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/* $OpenBSD: SYS.h,v 1.3 2021/05/04 04:26:00 drahn Exp $ */
/*-
* Copyright (c) 2020 Brian Bamsch <bbamsch@google.com>
* 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.
*
* from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
*/
#include "DEFS.h"
#include <sys/syscall.h>
/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define TCB_OFFSET_ERRNO (-12)
/* offset of errno from tp */
#define TP_OFFSET_ERRNO TCB_OFFSET_ERRNO
#define SYSENTRY(x) \
.weak _C_LABEL(x); \
_C_LABEL(x) = _C_LABEL(_thread_sys_ ## x); \
ENTRY(_thread_sys_ ## x)
#define SYSENTRY_HIDDEN(x) \
ENTRY(_thread_sys_ ## x)
#define __END_HIDDEN(x) \
END(_thread_sys_ ## x); \
_HIDDEN_FALIAS(x, _thread_sys_ ## x); \
END(_HIDDEN(x))
#define __END(x) \
__END_HIDDEN(x); END(x)
#define SYSTRAP(x) \
li t0, SYS_ ## x; \
ecall
#define HANDLE_ERROR() \
beqz t0, 200f; \
sw a0, TP_OFFSET_ERRNO(tp); \
li a0, -1; \
200:
#define HANDLE_ERROR_TARGET(target) \
beqz t0, 200f; \
sw a0, TP_OFFSET_ERRNO(tp); \
li a0, -1; \
j target; \
200:
#define _SYSCALL_NOERROR(x,y) \
SYSENTRY(x); \
SYSTRAP(y)
#define _SYSCALL_HIDDEN_NOERROR(x,y) \
SYSENTRY_HIDDEN(x); \
SYSTRAP(y)
#define _SYSCALL(x, y) \
_SYSCALL_NOERROR(x,y); \
HANDLE_ERROR() \
#define _SYSCALL_HIDDEN(x, y) \
_SYSCALL_HIDDEN_NOERROR(x,y); \
HANDLE_ERROR() \
#define SYSCALL_NOERROR(x) \
_SYSCALL_NOERROR(x,x)
#define SYSCALL(x) \
_SYSCALL(x,x)
#define PSEUDO_NOERROR(x,y) \
SYSENTRY(x); \
RETGUARD_SETUP(x, t6); \
SYSTRAP(y); \
RETGUARD_CHECK(x, t6); \
ret; \
__END(x)
#define PSEUDO(x,y) \
SYSENTRY(x); \
RETGUARD_SETUP(x, t6); \
SYSTRAP(y); \
HANDLE_ERROR(); \
RETGUARD_CHECK(x, t6); \
ret; \
__END(x)
#define PSEUDO_HIDDEN(x,y) \
SYSENTRY_HIDDEN(x); \
RETGUARD_SETUP(x, t6); \
SYSTRAP(y); \
HANDLE_ERROR(); \
RETGUARD_CHECK(x, t6); \
ret; \
__END_HIDDEN(x)
#define RSYSCALL_NOERROR(x) \
PSEUDO_NOERROR(x,x)
#define RSYSCALL(x) \
PSEUDO(x,x)
#define RSYSCALL_HIDDEN(x) \
PSEUDO_HIDDEN(x,x)
#define SYSCALL_END(x) \
__END(x)
#define SYSCALL_END_HIDDEN(x) \
__END_HIDDEN(x)
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