6b788eeff2
Move gdb support functions and variables to linker_gdb_support.h/cpp Change-Id: I96c6592a7055715b18f1137367470fe80987263f
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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