glibc/sysdeps/unix/sysv/sysv4/linux/i386/syscall.S

/* Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <sysdep.h>

ASM_GLOBAL_DIRECTIVE syscall_error
ENTRY (syscall)
	popl %ecx		/* Pop return address into %ecx.  */
	popl %eax		/* Pop syscall number into %eax.  */
	pushl %ecx		/* Push back return address.  */
	DO_CALL (5)		/* Frob the args and do the system call.  */
	testl %eax, %eax	/* Check %eax for error.  */
	jl JUMPTARGET(syscall_error) /* Jump to error handler if negative.  */
	ret			/* Return to caller.  */