sysdeps/mips/sys/asm.h

   1 /* Copyright (C) 1997, 1998, 2002, 2003, 2004, 2005, 2012
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ralf Baechle <ralf@gnu.org>.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _SYS_ASM_H
  21 #define _SYS_ASM_H
  22
  23 #include <sgidefs.h>
  24
  25 #ifndef CAT
  26 # define __CAT(str1,str2) str1##str2
  27 # define CAT(str1,str2) __CAT(str1,str2)
  28 #endif
  29
  30 /*
  31  * Macros to handle different pointer/register sizes for 32/64-bit code
  32  *
  33  * 64 bit address space isn't used yet, so we may use the R3000 32 bit
  34  * defines for now.
  35  */
  36 #if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
  37 # define PTR .word
  38 # define PTRSIZE 4
  39 # define PTRLOG 2
  40 #elif _MIPS_SIM == _ABI64
  41 # define PTR .dword
  42 # define PTRSIZE 8
  43 # define PTRLOG 3
  44 #endif
  45
  46 /*
  47  * PIC specific declarations
  48  */
  49 #if _MIPS_SIM == _ABIO32
  50 # ifdef __PIC__
  51 #  define CPRESTORE(register) \
  52                 .cprestore register
  53 #  define CPLOAD(register) \
  54                 .cpload register
  55 # else
  56 #  define CPRESTORE(register)
  57 #  define CPLOAD(register)
  58 # endif
  59
  60 # define CPADD(register) \
  61                 .cpadd  register
  62
  63 /*
  64  * Set gp when at 1st instruction
  65  */
  66 # define SETUP_GP                                       \
  67                 .set noreorder;                         \
  68                 .cpload $25;                            \
  69                 .set reorder
  70 /* Set gp when not at 1st instruction */
  71 # define SETUP_GPX(r)                                   \
  72                 .set noreorder;                         \
  73                 move r, $31;     /* Save old ra.  */    \
  74                 bal 10f; /* Find addr of cpload.  */    \
  75                 nop;                                    \
  76 10:                                                     \
  77                 .cpload $31;                            \
  78                 move $31, r;                            \
  79                 .set reorder
  80 # define SETUP_GPX_L(r, l)                              \
  81                 .set noreorder;                         \
  82                 move r, $31;     /* Save old ra.  */    \
  83                 bal l;   /* Find addr of cpload.  */    \
  84                 nop;                                    \
  85 l:                                                      \
  86                 .cpload $31;                            \
  87                 move $31, r;                            \
  88                 .set reorder
  89 # define SAVE_GP(x) \
  90                 .cprestore x /* Save gp trigger t9/jalr conversion.      */
  91 # define SETUP_GP64(a, b)
  92 # define SETUP_GPX64(a, b)
  93 # define SETUP_GPX64_L(cp_reg, ra_save, l)
  94 # define RESTORE_GP64
  95 # define USE_ALT_CP(a)
  96 #else /* _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32 */
  97 /*
  98  * For callee-saved gp calling convention:
  99  */
 100 # define SETUP_GP
 101 # define SETUP_GPX(r)
 102 # define SETUP_GPX_L(r, l)
 103 # define SAVE_GP(x)
 104
 105 # define SETUP_GP64(gpoffset, proc) \
 106                 .cpsetup $25, gpoffset, proc
 107 # define SETUP_GPX64(cp_reg, ra_save)                   \
 108                 move ra_save, $31; /* Save old ra.  */  \
 109                 .set noreorder;                         \
 110                 bal 10f; /* Find addr of .cpsetup.  */  \
 111                 nop;                                    \
 112 10:                                                     \
 113                 .set reorder;                           \
 114                 .cpsetup $31, cp_reg, 10b;              \
 115                 move $31, ra_save
 116 # define SETUP_GPX64_L(cp_reg, ra_save, l)  \
 117                 move ra_save, $31; /* Save old ra.  */  \
 118                 .set noreorder;                         \
 119                 bal l;   /* Find addr of .cpsetup.  */  \
 120                 nop;                                    \
 121 l:                                                      \
 122                 .set reorder;                           \
 123                 .cpsetup $31, cp_reg, l;                \
 124                 move $31, ra_save
 125 # define RESTORE_GP64 \
 126                 .cpreturn
 127 /* Use alternate register for context pointer.  */
 128 # define USE_ALT_CP(reg)        \
 129                 .cplocal reg
 130 #endif /* _MIPS_SIM != _ABIO32 */
 131
 132 /*
 133  * Stack Frame Definitions
 134  */
 135 #if _MIPS_SIM == _ABIO32
 136 # define NARGSAVE 4 /* Space for 4 argument registers must be allocated.  */
 137 #endif
 138 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 139 # define NARGSAVE 0 /* No caller responsibilities.  */
 140 #endif
 141
 142
 143 /*
 144  * LEAF - declare leaf routine
 145  */
 146 #define LEAF(symbol)                                    \
 147                 .globl  symbol;                         \
 148                 .align  2;                              \
 149                 .type   symbol,@function;               \
 150                 .ent    symbol,0;                       \
 151 symbol:         .frame  sp,0,ra
 152
 153 /*
 154  * NESTED - declare nested routine entry point
 155  */
 156 #define NESTED(symbol, framesize, rpc)                  \
 157                 .globl  symbol;                         \
 158                 .align  2;                              \
 159                 .type   symbol,@function;               \
 160                 .ent    symbol,0;                       \
 161 symbol:         .frame  sp, framesize, rpc
 162
 163 /*
 164  * END - mark end of function
 165  */
 166 #ifndef END
 167 # define END(function)                                   \
 168                 .end    function;                       \
 169                 .size   function,.-function
 170 #endif
 171
 172 /*
 173  * EXPORT - export definition of symbol
 174  */
 175 #define EXPORT(symbol)                                  \
 176                 .globl  symbol;                         \
 177 symbol:
 178
 179 /*
 180  * ABS - export absolute symbol
 181  */
 182 #define ABS(symbol,value)                               \
 183                 .globl  symbol;                         \
 184 symbol          =       value
 185
 186 #define PANIC(msg)                                      \
 187                 .set    push;                           \
 188                 .set    reorder;                        \
 189                 la      a0,8f;                          \
 190                 jal     panic;                          \
 191 9:              b       9b;                             \
 192                 .set    pop;                            \
 193                 TEXT(msg)
 194
 195 /*
 196  * Print formated string
 197  */
 198 #define PRINT(string)                                   \
 199                 .set    push;                           \
 200                 .set    reorder;                        \
 201                 la      a0,8f;                          \
 202                 jal     printk;                         \
 203                 .set    pop;                            \
 204                 TEXT(string)
 205
 206 #define TEXT(msg)                                       \
 207                 .data;                                  \
 208 8:              .asciiz msg;                            \
 209                 .previous;
 210
 211 /*
 212  * Build text tables
 213  */
 214 #define TTABLE(string)                                  \
 215                 .text;                                  \
 216                 .word   1f;                             \
 217                 .previous;                              \
 218                 .data;                                  \
 219 1:              .asciz  string;                         \
 220                 .previous
 221
 222 /*
 223  * MIPS IV pref instruction.
 224  * Use with .set noreorder only!
 225  *
 226  * MIPS IV implementations are free to treat this as a nop.  The R5000
 227  * is one of them.  So we should have an option not to use this instruction.
 228  */
 229 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 230     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 231 # define PREF(hint,addr)                                 \
 232                 pref    hint,addr
 233 # define PREFX(hint,addr)                                \
 234                 prefx   hint,addr
 235 #else
 236 # define PREF
 237 # define PREFX
 238 #endif
 239
 240 /*
 241  * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
 242  */
 243 #if _MIPS_ISA == _MIPS_ISA_MIPS1
 244 # define MOVN(rd,rs,rt)                                 \
 245                 .set    push;                           \
 246                 .set    reorder;                        \
 247                 beqz    rt,9f;                          \
 248                 move    rd,rs;                          \
 249                 .set    pop;                            \
 250 9:
 251 # define MOVZ(rd,rs,rt)                                 \
 252                 .set    push;                           \
 253                 .set    reorder;                        \
 254                 bnez    rt,9f;                          \
 255                 move    rd,rt;                          \
 256                 .set    pop;                            \
 257 9:
 258 #endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
 259 #if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
 260 # define MOVN(rd,rs,rt)                                 \
 261                 .set    push;                           \
 262                 .set    noreorder;                      \
 263                 bnezl   rt,9f;                          \
 264                 move    rd,rs;                          \
 265                 .set    pop;                            \
 266 9:
 267 # define MOVZ(rd,rs,rt)                                 \
 268                 .set    push;                           \
 269                 .set    noreorder;                      \
 270                 beqzl   rt,9f;                          \
 271                 movz    rd,rs;                          \
 272                 .set    pop;                            \
 273 9:
 274 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
 275 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 276     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 277 # define MOVN(rd,rs,rt)                                 \
 278                 movn    rd,rs,rt
 279 # define MOVZ(rd,rs,rt)                                 \
 280                 movz    rd,rs,rt
 281 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) */
 282
 283 /*
 284  * Stack alignment
 285  */
 286 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 287 # define ALSZ   15
 288 # define ALMASK ~15
 289 #else
 290 # define ALSZ   7
 291 # define ALMASK ~7
 292 #endif
 293
 294 /*
 295  * Size of a register
 296  */
 297 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 298 # define SZREG  8
 299 #else
 300 # define SZREG  4
 301 #endif
 302
 303 /*
 304  * Use the following macros in assemblercode to load/store registers,
 305  * pointers etc.
 306  */
 307 #if (SZREG == 4)
 308 # define REG_S sw
 309 # define REG_L lw
 310 #else
 311 # define REG_S sd
 312 # define REG_L ld
 313 #endif
 314
 315 /*
 316  * How to add/sub/load/store/shift C int variables.
 317  */
 318 #if (_MIPS_SZINT == 32)
 319 # define INT_ADD        add
 320 # define INT_ADDI       addi
 321 # define INT_ADDU       addu
 322 # define INT_ADDIU      addiu
 323 # define INT_SUB        add
 324 # define INT_SUBI       subi
 325 # define INT_SUBU       subu
 326 # define INT_SUBIU      subu
 327 # define INT_L          lw
 328 # define INT_S          sw
 329 #endif
 330
 331 #if (_MIPS_SZINT == 64)
 332 # define INT_ADD        dadd
 333 # define INT_ADDI       daddi
 334 # define INT_ADDU       daddu
 335 # define INT_ADDIU      daddiu
 336 # define INT_SUB        dadd
 337 # define INT_SUBI       dsubi
 338 # define INT_SUBU       dsubu
 339 # define INT_SUBIU      dsubu
 340 # define INT_L          ld
 341 # define INT_S          sd
 342 #endif
 343
 344 /*
 345  * How to add/sub/load/store/shift C long variables.
 346  */
 347 #if (_MIPS_SZLONG == 32)
 348 # define LONG_ADD       add
 349 # define LONG_ADDI      addi
 350 # define LONG_ADDU      addu
 351 # define LONG_ADDIU     addiu
 352 # define LONG_SUB       add
 353 # define LONG_SUBI      subi
 354 # define LONG_SUBU      subu
 355 # define LONG_SUBIU     subu
 356 # define LONG_L         lw
 357 # define LONG_S         sw
 358 # define LONG_SLL       sll
 359 # define LONG_SLLV      sllv
 360 # define LONG_SRL       srl
 361 # define LONG_SRLV      srlv
 362 # define LONG_SRA       sra
 363 # define LONG_SRAV      srav
 364 #endif
 365
 366 #if (_MIPS_SZLONG == 64)
 367 # define LONG_ADD       dadd
 368 # define LONG_ADDI      daddi
 369 # define LONG_ADDU      daddu
 370 # define LONG_ADDIU     daddiu
 371 # define LONG_SUB       dadd
 372 # define LONG_SUBI      dsubi
 373 # define LONG_SUBU      dsubu
 374 # define LONG_SUBIU     dsubu
 375 # define LONG_L         ld
 376 # define LONG_S         sd
 377 # define LONG_SLL       dsll
 378 # define LONG_SLLV      dsllv
 379 # define LONG_SRL       dsrl
 380 # define LONG_SRLV      dsrlv
 381 # define LONG_SRA       dsra
 382 # define LONG_SRAV      dsrav
 383 #endif
 384
 385 /*
 386  * How to add/sub/load/store/shift pointers.
 387  */
 388 #if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 32)
 389 # define PTR_ADD        add
 390 # define PTR_ADDI       addi
 391 # define PTR_ADDU       addu
 392 # define PTR_ADDIU      addiu
 393 # define PTR_SUB        add
 394 # define PTR_SUBI       subi
 395 # define PTR_SUBU       subu
 396 # define PTR_SUBIU      subu
 397 # define PTR_L          lw
 398 # define PTR_LA         la
 399 # define PTR_S          sw
 400 # define PTR_SLL        sll
 401 # define PTR_SLLV       sllv
 402 # define PTR_SRL        srl
 403 # define PTR_SRLV       srlv
 404 # define PTR_SRA        sra
 405 # define PTR_SRAV       srav
 406
 407 # define PTR_SCALESHIFT 2
 408 #endif
 409
 410 #if _MIPS_SIM == _ABIN32
 411 # define PTR_ADD        add
 412 # define PTR_ADDI       addi
 413 # define PTR_ADDU       add /* no u */
 414 # define PTR_ADDIU      addi /* no u */
 415 # define PTR_SUB        add
 416 # define PTR_SUBI       subi
 417 # define PTR_SUBU       sub /* no u */
 418 # define PTR_SUBIU      sub /* no u */
 419 # define PTR_L          lw
 420 # define PTR_LA         la
 421 # define PTR_S          sw
 422 # define PTR_SLL        sll
 423 # define PTR_SLLV       sllv
 424 # define PTR_SRL        srl
 425 # define PTR_SRLV       srlv
 426 # define PTR_SRA        sra
 427 # define PTR_SRAV       srav
 428
 429 # define PTR_SCALESHIFT 2
 430 #endif
 431
 432 #if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 64 /* o64??? */) \
 433     || _MIPS_SIM == _ABI64
 434 # define PTR_ADD        dadd
 435 # define PTR_ADDI       daddi
 436 # define PTR_ADDU       daddu
 437 # define PTR_ADDIU      daddiu
 438 # define PTR_SUB        dadd
 439 # define PTR_SUBI       dsubi
 440 # define PTR_SUBU       dsubu
 441 # define PTR_SUBIU      dsubu
 442 # define PTR_L          ld
 443 # define PTR_LA         dla
 444 # define PTR_S          sd
 445 # define PTR_SLL        dsll
 446 # define PTR_SLLV       dsllv
 447 # define PTR_SRL        dsrl
 448 # define PTR_SRLV       dsrlv
 449 # define PTR_SRA        dsra
 450 # define PTR_SRAV       dsrav
 451
 452 # define PTR_SCALESHIFT 3
 453 #endif
 454
 455 /*
 456  * Some cp0 registers were extended to 64bit for MIPS III.
 457  */
 458 #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
 459     (_MIPS_ISA == _MIPS_ISA_MIPS32)
 460 # define MFC0   mfc0
 461 # define MTC0   mtc0
 462 #endif
 463 #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
 464     (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 465 # define MFC0   dmfc0
 466 # define MTC0   dmtc0
 467 #endif
 468
 469 /* The MIPS archtectures do not have a uniform memory model.  Particular
 470    platforms may provide additional guarantees - for instance, the R4000
 471    LL and SC instructions implicitly perform a SYNC, and the 4K promises
 472    strong ordering.
 473
 474    However, in the absence of those guarantees, we must assume weak ordering
 475    and SYNC explicitly where necessary.
 476
 477    Some obsolete MIPS processors may not support the SYNC instruction.  This
 478    applies to "true" MIPS I processors; most of the processors which compile
 479    using MIPS I implement parts of MIPS II.  */
 480
 481 #ifndef MIPS_SYNC
 482 # define MIPS_SYNC      sync
 483 #endif
 484
 485 #endif /* sys/asm.h */