86c31aca33
Much like casueword*, except just a plain old swap. Maintains a similar interface to casu(9)- return value -1 (fault), 0 (success), or 1 (fail), and also both ll/sc and LSE variants are implemented. These will be used to implement 32-bit swp/swpb emulation on aarch64. Reveiwed by: andrew Sponsored by: Stormshield Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D39837
72 lines
3.0 KiB
C
72 lines
3.0 KiB
C
/*-
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* Copyright (c) 1995 Bruce D. Evans.
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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. Neither the name of the author nor the names of 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 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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* from: FreeBSD: src/sys/i386/include/md_var.h,v 1.40 2001/07/12
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MD_VAR_H_
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#define _MACHINE_MD_VAR_H_
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extern long Maxmem;
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extern char sigcode[];
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extern int szsigcode;
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extern u_long elf_hwcap;
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extern u_long elf_hwcap2;
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#ifdef COMPAT_FREEBSD32
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extern u_long elf32_hwcap;
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extern u_long elf32_hwcap2;
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#endif
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struct dumperinfo;
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struct minidumpstate;
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int cpu_minidumpsys(struct dumperinfo *, const struct minidumpstate *);
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void generic_bs_fault(void) __asm(__STRING(generic_bs_fault));
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void generic_bs_peek_1(void) __asm(__STRING(generic_bs_peek_1));
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void generic_bs_peek_2(void) __asm(__STRING(generic_bs_peek_2));
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void generic_bs_peek_4(void) __asm(__STRING(generic_bs_peek_4));
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void generic_bs_peek_8(void) __asm(__STRING(generic_bs_peek_8));
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void generic_bs_poke_1(void) __asm(__STRING(generic_bs_poke_1));
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void generic_bs_poke_2(void) __asm(__STRING(generic_bs_poke_2));
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void generic_bs_poke_4(void) __asm(__STRING(generic_bs_poke_4));
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void generic_bs_poke_8(void) __asm(__STRING(generic_bs_poke_8));
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#ifdef _MD_WANT_SWAPWORD
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/*
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* XXX These are implemented primarily for swp/swpb emulation at the moment, and
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* should be used sparingly with consideration -- they aren't implemented for
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* any other platform. If we use them anywhere else, at a minimum they need
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* KASAN/KMSAN interceptors added.
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*/
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int swapueword8(volatile uint8_t *base, uint8_t *val);
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int swapueword32(volatile uint32_t *base, uint32_t *val);
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#endif
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#endif /* !_MACHINE_MD_VAR_H_ */
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