arch/mips/mm/uasm.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * A small micro-assembler. It is intentionally kept simple, does only
   7  * support a subset of instructions, and does not try to hide pipeline
   8  * effects like branch delay slots.
   9  *
  10  * Copyright (C) 2004, 2005, 2006, 2008  Thiemo Seufer
  11  * Copyright (C) 2005, 2007  Maciej W. Rozycki
  12  * Copyright (C) 2006  Ralf Baechle (ralf@linux-mips.org)
  13  * Copyright (C) 2012, 2013  MIPS Technologies, Inc.  All rights reserved.
  14  */
  15
  16 enum fields {
  17         RS = 0x001,
  18         RT = 0x002,
  19         RD = 0x004,
  20         RE = 0x008,
  21         SIMM = 0x010,
  22         UIMM = 0x020,
  23         BIMM = 0x040,
  24         JIMM = 0x080,
  25         FUNC = 0x100,
  26         SET = 0x200,
  27         SCIMM = 0x400
  28 };
  29
  30 #define OP_MASK         0x3f
  31 #define OP_SH           26
  32 #define RD_MASK         0x1f
  33 #define RD_SH           11
  34 #define RE_MASK         0x1f
  35 #define RE_SH           6
  36 #define IMM_MASK        0xffff
  37 #define IMM_SH          0
  38 #define JIMM_MASK       0x3ffffff
  39 #define JIMM_SH         0
  40 #define FUNC_MASK       0x3f
  41 #define FUNC_SH         0
  42 #define SET_MASK        0x7
  43 #define SET_SH          0
  44
  45 enum opcode {
  46         insn_invalid,
  47         insn_addiu, insn_addu, insn_and, insn_andi, insn_bbit0, insn_bbit1,
  48         insn_beq, insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
  49         insn_bne, insn_cache, insn_daddiu, insn_daddu, insn_dins, insn_dinsm,
  50         insn_dmfc0, insn_dmtc0, insn_drotr, insn_drotr32, insn_dsll,
  51         insn_dsll32, insn_dsra, insn_dsrl, insn_dsrl32, insn_dsubu, insn_eret,
  52         insn_ext, insn_ins, insn_j, insn_jal, insn_jr, insn_ld, insn_ldx,
  53         insn_ll, insn_lld, insn_lui, insn_lw, insn_lwx, insn_mfc0, insn_mtc0,
  54         insn_or, insn_ori, insn_pref, insn_rfe, insn_rotr, insn_sc, insn_scd,
  55         insn_sd, insn_sll, insn_sra, insn_srl, insn_subu, insn_sw,
  56         insn_syscall, insn_tlbp, insn_tlbr, insn_tlbwi, insn_tlbwr, insn_xor,
  57         insn_xori,
  58 };
  59
  60 struct insn {
  61         enum opcode opcode;
  62         u32 match;
  63         enum fields fields;
  64 };
  65
  66 static inline u32 build_rs(u32 arg)
  67 {
  68         WARN(arg & ~RS_MASK, KERN_WARNING "Micro-assembler field overflow\n");
  69
  70         return (arg & RS_MASK) << RS_SH;
  71 }
  72
  73 static inline u32 build_rt(u32 arg)
  74 {
  75         WARN(arg & ~RT_MASK, KERN_WARNING "Micro-assembler field overflow\n");
  76
  77         return (arg & RT_MASK) << RT_SH;
  78 }
  79
  80 static inline u32 build_rd(u32 arg)
  81 {
  82         WARN(arg & ~RD_MASK, KERN_WARNING "Micro-assembler field overflow\n");
  83
  84         return (arg & RD_MASK) << RD_SH;
  85 }
  86
  87 static inline u32 build_re(u32 arg)
  88 {
  89         WARN(arg & ~RE_MASK, KERN_WARNING "Micro-assembler field overflow\n");
  90
  91         return (arg & RE_MASK) << RE_SH;
  92 }
  93
  94 static inline u32 build_simm(s32 arg)
  95 {
  96         WARN(arg > 0x7fff || arg < -0x8000,
  97              KERN_WARNING "Micro-assembler field overflow\n");
  98
  99         return arg & 0xffff;
 100 }
 101
 102 static inline u32 build_uimm(u32 arg)
 103 {
 104         WARN(arg & ~IMM_MASK, KERN_WARNING "Micro-assembler field overflow\n");
 105
 106         return arg & IMM_MASK;
 107 }
 108
 109 static inline u32 build_scimm(u32 arg)
 110 {
 111         WARN(arg & ~SCIMM_MASK,
 112              KERN_WARNING "Micro-assembler field overflow\n");
 113
 114         return (arg & SCIMM_MASK) << SCIMM_SH;
 115 }
 116
 117 static inline u32 build_func(u32 arg)
 118 {
 119         WARN(arg & ~FUNC_MASK, KERN_WARNING "Micro-assembler field overflow\n");
 120
 121         return arg & FUNC_MASK;
 122 }
 123
 124 static inline u32 build_set(u32 arg)
 125 {
 126         WARN(arg & ~SET_MASK, KERN_WARNING "Micro-assembler field overflow\n");
 127
 128         return arg & SET_MASK;
 129 }
 130
 131 static void build_insn(u32 **buf, enum opcode opc, ...);
 132
 133 #define I_u1u2u3(op)                                    \
 134 Ip_u1u2u3(op)                                           \
 135 {                                                       \
 136         build_insn(buf, insn##op, a, b, c);             \
 137 }                                                       \
 138 UASM_EXPORT_SYMBOL(uasm_i##op);
 139
 140 #define I_u2u1u3(op)                                    \
 141 Ip_u2u1u3(op)                                           \
 142 {                                                       \
 143         build_insn(buf, insn##op, b, a, c);             \
 144 }                                                       \
 145 UASM_EXPORT_SYMBOL(uasm_i##op);
 146
 147 #define I_u3u1u2(op)                                    \
 148 Ip_u3u1u2(op)                                           \
 149 {                                                       \
 150         build_insn(buf, insn##op, b, c, a);             \
 151 }                                                       \
 152 UASM_EXPORT_SYMBOL(uasm_i##op);
 153
 154 #define I_u1u2s3(op)                                    \
 155 Ip_u1u2s3(op)                                           \
 156 {                                                       \
 157         build_insn(buf, insn##op, a, b, c);             \
 158 }                                                       \
 159 UASM_EXPORT_SYMBOL(uasm_i##op);
 160
 161 #define I_u2s3u1(op)                                    \
 162 Ip_u2s3u1(op)                                           \
 163 {                                                       \
 164         build_insn(buf, insn##op, c, a, b);             \
 165 }                                                       \
 166 UASM_EXPORT_SYMBOL(uasm_i##op);
 167
 168 #define I_u2u1s3(op)                                    \
 169 Ip_u2u1s3(op)                                           \
 170 {                                                       \
 171         build_insn(buf, insn##op, b, a, c);             \
 172 }                                                       \
 173 UASM_EXPORT_SYMBOL(uasm_i##op);
 174
 175 #define I_u2u1msbu3(op)                                 \
 176 Ip_u2u1msbu3(op)                                        \
 177 {                                                       \
 178         build_insn(buf, insn##op, b, a, c+d-1, c);      \
 179 }                                                       \
 180 UASM_EXPORT_SYMBOL(uasm_i##op);
 181
 182 #define I_u2u1msb32u3(op)                               \
 183 Ip_u2u1msbu3(op)                                        \
 184 {                                                       \
 185         build_insn(buf, insn##op, b, a, c+d-33, c);     \
 186 }                                                       \
 187 UASM_EXPORT_SYMBOL(uasm_i##op);
 188
 189 #define I_u2u1msbdu3(op)                                \
 190 Ip_u2u1msbu3(op)                                        \
 191 {                                                       \
 192         build_insn(buf, insn##op, b, a, d-1, c);        \
 193 }                                                       \
 194 UASM_EXPORT_SYMBOL(uasm_i##op);
 195
 196 #define I_u1u2(op)                                      \
 197 Ip_u1u2(op)                                             \
 198 {                                                       \
 199         build_insn(buf, insn##op, a, b);                \
 200 }                                                       \
 201 UASM_EXPORT_SYMBOL(uasm_i##op);
 202
 203 #define I_u1s2(op)                                      \
 204 Ip_u1s2(op)                                             \
 205 {                                                       \
 206         build_insn(buf, insn##op, a, b);                \
 207 }                                                       \
 208 UASM_EXPORT_SYMBOL(uasm_i##op);
 209
 210 #define I_u1(op)                                        \
 211 Ip_u1(op)                                               \
 212 {                                                       \
 213         build_insn(buf, insn##op, a);                   \
 214 }                                                       \
 215 UASM_EXPORT_SYMBOL(uasm_i##op);
 216
 217 #define I_0(op)                                         \
 218 Ip_0(op)                                                \
 219 {                                                       \
 220         build_insn(buf, insn##op);                      \
 221 }                                                       \
 222 UASM_EXPORT_SYMBOL(uasm_i##op);
 223
 224 I_u2u1s3(_addiu)
 225 I_u3u1u2(_addu)
 226 I_u2u1u3(_andi)
 227 I_u3u1u2(_and)
 228 I_u1u2s3(_beq)
 229 I_u1u2s3(_beql)
 230 I_u1s2(_bgez)
 231 I_u1s2(_bgezl)
 232 I_u1s2(_bltz)
 233 I_u1s2(_bltzl)
 234 I_u1u2s3(_bne)
 235 I_u2s3u1(_cache)
 236 I_u1u2u3(_dmfc0)
 237 I_u1u2u3(_dmtc0)
 238 I_u2u1s3(_daddiu)
 239 I_u3u1u2(_daddu)
 240 I_u2u1u3(_dsll)
 241 I_u2u1u3(_dsll32)
 242 I_u2u1u3(_dsra)
 243 I_u2u1u3(_dsrl)
 244 I_u2u1u3(_dsrl32)
 245 I_u2u1u3(_drotr)
 246 I_u2u1u3(_drotr32)
 247 I_u3u1u2(_dsubu)
 248 I_0(_eret)
 249 I_u2u1msbdu3(_ext)
 250 I_u2u1msbu3(_ins)
 251 I_u1(_j)
 252 I_u1(_jal)
 253 I_u1(_jr)
 254 I_u2s3u1(_ld)
 255 I_u2s3u1(_ll)
 256 I_u2s3u1(_lld)
 257 I_u1s2(_lui)
 258 I_u2s3u1(_lw)
 259 I_u1u2u3(_mfc0)
 260 I_u1u2u3(_mtc0)
 261 I_u2u1u3(_ori)
 262 I_u3u1u2(_or)
 263 I_0(_rfe)
 264 I_u2s3u1(_sc)
 265 I_u2s3u1(_scd)
 266 I_u2s3u1(_sd)
 267 I_u2u1u3(_sll)
 268 I_u2u1u3(_sra)
 269 I_u2u1u3(_srl)
 270 I_u2u1u3(_rotr)
 271 I_u3u1u2(_subu)
 272 I_u2s3u1(_sw)
 273 I_0(_tlbp)
 274 I_0(_tlbr)
 275 I_0(_tlbwi)
 276 I_0(_tlbwr)
 277 I_u3u1u2(_xor)
 278 I_u2u1u3(_xori)
 279 I_u2u1msbu3(_dins);
 280 I_u2u1msb32u3(_dinsm);
 281 I_u1(_syscall);
 282 I_u1u2s3(_bbit0);
 283 I_u1u2s3(_bbit1);
 284 I_u3u1u2(_lwx)
 285 I_u3u1u2(_ldx)
 286
 287 #ifdef CONFIG_CPU_CAVIUM_OCTEON
 288 #include <asm/octeon/octeon.h>
 289 void ISAFUNC(uasm_i_pref)(u32 **buf, unsigned int a, signed int b,
 290                             unsigned int c)
 291 {
 292         if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) && a <= 24 && a != 5)
 293                 /*
 294                  * As per erratum Core-14449, replace prefetches 0-4,
 295                  * 6-24 with 'pref 28'.
 296                  */
 297                 build_insn(buf, insn_pref, c, 28, b);
 298         else
 299                 build_insn(buf, insn_pref, c, a, b);
 300 }
 301 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_i_pref));
 302 #else
 303 I_u2s3u1(_pref)
 304 #endif
 305
 306 /* Handle labels. */
 307 void ISAFUNC(uasm_build_label)(struct uasm_label **lab, u32 *addr, int lid)
 308 {
 309         (*lab)->addr = addr;
 310         (*lab)->lab = lid;
 311         (*lab)++;
 312 }
 313 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_build_label));
 314
 315 int ISAFUNC(uasm_in_compat_space_p)(long addr)
 316 {
 317         /* Is this address in 32bit compat space? */
 318 #ifdef CONFIG_64BIT
 319         return (((addr) & 0xffffffff00000000L) == 0xffffffff00000000L);
 320 #else
 321         return 1;
 322 #endif
 323 }
 324 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_in_compat_space_p));
 325
 326 static int uasm_rel_highest(long val)
 327 {
 328 #ifdef CONFIG_64BIT
 329         return ((((val + 0x800080008000L) >> 48) & 0xffff) ^ 0x8000) - 0x8000;
 330 #else
 331         return 0;
 332 #endif
 333 }
 334
 335 static int uasm_rel_higher(long val)
 336 {
 337 #ifdef CONFIG_64BIT
 338         return ((((val + 0x80008000L) >> 32) & 0xffff) ^ 0x8000) - 0x8000;
 339 #else
 340         return 0;
 341 #endif
 342 }
 343
 344 int ISAFUNC(uasm_rel_hi)(long val)
 345 {
 346         return ((((val + 0x8000L) >> 16) & 0xffff) ^ 0x8000) - 0x8000;
 347 }
 348 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_rel_hi));
 349
 350 int ISAFUNC(uasm_rel_lo)(long val)
 351 {
 352         return ((val & 0xffff) ^ 0x8000) - 0x8000;
 353 }
 354 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_rel_lo));
 355
 356 void ISAFUNC(UASM_i_LA_mostly)(u32 **buf, unsigned int rs, long addr)
 357 {
 358         if (!ISAFUNC(uasm_in_compat_space_p)(addr)) {
 359                 ISAFUNC(uasm_i_lui)(buf, rs, uasm_rel_highest(addr));
 360                 if (uasm_rel_higher(addr))
 361                         ISAFUNC(uasm_i_daddiu)(buf, rs, rs, uasm_rel_higher(addr));
 362                 if (ISAFUNC(uasm_rel_hi(addr))) {
 363                         ISAFUNC(uasm_i_dsll)(buf, rs, rs, 16);
 364                         ISAFUNC(uasm_i_daddiu)(buf, rs, rs,
 365                                         ISAFUNC(uasm_rel_hi)(addr));
 366                         ISAFUNC(uasm_i_dsll)(buf, rs, rs, 16);
 367                 } else
 368                         ISAFUNC(uasm_i_dsll32)(buf, rs, rs, 0);
 369         } else
 370                 ISAFUNC(uasm_i_lui)(buf, rs, ISAFUNC(uasm_rel_hi(addr)));
 371 }
 372 UASM_EXPORT_SYMBOL(ISAFUNC(UASM_i_LA_mostly));
 373
 374 void ISAFUNC(UASM_i_LA)(u32 **buf, unsigned int rs, long addr)
 375 {
 376         ISAFUNC(UASM_i_LA_mostly)(buf, rs, addr);
 377         if (ISAFUNC(uasm_rel_lo(addr))) {
 378                 if (!ISAFUNC(uasm_in_compat_space_p)(addr))
 379                         ISAFUNC(uasm_i_daddiu)(buf, rs, rs,
 380                                         ISAFUNC(uasm_rel_lo(addr)));
 381                 else
 382                         ISAFUNC(uasm_i_addiu)(buf, rs, rs,
 383                                         ISAFUNC(uasm_rel_lo(addr)));
 384         }
 385 }
 386 UASM_EXPORT_SYMBOL(ISAFUNC(UASM_i_LA));
 387
 388 /* Handle relocations. */
 389 void ISAFUNC(uasm_r_mips_pc16)(struct uasm_reloc **rel, u32 *addr, int lid)
 390 {
 391         (*rel)->addr = addr;
 392         (*rel)->type = R_MIPS_PC16;
 393         (*rel)->lab = lid;
 394         (*rel)++;
 395 }
 396 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_r_mips_pc16));
 397
 398 static inline void __resolve_relocs(struct uasm_reloc *rel,
 399                                     struct uasm_label *lab);
 400
 401 void ISAFUNC(uasm_resolve_relocs)(struct uasm_reloc *rel,
 402                                   struct uasm_label *lab)
 403 {
 404         struct uasm_label *l;
 405
 406         for (; rel->lab != UASM_LABEL_INVALID; rel++)
 407                 for (l = lab; l->lab != UASM_LABEL_INVALID; l++)
 408                         if (rel->lab == l->lab)
 409                                 __resolve_relocs(rel, l);
 410 }
 411 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_resolve_relocs));
 412
 413 void ISAFUNC(uasm_move_relocs)(struct uasm_reloc *rel, u32 *first, u32 *end,
 414                                long off)
 415 {
 416         for (; rel->lab != UASM_LABEL_INVALID; rel++)
 417                 if (rel->addr >= first && rel->addr < end)
 418                         rel->addr += off;
 419 }
 420 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_move_relocs));
 421
 422 void ISAFUNC(uasm_move_labels)(struct uasm_label *lab, u32 *first, u32 *end,
 423                                long off)
 424 {
 425         for (; lab->lab != UASM_LABEL_INVALID; lab++)
 426                 if (lab->addr >= first && lab->addr < end)
 427                         lab->addr += off;
 428 }
 429 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_move_labels));
 430
 431 void ISAFUNC(uasm_copy_handler)(struct uasm_reloc *rel, struct uasm_label *lab,
 432                                 u32 *first, u32 *end, u32 *target)
 433 {
 434         long off = (long)(target - first);
 435
 436         memcpy(target, first, (end - first) * sizeof(u32));
 437
 438         ISAFUNC(uasm_move_relocs(rel, first, end, off));
 439         ISAFUNC(uasm_move_labels(lab, first, end, off));
 440 }
 441 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_copy_handler));
 442
 443 int ISAFUNC(uasm_insn_has_bdelay)(struct uasm_reloc *rel, u32 *addr)
 444 {
 445         for (; rel->lab != UASM_LABEL_INVALID; rel++) {
 446                 if (rel->addr == addr
 447                     && (rel->type == R_MIPS_PC16
 448                         || rel->type == R_MIPS_26))
 449                         return 1;
 450         }
 451
 452         return 0;
 453 }
 454 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_insn_has_bdelay));
 455
 456 /* Convenience functions for labeled branches. */
 457 void ISAFUNC(uasm_il_bltz)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 458                            int lid)
 459 {
 460         uasm_r_mips_pc16(r, *p, lid);
 461         ISAFUNC(uasm_i_bltz)(p, reg, 0);
 462 }
 463 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bltz));
 464
 465 void ISAFUNC(uasm_il_b)(u32 **p, struct uasm_reloc **r, int lid)
 466 {
 467         uasm_r_mips_pc16(r, *p, lid);
 468         ISAFUNC(uasm_i_b)(p, 0);
 469 }
 470 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_b));
 471
 472 void ISAFUNC(uasm_il_beqz)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 473                            int lid)
 474 {
 475         uasm_r_mips_pc16(r, *p, lid);
 476         ISAFUNC(uasm_i_beqz)(p, reg, 0);
 477 }
 478 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_beqz));
 479
 480 void ISAFUNC(uasm_il_beqzl)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 481                             int lid)
 482 {
 483         uasm_r_mips_pc16(r, *p, lid);
 484         ISAFUNC(uasm_i_beqzl)(p, reg, 0);
 485 }
 486 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_beqzl));
 487
 488 void ISAFUNC(uasm_il_bne)(u32 **p, struct uasm_reloc **r, unsigned int reg1,
 489                           unsigned int reg2, int lid)
 490 {
 491         uasm_r_mips_pc16(r, *p, lid);
 492         ISAFUNC(uasm_i_bne)(p, reg1, reg2, 0);
 493 }
 494 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bne));
 495
 496 void ISAFUNC(uasm_il_bnez)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 497                            int lid)
 498 {
 499         uasm_r_mips_pc16(r, *p, lid);
 500         ISAFUNC(uasm_i_bnez)(p, reg, 0);
 501 }
 502 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bnez));
 503
 504 void ISAFUNC(uasm_il_bgezl)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 505                             int lid)
 506 {
 507         uasm_r_mips_pc16(r, *p, lid);
 508         ISAFUNC(uasm_i_bgezl)(p, reg, 0);
 509 }
 510 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bgezl));
 511
 512 void ISAFUNC(uasm_il_bgez)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 513                            int lid)
 514 {
 515         uasm_r_mips_pc16(r, *p, lid);
 516         ISAFUNC(uasm_i_bgez)(p, reg, 0);
 517 }
 518 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bgez));
 519
 520 void ISAFUNC(uasm_il_bbit0)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 521                             unsigned int bit, int lid)
 522 {
 523         uasm_r_mips_pc16(r, *p, lid);
 524         ISAFUNC(uasm_i_bbit0)(p, reg, bit, 0);
 525 }
 526 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bbit0));
 527
 528 void ISAFUNC(uasm_il_bbit1)(u32 **p, struct uasm_reloc **r, unsigned int reg,
 529                             unsigned int bit, int lid)
 530 {
 531         uasm_r_mips_pc16(r, *p, lid);
 532         ISAFUNC(uasm_i_bbit1)(p, reg, bit, 0);
 533 }
 534 UASM_EXPORT_SYMBOL(ISAFUNC(uasm_il_bbit1));