1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD: stable/11/tools/test/vm86/vm86_test.c 333534 2018-05-12 11:53:49Z kib $");
34/* $Id: vm86_test.c,v 1.10 2018/05/12 11:35:58 kostik Exp kostik $ */
35
36#include <sys/param.h>
37#include <sys/mman.h>
38#include <sys/ucontext.h>
39
40#include <machine/cpufunc.h>
41#include <machine/psl.h>
42#include <machine/sysarch.h>
43#include <machine/vm86.h>
44
45#include <err.h>
46#include <signal.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50
51static u_int gs;
52
53static void
54sig_handler(int signo, siginfo_t *si __unused, void *ucp)
55{
56	ucontext_t *uc;
57	mcontext_t *mc;
58
59	uc = ucp;
60	mc = &uc->uc_mcontext;
61
62	/*
63	 * Reload pointer to the TLS base, so that malloc inside
64	 * printf() works.
65	 */
66	load_gs(gs);
67
68	printf("sig %d %%eax %#x %%ecx %#x %%eip %#x\n", signo,
69	    mc->mc_eax, mc->mc_ecx, mc->mc_eip);
70	exit(0);
71}
72
73extern char vm86_code_start[], vm86_code_end[];
74
75int
76main(void)
77{
78	ucontext_t uc;
79	struct sigaction sa;
80	struct vm86_init_args va;
81	stack_t ssa;
82	char *vm86_code;
83
84	gs = rgs();
85
86	memset(&ssa, 0, sizeof(ssa));
87	ssa.ss_size = PAGE_SIZE * 128;
88	ssa.ss_sp = mmap(NULL, ssa.ss_size, PROT_READ | PROT_WRITE |
89	    PROT_EXEC, MAP_ANON, -1, 0);
90	if (ssa.ss_sp == MAP_FAILED)
91		err(1, "mmap sigstack");
92	if (sigaltstack(&ssa, NULL) == -1)
93		err(1, "sigaltstack");
94
95	memset(&sa, 0, sizeof(sa));
96	sa.sa_sigaction = sig_handler;
97	sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
98	if (sigaction(SIGBUS, &sa, NULL) == -1)
99		err(1, "sigaction SIGBUS");
100	if (sigaction(SIGSEGV, &sa, NULL) == -1)
101		err(1, "sigaction SIGSEGV");
102	if (sigaction(SIGILL, &sa, NULL) == -1)
103		err(1, "sigaction SIGILL");
104
105	vm86_code = mmap((void *)0x10000, PAGE_SIZE, PROT_READ | PROT_WRITE |
106	    PROT_EXEC, MAP_ANON | MAP_FIXED, -1, 0);
107	if (vm86_code == MAP_FAILED)
108		err(1, "mmap");
109	memcpy(vm86_code, vm86_code_start, vm86_code_end - vm86_code_start);
110
111	memset(&va, 0, sizeof(va));
112	if (i386_vm86(VM86_INIT, &va) == -1)
113		err(1, "VM86_INIT");
114
115	memset(&uc, 0, sizeof(uc));
116	uc.uc_mcontext.mc_ecx = 0x2345;
117	uc.uc_mcontext.mc_eflags = PSL_VM | PSL_USER;
118	uc.uc_mcontext.mc_cs = uc.uc_mcontext.mc_ds = uc.uc_mcontext.mc_es =
119	    uc.uc_mcontext.mc_ss = (uintptr_t)vm86_code >> 4;
120	uc.uc_mcontext.mc_esp = 0xfffe;
121	sigreturn(&uc);
122}
123