Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/609 Differential Revision: https://reviews.freebsd.org/D35908
179 lines
4.7 KiB
ArmAsm
179 lines
4.7 KiB
ArmAsm
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2018 Turing Robotic Industries Inc.
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* Copyright (C) 2022 Dmitry Chagin <dchagin@FreeBSD.org>
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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 THE AUTHOR 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 AUTHOR 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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* $FreeBSD$
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*/
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#include <machine/asm.h>
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__FBSDID("$FreeBSD$");
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#include <machine/param.h>
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#include <machine/vmparam.h>
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#include <sys/errno.h>
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#include "assym.inc"
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.macro check_user_access user_arg, limit, bad_addr_func
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ldr x7, =(\limit)
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cmp x\user_arg, x7
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b.cs \bad_addr_func
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.endm
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futex_fault:
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SET_FAULT_HANDLER(xzr, x1)
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EXIT_USER_ACCESS_CHECK(w0, x1)
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futex_fault_nopcb:
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mov x0, #EFAULT
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ret
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#define LINUX_FUTEX_MAX_LOOPS 128
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/*
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* int oparg, uint32_t *uaddr, int *oldval
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*
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* Return 0 on success, errno on failure,
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* EAGAIN is returned if LL/SC operation fails.
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*
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* XXX. VM_MAXUSER_ADDRESS is not applicable here, should be replaced
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* by something like LINUX_SHAREDPAGE.
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*/
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/* (int *)uaddr2 = oparg */
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ENTRY(futex_xchgl)
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check_user_access 1, (VM_MAXUSER_ADDRESS-3), futex_fault_nopcb
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adr x9, futex_fault /* Load the fault handler */
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SET_FAULT_HANDLER(x9, x4) /* And set it */
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ENTER_USER_ACCESS(w9, x4)
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mov w5, #LINUX_FUTEX_MAX_LOOPS
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prfm pstl1strm, [x1]
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mov w6, w0 /* Save oparg */
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1: ldxr w4, [x1] /* Load oldval from uaddr */
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stlxr w0, w6, [x1] /* Store oparg to uaddr */
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cbz w0, 3f /* Exit on success */
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sub w5, w5, w0 /* Dec loop counter, w0 is 1 */
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cbnz w5, 1b /* Loop */
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mov x0, #EAGAIN /* Store of newval failed */
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3: dmb ish
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EXIT_USER_ACCESS(w9)
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SET_FAULT_HANDLER(xzr, x9) /* Reset the fault handler */
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str w4, [x2] /* Store oldval */
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ret
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END(futex_xchgl)
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/* (int *)uaddr2 += oparg */
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ENTRY(futex_addl)
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check_user_access 1, (VM_MAXUSER_ADDRESS-3), futex_fault_nopcb
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adr x9, futex_fault
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SET_FAULT_HANDLER(x9, x4)
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ENTER_USER_ACCESS(w9, x4)
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mov w5, #LINUX_FUTEX_MAX_LOOPS
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prfm pstl1strm, [x1]
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mov w6, w0
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1: ldxr w4, [x1]
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add w3, w4, w6 /* oldval + oparg */
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stlxr w0, w3, [x1]
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cbz w0, 3f
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sub w5, w5, w0
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cbnz w5, 1b
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mov x0, #EAGAIN
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3: dmb ish
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EXIT_USER_ACCESS(w9)
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SET_FAULT_HANDLER(xzr, x9)
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str w4, [x2]
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ret
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END(futex_addl)
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/* (int *)uaddr2 |= oparg */
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ENTRY(futex_orl)
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check_user_access 1, (VM_MAXUSER_ADDRESS-3), futex_fault_nopcb
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adr x9, futex_fault
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SET_FAULT_HANDLER(x9, x4)
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ENTER_USER_ACCESS(w9, x4)
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mov w5, #LINUX_FUTEX_MAX_LOOPS
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prfm pstl1strm, [x1]
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mov w6, w0
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1: ldxr w4, [x1]
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orr w3, w4, w6 /* oldavl |= oparg */
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stlxr w0, w3, [x1]
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cbz w0, 3f
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sub w5, w5, w0
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cbnz w5, 1b
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mov x0, #EAGAIN
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3: dmb ish
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EXIT_USER_ACCESS(w9)
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SET_FAULT_HANDLER(xzr, x9)
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str w4, [x2]
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ret
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END(futex_orl)
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/* (int *)uaddr2 &= oparg */
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ENTRY(futex_andl)
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check_user_access 1, (VM_MAXUSER_ADDRESS-3), futex_fault_nopcb
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adr x9, futex_fault
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SET_FAULT_HANDLER(x9, x4)
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ENTER_USER_ACCESS(w9, x4)
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mov w5, #LINUX_FUTEX_MAX_LOOPS
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prfm pstl1strm, [x1]
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mov w6, w0
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1: ldxr w4, [x1]
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and w3, w4, w6 /* oldval &= oparg */
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stlxr w0, w3, [x1]
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cbz w0, 3f
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sub w5, w5, w0
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cbnz w5, 1b
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mov x0, #EAGAIN
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3: dmb ish
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EXIT_USER_ACCESS(w9)
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SET_FAULT_HANDLER(xzr, x9)
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str w4, [x2]
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ret
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END(futex_andl)
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/* (int *)uaddr2 ^= oparg */
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ENTRY(futex_xorl)
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check_user_access 1, (VM_MAXUSER_ADDRESS-3), futex_fault_nopcb
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adr x9, futex_fault
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SET_FAULT_HANDLER(x9, x4)
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ENTER_USER_ACCESS(w9, x4)
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mov w5, #LINUX_FUTEX_MAX_LOOPS
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prfm pstl1strm, [x1]
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mov w6, w0
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1: ldxr w4, [x1]
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eor w3, w4, w6 /* oldval ^= oparg */
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stlxr w0, w3, [x1]
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cbz w0, 3f
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sub w5, w5, w0
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cbnz w5, 1b
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mov x0, #EAGAIN
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3: dmb ish
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EXIT_USER_ACCESS(w9)
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SET_FAULT_HANDLER(xzr, x9)
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str w4, [x2]
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ret
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END(futex_xorl)
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