sysdeps/mips/sys/asm.h

   1 /* Copyright (C) 1997, 1998, 2002, 2003, 2004, 2005
   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifndef _SYS_ASM_H
  22 #define _SYS_ASM_H
  23
  24 #include <sgidefs.h>
  25
  26 #ifndef CAT
  27 # ifdef __STDC__
  28 #  define __CAT(str1,str2) str1##str2
  29 # else
  30 #  define __CAT(str1,str2) str1/**/str2
  31 # endif
  32 # define CAT(str1,str2) __CAT(str1,str2)
  33 #endif
  34
  35 /*
  36  * Macros to handle different pointer/register sizes for 32/64-bit code
  37  *
  38  * 64 bit address space isn't used yet, so we may use the R3000 32 bit
  39  * defines for now.
  40  */
  41 #if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
  42 # define PTR .word
  43 # define PTRSIZE 4
  44 # define PTRLOG 2
  45 #elif _MIPS_SIM == _ABI64
  46 # define PTR .dword
  47 # define PTRSIZE 8
  48 # define PTRLOG 3
  49 #endif
  50
  51 /*
  52  * PIC specific declarations
  53  */
  54 #if _MIPS_SIM == _ABIO32
  55 # ifdef __PIC__
  56 #  define CPRESTORE(register) \
  57                 .cprestore register
  58 #  define CPLOAD(register) \
  59                 .cpload register
  60 # else
  61 #  define CPRESTORE(register)
  62 #  define CPLOAD(register)
  63 # endif
  64
  65 # define CPADD(register) \
  66                 .cpadd  register
  67
  68 /*
  69  * Set gp when at 1st instruction
  70  */
  71 # define SETUP_GP                                       \
  72                 .set noreorder;                         \
  73                 .cpload $25;                            \
  74                 .set reorder
  75 /* Set gp when not at 1st instruction */
  76 # define SETUP_GPX(r)                                   \
  77                 .set noreorder;                         \
  78                 move r, $31;     /* Save old ra.  */    \
  79                 bal 10f; /* Find addr of cpload.  */    \
  80                 nop;                                    \
  81 10:                                                     \
  82                 .cpload $31;                            \
  83                 move $31, r;                            \
  84                 .set reorder
  85 # define SETUP_GPX_L(r, l)                              \
  86                 .set noreorder;                         \
  87                 move r, $31;     /* Save old ra.  */    \
  88                 bal l;   /* Find addr of cpload.  */    \
  89                 nop;                                    \
  90 l:                                                      \
  91                 .cpload $31;                            \
  92                 move $31, r;                            \
  93                 .set reorder
  94 # define SAVE_GP(x) \
  95                 .cprestore x /* Save gp trigger t9/jalr conversion.      */
  96 # define SETUP_GP64(a, b)
  97 # define SETUP_GPX64(a, b)
  98 # define SETUP_GPX64_L(cp_reg, ra_save, l)
  99 # define RESTORE_GP64
 100 # define USE_ALT_CP(a)
 101 #else /* _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32 */
 102 /*
 103  * For callee-saved gp calling convention:
 104  */
 105 # define SETUP_GP
 106 # define SETUP_GPX(r)
 107 # define SETUP_GPX_L(r, l)
 108 # define SAVE_GP(x)
 109
 110 # define SETUP_GP64(gpoffset, proc) \
 111                 .cpsetup $25, gpoffset, proc
 112 # define SETUP_GPX64(cp_reg, ra_save)                   \
 113                 move ra_save, $31; /* Save old ra.  */  \
 114                 .set noreorder;                         \
 115                 bal 10f; /* Find addr of .cpsetup.  */  \
 116                 nop;                                    \
 117 10:                                                     \
 118                 .set reorder;                           \
 119                 .cpsetup $31, cp_reg, 10b;              \
 120                 move $31, ra_save
 121 # define SETUP_GPX64_L(cp_reg, ra_save, l)  \
 122                 move ra_save, $31; /* Save old ra.  */  \
 123                 .set noreorder;                         \
 124                 bal l;   /* Find addr of .cpsetup.  */  \
 125                 nop;                                    \
 126 l:                                                      \
 127                 .set reorder;                           \
 128                 .cpsetup $31, cp_reg, l;                \
 129                 move $31, ra_save
 130 # define RESTORE_GP64 \
 131                 .cpreturn
 132 /* Use alternate register for context pointer.  */
 133 # define USE_ALT_CP(reg)        \
 134                 .cplocal reg
 135 #endif /* _MIPS_SIM != _ABIO32 */
 136
 137 /*
 138  * Stack Frame Definitions
 139  */
 140 #if _MIPS_SIM == _ABIO32
 141 # define NARGSAVE 4 /* Space for 4 argument registers must be allocated.  */
 142 #endif
 143 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 144 # define NARGSAVE 0 /* No caller responsibilities.  */
 145 #endif
 146
 147
 148 /*
 149  * LEAF - declare leaf routine
 150  */
 151 #define LEAF(symbol)                                    \
 152                 .globl  symbol;                         \
 153                 .align  2;                              \
 154                 .type   symbol,@function;               \
 155                 .ent    symbol,0;                       \
 156 symbol:         .frame  sp,0,ra
 157
 158 /*
 159  * NESTED - declare nested routine entry point
 160  */
 161 #define NESTED(symbol, framesize, rpc)                  \
 162                 .globl  symbol;                         \
 163                 .align  2;                              \
 164                 .type   symbol,@function;               \
 165                 .ent    symbol,0;                       \
 166 symbol:         .frame  sp, framesize, rpc
 167
 168 /*
 169  * END - mark end of function
 170  */
 171 #ifndef END
 172 # define END(function)                                   \
 173                 .end    function;                       \
 174                 .size   function,.-function
 175 #endif
 176
 177 /*
 178  * EXPORT - export definition of symbol
 179  */
 180 #define EXPORT(symbol)                                  \
 181                 .globl  symbol;                         \
 182 symbol:
 183
 184 /*
 185  * ABS - export absolute symbol
 186  */
 187 #define ABS(symbol,value)                               \
 188                 .globl  symbol;                         \
 189 symbol          =       value
 190
 191 #define PANIC(msg)                                      \
 192                 .set    push;                           \
 193                 .set    reorder;                        \
 194                 la      a0,8f;                          \
 195                 jal     panic;                          \
 196 9:              b       9b;                             \
 197                 .set    pop;                            \
 198                 TEXT(msg)
 199
 200 /*
 201  * Print formated string
 202  */
 203 #define PRINT(string)                                   \
 204                 .set    push;                           \
 205                 .set    reorder;                        \
 206                 la      a0,8f;                          \
 207                 jal     printk;                         \
 208                 .set    pop;                            \
 209                 TEXT(string)
 210
 211 #define TEXT(msg)                                       \
 212                 .data;                                  \
 213 8:              .asciiz msg;                            \
 214                 .previous;
 215
 216 /*
 217  * Build text tables
 218  */
 219 #define TTABLE(string)                                  \
 220                 .text;                                  \
 221                 .word   1f;                             \
 222                 .previous;                              \
 223                 .data;                                  \
 224 1:              .asciz  string;                         \
 225                 .previous
 226
 227 /*
 228  * MIPS IV pref instruction.
 229  * Use with .set noreorder only!
 230  *
 231  * MIPS IV implementations are free to treat this as a nop.  The R5000
 232  * is one of them.  So we should have an option not to use this instruction.
 233  */
 234 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 235     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 236 # define PREF(hint,addr)                                 \
 237                 pref    hint,addr
 238 # define PREFX(hint,addr)                                \
 239                 prefx   hint,addr
 240 #else
 241 # define PREF
 242 # define PREFX
 243 #endif
 244
 245 /*
 246  * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
 247  */
 248 #if _MIPS_ISA == _MIPS_ISA_MIPS1
 249 # define MOVN(rd,rs,rt)                                 \
 250                 .set    push;                           \
 251                 .set    reorder;                        \
 252                 beqz    rt,9f;                          \
 253                 move    rd,rs;                          \
 254                 .set    pop;                            \
 255 9:
 256 # define MOVZ(rd,rs,rt)                                 \
 257                 .set    push;                           \
 258                 .set    reorder;                        \
 259                 bnez    rt,9f;                          \
 260                 move    rd,rt;                          \
 261                 .set    pop;                            \
 262 9:
 263 #endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
 264 #if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
 265 # define MOVN(rd,rs,rt)                                 \
 266                 .set    push;                           \
 267                 .set    noreorder;                      \
 268                 bnezl   rt,9f;                          \
 269                 move    rd,rs;                          \
 270                 .set    pop;                            \
 271 9:
 272 # define MOVZ(rd,rs,rt)                                 \
 273                 .set    push;                           \
 274                 .set    noreorder;                      \
 275                 beqzl   rt,9f;                          \
 276                 movz    rd,rs;                          \
 277                 .set    pop;                            \
 278 9:
 279 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
 280 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 281     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 282 # define MOVN(rd,rs,rt)                                 \
 283                 movn    rd,rs,rt
 284 # define MOVZ(rd,rs,rt)                                 \
 285                 movz    rd,rs,rt
 286 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) */
 287
 288 /*
 289  * Stack alignment
 290  */
 291 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 292 # define ALSZ   15
 293 # define ALMASK ~15
 294 #else
 295 # define ALSZ   7
 296 # define ALMASK ~7
 297 #endif
 298
 299 /*
 300  * Size of a register
 301  */
 302 #if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
 303 # define SZREG  8
 304 #else
 305 # define SZREG  4
 306 #endif
 307
 308 /*
 309  * Use the following macros in assemblercode to load/store registers,
 310  * pointers etc.
 311  */
 312 #if (SZREG == 4)
 313 # define REG_S sw
 314 # define REG_L lw
 315 #else
 316 # define REG_S sd
 317 # define REG_L ld
 318 #endif
 319
 320 /*
 321  * How to add/sub/load/store/shift C int variables.
 322  */
 323 #if (_MIPS_SZINT == 32)
 324 # define INT_ADD        add
 325 # define INT_ADDI       addi
 326 # define INT_ADDU       addu
 327 # define INT_ADDIU      addiu
 328 # define INT_SUB        add
 329 # define INT_SUBI       subi
 330 # define INT_SUBU       subu
 331 # define INT_SUBIU      subu
 332 # define INT_L          lw
 333 # define INT_S          sw
 334 #endif
 335
 336 #if (_MIPS_SZINT == 64)
 337 # define INT_ADD        dadd
 338 # define INT_ADDI       daddi
 339 # define INT_ADDU       daddu
 340 # define INT_ADDIU      daddiu
 341 # define INT_SUB        dadd
 342 # define INT_SUBI       dsubi
 343 # define INT_SUBU       dsubu
 344 # define INT_SUBIU      dsubu
 345 # define INT_L          ld
 346 # define INT_S          sd
 347 #endif
 348
 349 /*
 350  * How to add/sub/load/store/shift C long variables.
 351  */
 352 #if (_MIPS_SZLONG == 32)
 353 # define LONG_ADD       add
 354 # define LONG_ADDI      addi
 355 # define LONG_ADDU      addu
 356 # define LONG_ADDIU     addiu
 357 # define LONG_SUB       add
 358 # define LONG_SUBI      subi
 359 # define LONG_SUBU      subu
 360 # define LONG_SUBIU     subu
 361 # define LONG_L         lw
 362 # define LONG_S         sw
 363 # define LONG_SLL       sll
 364 # define LONG_SLLV      sllv
 365 # define LONG_SRL       srl
 366 # define LONG_SRLV      srlv
 367 # define LONG_SRA       sra
 368 # define LONG_SRAV      srav
 369 #endif
 370
 371 #if (_MIPS_SZLONG == 64)
 372 # define LONG_ADD       dadd
 373 # define LONG_ADDI      daddi
 374 # define LONG_ADDU      daddu
 375 # define LONG_ADDIU     daddiu
 376 # define LONG_SUB       dadd
 377 # define LONG_SUBI      dsubi
 378 # define LONG_SUBU      dsubu
 379 # define LONG_SUBIU     dsubu
 380 # define LONG_L         ld
 381 # define LONG_S         sd
 382 # define LONG_SLL       dsll
 383 # define LONG_SLLV      dsllv
 384 # define LONG_SRL       dsrl
 385 # define LONG_SRLV      dsrlv
 386 # define LONG_SRA       dsra
 387 # define LONG_SRAV      dsrav
 388 #endif
 389
 390 /*
 391  * How to add/sub/load/store/shift pointers.
 392  */
 393 #if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 32)
 394 # define PTR_ADD        add
 395 # define PTR_ADDI       addi
 396 # define PTR_ADDU       addu
 397 # define PTR_ADDIU      addiu
 398 # define PTR_SUB        add
 399 # define PTR_SUBI       subi
 400 # define PTR_SUBU       subu
 401 # define PTR_SUBIU      subu
 402 # define PTR_L          lw
 403 # define PTR_LA         la
 404 # define PTR_S          sw
 405 # define PTR_SLL        sll
 406 # define PTR_SLLV       sllv
 407 # define PTR_SRL        srl
 408 # define PTR_SRLV       srlv
 409 # define PTR_SRA        sra
 410 # define PTR_SRAV       srav
 411
 412 # define PTR_SCALESHIFT 2
 413 #endif
 414
 415 #if _MIPS_SIM == _ABIN32
 416 # define PTR_ADD        add
 417 # define PTR_ADDI       addi
 418 # define PTR_ADDU       add /* no u */
 419 # define PTR_ADDIU      addi /* no u */
 420 # define PTR_SUB        add
 421 # define PTR_SUBI       subi
 422 # define PTR_SUBU       sub /* no u */
 423 # define PTR_SUBIU      sub /* no u */
 424 # define PTR_L          lw
 425 # define PTR_LA         la
 426 # define PTR_S          sw
 427 # define PTR_SLL        sll
 428 # define PTR_SLLV       sllv
 429 # define PTR_SRL        srl
 430 # define PTR_SRLV       srlv
 431 # define PTR_SRA        sra
 432 # define PTR_SRAV       srav
 433
 434 # define PTR_SCALESHIFT 2
 435 #endif
 436
 437 #if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 64 /* o64??? */) \
 438     || _MIPS_SIM == _ABI64
 439 # define PTR_ADD        dadd
 440 # define PTR_ADDI       daddi
 441 # define PTR_ADDU       daddu
 442 # define PTR_ADDIU      daddiu
 443 # define PTR_SUB        dadd
 444 # define PTR_SUBI       dsubi
 445 # define PTR_SUBU       dsubu
 446 # define PTR_SUBIU      dsubu
 447 # define PTR_L          ld
 448 # define PTR_LA         dla
 449 # define PTR_S          sd
 450 # define PTR_SLL        dsll
 451 # define PTR_SLLV       dsllv
 452 # define PTR_SRL        dsrl
 453 # define PTR_SRLV       dsrlv
 454 # define PTR_SRA        dsra
 455 # define PTR_SRAV       dsrav
 456
 457 # define PTR_SCALESHIFT 3
 458 #endif
 459
 460 /*
 461  * Some cp0 registers were extended to 64bit for MIPS III.
 462  */
 463 #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
 464     (_MIPS_ISA == _MIPS_ISA_MIPS32)
 465 # define MFC0   mfc0
 466 # define MTC0   mtc0
 467 #endif
 468 #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
 469     (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 470 # define MFC0   dmfc0
 471 # define MTC0   dmtc0
 472 #endif
 473
 474 /* The MIPS archtectures do not have a uniform memory model.  Particular
 475    platforms may provide additional guarantees - for instance, the R4000
 476    LL and SC instructions implicitly perform a SYNC, and the 4K promises
 477    strong ordering.
 478
 479    However, in the absence of those guarantees, we must assume weak ordering
 480    and SYNC explicitly where necessary.
 481
 482    Some obsolete MIPS processors may not support the SYNC instruction.  This
 483    applies to "true" MIPS I processors; most of the processors which compile
 484    using MIPS I implement parts of MIPS II.  */
 485
 486 #ifndef MIPS_SYNC
 487 # define MIPS_SYNC      sync
 488 #endif
 489
 490 #endif /* sys/asm.h */