arch/nios2/include/asm/asm-macros.h

   1 /*
   2  * Macro used to simplify coding multi-line assembler.
   3  * Some of the bit test macro can simplify down to one line
   4  * depending on the mask value.
   5  *
   6  * Copyright (C) 2004 Microtronix Datacom Ltd.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  */
  22 #ifndef _ASM_NIOS2_ASMMACROS_H
  23 #define _ASM_NIOS2_ASMMACROS_H
  24 /*
  25  * ANDs reg2 with mask and places the result in reg1.
  26  *
  27  * You cannnot use the same register for reg1 & reg2.
  28  */
  29
  30 .macro ANDI32   reg1, reg2, mask
  31 .if \mask & 0xffff
  32         .if \mask & 0xffff0000
  33                 movhi   \reg1, %hi(\mask)
  34                 movui   \reg1, %lo(\mask)
  35                 and     \reg1, \reg1, \reg2
  36         .else
  37                 andi    \reg1, \reg2, %lo(\mask)
  38         .endif
  39 .else
  40         andhi   \reg1, \reg2, %hi(\mask)
  41 .endif
  42 .endm
  43
  44 /*
  45  * ORs reg2 with mask and places the result in reg1.
  46  *
  47  * It is safe to use the same register for reg1 & reg2.
  48  */
  49
  50 .macro ORI32    reg1, reg2, mask
  51 .if \mask & 0xffff
  52         .if \mask & 0xffff0000
  53                 orhi    \reg1, \reg2, %hi(\mask)
  54                 ori     \reg1, \reg2, %lo(\mask)
  55         .else
  56                 ori     \reg1, \reg2, %lo(\mask)
  57         .endif
  58 .else
  59         orhi    \reg1, \reg2, %hi(\mask)
  60 .endif
  61 .endm
  62
  63 /*
  64  * XORs reg2 with mask and places the result in reg1.
  65  *
  66  * It is safe to use the same register for reg1 & reg2.
  67  */
  68
  69 .macro XORI32   reg1, reg2, mask
  70 .if \mask & 0xffff
  71         .if \mask & 0xffff0000
  72                 xorhi   \reg1, \reg2, %hi(\mask)
  73                 xori    \reg1, \reg1, %lo(\mask)
  74         .else
  75                 xori    \reg1, \reg2, %lo(\mask)
  76         .endif
  77 .else
  78         xorhi   \reg1, \reg2, %hi(\mask)
  79 .endif
  80 .endm
  81
  82 /*
  83  * This is a support macro for BTBZ & BTBNZ.  It checks
  84  * the bit to make sure it is valid 32 value.
  85  *
  86  * It is safe to use the same register for reg1 & reg2.
  87  */
  88
  89 .macro BT       reg1, reg2, bit
  90 .if \bit > 31
  91         .err
  92 .else
  93         .if \bit < 16
  94                 andi    \reg1, \reg2, (1 << \bit)
  95         .else
  96                 andhi   \reg1, \reg2, (1 << (\bit - 16))
  97         .endif
  98 .endif
  99 .endm
 100
 101 /*
 102  * Tests the bit in reg2 and branches to label if the
 103  * bit is zero.  The result of the bit test is stored in reg1.
 104  *
 105  * It is safe to use the same register for reg1 & reg2.
 106  */
 107
 108 .macro BTBZ     reg1, reg2, bit, label
 109         BT      \reg1, \reg2, \bit
 110         beq     \reg1, r0, \label
 111 .endm
 112
 113 /*
 114  * Tests the bit in reg2 and branches to label if the
 115  * bit is non-zero.  The result of the bit test is stored in reg1.
 116  *
 117  * It is safe to use the same register for reg1 & reg2.
 118  */
 119
 120 .macro BTBNZ    reg1, reg2, bit, label
 121         BT      \reg1, \reg2, \bit
 122         bne     \reg1, r0, \label
 123 .endm
 124
 125 /*
 126  * Tests the bit in reg2 and then compliments the bit in reg2.
 127  * The result of the bit test is stored in reg1.
 128  *
 129  * It is NOT safe to use the same register for reg1 & reg2.
 130  */
 131
 132 .macro BTC      reg1, reg2, bit
 133 .if \bit > 31
 134         .err
 135 .else
 136         .if \bit < 16
 137                 andi    \reg1, \reg2, (1 << \bit)
 138                 xori    \reg2, \reg2, (1 << \bit)
 139         .else
 140                 andhi   \reg1, \reg2, (1 << (\bit - 16))
 141                 xorhi   \reg2, \reg2, (1 << (\bit - 16))
 142         .endif
 143 .endif
 144 .endm
 145
 146 /*
 147  * Tests the bit in reg2 and then sets the bit in reg2.
 148  * The result of the bit test is stored in reg1.
 149  *
 150  * It is NOT safe to use the same register for reg1 & reg2.
 151  */
 152
 153 .macro BTS      reg1, reg2, bit
 154 .if \bit > 31
 155         .err
 156 .else
 157         .if \bit < 16
 158                 andi    \reg1, \reg2, (1 << \bit)
 159                 ori     \reg2, \reg2, (1 << \bit)
 160         .else
 161                 andhi   \reg1, \reg2, (1 << (\bit - 16))
 162                 orhi    \reg2, \reg2, (1 << (\bit - 16))
 163         .endif
 164 .endif
 165 .endm
 166
 167 /*
 168  * Tests the bit in reg2 and then resets the bit in reg2.
 169  * The result of the bit test is stored in reg1.
 170  *
 171  * It is NOT safe to use the same register for reg1 & reg2.
 172  */
 173
 174 .macro BTR      reg1, reg2, bit
 175 .if \bit > 31
 176         .err
 177 .else
 178         .if \bit < 16
 179                 andi    \reg1, \reg2, (1 << \bit)
 180                 andi    \reg2, \reg2, %lo(~(1 << \bit))
 181         .else
 182                 andhi   \reg1, \reg2, (1 << (\bit - 16))
 183                 andhi   \reg2, \reg2, %lo(~(1 << (\bit - 16)))
 184         .endif
 185 .endif
 186 .endm
 187
 188 /*
 189  * Tests the bit in reg2 and then compliments the bit in reg2.
 190  * The result of the bit test is stored in reg1.  If the
 191  * original bit was zero it branches to label.
 192  *
 193  * It is NOT safe to use the same register for reg1 & reg2.
 194  */
 195
 196 .macro BTCBZ    reg1, reg2, bit, label
 197         BTC     \reg1, \reg2, \bit
 198         beq     \reg1, r0, \label
 199 .endm
 200
 201 /*
 202  * Tests the bit in reg2 and then compliments the bit in reg2.
 203  * The result of the bit test is stored in reg1.  If the
 204  * original bit was non-zero it branches to label.
 205  *
 206  * It is NOT safe to use the same register for reg1 & reg2.
 207  */
 208
 209 .macro BTCBNZ   reg1, reg2, bit, label
 210         BTC     \reg1, \reg2, \bit
 211         bne     \reg1, r0, \label
 212 .endm
 213
 214 /*
 215  * Tests the bit in reg2 and then sets the bit in reg2.
 216  * The result of the bit test is stored in reg1.  If the
 217  * original bit was zero it branches to label.
 218  *
 219  * It is NOT safe to use the same register for reg1 & reg2.
 220  */
 221
 222 .macro BTSBZ    reg1, reg2, bit, label
 223         BTS     \reg1, \reg2, \bit
 224         beq     \reg1, r0, \label
 225 .endm
 226
 227 /*
 228  * Tests the bit in reg2 and then sets the bit in reg2.
 229  * The result of the bit test is stored in reg1.  If the
 230  * original bit was non-zero it branches to label.
 231  *
 232  * It is NOT safe to use the same register for reg1 & reg2.
 233  */
 234
 235 .macro BTSBNZ   reg1, reg2, bit, label
 236         BTS     \reg1, \reg2, \bit
 237         bne     \reg1, r0, \label
 238 .endm
 239
 240 /*
 241  * Tests the bit in reg2 and then resets the bit in reg2.
 242  * The result of the bit test is stored in reg1.  If the
 243  * original bit was zero it branches to label.
 244  *
 245  * It is NOT safe to use the same register for reg1 & reg2.
 246  */
 247
 248 .macro BTRBZ    reg1, reg2, bit, label
 249         BTR     \reg1, \reg2, \bit
 250         bne     \reg1, r0, \label
 251 .endm
 252
 253 /*
 254  * Tests the bit in reg2 and then resets the bit in reg2.
 255  * The result of the bit test is stored in reg1.  If the
 256  * original bit was non-zero it branches to label.
 257  *
 258  * It is NOT safe to use the same register for reg1 & reg2.
 259  */
 260
 261 .macro BTRBNZ   reg1, reg2, bit, label
 262         BTR     \reg1, \reg2, \bit
 263         bne     \reg1, r0, \label
 264 .endm
 265
 266 /*
 267  * Tests the bits in mask against reg2 stores the result in reg1.
 268  * If the all the bits in the mask are zero it branches to label.
 269  *
 270  * It is safe to use the same register for reg1 & reg2.
 271  */
 272
 273 .macro TSTBZ    reg1, reg2, mask, label
 274         ANDI32  \reg1, \reg2, \mask
 275         beq     \reg1, r0, \label
 276 .endm
 277
 278 /*
 279  * Tests the bits in mask against reg2 stores the result in reg1.
 280  * If the any of the bits in the mask are 1 it branches to label.
 281  *
 282  * It is safe to use the same register for reg1 & reg2.
 283  */
 284
 285 .macro TSTBNZ   reg1, reg2, mask, label
 286         ANDI32  \reg1, \reg2, \mask
 287         bne     \reg1, r0, \label
 288 .endm
 289
 290 /*
 291  * Pushes reg onto the stack.
 292  */
 293
 294 .macro PUSH     reg
 295         addi    sp, sp, -4
 296         stw     \reg, 0(sp)
 297 .endm
 298
 299 /*
 300  * Pops the top of the stack into reg.
 301  */
 302
 303 .macro POP      reg
 304         ldw     \reg, 0(sp)
 305         addi    sp, sp, 4
 306 .endm
 307
 308
 309 #endif /* _ASM_NIOS2_ASMMACROS_H */