135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
/* $NetBSD: ras.h,v 1.14 2008/08/11 21:51:14 skrll Exp $ */
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/*-
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* Copyright (c) 2002, 2004, 2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gregory McGarry.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_RAS_H_
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#define _SYS_RAS_H_
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#ifndef __ASSEMBLER__
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#include <sys/types.h>
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#include <sys/queue.h>
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struct ras {
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struct ras *ras_next;
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void *ras_startaddr;
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void *ras_endaddr;
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};
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#define RAS_INSTALL 0
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#define RAS_PURGE 1
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#define RAS_PURGE_ALL 2
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#else
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#include <sys/cdefs.h>
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#endif /* __ASSEMBLER__ */
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#ifdef _KERNEL
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#ifndef __ASSEMBLER__
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struct proc;
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void *ras_lookup(struct proc *, void *);
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int ras_fork(struct proc *, struct proc *);
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int ras_purgeall(void);
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#endif /* __ASSEMBLER__ */
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#else /* !_KERNEL */
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#ifndef RAS_DECL
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#define RAS_DECL(name) \
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extern void __CONCAT(name,_ras_start(void)), __CONCAT(name,_ras_end(void))
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#endif /* RAS_DECL */
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/*
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* RAS_START and RAS_END contain implicit instruction reordering
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* barriers. See __insn_barrier() in <sys/cdefs.h>.
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*
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* Note: You are strongly advised to avoid coding RASs in C. There is a
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* good chance the compiler will generate code which cannot be restarted.
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*/
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#define RAS_START(name) \
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__asm volatile(".globl " ___STRING(name) "_ras_start\n" \
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___STRING(name) "_ras_start:" \
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::: "memory")
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#define RAS_END(name) \
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__asm volatile(".globl " ___STRING(name) "_ras_end\n" \
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___STRING(name) "_ras_end:" \
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::: "memory")
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#define RAS_ADDR(name) ((void *)(uintptr_t) __CONCAT(name,_ras_start))
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#define RAS_SIZE(name) ((size_t)((uintptr_t) __CONCAT(name,_ras_end) - \
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(uintptr_t) __CONCAT(name,_ras_start)))
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#ifndef __ASSEMBLER__
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__BEGIN_DECLS
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int rasctl(void *, size_t, int);
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__END_DECLS
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#else /* __ASSEMBLER__ */
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#ifndef _ASM_LS_CHAR
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#define _ASM_LS_CHAR ;
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#endif
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/*
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* RAS_START_ASM and RAS_END_ASM are for use within assembly code.
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* This is the prefered method of coding a RAS.
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*/
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#define RAS_START_ASM(name) \
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.globl _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
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_C_LABEL(__CONCAT(name,_ras_start)):
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#define RAS_END_ASM(name) \
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.globl _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
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_C_LABEL(__CONCAT(name,_ras_end)):
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/*
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* RAS_START_ASM_HIDDEN and RAS_END_ASM_HIDDEN are similar to the above,
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* except that they limit the scope of the symbol such that it will not
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* be placed into the dynamic symbol table. Thus no other module (executable
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* or shared library) can reference it directly.
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*/
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#define RAS_START_ASM_HIDDEN(name) \
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.globl _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
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.hidden _C_LABEL(__CONCAT(name,_ras_start)) _ASM_LS_CHAR \
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_C_LABEL(__CONCAT(name,_ras_start)):
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#define RAS_END_ASM_HIDDEN(name) \
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.globl _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
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.hidden _C_LABEL(__CONCAT(name,_ras_end)) _ASM_LS_CHAR \
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_C_LABEL(__CONCAT(name,_ras_end)):
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#endif /* __ASSEMBLER__ */
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#endif /* _KERNEL */
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#endif /* !_SYS_RAS_H_ */
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