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107 lines
3.3 KiB
107 lines
3.3 KiB
/*
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* Copyright (C) 2016 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 "linker_gdb_support.h"
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#include <pthread.h>
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#include "private/ScopedPthreadMutexLocker.h"
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// This function is an empty stub where GDB locates a breakpoint to get notified
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// about linker activity.
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extern "C"
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void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity();
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r_debug _r_debug =
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{1, nullptr, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0};
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static pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER;
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static link_map* r_debug_tail = nullptr;
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void insert_link_map_into_debug_map(link_map* map) {
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// Stick the new library at the end of the list.
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// gdb tends to care more about libc than it does
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// about leaf libraries, and ordering it this way
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// reduces the back-and-forth over the wire.
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if (r_debug_tail != nullptr) {
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r_debug_tail->l_next = map;
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map->l_prev = r_debug_tail;
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map->l_next = nullptr;
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} else {
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_r_debug.r_map = map;
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map->l_prev = nullptr;
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map->l_next = nullptr;
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}
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r_debug_tail = map;
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}
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void remove_link_map_from_debug_map(link_map* map) {
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if (r_debug_tail == map) {
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r_debug_tail = map->l_prev;
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}
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if (map->l_prev) {
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map->l_prev->l_next = map->l_next;
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}
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if (map->l_next) {
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map->l_next->l_prev = map->l_prev;
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}
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}
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void notify_gdb_of_load(link_map* map) {
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ScopedPthreadMutexLocker locker(&g__r_debug_mutex);
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_r_debug.r_state = r_debug::RT_ADD;
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rtld_db_dlactivity();
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insert_link_map_into_debug_map(map);
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_r_debug.r_state = r_debug::RT_CONSISTENT;
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rtld_db_dlactivity();
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}
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void notify_gdb_of_unload(link_map* map) {
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ScopedPthreadMutexLocker locker(&g__r_debug_mutex);
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_r_debug.r_state = r_debug::RT_DELETE;
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rtld_db_dlactivity();
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remove_link_map_from_debug_map(map);
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_r_debug.r_state = r_debug::RT_CONSISTENT;
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rtld_db_dlactivity();
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}
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void notify_gdb_of_libraries() {
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_r_debug.r_state = r_debug::RT_ADD;
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rtld_db_dlactivity();
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_r_debug.r_state = r_debug::RT_CONSISTENT;
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rtld_db_dlactivity();
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}
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