sys/arch/arm/include/asm.h

   1 /*      $NetBSD: asm.h,v 1.11 2008/04/27 18:58:44 matt Exp $    */
   2
   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: @(#)asm.h 5.5 (Berkeley) 5/7/91
  35  */
  36
  37 #ifndef _ARM32_ASM_H_
  38 #define _ARM32_ASM_H_
  39
  40 #include <arm/cdefs.h>
  41
  42 #define _C_LABEL(x)     x
  43 #define _ASM_LABEL(x)   x
  44
  45 #ifdef __STDC__
  46 # define __CONCAT(x,y)  x ## y
  47 # define __STRING(x)    #x
  48 #else
  49 # define __CONCAT(x,y)  x/**/y
  50 # define __STRING(x)    "x"
  51 #endif
  52
  53 #ifndef _ALIGN_TEXT
  54 # define _ALIGN_TEXT .align 0
  55 #endif
  56
  57 /*
  58  * gas/arm uses @ as a single comment character and thus cannot be used here
  59  * Instead it recognised the # instead of an @ symbols in .type directives
  60  * We define a couple of macros so that assembly code will not be dependant
  61  * on one or the other.
  62  */
  63 #define _ASM_TYPE_FUNCTION      %function
  64 #define _ASM_TYPE_OBJECT        %object
  65 #ifdef __thumb__
  66 #define _ENTRY(x) \
  67         .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; .thumb_func; x:
  68 #else
  69 #define _ENTRY(x) \
  70         .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x:
  71 #endif
  72 #define _END(x)         .size x,.-x
  73
  74 #ifdef GPROF
  75 # define _PROF_PROLOGUE \
  76         mov ip, lr; bl __mcount
  77 #else
  78 # define _PROF_PROLOGUE
  79 #endif
  80
  81 #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
  82 #define ENTRY_NP(y)     _ENTRY(_C_LABEL(y))
  83 #define END(y)          _END(_C_LABEL(y))
  84 #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
  85 #define ASENTRY_NP(y)   _ENTRY(_ASM_LABEL(y))
  86 #define ASEND(y)        _END(_ASM_LABEL(y))
  87
  88 #define ASMSTR          .asciz
  89
  90 #if defined(PIC)
  91 #ifdef __thumb__
  92 #define PLT_SYM(x)      x
  93 #define GOT_SYM(x)      PIC_SYM(x, GOTOFF)
  94 #define GOT_GET(x,got,sym)      \
  95         ldr     x, sym;         \
  96         add     x, got;         \
  97         ldr     x, [x]
  98 #else
  99 #define PLT_SYM(x)      PIC_SYM(x, PLT)
 100 #define GOT_SYM(x)      PIC_SYM(x, GOT)
 101 #define GOT_GET(x,got,sym)      \
 102         ldr     x, sym;         \
 103         ldr     x, [x, got]
 104 #endif /* __thumb__ */
 105
 106 #define GOT_INIT(got,gotsym,pclabel) \
 107         ldr     got, gotsym;    \
 108         add     got, got, pc;   \
 109         pclabel:
 110 #define GOT_INITSYM(gotsym,pclabel) \
 111         gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (pclabel+4))
 112
 113 #ifdef __STDC__
 114 #define PIC_SYM(x,y)    x ## ( ## y ## )
 115 #else
 116 #define PIC_SYM(x,y)    x/**/(/**/y/**/)
 117 #endif
 118
 119 #else
 120 #define PLT_SYM(x)      x
 121 #define GOT_SYM(x)      x
 122 #define GOT_GET(x,got,sym)      \
 123         ldr     x, sym;
 124 #define GOT_INIT(got,gotsym,pclabel)
 125 #define GOT_INITSYM(gotsym,pclabel)
 126 #define PIC_SYM(x,y)    x
 127 #endif  /* PIC */
 128
 129 #define RCSID(x)        .pushsection ".ident"; .asciz x; .popsection
 130
 131 #define WEAK_ALIAS(alias,sym)                                           \
 132         .weak alias;                                                    \
 133         alias = sym
 134
 135 /*
 136  * STRONG_ALIAS: create a strong alias.
 137  */
 138 #define STRONG_ALIAS(alias,sym)                                         \
 139         .globl alias;                                                   \
 140         alias = sym
 141
 142 #define WARN_REFERENCES(sym,msg)                                        \
 143         .stabs msg,30,0,0,0 ;                                           \
 144         .stabs __STRING(_C_LABEL(sym)),1,0,0,0
 145
 146 #ifdef __thumb__
 147 # define XPUSH          push
 148 # define XPOP           pop
 149 # define XPOPRET        pop     {pc}
 150 #else
 151 # define XPUSH          stmfd   sp!,
 152 # define XPOP           ldmfd   sp!,
 153 # ifdef _ARM_ARCH_5
 154 #  define XPOPRET       ldmfd   sp!, {pc}
 155 # else
 156 #  define XPOPRET       ldmfd   sp!, {lr}; mov pc, lr
 157 # endif
 158 #endif
 159
 160 #if defined (_ARM_ARCH_4T)
 161 # define RET            bx              lr
 162 # define RETc(c)        __CONCAT(bx,c)  lr
 163 #else
 164 # define RET            mov             pc, lr
 165 # define RETc(c)        __CONCAT(mov,c) pc, lr
 166 #endif
 167
 168 #endif /* !_ARM_ASM_H_ */