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/* $OpenBSD: SYS.h,v 1.16 2016/05/07 19:05:22 guenther Exp $ */
/*-
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* 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.
*
* @(#)SYS.h 8.1 (Berkeley) 6/4/93
*
* from: Header: SYS.h,v 1.2 92/07/03 18:57:00 torek Exp
* $NetBSD: SYS.h,v 1.6 2001/07/23 07:26:50 thorpej Exp $
*/
#include <machine/asm.h>
#include <sys/syscall.h>
#include <machine/trap.h>
/* offsetof(struct tib, tib_errno) - offsetof(struct tib, __tib_tcb) */
#define TCB_OFFSET_ERRNO 24
#define _CAT(x,y) x##y
#define __ENTRY(p,x) ENTRY(_CAT(p,x)) ; .weak x; x = _CAT(p,x)
#define __ENTRY_HIDDEN(p,x) ENTRY(_CAT(p,x))
/*
* We define a hidden alias with the prefix "_libc_" for each global symbol
* that may be used internally. By referencing _libc_x instead of x, other
* parts of libc prevent overriding by the application and avoid unnecessary
* relocations.
*/
#define _HIDDEN(x) _libc_##x
#define _HIDDEN_ALIAS(x,y) \
STRONG_ALIAS(_HIDDEN(x),y); \
.hidden _HIDDEN(x)
#define _HIDDEN_FALIAS(x,y) \
_HIDDEN_ALIAS(x,y); \
.type _HIDDEN(x),@function
/*
* For functions implemented in ASM that aren't syscalls.
* END_STRONG(x) Like DEF_STRONG() in C; for standard/reserved C names
* END_WEAK(x) Like DEF_WEAK() in C; for non-ISO C names
*/
#define END_STRONG(x) END(x); _HIDDEN_FALIAS(x,x); END(_HIDDEN(x))
#define END_WEAK(x) END_STRONG(x); .weak x
#define __END_HIDDEN(p,x) END(_CAT(p,x)); \
_HIDDEN_FALIAS(x, _CAT(p,x)); \
END(_HIDDEN(x))
#define __END(p,x) __END_HIDDEN(p,x); END(x)
/*
* ERROR sets the thread's errno and returns
*/
#define ERROR() \
st %o0, [%g7 + TCB_OFFSET_ERRNO]; \
retl; \
mov -1, %o0
/*
* SYSCALL is used when further action must be taken before returning.
* Note that it adds a `nop' over what we could do, if we only knew what
* came at label 1....
*/
#define _SYSCALL(p,x,y) \
__ENTRY(p,x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
#define _SYSCALL_HIDDEN(p,x,y) \
__ENTRY_HIDDEN(p,x); mov _CAT(SYS_,y),%g1; t ST_SYSCALL; bcc 1f; nop; ERROR(); 1:
#define __SYSCALL(p,x) \
_SYSCALL(p,x,x)
#define __SYSCALL_HIDDEN(p,x) \
_SYSCALL_HIDDEN(p,x,x)
/*
* RSYSCALL is used when the system call should just return. Here
* we use the SYSCALL_G2RFLAG to put the `success' return address in %g2
* and avoid a branch.
*/
#define __RSYSCALL(p,x) \
__ENTRY(p,x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; \
add %o7,8,%g2; t ST_SYSCALL; ERROR(); __END(p,x)
#define __RSYSCALL_HIDDEN(p,x) \
__ENTRY_HIDDEN(p,x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; \
add %o7,8,%g2; t ST_SYSCALL; ERROR(); __END_HIDDEN(p,x)
/*
* PSEUDO(x,y) is like RSYSCALL(y) except that the name is x.
*/
#define __PSEUDO(p,x,y) \
__ENTRY(p,x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
t ST_SYSCALL; ERROR(); __END(p,x)
/*
* SYSCALL_NOERROR is like SYSCALL, except it's used for syscalls
* that never fail.
*
* XXX - This should be optimized.
*/
#define __SYSCALL_NOERROR(p,x) \
__ENTRY(p,x); mov _CAT(SYS_,x),%g1; t ST_SYSCALL
/*
* RSYSCALL_NOERROR is like RSYSCALL, except it's used for syscalls
* that never fail.
*
* XXX - This should be optimized.
*/
#define __RSYSCALL_NOERROR(p,x) \
__ENTRY(p,x); mov (_CAT(SYS_,x))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
t ST_SYSCALL; __END(p,x)
/*
* PSEUDO_NOERROR(x,y) is like RSYSCALL_NOERROR(y) except that the name is x.
*/
#define __PSEUDO_NOERROR(p,x,y) \
__ENTRY(p,x); mov (_CAT(SYS_,y))|SYSCALL_G2RFLAG,%g1; add %o7,8,%g2; \
t ST_SYSCALL; __END(p,x)
/*
* SYSENTRY is for functions that pretend to be syscalls.
*/
#define SYSCALL(x) __SYSCALL(_thread_sys_,x)
#define RSYSCALL(x) __RSYSCALL(_thread_sys_,x)
#define RSYSCALL_HIDDEN(x) __RSYSCALL_HIDDEN(_thread_sys_,x)
#define RSYSCALL_NOERROR(x,y) __RSYSCALL_NOERROR(_thread_sys_,x,y)
#define PSEUDO(x,y) __PSEUDO(_thread_sys_,x,y)
#define PSEUDO_NOERROR(x,y) __PSEUDO_NOERROR(_thread_sys_,x,y)
#define SYSENTRY(x) __ENTRY(_thread_sys_,x)
#define SYSENTRY_HIDDEN(x) __ENTRY_HIDDEN(_thread_sys_,x)
#define SYSCALL_END(x) __END(_thread_sys_,x)
#define SYSCALL_END_HIDDEN(x) __END_HIDDEN(_thread_sys_,x)
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