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19317dfd85
of its argument before atomically replacing it, which could occasionally return the wrong value on an SMP system. This resulted in user mutex operations hanging when using threaded applications.
316 lines
6.8 KiB
C
316 lines
6.8 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/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/vmparam.h>
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int setfault(faultbuf); /* defined in locore.S */
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static int
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is_uaddr(const void *addr)
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{
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int rv = ((vm_offset_t)addr <= VM_MAXUSER_ADDRESS) ? 1 : 0;
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return rv;
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}
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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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faultbuf env;
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if (!is_uaddr(udaddr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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bcopy(kaddr, udaddr, len);
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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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faultbuf env;
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if (!is_uaddr(udaddr) || is_uaddr(kaddr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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bcopy(udaddr, kaddr, len);
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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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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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if (!is_uaddr(udaddr) || is_uaddr(kaddr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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c = *up++;
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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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faultbuf env;
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if (!is_uaddr(addr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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*(char *)addr = (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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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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faultbuf env;
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if (!is_uaddr(addr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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*(long *)addr = 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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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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int
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fubyte(const void *addr)
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{
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struct thread *td;
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faultbuf env;
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int val;
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if (!is_uaddr(addr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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val = *(const u_char *)addr;
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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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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faultbuf env;
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long val;
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if (!is_uaddr(addr))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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val = *(const long *)addr;
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td->td_pcb->pcb_onfault = NULL;
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return (val);
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}
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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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uint32_t
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casuword32(volatile uint32_t *base, uint32_t oldval, uint32_t newval)
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{
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return (casuword((volatile u_long *)base, oldval, newval));
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}
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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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faultbuf env;
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u_long val;
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if (!((vm_offset_t)addr <= VM_MAXUSER_ADDRESS))
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return (EFAULT);
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td = PCPU_GET(curthread);
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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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__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" (*addr)
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: "r" (addr), "r" (old), "r" (new), "m" (*addr)
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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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