| /* system/debuggerd/debuggerd.c |
| ** |
| ** Copyright 2006, 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 <stdbool.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <sys/types.h> |
| #include <sys/ptrace.h> |
| |
| #include <corkscrew/ptrace.h> |
| |
| #include <linux/user.h> |
| |
| #include "../utility.h" |
| #include "../machine.h" |
| |
| /* enable to dump memory pointed to by every register */ |
| #define DUMP_MEMORY_FOR_ALL_REGISTERS 1 |
| |
| #ifdef WITH_VFP |
| #ifdef WITH_VFP_D32 |
| #define NUM_VFP_REGS 32 |
| #else |
| #define NUM_VFP_REGS 16 |
| #endif |
| #endif |
| |
| static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, int scopeFlags) { |
| char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */ |
| char ascii_buffer[32]; /* actual 16 + 1 == 17 */ |
| uintptr_t p, end; |
| |
| p = addr & ~3; |
| p -= 32; |
| if (p > addr) { |
| /* catch underflow */ |
| p = 0; |
| } |
| /* Dump more memory content for the crashing thread. */ |
| end = p + 256; |
| /* catch overflow; 'end - p' has to be multiples of 16 */ |
| while (end < p) |
| end -= 16; |
| |
| /* Dump the code around PC as: |
| * addr contents ascii |
| * 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q |
| * 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... |
| */ |
| while (p < end) { |
| char* asc_out = ascii_buffer; |
| |
| sprintf(code_buffer, "%08x ", p); |
| |
| int i; |
| for (i = 0; i < 4; i++) { |
| /* |
| * If we see (data == -1 && errno != 0), we know that the ptrace |
| * call failed, probably because we're dumping memory in an |
| * unmapped or inaccessible page. I don't know if there's |
| * value in making that explicit in the output -- it likely |
| * just complicates parsing and clarifies nothing for the |
| * enlightened reader. |
| */ |
| long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL); |
| sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); |
| |
| /* Enable the following code blob to dump ASCII values */ |
| #if 0 |
| int j; |
| for (j = 0; j < 4; j++) { |
| /* |
| * Our isprint() allows high-ASCII characters that display |
| * differently (often badly) in different viewers, so we |
| * just use a simpler test. |
| */ |
| char val = (data >> (j*8)) & 0xff; |
| if (val >= 0x20 && val < 0x7f) { |
| *asc_out++ = val; |
| } else { |
| *asc_out++ = '.'; |
| } |
| } |
| #endif |
| p += 4; |
| } |
| *asc_out = '\0'; |
| _LOG(log, scopeFlags, " %s %s\n", code_buffer, ascii_buffer); |
| } |
| } |
| |
| /* |
| * If configured to do so, dump memory around *all* registers |
| * for the crashing thread. |
| */ |
| void dump_memory_and_code(const ptrace_context_t* context __attribute((unused)), |
| log_t* log, pid_t tid, bool at_fault) { |
| struct pt_regs regs; |
| if(ptrace(PTRACE_GETREGS, tid, 0, ®s)) { |
| return; |
| } |
| |
| int scopeFlags = at_fault ? SCOPE_AT_FAULT : 0; |
| |
| if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) { |
| static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp"; |
| |
| for (int reg = 0; reg < 14; reg++) { |
| /* this may not be a valid way to access, but it'll do for now */ |
| uintptr_t addr = regs.uregs[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 >= 0xc0000000) { |
| continue; |
| } |
| |
| _LOG(log, scopeFlags | SCOPE_SENSITIVE, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]); |
| dump_memory(log, tid, addr, scopeFlags | SCOPE_SENSITIVE); |
| } |
| } |
| |
| /* explicitly allow upload of code dump logging */ |
| _LOG(log, scopeFlags, "\ncode around pc:\n"); |
| dump_memory(log, tid, (uintptr_t)regs.ARM_pc, scopeFlags); |
| |
| if (regs.ARM_pc != regs.ARM_lr) { |
| _LOG(log, scopeFlags, "\ncode around lr:\n"); |
| dump_memory(log, tid, (uintptr_t)regs.ARM_lr, scopeFlags); |
| } |
| } |
| |
| void dump_registers(const ptrace_context_t* context __attribute((unused)), |
| log_t* log, pid_t tid, bool at_fault) |
| { |
| struct pt_regs r; |
| int scopeFlags = at_fault ? SCOPE_AT_FAULT : 0; |
| |
| if(ptrace(PTRACE_GETREGS, tid, 0, &r)) { |
| _LOG(log, scopeFlags, "cannot get registers: %s\n", strerror(errno)); |
| return; |
| } |
| |
| _LOG(log, scopeFlags, " r0 %08x r1 %08x r2 %08x r3 %08x\n", |
| (uint32_t)r.ARM_r0, (uint32_t)r.ARM_r1, (uint32_t)r.ARM_r2, (uint32_t)r.ARM_r3); |
| _LOG(log, scopeFlags, " r4 %08x r5 %08x r6 %08x r7 %08x\n", |
| (uint32_t)r.ARM_r4, (uint32_t)r.ARM_r5, (uint32_t)r.ARM_r6, (uint32_t)r.ARM_r7); |
| _LOG(log, scopeFlags, " r8 %08x r9 %08x sl %08x fp %08x\n", |
| (uint32_t)r.ARM_r8, (uint32_t)r.ARM_r9, (uint32_t)r.ARM_r10, (uint32_t)r.ARM_fp); |
| _LOG(log, scopeFlags, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n", |
| (uint32_t)r.ARM_ip, (uint32_t)r.ARM_sp, (uint32_t)r.ARM_lr, |
| (uint32_t)r.ARM_pc, (uint32_t)r.ARM_cpsr); |
| |
| #ifdef WITH_VFP |
| struct user_vfp vfp_regs; |
| int i; |
| |
| if(ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) { |
| _LOG(log, scopeFlags, "cannot get registers: %s\n", strerror(errno)); |
| return; |
| } |
| |
| for (i = 0; i < NUM_VFP_REGS; i += 2) { |
| _LOG(log, scopeFlags, " d%-2d %016llx d%-2d %016llx\n", |
| i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]); |
| } |
| _LOG(log, scopeFlags, " scr %08lx\n", vfp_regs.fpscr); |
| #endif |
| } |
