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
46 lines
1.7 KiB
ArmAsm
46 lines
1.7 KiB
ArmAsm
/*
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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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#include "asm_multiarch.h"
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#if defined(__aarch64__)
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#include <private/bionic_asm_arm64.h>
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__bionic_asm_custom_note_gnu_section()
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#endif
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.section .note.GNU-stack, "", %progbits
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#if !defined(__arm__)
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.section .eh_frame, "a", @progbits
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.balign 4
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.type __FRAME_END__, @object
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.size __FRAME_END__, 4
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__FRAME_END__:
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.zero 4
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#endif
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