IABSD.fr/src/lib/libc/include/namespace.h

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• Author : guenther
  Date : 2019-11-25 22:57:28
  Hash : fb832af5
  Message : gcc3, like clang and unlike our gcc4, doesn't support redirecting builtins like mem{set,cpy,move} or __stack_smash_handler using asm() renaming. So treat gcc3 like clang and mark such functions as protected instead. ok ayoma@

• lib/libc/include/namespace.h

• /*	$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_ */