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      1 /*
      2  * Copyright 2012, 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[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra";
     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:", &reg_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 %08" PRIxPTR "  at %08" PRIxPTR
     72        "  v0 %08" PRIxPTR "  v1 %08" 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 %08" PRIxPTR "  a1 %08" PRIxPTR
     75        "  a2 %08" PRIxPTR "  a3 %08" PRIxPTR "\n",
     76        R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7]));
     77   _LOG(log, logtype::REGISTERS, " t0 %08" PRIxPTR "  t1 %08" PRIxPTR
     78        "  t2 %08" PRIxPTR "  t3 %08" PRIxPTR "\n",
     79        R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11]));
     80   _LOG(log, logtype::REGISTERS, " t4 %08" PRIxPTR "  t5 %08" PRIxPTR
     81        "  t6 %08" PRIxPTR "  t7 %08" 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 %08" PRIxPTR "  s1 %08" PRIxPTR
     84        "  s2 %08" PRIxPTR "  s3 %08" 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 %08" PRIxPTR "  s5 %08" PRIxPTR
     87        "  s6 %08" PRIxPTR "  s7 %08" 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 %08" PRIxPTR "  t9 %08" PRIxPTR
     90        "  k0 %08" PRIxPTR "  k1 %08" 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 %08" PRIxPTR "  sp %08" PRIxPTR
     93        "  s8 %08" PRIxPTR "  ra %08" 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 %08" PRIxPTR "  lo %08" PRIxPTR
     96        " bva %08" PRIxPTR " epc %08" PRIxPTR "\n",
     97        R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc));
     98 }
     99