127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $OpenBSD: SYS.h,v 1.28 2023/12/10 16:45:51 deraadt Exp $
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*/
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#include "DEFS.h"
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#include <sys/syscall.h>
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#define TCB_OFFSET_ERRNO 16
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/*
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* Design note:
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*
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* System calls entry points are really named _thread_sys_{syscall},
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* and weakly aliased to the name {syscall}. This allows the thread
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* library to replace system calls at link time.
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*/
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/* Use both _thread_sys_{syscall} and [weak] {syscall}. */
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#define SYSENTRY(x) \
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ENTRY(_thread_sys_##x); \
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WEAK_ALIAS(x, _thread_sys_##x)
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#define SYSENTRY_HIDDEN(x) \
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ENTRY(_thread_sys_ ## x)
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#define __END_HIDDEN(x) END(_thread_sys_ ## x); \
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_HIDDEN_FALIAS(x,_thread_sys_ ## x); \
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END(_HIDDEN(x))
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#define __END(x) __END_HIDDEN(x); END(x)
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#define __DO_SYSCALL(x) \
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movl $(SYS_ ## x),%eax; \
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97: int $0x80; \
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PINSYSCALL(SYS_ ## x, 97b)
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#define SET_ERRNO() \
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movl %eax,%gs:(TCB_OFFSET_ERRNO); \
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movl $-1, %eax; \
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movl $-1, %edx /* for lseek */
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#define HANDLE_ERRNO() \
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jnc 99f; \
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SET_ERRNO(); \
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99:
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/* perform a syscall */
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#define _SYSCALL_NOERROR(x,y) \
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SYSENTRY(x); \
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__DO_SYSCALL(y);
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#define _SYSCALL_HIDDEN_NOERROR(x,y) \
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SYSENTRY_HIDDEN(x); \
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__DO_SYSCALL(y);
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#define SYSCALL_NOERROR(x) \
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_SYSCALL_NOERROR(x,x)
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/* perform a syscall, set errno */
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#define _SYSCALL(x,y) \
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.text; \
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.align 2; \
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_SYSCALL_NOERROR(x,y) \
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HANDLE_ERRNO()
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#define _SYSCALL_HIDDEN(x,y) \
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.text; \
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.align 2; \
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_SYSCALL_HIDDEN_NOERROR(x,y) \
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HANDLE_ERRNO()
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#define SYSCALL(x) \
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_SYSCALL(x,x)
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#define SYSCALL_HIDDEN(x) \
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_SYSCALL_HIDDEN(x,y)
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/* perform a syscall, return */
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#define PSEUDO_NOERROR(x,y) \
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_SYSCALL_NOERROR(x,y); \
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ret; \
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__END(x)
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/* perform a syscall, set errno, return */
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#define PSEUDO(x,y) \
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_SYSCALL(x,y); \
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ret; \
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__END(x)
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#define PSEUDO_HIDDEN(x,y) \
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_SYSCALL_HIDDEN(x,y); \
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ret; \
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__END_HIDDEN(x)
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/* perform a syscall with the same name, set errno, return */
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#define RSYSCALL(x) \
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PSEUDO(x,x);
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#define RSYSCALL_HIDDEN(x) \
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PSEUDO_HIDDEN(x,x)
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#define SYSCALL_END(x) __END(x)
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#define SYSCALL_END_HIDDEN(x) \
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__END_HIDDEN(x)
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