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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/xfs/@/amd64/amd64/sys_machdep.c |
/*-
* Copyright (c) 2003 Peter Wemm.
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/amd64/amd64/sys_machdep.c 231979 2012-02-21 20:56:03Z kib $");
#include "opt_capsicum.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/capability.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/sysproto.h>
#include <sys/uio.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <vm/vm_kern.h> /* for kernel_map */
#include <vm/vm_extern.h>
#include <machine/frame.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/specialreg.h>
#include <machine/sysarch.h>
#include <machine/tss.h>
#include <machine/vmparam.h>
#include <security/audit/audit.h>
#define MAX_LD 8192
int max_ldt_segment = 1024;
SYSCTL_INT(_machdep, OID_AUTO, max_ldt_segment, CTLFLAG_RDTUN,
&max_ldt_segment, 0,
"Maximum number of allowed LDT segments in the single address space");
static void
max_ldt_segment_init(void *arg __unused)
{
TUNABLE_INT_FETCH("machdep.max_ldt_segment", &max_ldt_segment);
if (max_ldt_segment <= 0)
max_ldt_segment = 1;
if (max_ldt_segment > MAX_LD)
max_ldt_segment = MAX_LD;
}
SYSINIT(maxldt, SI_SUB_VM_CONF, SI_ORDER_ANY, max_ldt_segment_init, NULL);
#ifdef notyet
#ifdef SMP
static void set_user_ldt_rv(struct vmspace *vmsp);
#endif
#endif
static void user_ldt_derefl(struct proc_ldt *pldt);
#ifndef _SYS_SYSPROTO_H_
struct sysarch_args {
int op;
char *parms;
};
#endif
int
sysarch_ldt(struct thread *td, struct sysarch_args *uap, int uap_space)
{
struct i386_ldt_args *largs, la;
struct user_segment_descriptor *lp;
int error = 0;
/*
* XXXKIB check that the BSM generation code knows to encode
* the op argument.
*/
AUDIT_ARG_CMD(uap->op);
if (uap_space == UIO_USERSPACE) {
error = copyin(uap->parms, &la, sizeof(struct i386_ldt_args));
if (error != 0)
return (error);
largs = &la;
} else
largs = (struct i386_ldt_args *)uap->parms;
switch (uap->op) {
case I386_GET_LDT:
error = amd64_get_ldt(td, largs);
break;
case I386_SET_LDT:
if (largs->descs != NULL && largs->num > max_ldt_segment)
return (EINVAL);
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
if (largs->descs != NULL) {
lp = malloc(largs->num * sizeof(struct
user_segment_descriptor), M_TEMP, M_WAITOK);
error = copyin(largs->descs, lp, largs->num *
sizeof(struct user_segment_descriptor));
if (error == 0)
error = amd64_set_ldt(td, largs, lp);
free(lp, M_TEMP);
} else {
error = amd64_set_ldt(td, largs, NULL);
}
break;
}
return (error);
}
void
update_gdt_gsbase(struct thread *td, uint32_t base)
{
struct user_segment_descriptor *sd;
if (td != curthread)
return;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
critical_enter();
sd = PCPU_GET(gs32p);
sd->sd_lobase = base & 0xffffff;
sd->sd_hibase = (base >> 24) & 0xff;
critical_exit();
}
void
update_gdt_fsbase(struct thread *td, uint32_t base)
{
struct user_segment_descriptor *sd;
if (td != curthread)
return;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
critical_enter();
sd = PCPU_GET(fs32p);
sd->sd_lobase = base & 0xffffff;
sd->sd_hibase = (base >> 24) & 0xff;
critical_exit();
}
int
sysarch(td, uap)
struct thread *td;
register struct sysarch_args *uap;
{
int error = 0;
struct pcb *pcb = curthread->td_pcb;
uint32_t i386base;
uint64_t a64base;
struct i386_ioperm_args iargs;
struct i386_get_xfpustate i386xfpu;
struct amd64_get_xfpustate a64xfpu;
#ifdef CAPABILITY_MODE
/*
* When adding new operations, add a new case statement here to
* explicitly indicate whether or not the operation is safe to
* perform in capability mode.
*/
if (IN_CAPABILITY_MODE(td)) {
switch (uap->op) {
case I386_GET_LDT:
case I386_SET_LDT:
case I386_GET_IOPERM:
case I386_GET_FSBASE:
case I386_SET_FSBASE:
case I386_GET_GSBASE:
case I386_SET_GSBASE:
case I386_GET_XFPUSTATE:
case AMD64_GET_FSBASE:
case AMD64_SET_FSBASE:
case AMD64_GET_GSBASE:
case AMD64_SET_GSBASE:
case AMD64_GET_XFPUSTATE:
break;
case I386_SET_IOPERM:
default:
return (ECAPMODE);
}
}
#endif
if (uap->op == I386_GET_LDT || uap->op == I386_SET_LDT)
return (sysarch_ldt(td, uap, UIO_USERSPACE));
/*
* XXXKIB check that the BSM generation code knows to encode
* the op argument.
*/
AUDIT_ARG_CMD(uap->op);
switch (uap->op) {
case I386_GET_IOPERM:
case I386_SET_IOPERM:
if ((error = copyin(uap->parms, &iargs,
sizeof(struct i386_ioperm_args))) != 0)
return (error);
break;
case I386_GET_XFPUSTATE:
if ((error = copyin(uap->parms, &i386xfpu,
sizeof(struct i386_get_xfpustate))) != 0)
return (error);
a64xfpu.addr = (void *)(uintptr_t)i386xfpu.addr;
a64xfpu.len = i386xfpu.len;
break;
case AMD64_GET_XFPUSTATE:
if ((error = copyin(uap->parms, &a64xfpu,
sizeof(struct amd64_get_xfpustate))) != 0)
return (error);
break;
default:
break;
}
switch (uap->op) {
case I386_GET_IOPERM:
error = amd64_get_ioperm(td, &iargs);
if (error == 0)
error = copyout(&iargs, uap->parms,
sizeof(struct i386_ioperm_args));
break;
case I386_SET_IOPERM:
error = amd64_set_ioperm(td, &iargs);
break;
case I386_GET_FSBASE:
i386base = pcb->pcb_fsbase;
error = copyout(&i386base, uap->parms, sizeof(i386base));
break;
case I386_SET_FSBASE:
error = copyin(uap->parms, &i386base, sizeof(i386base));
if (!error) {
pcb->pcb_fsbase = i386base;
td->td_frame->tf_fs = _ufssel;
update_gdt_fsbase(td, i386base);
}
break;
case I386_GET_GSBASE:
i386base = pcb->pcb_gsbase;
error = copyout(&i386base, uap->parms, sizeof(i386base));
break;
case I386_SET_GSBASE:
error = copyin(uap->parms, &i386base, sizeof(i386base));
if (!error) {
pcb->pcb_gsbase = i386base;
td->td_frame->tf_gs = _ugssel;
update_gdt_gsbase(td, i386base);
}
break;
case AMD64_GET_FSBASE:
error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
break;
case AMD64_SET_FSBASE:
error = copyin(uap->parms, &a64base, sizeof(a64base));
if (!error) {
if (a64base < VM_MAXUSER_ADDRESS) {
pcb->pcb_fsbase = a64base;
set_pcb_flags(pcb, PCB_FULL_IRET);
td->td_frame->tf_fs = _ufssel;
} else
error = EINVAL;
}
break;
case AMD64_GET_GSBASE:
error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
break;
case AMD64_SET_GSBASE:
error = copyin(uap->parms, &a64base, sizeof(a64base));
if (!error) {
if (a64base < VM_MAXUSER_ADDRESS) {
pcb->pcb_gsbase = a64base;
set_pcb_flags(pcb, PCB_FULL_IRET);
td->td_frame->tf_gs = _ugssel;
} else
error = EINVAL;
}
break;
case I386_GET_XFPUSTATE:
case AMD64_GET_XFPUSTATE:
if (a64xfpu.len > cpu_max_ext_state_size -
sizeof(struct savefpu))
return (EINVAL);
fpugetregs(td);
error = copyout((char *)(get_pcb_user_save_td(td) + 1),
a64xfpu.addr, a64xfpu.len);
return (error);
default:
error = EINVAL;
break;
}
return (error);
}
int
amd64_set_ioperm(td, uap)
struct thread *td;
struct i386_ioperm_args *uap;
{
int i, error;
char *iomap;
struct amd64tss *tssp;
struct system_segment_descriptor *tss_sd;
u_long *addr;
struct pcb *pcb;
if ((error = priv_check(td, PRIV_IO)) != 0)
return (error);
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
return (error);
if (uap->start + uap->length > IOPAGES * PAGE_SIZE * NBBY)
return (EINVAL);
/*
* XXX
* While this is restricted to root, we should probably figure out
* whether any other driver is using this i/o address, as so not to
* cause confusion. This probably requires a global 'usage registry'.
*/
pcb = td->td_pcb;
if (pcb->pcb_tssp == NULL) {
tssp = (struct amd64tss *)kmem_alloc(kernel_map,
ctob(IOPAGES+1));
if (tssp == NULL)
return (ENOMEM);
iomap = (char *)&tssp[1];
addr = (u_long *)iomap;
for (i = 0; i < (ctob(IOPAGES) + 1) / sizeof(u_long); i++)
*addr++ = ~0;
critical_enter();
/* Takes care of tss_rsp0. */
memcpy(tssp, &common_tss[PCPU_GET(cpuid)],
sizeof(struct amd64tss));
tssp->tss_iobase = sizeof(*tssp);
pcb->pcb_tssp = tssp;
tss_sd = PCPU_GET(tss);
tss_sd->sd_lobase = (u_long)tssp & 0xffffff;
tss_sd->sd_hibase = ((u_long)tssp >> 24) & 0xfffffffffful;
tss_sd->sd_type = SDT_SYSTSS;
ltr(GSEL(GPROC0_SEL, SEL_KPL));
PCPU_SET(tssp, tssp);
critical_exit();
} else
iomap = (char *)&pcb->pcb_tssp[1];
for (i = uap->start; i < uap->start + uap->length; i++) {
if (uap->enable)
iomap[i >> 3] &= ~(1 << (i & 7));
else
iomap[i >> 3] |= (1 << (i & 7));
}
return (error);
}
int
amd64_get_ioperm(td, uap)
struct thread *td;
struct i386_ioperm_args *uap;
{
int i, state;
char *iomap;
if (uap->start >= IOPAGES * PAGE_SIZE * NBBY)
return (EINVAL);
if (td->td_pcb->pcb_tssp == NULL) {
uap->length = 0;
goto done;
}
iomap = (char *)&td->td_pcb->pcb_tssp[1];
i = uap->start;
state = (iomap[i >> 3] >> (i & 7)) & 1;
uap->enable = !state;
uap->length = 1;
for (i = uap->start + 1; i < IOPAGES * PAGE_SIZE * NBBY; i++) {
if (state != ((iomap[i >> 3] >> (i & 7)) & 1))
break;
uap->length++;
}
done:
return (0);
}
/*
* Update the GDT entry pointing to the LDT to point to the LDT of the
* current process.
*/
void
set_user_ldt(struct mdproc *mdp)
{
critical_enter();
*PCPU_GET(ldt) = mdp->md_ldt_sd;
lldt(GSEL(GUSERLDT_SEL, SEL_KPL));
critical_exit();
}
#ifdef notyet
#ifdef SMP
static void
set_user_ldt_rv(struct vmspace *vmsp)
{
struct thread *td;
td = curthread;
if (vmsp != td->td_proc->p_vmspace)
return;
set_user_ldt(&td->td_proc->p_md);
}
#endif
#endif
struct proc_ldt *
user_ldt_alloc(struct proc *p, int force)
{
struct proc_ldt *pldt, *new_ldt;
struct mdproc *mdp;
struct soft_segment_descriptor sldt;
mtx_assert(&dt_lock, MA_OWNED);
mdp = &p->p_md;
if (!force && mdp->md_ldt != NULL)
return (mdp->md_ldt);
mtx_unlock(&dt_lock);
new_ldt = malloc(sizeof(struct proc_ldt), M_SUBPROC, M_WAITOK);
new_ldt->ldt_base = (caddr_t)kmem_alloc(kernel_map,
max_ldt_segment * sizeof(struct user_segment_descriptor));
if (new_ldt->ldt_base == NULL) {
FREE(new_ldt, M_SUBPROC);
mtx_lock(&dt_lock);
return (NULL);
}
new_ldt->ldt_refcnt = 1;
sldt.ssd_base = (uint64_t)new_ldt->ldt_base;
sldt.ssd_limit = max_ldt_segment *
sizeof(struct user_segment_descriptor) - 1;
sldt.ssd_type = SDT_SYSLDT;
sldt.ssd_dpl = SEL_KPL;
sldt.ssd_p = 1;
sldt.ssd_long = 0;
sldt.ssd_def32 = 0;
sldt.ssd_gran = 0;
mtx_lock(&dt_lock);
pldt = mdp->md_ldt;
if (pldt != NULL && !force) {
kmem_free(kernel_map, (vm_offset_t)new_ldt->ldt_base,
max_ldt_segment * sizeof(struct user_segment_descriptor));
free(new_ldt, M_SUBPROC);
return (pldt);
}
if (pldt != NULL) {
bcopy(pldt->ldt_base, new_ldt->ldt_base, max_ldt_segment *
sizeof(struct user_segment_descriptor));
user_ldt_derefl(pldt);
}
ssdtosyssd(&sldt, &p->p_md.md_ldt_sd);
atomic_store_rel_ptr((volatile uintptr_t *)&mdp->md_ldt,
(uintptr_t)new_ldt);
if (p == curproc)
set_user_ldt(mdp);
return (mdp->md_ldt);
}
void
user_ldt_free(struct thread *td)
{
struct proc *p = td->td_proc;
struct mdproc *mdp = &p->p_md;
struct proc_ldt *pldt;
mtx_assert(&dt_lock, MA_OWNED);
if ((pldt = mdp->md_ldt) == NULL) {
mtx_unlock(&dt_lock);
return;
}
mdp->md_ldt = NULL;
bzero(&mdp->md_ldt_sd, sizeof(mdp->md_ldt_sd));
if (td == curthread)
lldt(GSEL(GNULL_SEL, SEL_KPL));
user_ldt_deref(pldt);
}
static void
user_ldt_derefl(struct proc_ldt *pldt)
{
if (--pldt->ldt_refcnt == 0) {
kmem_free(kernel_map, (vm_offset_t)pldt->ldt_base,
max_ldt_segment * sizeof(struct user_segment_descriptor));
free(pldt, M_SUBPROC);
}
}
void
user_ldt_deref(struct proc_ldt *pldt)
{
mtx_assert(&dt_lock, MA_OWNED);
user_ldt_derefl(pldt);
mtx_unlock(&dt_lock);
}
/*
* Note for the authors of compat layers (linux, etc): copyout() in
* the function below is not a problem since it presents data in
* arch-specific format (i.e. i386-specific in this case), not in
* the OS-specific one.
*/
int
amd64_get_ldt(td, uap)
struct thread *td;
struct i386_ldt_args *uap;
{
int error = 0;
struct proc_ldt *pldt;
int num;
struct user_segment_descriptor *lp;
#ifdef DEBUG
printf("amd64_get_ldt: start=%d num=%d descs=%p\n",
uap->start, uap->num, (void *)uap->descs);
#endif
if ((pldt = td->td_proc->p_md.md_ldt) != NULL) {
lp = &((struct user_segment_descriptor *)(pldt->ldt_base))
[uap->start];
num = min(uap->num, max_ldt_segment);
} else
return (EINVAL);
if ((uap->start > (unsigned int)max_ldt_segment) ||
((unsigned int)num > (unsigned int)max_ldt_segment) ||
((unsigned int)(uap->start + num) > (unsigned int)max_ldt_segment))
return(EINVAL);
error = copyout(lp, uap->descs, num *
sizeof(struct user_segment_descriptor));
if (!error)
td->td_retval[0] = num;
return(error);
}
int
amd64_set_ldt(td, uap, descs)
struct thread *td;
struct i386_ldt_args *uap;
struct user_segment_descriptor *descs;
{
int error = 0, i;
int largest_ld;
struct mdproc *mdp = &td->td_proc->p_md;
struct proc_ldt *pldt;
struct user_segment_descriptor *dp;
struct proc *p;
#ifdef DEBUG
printf("amd64_set_ldt: start=%d num=%d descs=%p\n",
uap->start, uap->num, (void *)uap->descs);
#endif
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
p = td->td_proc;
if (descs == NULL) {
/* Free descriptors */
if (uap->start == 0 && uap->num == 0)
uap->num = max_ldt_segment;
if (uap->num == 0)
return (EINVAL);
if ((pldt = mdp->md_ldt) == NULL ||
uap->start >= max_ldt_segment)
return (0);
largest_ld = uap->start + uap->num;
if (largest_ld > max_ldt_segment)
largest_ld = max_ldt_segment;
i = largest_ld - uap->start;
mtx_lock(&dt_lock);
bzero(&((struct user_segment_descriptor *)(pldt->ldt_base))
[uap->start], sizeof(struct user_segment_descriptor) * i);
mtx_unlock(&dt_lock);
return (0);
}
if (!(uap->start == LDT_AUTO_ALLOC && uap->num == 1)) {
/* verify range of descriptors to modify */
largest_ld = uap->start + uap->num;
if (uap->start >= max_ldt_segment ||
largest_ld > max_ldt_segment)
return (EINVAL);
}
/* Check descriptors for access violations */
for (i = 0; i < uap->num; i++) {
dp = &descs[i];
switch (dp->sd_type) {
case SDT_SYSNULL: /* system null */
dp->sd_p = 0;
break;
case SDT_SYS286TSS:
case SDT_SYSLDT:
case SDT_SYS286BSY:
case SDT_SYS286CGT:
case SDT_SYSTASKGT:
case SDT_SYS286IGT:
case SDT_SYS286TGT:
case SDT_SYSNULL2:
case SDT_SYSTSS:
case SDT_SYSNULL3:
case SDT_SYSBSY:
case SDT_SYSCGT:
case SDT_SYSNULL4:
case SDT_SYSIGT:
case SDT_SYSTGT:
/* I can't think of any reason to allow a user proc
* to create a segment of these types. They are
* for OS use only.
*/
return (EACCES);
/*NOTREACHED*/
/* memory segment types */
case SDT_MEMEC: /* memory execute only conforming */
case SDT_MEMEAC: /* memory execute only accessed conforming */
case SDT_MEMERC: /* memory execute read conforming */
case SDT_MEMERAC: /* memory execute read accessed conforming */
/* Must be "present" if executable and conforming. */
if (dp->sd_p == 0)
return (EACCES);
break;
case SDT_MEMRO: /* memory read only */
case SDT_MEMROA: /* memory read only accessed */
case SDT_MEMRW: /* memory read write */
case SDT_MEMRWA: /* memory read write accessed */
case SDT_MEMROD: /* memory read only expand dwn limit */
case SDT_MEMRODA: /* memory read only expand dwn lim accessed */
case SDT_MEMRWD: /* memory read write expand dwn limit */
case SDT_MEMRWDA: /* memory read write expand dwn lim acessed */
case SDT_MEME: /* memory execute only */
case SDT_MEMEA: /* memory execute only accessed */
case SDT_MEMER: /* memory execute read */
case SDT_MEMERA: /* memory execute read accessed */
break;
default:
return(EINVAL);
/*NOTREACHED*/
}
/* Only user (ring-3) descriptors may be present. */
if ((dp->sd_p != 0) && (dp->sd_dpl != SEL_UPL))
return (EACCES);
}
if (uap->start == LDT_AUTO_ALLOC && uap->num == 1) {
/* Allocate a free slot */
mtx_lock(&dt_lock);
pldt = user_ldt_alloc(p, 0);
if (pldt == NULL) {
mtx_unlock(&dt_lock);
return (ENOMEM);
}
/*
* start scanning a bit up to leave room for NVidia and
* Wine, which still user the "Blat" method of allocation.
*/
i = 16;
dp = &((struct user_segment_descriptor *)(pldt->ldt_base))[i];
for (; i < max_ldt_segment; ++i, ++dp) {
if (dp->sd_type == SDT_SYSNULL)
break;
}
if (i >= max_ldt_segment) {
mtx_unlock(&dt_lock);
return (ENOSPC);
}
uap->start = i;
error = amd64_set_ldt_data(td, i, 1, descs);
mtx_unlock(&dt_lock);
} else {
largest_ld = uap->start + uap->num;
if (largest_ld > max_ldt_segment)
return (EINVAL);
mtx_lock(&dt_lock);
if (user_ldt_alloc(p, 0) != NULL) {
error = amd64_set_ldt_data(td, uap->start, uap->num,
descs);
}
mtx_unlock(&dt_lock);
}
if (error == 0)
td->td_retval[0] = uap->start;
return (error);
}
int
amd64_set_ldt_data(struct thread *td, int start, int num,
struct user_segment_descriptor *descs)
{
struct mdproc *mdp = &td->td_proc->p_md;
struct proc_ldt *pldt = mdp->md_ldt;
mtx_assert(&dt_lock, MA_OWNED);
/* Fill in range */
bcopy(descs,
&((struct user_segment_descriptor *)(pldt->ldt_base))[start],
num * sizeof(struct user_segment_descriptor));
return (0);
}