108 lines
3.3 KiB
C++
108 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, "re");
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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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