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/* $OpenBSD: namespace.h,v 1.15 2019/11/25 22:57:28 guenther Exp $ */
#ifndef _LIBC_NAMESPACE_H_
#define _LIBC_NAMESPACE_H_
/*
* Copyright (c) 2015 Philip Guenther <guenther@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* For explanations of how to use these, see README
* For explanations of why we use them and how they work, see DETAILS
*/
#include <sys/cdefs.h> /* for __dso_hidden and __{weak,strong}_alias */
#define __dso_protected __attribute__((__visibility__("protected")))
#define HIDDEN(x) _libc_##x
#define CANCEL(x) _libc_##x##_cancel
#define WRAP(x) _libc_##x##_wrap
#define HIDDEN_STRING(x) "_libc_" __STRING(x)
#define CANCEL_STRING(x) "_libc_" __STRING(x) "_cancel"
#define WRAP_STRING(x) "_libc_" __STRING(x) "_wrap"
#define PROTO_NORMAL(x) __dso_hidden typeof(x) x asm(HIDDEN_STRING(x))
#define PROTO_STD_DEPRECATED(x) typeof(x) x __attribute__((deprecated))
#define PROTO_DEPRECATED(x) typeof(x) x __attribute__((deprecated, weak))
#define PROTO_CANCEL(x) __dso_hidden typeof(x) HIDDEN(x), \
x asm(CANCEL_STRING(x))
#define PROTO_WRAP(x) PROTO_NORMAL(x), WRAP(x)
#define PROTO_PROTECTED(x) __dso_protected typeof(x) x
#define DEF_STRONG(x) __strong_alias(x, HIDDEN(x))
#define DEF_WEAK(x) __weak_alias(x, HIDDEN(x))
#define DEF_CANCEL(x) __weak_alias(x, CANCEL(x))
#define DEF_WRAP(x) __weak_alias(x, WRAP(x))
#define DEF_SYS(x) __strong_alias(_thread_sys_##x, HIDDEN(x))
#if !defined(__clang__) && __GNUC__ != 3
/* our gcc 4.2 handles redirecting builtins via PROTO_NORMAL()'s asm() label */
#define DEF_BUILTIN(x) DEF_STRONG(x)
#define BUILTIN
#else
/*
* clang and gcc can't redirect builtins via asm() labels, so mark
* them protected instead.
*/
#define DEF_BUILTIN(x) __asm("")
#define BUILTIN __dso_protected
#endif
#define MAKE_CLONE(dst, src) __dso_hidden typeof(dst) HIDDEN(dst) \
__attribute__((alias (HIDDEN_STRING(src))))
#define __relro __attribute__((section(".data.rel.ro")))
/*
* gcc and clang will generate calls to the functions below.
* Declare and redirect them here so we always go
* directly to our hidden aliases.
*/
#include <sys/_types.h>
BUILTIN void *memmove(void *, const void *, __size_t);
BUILTIN void *memcpy(void *__restrict, const void *__restrict, __size_t);
BUILTIN void *memset(void *, int, __size_t);
BUILTIN void __stack_smash_handler(const char [], int __unused);
#if !defined(__clang__) && __GNUC__ != 3
PROTO_NORMAL(memmove);
PROTO_NORMAL(memcpy);
PROTO_NORMAL(memset);
PROTO_NORMAL(__stack_smash_handler);
#endif
#undef BUILTIN
#endif /* _LIBC_NAMESPACE_H_ */
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