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 #include <stddef.h>
18 #include <stdlib.h>
19 #include <string.h>
20 #include <stdio.h>
21 #include <errno.h>
22 #include <sys/types.h>
23 #include <sys/ptrace.h>
24
25 #include <sys/user.h>
26
27 #include "../utility.h"
28 #include "../machine.h"
29
30 #define R(x) (static_cast<unsigned int>(x))
31
32 // The MIPS uapi ptrace.h has the wrong definition for pt_regs. PTRACE_GETREGS
33 // writes 64-bit quantities even though the public struct uses 32-bit ones.
34 struct pt_regs_mips_t {
35 uint64_t regs[32];
36 uint64_t lo;
37 uint64_t hi;
38 uint64_t cp0_epc;
39 uint64_t cp0_badvaddr;
40 uint64_t cp0_status;
41 uint64_t cp0_cause;
42 };
43
44 // If configured to do so, dump memory around *all* registers
45 // for the crashing thread.
dump_memory_and_code(log_t * log,pid_t tid)46 void dump_memory_and_code(log_t* log, pid_t tid) {
47 pt_regs_mips_t r;
48 if (ptrace(PTRACE_GETREGS, tid, 0, &r)) {
49 return;
50 }
51
52 static const char REG_NAMES[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra";
53
54 for (int reg = 0; reg < 32; reg++) {
55 // skip uninteresting registers
56 if (reg == 0 // $0
57 || reg == 26 // $k0
58 || reg == 27 // $k1
59 || reg == 31 // $ra (done below)
60 )
61 continue;
62
63 uintptr_t addr = R(r.regs[reg]);
64
65 // Don't bother if it looks like a small int or ~= null, or if
66 // it's in the kernel area.
67 if (addr < 4096 || addr >= 0x80000000) {
68 continue;
69 }
70
71 _LOG(log, logtype::MEMORY, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]);
72 dump_memory(log, tid, addr);
73 }
74
75 unsigned int pc = R(r.cp0_epc);
76 unsigned int ra = R(r.regs[31]);
77
78 _LOG(log, logtype::MEMORY, "\ncode around pc:\n");
79 dump_memory(log, tid, (uintptr_t)pc);
80
81 if (pc != ra) {
82 _LOG(log, logtype::MEMORY, "\ncode around ra:\n");
83 dump_memory(log, tid, (uintptr_t)ra);
84 }
85 }
86
dump_registers(log_t * log,pid_t tid)87 void dump_registers(log_t* log, pid_t tid) {
88 pt_regs_mips_t r;
89 if(ptrace(PTRACE_GETREGS, tid, 0, &r)) {
90 _LOG(log, logtype::ERROR, "cannot get registers: %s\n", strerror(errno));
91 return;
92 }
93
94 _LOG(log, logtype::REGISTERS, " zr %08x at %08x v0 %08x v1 %08x\n",
95 R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3]));
96 _LOG(log, logtype::REGISTERS, " a0 %08x a1 %08x a2 %08x a3 %08x\n",
97 R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7]));
98 _LOG(log, logtype::REGISTERS, " t0 %08x t1 %08x t2 %08x t3 %08x\n",
99 R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11]));
100 _LOG(log, logtype::REGISTERS, " t4 %08x t5 %08x t6 %08x t7 %08x\n",
101 R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15]));
102 _LOG(log, logtype::REGISTERS, " s0 %08x s1 %08x s2 %08x s3 %08x\n",
103 R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19]));
104 _LOG(log, logtype::REGISTERS, " s4 %08x s5 %08x s6 %08x s7 %08x\n",
105 R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23]));
106 _LOG(log, logtype::REGISTERS, " t8 %08x t9 %08x k0 %08x k1 %08x\n",
107 R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27]));
108 _LOG(log, logtype::REGISTERS, " gp %08x sp %08x s8 %08x ra %08x\n",
109 R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31]));
110 _LOG(log, logtype::REGISTERS, " hi %08x lo %08x bva %08x epc %08x\n",
111 R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc));
112 }
113