95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 2016 The Android Open Source Project
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "linker_gdb_support.h"
|
||
|
|
|
||
|
|
#include <pthread.h>
|
||
|
|
|
||
|
|
#include "private/ScopedPthreadMutexLocker.h"
|
||
|
|
|
||
|
|
// This function is an empty stub where GDB locates a breakpoint to get notified
|
||
|
|
// about linker activity.
|
||
|
|
extern "C"
|
||
|
|
void __attribute__((noinline)) __attribute__((visibility("default"))) rtld_db_dlactivity();
|
||
|
|
|
||
|
|
r_debug _r_debug =
|
||
|
|
{1, nullptr, reinterpret_cast<uintptr_t>(&rtld_db_dlactivity), r_debug::RT_CONSISTENT, 0};
|
||
|
|
|
||
|
|
static pthread_mutex_t g__r_debug_mutex = PTHREAD_MUTEX_INITIALIZER;
|
||
|
|
static link_map* r_debug_tail = nullptr;
|
||
|
|
|
||
|
|
void insert_link_map_into_debug_map(link_map* map) {
|
||
|
|
// Stick the new library at the end of the list.
|
||
|
|
// gdb tends to care more about libc than it does
|
||
|
|
// about leaf libraries, and ordering it this way
|
||
|
|
// reduces the back-and-forth over the wire.
|
||
|
|
if (r_debug_tail != nullptr) {
|
||
|
|
r_debug_tail->l_next = map;
|
||
|
|
map->l_prev = r_debug_tail;
|
||
|
|
map->l_next = nullptr;
|
||
|
|
} else {
|
||
|
|
_r_debug.r_map = map;
|
||
|
|
map->l_prev = nullptr;
|
||
|
|
map->l_next = nullptr;
|
||
|
|
}
|
||
|
|
r_debug_tail = map;
|
||
|
|
}
|
||
|
|
|
||
|
|
void remove_link_map_from_debug_map(link_map* map) {
|
||
|
|
if (r_debug_tail == map) {
|
||
|
|
r_debug_tail = map->l_prev;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (map->l_prev) {
|
||
|
|
map->l_prev->l_next = map->l_next;
|
||
|
|
}
|
||
|
|
if (map->l_next) {
|
||
|
|
map->l_next->l_prev = map->l_prev;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void notify_gdb_of_load(link_map* map) {
|
||
|
|
ScopedPthreadMutexLocker locker(&g__r_debug_mutex);
|
||
|
|
|
||
|
|
_r_debug.r_state = r_debug::RT_ADD;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
|
||
|
|
insert_link_map_into_debug_map(map);
|
||
|
|
|
||
|
|
_r_debug.r_state = r_debug::RT_CONSISTENT;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
}
|
||
|
|
|
||
|
|
void notify_gdb_of_unload(link_map* map) {
|
||
|
|
ScopedPthreadMutexLocker locker(&g__r_debug_mutex);
|
||
|
|
|
||
|
|
_r_debug.r_state = r_debug::RT_DELETE;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
|
||
|
|
remove_link_map_from_debug_map(map);
|
||
|
|
|
||
|
|
_r_debug.r_state = r_debug::RT_CONSISTENT;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
}
|
||
|
|
|
||
|
|
void notify_gdb_of_libraries() {
|
||
|
|
_r_debug.r_state = r_debug::RT_ADD;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
_r_debug.r_state = r_debug::RT_CONSISTENT;
|
||
|
|
rtld_db_dlactivity();
|
||
|
|
}
|
||
|
|
|