utility.c revision 13e715b491e876865e752a3a69dd6f347049a488
1dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project/* system/debuggerd/utility.c 2dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 3dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Copyright 2008, The Android Open Source Project 4dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 5dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License"); 6dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** you may not use this file except in compliance with the License. 7dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** You may obtain a copy of the License at 8dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 9dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** http://www.apache.org/licenses/LICENSE-2.0 10dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** 11dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** Unless required by applicable law or agreed to in writing, software 12dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** distributed under the License is distributed on an "AS IS" BASIS, 13dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** See the License for the specific language governing permissions and 15dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project** limitations under the License. 16dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project*/ 17dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 18136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden#include <signal.h> 19dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <string.h> 2013e715b491e876865e752a3a69dd6f347049a488Jeff Brown#include <cutils/logd.h> 2113e715b491e876865e752a3a69dd6f347049a488Jeff Brown#include <sys/ptrace.h> 22dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include <errno.h> 2313e715b491e876865e752a3a69dd6f347049a488Jeff Brown#include <corkscrew/demangle.h> 24dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 25dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project#include "utility.h" 26dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 2713e715b491e876865e752a3a69dd6f347049a488Jeff Brown#define STACK_DEPTH 32 2813e715b491e876865e752a3a69dd6f347049a488Jeff Brown#define STACK_WORDS 16 2913e715b491e876865e752a3a69dd6f347049a488Jeff Brown 3013e715b491e876865e752a3a69dd6f347049a488Jeff Brownvoid _LOG(int tfd, bool in_tombstone_only, const char *fmt, ...) { 3113e715b491e876865e752a3a69dd6f347049a488Jeff Brown char buf[512]; 3213e715b491e876865e752a3a69dd6f347049a488Jeff Brown 3313e715b491e876865e752a3a69dd6f347049a488Jeff Brown va_list ap; 3413e715b491e876865e752a3a69dd6f347049a488Jeff Brown va_start(ap, fmt); 3513e715b491e876865e752a3a69dd6f347049a488Jeff Brown 3613e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (tfd >= 0) { 3713e715b491e876865e752a3a69dd6f347049a488Jeff Brown int len; 3813e715b491e876865e752a3a69dd6f347049a488Jeff Brown vsnprintf(buf, sizeof(buf), fmt, ap); 3913e715b491e876865e752a3a69dd6f347049a488Jeff Brown len = strlen(buf); 4013e715b491e876865e752a3a69dd6f347049a488Jeff Brown if(tfd >= 0) write(tfd, buf, len); 4113e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 4213e715b491e876865e752a3a69dd6f347049a488Jeff Brown 4313e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!in_tombstone_only) 4413e715b491e876865e752a3a69dd6f347049a488Jeff Brown __android_log_vprint(ANDROID_LOG_INFO, "DEBUG", fmt, ap); 4513e715b491e876865e752a3a69dd6f347049a488Jeff Brown va_end(ap); 46dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 47dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 4813e715b491e876865e752a3a69dd6f347049a488Jeff Brownbool signal_has_address(int sig) { 4913e715b491e876865e752a3a69dd6f347049a488Jeff Brown switch (sig) { 5013e715b491e876865e752a3a69dd6f347049a488Jeff Brown case SIGILL: 5113e715b491e876865e752a3a69dd6f347049a488Jeff Brown case SIGFPE: 5213e715b491e876865e752a3a69dd6f347049a488Jeff Brown case SIGSEGV: 5313e715b491e876865e752a3a69dd6f347049a488Jeff Brown case SIGBUS: 5413e715b491e876865e752a3a69dd6f347049a488Jeff Brown return true; 5513e715b491e876865e752a3a69dd6f347049a488Jeff Brown default: 5613e715b491e876865e752a3a69dd6f347049a488Jeff Brown return false; 5713e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 5813e715b491e876865e752a3a69dd6f347049a488Jeff Brown} 59dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 6013e715b491e876865e752a3a69dd6f347049a488Jeff Brownstatic void dump_backtrace(ptrace_context_t* context __attribute((unused)), 6113e715b491e876865e752a3a69dd6f347049a488Jeff Brown int tfd, int pid __attribute((unused)), bool at_fault, 6213e715b491e876865e752a3a69dd6f347049a488Jeff Brown const backtrace_frame_t* backtrace, size_t frames) { 6313e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, !at_fault, "\nbacktrace:\n"); 64dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 6513e715b491e876865e752a3a69dd6f347049a488Jeff Brown backtrace_symbol_t backtrace_symbols[STACK_DEPTH]; 6613e715b491e876865e752a3a69dd6f347049a488Jeff Brown get_backtrace_symbols_ptrace(context, backtrace, frames, backtrace_symbols); 6713e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (size_t i = 0; i < frames; i++) { 6813e715b491e876865e752a3a69dd6f347049a488Jeff Brown const backtrace_symbol_t* symbol = &backtrace_symbols[i]; 6913e715b491e876865e752a3a69dd6f347049a488Jeff Brown const char* map_name = symbol->map_info ? symbol->map_info->name : "<unknown>"; 7013e715b491e876865e752a3a69dd6f347049a488Jeff Brown const char* symbol_name = symbol->demangled_name ? symbol->demangled_name : symbol->name; 7113e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (symbol_name) { 7213e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, !at_fault, " #%02d pc %08x %s (%s)\n", 7313e715b491e876865e752a3a69dd6f347049a488Jeff Brown (int)i, symbol->relative_pc, map_name, symbol_name); 7413e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 7513e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, !at_fault, " #%02d pc %08x %s\n", 7613e715b491e876865e752a3a69dd6f347049a488Jeff Brown (int)i, symbol->relative_pc, map_name); 7713e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 78dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 7913e715b491e876865e752a3a69dd6f347049a488Jeff Brown free_backtrace_symbols(backtrace_symbols, frames); 8013e715b491e876865e752a3a69dd6f347049a488Jeff Brown} 8113e715b491e876865e752a3a69dd6f347049a488Jeff Brown 8213e715b491e876865e752a3a69dd6f347049a488Jeff Brownstatic void dump_stack_segment(ptrace_context_t* context, int tfd, int pid, 8313e715b491e876865e752a3a69dd6f347049a488Jeff Brown bool only_in_tombstone, uintptr_t* sp, size_t words, int label) { 8413e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (size_t i = 0; i < words; i++) { 8513e715b491e876865e752a3a69dd6f347049a488Jeff Brown uint32_t stack_content; 8613e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!try_get_word(pid, *sp, &stack_content)) { 8713e715b491e876865e752a3a69dd6f347049a488Jeff Brown break; 8813e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 89dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 9013e715b491e876865e752a3a69dd6f347049a488Jeff Brown const map_info_t* mi; 9113e715b491e876865e752a3a69dd6f347049a488Jeff Brown const symbol_t* symbol; 9213e715b491e876865e752a3a69dd6f347049a488Jeff Brown find_symbol_ptrace(context, stack_content, &mi, &symbol); 93dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 9413e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (symbol) { 9513e715b491e876865e752a3a69dd6f347049a488Jeff Brown char* demangled_name = demangle_symbol_name(symbol->name); 9613e715b491e876865e752a3a69dd6f347049a488Jeff Brown const char* symbol_name = demangled_name ? demangled_name : symbol->name; 9713e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!i && label >= 0) { 9813e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " #%02d %08x %08x %s (%s)\n", 9913e715b491e876865e752a3a69dd6f347049a488Jeff Brown label, *sp, stack_content, mi ? mi->name : "", symbol_name); 10013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 10113e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " %08x %08x %s (%s)\n", 10213e715b491e876865e752a3a69dd6f347049a488Jeff Brown *sp, stack_content, mi ? mi->name : "", symbol_name); 10313e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 10413e715b491e876865e752a3a69dd6f347049a488Jeff Brown free(demangled_name); 10513e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 10613e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!i && label >= 0) { 10713e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " #%02d %08x %08x %s\n", 10813e715b491e876865e752a3a69dd6f347049a488Jeff Brown label, *sp, stack_content, mi ? mi->name : ""); 10913e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 11013e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " %08x %08x %s\n", 11113e715b491e876865e752a3a69dd6f347049a488Jeff Brown *sp, stack_content, mi ? mi->name : ""); 11213e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 113dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 11413e715b491e876865e752a3a69dd6f347049a488Jeff Brown 11513e715b491e876865e752a3a69dd6f347049a488Jeff Brown *sp += sizeof(uint32_t); 116dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 117dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 118dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 11913e715b491e876865e752a3a69dd6f347049a488Jeff Brownstatic void dump_stack(ptrace_context_t* context, int tfd, int pid, bool at_fault, 12013e715b491e876865e752a3a69dd6f347049a488Jeff Brown const backtrace_frame_t* backtrace, size_t frames) { 12113e715b491e876865e752a3a69dd6f347049a488Jeff Brown bool have_first = false; 12213e715b491e876865e752a3a69dd6f347049a488Jeff Brown size_t first, last; 12313e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (size_t i = 0; i < frames; i++) { 12413e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (backtrace[i].stack_top) { 12513e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!have_first) { 12613e715b491e876865e752a3a69dd6f347049a488Jeff Brown have_first = true; 12713e715b491e876865e752a3a69dd6f347049a488Jeff Brown first = i; 12813e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 12913e715b491e876865e752a3a69dd6f347049a488Jeff Brown last = i; 13013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 13113e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 13213e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!have_first) { 13313e715b491e876865e752a3a69dd6f347049a488Jeff Brown return; 13413e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 13513e715b491e876865e752a3a69dd6f347049a488Jeff Brown 13613e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, !at_fault, "\nstack:\n"); 13713e715b491e876865e752a3a69dd6f347049a488Jeff Brown 13813e715b491e876865e752a3a69dd6f347049a488Jeff Brown // Dump a few words before the first frame. 13913e715b491e876865e752a3a69dd6f347049a488Jeff Brown bool only_in_tombstone = !at_fault; 14013e715b491e876865e752a3a69dd6f347049a488Jeff Brown uintptr_t sp = backtrace[first].stack_top - STACK_WORDS * sizeof(uint32_t); 14113e715b491e876865e752a3a69dd6f347049a488Jeff Brown dump_stack_segment(context, tfd, pid, only_in_tombstone, &sp, STACK_WORDS, -1); 14213e715b491e876865e752a3a69dd6f347049a488Jeff Brown 14313e715b491e876865e752a3a69dd6f347049a488Jeff Brown // Dump a few words from all successive frames. 14413e715b491e876865e752a3a69dd6f347049a488Jeff Brown // Only log the first 3 frames, put the rest in the tombstone. 14513e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (size_t i = first; i <= last; i++) { 14613e715b491e876865e752a3a69dd6f347049a488Jeff Brown const backtrace_frame_t* frame = &backtrace[i]; 14713e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (sp != frame->stack_top) { 14813e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " ........ ........\n"); 14913e715b491e876865e752a3a69dd6f347049a488Jeff Brown sp = frame->stack_top; 15013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 15113e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (i - first == 3) { 15213e715b491e876865e752a3a69dd6f347049a488Jeff Brown only_in_tombstone = true; 153dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 15413e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (i == last) { 15513e715b491e876865e752a3a69dd6f347049a488Jeff Brown dump_stack_segment(context, tfd, pid, only_in_tombstone, &sp, STACK_WORDS, i); 15613e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (sp < frame->stack_top + frame->stack_size) { 15713e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, only_in_tombstone, " ........ ........\n"); 15813e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 15913e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 16013e715b491e876865e752a3a69dd6f347049a488Jeff Brown size_t words = frame->stack_size / sizeof(uint32_t); 16113e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (words == 0) { 16213e715b491e876865e752a3a69dd6f347049a488Jeff Brown words = 1; 16313e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else if (words > STACK_WORDS) { 16413e715b491e876865e752a3a69dd6f347049a488Jeff Brown words = STACK_WORDS; 16513e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 16613e715b491e876865e752a3a69dd6f347049a488Jeff Brown dump_stack_segment(context, tfd, pid, only_in_tombstone, &sp, words, i); 16713e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 16813e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 16913e715b491e876865e752a3a69dd6f347049a488Jeff Brown} 17013e715b491e876865e752a3a69dd6f347049a488Jeff Brown 17113e715b491e876865e752a3a69dd6f347049a488Jeff Brownvoid dump_backtrace_and_stack(ptrace_context_t* context, int tfd, pid_t tid, bool at_fault) { 17213e715b491e876865e752a3a69dd6f347049a488Jeff Brown backtrace_frame_t backtrace[STACK_DEPTH]; 17313e715b491e876865e752a3a69dd6f347049a488Jeff Brown ssize_t frames = unwind_backtrace_ptrace(tid, context, backtrace, 0, STACK_DEPTH); 17413e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (frames > 0) { 17513e715b491e876865e752a3a69dd6f347049a488Jeff Brown dump_backtrace(context, tfd, tid, at_fault, backtrace, frames); 17613e715b491e876865e752a3a69dd6f347049a488Jeff Brown dump_stack(context, tfd, tid, at_fault, backtrace, frames); 177dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 178dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 179dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project 18013e715b491e876865e752a3a69dd6f347049a488Jeff Brownvoid dump_memory(int tfd, pid_t tid, uintptr_t addr, bool at_fault) { 18113e715b491e876865e752a3a69dd6f347049a488Jeff Brown char code_buffer[64]; /* actual 8+1+((8+1)*4) + 1 == 45 */ 18213e715b491e876865e752a3a69dd6f347049a488Jeff Brown char ascii_buffer[32]; /* actual 16 + 1 == 17 */ 18313e715b491e876865e752a3a69dd6f347049a488Jeff Brown uintptr_t p, end; 18413e715b491e876865e752a3a69dd6f347049a488Jeff Brown 18513e715b491e876865e752a3a69dd6f347049a488Jeff Brown p = addr & ~3; 18613e715b491e876865e752a3a69dd6f347049a488Jeff Brown p -= 32; 18713e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (p > addr) { 18813e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* catch underflow */ 18913e715b491e876865e752a3a69dd6f347049a488Jeff Brown p = 0; 19013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 19113e715b491e876865e752a3a69dd6f347049a488Jeff Brown end = p + 80; 19213e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* catch overflow; 'end - p' has to be multiples of 16 */ 19313e715b491e876865e752a3a69dd6f347049a488Jeff Brown while (end < p) 19413e715b491e876865e752a3a69dd6f347049a488Jeff Brown end -= 16; 19513e715b491e876865e752a3a69dd6f347049a488Jeff Brown 19613e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* Dump the code around PC as: 19713e715b491e876865e752a3a69dd6f347049a488Jeff Brown * addr contents ascii 19813e715b491e876865e752a3a69dd6f347049a488Jeff Brown * 00008d34 ef000000 e8bd0090 e1b00000 512fff1e ............../Q 19913e715b491e876865e752a3a69dd6f347049a488Jeff Brown * 00008d44 ea00b1f9 e92d0090 e3a070fc ef000000 ......-..p...... 20013e715b491e876865e752a3a69dd6f347049a488Jeff Brown */ 20113e715b491e876865e752a3a69dd6f347049a488Jeff Brown while (p < end) { 20213e715b491e876865e752a3a69dd6f347049a488Jeff Brown char* asc_out = ascii_buffer; 20313e715b491e876865e752a3a69dd6f347049a488Jeff Brown 20413e715b491e876865e752a3a69dd6f347049a488Jeff Brown sprintf(code_buffer, "%08x ", p); 20513e715b491e876865e752a3a69dd6f347049a488Jeff Brown 20613e715b491e876865e752a3a69dd6f347049a488Jeff Brown int i; 20713e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (i = 0; i < 4; i++) { 20813e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* 20913e715b491e876865e752a3a69dd6f347049a488Jeff Brown * If we see (data == -1 && errno != 0), we know that the ptrace 21013e715b491e876865e752a3a69dd6f347049a488Jeff Brown * call failed, probably because we're dumping memory in an 21113e715b491e876865e752a3a69dd6f347049a488Jeff Brown * unmapped or inaccessible page. I don't know if there's 21213e715b491e876865e752a3a69dd6f347049a488Jeff Brown * value in making that explicit in the output -- it likely 21313e715b491e876865e752a3a69dd6f347049a488Jeff Brown * just complicates parsing and clarifies nothing for the 21413e715b491e876865e752a3a69dd6f347049a488Jeff Brown * enlightened reader. 21513e715b491e876865e752a3a69dd6f347049a488Jeff Brown */ 21613e715b491e876865e752a3a69dd6f347049a488Jeff Brown long data = ptrace(PTRACE_PEEKTEXT, tid, (void*)p, NULL); 21713e715b491e876865e752a3a69dd6f347049a488Jeff Brown sprintf(code_buffer + strlen(code_buffer), "%08lx ", data); 21813e715b491e876865e752a3a69dd6f347049a488Jeff Brown 21913e715b491e876865e752a3a69dd6f347049a488Jeff Brown int j; 22013e715b491e876865e752a3a69dd6f347049a488Jeff Brown for (j = 0; j < 4; j++) { 22113e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* 22213e715b491e876865e752a3a69dd6f347049a488Jeff Brown * Our isprint() allows high-ASCII characters that display 22313e715b491e876865e752a3a69dd6f347049a488Jeff Brown * differently (often badly) in different viewers, so we 22413e715b491e876865e752a3a69dd6f347049a488Jeff Brown * just use a simpler test. 22513e715b491e876865e752a3a69dd6f347049a488Jeff Brown */ 22613e715b491e876865e752a3a69dd6f347049a488Jeff Brown char val = (data >> (j*8)) & 0xff; 22713e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (val >= 0x20 && val < 0x7f) { 22813e715b491e876865e752a3a69dd6f347049a488Jeff Brown *asc_out++ = val; 22913e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 23013e715b491e876865e752a3a69dd6f347049a488Jeff Brown *asc_out++ = '.'; 23113e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 232dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 23313e715b491e876865e752a3a69dd6f347049a488Jeff Brown p += 4; 234dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 23513e715b491e876865e752a3a69dd6f347049a488Jeff Brown *asc_out = '\0'; 23613e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, !at_fault, " %s %s\n", code_buffer, ascii_buffer); 237dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project } 238dd7bc3319deb2b77c5d07a51b7d6cd7e11b5beb0The Android Open Source Project} 239136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden 24013e715b491e876865e752a3a69dd6f347049a488Jeff Brownvoid dump_nearby_maps(ptrace_context_t* context, int tfd, pid_t tid) { 24113e715b491e876865e752a3a69dd6f347049a488Jeff Brown siginfo_t si; 24213e715b491e876865e752a3a69dd6f347049a488Jeff Brown memset(&si, 0, sizeof(si)); 24313e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (ptrace(PTRACE_GETSIGINFO, tid, 0, &si)) { 24413e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, "cannot get siginfo for %d: %s\n", 24513e715b491e876865e752a3a69dd6f347049a488Jeff Brown tid, strerror(errno)); 24613e715b491e876865e752a3a69dd6f347049a488Jeff Brown return; 24713e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 24813e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (!signal_has_address(si.si_signo)) { 24913e715b491e876865e752a3a69dd6f347049a488Jeff Brown return; 25013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 25113e715b491e876865e752a3a69dd6f347049a488Jeff Brown 25213e715b491e876865e752a3a69dd6f347049a488Jeff Brown uintptr_t addr = (uintptr_t) si.si_addr; 25313e715b491e876865e752a3a69dd6f347049a488Jeff Brown addr &= ~0xfff; /* round to 4K page boundary */ 25413e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (addr == 0) { /* null-pointer deref */ 25513e715b491e876865e752a3a69dd6f347049a488Jeff Brown return; 25613e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 25713e715b491e876865e752a3a69dd6f347049a488Jeff Brown 25813e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, "\nmemory map around fault addr %08x:\n", (int)si.si_addr); 25913e715b491e876865e752a3a69dd6f347049a488Jeff Brown 26013e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* 26113e715b491e876865e752a3a69dd6f347049a488Jeff Brown * Search for a match, or for a hole where the match would be. The list 26213e715b491e876865e752a3a69dd6f347049a488Jeff Brown * is backward from the file content, so it starts at high addresses. 26313e715b491e876865e752a3a69dd6f347049a488Jeff Brown */ 26413e715b491e876865e752a3a69dd6f347049a488Jeff Brown bool found = false; 26513e715b491e876865e752a3a69dd6f347049a488Jeff Brown map_info_t* map = context->map_info_list; 26613e715b491e876865e752a3a69dd6f347049a488Jeff Brown map_info_t *next = NULL; 26713e715b491e876865e752a3a69dd6f347049a488Jeff Brown map_info_t *prev = NULL; 26813e715b491e876865e752a3a69dd6f347049a488Jeff Brown while (map != NULL) { 26913e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (addr >= map->start && addr < map->end) { 27013e715b491e876865e752a3a69dd6f347049a488Jeff Brown found = true; 27113e715b491e876865e752a3a69dd6f347049a488Jeff Brown next = map->next; 27213e715b491e876865e752a3a69dd6f347049a488Jeff Brown break; 27313e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else if (addr >= map->end) { 27413e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* map would be between "prev" and this entry */ 27513e715b491e876865e752a3a69dd6f347049a488Jeff Brown next = map; 27613e715b491e876865e752a3a69dd6f347049a488Jeff Brown map = NULL; 27713e715b491e876865e752a3a69dd6f347049a488Jeff Brown break; 27813e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 27913e715b491e876865e752a3a69dd6f347049a488Jeff Brown 28013e715b491e876865e752a3a69dd6f347049a488Jeff Brown prev = map; 28113e715b491e876865e752a3a69dd6f347049a488Jeff Brown map = map->next; 28213e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 28313e715b491e876865e752a3a69dd6f347049a488Jeff Brown 28413e715b491e876865e752a3a69dd6f347049a488Jeff Brown /* 28513e715b491e876865e752a3a69dd6f347049a488Jeff Brown * Show "next" then "match" then "prev" so that the addresses appear in 28613e715b491e876865e752a3a69dd6f347049a488Jeff Brown * ascending order (like /proc/pid/maps). 28713e715b491e876865e752a3a69dd6f347049a488Jeff Brown */ 28813e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (next != NULL) { 28913e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " %08x-%08x %s\n", next->start, next->end, next->name); 29013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 29113e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " (no map below)\n"); 29213e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 29313e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (map != NULL) { 29413e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " %08x-%08x %s\n", map->start, map->end, map->name); 29513e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 29613e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " (no map for address)\n"); 29713e715b491e876865e752a3a69dd6f347049a488Jeff Brown } 29813e715b491e876865e752a3a69dd6f347049a488Jeff Brown if (prev != NULL) { 29913e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " %08x-%08x %s\n", prev->start, prev->end, prev->name); 30013e715b491e876865e752a3a69dd6f347049a488Jeff Brown } else { 30113e715b491e876865e752a3a69dd6f347049a488Jeff Brown _LOG(tfd, false, " (no map above)\n"); 302136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden } 303136dcc5ce628a1ba600a6818e5cb24d5f15eb016Andy McFadden} 304