machine.cpp revision 62ba489ba00a2689d4e257bc178cff87495f99d7 
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 */
17
18#include <errno.h>
19#include <stddef.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <sys/ptrace.h>
24#include <sys/types.h>
25#include <sys/user.h>
26
27#include "../utility.h"
28#include "../machine.h"
29
30// enable to dump memory pointed to by every register
31#define DUMP_MEMORY_FOR_ALL_REGISTERS 1
32
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
41// If configured to do so, dump memory around *all* registers
42// for the crashing thread.
43void dump_memory_and_code(log_t* log, pid_t tid) {
44  struct pt_regs regs;
45  if (ptrace(PTRACE_GETREGS, tid, 0, &regs)) {
46    return;
47  }
48
49  static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp";
50
51  for (int reg = 0; reg < 14; reg++) {
52    // this may not be a valid way to access, but it'll do for now
53    uintptr_t addr = regs.uregs[reg];
54
55    // Don't bother if it looks like a small int or ~= null, or if
56    // it's in the kernel area.
57    if (addr < 4096 || addr >= 0xc0000000) {
58      continue;
59    }
60
61    _LOG(log, logtype::MEMORY, "\nmemory near %.2s:\n", &REG_NAMES[reg * 2]);
62    dump_memory(log, tid, addr);
63  }
64
65  // explicitly allow upload of code dump logging
66  _LOG(log, logtype::MEMORY, "\ncode around pc:\n");
67  dump_memory(log, tid, static_cast<uintptr_t>(regs.ARM_pc));
68
69  if (regs.ARM_pc != regs.ARM_lr) {
70    _LOG(log, logtype::MEMORY, "\ncode around lr:\n");
71    dump_memory(log, tid, static_cast<uintptr_t>(regs.ARM_lr));
72  }
73}
74
75void dump_registers(log_t* log, pid_t tid) {
76  struct pt_regs r;
77  if (ptrace(PTRACE_GETREGS, tid, 0, &r)) {
78    _LOG(log, logtype::REGISTERS, "cannot get registers: %s\n", strerror(errno));
79    return;
80  }
81
82  _LOG(log, logtype::REGISTERS, "    r0 %08x  r1 %08x  r2 %08x  r3 %08x\n",
83       static_cast<uint32_t>(r.ARM_r0), static_cast<uint32_t>(r.ARM_r1),
84       static_cast<uint32_t>(r.ARM_r2), static_cast<uint32_t>(r.ARM_r3));
85  _LOG(log, logtype::REGISTERS, "    r4 %08x  r5 %08x  r6 %08x  r7 %08x\n",
86       static_cast<uint32_t>(r.ARM_r4), static_cast<uint32_t>(r.ARM_r5),
87       static_cast<uint32_t>(r.ARM_r6), static_cast<uint32_t>(r.ARM_r7));
88  _LOG(log, logtype::REGISTERS, "    r8 %08x  r9 %08x  sl %08x  fp %08x\n",
89       static_cast<uint32_t>(r.ARM_r8), static_cast<uint32_t>(r.ARM_r9),
90       static_cast<uint32_t>(r.ARM_r10), static_cast<uint32_t>(r.ARM_fp));
91  _LOG(log, logtype::REGISTERS, "    ip %08x  sp %08x  lr %08x  pc %08x  cpsr %08x\n",
92       static_cast<uint32_t>(r.ARM_ip), static_cast<uint32_t>(r.ARM_sp),
93       static_cast<uint32_t>(r.ARM_lr), static_cast<uint32_t>(r.ARM_pc),
94       static_cast<uint32_t>(r.ARM_cpsr));
95
96#ifdef WITH_VFP
97  struct user_vfp vfp_regs;
98  int i;
99
100  if (ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) {
101    _LOG(log, logtype::REGISTERS, "cannot get registers: %s\n", strerror(errno));
102    return;
103  }
104
105  for (i = 0; i < NUM_VFP_REGS; i += 2) {
106    _LOG(log, logtype::REGISTERS, "    d%-2d %016llx  d%-2d %016llx\n",
107         i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
108  }
109  _LOG(log, logtype::REGISTERS, "    scr %08lx\n", vfp_regs.fpscr);
110#endif
111}
112