1 /* System-specific settings for dynamic linker code. i386 version. 2 Copyright (C) 2002-2021 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 5 The GNU C Library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 The GNU C Library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with the GNU C Library; if not, see 17 <https://www.gnu.org/licenses/>. */ 18 19 #ifndef _LINUX_I386_DL_SYSDEP_H 20 21 #include_next <dl-sysdep.h> 22 23 /* Traditionally system calls have been made using int $0x80. A 24 second method was introduced which, if possible, will use the 25 sysenter/syscall instructions. To signal the presence and where to 26 find the code the kernel passes an AT_SYSINFO value in the 27 auxiliary vector to the application. */ 28 #define NEED_DL_SYSINFO 1 29 30 #ifndef __ASSEMBLER__ 31 extern void _dl_sysinfo_int80 (void) attribute_hidden; 32 # define DL_SYSINFO_DEFAULT (uintptr_t) _dl_sysinfo_int80 33 # define DL_SYSINFO_IMPLEMENTATION \ 34 asm (".text\n\t" \ 35 ".type _dl_sysinfo_int80,@function\n\t" \ 36 ".hidden _dl_sysinfo_int80\n" \ 37 CFI_STARTPROC "\n" \ 38 "_dl_sysinfo_int80:\n\t" \ 39 "int $0x80;\n\t" \ 40 "ret;\n\t" \ 41 CFI_ENDPROC "\n" \ 42 ".size _dl_sysinfo_int80,.-_dl_sysinfo_int80\n\t" \ 43 ".previous"); 44 #endif 45 46 #endif /* dl-sysdep.h */ 47