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/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $OpenBSD: SYS.h,v 1.17 2011/04/04 12:42:39 guenther Exp $
*/
#include <machine/asm.h>
#include <sys/syscall.h>
/*
* Design note:
*
* System calls entry points are really named _thread_sys_{syscall},
* and weakly aliased to the name {syscall}. This allows the thread
* library to replace system calls at link time.
*/
/* Use both _thread_sys_{syscall} and [weak] {syscall}. */
#ifdef __STDC__
#define SYSENTRY(x) \
ENTRY(_thread_sys_ ## x); \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(_thread_sys_ ## x)
#else /* ! __STDC__ */
#define SYSENTRY(x) \
ENTRY(_thread_sys_/**/x); \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(_thread_sys_/**/x)
#endif /* ! __STDC__ */
#ifdef __STDC__
#define __DO_SYSCALL(x) \
movl $(SYS_ ## x),%eax; \
int $0x80
#else /* ! __STDC__ */
#define __DO_SYSCALL(x) \
movl $(SYS_/**/x),%eax; \
int $0x80
#endif /* ! __STDC__ */
#define CERROR _C_LABEL(__cerror)
#define _CERROR _C_LABEL(___cerror)
#define CURBRK _C_LABEL(__curbrk)
/* perform a syscall */
#define _SYSCALL_NOERROR(x,y) \
SYSENTRY(x); \
__DO_SYSCALL(y);
#define SYSCALL_NOERROR(x) \
_SYSCALL_NOERROR(x,x)
/* perform a syscall, set errno */
#ifdef PIC
#define _SYSCALL(x,y) \
.text; \
.align 2; \
2: PIC_PROLOGUE; \
movl PIC_GOT(CERROR), %ecx; \
PIC_EPILOGUE; \
jmp *%ecx; \
_SYSCALL_NOERROR(x,y) \
jc 2b
#else
#define _SYSCALL(x,y) \
.text; \
.align 2; \
2: \
jmp PIC_PLT(CERROR); \
_SYSCALL_NOERROR(x,y) \
jc 2b
#endif
#define SYSCALL(x) \
_SYSCALL(x,x)
/* perform a syscall, return */
#define PSEUDO_NOERROR(x,y) \
_SYSCALL_NOERROR(x,y); \
ret
/* perform a syscall, set errno, return */
#define PSEUDO(x,y) \
_SYSCALL(x,y); \
ret
/* perform a syscall with the same name, set errno, return */
#define RSYSCALL(x) \
PSEUDO(x,x);
.globl CERROR
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