ad6b3047a4
switching the user segment register. All races should now be closed and a minimum of pipelines flushes be required to close them.
514 lines
11 KiB
C
514 lines
11 KiB
C
/*-
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* Copyright (C) 2002 Benno Rice
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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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (C) 1993 Wolfgang Solfrank.
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* Copyright (C) 1993 TooLs GmbH.
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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 TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <machine/pcb.h>
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#include <machine/sr.h>
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#include <machine/slb.h>
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int setfault(faultbuf); /* defined in locore.S */
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/*
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* Makes sure that the right segment of userspace is mapped in.
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*/
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#ifdef __powerpc64__
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static __inline void
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set_user_sr(pmap_t pm, const void *addr)
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{
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struct slb *slb;
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register_t slbv;
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/* Try lockless look-up first */
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slb = user_va_to_slb_entry(pm, (vm_offset_t)addr);
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if (slb == NULL) {
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/* If it isn't there, we need to pre-fault the VSID */
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PMAP_LOCK(pm);
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slbv = va_to_vsid(pm, (vm_offset_t)addr) << SLBV_VSID_SHIFT;
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PMAP_UNLOCK(pm);
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} else {
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slbv = slb->slbv;
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}
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/* If we have already set this VSID, we can just return */
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if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == slbv)
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return;
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__asm __volatile ("isync; slbie %0; slbmte %1, %2; isync" ::
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"r"(USER_ADDR), "r"(slbv), "r"(USER_SLB_SLBE));
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curthread->td_pcb->pcb_cpu.aim.usr_segm =
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(uintptr_t)addr >> ADDR_SR_SHFT;
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curthread->td_pcb->pcb_cpu.aim.usr_vsid = slbv;
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}
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#else
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static __inline void
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set_user_sr(pmap_t pm, const void *addr)
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{
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register_t vsid;
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vsid = va_to_vsid(pm, (vm_offset_t)addr);
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/* If we have already set this VSID, we can just return */
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if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == vsid)
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return;
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__asm __volatile("isync");
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curthread->td_pcb->pcb_cpu.aim.usr_vsid = vsid;
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__asm __volatile("mtsr %0,%1; isync" :: "n"(USER_SR), "r"(vsid));
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}
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#endif
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int
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copyout(const void *kaddr, void *udaddr, size_t len)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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const char *kp;
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char *up, *p;
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size_t l;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (EFAULT);
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}
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kp = kaddr;
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up = udaddr;
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while (len > 0) {
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p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
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l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
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if (l > len)
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l = len;
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set_user_sr(pm,up);
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bcopy(kp, p, l);
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up += l;
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kp += l;
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len -= l;
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}
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td->td_pcb->pcb_onfault = NULL;
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return (0);
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}
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int
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copyin(const void *udaddr, void *kaddr, size_t len)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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const char *up;
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char *kp, *p;
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size_t l;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (EFAULT);
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}
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kp = kaddr;
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up = udaddr;
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while (len > 0) {
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p = (char *)USER_ADDR + ((uintptr_t)up & ~SEGMENT_MASK);
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l = ((char *)USER_ADDR + SEGMENT_LENGTH) - p;
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if (l > len)
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l = len;
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set_user_sr(pm,up);
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bcopy(p, kp, l);
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up += l;
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kp += l;
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len -= l;
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}
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td->td_pcb->pcb_onfault = NULL;
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return (0);
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}
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int
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copyinstr(const void *udaddr, void *kaddr, size_t len, size_t *done)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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const char *up;
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char *kp;
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size_t l;
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int rv, c;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (EFAULT);
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}
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kp = kaddr;
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up = udaddr;
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rv = ENAMETOOLONG;
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for (l = 0; len-- > 0; l++) {
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if ((c = fubyte(up++)) < 0) {
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rv = EFAULT;
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break;
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}
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if (!(*kp++ = c)) {
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l++;
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rv = 0;
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break;
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}
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}
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if (done != NULL) {
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*done = l;
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}
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td->td_pcb->pcb_onfault = NULL;
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return (rv);
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}
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int
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subyte(void *addr, int byte)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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char *p;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (char *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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*p = (char)byte;
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td->td_pcb->pcb_onfault = NULL;
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return (0);
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}
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#ifdef __powerpc64__
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int
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suword32(void *addr, int word)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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int *p;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (int *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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*p = word;
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td->td_pcb->pcb_onfault = NULL;
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return (0);
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}
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#endif
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int
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suword(void *addr, long word)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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long *p;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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*p = word;
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td->td_pcb->pcb_onfault = NULL;
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return (0);
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}
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#ifdef __powerpc64__
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int
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suword64(void *addr, int64_t word)
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{
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return (suword(addr, (long)word));
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}
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#else
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int
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suword32(void *addr, int32_t word)
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{
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return (suword(addr, (long)word));
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}
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#endif
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int
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fubyte(const void *addr)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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u_char *p;
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int val;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (u_char *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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val = *p;
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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#ifdef __powerpc64__
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int32_t
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fuword32(const void *addr)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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int32_t *p, val;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (int32_t *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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val = *p;
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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#endif
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long
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fuword(const void *addr)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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long *p, val;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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set_user_sr(pm,addr);
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val = *p;
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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#ifndef __powerpc64__
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int32_t
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fuword32(const void *addr)
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{
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return ((int32_t)fuword(addr));
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}
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#endif
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uint32_t
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casuword32(volatile uint32_t *addr, uint32_t old, uint32_t new)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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uint32_t *p, val;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (uint32_t *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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set_user_sr(pm,(const void *)(vm_offset_t)addr);
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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__asm __volatile (
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"1:\tlwarx %0, 0, %2\n\t" /* load old value */
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"cmplw %3, %0\n\t" /* compare */
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"bne 2f\n\t" /* exit if not equal */
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"stwcx. %4, 0, %2\n\t" /* attempt to store */
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"bne- 1b\n\t" /* spin if failed */
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"b 3f\n\t" /* we've succeeded */
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"2:\n\t"
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"stwcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
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"3:\n\t"
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: "=&r" (val), "=m" (*p)
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: "r" (p), "r" (old), "r" (new), "m" (*p)
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: "cc", "memory");
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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#ifndef __powerpc64__
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u_long
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casuword(volatile u_long *addr, u_long old, u_long new)
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{
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return (casuword32((volatile uint32_t *)addr, old, new));
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}
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#else
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u_long
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casuword(volatile u_long *addr, u_long old, u_long new)
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{
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struct thread *td;
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pmap_t pm;
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faultbuf env;
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u_long *p, val;
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td = PCPU_GET(curthread);
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pm = &td->td_proc->p_vmspace->vm_pmap;
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p = (u_long *)(USER_ADDR + ((uintptr_t)addr & ~SEGMENT_MASK));
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set_user_sr(pm,(const void *)(vm_offset_t)addr);
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if (setfault(env)) {
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td->td_pcb->pcb_onfault = NULL;
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return (-1);
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}
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__asm __volatile (
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"1:\tldarx %0, 0, %2\n\t" /* load old value */
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"cmpld %3, %0\n\t" /* compare */
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"bne 2f\n\t" /* exit if not equal */
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"stdcx. %4, 0, %2\n\t" /* attempt to store */
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"bne- 1b\n\t" /* spin if failed */
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"b 3f\n\t" /* we've succeeded */
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"2:\n\t"
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"stdcx. %0, 0, %2\n\t" /* clear reservation (74xx) */
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"3:\n\t"
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: "=&r" (val), "=m" (*p)
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: "r" (p), "r" (old), "r" (new), "m" (*p)
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: "cc", "memory");
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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#endif
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