Blame sysdeps/unix/sysv/linux/i386/libc-do-syscall.S

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/* Out-of-line syscall stub for six-argument syscalls from C.
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   Copyright (C) 2015-2018 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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#ifndef OPTIMIZE_FOR_GCC_5
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/* %eax, %ecx, %edx and %esi contain the values expected by the kernel.
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   %edi points to a structure with the values of %ebx, %edi and %ebp.  */
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	.hidden __libc_do_syscall
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ENTRY (__libc_do_syscall)
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	pushl	%ebx
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	cfi_adjust_cfa_offset (4)
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	cfi_rel_offset (ebx, 0)
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	pushl	%edi
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	cfi_adjust_cfa_offset (4)
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	cfi_rel_offset (edi, 0)
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	pushl	%ebp
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	cfi_adjust_cfa_offset (4)
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	cfi_rel_offset (ebp, 0)
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	movl	0(%edi), %ebx
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	movl	8(%edi), %ebp
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	movl	4(%edi), %edi
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	ENTER_KERNEL
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	popl	%ebp
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	cfi_adjust_cfa_offset (-4)
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	cfi_restore (ebp)
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	popl	%edi
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	cfi_adjust_cfa_offset (-4)
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	cfi_restore (edi)
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	popl	%ebx
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	cfi_adjust_cfa_offset (-4)
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	cfi_restore (ebx)
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	ret
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END (__libc_do_syscall)
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#endif