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platform_system_core/debuggerd/arm/machine.c

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/* 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 <stdio.h>
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include <fcntl.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/ptrace.h>
#include <sys/wait.h>
#include <sys/exec_elf.h>
#include <sys/stat.h>
#include <cutils/sockets.h>
#include <cutils/properties.h>
#include <linux/input.h>
#include <linux/user.h>
#include "utility.h"
#ifdef WITH_VFP
#ifdef WITH_VFP_D32
#define NUM_VFP_REGS 32
#else
#define NUM_VFP_REGS 16
#endif
#endif
/* Main entry point to get the backtrace from the crashing process */
extern int unwind_backtrace_with_ptrace(int tfd, pid_t pid, mapinfo *map,
unsigned int sp_list[],
int *frame0_pc_sane,
bool at_fault);
void dump_stack_and_code(int tfd, int pid, mapinfo *map,
int unwind_depth, unsigned int sp_list[],
bool at_fault)
{
unsigned int sp, pc, p, end, data;
struct pt_regs r;
int sp_depth;
bool only_in_tombstone = !at_fault;
char code_buffer[80];
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) return;
sp = r.ARM_sp;
pc = r.ARM_pc;
_LOG(tfd, only_in_tombstone, "\ncode around pc:\n");
end = p = pc & ~3;
p -= 32;
if (p > end)
p = 0;
end += 32;
if (end < p)
end = ~0;
/* Dump the code around PC as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
if ((unsigned) r.ARM_lr != pc) {
_LOG(tfd, only_in_tombstone, "\ncode around lr:\n");
end = p = r.ARM_lr & ~3;
p -= 32;
if (p > end)
p = 0;
end += 32;
if (end < p)
end = ~0;
/* Dump the code around LR as:
* addr contents
* 00008d34 fffffcd0 4c0eb530 b0934a0e 1c05447c
* 00008d44 f7ff18a0 490ced94 68035860 d0012b00
*/
while (p <= end) {
int i;
sprintf(code_buffer, "%08x ", p);
for (i = 0; i < 4; i++) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
sprintf(code_buffer + strlen(code_buffer), "%08x ", data);
p += 4;
}
_LOG(tfd, only_in_tombstone, "%s\n", code_buffer);
}
}
p = sp - 64;
if (p > sp)
p = 0;
p &= ~3;
if (unwind_depth != 0) {
if (unwind_depth < STACK_CONTENT_DEPTH) {
end = sp_list[unwind_depth-1];
}
else {
end = sp_list[STACK_CONTENT_DEPTH-1];
}
}
else {
end = sp | 0x000000ff;
end += 0xff;
if (end < sp)
end = ~0;
}
_LOG(tfd, only_in_tombstone, "\nstack:\n");
/* If the crash is due to PC == 0, there will be two frames that
* have identical SP value.
*/
if (sp_list[0] == sp_list[1]) {
sp_depth = 1;
}
else {
sp_depth = 0;
}
while (p <= end) {
char *prompt;
char level[16];
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
if (p == sp_list[sp_depth]) {
sprintf(level, "#%02d", sp_depth++);
prompt = level;
}
else {
prompt = " ";
}
/* Print the stack content in the log for the first 3 frames. For the
* rest only print them in the tombstone file.
*/
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
"%s %08x %08x %s\n", prompt, p, data,
map_to_name(map, data, ""));
p += 4;
}
/* print another 64-byte of stack data after the last frame */
end = p+64;
if (end < p)
end = ~0;
while (p <= end) {
data = ptrace(PTRACE_PEEKTEXT, pid, (void*)p, NULL);
_LOG(tfd, (sp_depth > 2) || only_in_tombstone,
" %08x %08x %s\n", p, data,
map_to_name(map, data, ""));
p += 4;
}
}
void dump_pc_and_lr(int tfd, int pid, mapinfo *map, int unwound_level,
bool at_fault)
{
struct pt_regs r;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, !at_fault, "tid %d not responding!\n", pid);
return;
}
if (unwound_level == 0) {
_LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 0, r.ARM_pc,
map_to_name(map, r.ARM_pc, "<unknown>"));
}
_LOG(tfd, !at_fault, " #%02d lr %08x %s\n", 1, r.ARM_lr,
map_to_name(map, r.ARM_lr, "<unknown>"));
}
void dump_registers(int tfd, int pid, bool at_fault)
{
struct pt_regs r;
bool only_in_tombstone = !at_fault;
if(ptrace(PTRACE_GETREGS, pid, 0, &r)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
_LOG(tfd, only_in_tombstone, " r0 %08x r1 %08x r2 %08x r3 %08x\n",
r.ARM_r0, r.ARM_r1, r.ARM_r2, r.ARM_r3);
_LOG(tfd, only_in_tombstone, " r4 %08x r5 %08x r6 %08x r7 %08x\n",
r.ARM_r4, r.ARM_r5, r.ARM_r6, r.ARM_r7);
_LOG(tfd, only_in_tombstone, " r8 %08x r9 %08x 10 %08x fp %08x\n",
r.ARM_r8, r.ARM_r9, r.ARM_r10, r.ARM_fp);
_LOG(tfd, only_in_tombstone,
" ip %08x sp %08x lr %08x pc %08x cpsr %08x\n",
r.ARM_ip, r.ARM_sp, r.ARM_lr, r.ARM_pc, r.ARM_cpsr);
#ifdef WITH_VFP
struct user_vfp vfp_regs;
int i;
if(ptrace(PTRACE_GETVFPREGS, pid, 0, &vfp_regs)) {
_LOG(tfd, only_in_tombstone,
"cannot get registers: %s\n", strerror(errno));
return;
}
for (i = 0; i < NUM_VFP_REGS; i += 2) {
_LOG(tfd, only_in_tombstone,
" d%-2d %016llx d%-2d %016llx\n",
i, vfp_regs.fpregs[i], i+1, vfp_regs.fpregs[i+1]);
}
_LOG(tfd, only_in_tombstone, " scr %08lx\n\n", vfp_regs.fpscr);
#endif
}
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