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43569ee374
Resolve straight-line speculation warnings reported by objtool for x86_64 assembly on Linux when CONFIG_SLS is set. See the following LWN article for the complete details. https://lwn.net/Articles/877845/ Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #13528 Closes #13575
174 lines
3.7 KiB
C
174 lines
3.7 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _IA32_SYS_ASM_LINKAGE_H
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#define _IA32_SYS_ASM_LINKAGE_H
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#include <sys/stack.h>
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#include <sys/trap.h>
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#if defined(__linux__) && defined(CONFIG_SLS)
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#define RET ret; int3
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#else
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#define RET ret
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef _ASM /* The remainder of this file is only for assembly files */
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/*
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* make annoying differences in assembler syntax go away
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*/
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/*
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* D16 and A16 are used to insert instructions prefixes; the
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* macros help the assembler code be slightly more portable.
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*/
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#if !defined(__GNUC_AS__)
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/*
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* /usr/ccs/bin/as prefixes are parsed as separate instructions
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*/
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#define D16 data16;
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#define A16 addr16;
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/*
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* (There are some weird constructs in constant expressions)
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*/
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#define _CONST(const) [const]
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#define _BITNOT(const) -1!_CONST(const)
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#define _MUL(a, b) _CONST(a \* b)
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#else
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/*
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* Why not use the 'data16' and 'addr16' prefixes .. well, the
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* assembler doesn't quite believe in real mode, and thus argues with
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* us about what we're trying to do.
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*/
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#define D16 .byte 0x66;
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#define A16 .byte 0x67;
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#define _CONST(const) (const)
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#define _BITNOT(const) ~_CONST(const)
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#define _MUL(a, b) _CONST(a * b)
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#endif
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/*
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* C pointers are different sizes between i386 and amd64.
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* These constants can be used to compute offsets into pointer arrays.
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*/
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#if defined(__amd64)
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#define CLONGSHIFT 3
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#define CLONGSIZE 8
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#define CLONGMASK 7
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#elif defined(__i386)
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#define CLONGSHIFT 2
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#define CLONGSIZE 4
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#define CLONGMASK 3
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#endif
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/*
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* Since we know we're either ILP32 or LP64 ..
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*/
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#define CPTRSHIFT CLONGSHIFT
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#define CPTRSIZE CLONGSIZE
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#define CPTRMASK CLONGMASK
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#if CPTRSIZE != (1 << CPTRSHIFT) || CLONGSIZE != (1 << CLONGSHIFT)
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#error "inconsistent shift constants"
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#endif
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#if CPTRMASK != (CPTRSIZE - 1) || CLONGMASK != (CLONGSIZE - 1)
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#error "inconsistent mask constants"
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#endif
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#define ASM_ENTRY_ALIGN 16
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/*
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* SSE register alignment and save areas
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*/
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#define XMM_SIZE 16
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#define XMM_ALIGN 16
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/*
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* ENTRY provides the standard procedure entry code and an easy way to
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* insert the calls to mcount for profiling. ENTRY_NP is identical, but
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* never calls mcount.
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*/
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#define ENTRY(x) \
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.text; \
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.align ASM_ENTRY_ALIGN; \
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.globl x; \
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.type x, @function; \
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x: MCOUNT(x)
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#define ENTRY_NP(x) \
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.text; \
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.align ASM_ENTRY_ALIGN; \
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.globl x; \
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.type x, @function; \
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x:
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/*
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* ENTRY2 is identical to ENTRY but provides two labels for the entry point.
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*/
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#define ENTRY2(x, y) \
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.text; \
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.align ASM_ENTRY_ALIGN; \
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.globl x, y; \
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.type x, @function; \
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.type y, @function; \
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x:; \
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y: MCOUNT(x)
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#define ENTRY_NP2(x, y) \
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.text; \
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.align ASM_ENTRY_ALIGN; \
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.globl x, y; \
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.type x, @function; \
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.type y, @function; \
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x:; \
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y:
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/*
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* SET_SIZE trails a function and set the size for the ELF symbol table.
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*/
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#define SET_SIZE(x) \
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.size x, [.-x]
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#endif /* _ASM */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _IA32_SYS_ASM_LINKAGE_H */
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