1d215b1285
instead of a PCPU field for curthread. This averts a race on SMP systems with a high interrupt rate where the thread looking up the value of curthread could be preempted and migrated between obtaining the PCPU pointer and reading the value of pc_curthread, resulting in curthread being observed to be the current thread on the thread's original CPU. This played merry havoc with the system, in particular with mutexes. Many thanks to jhb for helping me work this one out. Note that Book-E is in principle susceptible to the same problem, but has not been modified yet due to lack of Book-E hardware. MFC after: 2 weeks
523 lines
11 KiB
C
523 lines
11 KiB
C
/*-
|
|
* Copyright (C) 2002 Benno Rice
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY Benno Rice ``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 TOOLS GMBH 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.
|
|
*/
|
|
/*-
|
|
* Copyright (C) 1993 Wolfgang Solfrank.
|
|
* Copyright (C) 1993 TooLs GmbH.
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by TooLs GmbH.
|
|
* 4. The name of TooLs GmbH may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
|
|
#include <machine/pcb.h>
|
|
#include <machine/sr.h>
|
|
#include <machine/slb.h>
|
|
|
|
int setfault(faultbuf); /* defined in locore.S */
|
|
|
|
/*
|
|
* Makes sure that the right segment of userspace is mapped in.
|
|
*/
|
|
|
|
#ifdef __powerpc64__
|
|
static __inline void
|
|
set_user_sr(pmap_t pm, const void *addr)
|
|
{
|
|
struct slb *slb;
|
|
register_t slbv;
|
|
|
|
/* Try lockless look-up first */
|
|
slb = user_va_to_slb_entry(pm, (vm_offset_t)addr);
|
|
|
|
if (slb == NULL) {
|
|
/* If it isn't there, we need to pre-fault the VSID */
|
|
PMAP_LOCK(pm);
|
|
slbv = va_to_vsid(pm, (vm_offset_t)addr) << SLBV_VSID_SHIFT;
|
|
PMAP_UNLOCK(pm);
|
|
} else {
|
|
slbv = slb->slbv;
|
|
}
|
|
|
|
/* Mark segment no-execute */
|
|
slbv |= SLBV_N;
|
|
|
|
/* If we have already set this VSID, we can just return */
|
|
if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == slbv)
|
|
return;
|
|
|
|
__asm __volatile("isync");
|
|
curthread->td_pcb->pcb_cpu.aim.usr_segm =
|
|
(uintptr_t)addr >> ADDR_SR_SHFT;
|
|
curthread->td_pcb->pcb_cpu.aim.usr_vsid = slbv;
|
|
__asm __volatile ("slbie %0; slbmte %1, %2; isync" ::
|
|
"r"(USER_ADDR), "r"(slbv), "r"(USER_SLB_SLBE));
|
|
}
|
|
#else
|
|
static __inline void
|
|
set_user_sr(pmap_t pm, const void *addr)
|
|
{
|
|
register_t vsid;
|
|
|
|
vsid = va_to_vsid(pm, (vm_offset_t)addr);
|
|
|
|
/* Mark segment no-execute */
|
|
vsid |= SR_N;
|
|
|
|
/* If we have already set this VSID, we can just return */
|
|
if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == vsid)
|
|
return;
|
|
|
|
__asm __volatile("isync");
|
|
curthread->td_pcb->pcb_cpu.aim.usr_segm =
|
|
(uintptr_t)addr >> ADDR_SR_SHFT;
|
|
curthread->td_pcb->pcb_cpu.aim.usr_vsid = vsid;
|
|
__asm __volatile("mtsr %0,%1; isync" :: "n"(USER_SR), "r"(vsid));
|
|
}
|
|
#endif
|
|
|
|
int
|
|
copyout(const void *kaddr, void *udaddr, size_t len)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
const char *kp;
|
|
char *up, *p;
|
|
size_t l;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (EFAULT);
|
|
}
|
|
|
|
kp = kaddr;
|
|
up = udaddr;
|
|
|
|
while (len > 0) {
|
|
p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
|
|
|
|
l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
|
|
if (l > len)
|
|
l = len;
|
|
|
|
set_user_sr(pm,up);
|
|
|
|
bcopy(kp, p, l);
|
|
|
|
up += l;
|
|
kp += l;
|
|
len -= l;
|
|
}
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
copyin(const void *udaddr, void *kaddr, size_t len)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
const char *up;
|
|
char *kp, *p;
|
|
size_t l;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (EFAULT);
|
|
}
|
|
|
|
kp = kaddr;
|
|
up = udaddr;
|
|
|
|
while (len > 0) {
|
|
p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
|
|
|
|
l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
|
|
if (l > len)
|
|
l = len;
|
|
|
|
set_user_sr(pm,up);
|
|
|
|
bcopy(p, kp, l);
|
|
|
|
up += l;
|
|
kp += l;
|
|
len -= l;
|
|
}
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
const char *up;
|
|
char *kp;
|
|
size_t l;
|
|
int rv, c;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (EFAULT);
|
|
}
|
|
|
|
kp = kaddr;
|
|
up = udaddr;
|
|
|
|
rv = ENAMETOOLONG;
|
|
|
|
for (l = 0; len-- > 0; l++) {
|
|
if ((c = fubyte(up++)) < 0) {
|
|
rv = EFAULT;
|
|
break;
|
|
}
|
|
|
|
if (!(*kp++ = c)) {
|
|
l++;
|
|
rv = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (done != NULL) {
|
|
*done = l;
|
|
}
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (rv);
|
|
}
|
|
|
|
int
|
|
subyte(void *addr, int byte)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
char *p;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (char *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
*p = (char)byte;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef __powerpc64__
|
|
int
|
|
suword32(void *addr, int word)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
int *p;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (int *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
*p = word;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
int
|
|
suword(void *addr, long word)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
long *p;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
*p = word;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef __powerpc64__
|
|
int
|
|
suword64(void *addr, int64_t word)
|
|
{
|
|
return (suword(addr, (long)word));
|
|
}
|
|
#else
|
|
int
|
|
suword32(void *addr, int32_t word)
|
|
{
|
|
return (suword(addr, (long)word));
|
|
}
|
|
#endif
|
|
|
|
int
|
|
fubyte(const void *addr)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
u_char *p;
|
|
int val;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (u_char *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
val = *p;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (val);
|
|
}
|
|
|
|
#ifdef __powerpc64__
|
|
int32_t
|
|
fuword32(const void *addr)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
int32_t *p, val;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (int32_t *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
val = *p;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (val);
|
|
}
|
|
#endif
|
|
|
|
long
|
|
fuword(const void *addr)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
long *p, val;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
set_user_sr(pm,addr);
|
|
|
|
val = *p;
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (val);
|
|
}
|
|
|
|
#ifndef __powerpc64__
|
|
int32_t
|
|
fuword32(const void *addr)
|
|
{
|
|
return ((int32_t)fuword(addr));
|
|
}
|
|
#endif
|
|
|
|
uint32_t
|
|
casuword32(volatile uint32_t *addr, uint32_t old, uint32_t new)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
uint32_t *p, val;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (uint32_t *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
set_user_sr(pm,(const void *)(vm_offset_t)addr);
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
__asm __volatile (
|
|
"1:\tlwarx %0, 0, %2\n\t" /* load old value */
|
|
"cmplw %3, %0\n\t" /* compare */
|
|
"bne 2f\n\t" /* exit if not equal */
|
|
"stwcx. %4, 0, %2\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
"3:\n\t"
|
|
: "=&r" (val), "=m" (*p)
|
|
: "r" (p), "r" (old), "r" (new), "m" (*p)
|
|
: "cc", "memory");
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
|
|
return (val);
|
|
}
|
|
|
|
#ifndef __powerpc64__
|
|
u_long
|
|
casuword(volatile u_long *addr, u_long old, u_long new)
|
|
{
|
|
return (casuword32((volatile uint32_t *)addr, old, new));
|
|
}
|
|
#else
|
|
u_long
|
|
casuword(volatile u_long *addr, u_long old, u_long new)
|
|
{
|
|
struct thread *td;
|
|
pmap_t pm;
|
|
faultbuf env;
|
|
u_long *p, val;
|
|
|
|
td = curthread;
|
|
pm = &td->td_proc->p_vmspace->vm_pmap;
|
|
p = (u_long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
|
|
|
|
set_user_sr(pm,(const void *)(vm_offset_t)addr);
|
|
|
|
if (setfault(env)) {
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
return (-1);
|
|
}
|
|
|
|
__asm __volatile (
|
|
"1:\tldarx %0, 0, %2\n\t" /* load old value */
|
|
"cmpld %3, %0\n\t" /* compare */
|
|
"bne 2f\n\t" /* exit if not equal */
|
|
"stdcx. %4, 0, %2\n\t" /* attempt to store */
|
|
"bne- 1b\n\t" /* spin if failed */
|
|
"b 3f\n\t" /* we've succeeded */
|
|
"2:\n\t"
|
|
"stdcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
|
|
"3:\n\t"
|
|
: "=&r" (val), "=m" (*p)
|
|
: "r" (p), "r" (old), "r" (new), "m" (*p)
|
|
: "cc", "memory");
|
|
|
|
td->td_pcb->pcb_onfault = NULL;
|
|
|
|
return (val);
|
|
}
|
|
#endif
|
|
|