Blame sysdeps/unix/sysv/linux/i386/syscall.S

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/* Copyright (C) 1995-2018 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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#include <sysdep.h>
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/* Please consult the file sysdeps/unix/sysv/linux/i386/sysdep.h for
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   more information about the value -4095 used below.*/
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	.text
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ENTRY (syscall)
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	PUSHARGS_6		/* Save register contents.  */
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	_DOARGS_6(44)		/* Load arguments.  */
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	movl 20(%esp), %eax	/* Load syscall number into %eax.  */
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	ENTER_KERNEL		/* Do the system call.  */
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	POPARGS_6		/* Restore register contents.  */
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	cmpl $-4095, %eax	/* Check %eax for error.  */
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	jae SYSCALL_ERROR_LABEL	/* Jump to error handler if error.  */
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	ret			/* Return to caller.  */
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PSEUDO_END (syscall)