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452aea842f
* sysdeps/unix/sysv/linux/i386/dl-sysdep.h (DL_SYSINFO_IMPLEMENTATION): Use CFI opcodes. * sysdeps/unix/sysv/linux/i386/i686/dl-sysdep.h (DL_SYSINFO_IMPLEMENTATION): Likewise.
65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
/* System-specific settings for dynamic linker code. IA-32 version.
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Copyright (C) 2002, 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _DL_SYSDEP_H
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#define _DL_SYSDEP_H 1
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/* This macro must be defined to either 0 or 1.
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If 1, then an errno global variable hidden in ld.so will work right with
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all the errno-using libc code compiled for ld.so, and there is never a
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need to share the errno location with libc. This is appropriate only if
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all the libc functions that ld.so uses are called without PLT and always
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get the versions linked into ld.so rather than the libc ones. */
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#ifdef IS_IN_rtld
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# define RTLD_PRIVATE_ERRNO 1
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#else
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# define RTLD_PRIVATE_ERRNO 0
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#endif
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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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sysenter/syscall is not useful on i386 through i586, but the dynamic
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linker and dl code in libc.a has to be able to load i686 compiled
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libraries. */
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#define NEED_DL_SYSINFO 1
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#undef USE_DL_SYSINFO
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#if defined NEED_DL_SYSINFO && !defined __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\t" \
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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 */
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