123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* $Id: vm86_test.c,v 1.10 2018/05/12 11:35:58 kostik Exp kostik $ */
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <sys/ucontext.h>
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#include <machine/cpufunc.h>
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#include <machine/psl.h>
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#include <machine/sysarch.h>
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#include <machine/vm86.h>
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#include <err.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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static u_int gs;
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static void
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sig_handler(int signo, siginfo_t *si __unused, void *ucp)
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{
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ucontext_t *uc;
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mcontext_t *mc;
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uc = ucp;
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mc = &uc->uc_mcontext;
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/*
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* Reload pointer to the TLS base, so that malloc inside
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* printf() works.
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*/
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load_gs(gs);
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printf("sig %d %%eax %#x %%ecx %#x %%eip %#x\n", signo,
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mc->mc_eax, mc->mc_ecx, mc->mc_eip);
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exit(0);
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}
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extern char vm86_code_start[], vm86_code_end[];
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int
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main(void)
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{
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ucontext_t uc;
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struct sigaction sa;
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struct vm86_init_args va;
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stack_t ssa;
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char *vm86_code;
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gs = rgs();
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memset(&ssa, 0, sizeof(ssa));
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ssa.ss_size = PAGE_SIZE * 128;
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ssa.ss_sp = mmap(NULL, ssa.ss_size, PROT_READ | PROT_WRITE |
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PROT_EXEC, MAP_ANON, -1, 0);
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if (ssa.ss_sp == MAP_FAILED)
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err(1, "mmap sigstack");
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if (sigaltstack(&ssa, NULL) == -1)
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err(1, "sigaltstack");
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = sig_handler;
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sa.sa_flags = SA_SIGINFO | SA_ONSTACK;
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if (sigaction(SIGBUS, &sa, NULL) == -1)
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err(1, "sigaction SIGBUS");
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if (sigaction(SIGSEGV, &sa, NULL) == -1)
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err(1, "sigaction SIGSEGV");
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if (sigaction(SIGILL, &sa, NULL) == -1)
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err(1, "sigaction SIGILL");
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vm86_code = mmap((void *)0x10000, PAGE_SIZE, PROT_READ | PROT_WRITE |
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PROT_EXEC, MAP_ANON | MAP_FIXED, -1, 0);
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if (vm86_code == MAP_FAILED)
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err(1, "mmap");
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memcpy(vm86_code, vm86_code_start, vm86_code_end - vm86_code_start);
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memset(&va, 0, sizeof(va));
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if (i386_vm86(VM86_INIT, &va) == -1)
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err(1, "VM86_INIT");
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memset(&uc, 0, sizeof(uc));
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uc.uc_mcontext.mc_ecx = 0x2345;
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uc.uc_mcontext.mc_eflags = PSL_VM | PSL_USER;
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uc.uc_mcontext.mc_cs = uc.uc_mcontext.mc_ds = uc.uc_mcontext.mc_es =
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uc.uc_mcontext.mc_ss = (uintptr_t)vm86_code >> 4;
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uc.uc_mcontext.mc_esp = 0xfffe;
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sigreturn(&uc);
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}
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