1/* $NetBSD: netbsd32_syscall.c,v 1.33 2015/03/07 18:41:40 christos Exp $ */
2
3/*-
4 * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Charles M. Hannum.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#if defined(_KERNEL) && defined(_KERNEL_OPT)
33#include "opt_dtrace.h"
34#endif
35
36#include <sys/cdefs.h>
37__KERNEL_RCSID(0, "$NetBSD: netbsd32_syscall.c,v 1.33 2015/03/07 18:41:40 christos Exp $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/proc.h>
42#include <sys/signal.h>
43/* XXX this file ought to include the netbsd32 version of these 2 headers */
44#include <sys/syscall.h>
45#include <sys/syscallvar.h>
46#include <sys/syscallargs.h>
47#include <sys/syscall_stats.h>
48
49#include <machine/cpu.h>
50#include <machine/psl.h>
51#include <machine/userret.h>
52
53void netbsd32_syscall_intern(struct proc *);
54static void netbsd32_syscall(struct trapframe *);
55
56void
57netbsd32_syscall_intern(struct proc *p)
58{
59
60 p->p_md.md_syscall = netbsd32_syscall;
61}
62
63void
64netbsd32_syscall(struct trapframe *frame)
65{
66 char *params;
67 const struct sysent *callp;
68 struct proc *p;
69 struct lwp *l;
70 int error;
71 int i;
72 register32_t code, args[2 + SYS_MAXSYSARGS];
73 register_t rval[2];
74 register_t args64[SYS_MAXSYSARGS];
75
76 l = curlwp;
77 p = l->l_proc;
78
79 code = frame->tf_rax & (SYS_NSYSENT - 1);
80 callp = p->p_emul->e_sysent + code;
81
82 LWP_CACHE_CREDS(l, p);
83
84 SYSCALL_COUNT(syscall_counts, code);
85 SYSCALL_TIME_SYS_ENTRY(l, syscall_times, code);
86
87 params = (char *)frame->tf_rsp + sizeof(int);
88
89 if (callp->sy_argsize) {
90 error = copyin(params, args, callp->sy_argsize);
91 if (__predict_false(error != 0))
92 goto bad;
93 }
94
95 if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry))
96 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) {
97 int narg = callp->sy_argsize >> 2;
98 for (i = 0; i < narg; i++)
99 args64[i] = args[i];
100 error = trace_enter(code, callp, args64);
101 if (__predict_false(error != 0))
102 goto out;
103 }
104
105 rval[0] = 0;
106 rval[1] = 0;
107 error = sy_call(callp, l, args, rval);
108
109out:
110 if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return))
111 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) {
112 int narg = callp->sy_argsize >> 2;
113 for (i = 0; i < narg; i++)
114 args64[i] = args[i];
115 trace_exit(code, callp, args64, rval, error);
116 }
117
118 if (__predict_true(error == 0)) {
119 frame->tf_rax = rval[0];
120 frame->tf_rdx = rval[1];
121 frame->tf_rflags &= ~PSL_C; /* carry bit */
122 } else {
123 switch (error) {
124 case ERESTART:
125 /*
126 * The offset to adjust the PC by depends on whether we
127 * entered the kernel through the trap or call gate.
128 * We saved the instruction size in tf_err on entry.
129 */
130 frame->tf_rip -= frame->tf_err;
131 break;
132 case EJUSTRETURN:
133 /* nothing to do */
134 break;
135 default:
136 bad:
137 frame->tf_rax = error;
138 frame->tf_rflags |= PSL_C; /* carry bit */
139 break;
140 }
141 }
142
143 SYSCALL_TIME_SYS_EXIT(l);
144 userret(l);
145}
146