libc/sysdeps/linux/mips/sys/asm.h

   1 /* Copyright (C) 1997, 1998, 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ralf Baechle <ralf@gnu.org>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #ifndef _SYS_ASM_H
  21 #define _SYS_ASM_H
  22
  23 #include <sgidefs.h>
  24
  25 #ifndef CAT
  26 # ifdef __STDC__
  27 #  define __CAT(str1,str2) str1##str2
  28 # else
  29 #  define __CAT(str1,str2) str1/**/str2
  30 # endif
  31 # define CAT(str1,str2) __CAT(str1,str2)
  32 #endif
  33
  34 /*
  35  * Macros to handle different pointer/register sizes for 32/64-bit code
  36  *
  37  * 64 bit address space isn't used yet, so we may use the R3000 32 bit
  38  * defines for now.
  39  */
  40 #if (_MIPS_SIM == _MIPS_SIM_ABI32) || (_MIPS_SIM == _MIPS_SIM_NABI32)
  41 # define PTR .word
  42 # define PTRSIZE 4
  43 # define PTRLOG 2
  44 #elif (_MIPS_SIM == _MIPS_SIM_ABI64)
  45 # define PTR .dword
  46 # define PTRSIZE 8
  47 # define PTRLOG 3
  48 #endif
  49
  50 /*
  51  * PIC specific declarations
  52  */
  53 #if (_MIPS_SIM == _MIPS_SIM_ABI32)
  54 # ifdef __PIC__
  55 #  define CPRESTORE(register) \
  56                 .cprestore register
  57 #  define CPLOAD(register) \
  58                 .cpload register
  59 # else
  60 #  define CPRESTORE(register)
  61 #  define CPLOAD(register)
  62 # endif
  63
  64 # define CPADD(register) \
  65                 .cpadd  register
  66
  67 /*
  68  * Set gp when at 1st instruction
  69  */
  70 # define SETUP_GP                                       \
  71                 .set noreorder;                         \
  72                 .cpload $25;                            \
  73                 .set reorder
  74 /* Set gp when not at 1st instruction */
  75 # define SETUP_GPX(r)                                   \
  76                 .set noreorder;                         \
  77                 move r, $31;     /* Save old ra.  */    \
  78                 bal 10f; /* Find addr of cpload.  */    \
  79                 nop;                                    \
  80 10:                                                     \
  81                 .cpload $31;                            \
  82                 move $31, r;                            \
  83                 .set reorder
  84 # define SETUP_GPX_L(r, l)                              \
  85                 .set noreorder;                         \
  86                 move r, $31;     /* Save old ra.  */    \
  87                 bal l;   /* Find addr of cpload.  */    \
  88                 nop;                                    \
  89 l:                                                      \
  90                 .cpload $31;                            \
  91                 move $31, r;                            \
  92                 .set reorder
  93 # define SAVE_GP(x) \
  94                 .cprestore x /* Save gp trigger t9/jalr conversion.      */
  95 # define SETUP_GP64(a, b)
  96 # define SETUP_GPX64(a, b)
  97 # define SETUP_GPX64_L(cp_reg, ra_save, l)
  98 # define RESTORE_GP64
  99 # define USE_ALT_CP(a)
 100 # define L(label) $L ## label
 101 #else /* (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32) */
 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 # define L(label) .L ## label
 136 #endif /* _MIPS_SIM != _MIPS_SIM_ABI32 */
 137
 138 /*
 139  * Stack Frame Definitions
 140  */
 141 #if (_MIPS_SIM == _MIPS_SIM_ABI32)
 142 # define NARGSAVE 4 /* Space for 4 argument registers must be allocated.  */
 143 #endif
 144 #if (_MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32)
 145 # define NARGSAVE 0 /* No caller responsibilities.  */
 146 #endif
 147
 148
 149 /*
 150  * LEAF - declare leaf routine
 151  */
 152 #define LEAF(symbol)                                    \
 153                 .globl  symbol;                         \
 154                 .align  2;                              \
 155                 .type   symbol,@function;               \
 156                 .ent    symbol,0;                       \
 157 symbol:         .frame  sp,0,ra
 158
 159 /*
 160  * NESTED - declare nested routine entry point
 161  */
 162 #define NESTED(symbol, framesize, rpc)                  \
 163                 .globl  symbol;                         \
 164                 .align  2;                              \
 165                 .type   symbol,@function;               \
 166                 .ent    symbol,0;                       \
 167 symbol:         .frame  sp, framesize, rpc
 168
 169 /*
 170  * END - mark end of function
 171  */
 172 #ifndef END
 173 # define END(function)                                   \
 174                 .end    function;                       \
 175                 .size   function,.-function
 176 #endif
 177
 178 /*
 179  * EXPORT - export definition of symbol
 180  */
 181 #define EXPORT(symbol)                                  \
 182                 .globl  symbol;                         \
 183 symbol:
 184
 185 /*
 186  * ABS - export absolute symbol
 187  */
 188 #define ABS(symbol,value)                               \
 189                 .globl  symbol;                         \
 190 symbol          =       value
 191
 192 #define PANIC(msg)                                      \
 193                 .set    push;                           \
 194                 .set    reorder;                        \
 195                 la      a0,8f;                          \
 196                 jal     panic;                          \
 197 9:              b       9b;                             \
 198                 .set    pop;                            \
 199                 TEXT(msg)
 200
 201 /*
 202  * Print formated string
 203  */
 204 #define PRINT(string)                                   \
 205                 .set    push;                           \
 206                 .set    reorder;                        \
 207                 la      a0,8f;                          \
 208                 jal     printk;                         \
 209                 .set    pop;                            \
 210                 TEXT(string)
 211
 212 #define TEXT(msg)                                       \
 213                 .data;                                  \
 214 8:              .asciiz msg;                            \
 215                 .previous;
 216
 217 /*
 218  * Build text tables
 219  */
 220 #define TTABLE(string)                                  \
 221                 .text;                                  \
 222                 .word   1f;                             \
 223                 .previous;                              \
 224                 .data;                                  \
 225 1:              .asciz  string;                         \
 226                 .previous
 227
 228 /*
 229  * MIPS IV pref instruction.
 230  * Use with .set noreorder only!
 231  *
 232  * MIPS IV implementations are free to treat this as a nop.  The R5000
 233  * is one of them.  So we should have an option not to use this instruction.
 234  */
 235 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 236     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 237 # define PREF(hint,addr)                                 \
 238                 pref    hint,addr
 239 # define PREFX(hint,addr)                                \
 240                 prefx   hint,addr
 241 #else
 242 # define PREF
 243 # define PREFX
 244 #endif
 245
 246 /*
 247  * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
 248  */
 249 #if _MIPS_ISA == _MIPS_ISA_MIPS1
 250 # define MOVN(rd,rs,rt)                                 \
 251                 .set    push;                           \
 252                 .set    reorder;                        \
 253                 beqz    rt,9f;                          \
 254                 move    rd,rs;                          \
 255                 .set    pop;                            \
 256 9:
 257 # define MOVZ(rd,rs,rt)                                 \
 258                 .set    push;                           \
 259                 .set    reorder;                        \
 260                 bnez    rt,9f;                          \
 261                 move    rd,rt;                          \
 262                 .set    pop;                            \
 263 9:
 264 #endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
 265 #if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
 266 # define MOVN(rd,rs,rt)                                 \
 267                 .set    push;                           \
 268                 .set    noreorder;                      \
 269                 bnezl   rt,9f;                          \
 270                 move    rd,rs;                          \
 271                 .set    pop;                            \
 272 9:
 273 # define MOVZ(rd,rs,rt)                                 \
 274                 .set    push;                           \
 275                 .set    noreorder;                      \
 276                 beqzl   rt,9f;                          \
 277                 movz    rd,rs;                          \
 278                 .set    pop;                            \
 279 9:
 280 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
 281 #if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) || \
 282     (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 283 # define MOVN(rd,rs,rt)                                 \
 284                 movn    rd,rs,rt
 285 # define MOVZ(rd,rs,rt)                                 \
 286                 movz    rd,rs,rt
 287 #endif /* (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) */
 288
 289 /*
 290  * Stack alignment
 291  */
 292 #if (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32)
 293 # define ALSZ   15
 294 # define ALMASK ~15
 295 #else
 296 # define ALSZ   7
 297 # define ALMASK ~7
 298 #endif
 299
 300 /*
 301  * Size of a register
 302  */
 303 #if (_MIPS_SIM == _MIPS_SIM_ABI64) || (_MIPS_SIM == _MIPS_SIM_NABI32)
 304 # define SZREG  8
 305 #else
 306 # define SZREG  4
 307 #endif
 308
 309 /*
 310  * Use the following macros in assemblercode to load/store registers,
 311  * pointers etc.
 312  */
 313 #if (SZREG == 4)
 314 # define REG_S sw
 315 # define REG_L lw
 316 #else
 317 # define REG_S sd
 318 # define REG_L ld
 319 #endif
 320
 321 /*
 322  * How to add/sub/load/store/shift C int variables.
 323  */
 324 #if (_MIPS_SZINT == 32)
 325 # define INT_ADD        add
 326 # define INT_ADDI       addi
 327 # define INT_ADDU       addu
 328 # define INT_ADDIU      addiu
 329 # define INT_SUB        add
 330 # define INT_SUBI       subi
 331 # define INT_SUBU       subu
 332 # define INT_SUBIU      subu
 333 # define INT_L          lw
 334 # define INT_S          sw
 335 #endif
 336
 337 #if (_MIPS_SZINT == 64)
 338 # define INT_ADD        dadd
 339 # define INT_ADDI       daddi
 340 # define INT_ADDU       daddu
 341 # define INT_ADDIU      daddiu
 342 # define INT_SUB        dadd
 343 # define INT_SUBI       dsubi
 344 # define INT_SUBU       dsubu
 345 # define INT_SUBIU      dsubu
 346 # define INT_L          ld
 347 # define INT_S          sd
 348 #endif
 349
 350 /*
 351  * How to add/sub/load/store/shift C long variables.
 352  */
 353 #if (_MIPS_SZLONG == 32)
 354 # define LONG_ADD       add
 355 # define LONG_ADDI      addi
 356 # define LONG_ADDU      addu
 357 # define LONG_ADDIU     addiu
 358 # define LONG_SUB       add
 359 # define LONG_SUBI      subi
 360 # define LONG_SUBU      subu
 361 # define LONG_SUBIU     subu
 362 # define LONG_L         lw
 363 # define LONG_S         sw
 364 # define LONG_SLL       sll
 365 # define LONG_SLLV      sllv
 366 # define LONG_SRL       srl
 367 # define LONG_SRLV      srlv
 368 # define LONG_SRA       sra
 369 # define LONG_SRAV      srav
 370 #endif
 371
 372 #if (_MIPS_SZLONG == 64)
 373 # define LONG_ADD       dadd
 374 # define LONG_ADDI      daddi
 375 # define LONG_ADDU      daddu
 376 # define LONG_ADDIU     daddiu
 377 # define LONG_SUB       dadd
 378 # define LONG_SUBI      dsubi
 379 # define LONG_SUBU      dsubu
 380 # define LONG_SUBIU     dsubu
 381 # define LONG_L         ld
 382 # define LONG_S         sd
 383 # define LONG_SLL       dsll
 384 # define LONG_SLLV      dsllv
 385 # define LONG_SRL       dsrl
 386 # define LONG_SRLV      dsrlv
 387 # define LONG_SRA       dsra
 388 # define LONG_SRAV      dsrav
 389 #endif
 390
 391 /*
 392  * How to add/sub/load/store/shift pointers.
 393  */
 394 #if (_MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32)
 395 # define PTR_ADD        add
 396 # define PTR_ADDI       addi
 397 # define PTR_ADDU       addu
 398 # define PTR_ADDIU      addiu
 399 # define PTR_SUB        add
 400 # define PTR_SUBI       subi
 401 # define PTR_SUBU       subu
 402 # define PTR_SUBIU      subu
 403 # define PTR_L          lw
 404 # define PTR_LA         la
 405 # define PTR_S          sw
 406 # define PTR_SLL        sll
 407 # define PTR_SLLV       sllv
 408 # define PTR_SRL        srl
 409 # define PTR_SRLV       srlv
 410 # define PTR_SRA        sra
 411 # define PTR_SRAV       srav
 412
 413 # define PTR_SCALESHIFT 2
 414 #endif
 415
 416 #if _MIPS_SIM == _MIPS_SIM_NABI32
 417 # define PTR_ADD        add
 418 # define PTR_ADDI       addi
 419 # define PTR_ADDU       add /* no u */
 420 # define PTR_ADDIU      addi /* no u */
 421 # define PTR_SUB        add
 422 # define PTR_SUBI       subi
 423 # define PTR_SUBU       sub /* no u */
 424 # define PTR_SUBIU      sub /* no u */
 425 # define PTR_L          lw
 426 # define PTR_LA         la
 427 # define PTR_S          sw
 428 # define PTR_SLL        sll
 429 # define PTR_SLLV       sllv
 430 # define PTR_SRL        srl
 431 # define PTR_SRLV       srlv
 432 # define PTR_SRA        sra
 433 # define PTR_SRAV       srav
 434
 435 # define PTR_SCALESHIFT 2
 436 #endif
 437
 438 #if (_MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 64 /* o64??? */) \
 439     || _MIPS_SIM == _MIPS_SIM_ABI64
 440 # define PTR_ADD        dadd
 441 # define PTR_ADDI       daddi
 442 # define PTR_ADDU       daddu
 443 # define PTR_ADDIU      daddiu
 444 # define PTR_SUB        dadd
 445 # define PTR_SUBI       dsubi
 446 # define PTR_SUBU       dsubu
 447 # define PTR_SUBIU      dsubu
 448 # define PTR_L          ld
 449 # define PTR_LA         dla
 450 # define PTR_S          sd
 451 # define PTR_SLL        dsll
 452 # define PTR_SLLV       dsllv
 453 # define PTR_SRL        dsrl
 454 # define PTR_SRLV       dsrlv
 455 # define PTR_SRA        dsra
 456 # define PTR_SRAV       dsrav
 457
 458 # define PTR_SCALESHIFT 3
 459 #endif
 460
 461 /*
 462  * Some cp0 registers were extended to 64bit for MIPS III.
 463  */
 464 #if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) || \
 465     (_MIPS_ISA == _MIPS_ISA_MIPS32)
 466 # define MFC0   mfc0
 467 # define MTC0   mtc0
 468 #endif
 469 #if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) || \
 470     (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
 471 # define MFC0   dmfc0
 472 # define MTC0   dmtc0
 473 #endif
 474
 475 #endif /* sys/asm.h */