1231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman/* system/debuggerd/debuggerd.c 2231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** 3231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** Copyright 2012, The Android Open Source Project 4231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** 5231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** Licensed under the Apache License, Version 2.0 (the "License"); 6231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** you may not use this file except in compliance with the License. 7231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** You may obtain a copy of the License at 8231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** 9231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** http://www.apache.org/licenses/LICENSE-2.0 10231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** 11231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** Unless required by applicable law or agreed to in writing, software 12231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** distributed under the License is distributed on an "AS IS" BASIS, 13231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** See the License for the specific language governing permissions and 15231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman** limitations under the License. 16231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman*/ 17231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 18231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <stddef.h> 19231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <stdbool.h> 20231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <stdlib.h> 21231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <string.h> 22231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <stdio.h> 23231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <errno.h> 24231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <sys/types.h> 25231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <sys/ptrace.h> 26231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 27231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <corkscrew/ptrace.h> 28231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 29231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include <linux/user.h> 30231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 31231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include "../utility.h" 32231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#include "../machine.h" 33231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 34231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman/* enable to dump memory pointed to by every register */ 35231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#define DUMP_MEMORY_FOR_ALL_REGISTERS 1 36231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 37231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman#define R(x) ((unsigned int)(x)) 38231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 39231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearmanstatic void dump_memory(log_t* log, pid_t tid, uintptr_t addr, bool at_fault) { 40231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */ 41231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman char ascii_buffer[32]; /* actual 16 + 1 == 17 */ 42231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman uintptr_t p, end; 43231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 44231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman p = addr & ~3; 45231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman p -= 32; 46231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (p > addr) { 47231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* catch underflow */ 48231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman p = 0; 49231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 50231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman end = p + 80; 51231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* catch overflow; 'end - p' has to be multiples of 16 */ 52231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman while (end < p) 53231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman end -= 16; 54231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 55231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* Dump the code around PC as: 56231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * addr contents ascii 57231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q 58231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... 59231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman */ 60231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman while (p < end) { 61231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman char* asc_out = ascii_buffer; 62231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 63231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman sprintf(code_buffer, "%08x ", p); 64231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 65231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman int i; 66231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman for (i = 0; i < 4; i++) { 67231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* 68231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * If we see (data == -1 && errno != 0), we know that the ptrace 69231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * call failed, probably because we're dumping memory in an 70231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * unmapped or inaccessible page. I don't know if there's 71231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * value in making that explicit in the output -- it likely 72231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * just complicates parsing and clarifies nothing for the 73231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * enlightened reader. 74231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman */ 75231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL); 76231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); 77231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 78231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman int j; 79231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman for (j = 0; j < 4; j++) { 80231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* 81231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * Our isprint() allows high-ASCII characters that display 82231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * differently (often badly) in different viewers, so we 83231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * just use a simpler test. 84231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman */ 85231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman char val = (data >> (j*8)) & 0xff; 86231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (val >= 0x20 && val < 0x7f) { 87231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman *asc_out++ = val; 88231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } else { 89231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman *asc_out++ = '.'; 90231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 91231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 92231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman p += 4; 93231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 94231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman *asc_out = '\0'; 95231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, !at_fault, " %s %s\n", code_buffer, ascii_buffer); 96231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 97231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman} 98231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 99231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman/* 100231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * If configured to do so, dump memory around *all* registers 101231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * for the crashing thread. 102231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman */ 103231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearmanvoid dump_memory_and_code(const ptrace_context_t* context __attribute((unused)), 104231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman log_t* log, pid_t tid, bool at_fault) { 105231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman pt_regs_mips_t r; 106231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { 107231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman return; 108231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 109231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 110231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) { 111231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman static const char REG_NAMES[] = "$0atv0v1a0a1a2a3t0t1t2t3t4t5t6t7s0s1s2s3s4s5s6s7t8t9k0k1gpsps8ra"; 112231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 113231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman for (int reg = 0; reg < 32; reg++) { 114231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* skip uninteresting registers */ 115231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (reg == 0 /* $0 */ 116231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman || reg == 26 /* $k0 */ 117231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman || reg == 27 /* $k1 */ 118231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman || reg == 31 /* $ra (done below) */ 119231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman ) 120231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman continue; 121231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 122231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman uintptr_t addr = R(r.regs[reg]); 123231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 124231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman /* 125231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * Don't bother if it looks like a small int or ~= null, or if 126231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman * it's in the kernel area. 127231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman */ 128231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (addr < 4096 || addr >= 0x80000000) { 129231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman continue; 130231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 131231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 132231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, false, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); 133231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman dump_memory(log, tid, addr, at_fault); 134231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 135231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 136231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 137231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman unsigned int pc = R(r.cp0_epc); 138231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman unsigned int ra = R(r.regs[31]); 139231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 140231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, !at_fault, "\ncode around pc:\n"); 141231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman dump_memory(log, tid, (uintptr_t)pc, at_fault); 142231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 143231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if (pc != ra) { 144231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, !at_fault, "\ncode around ra:\n"); 145231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman dump_memory(log, tid, (uintptr_t)ra, at_fault); 146231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 147231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman} 148231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 149231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearmanvoid dump_registers(const ptrace_context_t* context __attribute((unused)), 150231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman log_t* log, pid_t tid, bool at_fault) 151231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman{ 152231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman pt_regs_mips_t r; 153231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman bool only_in_tombstone = !at_fault; 154231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 155231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { 156231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno)); 157231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman return; 158231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman } 159231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman 160231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " zr %08x at %08x v0 %08x v1 %08x\n", 161231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[0]), R(r.regs[1]), R(r.regs[2]), R(r.regs[3])); 162231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " a0 %08x a1 %08x a2 %08x a3 %08x\n", 163231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[4]), R(r.regs[5]), R(r.regs[6]), R(r.regs[7])); 164231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " t0 %08x t1 %08x t2 %08x t3 %08x\n", 165231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[8]), R(r.regs[9]), R(r.regs[10]), R(r.regs[11])); 166231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " t4 %08x t5 %08x t6 %08x t7 %08x\n", 167231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[12]), R(r.regs[13]), R(r.regs[14]), R(r.regs[15])); 168231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " s0 %08x s1 %08x s2 %08x s3 %08x\n", 169231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[16]), R(r.regs[17]), R(r.regs[18]), R(r.regs[19])); 170231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " s4 %08x s5 %08x s6 %08x s7 %08x\n", 171231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[20]), R(r.regs[21]), R(r.regs[22]), R(r.regs[23])); 172231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " t8 %08x t9 %08x k0 %08x k1 %08x\n", 173231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[24]), R(r.regs[25]), R(r.regs[26]), R(r.regs[27])); 174231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " gp %08x sp %08x s8 %08x ra %08x\n", 175231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.regs[28]), R(r.regs[29]), R(r.regs[30]), R(r.regs[31])); 176231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman _LOG(log, only_in_tombstone, " hi %08x lo %08x bva %08x epc %08x\n", 177231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman R(r.hi), R(r.lo), R(r.cp0_badvaddr), R(r.cp0_epc)); 178231e3c83a3a70b11160fb0da108ebf2e0e7470e2Chris Dearman} 179