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108 lines
3.3 KiB
C
108 lines
3.3 KiB
C
/* $NetBSD: syscallemu_x86.c,v 1.1 2012/01/06 13:16:20 jmcneill Exp $ */
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/*-
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* Copyright (c) 2011 Reinoud Zandijk <reinoud@NetBSD.org>
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* Copyright (c) 2012 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: syscallemu_x86.c,v 1.1 2012/01/06 13:16:20 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <machine/userret.h>
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#include "syscallemu.h"
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/*
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* If syscallemu specific data is present for the process, verify that the
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* caller is allowed to execute system calls. If not, deliver a SIGILL to
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* the process. When syscallemu specific data is not present, simply defer
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* to the original syscall handler.
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*/
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static void
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x86_syscall_emu(struct trapframe *frame)
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{
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void (*md_syscall)(struct trapframe *) = NULL;
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struct syscallemu_data *sce;
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register_t rip_call;
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struct proc *p;
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ksiginfo_t ksi;
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lwp_t *l;
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l = curlwp;
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p = l->l_proc;
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rip_call = X86_TF_RIP(frame) - frame->tf_err;
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/* Determine if we need to emulate the system call */
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sce = syscallemu_getsce(p);
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if (sce) {
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if ((rip_call >= sce->sce_user_start &&
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rip_call < sce->sce_user_end) ||
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(rip_call + frame->tf_err >= sce->sce_user_start &&
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rip_call + frame->tf_err < sce->sce_user_end)) {
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md_syscall = NULL;
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} else {
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md_syscall = sce->sce_md_syscall;
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}
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} else {
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md_syscall = p->p_md.md_syscall;
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}
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if (md_syscall == NULL) {
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/* If emulating, deliver SIGILL to process */
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X86_TF_RIP(frame) = rip_call;
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KSI_INIT_TRAP(&ksi);
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ksi.ksi_signo = SIGILL;
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ksi.ksi_code = ILL_ILLTRP;
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ksi.ksi_addr = (void *)X86_TF_RIP(frame);
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ksi.ksi_trap = 0;
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trapsignal(l, &ksi);
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userret(l);
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} else {
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/* Not emulating, so treat as a normal syscall */
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KASSERT(md_syscall != NULL);
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md_syscall(frame);
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}
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}
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/*
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* Set p_md.md_syscall to our syscall filter, and return a pointer to the
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* original syscall handler.
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*/
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void *
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md_syscallemu(struct proc *p)
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{
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void *osyscall;
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osyscall = p->p_md.md_syscall;
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p->p_md.md_syscall = x86_syscall_emu;
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return osyscall;
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}
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