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/*-
* 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: release/9.1.0/sys/powerpc/aim/copyinout.c 223485 2011-06-23 22:21:28Z nwhitehorn $");
#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