FreeBSD/Linux Kernel Cross Reference
sys/contrib/openzfs/lib/libspl/include/os/linux/sys/ia32/asm_linkage.h

     /*
      * CDDL HEADER START
      *
      * The contents of this file are subject to the terms of the
      * Common Development and Distribution License (the "License").
      * You may not use this file except in compliance with the License.
      *
      * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      * or https://opensource.org/licenses/CDDL-1.0.
     * See the License for the specific language governing permissions
     * and limitations under the License.
     *
     * When distributing Covered Code, include this CDDL HEADER in each
     * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     * If applicable, add the following below this CDDL HEADER, with the
     * fields enclosed by brackets "[]" replaced with your own identifying
     * information: Portions Copyright [yyyy] [name of copyright owner]
     *
     * CDDL HEADER END
     */
    
    /*
     * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     * Use is subject to license terms.
     */
    
    #ifndef _IA32_SYS_ASM_LINKAGE_H
    #define _IA32_SYS_ASM_LINKAGE_H
    
    #if defined(_KERNEL) && defined(__linux__)
    #include <linux/linkage.h>
    #endif
    
    #ifndef ENDBR
    #if defined(__ELF__) && defined(__CET__) && defined(__has_include)
    /* CSTYLED */
    #if __has_include(<cet.h>)
    
    #include <cet.h>
    
    #ifdef _CET_ENDBR
    #define ENDBR   _CET_ENDBR
    #endif /* _CET_ENDBR */
    
    #endif /* <cet.h> */
    #endif /* __ELF__ && __CET__ && __has_include */
    #endif /* !ENDBR */
    
    #ifndef ENDBR
    #define ENDBR
    #endif
    #ifndef RET
    #define RET     ret
    #endif
    
    /* You can set to nothing on Unix platforms */
    #undef ASMABI
    #define ASMABI  __attribute__((sysv_abi))
    
    #define SECTION_TEXT .text
    #define SECTION_STATIC .section .rodata
    
    #ifdef  __cplusplus
    extern "C" {
    #endif
    
    #ifdef _ASM     /* The remainder of this file is only for assembly files */
    
    /*
     * make annoying differences in assembler syntax go away
     */
    
    /*
     * D16 and A16 are used to insert instructions prefixes; the
     * macros help the assembler code be slightly more portable.
     */
    #if !defined(__GNUC_AS__)
    /*
     * /usr/ccs/bin/as prefixes are parsed as separate instructions
     */
    #define D16     data16;
    #define A16     addr16;
    
    /*
     * (There are some weird constructs in constant expressions)
     */
    #define _CONST(const)           [const]
    #define _BITNOT(const)          -1!_CONST(const)
    #define _MUL(a, b)              _CONST(a \* b)
    
    #else
    /*
     * Why not use the 'data16' and 'addr16' prefixes .. well, the
     * assembler doesn't quite believe in real mode, and thus argues with
     * us about what we're trying to do.
     */
    #define D16     .byte   0x66;
    #define A16     .byte   0x67;
    
   #define _CONST(const)           (const)
   #define _BITNOT(const)          ~_CONST(const)
   #define _MUL(a, b)              _CONST(a * b)
   
   #endif
   
   /*
    * C pointers are different sizes between i386 and amd64.
    * These constants can be used to compute offsets into pointer arrays.
    */
   #if defined(__amd64)
   #define CLONGSHIFT      3
   #define CLONGSIZE       8
   #define CLONGMASK       7
   #elif defined(__i386)
   #define CLONGSHIFT      2
   #define CLONGSIZE       4
   #define CLONGMASK       3
   #endif
   
   /*
    * Since we know we're either ILP32 or LP64 ..
    */
   #define CPTRSHIFT       CLONGSHIFT
   #define CPTRSIZE        CLONGSIZE
   #define CPTRMASK        CLONGMASK
   
   #if CPTRSIZE != (1 << CPTRSHIFT) || CLONGSIZE != (1 << CLONGSHIFT)
   #error  "inconsistent shift constants"
   #endif
   
   #if CPTRMASK != (CPTRSIZE - 1) || CLONGMASK != (CLONGSIZE - 1)
   #error  "inconsistent mask constants"
   #endif
   
   #define ASM_ENTRY_ALIGN 16
   
   /*
    * SSE register alignment and save areas
    */
   
   #define XMM_SIZE        16
   #define XMM_ALIGN       16
   
   /*
    * ENTRY provides the standard procedure entry code and an easy way to
    * insert the calls to mcount for profiling. ENTRY_NP is identical, but
    * never calls mcount.
    */
   #undef ENTRY
   #define ENTRY(x) \
           .text; \
           .balign ASM_ENTRY_ALIGN; \
           .globl  x; \
           .type   x, @function; \
   x:      MCOUNT(x)
   
   #define ENTRY_NP(x) \
           .text; \
           .balign ASM_ENTRY_ALIGN; \
           .globl  x; \
           .type   x, @function; \
   x:
   
   #define ENTRY_ALIGN(x, a) \
           .text; \
           .balign a; \
           .globl  x; \
           .type   x, @function; \
   x:
   
   #define FUNCTION(x) \
           .type   x, @function; \
   x:
   
   /*
    * ENTRY2 is identical to ENTRY but provides two labels for the entry point.
    */
   #define ENTRY2(x, y) \
           .text;  \
           .balign ASM_ENTRY_ALIGN; \
           .globl  x, y; \
           .type   x, @function; \
           .type   y, @function; \
   x:; \
   y:      MCOUNT(x)
   
   #define ENTRY_NP2(x, y) \
           .text; \
           .balign ASM_ENTRY_ALIGN; \
           .globl  x, y; \
           .type   x, @function; \
           .type   y, @function; \
   x:; \
   y:
   
   
   /*
    * SET_SIZE trails a function and set the size for the ELF symbol table.
    */
   #define SET_SIZE(x) \
           .size   x, [.-x]
   
   #define SET_OBJ(x) .type        x, @object
   
   #endif /* _ASM */
   
   #ifdef  __cplusplus
   }
   #endif
   
   #endif  /* _IA32_SYS_ASM_LINKAGE_H */

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