311 lines
8.7 KiB
C
311 lines
8.7 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
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* $Id$
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*
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*/
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#include "opt_user_ldt.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_prot.h>
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#include <sys/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_extern.h>
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#include <sys/user.h>
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#include <machine/cpu.h>
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#include <machine/sysarch.h>
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#include <vm/vm_kern.h> /* for kernel_map */
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#define MAX_LD 8192
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#define LD_PER_PAGE 512
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#define NEW_MAX_LD(num) ((num + LD_PER_PAGE) & ~(LD_PER_PAGE-1))
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#define SIZE_FROM_LARGEST_LD(num) (NEW_MAX_LD(num) << 3)
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void set_user_ldt __P((struct pcb *pcb));
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#ifdef USER_LDT
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static int i386_get_ldt __P((struct proc *, char *, int *));
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static int i386_set_ldt __P((struct proc *, char *, int *));
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#endif
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#ifndef _SYS_SYSPROTO_H_
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struct sysarch_args {
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int op;
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char *parms;
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};
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#endif
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int
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sysarch(p, uap, retval)
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struct proc *p;
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register struct sysarch_args *uap;
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int *retval;
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{
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int error = 0;
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switch(uap->op) {
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#ifdef USER_LDT
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case I386_GET_LDT:
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error = i386_get_ldt(p, uap->parms, retval);
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break;
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case I386_SET_LDT:
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error = i386_set_ldt(p, uap->parms, retval);
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break;
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#endif
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default:
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error = EINVAL;
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break;
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}
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return(error);
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}
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#ifdef USER_LDT
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/*
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* Update the GDT entry pointing to the LDT to point to the LDT of the
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* current process.
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*/
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void
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set_user_ldt(struct pcb *pcb)
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{
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gdt_segs[GUSERLDT_SEL].ssd_base = (unsigned)pcb->pcb_ldt;
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gdt_segs[GUSERLDT_SEL].ssd_limit = (pcb->pcb_ldt_len * sizeof(union descriptor)) - 1;
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ssdtosd(&gdt_segs[GUSERLDT_SEL], &gdt[GUSERLDT_SEL].sd);
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lldt(GSEL(GUSERLDT_SEL, SEL_KPL));
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currentldt = GSEL(GUSERLDT_SEL, SEL_KPL);
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}
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struct i386_get_ldt_args {
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int start;
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union descriptor *desc;
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int num;
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};
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static int
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i386_get_ldt(p, args, retval)
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struct proc *p;
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char *args;
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int *retval;
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{
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int error = 0;
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struct pcb *pcb = &p->p_addr->u_pcb;
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int nldt, num;
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union descriptor *lp;
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int s;
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struct i386_get_ldt_args ua;
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struct i386_get_ldt_args *uap = &ua;
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if ((error = copyin(args, uap, sizeof(struct i386_get_ldt_args))) < 0)
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return(error);
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#ifdef DEBUG
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printf("i386_get_ldt: start=%d num=%d descs=%x\n", uap->start,
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uap->num, uap->desc);
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#endif
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/* verify range of LDTs exist */
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if ((uap->start < 0) || (uap->num <= 0))
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return(EINVAL);
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s = splhigh();
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if (pcb->pcb_ldt) {
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nldt = pcb->pcb_ldt_len;
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num = min(uap->num, nldt);
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lp = &((union descriptor *)(pcb->pcb_ldt))[uap->start];
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} else {
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nldt = sizeof(ldt)/sizeof(ldt[0]);
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num = min(uap->num, nldt);
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lp = &ldt[uap->start];
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}
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if (uap->start > nldt) {
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splx(s);
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return(EINVAL);
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}
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error = copyout(lp, uap->desc, num * sizeof(union descriptor));
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if (!error)
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*retval = num;
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splx(s);
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return(error);
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}
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struct i386_set_ldt_args {
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int start;
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union descriptor *desc;
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int num;
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};
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static int
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i386_set_ldt(p, args, retval)
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struct proc *p;
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char *args;
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int *retval;
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{
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int error = 0, i, n;
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int largest_ld;
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struct pcb *pcb = &p->p_addr->u_pcb;
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int s;
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struct i386_set_ldt_args ua, *uap;
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if ((error = copyin(args, &ua, sizeof(struct i386_set_ldt_args))) < 0)
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return(error);
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uap = &ua;
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#ifdef DEBUG
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printf("i386_set_ldt: start=%d num=%d descs=%x\n", uap->start, uap->num, uap->desc);
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#endif
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/* verify range of descriptors to modify */
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if ((uap->start < 0) || (uap->start >= MAX_LD) || (uap->num < 0) ||
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(uap->num > MAX_LD))
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{
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return(EINVAL);
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}
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largest_ld = uap->start + uap->num - 1;
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if (largest_ld >= MAX_LD)
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return(EINVAL);
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/* allocate user ldt */
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if (!pcb->pcb_ldt || (largest_ld >= pcb->pcb_ldt_len)) {
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union descriptor *new_ldt = (union descriptor *)kmem_alloc(
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kernel_map, SIZE_FROM_LARGEST_LD(largest_ld));
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if (new_ldt == NULL) {
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return ENOMEM;
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}
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if (pcb->pcb_ldt) {
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bcopy(pcb->pcb_ldt, new_ldt, pcb->pcb_ldt_len
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* sizeof(union descriptor));
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kmem_free(kernel_map, (vm_offset_t)pcb->pcb_ldt,
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pcb->pcb_ldt_len * sizeof(union descriptor));
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} else {
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bcopy(ldt, new_ldt, sizeof(ldt));
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}
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pcb->pcb_ldt = (caddr_t)new_ldt;
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pcb->pcb_ldt_len = NEW_MAX_LD(largest_ld);
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if (pcb == curpcb)
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set_user_ldt(pcb);
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}
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/* Check descriptors for access violations */
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for (i = 0, n = uap->start; i < uap->num; i++, n++) {
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union descriptor desc, *dp;
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dp = &uap->desc[i];
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error = copyin(dp, &desc, sizeof(union descriptor));
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if (error)
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return(error);
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switch (desc.sd.sd_type) {
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case SDT_SYSNULL: /* system null */
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desc.sd.sd_p = 0;
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break;
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case SDT_SYS286TSS: /* system 286 TSS available */
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case SDT_SYSLDT: /* system local descriptor table */
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case SDT_SYS286BSY: /* system 286 TSS busy */
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case SDT_SYSTASKGT: /* system task gate */
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case SDT_SYS286IGT: /* system 286 interrupt gate */
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case SDT_SYS286TGT: /* system 286 trap gate */
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case SDT_SYSNULL2: /* undefined by Intel */
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case SDT_SYS386TSS: /* system 386 TSS available */
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case SDT_SYSNULL3: /* undefined by Intel */
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case SDT_SYS386BSY: /* system 386 TSS busy */
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case SDT_SYSNULL4: /* undefined by Intel */
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case SDT_SYS386IGT: /* system 386 interrupt gate */
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case SDT_SYS386TGT: /* system 386 trap gate */
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case SDT_SYS286CGT: /* system 286 call gate */
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case SDT_SYS386CGT: /* system 386 call gate */
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/* I can't think of any reason to allow a user proc
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* to create a segment of these types. They are
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* for OS use only.
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*/
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return EACCES;
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/* memory segment types */
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case SDT_MEMEC: /* memory execute only conforming */
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case SDT_MEMEAC: /* memory execute only accessed conforming */
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case SDT_MEMERC: /* memory execute read conforming */
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case SDT_MEMERAC: /* memory execute read accessed conforming */
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/* Must be "present" if executable and conforming. */
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if (desc.sd.sd_p == 0)
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return (EACCES);
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break;
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case SDT_MEMRO: /* memory read only */
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case SDT_MEMROA: /* memory read only accessed */
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case SDT_MEMRW: /* memory read write */
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case SDT_MEMRWA: /* memory read write accessed */
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case SDT_MEMROD: /* memory read only expand dwn limit */
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case SDT_MEMRODA: /* memory read only expand dwn lim accessed */
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case SDT_MEMRWD: /* memory read write expand dwn limit */
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case SDT_MEMRWDA: /* memory read write expand dwn lim acessed */
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case SDT_MEME: /* memory execute only */
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case SDT_MEMEA: /* memory execute only accessed */
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case SDT_MEMER: /* memory execute read */
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case SDT_MEMERA: /* memory execute read accessed */
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break;
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default:
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return(EINVAL);
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/*NOTREACHED*/
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}
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/* Only user (ring-3) descriptors may be present. */
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if ((desc.sd.sd_p != 0) && (desc.sd.sd_dpl != SEL_UPL))
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return (EACCES);
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}
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s = splhigh();
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/* Fill in range */
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error = copyin(uap->desc,
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&((union descriptor *)(pcb->pcb_ldt))[uap->start],
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uap->num * sizeof(union descriptor));
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if (!error)
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*retval = uap->start;
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splx(s);
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return(error);
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}
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#endif /* USER_LDT */
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