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Annotation of sys/arch/amd64/include/asm.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: asm.h,v 1.2 2005/12/13 00:18:19 jsg Exp $     */
                      2: /*     $NetBSD: asm.h,v 1.2 2003/05/02 18:05:47 yamt 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 _AMD64_ASM_H_
                     39: #define _AMD64_ASM_H_
                     40:
                     41: #ifdef PIC
                     42: #define PIC_PLT(x)     x@PLT
                     43: #define PIC_GOT(x)     x@GOTPCREL(%rip)
                     44: #else
                     45: #define PIC_PLT(x)     x
                     46: #define PIC_GOT(x)     x
                     47: #endif
                     48:
                     49: # define _C_LABEL(x)   x
                     50: #define        _ASM_LABEL(x)   x
                     51:
                     52: #define CVAROFF(x,y)           (_C_LABEL(x)+y)(%rip)
                     53:
                     54: #ifdef __STDC__
                     55: # define __CONCAT(x,y) x ## y
                     56: # define __STRING(x)   #x
                     57: #else
                     58: # define __CONCAT(x,y) x/**/y
                     59: # define __STRING(x)   "x"
                     60: #endif
                     61:
                     62: /* let kernels and others override entrypoint alignment */
                     63: #ifndef _ALIGN_TEXT
                     64: #define _ALIGN_TEXT .align 16, 0x90
                     65: #endif
                     66:
                     67: #define _ENTRY(x) \
                     68:        .text; _ALIGN_TEXT; .globl x; .type x,@function; x:
                     69:
                     70: #ifdef _KERNEL
                     71: /* XXX Can't use __CONCAT() here, as it would be evaluated incorrectly. */
                     72: #ifdef __STDC__
                     73: #define        IDTVEC(name) \
                     74:        .text; ALIGN_TEXT; .globl X ## name; .type X ## name,@function; X ## name:
                     75: #else
                     76: #define        IDTVEC(name) \
                     77:        .text; ALIGN_TEXT; .globl X/**/name; .type X/**/name,@function; X/**/name:
                     78: #endif /* __STDC__ */
                     79: #endif /* _KERNEL */
                     80:
                     81: #ifdef __STDC__
                     82: #define CPUVAR(off)    %gs:CPU_INFO_ ## off
                     83: #else
                     84: #define CPUVAR(off)     %gs:CPU_INFO_/**/off
                     85: #endif
                     86:
                     87:
                     88: #ifdef GPROF
                     89: # define _PROF_PROLOGUE        \
                     90:        pushq %rbp; leaq (%rsp),%rbp; call PIC_PLT(__mcount); popq %rbp
                     91: #else
                     92: # define _PROF_PROLOGUE
                     93: #endif
                     94:
                     95: #define        ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
                     96: #define        NENTRY(y)       _ENTRY(_C_LABEL(y))
                     97: #define        ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
                     98:
                     99: #define        ASMSTR          .asciz
                    100:
                    101: #define RCSID(x)       .text; .asciz x
                    102:
                    103: #define        WEAK_ALIAS(alias,sym)                                           \
                    104:        .weak alias;                                                    \
                    105:        alias = sym
                    106:
                    107: /* XXXfvdl do not use stabs here */
                    108: #ifdef __STDC__
                    109: #define        WARN_REFERENCES(sym,msg)                                        \
                    110:        .stabs msg ## ,30,0,0,0 ;                                       \
                    111:        .stabs __STRING(_C_LABEL(sym)) ## ,1,0,0,0
                    112: #else
                    113: #define        WARN_REFERENCES(sym,msg)                                        \
                    114:        .stabs msg,30,0,0,0 ;                                           \
                    115:        .stabs __STRING(sym),1,0,0,0
                    116: #endif /* __STDC__ */
                    117:
                    118: #endif /* !_AMD64_ASM_H_ */