c701e5b335
Create a method of disabling the debug allocation code paths so that
it's possible to use the libunwindbacktrace library without any
modifications.
Use this path to create and destroy the maps for the process. It's not
stricly necessary in the init code since the symbols are not modified
until after the initialize calls.
Also, remove the debug_XXX source files that doesn't need to be in libc.so.
Fix the maps reading code since it was completely broken for 64 bit.
Bug: 16408686
(cherry picked from commit 861c0ef37b)
Change-Id: I04445f0cf9a1e85172b64d57df92eb7939ce2332
109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "debug_mapinfo.h"
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#include "malloc_debug_disable.h"
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// Format of /proc/<PID>/maps:
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// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419 /system/lib/libcomposer.so
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static mapinfo_t* parse_maps_line(char* line) {
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uintptr_t start;
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uintptr_t end;
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int name_pos;
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if (sscanf(line, "%" PRIxPTR "-%" PRIxPTR " %*4s %*x %*x:%*x %*d%n", &start,
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&end, &name_pos) < 2) {
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return NULL;
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}
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while (isspace(line[name_pos])) {
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name_pos += 1;
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}
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const char* name = line + name_pos;
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size_t name_len = strlen(name);
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if (name_len && name[name_len - 1] == '\n') {
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name_len -= 1;
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}
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mapinfo_t* mi = reinterpret_cast<mapinfo_t*>(calloc(1, sizeof(mapinfo_t) + name_len + 1));
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if (mi) {
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mi->start = start;
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mi->end = end;
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memcpy(mi->name, name, name_len);
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mi->name[name_len] = '\0';
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}
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return mi;
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}
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__LIBC_HIDDEN__ mapinfo_t* mapinfo_create(pid_t pid) {
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ScopedDisableDebugCalls disable;
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struct mapinfo_t* milist = NULL;
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char data[1024]; // Used to read lines as well as to construct the filename.
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snprintf(data, sizeof(data), "/proc/%d/maps", pid);
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FILE* fp = fopen(data, "r");
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if (fp != NULL) {
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while (fgets(data, sizeof(data), fp) != NULL) {
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mapinfo_t* mi = parse_maps_line(data);
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if (mi) {
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mi->next = milist;
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milist = mi;
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}
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}
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fclose(fp);
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}
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return milist;
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}
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__LIBC_HIDDEN__ void mapinfo_destroy(mapinfo_t* mi) {
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ScopedDisableDebugCalls disable;
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while (mi != NULL) {
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mapinfo_t* del = mi;
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mi = mi->next;
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free(del);
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}
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}
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// Find the containing map info for the PC.
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__LIBC_HIDDEN__ const mapinfo_t* mapinfo_find(mapinfo_t* mi, uintptr_t pc, uintptr_t* rel_pc) {
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for (; mi != NULL; mi = mi->next) {
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if ((pc >= mi->start) && (pc < mi->end)) {
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*rel_pc = pc - mi->start;
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return mi;
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}
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}
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*rel_pc = pc;
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return NULL;
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}
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