d7831208b2
clang complains if you define a symbol and _then_ make it weak, rather than the other way round: /tmp/setjmp-c3c977.s:90:1: warning: sigsetjmp changed binding to STB_WEAK .weak sigsetjmp; ^ Test: treehugger Change-Id: Iee6b0ea456bb2e92aea810ce45f171caabaa89d2
113 lines
4.2 KiB
C
113 lines
4.2 KiB
C
/*
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* Copyright (C) 2013 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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/* https://github.com/android/ndk/issues/1422 */
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#include <features.h>
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#include <asm/unistd.h> /* For system call numbers. */
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#define MAX_ERRNO 4095 /* For recognizing system call error returns. */
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#define __bionic_asm_custom_entry(f)
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#define __bionic_asm_custom_end(f)
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#define __bionic_asm_function_type @function
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#define __bionic_asm_custom_note_gnu_section()
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#if defined(__aarch64__)
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#include <private/bionic_asm_arm64.h>
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#elif defined(__arm__)
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#include <private/bionic_asm_arm.h>
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#elif defined(__i386__)
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#include <private/bionic_asm_x86.h>
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#elif defined(__riscv)
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#include <private/bionic_asm_riscv64.h>
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#elif defined(__x86_64__)
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#include <private/bionic_asm_x86_64.h>
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#endif
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// Starts a normal assembler routine.
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#define ENTRY(__f) __ENTRY_WITH_BINDING(__f, .globl)
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// Starts an assembler routine with hidden visibility.
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#define ENTRY_PRIVATE(__f) \
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__ENTRY_WITH_BINDING(__f, .globl); \
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.hidden __f;
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// Starts an assembler routine that's weak so native bridges can override it.
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#define ENTRY_WEAK_FOR_NATIVE_BRIDGE(__f) __ENTRY_WITH_BINDING(__f, .weak)
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// Starts an assembler routine with hidden visibility and no DWARF information.
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// Only used for internal functions passed via sa_restorer.
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// TODO: can't we just delete all those and let the kernel do its thing?
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#define ENTRY_NO_DWARF_PRIVATE(__f) \
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__ENTRY_NO_DWARF(__f, .globl); \
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.hidden __f;
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// (Implementation detail.)
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#define __ENTRY_NO_DWARF(__f, __binding) \
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.text; \
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__binding __f; \
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.balign __bionic_asm_align; \
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.type __f, __bionic_asm_function_type; \
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__f: \
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__bionic_asm_custom_entry(__f);
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// (Implementation detail.)
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#define __ENTRY_WITH_BINDING(__f, __binding) \
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__ENTRY_NO_DWARF(__f, __binding); \
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.cfi_startproc;
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// Ends a normal assembler routine.
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#define END(__f) \
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.cfi_endproc; \
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END_NO_DWARF(__f)
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// Ends an assembler routine with no DWARF information.
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// Only used for internal functions passed via sa_restorer.
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// TODO: can't we just delete all those and let the kernel do its thing?
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#define END_NO_DWARF(__f) \
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.size __f, .- __f; \
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__bionic_asm_custom_end(__f)
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// Creates an alias `alias` for the symbol `original`.
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#define ALIAS_SYMBOL(alias, original) \
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.globl alias; \
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.equ alias, original
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// Creates an alias `alias` for the symbol `original` that's weak so it can be
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// separately overridden by native bridges.
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#define ALIAS_SYMBOL_WEAK_FOR_NATIVE_BRIDGE(alias, original) \
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.weak alias; \
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.equ alias, original
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// Adds a GNU property ELF note. Important on arm64 to declare PAC/BTI support.
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#define NOTE_GNU_PROPERTY() __bionic_asm_custom_note_gnu_section()
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// Gives local labels a more convenient and readable syntax.
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#define L(__label) .L##__label
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