Blame sysdeps/unix/sysv/linux/i386/dl-sysdep.h

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/* System-specific settings for dynamic linker code.  i386 version.
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   Copyright (C) 2002-2018 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, see
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   <http://www.gnu.org/licenses/>.  */
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#ifndef _LINUX_I386_DL_SYSDEP_H
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#include_next <dl-sysdep.h>
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/* Traditionally system calls have been made using int $0x80.  A
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   second method was introduced which, if possible, will use the
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   sysenter/syscall instructions.  To signal the presence and where to
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   find the code the kernel passes an AT_SYSINFO value in the
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   auxiliary vector to the application.  */
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#define NEED_DL_SYSINFO	1
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#ifndef __ASSEMBLER__
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extern void _dl_sysinfo_int80 (void) attribute_hidden;
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# define DL_SYSINFO_DEFAULT (uintptr_t) _dl_sysinfo_int80
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# define DL_SYSINFO_IMPLEMENTATION \
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  asm (".text\n\t"							      \
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       ".type _dl_sysinfo_int80,@function\n\t"				      \
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       ".hidden _dl_sysinfo_int80\n"					      \
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       CFI_STARTPROC "\n"						      \
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       "_dl_sysinfo_int80:\n\t"						      \
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       "int $0x80;\n\t"							      \
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       "ret;\n\t"							      \
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       CFI_ENDPROC "\n"							      \
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       ".size _dl_sysinfo_int80,.-_dl_sysinfo_int80\n\t"		      \
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       ".previous");
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#endif
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#endif	/* dl-sysdep.h */