diff options
Diffstat (limited to 'linker/linker_gdb_support.cpp')
-rw-r--r-- | linker/linker_gdb_support.cpp | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/linker/linker_gdb_support.cpp b/linker/linker_gdb_support.cpp deleted file mode 100644 index de7408740..000000000 --- a/linker/linker_gdb_support.cpp +++ /dev/null @@ -1,94 +0,0 @@ -/* - * 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(); -} - |