| /* |
| * Copyright 2012, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/ptrace.h> |
| |
| #include <sys/user.h> |
| |
| #include "../utility.h" |
| #include "../machine.h" |
| |
| #define R(x) (static_cast<unsigned int>(x)) |
| |
| // The MIPS uapi ptrace.h has the wrong definition for pt_regs. PTRACE_GETREGS |
| // writes 64-bit quantities even though the public struct uses 32-bit ones. |
| struct pt_regs_mips_t { |
| uint64_t regs[32]; |
| uint64_t lo; |
| uint64_t hi; |
| uint64_t cp0_epc; |
| uint64_t cp0_badvaddr; |
| uint64_t cp0_status; |
| uint64_t cp0_cause; |
| }; |
| |
| // If configured to do so, dump memory around *all* registers |
| // for the crashing thread. |
| void dump_memory_and_code(log_t* log, pid_t tid) { |
| pt_regs_mips_t r; |
| if (ptrace(PTRACE_GETREGS, tid, 0, &r)) { |
| return; |
| } |
| |
| static const char REG_NAMES[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra"; |
| |
| for (int reg = 0; reg < 32; reg++) { |
| // skip uninteresting registers |
| if (reg == 0 // $0 |
| || reg == 26 // $k0 |
| || reg == 27 // $k1 |
| || reg == 31 // $ra (done below) |
| ) |
| continue; |
| |
| uintptr_t addr = R(r.regs[reg]); |
| |
| // Don't bother if it looks like a small int or ~= null, or if |
| // it's in the kernel area. |
| if (addr < 4096 || addr >= 0x80000000) { |
| continue; |
| } |
| |
| _LOG(log, logtype::MEMORY, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); |
| dump_memory(log, tid, addr); |
| } |
| |
| unsigned int pc = R(r.cp0_epc); |
| unsigned int ra = R(r.regs[31]); |
| |
| _LOG(log, logtype::MEMORY, "\ncode around pc:\n"); |
| dump_memory(log, tid, (uintptr_t)pc); |
| |
| if (pc != ra) { |
| _LOG(log, logtype::MEMORY, "\ncode around ra:\n"); |
| dump_memory(log, tid, (uintptr_t)ra); |
| } |
| } |
| |
| void dump_registers(log_t* log, pid_t tid) { |
| pt_regs_mips_t r; |
| if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { |
| LOG_ERROR("cannot get registers: %s\n", strerror(errno)); |
| return; |
| } |
| |
| _LOG(log, logtype::REGISTERS, " zr %08x at %08x v0 %08x v1 %08x\n", |
| R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3])); |
| _LOG(log, logtype::REGISTERS, " a0 %08x a1 %08x a2 %08x a3 %08x\n", |
| R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7])); |
| _LOG(log, logtype::REGISTERS, " t0 %08x t1 %08x t2 %08x t3 %08x\n", |
| R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11])); |
| _LOG(log, logtype::REGISTERS, " t4 %08x t5 %08x t6 %08x t7 %08x\n", |
| R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15])); |
| _LOG(log, logtype::REGISTERS, " s0 %08x s1 %08x s2 %08x s3 %08x\n", |
| R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19])); |
| _LOG(log, logtype::REGISTERS, " s4 %08x s5 %08x s6 %08x s7 %08x\n", |
| R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23])); |
| _LOG(log, logtype::REGISTERS, " t8 %08x t9 %08x k0 %08x k1 %08x\n", |
| R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27])); |
| _LOG(log, logtype::REGISTERS, " gp %08x sp %08x s8 %08x ra %08x\n", |
| R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31])); |
| _LOG(log, logtype::REGISTERS, " hi %08x lo %08x bva %08x epc %08x\n", |
| R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc)); |
| } |