744cfd3720
Currently, we use sentinels (starting with -1 and ending with 0) in
preinit_array/init_array/fini_array in executables. But after using LTO,
the sentinels can be reordered by LLD and no longer work. So make below
changes to not rely on them:
1. In crtbegin.c, use symbols (like __init_array_start) inserted by the
linker.
2. Add array_count fields in structors_array_t.
3. In static libc, use array_count fields to decide array lengths.
4. To make new dynamic executables work with old libc.so, create a fake
fini_array with sentinels, and pass it to __libc_init. The fake
fini_array contains a function to call functions in real fini_array.
5. To make old dynamic executables work with new libc.so, libc.so
still uses sentinels to decide the length of fini_array.
Bug: 295944813
Bug: https://github.com/android/ndk/issues/1461
Test: run bionic-unit-tests-static
Test: test static executables manually
Test: boot cf_gwear_x86-trunk_staging-userdebug
Change-Id: I1ce31f07bcfe0e99b4237984898a8fc9e98ff426
77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/*
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* Copyright (C) 2008 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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#pragma once
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#include <stdint.h>
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#include <sys/cdefs.h>
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typedef void init_func_t(int, char*[], char*[]);
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typedef void fini_func_t(void);
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typedef struct {
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init_func_t** preinit_array;
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init_func_t** init_array;
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fini_func_t** fini_array;
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// Below fields are only available in static executables.
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size_t preinit_array_count;
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size_t init_array_count;
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size_t fini_array_count;
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} structors_array_t;
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__BEGIN_DECLS
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extern int main(int argc, char** argv, char** env);
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__noreturn void __libc_init(void* raw_args,
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void (*onexit)(void),
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int (*slingshot)(int, char**, char**),
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structors_array_t const* const structors);
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__LIBC_HIDDEN__ void __libc_fini(void* finit_array);
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__END_DECLS
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#if defined(__cplusplus)
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__LIBC_HIDDEN__ void __libc_init_globals();
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__LIBC_HIDDEN__ void __libc_init_common();
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__LIBC_HIDDEN__ void __libc_init_scudo();
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__LIBC_HIDDEN__ void __libc_init_mte_late();
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__LIBC_HIDDEN__ void __libc_init_AT_SECURE(char** envp);
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// The fork handler must be initialised after __libc_init_malloc, as
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// pthread_atfork may call malloc() during its once-init.
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__LIBC_HIDDEN__ void __libc_init_fork_handler();
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__LIBC_HIDDEN__ void __libc_set_target_sdk_version(int target);
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#endif
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