72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
/*
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* Copyright (C) 2019 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 <sys/cdefs.h>
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/**
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* @file sys/ifunc.h
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* @brief Declarations used for ifunc resolvers. Currently only meaningful for arm64.
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*/
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__BEGIN_DECLS
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#if defined(__aarch64__)
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/**
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* Provides information about hardware capabilities to ifunc resolvers.
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*
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* Starting with API level 30, ifunc resolvers on arm64 are passed two arguments. The first is a
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* uint64_t whose value is equal to getauxval(AT_HWCAP) | _IFUNC_ARG_HWCAP. The second is a pointer
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* to a data structure of this type. Prior to API level 30, no arguments are passed to ifunc
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* resolvers. Code that wishes to be compatible with prior API levels should not accept any
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* arguments in the resolver.
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*/
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typedef struct __ifunc_arg_t {
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/** Set to sizeof(__ifunc_arg_t). */
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unsigned long _size;
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/** Set to getauxval(AT_HWCAP). */
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unsigned long _hwcap;
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/** Set to getauxval(AT_HWCAP2). */
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unsigned long _hwcap2;
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} __ifunc_arg_t;
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/**
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* If this bit is set in the first argument to an ifunc resolver, indicates that the second argument
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* is a pointer to a data structure of type __ifunc_arg_t. This bit is always set on Android
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* starting with API level 30.
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*/
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#define _IFUNC_ARG_HWCAP (1ULL << 62)
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#endif
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__END_DECLS
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