tcg/loongarch64/tcg-target.c.inc

   1 /*
   2  * Tiny Code Generator for QEMU
   3  *
   4  * Copyright (c) 2021 WANG Xuerui <git@xen0n.name>
   5  *
   6  * Based on tcg/riscv/tcg-target.c.inc
   7  *
   8  * Copyright (c) 2018 SiFive, Inc
   9  * Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>
  10  * Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net>
  11  * Copyright (c) 2008 Fabrice Bellard
  12  *
  13  * Permission is hereby granted, free of charge, to any person obtaining a copy
  14  * of this software and associated documentation files (the "Software"), to deal
  15  * in the Software without restriction, including without limitation the rights
  16  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  17  * copies of the Software, and to permit persons to whom the Software is
  18  * furnished to do so, subject to the following conditions:
  19  *
  20  * The above copyright notice and this permission notice shall be included in
  21  * all copies or substantial portions of the Software.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  26  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  28  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  29  * THE SOFTWARE.
  30  */
  31
  32 #include "../tcg-ldst.c.inc"
  33 #include <asm/hwcap.h>
  34
  35 #ifdef CONFIG_DEBUG_TCG
  36 static const char * const tcg_target_reg_names[TCG_TARGET_NB_REGS] = {
  37     "zero",
  38     "ra",
  39     "tp",
  40     "sp",
  41     "a0",
  42     "a1",
  43     "a2",
  44     "a3",
  45     "a4",
  46     "a5",
  47     "a6",
  48     "a7",
  49     "t0",
  50     "t1",
  51     "t2",
  52     "t3",
  53     "t4",
  54     "t5",
  55     "t6",
  56     "t7",
  57     "t8",
  58     "r21", /* reserved in the LP64* ABI, hence no ABI name */
  59     "s9",
  60     "s0",
  61     "s1",
  62     "s2",
  63     "s3",
  64     "s4",
  65     "s5",
  66     "s6",
  67     "s7",
  68     "s8"
  69 };
  70 #endif
  71
  72 static const int tcg_target_reg_alloc_order[] = {
  73     /* Registers preserved across calls */
  74     /* TCG_REG_S0 reserved for TCG_AREG0 */
  75     TCG_REG_S1,
  76     TCG_REG_S2,
  77     TCG_REG_S3,
  78     TCG_REG_S4,
  79     TCG_REG_S5,
  80     TCG_REG_S6,
  81     TCG_REG_S7,
  82     TCG_REG_S8,
  83     TCG_REG_S9,
  84
  85     /* Registers (potentially) clobbered across calls */
  86     TCG_REG_T0,
  87     TCG_REG_T1,
  88     TCG_REG_T2,
  89     TCG_REG_T3,
  90     TCG_REG_T4,
  91     TCG_REG_T5,
  92     TCG_REG_T6,
  93     TCG_REG_T7,
  94     TCG_REG_T8,
  95
  96     /* Argument registers, opposite order of allocation.  */
  97     TCG_REG_A7,
  98     TCG_REG_A6,
  99     TCG_REG_A5,
 100     TCG_REG_A4,
 101     TCG_REG_A3,
 102     TCG_REG_A2,
 103     TCG_REG_A1,
 104     TCG_REG_A0,
 105 };
 106
 107 static const int tcg_target_call_iarg_regs[] = {
 108     TCG_REG_A0,
 109     TCG_REG_A1,
 110     TCG_REG_A2,
 111     TCG_REG_A3,
 112     TCG_REG_A4,
 113     TCG_REG_A5,
 114     TCG_REG_A6,
 115     TCG_REG_A7,
 116 };
 117
 118 static TCGReg tcg_target_call_oarg_reg(TCGCallReturnKind kind, int slot)
 119 {
 120     tcg_debug_assert(kind == TCG_CALL_RET_NORMAL);
 121     tcg_debug_assert(slot >= 0 && slot <= 1);
 122     return TCG_REG_A0 + slot;
 123 }
 124
 125 #ifndef CONFIG_SOFTMMU
 126 #define USE_GUEST_BASE     (guest_base != 0)
 127 #define TCG_GUEST_BASE_REG TCG_REG_S1
 128 #endif
 129
 130 #define TCG_CT_CONST_ZERO  0x100
 131 #define TCG_CT_CONST_S12   0x200
 132 #define TCG_CT_CONST_S32   0x400
 133 #define TCG_CT_CONST_U12   0x800
 134 #define TCG_CT_CONST_C12   0x1000
 135 #define TCG_CT_CONST_WSZ   0x2000
 136
 137 #define ALL_GENERAL_REGS   MAKE_64BIT_MASK(0, 32)
 138
 139 static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
 140 {
 141     return sextract64(val, pos, len);
 142 }
 143
 144 /* test if a constant matches the constraint */
 145 static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
 146 {
 147     if (ct & TCG_CT_CONST) {
 148         return true;
 149     }
 150     if ((ct & TCG_CT_CONST_ZERO) && val == 0) {
 151         return true;
 152     }
 153     if ((ct & TCG_CT_CONST_S12) && val == sextreg(val, 0, 12)) {
 154         return true;
 155     }
 156     if ((ct & TCG_CT_CONST_S32) && val == (int32_t)val) {
 157         return true;
 158     }
 159     if ((ct & TCG_CT_CONST_U12) && val >= 0 && val <= 0xfff) {
 160         return true;
 161     }
 162     if ((ct & TCG_CT_CONST_C12) && ~val >= 0 && ~val <= 0xfff) {
 163         return true;
 164     }
 165     if ((ct & TCG_CT_CONST_WSZ) && val == (type == TCG_TYPE_I32 ? 32 : 64)) {
 166         return true;
 167     }
 168     return false;
 169 }
 170
 171 /*
 172  * Relocations
 173  */
 174
 175 /*
 176  * Relocation records defined in LoongArch ELF psABI v1.00 is way too
 177  * complicated; a whopping stack machine is needed to stuff the fields, at
 178  * the very least one SOP_PUSH and one SOP_POP (of the correct format) are
 179  * needed.
 180  *
 181  * Hence, define our own simpler relocation types. Numbers are chosen as to
 182  * not collide with potential future additions to the true ELF relocation
 183  * type enum.
 184  */
 185
 186 /* Field Sk16, shifted right by 2; suitable for conditional jumps */
 187 #define R_LOONGARCH_BR_SK16     256
 188 /* Field Sd10k16, shifted right by 2; suitable for B and BL */
 189 #define R_LOONGARCH_BR_SD10K16  257
 190
 191 static bool reloc_br_sk16(tcg_insn_unit *src_rw, const tcg_insn_unit *target)
 192 {
 193     const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
 194     intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
 195
 196     tcg_debug_assert((offset & 3) == 0);
 197     offset >>= 2;
 198     if (offset == sextreg(offset, 0, 16)) {
 199         *src_rw = deposit64(*src_rw, 10, 16, offset);
 200         return true;
 201     }
 202
 203     return false;
 204 }
 205
 206 static bool reloc_br_sd10k16(tcg_insn_unit *src_rw,
 207                              const tcg_insn_unit *target)
 208 {
 209     const tcg_insn_unit *src_rx = tcg_splitwx_to_rx(src_rw);
 210     intptr_t offset = (intptr_t)target - (intptr_t)src_rx;
 211
 212     tcg_debug_assert((offset & 3) == 0);
 213     offset >>= 2;
 214     if (offset == sextreg(offset, 0, 26)) {
 215         *src_rw = deposit64(*src_rw, 0, 10, offset >> 16); /* slot d10 */
 216         *src_rw = deposit64(*src_rw, 10, 16, offset); /* slot k16 */
 217         return true;
 218     }
 219
 220     return false;
 221 }
 222
 223 static bool patch_reloc(tcg_insn_unit *code_ptr, int type,
 224                         intptr_t value, intptr_t addend)
 225 {
 226     tcg_debug_assert(addend == 0);
 227     switch (type) {
 228     case R_LOONGARCH_BR_SK16:
 229         return reloc_br_sk16(code_ptr, (tcg_insn_unit *)value);
 230     case R_LOONGARCH_BR_SD10K16:
 231         return reloc_br_sd10k16(code_ptr, (tcg_insn_unit *)value);
 232     default:
 233         g_assert_not_reached();
 234     }
 235 }
 236
 237 #include "tcg-insn-defs.c.inc"
 238
 239 /*
 240  * TCG intrinsics
 241  */
 242
 243 static void tcg_out_mb(TCGContext *s, TCGArg a0)
 244 {
 245     /* Baseline LoongArch only has the full barrier, unfortunately.  */
 246     tcg_out_opc_dbar(s, 0);
 247 }
 248
 249 static bool tcg_out_mov(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
 250 {
 251     if (ret == arg) {
 252         return true;
 253     }
 254     switch (type) {
 255     case TCG_TYPE_I32:
 256     case TCG_TYPE_I64:
 257         /*
 258          * Conventional register-register move used in LoongArch is
 259          * `or dst, src, zero`.
 260          */
 261         tcg_out_opc_or(s, ret, arg, TCG_REG_ZERO);
 262         break;
 263     default:
 264         g_assert_not_reached();
 265     }
 266     return true;
 267 }
 268
 269 /* Loads a 32-bit immediate into rd, sign-extended.  */
 270 static void tcg_out_movi_i32(TCGContext *s, TCGReg rd, int32_t val)
 271 {
 272     tcg_target_long lo = sextreg(val, 0, 12);
 273     tcg_target_long hi12 = sextreg(val, 12, 20);
 274
 275     /* Single-instruction cases.  */
 276     if (hi12 == 0) {
 277         /* val fits in uimm12: ori rd, zero, val */
 278         tcg_out_opc_ori(s, rd, TCG_REG_ZERO, val);
 279         return;
 280     }
 281     if (hi12 == sextreg(lo, 12, 20)) {
 282         /* val fits in simm12: addi.w rd, zero, val */
 283         tcg_out_opc_addi_w(s, rd, TCG_REG_ZERO, val);
 284         return;
 285     }
 286
 287     /* High bits must be set; load with lu12i.w + optional ori.  */
 288     tcg_out_opc_lu12i_w(s, rd, hi12);
 289     if (lo != 0) {
 290         tcg_out_opc_ori(s, rd, rd, lo & 0xfff);
 291     }
 292 }
 293
 294 static void tcg_out_movi(TCGContext *s, TCGType type, TCGReg rd,
 295                          tcg_target_long val)
 296 {
 297     /*
 298      * LoongArch conventionally loads 64-bit immediates in at most 4 steps,
 299      * with dedicated instructions for filling the respective bitfields
 300      * below:
 301      *
 302      *        6                   5                   4               3
 303      *  3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2
 304      * +-----------------------+---------------------------------------+...
 305      * |          hi52         |                  hi32                 |
 306      * +-----------------------+---------------------------------------+...
 307      *       3                   2                   1
 308      *     1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 309      * ...+-------------------------------------+-------------------------+
 310      *    |                 hi12                |            lo           |
 311      * ...+-------------------------------------+-------------------------+
 312      *
 313      * Check if val belong to one of the several fast cases, before falling
 314      * back to the slow path.
 315      */
 316
 317     intptr_t pc_offset;
 318     tcg_target_long val_lo, val_hi, pc_hi, offset_hi;
 319     tcg_target_long hi12, hi32, hi52;
 320
 321     /* Value fits in signed i32.  */
 322     if (type == TCG_TYPE_I32 || val == (int32_t)val) {
 323         tcg_out_movi_i32(s, rd, val);
 324         return;
 325     }
 326
 327     /* PC-relative cases.  */
 328     pc_offset = tcg_pcrel_diff(s, (void *)val);
 329     if (pc_offset == sextreg(pc_offset, 0, 22) && (pc_offset & 3) == 0) {
 330         /* Single pcaddu2i.  */
 331         tcg_out_opc_pcaddu2i(s, rd, pc_offset >> 2);
 332         return;
 333     }
 334
 335     if (pc_offset == (int32_t)pc_offset) {
 336         /* Offset within 32 bits; load with pcalau12i + ori.  */
 337         val_lo = sextreg(val, 0, 12);
 338         val_hi = val >> 12;
 339         pc_hi = (val - pc_offset) >> 12;
 340         offset_hi = val_hi - pc_hi;
 341
 342         tcg_debug_assert(offset_hi == sextreg(offset_hi, 0, 20));
 343         tcg_out_opc_pcalau12i(s, rd, offset_hi);
 344         if (val_lo != 0) {
 345             tcg_out_opc_ori(s, rd, rd, val_lo & 0xfff);
 346         }
 347         return;
 348     }
 349
 350     hi12 = sextreg(val, 12, 20);
 351     hi32 = sextreg(val, 32, 20);
 352     hi52 = sextreg(val, 52, 12);
 353
 354     /* Single cu52i.d case.  */
 355     if ((hi52 != 0) && (ctz64(val) >= 52)) {
 356         tcg_out_opc_cu52i_d(s, rd, TCG_REG_ZERO, hi52);
 357         return;
 358     }
 359
 360     /* Slow path.  Initialize the low 32 bits, then concat high bits.  */
 361     tcg_out_movi_i32(s, rd, val);
 362
 363     /* Load hi32 and hi52 explicitly when they are unexpected values. */
 364     if (hi32 != sextreg(hi12, 20, 20)) {
 365         tcg_out_opc_cu32i_d(s, rd, hi32);
 366     }
 367
 368     if (hi52 != sextreg(hi32, 20, 12)) {
 369         tcg_out_opc_cu52i_d(s, rd, rd, hi52);
 370     }
 371 }
 372
 373 static void tcg_out_addi(TCGContext *s, TCGType type, TCGReg rd,
 374                          TCGReg rs, tcg_target_long imm)
 375 {
 376     tcg_target_long lo12 = sextreg(imm, 0, 12);
 377     tcg_target_long hi16 = sextreg(imm - lo12, 16, 16);
 378
 379     /*
 380      * Note that there's a hole in between hi16 and lo12:
 381      *
 382      *       3                   2                   1                   0
 383      *     1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
 384      * ...+-------------------------------+-------+-----------------------+
 385      *    |             hi16              |       |          lo12         |
 386      * ...+-------------------------------+-------+-----------------------+
 387      *
 388      * For bits within that hole, it's more efficient to use LU12I and ADD.
 389      */
 390     if (imm == (hi16 << 16) + lo12) {
 391         if (hi16) {
 392             tcg_out_opc_addu16i_d(s, rd, rs, hi16);
 393             rs = rd;
 394         }
 395         if (type == TCG_TYPE_I32) {
 396             tcg_out_opc_addi_w(s, rd, rs, lo12);
 397         } else if (lo12) {
 398             tcg_out_opc_addi_d(s, rd, rs, lo12);
 399         } else {
 400             tcg_out_mov(s, type, rd, rs);
 401         }
 402     } else {
 403         tcg_out_movi(s, type, TCG_REG_TMP0, imm);
 404         if (type == TCG_TYPE_I32) {
 405             tcg_out_opc_add_w(s, rd, rs, TCG_REG_TMP0);
 406         } else {
 407             tcg_out_opc_add_d(s, rd, rs, TCG_REG_TMP0);
 408         }
 409     }
 410 }
 411
 412 static bool tcg_out_xchg(TCGContext *s, TCGType type, TCGReg r1, TCGReg r2)
 413 {
 414     return false;
 415 }
 416
 417 static void tcg_out_addi_ptr(TCGContext *s, TCGReg rd, TCGReg rs,
 418                              tcg_target_long imm)
 419 {
 420     /* This function is only used for passing structs by reference. */
 421     g_assert_not_reached();
 422 }
 423
 424 static void tcg_out_ext8u(TCGContext *s, TCGReg ret, TCGReg arg)
 425 {
 426     tcg_out_opc_andi(s, ret, arg, 0xff);
 427 }
 428
 429 static void tcg_out_ext16u(TCGContext *s, TCGReg ret, TCGReg arg)
 430 {
 431     tcg_out_opc_bstrpick_w(s, ret, arg, 0, 15);
 432 }
 433
 434 static void tcg_out_ext32u(TCGContext *s, TCGReg ret, TCGReg arg)
 435 {
 436     tcg_out_opc_bstrpick_d(s, ret, arg, 0, 31);
 437 }
 438
 439 static void tcg_out_ext8s(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
 440 {
 441     tcg_out_opc_sext_b(s, ret, arg);
 442 }
 443
 444 static void tcg_out_ext16s(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg)
 445 {
 446     tcg_out_opc_sext_h(s, ret, arg);
 447 }
 448
 449 static void tcg_out_ext32s(TCGContext *s, TCGReg ret, TCGReg arg)
 450 {
 451     tcg_out_opc_addi_w(s, ret, arg, 0);
 452 }
 453
 454 static void tcg_out_exts_i32_i64(TCGContext *s, TCGReg ret, TCGReg arg)
 455 {
 456     if (ret != arg) {
 457         tcg_out_ext32s(s, ret, arg);
 458     }
 459 }
 460
 461 static void tcg_out_extu_i32_i64(TCGContext *s, TCGReg ret, TCGReg arg)
 462 {
 463     tcg_out_ext32u(s, ret, arg);
 464 }
 465
 466 static void tcg_out_extrl_i64_i32(TCGContext *s, TCGReg ret, TCGReg arg)
 467 {
 468     tcg_out_ext32s(s, ret, arg);
 469 }
 470
 471 static void tcg_out_clzctz(TCGContext *s, LoongArchInsn opc,
 472                            TCGReg a0, TCGReg a1, TCGReg a2,
 473                            bool c2, bool is_32bit)
 474 {
 475     if (c2) {
 476         /*
 477          * Fast path: semantics already satisfied due to constraint and
 478          * insn behavior, single instruction is enough.
 479          */
 480         tcg_debug_assert(a2 == (is_32bit ? 32 : 64));
 481         /* all clz/ctz insns belong to DJ-format */
 482         tcg_out32(s, encode_dj_insn(opc, a0, a1));
 483         return;
 484     }
 485
 486     tcg_out32(s, encode_dj_insn(opc, TCG_REG_TMP0, a1));
 487     /* a0 = a1 ? REG_TMP0 : a2 */
 488     tcg_out_opc_maskeqz(s, TCG_REG_TMP0, TCG_REG_TMP0, a1);
 489     tcg_out_opc_masknez(s, a0, a2, a1);
 490     tcg_out_opc_or(s, a0, TCG_REG_TMP0, a0);
 491 }
 492
 493 #define SETCOND_INV    TCG_TARGET_NB_REGS
 494 #define SETCOND_NEZ    (SETCOND_INV << 1)
 495 #define SETCOND_FLAGS  (SETCOND_INV | SETCOND_NEZ)
 496
 497 static int tcg_out_setcond_int(TCGContext *s, TCGCond cond, TCGReg ret,
 498                                TCGReg arg1, tcg_target_long arg2, bool c2)
 499 {
 500     int flags = 0;
 501
 502     switch (cond) {
 503     case TCG_COND_EQ:    /* -> NE  */
 504     case TCG_COND_GE:    /* -> LT  */
 505     case TCG_COND_GEU:   /* -> LTU */
 506     case TCG_COND_GT:    /* -> LE  */
 507     case TCG_COND_GTU:   /* -> LEU */
 508         cond = tcg_invert_cond(cond);
 509         flags ^= SETCOND_INV;
 510         break;
 511     default:
 512         break;
 513     }
 514
 515     switch (cond) {
 516     case TCG_COND_LE:
 517     case TCG_COND_LEU:
 518         /*
 519          * If we have a constant input, the most efficient way to implement
 520          * LE is by adding 1 and using LT.  Watch out for wrap around for LEU.
 521          * We don't need to care for this for LE because the constant input
 522          * is still constrained to int32_t, and INT32_MAX+1 is representable
 523          * in the 64-bit temporary register.
 524          */
 525         if (c2) {
 526             if (cond == TCG_COND_LEU) {
 527                 /* unsigned <= -1 is true */
 528                 if (arg2 == -1) {
 529                     tcg_out_movi(s, TCG_TYPE_REG, ret, !(flags & SETCOND_INV));
 530                     return ret;
 531                 }
 532                 cond = TCG_COND_LTU;
 533             } else {
 534                 cond = TCG_COND_LT;
 535             }
 536             arg2 += 1;
 537         } else {
 538             TCGReg tmp = arg2;
 539             arg2 = arg1;
 540             arg1 = tmp;
 541             cond = tcg_swap_cond(cond);    /* LE -> GE */
 542             cond = tcg_invert_cond(cond);  /* GE -> LT */
 543             flags ^= SETCOND_INV;
 544         }
 545         break;
 546     default:
 547         break;
 548     }
 549
 550     switch (cond) {
 551     case TCG_COND_NE:
 552         flags |= SETCOND_NEZ;
 553         if (!c2) {
 554             tcg_out_opc_xor(s, ret, arg1, arg2);
 555         } else if (arg2 == 0) {
 556             ret = arg1;
 557         } else if (arg2 >= 0 && arg2 <= 0xfff) {
 558             tcg_out_opc_xori(s, ret, arg1, arg2);
 559         } else {
 560             tcg_out_addi(s, TCG_TYPE_REG, ret, arg1, -arg2);
 561         }
 562         break;
 563
 564     case TCG_COND_LT:
 565     case TCG_COND_LTU:
 566         if (c2) {
 567             if (arg2 >= -0x800 && arg2 <= 0x7ff) {
 568                 if (cond == TCG_COND_LT) {
 569                     tcg_out_opc_slti(s, ret, arg1, arg2);
 570                 } else {
 571                     tcg_out_opc_sltui(s, ret, arg1, arg2);
 572                 }
 573                 break;
 574             }
 575             tcg_out_movi(s, TCG_TYPE_REG, TCG_REG_TMP0, arg2);
 576             arg2 = TCG_REG_TMP0;
 577         }
 578         if (cond == TCG_COND_LT) {
 579             tcg_out_opc_slt(s, ret, arg1, arg2);
 580         } else {
 581             tcg_out_opc_sltu(s, ret, arg1, arg2);
 582         }
 583         break;
 584
 585     default:
 586         g_assert_not_reached();
 587         break;
 588     }
 589
 590     return ret | flags;
 591 }
 592
 593 static void tcg_out_setcond(TCGContext *s, TCGCond cond, TCGReg ret,
 594                             TCGReg arg1, tcg_target_long arg2, bool c2)
 595 {
 596     int tmpflags = tcg_out_setcond_int(s, cond, ret, arg1, arg2, c2);
 597
 598     if (tmpflags != ret) {
 599         TCGReg tmp = tmpflags & ~SETCOND_FLAGS;
 600
 601         switch (tmpflags & SETCOND_FLAGS) {
 602         case SETCOND_INV:
 603             /* Intermediate result is boolean: simply invert. */
 604             tcg_out_opc_xori(s, ret, tmp, 1);
 605             break;
 606         case SETCOND_NEZ:
 607             /* Intermediate result is zero/non-zero: test != 0. */
 608             tcg_out_opc_sltu(s, ret, TCG_REG_ZERO, tmp);
 609             break;
 610         case SETCOND_NEZ | SETCOND_INV:
 611             /* Intermediate result is zero/non-zero: test == 0. */
 612             tcg_out_opc_sltui(s, ret, tmp, 1);
 613             break;
 614         default:
 615             g_assert_not_reached();
 616         }
 617     }
 618 }
 619
 620 static void tcg_out_movcond(TCGContext *s, TCGCond cond, TCGReg ret,
 621                             TCGReg c1, tcg_target_long c2, bool const2,
 622                             TCGReg v1, TCGReg v2)
 623 {
 624     int tmpflags = tcg_out_setcond_int(s, cond, TCG_REG_TMP0, c1, c2, const2);
 625     TCGReg t;
 626
 627     /* Standardize the test below to t != 0. */
 628     if (tmpflags & SETCOND_INV) {
 629         t = v1, v1 = v2, v2 = t;
 630     }
 631
 632     t = tmpflags & ~SETCOND_FLAGS;
 633     if (v1 == TCG_REG_ZERO) {
 634         tcg_out_opc_masknez(s, ret, v2, t);
 635     } else if (v2 == TCG_REG_ZERO) {
 636         tcg_out_opc_maskeqz(s, ret, v1, t);
 637     } else {
 638         tcg_out_opc_masknez(s, TCG_REG_TMP2, v2, t); /* t ? 0 : v2 */
 639         tcg_out_opc_maskeqz(s, TCG_REG_TMP1, v1, t); /* t ? v1 : 0 */
 640         tcg_out_opc_or(s, ret, TCG_REG_TMP1, TCG_REG_TMP2);
 641     }
 642 }
 643
 644 /*
 645  * Branch helpers
 646  */
 647
 648 static const struct {
 649     LoongArchInsn op;
 650     bool swap;
 651 } tcg_brcond_to_loongarch[] = {
 652     [TCG_COND_EQ] =  { OPC_BEQ,  false },
 653     [TCG_COND_NE] =  { OPC_BNE,  false },
 654     [TCG_COND_LT] =  { OPC_BGT,  true  },
 655     [TCG_COND_GE] =  { OPC_BLE,  true  },
 656     [TCG_COND_LE] =  { OPC_BLE,  false },
 657     [TCG_COND_GT] =  { OPC_BGT,  false },
 658     [TCG_COND_LTU] = { OPC_BGTU, true  },
 659     [TCG_COND_GEU] = { OPC_BLEU, true  },
 660     [TCG_COND_LEU] = { OPC_BLEU, false },
 661     [TCG_COND_GTU] = { OPC_BGTU, false }
 662 };
 663
 664 static void tcg_out_brcond(TCGContext *s, TCGCond cond, TCGReg arg1,
 665                            TCGReg arg2, TCGLabel *l)
 666 {
 667     LoongArchInsn op = tcg_brcond_to_loongarch[cond].op;
 668
 669     tcg_debug_assert(op != 0);
 670
 671     if (tcg_brcond_to_loongarch[cond].swap) {
 672         TCGReg t = arg1;
 673         arg1 = arg2;
 674         arg2 = t;
 675     }
 676
 677     /* all conditional branch insns belong to DJSk16-format */
 678     tcg_out_reloc(s, s->code_ptr, R_LOONGARCH_BR_SK16, l, 0);
 679     tcg_out32(s, encode_djsk16_insn(op, arg1, arg2, 0));
 680 }
 681
 682 static void tcg_out_call_int(TCGContext *s, const tcg_insn_unit *arg, bool tail)
 683 {
 684     TCGReg link = tail ? TCG_REG_ZERO : TCG_REG_RA;
 685     ptrdiff_t offset = tcg_pcrel_diff(s, arg);
 686
 687     tcg_debug_assert((offset & 3) == 0);
 688     if (offset == sextreg(offset, 0, 28)) {
 689         /* short jump: +/- 256MiB */
 690         if (tail) {
 691             tcg_out_opc_b(s, offset >> 2);
 692         } else {
 693             tcg_out_opc_bl(s, offset >> 2);
 694         }
 695     } else if (offset == sextreg(offset, 0, 38)) {
 696         /* long jump: +/- 256GiB */
 697         tcg_target_long lo = sextreg(offset, 0, 18);
 698         tcg_target_long hi = offset - lo;
 699         tcg_out_opc_pcaddu18i(s, TCG_REG_TMP0, hi >> 18);
 700         tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
 701     } else {
 702         /* far jump: 64-bit */
 703         tcg_target_long lo = sextreg((tcg_target_long)arg, 0, 18);
 704         tcg_target_long hi = (tcg_target_long)arg - lo;
 705         tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP0, hi);
 706         tcg_out_opc_jirl(s, link, TCG_REG_TMP0, lo >> 2);
 707     }
 708 }
 709
 710 static void tcg_out_call(TCGContext *s, const tcg_insn_unit *arg,
 711                          const TCGHelperInfo *info)
 712 {
 713     tcg_out_call_int(s, arg, false);
 714 }
 715
 716 /*
 717  * Load/store helpers
 718  */
 719
 720 static void tcg_out_ldst(TCGContext *s, LoongArchInsn opc, TCGReg data,
 721                          TCGReg addr, intptr_t offset)
 722 {
 723     intptr_t imm12 = sextreg(offset, 0, 12);
 724
 725     if (offset != imm12) {
 726         intptr_t diff = tcg_pcrel_diff(s, (void *)offset);
 727
 728         if (addr == TCG_REG_ZERO && diff == (int32_t)diff) {
 729             imm12 = sextreg(diff, 0, 12);
 730             tcg_out_opc_pcaddu12i(s, TCG_REG_TMP2, (diff - imm12) >> 12);
 731         } else {
 732             tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_TMP2, offset - imm12);
 733             if (addr != TCG_REG_ZERO) {
 734                 tcg_out_opc_add_d(s, TCG_REG_TMP2, TCG_REG_TMP2, addr);
 735             }
 736         }
 737         addr = TCG_REG_TMP2;
 738     }
 739
 740     switch (opc) {
 741     case OPC_LD_B:
 742     case OPC_LD_BU:
 743     case OPC_LD_H:
 744     case OPC_LD_HU:
 745     case OPC_LD_W:
 746     case OPC_LD_WU:
 747     case OPC_LD_D:
 748     case OPC_ST_B:
 749     case OPC_ST_H:
 750     case OPC_ST_W:
 751     case OPC_ST_D:
 752         tcg_out32(s, encode_djsk12_insn(opc, data, addr, imm12));
 753         break;
 754     default:
 755         g_assert_not_reached();
 756     }
 757 }
 758
 759 static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg arg,
 760                        TCGReg arg1, intptr_t arg2)
 761 {
 762     bool is_32bit = type == TCG_TYPE_I32;
 763     tcg_out_ldst(s, is_32bit ? OPC_LD_W : OPC_LD_D, arg, arg1, arg2);
 764 }
 765
 766 static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
 767                        TCGReg arg1, intptr_t arg2)
 768 {
 769     bool is_32bit = type == TCG_TYPE_I32;
 770     tcg_out_ldst(s, is_32bit ? OPC_ST_W : OPC_ST_D, arg, arg1, arg2);
 771 }
 772
 773 static bool tcg_out_sti(TCGContext *s, TCGType type, TCGArg val,
 774                         TCGReg base, intptr_t ofs)
 775 {
 776     if (val == 0) {
 777         tcg_out_st(s, type, TCG_REG_ZERO, base, ofs);
 778         return true;
 779     }
 780     return false;
 781 }
 782
 783 /*
 784  * Load/store helpers for SoftMMU, and qemu_ld/st implementations
 785  */
 786
 787 static bool tcg_out_goto(TCGContext *s, const tcg_insn_unit *target)
 788 {
 789     tcg_out_opc_b(s, 0);
 790     return reloc_br_sd10k16(s->code_ptr - 1, target);
 791 }
 792
 793 static const TCGLdstHelperParam ldst_helper_param = {
 794     .ntmp = 1, .tmp = { TCG_REG_TMP0 }
 795 };
 796
 797 static bool tcg_out_qemu_ld_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
 798 {
 799     MemOp opc = get_memop(l->oi);
 800
 801     /* resolve label address */
 802     if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
 803         return false;
 804     }
 805
 806     tcg_out_ld_helper_args(s, l, &ldst_helper_param);
 807     tcg_out_call_int(s, qemu_ld_helpers[opc & MO_SIZE], false);
 808     tcg_out_ld_helper_ret(s, l, false, &ldst_helper_param);
 809     return tcg_out_goto(s, l->raddr);
 810 }
 811
 812 static bool tcg_out_qemu_st_slow_path(TCGContext *s, TCGLabelQemuLdst *l)
 813 {
 814     MemOp opc = get_memop(l->oi);
 815
 816     /* resolve label address */
 817     if (!reloc_br_sk16(l->label_ptr[0], tcg_splitwx_to_rx(s->code_ptr))) {
 818         return false;
 819     }
 820
 821     tcg_out_st_helper_args(s, l, &ldst_helper_param);
 822     tcg_out_call_int(s, qemu_st_helpers[opc & MO_SIZE], false);
 823     return tcg_out_goto(s, l->raddr);
 824 }
 825
 826 typedef struct {
 827     TCGReg base;
 828     TCGReg index;
 829     TCGAtomAlign aa;
 830 } HostAddress;
 831
 832 bool tcg_target_has_memory_bswap(MemOp memop)
 833 {
 834     return false;
 835 }
 836
 837 /*
 838  * For softmmu, perform the TLB load and compare.
 839  * For useronly, perform any required alignment tests.
 840  * In both cases, return a TCGLabelQemuLdst structure if the slow path
 841  * is required and fill in @h with the host address for the fast path.
 842  */
 843 static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
 844                                            TCGReg addr_reg, MemOpIdx oi,
 845                                            bool is_ld)
 846 {
 847     TCGType addr_type = s->addr_type;
 848     TCGLabelQemuLdst *ldst = NULL;
 849     MemOp opc = get_memop(oi);
 850     MemOp a_bits;
 851
 852     h->aa = atom_and_align_for_opc(s, opc, MO_ATOM_IFALIGN, false);
 853     a_bits = h->aa.align;
 854
 855 #ifdef CONFIG_SOFTMMU
 856     unsigned s_bits = opc & MO_SIZE;
 857     int mem_index = get_mmuidx(oi);
 858     int fast_ofs = TLB_MASK_TABLE_OFS(mem_index);
 859     int mask_ofs = fast_ofs + offsetof(CPUTLBDescFast, mask);
 860     int table_ofs = fast_ofs + offsetof(CPUTLBDescFast, table);
 861
 862     ldst = new_ldst_label(s);
 863     ldst->is_ld = is_ld;
 864     ldst->oi = oi;
 865     ldst->addrlo_reg = addr_reg;
 866
 867     QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) > 0);
 868     QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) < -(1 << 11));
 869     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, TCG_AREG0, mask_ofs);
 870     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP1, TCG_AREG0, table_ofs);
 871
 872     tcg_out_opc_srli_d(s, TCG_REG_TMP2, addr_reg,
 873                     s->page_bits - CPU_TLB_ENTRY_BITS);
 874     tcg_out_opc_and(s, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP0);
 875     tcg_out_opc_add_d(s, TCG_REG_TMP2, TCG_REG_TMP2, TCG_REG_TMP1);
 876
 877     /* Load the tlb comparator and the addend.  */
 878     tcg_out_ld(s, addr_type, TCG_REG_TMP0, TCG_REG_TMP2,
 879                is_ld ? offsetof(CPUTLBEntry, addr_read)
 880                      : offsetof(CPUTLBEntry, addr_write));
 881     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP2, TCG_REG_TMP2,
 882                offsetof(CPUTLBEntry, addend));
 883
 884     /*
 885      * For aligned accesses, we check the first byte and include the alignment
 886      * bits within the address.  For unaligned access, we check that we don't
 887      * cross pages using the address of the last byte of the access.
 888      */
 889     if (a_bits < s_bits) {
 890         unsigned a_mask = (1u << a_bits) - 1;
 891         unsigned s_mask = (1u << s_bits) - 1;
 892         tcg_out_addi(s, addr_type, TCG_REG_TMP1, addr_reg, s_mask - a_mask);
 893     } else {
 894         tcg_out_mov(s, addr_type, TCG_REG_TMP1, addr_reg);
 895     }
 896     tcg_out_opc_bstrins_d(s, TCG_REG_TMP1, TCG_REG_ZERO,
 897                           a_bits, s->page_bits - 1);
 898
 899     /* Compare masked address with the TLB entry.  */
 900     ldst->label_ptr[0] = s->code_ptr;
 901     tcg_out_opc_bne(s, TCG_REG_TMP0, TCG_REG_TMP1, 0);
 902
 903     h->index = TCG_REG_TMP2;
 904 #else
 905     if (a_bits) {
 906         ldst = new_ldst_label(s);
 907
 908         ldst->is_ld = is_ld;
 909         ldst->oi = oi;
 910         ldst->addrlo_reg = addr_reg;
 911
 912         /*
 913          * Without micro-architecture details, we don't know which of
 914          * bstrpick or andi is faster, so use bstrpick as it's not
 915          * constrained by imm field width. Not to say alignments >= 2^12
 916          * are going to happen any time soon.
 917          */
 918         tcg_out_opc_bstrpick_d(s, TCG_REG_TMP1, addr_reg, 0, a_bits - 1);
 919
 920         ldst->label_ptr[0] = s->code_ptr;
 921         tcg_out_opc_bne(s, TCG_REG_TMP1, TCG_REG_ZERO, 0);
 922     }
 923
 924     h->index = USE_GUEST_BASE ? TCG_GUEST_BASE_REG : TCG_REG_ZERO;
 925 #endif
 926
 927     if (addr_type == TCG_TYPE_I32) {
 928         h->base = TCG_REG_TMP0;
 929         tcg_out_ext32u(s, h->base, addr_reg);
 930     } else {
 931         h->base = addr_reg;
 932     }
 933
 934     return ldst;
 935 }
 936
 937 static void tcg_out_qemu_ld_indexed(TCGContext *s, MemOp opc, TCGType type,
 938                                     TCGReg rd, HostAddress h)
 939 {
 940     /* Byte swapping is left to middle-end expansion.  */
 941     tcg_debug_assert((opc & MO_BSWAP) == 0);
 942
 943     switch (opc & MO_SSIZE) {
 944     case MO_UB:
 945         tcg_out_opc_ldx_bu(s, rd, h.base, h.index);
 946         break;
 947     case MO_SB:
 948         tcg_out_opc_ldx_b(s, rd, h.base, h.index);
 949         break;
 950     case MO_UW:
 951         tcg_out_opc_ldx_hu(s, rd, h.base, h.index);
 952         break;
 953     case MO_SW:
 954         tcg_out_opc_ldx_h(s, rd, h.base, h.index);
 955         break;
 956     case MO_UL:
 957         if (type == TCG_TYPE_I64) {
 958             tcg_out_opc_ldx_wu(s, rd, h.base, h.index);
 959             break;
 960         }
 961         /* fallthrough */
 962     case MO_SL:
 963         tcg_out_opc_ldx_w(s, rd, h.base, h.index);
 964         break;
 965     case MO_UQ:
 966         tcg_out_opc_ldx_d(s, rd, h.base, h.index);
 967         break;
 968     default:
 969         g_assert_not_reached();
 970     }
 971 }
 972
 973 static void tcg_out_qemu_ld(TCGContext *s, TCGReg data_reg, TCGReg addr_reg,
 974                             MemOpIdx oi, TCGType data_type)
 975 {
 976     TCGLabelQemuLdst *ldst;
 977     HostAddress h;
 978
 979     ldst = prepare_host_addr(s, &h, addr_reg, oi, true);
 980     tcg_out_qemu_ld_indexed(s, get_memop(oi), data_type, data_reg, h);
 981
 982     if (ldst) {
 983         ldst->type = data_type;
 984         ldst->datalo_reg = data_reg;
 985         ldst->raddr = tcg_splitwx_to_rx(s->code_ptr);
 986     }
 987 }
 988
 989 static void tcg_out_qemu_st_indexed(TCGContext *s, MemOp opc,
 990                                     TCGReg rd, HostAddress h)
 991 {
 992     /* Byte swapping is left to middle-end expansion.  */
 993     tcg_debug_assert((opc & MO_BSWAP) == 0);
 994
 995     switch (opc & MO_SIZE) {
 996     case MO_8:
 997         tcg_out_opc_stx_b(s, rd, h.base, h.index);
 998         break;
 999     case MO_16:
1000         tcg_out_opc_stx_h(s, rd, h.base, h.index);
1001         break;
1002     case MO_32:
1003         tcg_out_opc_stx_w(s, rd, h.base, h.index);
1004         break;
1005     case MO_64:
1006         tcg_out_opc_stx_d(s, rd, h.base, h.index);
1007         break;
1008     default:
1009         g_assert_not_reached();
1010     }
1011 }
1012
1013 static void tcg_out_qemu_st(TCGContext *s, TCGReg data_reg, TCGReg addr_reg,
1014                             MemOpIdx oi, TCGType data_type)
1015 {
1016     TCGLabelQemuLdst *ldst;
1017     HostAddress h;
1018
1019     ldst = prepare_host_addr(s, &h, addr_reg, oi, false);
1020     tcg_out_qemu_st_indexed(s, get_memop(oi), data_reg, h);
1021
1022     if (ldst) {
1023         ldst->type = data_type;
1024         ldst->datalo_reg = data_reg;
1025         ldst->raddr = tcg_splitwx_to_rx(s->code_ptr);
1026     }
1027 }
1028
1029 /*
1030  * Entry-points
1031  */
1032
1033 static const tcg_insn_unit *tb_ret_addr;
1034
1035 static void tcg_out_exit_tb(TCGContext *s, uintptr_t a0)
1036 {
1037     /* Reuse the zeroing that exists for goto_ptr.  */
1038     if (a0 == 0) {
1039         tcg_out_call_int(s, tcg_code_gen_epilogue, true);
1040     } else {
1041         tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_A0, a0);
1042         tcg_out_call_int(s, tb_ret_addr, true);
1043     }
1044 }
1045
1046 static void tcg_out_goto_tb(TCGContext *s, int which)
1047 {
1048     /*
1049      * Direct branch, or load indirect address, to be patched
1050      * by tb_target_set_jmp_target.  Check indirect load offset
1051      * in range early, regardless of direct branch distance,
1052      * via assert within tcg_out_opc_pcaddu2i.
1053      */
1054     uintptr_t i_addr = get_jmp_target_addr(s, which);
1055     intptr_t i_disp = tcg_pcrel_diff(s, (void *)i_addr);
1056
1057     set_jmp_insn_offset(s, which);
1058     tcg_out_opc_pcaddu2i(s, TCG_REG_TMP0, i_disp >> 2);
1059
1060     /* Finish the load and indirect branch. */
1061     tcg_out_ld(s, TCG_TYPE_PTR, TCG_REG_TMP0, TCG_REG_TMP0, 0);
1062     tcg_out_opc_jirl(s, TCG_REG_ZERO, TCG_REG_TMP0, 0);
1063     set_jmp_reset_offset(s, which);
1064 }
1065
1066 void tb_target_set_jmp_target(const TranslationBlock *tb, int n,
1067                               uintptr_t jmp_rx, uintptr_t jmp_rw)
1068 {
1069     uintptr_t d_addr = tb->jmp_target_addr[n];
1070     ptrdiff_t d_disp = (ptrdiff_t)(d_addr - jmp_rx) >> 2;
1071     tcg_insn_unit insn;
1072
1073     /* Either directly branch, or load slot address for indirect branch. */
1074     if (d_disp == sextreg(d_disp, 0, 26)) {
1075         insn = encode_sd10k16_insn(OPC_B, d_disp);
1076     } else {
1077         uintptr_t i_addr = (uintptr_t)&tb->jmp_target_addr[n];
1078         intptr_t i_disp = i_addr - jmp_rx;
1079         insn = encode_dsj20_insn(OPC_PCADDU2I, TCG_REG_TMP0, i_disp >> 2);
1080     }
1081
1082     qatomic_set((tcg_insn_unit *)jmp_rw, insn);
1083     flush_idcache_range(jmp_rx, jmp_rw, 4);
1084 }
1085
1086 static void tcg_out_op(TCGContext *s, TCGOpcode opc,
1087                        const TCGArg args[TCG_MAX_OP_ARGS],
1088                        const int const_args[TCG_MAX_OP_ARGS])
1089 {
1090     TCGArg a0 = args[0];
1091     TCGArg a1 = args[1];
1092     TCGArg a2 = args[2];
1093     int c2 = const_args[2];
1094
1095     switch (opc) {
1096     case INDEX_op_mb:
1097         tcg_out_mb(s, a0);
1098         break;
1099
1100     case INDEX_op_goto_ptr:
1101         tcg_out_opc_jirl(s, TCG_REG_ZERO, a0, 0);
1102         break;
1103
1104     case INDEX_op_br:
1105         tcg_out_reloc(s, s->code_ptr, R_LOONGARCH_BR_SD10K16, arg_label(a0),
1106                       0);
1107         tcg_out_opc_b(s, 0);
1108         break;
1109
1110     case INDEX_op_brcond_i32:
1111     case INDEX_op_brcond_i64:
1112         tcg_out_brcond(s, a2, a0, a1, arg_label(args[3]));
1113         break;
1114
1115     case INDEX_op_extrh_i64_i32:
1116         tcg_out_opc_srai_d(s, a0, a1, 32);
1117         break;
1118
1119     case INDEX_op_not_i32:
1120     case INDEX_op_not_i64:
1121         tcg_out_opc_nor(s, a0, a1, TCG_REG_ZERO);
1122         break;
1123
1124     case INDEX_op_nor_i32:
1125     case INDEX_op_nor_i64:
1126         if (c2) {
1127             tcg_out_opc_ori(s, a0, a1, a2);
1128             tcg_out_opc_nor(s, a0, a0, TCG_REG_ZERO);
1129         } else {
1130             tcg_out_opc_nor(s, a0, a1, a2);
1131         }
1132         break;
1133
1134     case INDEX_op_andc_i32:
1135     case INDEX_op_andc_i64:
1136         if (c2) {
1137             /* guaranteed to fit due to constraint */
1138             tcg_out_opc_andi(s, a0, a1, ~a2);
1139         } else {
1140             tcg_out_opc_andn(s, a0, a1, a2);
1141         }
1142         break;
1143
1144     case INDEX_op_orc_i32:
1145     case INDEX_op_orc_i64:
1146         if (c2) {
1147             /* guaranteed to fit due to constraint */
1148             tcg_out_opc_ori(s, a0, a1, ~a2);
1149         } else {
1150             tcg_out_opc_orn(s, a0, a1, a2);
1151         }
1152         break;
1153
1154     case INDEX_op_and_i32:
1155     case INDEX_op_and_i64:
1156         if (c2) {
1157             tcg_out_opc_andi(s, a0, a1, a2);
1158         } else {
1159             tcg_out_opc_and(s, a0, a1, a2);
1160         }
1161         break;
1162
1163     case INDEX_op_or_i32:
1164     case INDEX_op_or_i64:
1165         if (c2) {
1166             tcg_out_opc_ori(s, a0, a1, a2);
1167         } else {
1168             tcg_out_opc_or(s, a0, a1, a2);
1169         }
1170         break;
1171
1172     case INDEX_op_xor_i32:
1173     case INDEX_op_xor_i64:
1174         if (c2) {
1175             tcg_out_opc_xori(s, a0, a1, a2);
1176         } else {
1177             tcg_out_opc_xor(s, a0, a1, a2);
1178         }
1179         break;
1180
1181     case INDEX_op_extract_i32:
1182         tcg_out_opc_bstrpick_w(s, a0, a1, a2, a2 + args[3] - 1);
1183         break;
1184     case INDEX_op_extract_i64:
1185         tcg_out_opc_bstrpick_d(s, a0, a1, a2, a2 + args[3] - 1);
1186         break;
1187
1188     case INDEX_op_deposit_i32:
1189         tcg_out_opc_bstrins_w(s, a0, a2, args[3], args[3] + args[4] - 1);
1190         break;
1191     case INDEX_op_deposit_i64:
1192         tcg_out_opc_bstrins_d(s, a0, a2, args[3], args[3] + args[4] - 1);
1193         break;
1194
1195     case INDEX_op_bswap16_i32:
1196     case INDEX_op_bswap16_i64:
1197         tcg_out_opc_revb_2h(s, a0, a1);
1198         if (a2 & TCG_BSWAP_OS) {
1199             tcg_out_ext16s(s, TCG_TYPE_REG, a0, a0);
1200         } else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
1201             tcg_out_ext16u(s, a0, a0);
1202         }
1203         break;
1204
1205     case INDEX_op_bswap32_i32:
1206         /* All 32-bit values are computed sign-extended in the register.  */
1207         a2 = TCG_BSWAP_OS;
1208         /* fallthrough */
1209     case INDEX_op_bswap32_i64:
1210         tcg_out_opc_revb_2w(s, a0, a1);
1211         if (a2 & TCG_BSWAP_OS) {
1212             tcg_out_ext32s(s, a0, a0);
1213         } else if ((a2 & (TCG_BSWAP_IZ | TCG_BSWAP_OZ)) == TCG_BSWAP_OZ) {
1214             tcg_out_ext32u(s, a0, a0);
1215         }
1216         break;
1217
1218     case INDEX_op_bswap64_i64:
1219         tcg_out_opc_revb_d(s, a0, a1);
1220         break;
1221
1222     case INDEX_op_clz_i32:
1223         tcg_out_clzctz(s, OPC_CLZ_W, a0, a1, a2, c2, true);
1224         break;
1225     case INDEX_op_clz_i64:
1226         tcg_out_clzctz(s, OPC_CLZ_D, a0, a1, a2, c2, false);
1227         break;
1228
1229     case INDEX_op_ctz_i32:
1230         tcg_out_clzctz(s, OPC_CTZ_W, a0, a1, a2, c2, true);
1231         break;
1232     case INDEX_op_ctz_i64:
1233         tcg_out_clzctz(s, OPC_CTZ_D, a0, a1, a2, c2, false);
1234         break;
1235
1236     case INDEX_op_shl_i32:
1237         if (c2) {
1238             tcg_out_opc_slli_w(s, a0, a1, a2 & 0x1f);
1239         } else {
1240             tcg_out_opc_sll_w(s, a0, a1, a2);
1241         }
1242         break;
1243     case INDEX_op_shl_i64:
1244         if (c2) {
1245             tcg_out_opc_slli_d(s, a0, a1, a2 & 0x3f);
1246         } else {
1247             tcg_out_opc_sll_d(s, a0, a1, a2);
1248         }
1249         break;
1250
1251     case INDEX_op_shr_i32:
1252         if (c2) {
1253             tcg_out_opc_srli_w(s, a0, a1, a2 & 0x1f);
1254         } else {
1255             tcg_out_opc_srl_w(s, a0, a1, a2);
1256         }
1257         break;
1258     case INDEX_op_shr_i64:
1259         if (c2) {
1260             tcg_out_opc_srli_d(s, a0, a1, a2 & 0x3f);
1261         } else {
1262             tcg_out_opc_srl_d(s, a0, a1, a2);
1263         }
1264         break;
1265
1266     case INDEX_op_sar_i32:
1267         if (c2) {
1268             tcg_out_opc_srai_w(s, a0, a1, a2 & 0x1f);
1269         } else {
1270             tcg_out_opc_sra_w(s, a0, a1, a2);
1271         }
1272         break;
1273     case INDEX_op_sar_i64:
1274         if (c2) {
1275             tcg_out_opc_srai_d(s, a0, a1, a2 & 0x3f);
1276         } else {
1277             tcg_out_opc_sra_d(s, a0, a1, a2);
1278         }
1279         break;
1280
1281     case INDEX_op_rotl_i32:
1282         /* transform into equivalent rotr/rotri */
1283         if (c2) {
1284             tcg_out_opc_rotri_w(s, a0, a1, (32 - a2) & 0x1f);
1285         } else {
1286             tcg_out_opc_sub_w(s, TCG_REG_TMP0, TCG_REG_ZERO, a2);
1287             tcg_out_opc_rotr_w(s, a0, a1, TCG_REG_TMP0);
1288         }
1289         break;
1290     case INDEX_op_rotl_i64:
1291         /* transform into equivalent rotr/rotri */
1292         if (c2) {
1293             tcg_out_opc_rotri_d(s, a0, a1, (64 - a2) & 0x3f);
1294         } else {
1295             tcg_out_opc_sub_w(s, TCG_REG_TMP0, TCG_REG_ZERO, a2);
1296             tcg_out_opc_rotr_d(s, a0, a1, TCG_REG_TMP0);
1297         }
1298         break;
1299
1300     case INDEX_op_rotr_i32:
1301         if (c2) {
1302             tcg_out_opc_rotri_w(s, a0, a1, a2 & 0x1f);
1303         } else {
1304             tcg_out_opc_rotr_w(s, a0, a1, a2);
1305         }
1306         break;
1307     case INDEX_op_rotr_i64:
1308         if (c2) {
1309             tcg_out_opc_rotri_d(s, a0, a1, a2 & 0x3f);
1310         } else {
1311             tcg_out_opc_rotr_d(s, a0, a1, a2);
1312         }
1313         break;
1314
1315     case INDEX_op_add_i32:
1316         if (c2) {
1317             tcg_out_addi(s, TCG_TYPE_I32, a0, a1, a2);
1318         } else {
1319             tcg_out_opc_add_w(s, a0, a1, a2);
1320         }
1321         break;
1322     case INDEX_op_add_i64:
1323         if (c2) {
1324             tcg_out_addi(s, TCG_TYPE_I64, a0, a1, a2);
1325         } else {
1326             tcg_out_opc_add_d(s, a0, a1, a2);
1327         }
1328         break;
1329
1330     case INDEX_op_sub_i32:
1331         if (c2) {
1332             tcg_out_addi(s, TCG_TYPE_I32, a0, a1, -a2);
1333         } else {
1334             tcg_out_opc_sub_w(s, a0, a1, a2);
1335         }
1336         break;
1337     case INDEX_op_sub_i64:
1338         if (c2) {
1339             tcg_out_addi(s, TCG_TYPE_I64, a0, a1, -a2);
1340         } else {
1341             tcg_out_opc_sub_d(s, a0, a1, a2);
1342         }
1343         break;
1344
1345     case INDEX_op_mul_i32:
1346         tcg_out_opc_mul_w(s, a0, a1, a2);
1347         break;
1348     case INDEX_op_mul_i64:
1349         tcg_out_opc_mul_d(s, a0, a1, a2);
1350         break;
1351
1352     case INDEX_op_mulsh_i32:
1353         tcg_out_opc_mulh_w(s, a0, a1, a2);
1354         break;
1355     case INDEX_op_mulsh_i64:
1356         tcg_out_opc_mulh_d(s, a0, a1, a2);
1357         break;
1358
1359     case INDEX_op_muluh_i32:
1360         tcg_out_opc_mulh_wu(s, a0, a1, a2);
1361         break;
1362     case INDEX_op_muluh_i64:
1363         tcg_out_opc_mulh_du(s, a0, a1, a2);
1364         break;
1365
1366     case INDEX_op_div_i32:
1367         tcg_out_opc_div_w(s, a0, a1, a2);
1368         break;
1369     case INDEX_op_div_i64:
1370         tcg_out_opc_div_d(s, a0, a1, a2);
1371         break;
1372
1373     case INDEX_op_divu_i32:
1374         tcg_out_opc_div_wu(s, a0, a1, a2);
1375         break;
1376     case INDEX_op_divu_i64:
1377         tcg_out_opc_div_du(s, a0, a1, a2);
1378         break;
1379
1380     case INDEX_op_rem_i32:
1381         tcg_out_opc_mod_w(s, a0, a1, a2);
1382         break;
1383     case INDEX_op_rem_i64:
1384         tcg_out_opc_mod_d(s, a0, a1, a2);
1385         break;
1386
1387     case INDEX_op_remu_i32:
1388         tcg_out_opc_mod_wu(s, a0, a1, a2);
1389         break;
1390     case INDEX_op_remu_i64:
1391         tcg_out_opc_mod_du(s, a0, a1, a2);
1392         break;
1393
1394     case INDEX_op_setcond_i32:
1395     case INDEX_op_setcond_i64:
1396         tcg_out_setcond(s, args[3], a0, a1, a2, c2);
1397         break;
1398
1399     case INDEX_op_movcond_i32:
1400     case INDEX_op_movcond_i64:
1401         tcg_out_movcond(s, args[5], a0, a1, a2, c2, args[3], args[4]);
1402         break;
1403
1404     case INDEX_op_ld8s_i32:
1405     case INDEX_op_ld8s_i64:
1406         tcg_out_ldst(s, OPC_LD_B, a0, a1, a2);
1407         break;
1408     case INDEX_op_ld8u_i32:
1409     case INDEX_op_ld8u_i64:
1410         tcg_out_ldst(s, OPC_LD_BU, a0, a1, a2);
1411         break;
1412     case INDEX_op_ld16s_i32:
1413     case INDEX_op_ld16s_i64:
1414         tcg_out_ldst(s, OPC_LD_H, a0, a1, a2);
1415         break;
1416     case INDEX_op_ld16u_i32:
1417     case INDEX_op_ld16u_i64:
1418         tcg_out_ldst(s, OPC_LD_HU, a0, a1, a2);
1419         break;
1420     case INDEX_op_ld_i32:
1421     case INDEX_op_ld32s_i64:
1422         tcg_out_ldst(s, OPC_LD_W, a0, a1, a2);
1423         break;
1424     case INDEX_op_ld32u_i64:
1425         tcg_out_ldst(s, OPC_LD_WU, a0, a1, a2);
1426         break;
1427     case INDEX_op_ld_i64:
1428         tcg_out_ldst(s, OPC_LD_D, a0, a1, a2);
1429         break;
1430
1431     case INDEX_op_st8_i32:
1432     case INDEX_op_st8_i64:
1433         tcg_out_ldst(s, OPC_ST_B, a0, a1, a2);
1434         break;
1435     case INDEX_op_st16_i32:
1436     case INDEX_op_st16_i64:
1437         tcg_out_ldst(s, OPC_ST_H, a0, a1, a2);
1438         break;
1439     case INDEX_op_st_i32:
1440     case INDEX_op_st32_i64:
1441         tcg_out_ldst(s, OPC_ST_W, a0, a1, a2);
1442         break;
1443     case INDEX_op_st_i64:
1444         tcg_out_ldst(s, OPC_ST_D, a0, a1, a2);
1445         break;
1446
1447     case INDEX_op_qemu_ld_a32_i32:
1448     case INDEX_op_qemu_ld_a64_i32:
1449         tcg_out_qemu_ld(s, a0, a1, a2, TCG_TYPE_I32);
1450         break;
1451     case INDEX_op_qemu_ld_a32_i64:
1452     case INDEX_op_qemu_ld_a64_i64:
1453         tcg_out_qemu_ld(s, a0, a1, a2, TCG_TYPE_I64);
1454         break;
1455     case INDEX_op_qemu_st_a32_i32:
1456     case INDEX_op_qemu_st_a64_i32:
1457         tcg_out_qemu_st(s, a0, a1, a2, TCG_TYPE_I32);
1458         break;
1459     case INDEX_op_qemu_st_a32_i64:
1460     case INDEX_op_qemu_st_a64_i64:
1461         tcg_out_qemu_st(s, a0, a1, a2, TCG_TYPE_I64);
1462         break;
1463
1464     case INDEX_op_mov_i32:  /* Always emitted via tcg_out_mov.  */
1465     case INDEX_op_mov_i64:
1466     case INDEX_op_call:     /* Always emitted via tcg_out_call.  */
1467     case INDEX_op_exit_tb:  /* Always emitted via tcg_out_exit_tb.  */
1468     case INDEX_op_goto_tb:  /* Always emitted via tcg_out_goto_tb.  */
1469     case INDEX_op_ext8s_i32:  /* Always emitted via tcg_reg_alloc_op.  */
1470     case INDEX_op_ext8s_i64:
1471     case INDEX_op_ext8u_i32:
1472     case INDEX_op_ext8u_i64:
1473     case INDEX_op_ext16s_i32:
1474     case INDEX_op_ext16s_i64:
1475     case INDEX_op_ext16u_i32:
1476     case INDEX_op_ext16u_i64:
1477     case INDEX_op_ext32s_i64:
1478     case INDEX_op_ext32u_i64:
1479     case INDEX_op_ext_i32_i64:
1480     case INDEX_op_extu_i32_i64:
1481     case INDEX_op_extrl_i64_i32:
1482     default:
1483         g_assert_not_reached();
1484     }
1485 }
1486
1487 static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
1488 {
1489     switch (op) {
1490     case INDEX_op_goto_ptr:
1491         return C_O0_I1(r);
1492
1493     case INDEX_op_st8_i32:
1494     case INDEX_op_st8_i64:
1495     case INDEX_op_st16_i32:
1496     case INDEX_op_st16_i64:
1497     case INDEX_op_st32_i64:
1498     case INDEX_op_st_i32:
1499     case INDEX_op_st_i64:
1500     case INDEX_op_qemu_st_a32_i32:
1501     case INDEX_op_qemu_st_a64_i32:
1502     case INDEX_op_qemu_st_a32_i64:
1503     case INDEX_op_qemu_st_a64_i64:
1504         return C_O0_I2(rZ, r);
1505
1506     case INDEX_op_brcond_i32:
1507     case INDEX_op_brcond_i64:
1508         return C_O0_I2(rZ, rZ);
1509
1510     case INDEX_op_ext8s_i32:
1511     case INDEX_op_ext8s_i64:
1512     case INDEX_op_ext8u_i32:
1513     case INDEX_op_ext8u_i64:
1514     case INDEX_op_ext16s_i32:
1515     case INDEX_op_ext16s_i64:
1516     case INDEX_op_ext16u_i32:
1517     case INDEX_op_ext16u_i64:
1518     case INDEX_op_ext32s_i64:
1519     case INDEX_op_ext32u_i64:
1520     case INDEX_op_extu_i32_i64:
1521     case INDEX_op_extrl_i64_i32:
1522     case INDEX_op_extrh_i64_i32:
1523     case INDEX_op_ext_i32_i64:
1524     case INDEX_op_not_i32:
1525     case INDEX_op_not_i64:
1526     case INDEX_op_extract_i32:
1527     case INDEX_op_extract_i64:
1528     case INDEX_op_bswap16_i32:
1529     case INDEX_op_bswap16_i64:
1530     case INDEX_op_bswap32_i32:
1531     case INDEX_op_bswap32_i64:
1532     case INDEX_op_bswap64_i64:
1533     case INDEX_op_ld8s_i32:
1534     case INDEX_op_ld8s_i64:
1535     case INDEX_op_ld8u_i32:
1536     case INDEX_op_ld8u_i64:
1537     case INDEX_op_ld16s_i32:
1538     case INDEX_op_ld16s_i64:
1539     case INDEX_op_ld16u_i32:
1540     case INDEX_op_ld16u_i64:
1541     case INDEX_op_ld32s_i64:
1542     case INDEX_op_ld32u_i64:
1543     case INDEX_op_ld_i32:
1544     case INDEX_op_ld_i64:
1545     case INDEX_op_qemu_ld_a32_i32:
1546     case INDEX_op_qemu_ld_a64_i32:
1547     case INDEX_op_qemu_ld_a32_i64:
1548     case INDEX_op_qemu_ld_a64_i64:
1549         return C_O1_I1(r, r);
1550
1551     case INDEX_op_andc_i32:
1552     case INDEX_op_andc_i64:
1553     case INDEX_op_orc_i32:
1554     case INDEX_op_orc_i64:
1555         /*
1556          * LoongArch insns for these ops don't have reg-imm forms, but we
1557          * can express using andi/ori if ~constant satisfies
1558          * TCG_CT_CONST_U12.
1559          */
1560         return C_O1_I2(r, r, rC);
1561
1562     case INDEX_op_shl_i32:
1563     case INDEX_op_shl_i64:
1564     case INDEX_op_shr_i32:
1565     case INDEX_op_shr_i64:
1566     case INDEX_op_sar_i32:
1567     case INDEX_op_sar_i64:
1568     case INDEX_op_rotl_i32:
1569     case INDEX_op_rotl_i64:
1570     case INDEX_op_rotr_i32:
1571     case INDEX_op_rotr_i64:
1572         return C_O1_I2(r, r, ri);
1573
1574     case INDEX_op_add_i32:
1575         return C_O1_I2(r, r, ri);
1576     case INDEX_op_add_i64:
1577         return C_O1_I2(r, r, rJ);
1578
1579     case INDEX_op_and_i32:
1580     case INDEX_op_and_i64:
1581     case INDEX_op_nor_i32:
1582     case INDEX_op_nor_i64:
1583     case INDEX_op_or_i32:
1584     case INDEX_op_or_i64:
1585     case INDEX_op_xor_i32:
1586     case INDEX_op_xor_i64:
1587         /* LoongArch reg-imm bitops have their imms ZERO-extended */
1588         return C_O1_I2(r, r, rU);
1589
1590     case INDEX_op_clz_i32:
1591     case INDEX_op_clz_i64:
1592     case INDEX_op_ctz_i32:
1593     case INDEX_op_ctz_i64:
1594         return C_O1_I2(r, r, rW);
1595
1596     case INDEX_op_deposit_i32:
1597     case INDEX_op_deposit_i64:
1598         /* Must deposit into the same register as input */
1599         return C_O1_I2(r, 0, rZ);
1600
1601     case INDEX_op_sub_i32:
1602     case INDEX_op_setcond_i32:
1603         return C_O1_I2(r, rZ, ri);
1604     case INDEX_op_sub_i64:
1605     case INDEX_op_setcond_i64:
1606         return C_O1_I2(r, rZ, rJ);
1607
1608     case INDEX_op_mul_i32:
1609     case INDEX_op_mul_i64:
1610     case INDEX_op_mulsh_i32:
1611     case INDEX_op_mulsh_i64:
1612     case INDEX_op_muluh_i32:
1613     case INDEX_op_muluh_i64:
1614     case INDEX_op_div_i32:
1615     case INDEX_op_div_i64:
1616     case INDEX_op_divu_i32:
1617     case INDEX_op_divu_i64:
1618     case INDEX_op_rem_i32:
1619     case INDEX_op_rem_i64:
1620     case INDEX_op_remu_i32:
1621     case INDEX_op_remu_i64:
1622         return C_O1_I2(r, rZ, rZ);
1623
1624     case INDEX_op_movcond_i32:
1625     case INDEX_op_movcond_i64:
1626         return C_O1_I4(r, rZ, rJ, rZ, rZ);
1627
1628     default:
1629         g_assert_not_reached();
1630     }
1631 }
1632
1633 static const int tcg_target_callee_save_regs[] = {
1634     TCG_REG_S0,     /* used for the global env (TCG_AREG0) */
1635     TCG_REG_S1,
1636     TCG_REG_S2,
1637     TCG_REG_S3,
1638     TCG_REG_S4,
1639     TCG_REG_S5,
1640     TCG_REG_S6,
1641     TCG_REG_S7,
1642     TCG_REG_S8,
1643     TCG_REG_S9,
1644     TCG_REG_RA,     /* should be last for ABI compliance */
1645 };
1646
1647 /* Stack frame parameters.  */
1648 #define REG_SIZE   (TCG_TARGET_REG_BITS / 8)
1649 #define SAVE_SIZE  ((int)ARRAY_SIZE(tcg_target_callee_save_regs) * REG_SIZE)
1650 #define TEMP_SIZE  (CPU_TEMP_BUF_NLONGS * (int)sizeof(long))
1651 #define FRAME_SIZE ((TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE + SAVE_SIZE \
1652                      + TCG_TARGET_STACK_ALIGN - 1) \
1653                     & -TCG_TARGET_STACK_ALIGN)
1654 #define SAVE_OFS   (TCG_STATIC_CALL_ARGS_SIZE + TEMP_SIZE)
1655
1656 /* We're expecting to be able to use an immediate for frame allocation.  */
1657 QEMU_BUILD_BUG_ON(FRAME_SIZE > 0x7ff);
1658
1659 /* Generate global QEMU prologue and epilogue code */
1660 static void tcg_target_qemu_prologue(TCGContext *s)
1661 {
1662     int i;
1663
1664     tcg_set_frame(s, TCG_REG_SP, TCG_STATIC_CALL_ARGS_SIZE, TEMP_SIZE);
1665
1666     /* TB prologue */
1667     tcg_out_opc_addi_d(s, TCG_REG_SP, TCG_REG_SP, -FRAME_SIZE);
1668     for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
1669         tcg_out_st(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
1670                    TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
1671     }
1672
1673 #if !defined(CONFIG_SOFTMMU)
1674     if (USE_GUEST_BASE) {
1675         tcg_out_movi(s, TCG_TYPE_PTR, TCG_GUEST_BASE_REG, guest_base);
1676         tcg_regset_set_reg(s->reserved_regs, TCG_GUEST_BASE_REG);
1677     }
1678 #endif
1679
1680     /* Call generated code */
1681     tcg_out_mov(s, TCG_TYPE_PTR, TCG_AREG0, tcg_target_call_iarg_regs[0]);
1682     tcg_out_opc_jirl(s, TCG_REG_ZERO, tcg_target_call_iarg_regs[1], 0);
1683
1684     /* Return path for goto_ptr. Set return value to 0 */
1685     tcg_code_gen_epilogue = tcg_splitwx_to_rx(s->code_ptr);
1686     tcg_out_mov(s, TCG_TYPE_REG, TCG_REG_A0, TCG_REG_ZERO);
1687
1688     /* TB epilogue */
1689     tb_ret_addr = tcg_splitwx_to_rx(s->code_ptr);
1690     for (i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
1691         tcg_out_ld(s, TCG_TYPE_REG, tcg_target_callee_save_regs[i],
1692                    TCG_REG_SP, SAVE_OFS + i * REG_SIZE);
1693     }
1694
1695     tcg_out_opc_addi_d(s, TCG_REG_SP, TCG_REG_SP, FRAME_SIZE);
1696     tcg_out_opc_jirl(s, TCG_REG_ZERO, TCG_REG_RA, 0);
1697 }
1698
1699 static void tcg_target_init(TCGContext *s)
1700 {
1701     unsigned long hwcap = qemu_getauxval(AT_HWCAP);
1702
1703     /* Server and desktop class cpus have UAL; embedded cpus do not. */
1704     if (!(hwcap & HWCAP_LOONGARCH_UAL)) {
1705         error_report("TCG: unaligned access support required; exiting");
1706         exit(EXIT_FAILURE);
1707     }
1708
1709     tcg_target_available_regs[TCG_TYPE_I32] = ALL_GENERAL_REGS;
1710     tcg_target_available_regs[TCG_TYPE_I64] = ALL_GENERAL_REGS;
1711
1712     tcg_target_call_clobber_regs = ALL_GENERAL_REGS;
1713     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S0);
1714     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S1);
1715     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S2);
1716     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S3);
1717     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S4);
1718     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S5);
1719     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S6);
1720     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S7);
1721     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S8);
1722     tcg_regset_reset_reg(tcg_target_call_clobber_regs, TCG_REG_S9);
1723
1724     s->reserved_regs = 0;
1725     tcg_regset_set_reg(s->reserved_regs, TCG_REG_ZERO);
1726     tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP0);
1727     tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP1);
1728     tcg_regset_set_reg(s->reserved_regs, TCG_REG_TMP2);
1729     tcg_regset_set_reg(s->reserved_regs, TCG_REG_SP);
1730     tcg_regset_set_reg(s->reserved_regs, TCG_REG_TP);
1731     tcg_regset_set_reg(s->reserved_regs, TCG_REG_RESERVED);
1732 }
1733
1734 typedef struct {
1735     DebugFrameHeader h;
1736     uint8_t fde_def_cfa[4];
1737     uint8_t fde_reg_ofs[ARRAY_SIZE(tcg_target_callee_save_regs) * 2];
1738 } DebugFrame;
1739
1740 #define ELF_HOST_MACHINE EM_LOONGARCH
1741
1742 static const DebugFrame debug_frame = {
1743     .h.cie.len = sizeof(DebugFrameCIE) - 4, /* length after .len member */
1744     .h.cie.id = -1,
1745     .h.cie.version = 1,
1746     .h.cie.code_align = 1,
1747     .h.cie.data_align = -(TCG_TARGET_REG_BITS / 8) & 0x7f, /* sleb128 */
1748     .h.cie.return_column = TCG_REG_RA,
1749
1750     /* Total FDE size does not include the "len" member.  */
1751     .h.fde.len = sizeof(DebugFrame) - offsetof(DebugFrame, h.fde.cie_offset),
1752
1753     .fde_def_cfa = {
1754         12, TCG_REG_SP,                 /* DW_CFA_def_cfa sp, ...  */
1755         (FRAME_SIZE & 0x7f) | 0x80,     /* ... uleb128 FRAME_SIZE */
1756         (FRAME_SIZE >> 7)
1757     },
1758     .fde_reg_ofs = {
1759         0x80 + 23, 11,                  /* DW_CFA_offset, s0, -88 */
1760         0x80 + 24, 10,                  /* DW_CFA_offset, s1, -80 */
1761         0x80 + 25, 9,                   /* DW_CFA_offset, s2, -72 */
1762         0x80 + 26, 8,                   /* DW_CFA_offset, s3, -64 */
1763         0x80 + 27, 7,                   /* DW_CFA_offset, s4, -56 */
1764         0x80 + 28, 6,                   /* DW_CFA_offset, s5, -48 */
1765         0x80 + 29, 5,                   /* DW_CFA_offset, s6, -40 */
1766         0x80 + 30, 4,                   /* DW_CFA_offset, s7, -32 */
1767         0x80 + 31, 3,                   /* DW_CFA_offset, s8, -24 */
1768         0x80 + 22, 2,                   /* DW_CFA_offset, s9, -16 */
1769         0x80 + 1 , 1,                   /* DW_CFA_offset, ra, -8 */
1770     }
1771 };
1772
1773 void tcg_register_jit(const void *buf, size_t buf_size)
1774 {
1775     tcg_register_jit_int(buf, buf_size, &debug_frame, sizeof(debug_frame));
1776 }