Blame sysdeps/mach/i386/syscall.S

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/* Copyright (C) 1993-2018 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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ENTRY (syscall)
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	popl %ecx		/* Pop return address into %ecx.  */
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	popl %eax		/* Pop syscall number into %eax.  */
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	pushl %ecx		/* Push back return address.  */
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	.byte 0x9a, 0, 0, 0, 0, 7, 0 /* lcall $7, $0 -- gas bug */
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	popl %ecx		/* Pop return address into %ecx.  */
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	pushl $0		/* Push back dumb syscall number.  */
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	pushl %ecx		/* Push back return address.  */
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	ret
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END (syscall)