1 /* $NetBSD: netbsd32_machdep_13.c,v 1.5 2023/12/20 06:36:01 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Frank van der Linden for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38 #include <sys/cdefs.h>
39 __KERNEL_RCSID(0, "$NetBSD: netbsd32_machdep_13.c,v 1.5 2023/12/20 06:36:01 thorpej Exp $");
40
41 #ifdef _KERNEL_OPT
42 #include "opt_compat_netbsd.h"
43 #include "opt_execfmt.h"
44 #include "opt_mtrr.h"
45 #endif
46
47 #include <sys/param.h>
48 #include <sys/exec.h>
49 #include <sys/exec_aout.h>
50 #include <sys/kmem.h>
51 #include <sys/proc.h>
52 #include <sys/signalvar.h>
53 #include <sys/systm.h>
54 #include <sys/core.h>
55 #include <sys/mount.h>
56 #include <sys/buf.h>
57 #include <sys/vnode.h>
58 #include <sys/ras.h>
59 #include <sys/ptrace.h>
60 #include <sys/kauth.h>
61
62 #include <x86/fpu.h>
63 #include <x86/dbregs.h>
64 #include <machine/frame.h>
65 #include <machine/reg.h>
66 #include <machine/vmparam.h>
67 #ifdef MTRR
68 #include <machine/mtrr.h>
69 #endif
70 #include <machine/netbsd32_machdep.h>
71 #include <machine/sysarch.h>
72 #include <machine/userret.h>
73
74 #include <compat/netbsd32/netbsd32.h>
75 #include <compat/netbsd32/netbsd32_exec.h>
76 #include <compat/netbsd32/netbsd32_syscallargs.h>
77
78 #include <compat/sys/signal.h>
79 #include <compat/sys/signalvar.h>
80
81 int check_sigcontext32(struct lwp *, const struct netbsd32_sigcontext *);
82
83 int
compat_13_netbsd32_sigreturn(struct lwp * l,const struct compat_13_netbsd32_sigreturn_args * uap,register_t * retval)84 compat_13_netbsd32_sigreturn(struct lwp *l, const struct compat_13_netbsd32_sigreturn_args *uap, register_t *retval)
85 {
86 /* {
87 syscallarg(struct netbsd32_sigcontext13 *) sigcntxp;
88 } */
89 struct proc *p = l->l_proc;
90 struct netbsd32_sigcontext13 *scp, context;
91 struct trapframe *tf;
92 sigset_t mask;
93 int error;
94
95 /*
96 * The trampoline code hands us the context.
97 * It is unsafe to keep track of it ourselves, in the event that a
98 * program jumps out of a signal handler.
99 */
100 scp = (struct netbsd32_sigcontext13 *)NETBSD32PTR64(SCARG(uap, sigcntxp));
101 if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
102 return (EFAULT);
103
104 /* Restore register context. */
105 tf = l->l_md.md_regs;
106
107 /*
108 * Check for security violations.
109 */
110 error = check_sigcontext32(l, (const struct netbsd32_sigcontext *)&context);
111 if (error != 0)
112 return error;
113
114 tf->tf_gs = context.sc_gs & 0xFFFF;
115 tf->tf_fs = context.sc_fs & 0xFFFF;
116 tf->tf_es = context.sc_es & 0xFFFF;
117 tf->tf_ds = context.sc_ds & 0xFFFF;
118 tf->tf_rflags = context.sc_eflags;
119 tf->tf_rdi = context.sc_edi;
120 tf->tf_rsi = context.sc_esi;
121 tf->tf_rbp = context.sc_ebp;
122 tf->tf_rbx = context.sc_ebx;
123 tf->tf_rdx = context.sc_edx;
124 tf->tf_rcx = context.sc_ecx;
125 tf->tf_rax = context.sc_eax;
126 tf->tf_rip = context.sc_eip;
127 tf->tf_cs = context.sc_cs & 0xFFFF;
128 tf->tf_rsp = context.sc_esp;
129 tf->tf_ss = context.sc_ss & 0xFFFF;
130
131 mutex_enter(p->p_lock);
132 /* Restore signal stack. */
133 if (context.sc_onstack & SS_ONSTACK)
134 l->l_sigstk.ss_flags |= SS_ONSTACK;
135 else
136 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
137 /* Restore signal mask. */
138 native_sigset13_to_sigset((sigset13_t *)&context.sc_mask, &mask);
139 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
140 mutex_exit(p->p_lock);
141
142 return (EJUSTRETURN);
143 }
144
145 void
netbsd32_machdep_md_13_init(void)146 netbsd32_machdep_md_13_init(void)
147 {
148
149 /* Nothing to do */
150 }
151
152 void
netbsd32_machdep_md_13_fini(void)153 netbsd32_machdep_md_13_fini(void)
154 {
155
156 /* Nothing to do */
157 }
158