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syscallvar.h
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syscallvar.h
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/* $NetBSD: syscallvar.h,v 1.12 2018/04/19 21:19:07 christos Exp $ */
/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Andrew Doran.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#ifndef _SYS_SYSCALLVAR_H_
#define _SYS_SYSCALLVAR_H_
#ifndef _KERNEL
#error nothing of interest to userspace here
#endif
#if defined(_KERNEL) && defined(_KERNEL_OPT)
#include "opt_dtrace.h"
#endif
#include <sys/systm.h>
#include <sys/proc.h>
extern struct emul emul_netbsd;
struct syscall_package {
u_short sp_code;
u_short sp_flags;
sy_call_t *sp_call;
};
void syscall_init(void);
int syscall_establish(const struct emul *, const struct syscall_package *);
int syscall_disestablish(const struct emul *, const struct syscall_package *);
static __inline int
sy_call(const struct sysent *sy, struct lwp *l, const void *uap,
register_t *rval)
{
int error;
l->l_sysent = sy;
error = (*sy->sy_call)(l, uap, rval);
l->l_sysent = NULL;
return error;
}
static __inline int
sy_invoke(const struct sysent *sy, struct lwp *l, const void *uap,
register_t *rval, int code)
{
const bool do_trace = l->l_proc->p_trace_enabled &&
(sy->sy_flags & SYCALL_INDIRECT) == 0;
int error;
#ifdef KDTRACE_HOOKS
#define KDTRACE_ENTRY(a) (a)
#else
#define KDTRACE_ENTRY(a) (0)
#endif
if (__predict_true(!(do_trace || KDTRACE_ENTRY(sy->sy_entry)))
|| (error = trace_enter(code, sy, uap)) == 0) {
rval[0] = 0;
#if !defined(__mips__) && !defined(__m68k__)
/*
* Due to the mips userland code for SYS_break needing v1 to be
* preserved, we can't clear this on mips.
*/
rval[1] = 0;
#endif
error = sy_call(sy, l, uap, rval);
}
if (__predict_false(do_trace || KDTRACE_ENTRY(sy->sy_return))) {
trace_exit(code, sy, uap, rval, error);
}
return error;
}
/* inclusion in the kernel currently depends on SYSCALL_DEBUG */
extern const char * const syscallnames[];
extern const char * const altsyscallnames[];
#endif /* _SYS_SYSCALLVAR_H_ */