1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2018 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Konstantin Belousov <kib@FreeBSD.org>
8 * under sponsorship from the FreeBSD Foundation.
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 /* $Id: vm86_test.c,v 1.10 2018/05/12 11:35:58 kostik Exp kostik $ */
34
35 #include <sys/param.h>
36 #include <sys/mman.h>
37 #include <sys/ucontext.h>
38
39 #include <machine/cpufunc.h>
40 #include <machine/psl.h>
41 #include <machine/sysarch.h>
42 #include <machine/vm86.h>
43
44 #include <err.h>
45 #include <signal.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49
50 static u_int gs;
51
52 static void
sig_handler(int signo,siginfo_t * si __unused,void * ucp)53 sig_handler(int signo, siginfo_t *si __unused, void *ucp)
54 {
55 ucontext_t *uc;
56 mcontext_t *mc;
57
58 uc = ucp;
59 mc = &uc->uc_mcontext;
60
61 /*
62 * Reload pointer to the TLS base, so that malloc inside
63 * printf() works.
64 */
65 load_gs(gs);
66
67 printf("sig %d %%eax %#x %%ecx %#x %%eip %#x\n", signo,
68 mc->mc_eax, mc->mc_ecx, mc->mc_eip);
69 exit(0);
70 }
71
72 extern char vm86_code_start[], vm86_code_end[];
73
74 int
main(void)75 main(void)
76 {
77 ucontext_t uc;
78 struct sigaction sa;
79 struct vm86_init_args va;
80 stack_t ssa;
81 char *vm86_code;
82
83 gs = rgs();
84
85 memset(&ssa, 0, sizeof(ssa));
86 ssa.ss_size = PAGE_SIZE * 128;
87 ssa.ss_sp = mmap(NULL, ssa.ss_size, PROT_READ | PROT_WRITE |
88 PROT_EXEC, MAP_ANON, -1, 0);
89 if (ssa.ss_sp == MAP_FAILED)
90 err(1, "mmap sigstack");
91 if (sigaltstack(&ssa, NULL) == -1)
92 err(1, "sigaltstack");
93
94 memset(&sa, 0, sizeof(sa));
95 sa.sa_sigaction = sig_handler;
96 sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
97 if (sigaction(SIGBUS, &sa, NULL) == -1)
98 err(1, "sigaction SIGBUS");
99 if (sigaction(SIGSEGV, &sa, NULL) == -1)
100 err(1, "sigaction SIGSEGV");
101 if (sigaction(SIGILL, &sa, NULL) == -1)
102 err(1, "sigaction SIGILL");
103
104 vm86_code = mmap((void *)0x10000, PAGE_SIZE, PROT_READ | PROT_WRITE |
105 PROT_EXEC, MAP_ANON | MAP_FIXED, -1, 0);
106 if (vm86_code == MAP_FAILED)
107 err(1, "mmap");
108 memcpy(vm86_code, vm86_code_start, vm86_code_end - vm86_code_start);
109
110 memset(&va, 0, sizeof(va));
111 if (i386_vm86(VM86_INIT, &va) == -1)
112 err(1, "VM86_INIT");
113
114 memset(&uc, 0, sizeof(uc));
115 uc.uc_mcontext.mc_ecx = 0x2345;
116 uc.uc_mcontext.mc_eflags = PSL_VM | PSL_USER;
117 uc.uc_mcontext.mc_cs = uc.uc_mcontext.mc_ds = uc.uc_mcontext.mc_es =
118 uc.uc_mcontext.mc_ss = (uintptr_t)vm86_code >> 4;
119 uc.uc_mcontext.mc_esp = 0xfffe;
120 sigreturn(&uc);
121 }
122