110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/* $NetBSD: sys_syscall.c,v 1.15 2022/06/29 16:33:09 hannken Exp $ */
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/*-
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* Copyright (c) 2006 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 contributed to The NetBSD Foundation
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* by David Laight.
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sys_syscall.c,v 1.15 2022/06/29 16:33:09 hannken Exp $");
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#include <sys/syscall_stats.h>
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#include <sys/syscallvar.h>
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/*
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* MI indirect system call support.
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* Included from sys_indirect.c and compat/netbsd32/netbsd32_indirect.c
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*
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* SYS_SYSCALL is set to the required function name.
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*/
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#define CONCAT(a,b) __CONCAT(a,b)
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static void
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CONCAT(SYS_SYSCALL, _biglockcheck)(struct proc *p, int code)
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{
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#ifdef DIAGNOSTIC
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kpreempt_disable(); /* make curcpu() stable */
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KASSERTMSG(curcpu()->ci_biglock_count == 0,
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"syscall %ld of emul %s leaked %d kernel locks",
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(long)code, p->p_emul->e_name, curcpu()->ci_biglock_count);
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kpreempt_enable();
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#endif
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}
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int
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SYS_SYSCALL(struct lwp *l, const struct CONCAT(SYS_SYSCALL, _args) *uap,
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register_t *rval)
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{
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/* {
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syscallarg(int) code;
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syscallarg(register_t) args[SYS_MAXSYSARGS];
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} */
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const struct sysent *callp;
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struct proc *p = l->l_proc;
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int code;
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int error;
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#ifdef NETBSD32_SYSCALL
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register_t args64[SYS_MAXSYSARGS];
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int i, narg;
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#define TRACE_ARGS args64
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#else
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#define TRACE_ARGS &SCARG(uap, args[0])
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#endif
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callp = p->p_emul->e_sysent;
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code = SCARG(uap, code) & (SYS_NSYSENT - 1);
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SYSCALL_COUNT(syscall_counts, code);
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callp += code;
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if (__predict_false(callp->sy_flags & SYCALL_INDIRECT))
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return ENOSYS;
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if (__predict_true(!p->p_trace_enabled)) {
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error = sy_call(callp, l, &uap->args, rval);
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CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
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return error;
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}
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#ifdef NETBSD32_SYSCALL
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narg = callp->sy_narg;
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for (i = 0; i < narg; i++)
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args64[i] = SCARG(uap, args[i]);
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#endif
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error = trace_enter(code, callp, TRACE_ARGS);
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if (__predict_true(error == 0))
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error = sy_call(callp, l, &uap->args, rval);
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trace_exit(code, callp, &uap->args, rval, error);
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CONCAT(SYS_SYSCALL, _biglockcheck)(p, code);
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return error;
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#undef TRACE_ARGS
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}
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