95 lines
3.6 KiB
C
95 lines
3.6 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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* from: @(#)SYS.h 5.5 (Berkeley) 5/7/91
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*
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* $FreeBSD$
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*/
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#include <sys/syscall.h>
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#include "DEFS.h"
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#define SYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
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ENTRY(__CONCAT(_,x)); \
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.weak CNAME(x); \
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.set CNAME(x),CNAME(__CONCAT(_,x)); \
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lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b
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#define RSYSCALL(x) SYSCALL(x); ret
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#define PSEUDO(x,y) ENTRY(__CONCAT(_,x)); \
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.weak CNAME(x); \
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.set CNAME(x),CNAME(__CONCAT(_,x)); \
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lea __CONCAT(SYS_,y), %eax; KERNCALL; ret
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/* gas messes up offset -- although we don't currently need it, do for BCS */
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#define LCALL(x,y) .byte 0x9a ; .long y; .word x
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/*
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* Design note:
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*
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* The macros PSYSCALL() and PRSYSCALL() are intended for use where a
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* syscall needs to be renamed in the threaded library. When building
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* a normal library, they default to the traditional SYSCALL() and
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* RSYSCALL(). This avoids the need to #ifdef _THREAD_SAFE everywhere
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* that the renamed function needs to be called.
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*/
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#ifdef _THREAD_SAFE
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/*
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* For the thread_safe versions, we prepend _thread_sys_ to the function
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* name so that the 'C' wrapper can go around the real name.
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*/
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#define PSYSCALL(x) 2: PIC_PROLOGUE; jmp PIC_PLT(HIDENAME(cerror)); \
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ENTRY(__CONCAT(_thread_sys_,x)); \
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lea __CONCAT(SYS_,x),%eax; KERNCALL; jb 2b
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#define PRSYSCALL(x) PSYSCALL(x); ret
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#define PPSEUDO(x,y) ENTRY(__CONCAT(_thread_sys_,x)); \
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lea __CONCAT(SYS_,y), %eax; KERNCALL; ret
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#else
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/*
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* The non-threaded library defaults to traditional syscalls where
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* the function name matches the syscall name.
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*/
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#define PSYSCALL(x) SYSCALL(x)
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#define PRSYSCALL(x) RSYSCALL(x)
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#define PPSEUDO(x,y) PSEUDO(x,y)
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#endif
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#ifdef __ELF__
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#define KERNCALL int $0x80 /* Faster */
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#else
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#define KERNCALL LCALL(7,0) /* The old way */
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#endif
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