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.
35void 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:", &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
64void 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