Switch Linux futex emulation to native ucas_int(), remove unecessary
futex-specific assembler routines. Fixes PR/40490. Reviewed by <ad>.
This commit is contained in:
rmind
parent
f7d3fa20ef
commit
f54234d142
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@ -1,4 +1,4 @@
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# $NetBSD: files.linux_amd64,v 1.3 2008/10/26 20:25:49 christos Exp $
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# $NetBSD: files.linux_amd64,v 1.4 2009/02/23 20:28:58 rmind Exp $
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#
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# Config file description for amd64-dependent Linux compat code.
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@ -7,4 +7,3 @@ file compat/linux/arch/amd64/linux_exec_machdep.c compat_linux
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file compat/linux/arch/amd64/linux_machdep.c compat_linux
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file compat/linux/arch/amd64/linux_syscalls.c compat_linux
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file compat/linux/arch/amd64/linux_sysent.c compat_linux
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file compat/linux/arch/amd64/linux_support.S compat_linux
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@ -1,125 +0,0 @@
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/* $NetBSD: linux_support.S,v 1.2 2008/11/20 09:26:06 ad Exp $ */
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/*-
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* Copyright (c) 2007 Konstantin Belousov
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/sys/amd64/linux32/linux32_support.s,v 1.1 2007/05/23 08:33:05 kib Exp $
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*/
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#include <machine/asm.h>
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#include "assym.h"
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#include <sys/errno.h>
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#include <machine/frameasm.h>
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#define GET_CURPCB(reg) \
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movq CPUVAR(CURLWP), reg; \
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movq L_ADDR(reg), reg
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futex_fault_decx:
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GET_CURPCB(%r8)
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futex_fault:
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movq $0,PCB_ONFAULT(%r8)
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movl $-EFAULT,%eax
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ret
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ENTRY(futex_xchgl)
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GET_CURPCB(%r8)
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movq $futex_fault,PCB_ONFAULT(%r8)
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movq $VM_MAXUSER_ADDRESS-4,%rax
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cmpq %rax,%rsi
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ja futex_fault
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xchgl %edi,(%rsi)
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movl %edi,(%rdx)
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xorl %eax,%eax
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movq %rax,PCB_ONFAULT(%r8)
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ret
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ENTRY(futex_addl)
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GET_CURPCB(%r8)
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movq $futex_fault,PCB_ONFAULT(%r8)
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movq $VM_MAXUSER_ADDRESS-4,%rax
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cmpq %rax,%rsi
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ja futex_fault
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lock
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xaddl %edi,(%rsi)
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movl %edi,(%rdx)
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xorl %eax,%eax
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movq %rax,PCB_ONFAULT(%r8)
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ret
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ENTRY(futex_orl)
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GET_CURPCB(%r8)
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movq $futex_fault,PCB_ONFAULT(%r8)
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movq $VM_MAXUSER_ADDRESS-4,%rax
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cmpq %rax,%rsi
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ja futex_fault
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movl (%rsi),%eax
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1: movl %eax,%ecx
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orl %edi,%ecx
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lock
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cmpxchgl %ecx,(%rsi)
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jnz 1b
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movl %eax,(%rdx)
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xorl %eax,%eax
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movq %rax,PCB_ONFAULT(%r8)
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ret
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ENTRY(futex_andl)
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GET_CURPCB(%r8)
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movq $futex_fault,PCB_ONFAULT(%r8)
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movq $VM_MAXUSER_ADDRESS-4,%rax
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cmpq %rax,%rsi
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ja futex_fault
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movl (%rsi),%eax
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1: movl %eax,%ecx
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andl %edi,%ecx
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lock
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cmpxchgl %ecx,(%rsi)
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jnz 1b
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movl %eax,(%rdx)
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xorl %eax,%eax
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movq %rax,PCB_ONFAULT(%r8)
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ret
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ENTRY(futex_xorl)
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GET_CURPCB(%r8)
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movq $futex_fault,PCB_ONFAULT(%r8)
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movq $VM_MAXUSER_ADDRESS-4,%rax
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cmpq %rax,%rsi
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ja futex_fault
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movl (%rsi),%eax
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1: movl %eax,%ecx
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xorl %edi,%ecx
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lock
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cmpxchgl %ecx,(%rsi)
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jnz 1b
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movl %eax,(%rdx)
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xorl %eax,%eax
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movq %rax,PCB_ONFAULT(%r8)
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ret
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@ -1,4 +1,4 @@
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# $NetBSD: files.linux_i386,v 1.9 2008/10/26 16:38:22 christos Exp $
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# $NetBSD: files.linux_i386,v 1.10 2009/02/23 20:28:58 rmind Exp $
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#
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# Config file description for i386-dependent Linux compat code.
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@ -8,4 +8,3 @@ file compat/linux/arch/i386/linux_sysent.c compat_linux
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file compat/linux/arch/i386/linux_commons.c compat_linux
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file compat/linux/arch/i386/linux_ptrace.c compat_linux & ptrace
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file compat/linux/arch/i386/linux_exec_machdep.c compat_linux
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file compat/linux/arch/i386/linux_support.S compat_linux
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@ -1,126 +0,0 @@
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/* $NetBSD: linux_support.S,v 1.4 2008/11/14 15:56:17 ad Exp $ */
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/*-
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* Copyright (c) 2006,2007 Konstantin Belousov
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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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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD: src/sys/i386/linux/linux_support.s,v 1.1 2007/05/23 08:33:06 kib Exp $
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*/
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#include <machine/asm.h>
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#include "assym.h"
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#include <sys/errno.h>
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#include <machine/frameasm.h>
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#define GET_CURPCB(reg) \
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movl CPUVAR(CURLWP), reg; \
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movl L_ADDR(reg), reg
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futex_fault_decx:
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GET_CURPCB(%ecx)
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futex_fault:
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movl $0,PCB_ONFAULT(%ecx)
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movl $-EFAULT,%eax
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ret
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ENTRY(futex_xchgl)
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GET_CURPCB(%ecx)
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movl $futex_fault,PCB_ONFAULT(%ecx)
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movl 4(%esp),%eax
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movl 8(%esp),%edx
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cmpl $VM_MAXUSER_ADDRESS-4,%edx
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ja futex_fault
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xchgl %eax,(%edx)
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movl 12(%esp),%edx
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movl %eax,(%edx)
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xorl %eax,%eax
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movl %eax,PCB_ONFAULT(%ecx)
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ret
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ENTRY(futex_addl)
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GET_CURPCB(%ecx)
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movl $futex_fault,PCB_ONFAULT(%ecx)
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movl 4(%esp),%eax
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movl 8(%esp),%edx
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cmpl $VM_MAXUSER_ADDRESS-4,%edx
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ja futex_fault
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lock
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xaddl %eax,(%edx)
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movl 12(%esp),%edx
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movl %eax,(%edx)
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xorl %eax,%eax
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movl %eax,PCB_ONFAULT(%ecx)
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ret
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ENTRY(futex_orl)
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GET_CURPCB(%ecx)
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movl $futex_fault_decx,PCB_ONFAULT(%ecx)
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movl 8(%esp),%edx
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cmpl $VM_MAXUSER_ADDRESS-4,%edx
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ja futex_fault
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movl (%edx),%eax
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1: movl %eax,%ecx
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orl 4(%esp),%ecx
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lock
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cmpxchgl %ecx,(%edx)
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jnz 1b
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futex_tail:
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movl 12(%esp),%edx
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movl %eax,(%edx)
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xorl %eax,%eax
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GET_CURPCB(%ecx)
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movl %eax,PCB_ONFAULT(%ecx)
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ret
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ENTRY(futex_andl)
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GET_CURPCB(%ecx)
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movl $futex_fault_decx,PCB_ONFAULT(%ecx)
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movl 8(%esp),%edx
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cmpl $VM_MAXUSER_ADDRESS-4,%edx
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ja futex_fault
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movl (%edx),%eax
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1: movl %eax,%ecx
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andl 4(%esp),%ecx
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lock
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cmpxchgl %ecx,(%edx)
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jnz 1b
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jmp futex_tail
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ENTRY(futex_xorl)
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GET_CURPCB(%ecx)
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movl $futex_fault_decx,PCB_ONFAULT(%ecx)
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movl 8(%esp),%edx
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cmpl $VM_MAXUSER_ADDRESS-4,%edx
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ja futex_fault
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movl (%edx),%eax
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1: movl %eax,%ecx
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xorl 4(%esp),%ecx
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lock
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cmpxchgl %ecx,(%edx)
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jnz 1b
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jmp futex_tail
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@ -1,4 +1,4 @@
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/* $NetBSD: linux_futex.c,v 1.22 2009/01/08 12:46:23 njoly Exp $ */
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/* $NetBSD: linux_futex.c,v 1.23 2009/02/23 20:28:58 rmind Exp $ */
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/*-
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* Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved.
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@ -32,7 +32,7 @@
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(1, "$NetBSD: linux_futex.c,v 1.22 2009/01/08 12:46:23 njoly Exp $");
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__KERNEL_RCSID(1, "$NetBSD: linux_futex.c,v 1.23 2009/02/23 20:28:58 rmind Exp $");
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#include <sys/param.h>
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#include <sys/time.h>
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@ -108,13 +108,6 @@ static int futex_sleep(struct futex *, lwp_t *, unsigned long);
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static int futex_wake(struct futex *, int, struct futex *, int);
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static int futex_atomic_op(lwp_t *, int, void *);
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/* from linux_support.S */
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int futex_xchgl(int, void *, int *);
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int futex_addl(int, void *, int *);
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int futex_orl(int, void *, int *);
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int futex_andl(int, void *, int *);
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int futex_xorl(int, void *, int *);
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int
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linux_sys_futex(struct lwp *l, const struct linux_sys_futex_args *uap, register_t *retval)
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{
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@ -436,40 +429,52 @@ futex_wake(struct futex *f, int n, struct futex *newf, int n2)
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static int
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futex_atomic_op(lwp_t *l, int encoded_op, void *uaddr)
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{
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int op = (encoded_op >> 28) & 7;
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int cmp = (encoded_op >> 24) & 15;
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const int op = (encoded_op >> 28) & 7;
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const int cmp = (encoded_op >> 24) & 15;
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const int cmparg = (encoded_op << 20) >> 20;
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int oparg = (encoded_op << 8) >> 20;
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int cmparg = (encoded_op << 20) >> 20;
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int oldval = 0, ret;
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int error, oldval, cval;
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if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
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oparg = 1 << oparg;
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/* XXX: linux verifies access here and returns EFAULT */
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if (copyin(uaddr, &cval, sizeof(int)) != 0)
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return -EFAULT;
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for (;;) {
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int nval;
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switch (op) {
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case FUTEX_OP_SET:
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ret = futex_xchgl(oparg, uaddr, &oldval);
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nval = oparg;
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break;
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case FUTEX_OP_ADD:
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ret = futex_addl(oparg, uaddr, &oldval);
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nval = cval + oparg;
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break;
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case FUTEX_OP_OR:
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ret = futex_orl(oparg, uaddr, &oldval);
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nval = cval | oparg;
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break;
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case FUTEX_OP_ANDN:
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ret = futex_andl(~oparg, uaddr, &oldval);
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nval = cval & ~oparg;
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break;
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case FUTEX_OP_XOR:
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ret = futex_xorl(oparg, uaddr, &oldval);
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nval = cval ^ oparg;
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break;
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default:
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ret = -ENOSYS;
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break;
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return -ENOSYS;
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}
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if (ret)
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return ret;
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error = ucas_int(uaddr, cval, nval, &oldval);
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if (oldval == cval || error) {
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break;
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}
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cval = oldval;
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}
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if (error)
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return -EFAULT;
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switch (cmp) {
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case FUTEX_OP_CMP_EQ:
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