sys/arch/arm/include/asm.h

   1 /*      $NetBSD: asm.h,v 1.16 2012/09/01 14:46:25 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 __BIT(n)        (1 << (n))
  43 #define __BITS(hi,lo)   ((~((~0)<<((hi)+1)))&((~0)<<(lo)))
  44
  45 #define _C_LABEL(x)     x
  46 #define _ASM_LABEL(x)   x
  47
  48 #ifdef __STDC__
  49 # define __CONCAT(x,y)  x ## y
  50 # define __STRING(x)    #x
  51 #else
  52 # define __CONCAT(x,y)  x/**/y
  53 # define __STRING(x)    "x"
  54 #endif
  55
  56 #ifndef _ALIGN_TEXT
  57 # define _ALIGN_TEXT .align 0
  58 #endif
  59
  60 /*
  61  * gas/arm uses @ as a single comment character and thus cannot be used here
  62  * Instead it recognised the # instead of an @ symbols in .type directives
  63  * We define a couple of macros so that assembly code will not be dependent
  64  * on one or the other.
  65  */
  66 #define _ASM_TYPE_FUNCTION      %function
  67 #define _ASM_TYPE_OBJECT        %object
  68 #ifdef __thumb__
  69 #define _ENTRY(x) \
  70         .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; .thumb_func; x:
  71 #else
  72 #define _ENTRY(x) \
  73         .text; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; x:
  74 #endif
  75 #define _END(x)         .size x,.-x
  76
  77 #ifdef GPROF
  78 # define _PROF_PROLOGUE \
  79         mov ip, lr; bl __mcount
  80 #else
  81 # define _PROF_PROLOGUE
  82 #endif
  83
  84 #define ENTRY(y)        _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
  85 #define ENTRY_NP(y)     _ENTRY(_C_LABEL(y))
  86 #define END(y)          _END(_C_LABEL(y))
  87 #define ASENTRY(y)      _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
  88 #define ASENTRY_NP(y)   _ENTRY(_ASM_LABEL(y))
  89 #define ASEND(y)        _END(_ASM_LABEL(y))
  90
  91 #if defined(__minix)
  92 #define _LABEL(x) \
  93         .globl x; x:
  94 #define LABEL(y)        _LABEL(_C_LABEL(y))
  95
  96 #endif /* defined(__minix) */
  97 #define ASMSTR          .asciz
  98
  99 #if defined(PIC)
 100 #ifdef __thumb__
 101 #define PLT_SYM(x)      x
 102 #define GOT_SYM(x)      PIC_SYM(x, GOTOFF)
 103 #define GOT_GET(x,got,sym)      \
 104         ldr     x, sym;         \
 105         add     x, got;         \
 106         ldr     x, [x]
 107 #else
 108 #define PLT_SYM(x)      PIC_SYM(x, PLT)
 109 #define GOT_SYM(x)      PIC_SYM(x, GOT)
 110 #define GOT_GET(x,got,sym)      \
 111         ldr     x, sym;         \
 112         ldr     x, [x, got]
 113 #endif /* __thumb__ */
 114
 115 #define GOT_INIT(got,gotsym,pclabel) \
 116         ldr     got, gotsym;    \
 117         add     got, got, pc;   \
 118         pclabel:
 119 #define GOT_INITSYM(gotsym,pclabel) \
 120         gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) + (. - (pclabel+4))
 121
 122 #ifdef __STDC__
 123 #define PIC_SYM(x,y)    x ## ( ## y ## )
 124 #else
 125 #define PIC_SYM(x,y)    x/**/(/**/y/**/)
 126 #endif
 127
 128 #else
 129 #define PLT_SYM(x)      x
 130 #define GOT_SYM(x)      x
 131 #define GOT_GET(x,got,sym)      \
 132         ldr     x, sym;
 133 #define GOT_INIT(got,gotsym,pclabel)
 134 #define GOT_INITSYM(gotsym,pclabel)
 135 #define PIC_SYM(x,y)    x
 136 #endif  /* PIC */
 137
 138 #define RCSID(x)        .pushsection ".ident"; .asciz x; .popsection
 139
 140 #define WEAK_ALIAS(alias,sym)                                           \
 141         .weak alias;                                                    \
 142         alias = sym
 143
 144 /*
 145  * STRONG_ALIAS: create a strong alias.
 146  */
 147 #define STRONG_ALIAS(alias,sym)                                         \
 148         .globl alias;                                                   \
 149         alias = sym
 150
 151 #ifdef __STDC__
 152 #define WARN_REFERENCES(sym,msg)                                        \
 153         .pushsection .gnu.warning. ## sym;                              \
 154         .ascii msg;                                                     \
 155         .popsection
 156 #else
 157 #define WARN_REFERENCES(sym,msg)                                        \
 158         .pushsection .gnu.warning./**/sym;                              \
 159         .ascii msg;                                                     \
 160         .popsection
 161 #endif /* __STDC__ */
 162
 163 #ifdef __thumb__
 164 # define XPUSH          push
 165 # define XPOP           pop
 166 # define XPOPRET        pop     {pc}
 167 #else
 168 # define XPUSH          stmfd   sp!,
 169 # define XPOP           ldmfd   sp!,
 170 # ifdef _ARM_ARCH_5
 171 #  define XPOPRET       ldmfd   sp!, {pc}
 172 # else
 173 #  define XPOPRET       ldmfd   sp!, {lr}; mov pc, lr
 174 # endif
 175 #endif
 176
 177 #if defined (_ARM_ARCH_4T)
 178 # define RET            bx              lr
 179 # define RETc(c)        __CONCAT(bx,c)  lr
 180 #else
 181 # define RET            mov             pc, lr
 182 # define RETc(c)        __CONCAT(mov,c) pc, lr
 183 #endif
 184
 185 #ifdef __minix
 186 #define IMPORT(sym)               \
 187         .extern _C_LABEL(sym)
 188 #endif
 189
 190 #endif /* !_ARM_ASM_H_ */