asm.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by
    8  * William Jolitz.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)DEFS.h        5.1 (Berkeley) 4/23/90
   35  * $FreeBSD$
   36  */
   37 
   38 #ifdef __i386__
   39 #include <i386/asm.h>
   40 #else /* !__i386__ */
   41 
   42 #ifndef _MACHINE_ASM_H_
   43 #define _MACHINE_ASM_H_
   44 
   45 #include <sys/cdefs.h>
   46 
   47 #ifdef PIC
   48 #define PIC_PLT(x)      x@PLT
   49 #define PIC_GOT(x)      x@GOTPCREL(%rip)
   50 #else
   51 #define PIC_PLT(x)      x
   52 #endif
   53 
   54 /*
   55  * CNAME and HIDENAME manage the relationship between symbol names in C
   56  * and the equivalent assembly language names.  CNAME is given a name as
   57  * it would be used in a C program.  It expands to the equivalent assembly
   58  * language name.  HIDENAME is given an assembly-language name, and expands
   59  * to a possibly-modified form that will be invisible to C programs.
   60  */
   61 #define CNAME(csym)             csym
   62 #define HIDENAME(asmsym)        .asmsym
   63 
   64 #define _START_ENTRY    .text; .p2align 4,0x90
   65 
   66 #define _ENTRY(x)       _START_ENTRY; \
   67                         .globl CNAME(x); .type CNAME(x),@function; CNAME(x):; \
   68                         .cfi_startproc
   69 
   70 #ifdef PROF
   71 #define ALTENTRY(x)     _ENTRY(x); \
   72                         pushq %rbp; \
   73                         .cfi_def_cfa_offset 16; \
   74                         .cfi_offset %rbp, -16; \
   75                         movq %rsp,%rbp; \
   76                         call PIC_PLT(HIDENAME(mcount)); \
   77                         popq %rbp; \
   78                         .cfi_restore %rbp; \
   79                         .cfi_def_cfa_offset 8; \
   80                         jmp 9f
   81 #define ENTRY(x)        _ENTRY(x); \
   82                         pushq %rbp; \
   83                         .cfi_def_cfa_offset 16; \
   84                         .cfi_offset %rbp, -16; \
   85                         movq %rsp,%rbp; \
   86                         call PIC_PLT(HIDENAME(mcount)); \
   87                         popq %rbp; \
   88                         .cfi_restore %rbp; \
   89                         .cfi_def_cfa_offset 8; \
   90                         9:
   91 #else
   92 #define ALTENTRY(x)     _ENTRY(x)
   93 #define ENTRY(x)        _ENTRY(x)
   94 #endif
   95 
   96 #define END(x)          .size x, . - x; .cfi_endproc
   97 /*
   98  * WEAK_REFERENCE(): create a weak reference alias from sym. 
   99  * The macro is not a general asm macro that takes arbitrary names,
  100  * but one that takes only C names. It does the non-null name
  101  * translation inside the macro.
  102  */
  103 #define WEAK_REFERENCE(sym, alias)                                      \
  104         .weak CNAME(alias);                                             \
  105         .equ CNAME(alias),CNAME(sym)
  106 
  107 #define RCSID(x)        .text; .asciz x
  108 
  109 #undef __FBSDID
  110 #if !defined(STRIP_FBSDID)
  111 #define __FBSDID(s)     .ident s
  112 #else
  113 #define __FBSDID(s)     /* nothing */
  114 #endif /* !STRIP_FBSDID */
  115 
  116 #endif /* !_MACHINE_ASM_H_ */
  117 
  118 #endif /* __i386__ */

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FreeBSD/Linux Kernel Cross Reference sys/amd64/include/asm.h

FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/asm.h