133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/* $FreeBSD$ */
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/* From: NetBSD: SYS.h,v 1.5 1997/05/02 18:15:15 kleink Exp */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <machine/asm.h>
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#ifdef __NETBSD_SYSCALLS
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#include <sys/netbsd_syscall.h>
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#else
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#include <sys/syscall.h>
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#endif
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#define CALLSYS_ERROR(name) \
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CALLSYS_NOERROR(name); \
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br gp, LLABEL(name,0); \
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LLABEL(name,0): \
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LDGP(gp); \
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beq a3, LLABEL(name,1); \
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jmp zero, .cerror; \
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LLABEL(name,1):
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#define SYSCALL(name) \
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LEAF(__CONCAT(_,name),0); /* XXX # of args? */ \
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WEAK_ALIAS(name, __CONCAT(_,name)); \
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CALLSYS_ERROR(name)
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#define SYSCALL_NOERROR(name) \
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LEAF(name,0); /* XXX # of args? */ \
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CALLSYS_NOERROR(name)
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#define RSYSCALL(name) \
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SYSCALL(name); \
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RET; \
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END(__CONCAT(_,name))
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#define RSYSCALL_NOERROR(name) \
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SYSCALL_NOERROR(name); \
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RET; \
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END(name)
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#define PSEUDO(label,name) \
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LEAF(__CONCAT(_,label),0); /* XXX # of args? */ \
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WEAK_ALIAS(label, __CONCAT(_,label)); \
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CALLSYS_ERROR(name); \
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RET; \
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END(__CONCAT(_,label));
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#define PSEUDO_NOERROR(label,name) \
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LEAF(label,0); /* XXX # of args? */ \
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CALLSYS_NOERROR(name); \
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RET; \
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END(label);
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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 PCALL(name) \
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CALL(___CONCAT(_thread_sys_,name))
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#define PLEAF(name, args) \
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LEAF(___CONCAT(_thread_sys_,name),args)
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#define PEND(name) \
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END(___CONCAT(_thread_sys_,name))
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#define PSYSCALL(name) \
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PLEAF(name,0); /* XXX # of args? */ \
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CALLSYS_ERROR(name)
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#define PRSYSCALL(name) \
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PLEAF(name,0); /* XXX # of args? */ \
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CALLSYS_ERROR(name) \
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RET; \
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PEND(name)
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#define PPSEUDO(label,name) \
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PLEAF(label,0); /* XXX # of args? */ \
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CALLSYS_ERROR(name); \
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RET; \
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PEND(label)
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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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#define PLEAF(x,y) LEAF(x,y)
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#define PEND(x) END(x)
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#define PCALL(x) CALL(x)
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#endif
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