1 /* $NetBSD: netbsd32_syscall.c,v 1.34 2023/10/05 19:41:03 ad 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 1.34 2023/10/05 19:41:03 ad 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
53 void netbsd32_syscall_intern(struct proc *);
54 static void netbsd32_syscall(struct trapframe *);
55
56 void
netbsd32_syscall_intern(struct proc * p)57 netbsd32_syscall_intern(struct proc *p)
58 {
59
60 p->p_md.md_syscall = netbsd32_syscall;
61 }
62
63 void
netbsd32_syscall(struct trapframe * frame)64 netbsd32_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 SYSCALL_COUNT(syscall_counts, code);
83 SYSCALL_TIME_SYS_ENTRY(l, syscall_times, code);
84
85 params = (char *)frame->tf_rsp + sizeof(int);
86
87 if (callp->sy_argsize) {
88 error = copyin(params, args, callp->sy_argsize);
89 if (__predict_false(error != 0))
90 goto bad;
91 }
92
93 if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_entry))
94 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) {
95 int narg = callp->sy_argsize >> 2;
96 for (i = 0; i < narg; i++)
97 args64[i] = args[i];
98 error = trace_enter(code, callp, args64);
99 if (__predict_false(error != 0))
100 goto out;
101 }
102
103 rval[0] = 0;
104 rval[1] = 0;
105 error = sy_call(callp, l, args, rval);
106
107 out:
108 if (__predict_false(p->p_trace_enabled || KDTRACE_ENTRY(callp->sy_return))
109 && !__predict_false(callp->sy_flags & SYCALL_INDIRECT)) {
110 int narg = callp->sy_argsize >> 2;
111 for (i = 0; i < narg; i++)
112 args64[i] = args[i];
113 trace_exit(code, callp, args64, rval, error);
114 }
115
116 if (__predict_true(error == 0)) {
117 frame->tf_rax = rval[0];
118 frame->tf_rdx = rval[1];
119 frame->tf_rflags &= ~PSL_C; /* carry bit */
120 } else {
121 switch (error) {
122 case ERESTART:
123 /*
124 * The offset to adjust the PC by depends on whether we
125 * entered the kernel through the trap or call gate.
126 * We saved the instruction size in tf_err on entry.
127 */
128 frame->tf_rip -= frame->tf_err;
129 break;
130 case EJUSTRETURN:
131 /* nothing to do */
132 break;
133 default:
134 bad:
135 frame->tf_rax = error;
136 frame->tf_rflags |= PSL_C; /* carry bit */
137 break;
138 }
139 }
140
141 SYSCALL_TIME_SYS_EXIT(l);
142 userret(l);
143 }
144