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Annotation of sys/arch/i386/include/asm.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: asm.h,v 1.10 2007/05/27 18:34:01 art Exp $    */
                      2: /*     $NetBSD: asm.h,v 1.7 1994/10/27 04:15:56 cgd Exp $      */
                      3:
                      4: /*-
                      5:  * Copyright (c) 1990 The Regents of the University of California.
                      6:  * All rights reserved.
                      7:  *
                      8:  * This code is derived from software contributed to Berkeley by
                      9:  * William Jolitz.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  *
                     35:  *     @(#)asm.h       5.5 (Berkeley) 5/7/91
                     36:  */
                     37:
                     38: #ifndef _I386_ASM_H_
                     39: #define _I386_ASM_H_
                     40:
                     41: #ifdef PIC
                     42: #define PIC_PROLOGUE   \
                     43:        pushl   %ebx;   \
                     44:        call    666f;   \
                     45: 666:                   \
                     46:        popl    %ebx;   \
                     47:        addl    $_C_LABEL(_GLOBAL_OFFSET_TABLE_)+[.-666b], %ebx
                     48: #define PIC_EPILOGUE   \
                     49:        popl    %ebx
                     50: #define PIC_PLT(x)     x@PLT
                     51: #define PIC_GOT(x)     x@GOT(%ebx)
                     52: #define PIC_GOTOFF(x)  x@GOTOFF(%ebx)
                     53: #else
                     54: #define PIC_PROLOGUE
                     55: #define PIC_EPILOGUE
                     56: #define PIC_PLT(x)     x
                     57: #define PIC_GOT(x)     x
                     58: #define PIC_GOTOFF(x)  x
                     59: #endif
                     60:
                     61: #define _C_LABEL(name) name
                     62: #define        _ASM_LABEL(x)   x
                     63:
                     64: #define CVAROFF(x, y)  _C_LABEL(x) + y
                     65:
                     66: #ifdef __STDC__
                     67: # define __CONCAT(x,y) x ## y
                     68: # define __STRING(x)   #x
                     69: #else
                     70: # define __CONCAT(x,y) x/**/y
                     71: # define __STRING(x)   "x"
                     72: #endif
                     73:
                     74: /*
                     75:  * WEAK ALIAS: create a weak alias
                     76:  */
                     77: #define WEAK_ALIAS(alias,sym) \
                     78:        .weak alias; \
                     79:        alias = sym
                     80:
                     81: /*
                     82:  * WARN_REFERENCES: create a warning if the specified symbol is referenced
                     83:  */
                     84: #define WARN_REFERENCES(_sym,_msg)     \
                     85:        .section .gnu.warning. ## _sym ; .ascii _msg ; .text
                     86:
                     87: /* let kernels and others override entrypoint alignment */
                     88: #ifndef _ALIGN_TEXT
                     89: # define _ALIGN_TEXT .align 2, 0x90
                     90: #endif
                     91:
                     92: #define _ENTRY(x) \
                     93:        .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
                     94:
                     95: #if defined(PROF) || defined(GPROF)
                     96: # define _PROF_PROLOGUE        \
                     97:        pushl %ebp; movl %esp,%ebp; call PIC_PLT(mcount); popl %ebp
                     98: #else
                     99: # define _PROF_PROLOGUE
                    100: #endif
                    101:
                    102: #define        ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
                    103: #define        NENTRY(y)       _ENTRY(_C_LABEL(y))
                    104: #define        ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
                    105: #define        NASENTRY(y)     _ENTRY(_ASM_LABEL(y))
                    106:
                    107: #define        ALTENTRY(name)  .globl _C_LABEL(name); _C_LABEL(name):
                    108:
                    109: #define        ASMSTR          .asciz
                    110:
                    111: #define RCSID(x)       .text; .asciz x
                    112:
                    113: #ifdef _KERNEL
                    114:
                    115: #ifdef MULTIPROCESSOR
                    116: #define CPUVAR(var)    %fs:__CONCAT(CPU_INFO_,var)
                    117: #else
                    118: #define CPUVAR(var)    _C_LABEL(cpu_info_primary)+__CONCAT(CPU_INFO_,var)
                    119: #endif
                    120:
                    121: #endif /* _KERNEL */
                    122:
                    123: #endif /* !_I386_ASM_H_ */