 %016" PRIxPTR 90 " k0 %016" PRIxPTR " k1 %016" PRIxPTR "\n", 91 R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27])); 92 _LOG(log, logtype::REGISTERS, " gp %016" PRIxPTR " sp %016" PRIxPTR 93 " s8 %016" PRIxPTR " ra %016" PRIxPTR "\n", 94 R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31])); 95 _LOG(log, logtype::REGISTERS, " hi %016" PRIxPTR " lo %016" PRIxPTR 96 " bva %016" PRIxPTR " epc %016" PRIxPTR "\n", 97 R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc)); 98 } 99
