132 lines
5.1 KiB
C++
132 lines
5.1 KiB
C++
/*
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* Copyright (C) 2015 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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#ifndef _PRIVATE_BIONIC_GLOBALS_H
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#define _PRIVATE_BIONIC_GLOBALS_H
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#include <stdatomic.h>
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#include <sys/cdefs.h>
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#include <link.h>
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#include <pthread.h>
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#include "private/bionic_allocator.h"
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#include "private/bionic_elf_tls.h"
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#include "private/bionic_fdsan.h"
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#include "private/bionic_malloc_dispatch.h"
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#include "private/bionic_vdso.h"
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#include "private/WriteProtected.h"
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#include <platform/bionic/malloc.h>
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struct libc_globals {
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vdso_entry vdso[VDSO_END];
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long setjmp_cookie;
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uintptr_t heap_pointer_tag;
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// In order to allow a complete switch between dispatch tables without
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// the need for copying each function by function in the structure,
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// use a single atomic pointer to switch.
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// The current_dispatch_table pointer can only ever be set to a complete
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// table. Any dispatch table that is pointed to by current_dispatch_table
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// cannot be modified after that. If the pointer changes in the future,
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// the old pointer must always stay valid.
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// The malloc_dispatch_table is modified by malloc debug, malloc hooks,
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// and heaprofd. Only one of these modes can be active at any given time.
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_Atomic(const MallocDispatch*) current_dispatch_table;
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// This pointer is only used by the allocation limit code when both a
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// limit is enabled and some other hook is enabled at the same time.
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_Atomic(const MallocDispatch*) default_dispatch_table;
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MallocDispatch malloc_dispatch_table;
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};
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__LIBC_HIDDEN__ extern WriteProtected<libc_globals> __libc_globals;
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struct abort_msg_t;
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namespace gwp_asan {
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struct AllocatorState;
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struct AllocationMetadata;
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}; // namespace gwp_asan
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// Globals shared between the dynamic linker and libc.so.
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struct libc_shared_globals {
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// Construct the shared globals using a constexpr constructor to ensure that
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// the object doesn't need dynamic initialization. The object is accessed
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// before the dynamic linker has relocated itself.
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constexpr libc_shared_globals() {}
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FdTable fd_table;
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// When the linker is invoked on a binary (e.g. `linker64 /system/bin/date`),
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// record the number of arguments passed to the linker itself rather than to
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// the program it's loading. Typically 0, sometimes 1.
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int initial_linker_arg_count = 0;
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ElfW(auxv_t)* auxv = nullptr;
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pthread_mutex_t abort_msg_lock = PTHREAD_MUTEX_INITIALIZER;
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abort_msg_t* abort_msg = nullptr;
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StaticTlsLayout static_tls_layout;
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TlsModules tls_modules;
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BionicAllocator tls_allocator;
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// Values passed from libc.so to the loader.
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void (*load_hook)(ElfW(Addr) base, const ElfW(Phdr)* phdr, ElfW(Half) phnum) = nullptr;
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void (*unload_hook)(ElfW(Addr) base, const ElfW(Phdr)* phdr, ElfW(Half) phnum) = nullptr;
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void (*set_target_sdk_version_hook)(int target) = nullptr;
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// Values passed from the linker to libc.so.
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const char* init_progname = nullptr;
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char** init_environ = nullptr;
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const gwp_asan::AllocatorState* gwp_asan_state = nullptr;
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const gwp_asan::AllocationMetadata* gwp_asan_metadata = nullptr;
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const char* scudo_stack_depot = nullptr;
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const char* scudo_region_info = nullptr;
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const char* scudo_ring_buffer = nullptr;
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HeapTaggingLevel initial_heap_tagging_level = M_HEAP_TAGGING_LEVEL_NONE;
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};
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__LIBC_HIDDEN__ libc_shared_globals* __libc_shared_globals();
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__LIBC_HIDDEN__ void __libc_init_fdsan();
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__LIBC_HIDDEN__ void __libc_init_fdtrack();
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__LIBC_HIDDEN__ void __libc_init_profiling_handlers();
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__LIBC_HIDDEN__ void __libc_init_malloc(libc_globals* globals);
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__LIBC_HIDDEN__ void __libc_init_setjmp_cookie(libc_globals* globals);
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__LIBC_HIDDEN__ void __libc_init_vdso(libc_globals* globals);
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#if defined(__i386__)
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__LIBC_HIDDEN__ extern void* __libc_sysinfo;
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extern "C" __LIBC_HIDDEN__ void __libc_int0x80();
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__LIBC_HIDDEN__ void __libc_init_sysinfo();
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#endif
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#endif
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