108 lines
3.2 KiB
C
108 lines
3.2 KiB
C
/* $NetBSD: syscallvar.h,v 1.11 2015/09/24 14:34:22 christos Exp $ */
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/*-
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* Copyright (c) 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software developed for The NetBSD Foundation
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* by Andrew Doran.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_SYSCALLVAR_H_
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#define _SYS_SYSCALLVAR_H_
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#ifndef _KERNEL
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#error nothing of interest to userspace here
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#endif
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#if defined(_KERNEL) && defined(_KERNEL_OPT)
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#include "opt_dtrace.h"
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#endif
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#include <sys/systm.h>
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#include <sys/proc.h>
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extern struct emul emul_netbsd;
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struct syscall_package {
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u_short sp_code;
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u_short sp_flags;
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sy_call_t *sp_call;
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};
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void syscall_init(void);
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int syscall_establish(const struct emul *, const struct syscall_package *);
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int syscall_disestablish(const struct emul *, const struct syscall_package *);
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static inline int
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sy_call(const struct sysent *sy, struct lwp *l, const void *uap,
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register_t *rval)
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{
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int error;
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l->l_sysent = sy;
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error = (*sy->sy_call)(l, uap, rval);
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l->l_sysent = NULL;
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return error;
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}
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static inline int
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sy_invoke(const struct sysent *sy, struct lwp *l, const void *uap,
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register_t *rval, int code)
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{
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const bool do_trace = l->l_proc->p_trace_enabled &&
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(sy->sy_flags & SYCALL_INDIRECT) == 0;
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int error;
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#ifdef KDTRACE_HOOKS
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#define KDTRACE_ENTRY(a) (a)
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#else
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#define KDTRACE_ENTRY(a) (0)
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#endif
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if (__predict_true(!(do_trace || KDTRACE_ENTRY(sy->sy_entry)))
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|| (error = trace_enter(code, sy, uap)) == 0) {
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rval[0] = 0;
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#if !defined(__mips__) && !defined(__m68k__)
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/*
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* Due to the mips userland code for SYS_break needing v1 to be
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* preserved, we can't clear this on mips.
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*/
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rval[1] = 0;
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#endif
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error = sy_call(sy, l, uap, rval);
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}
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if (__predict_false(do_trace || KDTRACE_ENTRY(sy->sy_return))) {
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trace_exit(code, sy, uap, rval, error);
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}
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return error;
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}
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/* inclusion in the kernel currently depends on SYSCALL_DEBUG */
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extern const char * const syscallnames[];
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extern const char * const altsyscallnames[];
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#endif /* _SYS_SYSCALLVAR_H_ */
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