185 lines
6 KiB
C
185 lines
6 KiB
C
/* system/debuggerd/debuggerd.c
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**
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** Copyright 2006, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <corkscrew/ptrace.h>
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#include <linux/user.h>
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#include "../utility.h"
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#include "../machine.h"
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/* enable to dump memory pointed to by every register */
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#define DUMP_MEMORY_FOR_ALL_REGISTERS 1
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#ifdef WITH_VFP
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#ifdef WITH_VFP_D32
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#define NUM_VFP_REGS 32
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#else
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#define NUM_VFP_REGS 16
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#endif
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#endif
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static void dump_memory(log_t* log, pid_t tid, uintptr_t addr, bool at_fault) {
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char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */
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char ascii_buffer[32]; /* actual 16 + 1 == 17 */
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uintptr_t p, end;
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p = addr & ~3;
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p -= 32;
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if (p > addr) {
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/* catch underflow */
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p = 0;
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}
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/* Dump more memory content for the crashing thread. */
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end = p + 256;
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/* catch overflow; 'end - p' has to be multiples of 16 */
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while (end < p)
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end -= 16;
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/* Dump the code around PC as:
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* addr contents ascii
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* 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q
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* 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p......
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*/
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while (p < end) {
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char* asc_out = ascii_buffer;
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sprintf(code_buffer, "%08x ", p);
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int i;
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for (i = 0; i < 4; i++) {
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/*
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* If we see (data == -1 && errno != 0), we know that the ptrace
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* call failed, probably because we're dumping memory in an
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* unmapped or inaccessible page. I don't know if there's
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* value in making that explicit in the output -- it likely
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* just complicates parsing and clarifies nothing for the
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* enlightened reader.
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*/
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long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL);
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sprintf(code_buffer + strlen(code_buffer), "%08lx ", data);
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/* Enable the following code blob to dump ASCII values */
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#if 0
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int j;
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for (j = 0; j < 4; j++) {
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/*
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* Our isprint() allows high-ASCII characters that display
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* differently (often badly) in different viewers, so we
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* just use a simpler test.
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*/
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char val = (data >> (j*8)) & 0xff;
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if (val >= 0x20 && val < 0x7f) {
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*asc_out++ = val;
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} else {
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*asc_out++ = '.';
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}
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}
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#endif
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p += 4;
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}
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*asc_out = '\0';
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_LOG(log, !at_fault, " %s %s\n", code_buffer, ascii_buffer);
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}
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}
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/*
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* If configured to do so, dump memory around *all* registers
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* for the crashing thread.
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*/
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void dump_memory_and_code(const ptrace_context_t* context __attribute((unused)),
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log_t* log, pid_t tid, bool at_fault) {
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struct pt_regs regs;
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if(ptrace(PTRACE_GETREGS, tid, 0, ®s)) {
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return;
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}
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if (at_fault && DUMP_MEMORY_FOR_ALL_REGISTERS) {
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static const char REG_NAMES[] = "r0r1r2r3r4r5r6r7r8r9slfpipsp";
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for (int reg = 0; reg < 14; reg++) {
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/* this may not be a valid way to access, but it'll do for now */
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uintptr_t addr = regs.uregs[reg];
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/*
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* Don't bother if it looks like a small int or ~= null, or if
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* it's in the kernel area.
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*/
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if (addr < 4096 || addr >= 0xc0000000) {
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continue;
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}
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_LOG(log, false, "\nmemory near %.2s:\n", ®_NAMES[reg * 2]);
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dump_memory(log, tid, addr, at_fault);
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}
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}
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_LOG(log, !at_fault, "\ncode around pc:\n");
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dump_memory(log, tid, (uintptr_t)regs.ARM_pc, at_fault);
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if (regs.ARM_pc != regs.ARM_lr) {
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_LOG(log, !at_fault, "\ncode around lr:\n");
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dump_memory(log, tid, (uintptr_t)regs.ARM_lr, at_fault);
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}
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}
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void dump_registers(const ptrace_context_t* context __attribute((unused)),
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log_t* log, pid_t tid, bool at_fault)
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{
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struct pt_regs r;
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bool only_in_tombstone = !at_fault;
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if(ptrace(PTRACE_GETREGS, tid, 0, &r)) {
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_LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno));
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return;
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}
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_LOG(log, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
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(uint32_t)r.ARM_r0, (uint32_t)r.ARM_r1, (uint32_t)r.ARM_r2, (uint32_t)r.ARM_r3);
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_LOG(log, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
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(uint32_t)r.ARM_r4, (uint32_t)r.ARM_r5, (uint32_t)r.ARM_r6, (uint32_t)r.ARM_r7);
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_LOG(log, only_in_tombstone, " r8 %08x r9 %08x sl %08x fp %08x\n",
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(uint32_t)r.ARM_r8, (uint32_t)r.ARM_r9, (uint32_t)r.ARM_r10, (uint32_t)r.ARM_fp);
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_LOG(log, only_in_tombstone, " ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
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(uint32_t)r.ARM_ip, (uint32_t)r.ARM_sp, (uint32_t)r.ARM_lr,
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(uint32_t)r.ARM_pc, (uint32_t)r.ARM_cpsr);
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#ifdef WITH_VFP
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struct user_vfp vfp_regs;
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int i;
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if(ptrace(PTRACE_GETVFPREGS, tid, 0, &vfp_regs)) {
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_LOG(log, only_in_tombstone, "cannot get registers: %s\n", strerror(errno));
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return;
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}
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for (i = 0; i < NUM_VFP_REGS; i += 2) {
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_LOG(log, only_in_tombstone, " d%-2d %016llx d%-2d %016llx\n",
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i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
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}
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_LOG(log, only_in_tombstone, " scr %08lx\n", vfp_regs.fpscr);
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#endif
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}
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