91aae953cb
If copyin family of routines fault, kernel does clear PSL.AC on the fault entry, but the AC flag of the faulted frame is kept intact. Since onfault handler is effectively jump, AC survives until syscall exit. Reported by: m00nbsd, via Sony Reviewed by: markj Sponsored by: The FreeBSD Foundation admbugs: 975
231 lines
4.8 KiB
ArmAsm
231 lines
4.8 KiB
ArmAsm
/*-
|
|
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
|
|
*
|
|
* Copyright (c) 2007 Konstantin Belousov
|
|
* 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 THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "linux32_assym.h" /* system definitions */
|
|
#include <machine/asmacros.h> /* miscellaneous asm macros */
|
|
|
|
#include "assym.inc"
|
|
|
|
futex_fault:
|
|
testl $CPUID_STDEXT_SMAP,cpu_stdext_feature(%rip)
|
|
je 1f
|
|
clac
|
|
1: movq $0,PCB_ONFAULT(%r8)
|
|
movl $-EFAULT,%eax
|
|
ret
|
|
|
|
ENTRY(futex_xchgl_nosmap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
xchgl %edi,(%rsi)
|
|
movl %edi,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_xchgl_nosmap)
|
|
|
|
ENTRY(futex_xchgl_smap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
stac
|
|
xchgl %edi,(%rsi)
|
|
clac
|
|
movl %edi,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_xchgl_smap)
|
|
|
|
ENTRY(futex_addl_nosmap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
xaddl %edi,(%rsi)
|
|
movl %edi,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_addl_nosmap)
|
|
|
|
ENTRY(futex_addl_smap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
stac
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
xaddl %edi,(%rsi)
|
|
clac
|
|
movl %edi,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_addl_smap)
|
|
|
|
ENTRY(futex_orl_nosmap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
orl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_orl_nosmap)
|
|
|
|
ENTRY(futex_orl_smap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
stac
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
orl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
clac
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_orl_smap)
|
|
|
|
ENTRY(futex_andl_nosmap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
andl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_andl_nosmap)
|
|
|
|
ENTRY(futex_andl_smap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
stac
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
andl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
clac
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_andl_smap)
|
|
|
|
ENTRY(futex_xorl_nosmap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
xorl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_xorl_nosmap)
|
|
|
|
ENTRY(futex_xorl_smap)
|
|
movq PCPU(CURPCB),%r8
|
|
movq $futex_fault,PCB_ONFAULT(%r8)
|
|
movq $VM_MAXUSER_ADDRESS-4,%rax
|
|
cmpq %rax,%rsi
|
|
ja futex_fault
|
|
stac
|
|
movl (%rsi),%eax
|
|
1: movl %eax,%ecx
|
|
xorl %edi,%ecx
|
|
#ifdef SMP
|
|
lock
|
|
#endif
|
|
cmpxchgl %ecx,(%rsi)
|
|
jnz 1b
|
|
clac
|
|
movl %eax,(%rdx)
|
|
xorl %eax,%eax
|
|
movq %rax,PCB_ONFAULT(%r8)
|
|
ret
|
|
END(futex_xorl_smap)
|