sys/arch/arm/include/asm.h

   1 /*      $NetBSD: asm.h,v 1.27 2014/03/04 15:27:58 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 _ARM_ASM_H_
  38 #define _ARM_ASM_H_
  39
  40 #include <arm/cdefs.h>
  41
  42         .syntax         unified
  43
  44 #ifdef __thumb__
  45 #define THUMB_INSN(n)   n
  46 #else
  47 #define THUMB_INSN(n)
  48 #endif
  49
  50 #define __BIT(n)        (1 << (n))
  51 #define __BITS(hi,lo)   ((~((~0)<<((hi)+1)))&((~0)<<(lo)))
  52
  53 #define _C_LABEL(x)     x
  54 #define _ASM_LABEL(x)   x
  55
  56 #ifdef __STDC__
  57 # define __CONCAT(x,y)  x ## y
  58 # define __STRING(x)    #x
  59 #else
  60 # define __CONCAT(x,y)  x/**/y
  61 # define __STRING(x)    "x"
  62 #endif
  63
  64 #ifndef _ALIGN_TEXT
  65 # define _ALIGN_TEXT .align 2
  66 #endif
  67
  68 #ifndef _TEXT_SECTION
  69 #define _TEXT_SECTION   .text
  70 #endif
  71 /*
  72  * gas/arm uses @ as a single comment character and thus cannot be used here
  73  * Instead it recognised the # instead of an @ symbols in .type directives
  74  * We define a couple of macros so that assembly code will not be dependent
  75  * on one or the other.
  76  */
  77 #define _ASM_TYPE_FUNCTION      %function
  78 #define _ASM_TYPE_OBJECT        %object
  79 #define _THUMB_ENTRY(x) \
  80         _TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \
  81         .thumb_func; .code 16; x:
  82 #define _ARM_ENTRY(x) \
  83         _TEXT_SECTION; _ALIGN_TEXT; .globl x; .type x,_ASM_TYPE_FUNCTION; \
  84         .code 32; x:
  85 #ifdef __thumb__
  86 #define _ENTRY(x)       _THUMB_ENTRY(x)
  87 #else
  88 #define _ENTRY(x)       _ARM_ENTRY(x)
  89 #endif
  90 #define _END(x)         .size x,.-x
  91
  92 #ifdef GPROF
  93 # define _PROF_PROLOGUE \
  94         mov ip, lr; bl __mcount
  95 #else
  96 # define _PROF_PROLOGUE
  97 #endif
  98
  99 #define ENTRY(y)                _ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
 100 #define ENTRY_NP(y)             _ENTRY(_C_LABEL(y))
 101 #define END(y)                  _END(_C_LABEL(y))
 102 #define ARM_ENTRY(y)            _ARM_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
 103 #define ARM_ENTRY_NP(y)         _ARM_ENTRY(_C_LABEL(y))
 104 #define THUMB_ENTRY(y)          _THUMB_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
 105 #define THUMB_ENTRY_NP(y)       _THUMB_ENTRY(_C_LABEL(y))
 106 #define ASENTRY(y)              _ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
 107 #define ASENTRY_NP(y)           _ENTRY(_ASM_LABEL(y))
 108 #define ASEND(y)                _END(_ASM_LABEL(y))
 109 #define ARM_ASENTRY(y)          _ARM_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
 110 #define ARM_ASENTRY_NP(y)       _ARM_ENTRY(_ASM_LABEL(y))
 111 #define THUMB_ASENTRY(y)        _THUMB_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
 112 #define THUMB_ASENTRY_NP(y)     _THUMB_ENTRY(_ASM_LABEL(y))
 113
 114 #define ASMSTR          .asciz
 115
 116 #ifdef __PIC__
 117 #define REL_SYM(a, b)   ((a) - (b))
 118 #define PLT_SYM(x)      x
 119 #define GOT_SYM(x)      PIC_SYM(x, GOT)
 120 #define GOT_GET(x,got,sym)      \
 121         ldr     x, sym;         \
 122         ldr     x, [x, got]
 123 #define GOT_INIT(got,gotsym,pclabel) \
 124         ldr     got, gotsym;    \
 125         pclabel: add    got, got, pc
 126 #ifdef __thumb__
 127 #define GOT_INITSYM(gotsym,pclabel) \
 128         .align 0;               \
 129         gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+4)
 130 #else
 131 #define GOT_INITSYM(gotsym,pclabel) \
 132         .align 0;               \
 133         gotsym: .word _C_LABEL(_GLOBAL_OFFSET_TABLE_) - (pclabel+8)
 134 #endif
 135
 136 #ifdef __STDC__
 137 #define PIC_SYM(x,y)    x ## ( ## y ## )
 138 #else
 139 #define PIC_SYM(x,y)    x/**/(/**/y/**/)
 140 #endif
 141
 142 #else
 143 #define REL_SYM(a, b)   (a)
 144 #define PLT_SYM(x)      x
 145 #define GOT_SYM(x)      x
 146 #define GOT_GET(x,got,sym)      \
 147         ldr     x, sym;
 148 #define GOT_INIT(got,gotsym,pclabel)
 149 #define GOT_INITSYM(gotsym,pclabel)
 150 #define PIC_SYM(x,y)    x
 151 #endif  /* __PIC__ */
 152
 153 #define RCSID(x)        .pushsection ".ident"; .asciz x; .popsection
 154
 155 #define WEAK_ALIAS(alias,sym)                                           \
 156         .weak alias;                                                    \
 157         alias = sym
 158
 159 /*
 160  * STRONG_ALIAS: create a strong alias.
 161  */
 162 #define STRONG_ALIAS(alias,sym)                                         \
 163         .globl alias;                                                   \
 164         alias = sym
 165
 166 #ifdef __STDC__
 167 #define WARN_REFERENCES(sym,msg)                                        \
 168         .pushsection .gnu.warning. ## sym;                              \
 169         .ascii msg;                                                     \
 170         .popsection
 171 #else
 172 #define WARN_REFERENCES(sym,msg)                                        \
 173         .pushsection .gnu.warning./**/sym;                              \
 174         .ascii msg;                                                     \
 175         .popsection
 176 #endif /* __STDC__ */
 177
 178 #ifdef __thumb__
 179 # define XPUSH          push
 180 # define XPOP           pop
 181 # define XPOPRET        pop     {pc}
 182 #else
 183 # define XPUSH          stmfd   sp!,
 184 # define XPOP           ldmfd   sp!,
 185 # ifdef _ARM_ARCH_5
 186 #  define XPOPRET       ldmfd   sp!, {pc}
 187 # else
 188 #  define XPOPRET       ldmfd   sp!, {lr}; mov pc, lr
 189 # endif
 190 #endif
 191
 192 #if defined (_ARM_ARCH_4T)
 193 # define RET            bx              lr
 194 # define RETr(r)        bx              r
 195 # if defined(__thumb__)
 196 #  if defined(_ARM_ARCH_7)
 197 #   define RETc(c)      it c; __CONCAT(bx,c)    lr
 198 #  endif
 199 # else
 200 #  define RETc(c)       __CONCAT(bx,c)  lr
 201 # endif
 202 #else
 203 # define RET            mov             pc, lr
 204 # define RETr(r)        mov             pc, r
 205 # define RETc(c)        __CONCAT(mov,c) pc, lr
 206 #endif
 207
 208 #ifdef _ARM_ARCH_7
 209 #define KMODTRAMPOLINE(n)                       \
 210 _ENTRY(__wrap_ ## n)                            \
 211         movw    ip, #:lower16:n;        \
 212         movt    ip, #:upper16:n;        \
 213         bx      ip
 214 #elif defined(_ARM_ARCH_4T)
 215 #define KMODTRAMPOLINE(n)       \
 216 _ENTRY(__wrap_ ## n)            \
 217         ldr     ip, [pc];       \
 218         bx      ip;             \
 219         .word   n
 220 #else
 221 #define KMODTRAMPOLINE(n)       \
 222 _ENTRY(__wrap_ ## n)            \
 223         ldr     pc, [pc, #-4];  \
 224         .word   n
 225 #endif
 226
 227 #if defined(__minix)
 228 #define IMPORT(sym)               \
 229         .extern _C_LABEL(sym)
 230
 231 #define _LABEL(x) \
 232         .globl x; x:
 233 #define LABEL(y)        _LABEL(_C_LABEL(y))
 234 #endif /* defined(__minix) */
 235
 236 #endif /* !_ARM_ASM_H_ */