1 2 /*---------------------------------------------------------------*/ 3 /*--- begin guest_x86_helpers.c ---*/ 4 /*---------------------------------------------------------------*/ 5 6 /* 7 This file is part of Valgrind, a dynamic binary instrumentation 8 framework. 9 10 Copyright (C) 2004-2010 OpenWorks LLP 11 info (at) open-works.net 12 13 This program is free software; you can redistribute it and/or 14 modify it under the terms of the GNU General Public License as 15 published by the Free Software Foundation; either version 2 of the 16 License, or (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, but 19 WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 26 02110-1301, USA. 27 28 The GNU General Public License is contained in the file COPYING. 29 30 Neither the names of the U.S. Department of Energy nor the 31 University of California nor the names of its contributors may be 32 used to endorse or promote products derived from this software 33 without prior written permission. 34 */ 35 36 #include "libvex_basictypes.h" 37 #include "libvex_emwarn.h" 38 #include "libvex_guest_x86.h" 39 #include "libvex_ir.h" 40 #include "libvex.h" 41 42 #include "main_util.h" 43 #include "guest_generic_bb_to_IR.h" 44 #include "guest_x86_defs.h" 45 #include "guest_generic_x87.h" 46 47 48 /* This file contains helper functions for x86 guest code. 49 Calls to these functions are generated by the back end. 50 These calls are of course in the host machine code and 51 this file will be compiled to host machine code, so that 52 all makes sense. 53 54 Only change the signatures of these helper functions very 55 carefully. If you change the signature here, you'll have to change 56 the parameters passed to it in the IR calls constructed by 57 guest-x86/toIR.c. 58 59 The convention used is that all functions called from generated 60 code are named x86g_<something>, and any function whose name lacks 61 that prefix is not called from generated code. Note that some 62 LibVEX_* functions can however be called by VEX's client, but that 63 is not the same as calling them from VEX-generated code. 64 */ 65 66 67 /* Set to 1 to get detailed profiling info about use of the flag 68 machinery. */ 69 #define PROFILE_EFLAGS 0 70 71 72 /*---------------------------------------------------------------*/ 73 /*--- %eflags run-time helpers. ---*/ 74 /*---------------------------------------------------------------*/ 75 76 static const UChar parity_table[256] = { 77 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 78 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 79 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 80 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 81 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 82 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 83 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 84 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 85 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 86 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 87 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 88 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 89 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 90 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 91 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 92 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 93 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 94 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 95 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 96 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 97 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 98 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 99 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 100 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 101 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 102 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 103 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 104 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 105 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 106 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 107 X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, 108 0, X86G_CC_MASK_P, X86G_CC_MASK_P, 0, X86G_CC_MASK_P, 0, 0, X86G_CC_MASK_P, 109 }; 110 111 /* generalised left-shifter */ 112 inline static Int lshift ( Int x, Int n ) 113 { 114 if (n >= 0) 115 return x << n; 116 else 117 return x >> (-n); 118 } 119 120 /* identity on ULong */ 121 static inline ULong idULong ( ULong x ) 122 { 123 return x; 124 } 125 126 127 #define PREAMBLE(__data_bits) \ 128 /* const */ UInt DATA_MASK \ 129 = __data_bits==8 ? 0xFF \ 130 : (__data_bits==16 ? 0xFFFF \ 131 : 0xFFFFFFFF); \ 132 /* const */ UInt SIGN_MASK = 1 << (__data_bits - 1); \ 133 /* const */ UInt CC_DEP1 = cc_dep1_formal; \ 134 /* const */ UInt CC_DEP2 = cc_dep2_formal; \ 135 /* const */ UInt CC_NDEP = cc_ndep_formal; \ 136 /* Four bogus assignments, which hopefully gcc can */ \ 137 /* optimise away, and which stop it complaining about */ \ 138 /* unused variables. */ \ 139 SIGN_MASK = SIGN_MASK; \ 140 DATA_MASK = DATA_MASK; \ 141 CC_DEP2 = CC_DEP2; \ 142 CC_NDEP = CC_NDEP; 143 144 145 /*-------------------------------------------------------------*/ 146 147 #define ACTIONS_ADD(DATA_BITS,DATA_UTYPE) \ 148 { \ 149 PREAMBLE(DATA_BITS); \ 150 { Int cf, pf, af, zf, sf, of; \ 151 Int argL, argR, res; \ 152 argL = CC_DEP1; \ 153 argR = CC_DEP2; \ 154 res = argL + argR; \ 155 cf = (DATA_UTYPE)res < (DATA_UTYPE)argL; \ 156 pf = parity_table[(UChar)res]; \ 157 af = (res ^ argL ^ argR) & 0x10; \ 158 zf = ((DATA_UTYPE)res == 0) << 6; \ 159 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 160 of = lshift((argL ^ argR ^ -1) & (argL ^ res), \ 161 12 - DATA_BITS) & X86G_CC_MASK_O; \ 162 return cf | pf | af | zf | sf | of; \ 163 } \ 164 } 165 166 /*-------------------------------------------------------------*/ 167 168 #define ACTIONS_SUB(DATA_BITS,DATA_UTYPE) \ 169 { \ 170 PREAMBLE(DATA_BITS); \ 171 { Int cf, pf, af, zf, sf, of; \ 172 Int argL, argR, res; \ 173 argL = CC_DEP1; \ 174 argR = CC_DEP2; \ 175 res = argL - argR; \ 176 cf = (DATA_UTYPE)argL < (DATA_UTYPE)argR; \ 177 pf = parity_table[(UChar)res]; \ 178 af = (res ^ argL ^ argR) & 0x10; \ 179 zf = ((DATA_UTYPE)res == 0) << 6; \ 180 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 181 of = lshift((argL ^ argR) & (argL ^ res), \ 182 12 - DATA_BITS) & X86G_CC_MASK_O; \ 183 return cf | pf | af | zf | sf | of; \ 184 } \ 185 } 186 187 /*-------------------------------------------------------------*/ 188 189 #define ACTIONS_ADC(DATA_BITS,DATA_UTYPE) \ 190 { \ 191 PREAMBLE(DATA_BITS); \ 192 { Int cf, pf, af, zf, sf, of; \ 193 Int argL, argR, oldC, res; \ 194 oldC = CC_NDEP & X86G_CC_MASK_C; \ 195 argL = CC_DEP1; \ 196 argR = CC_DEP2 ^ oldC; \ 197 res = (argL + argR) + oldC; \ 198 if (oldC) \ 199 cf = (DATA_UTYPE)res <= (DATA_UTYPE)argL; \ 200 else \ 201 cf = (DATA_UTYPE)res < (DATA_UTYPE)argL; \ 202 pf = parity_table[(UChar)res]; \ 203 af = (res ^ argL ^ argR) & 0x10; \ 204 zf = ((DATA_UTYPE)res == 0) << 6; \ 205 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 206 of = lshift((argL ^ argR ^ -1) & (argL ^ res), \ 207 12 - DATA_BITS) & X86G_CC_MASK_O; \ 208 return cf | pf | af | zf | sf | of; \ 209 } \ 210 } 211 212 /*-------------------------------------------------------------*/ 213 214 #define ACTIONS_SBB(DATA_BITS,DATA_UTYPE) \ 215 { \ 216 PREAMBLE(DATA_BITS); \ 217 { Int cf, pf, af, zf, sf, of; \ 218 Int argL, argR, oldC, res; \ 219 oldC = CC_NDEP & X86G_CC_MASK_C; \ 220 argL = CC_DEP1; \ 221 argR = CC_DEP2 ^ oldC; \ 222 res = (argL - argR) - oldC; \ 223 if (oldC) \ 224 cf = (DATA_UTYPE)argL <= (DATA_UTYPE)argR; \ 225 else \ 226 cf = (DATA_UTYPE)argL < (DATA_UTYPE)argR; \ 227 pf = parity_table[(UChar)res]; \ 228 af = (res ^ argL ^ argR) & 0x10; \ 229 zf = ((DATA_UTYPE)res == 0) << 6; \ 230 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 231 of = lshift((argL ^ argR) & (argL ^ res), \ 232 12 - DATA_BITS) & X86G_CC_MASK_O; \ 233 return cf | pf | af | zf | sf | of; \ 234 } \ 235 } 236 237 /*-------------------------------------------------------------*/ 238 239 #define ACTIONS_LOGIC(DATA_BITS,DATA_UTYPE) \ 240 { \ 241 PREAMBLE(DATA_BITS); \ 242 { Int cf, pf, af, zf, sf, of; \ 243 cf = 0; \ 244 pf = parity_table[(UChar)CC_DEP1]; \ 245 af = 0; \ 246 zf = ((DATA_UTYPE)CC_DEP1 == 0) << 6; \ 247 sf = lshift(CC_DEP1, 8 - DATA_BITS) & 0x80; \ 248 of = 0; \ 249 return cf | pf | af | zf | sf | of; \ 250 } \ 251 } 252 253 /*-------------------------------------------------------------*/ 254 255 #define ACTIONS_INC(DATA_BITS,DATA_UTYPE) \ 256 { \ 257 PREAMBLE(DATA_BITS); \ 258 { Int cf, pf, af, zf, sf, of; \ 259 Int argL, argR, res; \ 260 res = CC_DEP1; \ 261 argL = res - 1; \ 262 argR = 1; \ 263 cf = CC_NDEP & X86G_CC_MASK_C; \ 264 pf = parity_table[(UChar)res]; \ 265 af = (res ^ argL ^ argR) & 0x10; \ 266 zf = ((DATA_UTYPE)res == 0) << 6; \ 267 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 268 of = ((res & DATA_MASK) == SIGN_MASK) << 11; \ 269 return cf | pf | af | zf | sf | of; \ 270 } \ 271 } 272 273 /*-------------------------------------------------------------*/ 274 275 #define ACTIONS_DEC(DATA_BITS,DATA_UTYPE) \ 276 { \ 277 PREAMBLE(DATA_BITS); \ 278 { Int cf, pf, af, zf, sf, of; \ 279 Int argL, argR, res; \ 280 res = CC_DEP1; \ 281 argL = res + 1; \ 282 argR = 1; \ 283 cf = CC_NDEP & X86G_CC_MASK_C; \ 284 pf = parity_table[(UChar)res]; \ 285 af = (res ^ argL ^ argR) & 0x10; \ 286 zf = ((DATA_UTYPE)res == 0) << 6; \ 287 sf = lshift(res, 8 - DATA_BITS) & 0x80; \ 288 of = ((res & DATA_MASK) \ 289 == ((UInt)SIGN_MASK - 1)) << 11; \ 290 return cf | pf | af | zf | sf | of; \ 291 } \ 292 } 293 294 /*-------------------------------------------------------------*/ 295 296 #define ACTIONS_SHL(DATA_BITS,DATA_UTYPE) \ 297 { \ 298 PREAMBLE(DATA_BITS); \ 299 { Int cf, pf, af, zf, sf, of; \ 300 cf = (CC_DEP2 >> (DATA_BITS - 1)) & X86G_CC_MASK_C; \ 301 pf = parity_table[(UChar)CC_DEP1]; \ 302 af = 0; /* undefined */ \ 303 zf = ((DATA_UTYPE)CC_DEP1 == 0) << 6; \ 304 sf = lshift(CC_DEP1, 8 - DATA_BITS) & 0x80; \ 305 /* of is defined if shift count == 1 */ \ 306 of = lshift(CC_DEP2 ^ CC_DEP1, 12 - DATA_BITS) \ 307 & X86G_CC_MASK_O; \ 308 return cf | pf | af | zf | sf | of; \ 309 } \ 310 } 311 312 /*-------------------------------------------------------------*/ 313 314 #define ACTIONS_SHR(DATA_BITS,DATA_UTYPE) \ 315 { \ 316 PREAMBLE(DATA_BITS); \ 317 { Int cf, pf, af, zf, sf, of; \ 318 cf = CC_DEP2 & 1; \ 319 pf = parity_table[(UChar)CC_DEP1]; \ 320 af = 0; /* undefined */ \ 321 zf = ((DATA_UTYPE)CC_DEP1 == 0) << 6; \ 322 sf = lshift(CC_DEP1, 8 - DATA_BITS) & 0x80; \ 323 /* of is defined if shift count == 1 */ \ 324 of = lshift(CC_DEP2 ^ CC_DEP1, 12 - DATA_BITS) \ 325 & X86G_CC_MASK_O; \ 326 return cf | pf | af | zf | sf | of; \ 327 } \ 328 } 329 330 /*-------------------------------------------------------------*/ 331 332 /* ROL: cf' = lsb(result). of' = msb(result) ^ lsb(result). */ 333 /* DEP1 = result, NDEP = old flags */ 334 #define ACTIONS_ROL(DATA_BITS,DATA_UTYPE) \ 335 { \ 336 PREAMBLE(DATA_BITS); \ 337 { Int fl \ 338 = (CC_NDEP & ~(X86G_CC_MASK_O | X86G_CC_MASK_C)) \ 339 | (X86G_CC_MASK_C & CC_DEP1) \ 340 | (X86G_CC_MASK_O & (lshift(CC_DEP1, \ 341 11-(DATA_BITS-1)) \ 342 ^ lshift(CC_DEP1, 11))); \ 343 return fl; \ 344 } \ 345 } 346 347 /*-------------------------------------------------------------*/ 348 349 /* ROR: cf' = msb(result). of' = msb(result) ^ msb-1(result). */ 350 /* DEP1 = result, NDEP = old flags */ 351 #define ACTIONS_ROR(DATA_BITS,DATA_UTYPE) \ 352 { \ 353 PREAMBLE(DATA_BITS); \ 354 { Int fl \ 355 = (CC_NDEP & ~(X86G_CC_MASK_O | X86G_CC_MASK_C)) \ 356 | (X86G_CC_MASK_C & (CC_DEP1 >> (DATA_BITS-1))) \ 357 | (X86G_CC_MASK_O & (lshift(CC_DEP1, \ 358 11-(DATA_BITS-1)) \ 359 ^ lshift(CC_DEP1, 11-(DATA_BITS-1)+1))); \ 360 return fl; \ 361 } \ 362 } 363 364 /*-------------------------------------------------------------*/ 365 366 #define ACTIONS_UMUL(DATA_BITS, DATA_UTYPE, NARROWtoU, \ 367 DATA_U2TYPE, NARROWto2U) \ 368 { \ 369 PREAMBLE(DATA_BITS); \ 370 { Int cf, pf, af, zf, sf, of; \ 371 DATA_UTYPE hi; \ 372 DATA_UTYPE lo \ 373 = NARROWtoU( ((DATA_UTYPE)CC_DEP1) \ 374 * ((DATA_UTYPE)CC_DEP2) ); \ 375 DATA_U2TYPE rr \ 376 = NARROWto2U( \ 377 ((DATA_U2TYPE)((DATA_UTYPE)CC_DEP1)) \ 378 * ((DATA_U2TYPE)((DATA_UTYPE)CC_DEP2)) ); \ 379 hi = NARROWtoU(rr >>/*u*/ DATA_BITS); \ 380 cf = (hi != 0); \ 381 pf = parity_table[(UChar)lo]; \ 382 af = 0; /* undefined */ \ 383 zf = (lo == 0) << 6; \ 384 sf = lshift(lo, 8 - DATA_BITS) & 0x80; \ 385 of = cf << 11; \ 386 return cf | pf | af | zf | sf | of; \ 387 } \ 388 } 389 390 /*-------------------------------------------------------------*/ 391 392 #define ACTIONS_SMUL(DATA_BITS, DATA_STYPE, NARROWtoS, \ 393 DATA_S2TYPE, NARROWto2S) \ 394 { \ 395 PREAMBLE(DATA_BITS); \ 396 { Int cf, pf, af, zf, sf, of; \ 397 DATA_STYPE hi; \ 398 DATA_STYPE lo \ 399 = NARROWtoS( ((DATA_STYPE)CC_DEP1) \ 400 * ((DATA_STYPE)CC_DEP2) ); \ 401 DATA_S2TYPE rr \ 402 = NARROWto2S( \ 403 ((DATA_S2TYPE)((DATA_STYPE)CC_DEP1)) \ 404 * ((DATA_S2TYPE)((DATA_STYPE)CC_DEP2)) ); \ 405 hi = NARROWtoS(rr >>/*s*/ DATA_BITS); \ 406 cf = (hi != (lo >>/*s*/ (DATA_BITS-1))); \ 407 pf = parity_table[(UChar)lo]; \ 408 af = 0; /* undefined */ \ 409 zf = (lo == 0) << 6; \ 410 sf = lshift(lo, 8 - DATA_BITS) & 0x80; \ 411 of = cf << 11; \ 412 return cf | pf | af | zf | sf | of; \ 413 } \ 414 } 415 416 417 #if PROFILE_EFLAGS 418 419 static Bool initted = False; 420 421 /* C flag, fast route */ 422 static UInt tabc_fast[X86G_CC_OP_NUMBER]; 423 /* C flag, slow route */ 424 static UInt tabc_slow[X86G_CC_OP_NUMBER]; 425 /* table for calculate_cond */ 426 static UInt tab_cond[X86G_CC_OP_NUMBER][16]; 427 /* total entry counts for calc_all, calc_c, calc_cond. */ 428 static UInt n_calc_all = 0; 429 static UInt n_calc_c = 0; 430 static UInt n_calc_cond = 0; 431 432 #define SHOW_COUNTS_NOW (0 == (0x3FFFFF & (n_calc_all+n_calc_c+n_calc_cond))) 433 434 435 static void showCounts ( void ) 436 { 437 Int op, co; 438 Char ch; 439 vex_printf("\nTotal calls: calc_all=%u calc_cond=%u calc_c=%u\n", 440 n_calc_all, n_calc_cond, n_calc_c); 441 442 vex_printf(" cSLOW cFAST O NO B NB Z NZ BE NBE" 443 " S NS P NP L NL LE NLE\n"); 444 vex_printf(" -----------------------------------------------------" 445 "----------------------------------------\n"); 446 for (op = 0; op < X86G_CC_OP_NUMBER; op++) { 447 448 ch = ' '; 449 if (op > 0 && (op-1) % 3 == 0) 450 ch = 'B'; 451 if (op > 0 && (op-1) % 3 == 1) 452 ch = 'W'; 453 if (op > 0 && (op-1) % 3 == 2) 454 ch = 'L'; 455 456 vex_printf("%2d%c: ", op, ch); 457 vex_printf("%6u ", tabc_slow[op]); 458 vex_printf("%6u ", tabc_fast[op]); 459 for (co = 0; co < 16; co++) { 460 Int n = tab_cond[op][co]; 461 if (n >= 1000) { 462 vex_printf(" %3dK", n / 1000); 463 } else 464 if (n >= 0) { 465 vex_printf(" %3d ", n ); 466 } else { 467 vex_printf(" "); 468 } 469 } 470 vex_printf("\n"); 471 } 472 vex_printf("\n"); 473 } 474 475 static void initCounts ( void ) 476 { 477 Int op, co; 478 initted = True; 479 for (op = 0; op < X86G_CC_OP_NUMBER; op++) { 480 tabc_fast[op] = tabc_slow[op] = 0; 481 for (co = 0; co < 16; co++) 482 tab_cond[op][co] = 0; 483 } 484 } 485 486 #endif /* PROFILE_EFLAGS */ 487 488 489 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 490 /* Calculate all the 6 flags from the supplied thunk parameters. 491 Worker function, not directly called from generated code. */ 492 static 493 UInt x86g_calculate_eflags_all_WRK ( UInt cc_op, 494 UInt cc_dep1_formal, 495 UInt cc_dep2_formal, 496 UInt cc_ndep_formal ) 497 { 498 switch (cc_op) { 499 case X86G_CC_OP_COPY: 500 return cc_dep1_formal 501 & (X86G_CC_MASK_O | X86G_CC_MASK_S | X86G_CC_MASK_Z 502 | X86G_CC_MASK_A | X86G_CC_MASK_C | X86G_CC_MASK_P); 503 504 case X86G_CC_OP_ADDB: ACTIONS_ADD( 8, UChar ); 505 case X86G_CC_OP_ADDW: ACTIONS_ADD( 16, UShort ); 506 case X86G_CC_OP_ADDL: ACTIONS_ADD( 32, UInt ); 507 508 case X86G_CC_OP_ADCB: ACTIONS_ADC( 8, UChar ); 509 case X86G_CC_OP_ADCW: ACTIONS_ADC( 16, UShort ); 510 case X86G_CC_OP_ADCL: ACTIONS_ADC( 32, UInt ); 511 512 case X86G_CC_OP_SUBB: ACTIONS_SUB( 8, UChar ); 513 case X86G_CC_OP_SUBW: ACTIONS_SUB( 16, UShort ); 514 case X86G_CC_OP_SUBL: ACTIONS_SUB( 32, UInt ); 515 516 case X86G_CC_OP_SBBB: ACTIONS_SBB( 8, UChar ); 517 case X86G_CC_OP_SBBW: ACTIONS_SBB( 16, UShort ); 518 case X86G_CC_OP_SBBL: ACTIONS_SBB( 32, UInt ); 519 520 case X86G_CC_OP_LOGICB: ACTIONS_LOGIC( 8, UChar ); 521 case X86G_CC_OP_LOGICW: ACTIONS_LOGIC( 16, UShort ); 522 case X86G_CC_OP_LOGICL: ACTIONS_LOGIC( 32, UInt ); 523 524 case X86G_CC_OP_INCB: ACTIONS_INC( 8, UChar ); 525 case X86G_CC_OP_INCW: ACTIONS_INC( 16, UShort ); 526 case X86G_CC_OP_INCL: ACTIONS_INC( 32, UInt ); 527 528 case X86G_CC_OP_DECB: ACTIONS_DEC( 8, UChar ); 529 case X86G_CC_OP_DECW: ACTIONS_DEC( 16, UShort ); 530 case X86G_CC_OP_DECL: ACTIONS_DEC( 32, UInt ); 531 532 case X86G_CC_OP_SHLB: ACTIONS_SHL( 8, UChar ); 533 case X86G_CC_OP_SHLW: ACTIONS_SHL( 16, UShort ); 534 case X86G_CC_OP_SHLL: ACTIONS_SHL( 32, UInt ); 535 536 case X86G_CC_OP_SHRB: ACTIONS_SHR( 8, UChar ); 537 case X86G_CC_OP_SHRW: ACTIONS_SHR( 16, UShort ); 538 case X86G_CC_OP_SHRL: ACTIONS_SHR( 32, UInt ); 539 540 case X86G_CC_OP_ROLB: ACTIONS_ROL( 8, UChar ); 541 case X86G_CC_OP_ROLW: ACTIONS_ROL( 16, UShort ); 542 case X86G_CC_OP_ROLL: ACTIONS_ROL( 32, UInt ); 543 544 case X86G_CC_OP_RORB: ACTIONS_ROR( 8, UChar ); 545 case X86G_CC_OP_RORW: ACTIONS_ROR( 16, UShort ); 546 case X86G_CC_OP_RORL: ACTIONS_ROR( 32, UInt ); 547 548 case X86G_CC_OP_UMULB: ACTIONS_UMUL( 8, UChar, toUChar, 549 UShort, toUShort ); 550 case X86G_CC_OP_UMULW: ACTIONS_UMUL( 16, UShort, toUShort, 551 UInt, toUInt ); 552 case X86G_CC_OP_UMULL: ACTIONS_UMUL( 32, UInt, toUInt, 553 ULong, idULong ); 554 555 case X86G_CC_OP_SMULB: ACTIONS_SMUL( 8, Char, toUChar, 556 Short, toUShort ); 557 case X86G_CC_OP_SMULW: ACTIONS_SMUL( 16, Short, toUShort, 558 Int, toUInt ); 559 case X86G_CC_OP_SMULL: ACTIONS_SMUL( 32, Int, toUInt, 560 Long, idULong ); 561 562 default: 563 /* shouldn't really make these calls from generated code */ 564 vex_printf("x86g_calculate_eflags_all_WRK(X86)" 565 "( %u, 0x%x, 0x%x, 0x%x )\n", 566 cc_op, cc_dep1_formal, cc_dep2_formal, cc_ndep_formal ); 567 vpanic("x86g_calculate_eflags_all_WRK(X86)"); 568 } 569 } 570 571 572 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 573 /* Calculate all the 6 flags from the supplied thunk parameters. */ 574 UInt x86g_calculate_eflags_all ( UInt cc_op, 575 UInt cc_dep1, 576 UInt cc_dep2, 577 UInt cc_ndep ) 578 { 579 # if PROFILE_EFLAGS 580 if (!initted) initCounts(); 581 n_calc_all++; 582 if (SHOW_COUNTS_NOW) showCounts(); 583 # endif 584 return 585 x86g_calculate_eflags_all_WRK ( cc_op, cc_dep1, cc_dep2, cc_ndep ); 586 } 587 588 589 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 590 /* Calculate just the carry flag from the supplied thunk parameters. */ 591 __attribute((regparm(3))) 592 UInt x86g_calculate_eflags_c ( UInt cc_op, 593 UInt cc_dep1, 594 UInt cc_dep2, 595 UInt cc_ndep ) 596 { 597 # if PROFILE_EFLAGS 598 if (!initted) initCounts(); 599 n_calc_c++; 600 tabc_fast[cc_op]++; 601 if (SHOW_COUNTS_NOW) showCounts(); 602 # endif 603 604 /* Fast-case some common ones. */ 605 switch (cc_op) { 606 case X86G_CC_OP_LOGICL: 607 case X86G_CC_OP_LOGICW: 608 case X86G_CC_OP_LOGICB: 609 return 0; 610 case X86G_CC_OP_SUBL: 611 return ((UInt)cc_dep1) < ((UInt)cc_dep2) 612 ? X86G_CC_MASK_C : 0; 613 case X86G_CC_OP_SUBW: 614 return ((UInt)(cc_dep1 & 0xFFFF)) < ((UInt)(cc_dep2 & 0xFFFF)) 615 ? X86G_CC_MASK_C : 0; 616 case X86G_CC_OP_SUBB: 617 return ((UInt)(cc_dep1 & 0xFF)) < ((UInt)(cc_dep2 & 0xFF)) 618 ? X86G_CC_MASK_C : 0; 619 case X86G_CC_OP_INCL: 620 case X86G_CC_OP_DECL: 621 return cc_ndep & X86G_CC_MASK_C; 622 default: 623 break; 624 } 625 626 # if PROFILE_EFLAGS 627 tabc_fast[cc_op]--; 628 tabc_slow[cc_op]++; 629 # endif 630 631 return x86g_calculate_eflags_all_WRK(cc_op,cc_dep1,cc_dep2,cc_ndep) 632 & X86G_CC_MASK_C; 633 } 634 635 636 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 637 /* returns 1 or 0 */ 638 UInt x86g_calculate_condition ( UInt/*X86Condcode*/ cond, 639 UInt cc_op, 640 UInt cc_dep1, 641 UInt cc_dep2, 642 UInt cc_ndep ) 643 { 644 UInt eflags = x86g_calculate_eflags_all_WRK(cc_op, cc_dep1, 645 cc_dep2, cc_ndep); 646 UInt of,sf,zf,cf,pf; 647 UInt inv = cond & 1; 648 649 # if PROFILE_EFLAGS 650 if (!initted) initCounts(); 651 tab_cond[cc_op][cond]++; 652 n_calc_cond++; 653 if (SHOW_COUNTS_NOW) showCounts(); 654 # endif 655 656 switch (cond) { 657 case X86CondNO: 658 case X86CondO: /* OF == 1 */ 659 of = eflags >> X86G_CC_SHIFT_O; 660 return 1 & (inv ^ of); 661 662 case X86CondNZ: 663 case X86CondZ: /* ZF == 1 */ 664 zf = eflags >> X86G_CC_SHIFT_Z; 665 return 1 & (inv ^ zf); 666 667 case X86CondNB: 668 case X86CondB: /* CF == 1 */ 669 cf = eflags >> X86G_CC_SHIFT_C; 670 return 1 & (inv ^ cf); 671 break; 672 673 case X86CondNBE: 674 case X86CondBE: /* (CF or ZF) == 1 */ 675 cf = eflags >> X86G_CC_SHIFT_C; 676 zf = eflags >> X86G_CC_SHIFT_Z; 677 return 1 & (inv ^ (cf | zf)); 678 break; 679 680 case X86CondNS: 681 case X86CondS: /* SF == 1 */ 682 sf = eflags >> X86G_CC_SHIFT_S; 683 return 1 & (inv ^ sf); 684 685 case X86CondNP: 686 case X86CondP: /* PF == 1 */ 687 pf = eflags >> X86G_CC_SHIFT_P; 688 return 1 & (inv ^ pf); 689 690 case X86CondNL: 691 case X86CondL: /* (SF xor OF) == 1 */ 692 sf = eflags >> X86G_CC_SHIFT_S; 693 of = eflags >> X86G_CC_SHIFT_O; 694 return 1 & (inv ^ (sf ^ of)); 695 break; 696 697 case X86CondNLE: 698 case X86CondLE: /* ((SF xor OF) or ZF) == 1 */ 699 sf = eflags >> X86G_CC_SHIFT_S; 700 of = eflags >> X86G_CC_SHIFT_O; 701 zf = eflags >> X86G_CC_SHIFT_Z; 702 return 1 & (inv ^ ((sf ^ of) | zf)); 703 break; 704 705 default: 706 /* shouldn't really make these calls from generated code */ 707 vex_printf("x86g_calculate_condition( %u, %u, 0x%x, 0x%x, 0x%x )\n", 708 cond, cc_op, cc_dep1, cc_dep2, cc_ndep ); 709 vpanic("x86g_calculate_condition"); 710 } 711 } 712 713 714 /* VISIBLE TO LIBVEX CLIENT */ 715 UInt LibVEX_GuestX86_get_eflags ( /*IN*/VexGuestX86State* vex_state ) 716 { 717 UInt eflags = x86g_calculate_eflags_all_WRK( 718 vex_state->guest_CC_OP, 719 vex_state->guest_CC_DEP1, 720 vex_state->guest_CC_DEP2, 721 vex_state->guest_CC_NDEP 722 ); 723 UInt dflag = vex_state->guest_DFLAG; 724 vassert(dflag == 1 || dflag == 0xFFFFFFFF); 725 if (dflag == 0xFFFFFFFF) 726 eflags |= (1<<10); 727 if (vex_state->guest_IDFLAG == 1) 728 eflags |= (1<<21); 729 if (vex_state->guest_ACFLAG == 1) 730 eflags |= (1<<18); 731 732 return eflags; 733 } 734 735 /* VISIBLE TO LIBVEX CLIENT */ 736 void 737 LibVEX_GuestX86_put_eflag_c ( UInt new_carry_flag, 738 /*MOD*/VexGuestX86State* vex_state ) 739 { 740 UInt oszacp = x86g_calculate_eflags_all_WRK( 741 vex_state->guest_CC_OP, 742 vex_state->guest_CC_DEP1, 743 vex_state->guest_CC_DEP2, 744 vex_state->guest_CC_NDEP 745 ); 746 if (new_carry_flag & 1) { 747 oszacp |= X86G_CC_MASK_C; 748 } else { 749 oszacp &= ~X86G_CC_MASK_C; 750 } 751 vex_state->guest_CC_OP = X86G_CC_OP_COPY; 752 vex_state->guest_CC_DEP1 = oszacp; 753 vex_state->guest_CC_DEP2 = 0; 754 vex_state->guest_CC_NDEP = 0; 755 } 756 757 758 /*---------------------------------------------------------------*/ 759 /*--- %eflags translation-time function specialisers. ---*/ 760 /*--- These help iropt specialise calls the above run-time ---*/ 761 /*--- %eflags functions. ---*/ 762 /*---------------------------------------------------------------*/ 763 764 /* Used by the optimiser to try specialisations. Returns an 765 equivalent expression, or NULL if none. */ 766 767 static inline Bool isU32 ( IRExpr* e, UInt n ) 768 { 769 return 770 toBool( e->tag == Iex_Const 771 && e->Iex.Const.con->tag == Ico_U32 772 && e->Iex.Const.con->Ico.U32 == n ); 773 } 774 775 IRExpr* guest_x86_spechelper ( HChar* function_name, 776 IRExpr** args, 777 IRStmt** precedingStmts, 778 Int n_precedingStmts ) 779 { 780 # define unop(_op,_a1) IRExpr_Unop((_op),(_a1)) 781 # define binop(_op,_a1,_a2) IRExpr_Binop((_op),(_a1),(_a2)) 782 # define mkU32(_n) IRExpr_Const(IRConst_U32(_n)) 783 # define mkU8(_n) IRExpr_Const(IRConst_U8(_n)) 784 785 Int i, arity = 0; 786 for (i = 0; args[i]; i++) 787 arity++; 788 # if 0 789 vex_printf("spec request:\n"); 790 vex_printf(" %s ", function_name); 791 for (i = 0; i < arity; i++) { 792 vex_printf(" "); 793 ppIRExpr(args[i]); 794 } 795 vex_printf("\n"); 796 # endif 797 798 /* --------- specialising "x86g_calculate_condition" --------- */ 799 800 if (vex_streq(function_name, "x86g_calculate_condition")) { 801 /* specialise calls to above "calculate condition" function */ 802 IRExpr *cond, *cc_op, *cc_dep1, *cc_dep2; 803 vassert(arity == 5); 804 cond = args[0]; 805 cc_op = args[1]; 806 cc_dep1 = args[2]; 807 cc_dep2 = args[3]; 808 809 /*---------------- ADDL ----------------*/ 810 811 if (isU32(cc_op, X86G_CC_OP_ADDL) && isU32(cond, X86CondZ)) { 812 /* long add, then Z --> test (dst+src == 0) */ 813 return unop(Iop_1Uto32, 814 binop(Iop_CmpEQ32, 815 binop(Iop_Add32, cc_dep1, cc_dep2), 816 mkU32(0))); 817 } 818 819 /*---------------- SUBL ----------------*/ 820 821 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondZ)) { 822 /* long sub/cmp, then Z --> test dst==src */ 823 return unop(Iop_1Uto32, 824 binop(Iop_CmpEQ32, cc_dep1, cc_dep2)); 825 } 826 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNZ)) { 827 /* long sub/cmp, then NZ --> test dst!=src */ 828 return unop(Iop_1Uto32, 829 binop(Iop_CmpNE32, cc_dep1, cc_dep2)); 830 } 831 832 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondL)) { 833 /* long sub/cmp, then L (signed less than) 834 --> test dst <s src */ 835 return unop(Iop_1Uto32, 836 binop(Iop_CmpLT32S, cc_dep1, cc_dep2)); 837 } 838 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNL)) { 839 /* long sub/cmp, then NL (signed greater than or equal) 840 --> test !(dst <s src) */ 841 return binop(Iop_Xor32, 842 unop(Iop_1Uto32, 843 binop(Iop_CmpLT32S, cc_dep1, cc_dep2)), 844 mkU32(1)); 845 } 846 847 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondLE)) { 848 /* long sub/cmp, then LE (signed less than or equal) 849 --> test dst <=s src */ 850 return unop(Iop_1Uto32, 851 binop(Iop_CmpLE32S, cc_dep1, cc_dep2)); 852 } 853 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNLE)) { 854 /* long sub/cmp, then NLE (signed not less than or equal) 855 --> test dst >s src 856 --> test !(dst <=s src) */ 857 return binop(Iop_Xor32, 858 unop(Iop_1Uto32, 859 binop(Iop_CmpLE32S, cc_dep1, cc_dep2)), 860 mkU32(1)); 861 } 862 863 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondBE)) { 864 /* long sub/cmp, then BE (unsigned less than or equal) 865 --> test dst <=u src */ 866 return unop(Iop_1Uto32, 867 binop(Iop_CmpLE32U, cc_dep1, cc_dep2)); 868 } 869 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNBE)) { 870 /* long sub/cmp, then BE (unsigned greater than) 871 --> test !(dst <=u src) */ 872 return binop(Iop_Xor32, 873 unop(Iop_1Uto32, 874 binop(Iop_CmpLE32U, cc_dep1, cc_dep2)), 875 mkU32(1)); 876 } 877 878 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondB)) { 879 /* long sub/cmp, then B (unsigned less than) 880 --> test dst <u src */ 881 return unop(Iop_1Uto32, 882 binop(Iop_CmpLT32U, cc_dep1, cc_dep2)); 883 } 884 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNB)) { 885 /* long sub/cmp, then NB (unsigned greater than or equal) 886 --> test !(dst <u src) */ 887 return binop(Iop_Xor32, 888 unop(Iop_1Uto32, 889 binop(Iop_CmpLT32U, cc_dep1, cc_dep2)), 890 mkU32(1)); 891 } 892 893 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondS)) { 894 /* long sub/cmp, then S (negative) --> test (dst-src <s 0) */ 895 return unop(Iop_1Uto32, 896 binop(Iop_CmpLT32S, 897 binop(Iop_Sub32, cc_dep1, cc_dep2), 898 mkU32(0))); 899 } 900 if (isU32(cc_op, X86G_CC_OP_SUBL) && isU32(cond, X86CondNS)) { 901 /* long sub/cmp, then NS (not negative) --> test !(dst-src <s 0) */ 902 return binop(Iop_Xor32, 903 unop(Iop_1Uto32, 904 binop(Iop_CmpLT32S, 905 binop(Iop_Sub32, cc_dep1, cc_dep2), 906 mkU32(0))), 907 mkU32(1)); 908 } 909 910 /*---------------- SUBW ----------------*/ 911 912 if (isU32(cc_op, X86G_CC_OP_SUBW) && isU32(cond, X86CondZ)) { 913 /* word sub/cmp, then Z --> test dst==src */ 914 return unop(Iop_1Uto32, 915 binop(Iop_CmpEQ16, 916 unop(Iop_32to16,cc_dep1), 917 unop(Iop_32to16,cc_dep2))); 918 } 919 if (isU32(cc_op, X86G_CC_OP_SUBW) && isU32(cond, X86CondNZ)) { 920 /* word sub/cmp, then NZ --> test dst!=src */ 921 return unop(Iop_1Uto32, 922 binop(Iop_CmpNE16, 923 unop(Iop_32to16,cc_dep1), 924 unop(Iop_32to16,cc_dep2))); 925 } 926 927 /*---------------- SUBB ----------------*/ 928 929 if (isU32(cc_op, X86G_CC_OP_SUBB) && isU32(cond, X86CondZ)) { 930 /* byte sub/cmp, then Z --> test dst==src */ 931 return unop(Iop_1Uto32, 932 binop(Iop_CmpEQ8, 933 unop(Iop_32to8,cc_dep1), 934 unop(Iop_32to8,cc_dep2))); 935 } 936 if (isU32(cc_op, X86G_CC_OP_SUBB) && isU32(cond, X86CondNZ)) { 937 /* byte sub/cmp, then NZ --> test dst!=src */ 938 return unop(Iop_1Uto32, 939 binop(Iop_CmpNE8, 940 unop(Iop_32to8,cc_dep1), 941 unop(Iop_32to8,cc_dep2))); 942 } 943 944 if (isU32(cc_op, X86G_CC_OP_SUBB) && isU32(cond, X86CondNBE)) { 945 /* byte sub/cmp, then NBE (unsigned greater than) 946 --> test src <u dst */ 947 /* Note, args are opposite way round from the usual */ 948 return unop(Iop_1Uto32, 949 binop(Iop_CmpLT32U, 950 binop(Iop_And32,cc_dep2,mkU32(0xFF)), 951 binop(Iop_And32,cc_dep1,mkU32(0xFF)))); 952 } 953 954 if (isU32(cc_op, X86G_CC_OP_SUBB) && isU32(cond, X86CondS) 955 && isU32(cc_dep2, 0)) { 956 /* byte sub/cmp of zero, then S --> test (dst-0 <s 0) 957 --> test dst <s 0 958 --> (UInt)dst[7] 959 This is yet another scheme by which gcc figures out if the 960 top bit of a byte is 1 or 0. See also LOGICB/CondS below. */ 961 /* Note: isU32(cc_dep2, 0) is correct, even though this is 962 for an 8-bit comparison, since the args to the helper 963 function are always U32s. */ 964 return binop(Iop_And32, 965 binop(Iop_Shr32,cc_dep1,mkU8(7)), 966 mkU32(1)); 967 } 968 if (isU32(cc_op, X86G_CC_OP_SUBB) && isU32(cond, X86CondNS) 969 && isU32(cc_dep2, 0)) { 970 /* byte sub/cmp of zero, then NS --> test !(dst-0 <s 0) 971 --> test !(dst <s 0) 972 --> (UInt) !dst[7] 973 */ 974 return binop(Iop_Xor32, 975 binop(Iop_And32, 976 binop(Iop_Shr32,cc_dep1,mkU8(7)), 977 mkU32(1)), 978 mkU32(1)); 979 } 980 981 /*---------------- LOGICL ----------------*/ 982 983 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondZ)) { 984 /* long and/or/xor, then Z --> test dst==0 */ 985 return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dep1, mkU32(0))); 986 } 987 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondNZ)) { 988 /* long and/or/xor, then NZ --> test dst!=0 */ 989 return unop(Iop_1Uto32,binop(Iop_CmpNE32, cc_dep1, mkU32(0))); 990 } 991 992 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondLE)) { 993 /* long and/or/xor, then LE 994 This is pretty subtle. LOGIC sets SF and ZF according to the 995 result and makes OF be zero. LE computes (SZ ^ OF) | ZF, but 996 OF is zero, so this reduces to SZ | ZF -- which will be 1 iff 997 the result is <=signed 0. Hence ... 998 */ 999 return unop(Iop_1Uto32,binop(Iop_CmpLE32S, cc_dep1, mkU32(0))); 1000 } 1001 1002 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondBE)) { 1003 /* long and/or/xor, then BE 1004 LOGIC sets ZF according to the result and makes CF be zero. 1005 BE computes (CF | ZF), but CF is zero, so this reduces ZF 1006 -- which will be 1 iff the result is zero. Hence ... 1007 */ 1008 return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dep1, mkU32(0))); 1009 } 1010 1011 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondS)) { 1012 /* see comment below for (LOGICB, CondS) */ 1013 /* long and/or/xor, then S --> (UInt)result[31] */ 1014 return binop(Iop_And32, 1015 binop(Iop_Shr32,cc_dep1,mkU8(31)), 1016 mkU32(1)); 1017 } 1018 if (isU32(cc_op, X86G_CC_OP_LOGICL) && isU32(cond, X86CondNS)) { 1019 /* see comment below for (LOGICB, CondNS) */ 1020 /* long and/or/xor, then S --> (UInt) ~ result[31] */ 1021 return binop(Iop_Xor32, 1022 binop(Iop_And32, 1023 binop(Iop_Shr32,cc_dep1,mkU8(31)), 1024 mkU32(1)), 1025 mkU32(1)); 1026 } 1027 1028 /*---------------- LOGICW ----------------*/ 1029 1030 if (isU32(cc_op, X86G_CC_OP_LOGICW) && isU32(cond, X86CondZ)) { 1031 /* word and/or/xor, then Z --> test dst==0 */ 1032 return unop(Iop_1Uto32, 1033 binop(Iop_CmpEQ32, binop(Iop_And32,cc_dep1,mkU32(0xFFFF)), 1034 mkU32(0))); 1035 } 1036 1037 if (isU32(cc_op, X86G_CC_OP_LOGICW) && isU32(cond, X86CondS)) { 1038 /* see comment below for (LOGICB, CondS) */ 1039 /* word and/or/xor, then S --> (UInt)result[15] */ 1040 return binop(Iop_And32, 1041 binop(Iop_Shr32,cc_dep1,mkU8(15)), 1042 mkU32(1)); 1043 } 1044 1045 /*---------------- LOGICB ----------------*/ 1046 1047 if (isU32(cc_op, X86G_CC_OP_LOGICB) && isU32(cond, X86CondZ)) { 1048 /* byte and/or/xor, then Z --> test dst==0 */ 1049 return unop(Iop_1Uto32, 1050 binop(Iop_CmpEQ32, binop(Iop_And32,cc_dep1,mkU32(255)), 1051 mkU32(0))); 1052 } 1053 if (isU32(cc_op, X86G_CC_OP_LOGICB) && isU32(cond, X86CondNZ)) { 1054 /* byte and/or/xor, then Z --> test dst!=0 */ 1055 /* b9ac9: 84 c0 test %al,%al 1056 b9acb: 75 0d jne b9ada */ 1057 return unop(Iop_1Uto32, 1058 binop(Iop_CmpNE32, binop(Iop_And32,cc_dep1,mkU32(255)), 1059 mkU32(0))); 1060 } 1061 1062 if (isU32(cc_op, X86G_CC_OP_LOGICB) && isU32(cond, X86CondS)) { 1063 /* this is an idiom gcc sometimes uses to find out if the top 1064 bit of a byte register is set: eg testb %al,%al; js .. 1065 Since it just depends on the top bit of the byte, extract 1066 that bit and explicitly get rid of all the rest. This 1067 helps memcheck avoid false positives in the case where any 1068 of the other bits in the byte are undefined. */ 1069 /* byte and/or/xor, then S --> (UInt)result[7] */ 1070 return binop(Iop_And32, 1071 binop(Iop_Shr32,cc_dep1,mkU8(7)), 1072 mkU32(1)); 1073 } 1074 if (isU32(cc_op, X86G_CC_OP_LOGICB) && isU32(cond, X86CondNS)) { 1075 /* ditto, for negation-of-S. */ 1076 /* byte and/or/xor, then S --> (UInt) ~ result[7] */ 1077 return binop(Iop_Xor32, 1078 binop(Iop_And32, 1079 binop(Iop_Shr32,cc_dep1,mkU8(7)), 1080 mkU32(1)), 1081 mkU32(1)); 1082 } 1083 1084 /*---------------- DECL ----------------*/ 1085 1086 if (isU32(cc_op, X86G_CC_OP_DECL) && isU32(cond, X86CondZ)) { 1087 /* dec L, then Z --> test dst == 0 */ 1088 return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dep1, mkU32(0))); 1089 } 1090 1091 if (isU32(cc_op, X86G_CC_OP_DECL) && isU32(cond, X86CondS)) { 1092 /* dec L, then S --> compare DST <s 0 */ 1093 return unop(Iop_1Uto32,binop(Iop_CmpLT32S, cc_dep1, mkU32(0))); 1094 } 1095 1096 /*---------------- DECW ----------------*/ 1097 1098 if (isU32(cc_op, X86G_CC_OP_DECW) && isU32(cond, X86CondZ)) { 1099 /* dec W, then Z --> test dst == 0 */ 1100 return unop(Iop_1Uto32, 1101 binop(Iop_CmpEQ32, 1102 binop(Iop_Shl32,cc_dep1,mkU8(16)), 1103 mkU32(0))); 1104 } 1105 1106 /*---------------- INCW ----------------*/ 1107 1108 if (isU32(cc_op, X86G_CC_OP_INCW) && isU32(cond, X86CondZ)) { 1109 /* This rewrite helps memcheck on 'incw %ax ; je ...'. */ 1110 /* inc W, then Z --> test dst == 0 */ 1111 return unop(Iop_1Uto32, 1112 binop(Iop_CmpEQ32, 1113 binop(Iop_Shl32,cc_dep1,mkU8(16)), 1114 mkU32(0))); 1115 } 1116 1117 /*---------------- SHRL ----------------*/ 1118 1119 if (isU32(cc_op, X86G_CC_OP_SHRL) && isU32(cond, X86CondZ)) { 1120 /* SHRL, then Z --> test dep1 == 0 */ 1121 return unop(Iop_1Uto32,binop(Iop_CmpEQ32, cc_dep1, mkU32(0))); 1122 } 1123 1124 /*---------------- COPY ----------------*/ 1125 /* This can happen, as a result of x87 FP compares: "fcom ... ; 1126 fnstsw %ax ; sahf ; jbe" for example. */ 1127 1128 if (isU32(cc_op, X86G_CC_OP_COPY) && 1129 (isU32(cond, X86CondBE) || isU32(cond, X86CondNBE))) { 1130 /* COPY, then BE --> extract C and Z from dep1, and test 1131 (C or Z) == 1. */ 1132 /* COPY, then NBE --> extract C and Z from dep1, and test 1133 (C or Z) == 0. */ 1134 UInt nnn = isU32(cond, X86CondBE) ? 1 : 0; 1135 return 1136 unop( 1137 Iop_1Uto32, 1138 binop( 1139 Iop_CmpEQ32, 1140 binop( 1141 Iop_And32, 1142 binop( 1143 Iop_Or32, 1144 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_C)), 1145 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_Z)) 1146 ), 1147 mkU32(1) 1148 ), 1149 mkU32(nnn) 1150 ) 1151 ); 1152 } 1153 1154 if (isU32(cc_op, X86G_CC_OP_COPY) 1155 && (isU32(cond, X86CondB) || isU32(cond, X86CondNB))) { 1156 /* COPY, then B --> extract C from dep1, and test (C == 1). */ 1157 /* COPY, then NB --> extract C from dep1, and test (C == 0). */ 1158 UInt nnn = isU32(cond, X86CondB) ? 1 : 0; 1159 return 1160 unop( 1161 Iop_1Uto32, 1162 binop( 1163 Iop_CmpEQ32, 1164 binop( 1165 Iop_And32, 1166 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_C)), 1167 mkU32(1) 1168 ), 1169 mkU32(nnn) 1170 ) 1171 ); 1172 } 1173 1174 if (isU32(cc_op, X86G_CC_OP_COPY) 1175 && (isU32(cond, X86CondZ) || isU32(cond, X86CondNZ))) { 1176 /* COPY, then Z --> extract Z from dep1, and test (Z == 1). */ 1177 /* COPY, then NZ --> extract Z from dep1, and test (Z == 0). */ 1178 UInt nnn = isU32(cond, X86CondZ) ? 1 : 0; 1179 return 1180 unop( 1181 Iop_1Uto32, 1182 binop( 1183 Iop_CmpEQ32, 1184 binop( 1185 Iop_And32, 1186 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_Z)), 1187 mkU32(1) 1188 ), 1189 mkU32(nnn) 1190 ) 1191 ); 1192 } 1193 1194 if (isU32(cc_op, X86G_CC_OP_COPY) 1195 && (isU32(cond, X86CondP) || isU32(cond, X86CondNP))) { 1196 /* COPY, then P --> extract P from dep1, and test (P == 1). */ 1197 /* COPY, then NP --> extract P from dep1, and test (P == 0). */ 1198 UInt nnn = isU32(cond, X86CondP) ? 1 : 0; 1199 return 1200 unop( 1201 Iop_1Uto32, 1202 binop( 1203 Iop_CmpEQ32, 1204 binop( 1205 Iop_And32, 1206 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_P)), 1207 mkU32(1) 1208 ), 1209 mkU32(nnn) 1210 ) 1211 ); 1212 } 1213 1214 return NULL; 1215 } 1216 1217 /* --------- specialising "x86g_calculate_eflags_c" --------- */ 1218 1219 if (vex_streq(function_name, "x86g_calculate_eflags_c")) { 1220 /* specialise calls to above "calculate_eflags_c" function */ 1221 IRExpr *cc_op, *cc_dep1, *cc_dep2, *cc_ndep; 1222 vassert(arity == 4); 1223 cc_op = args[0]; 1224 cc_dep1 = args[1]; 1225 cc_dep2 = args[2]; 1226 cc_ndep = args[3]; 1227 1228 if (isU32(cc_op, X86G_CC_OP_SUBL)) { 1229 /* C after sub denotes unsigned less than */ 1230 return unop(Iop_1Uto32, 1231 binop(Iop_CmpLT32U, cc_dep1, cc_dep2)); 1232 } 1233 if (isU32(cc_op, X86G_CC_OP_SUBB)) { 1234 /* C after sub denotes unsigned less than */ 1235 return unop(Iop_1Uto32, 1236 binop(Iop_CmpLT32U, 1237 binop(Iop_And32,cc_dep1,mkU32(0xFF)), 1238 binop(Iop_And32,cc_dep2,mkU32(0xFF)))); 1239 } 1240 if (isU32(cc_op, X86G_CC_OP_LOGICL) 1241 || isU32(cc_op, X86G_CC_OP_LOGICW) 1242 || isU32(cc_op, X86G_CC_OP_LOGICB)) { 1243 /* cflag after logic is zero */ 1244 return mkU32(0); 1245 } 1246 if (isU32(cc_op, X86G_CC_OP_DECL) || isU32(cc_op, X86G_CC_OP_INCL)) { 1247 /* If the thunk is dec or inc, the cflag is supplied as CC_NDEP. */ 1248 return cc_ndep; 1249 } 1250 if (isU32(cc_op, X86G_CC_OP_COPY)) { 1251 /* cflag after COPY is stored in DEP1. */ 1252 return 1253 binop( 1254 Iop_And32, 1255 binop(Iop_Shr32, cc_dep1, mkU8(X86G_CC_SHIFT_C)), 1256 mkU32(1) 1257 ); 1258 } 1259 if (isU32(cc_op, X86G_CC_OP_ADDL)) { 1260 /* C after add denotes sum <u either arg */ 1261 return unop(Iop_1Uto32, 1262 binop(Iop_CmpLT32U, 1263 binop(Iop_Add32, cc_dep1, cc_dep2), 1264 cc_dep1)); 1265 } 1266 // ATC, requires verification, no test case known 1267 //if (isU32(cc_op, X86G_CC_OP_SMULL)) { 1268 // /* C after signed widening multiply denotes the case where 1269 // the top half of the result isn't simply the sign extension 1270 // of the bottom half (iow the result doesn't fit completely 1271 // in the bottom half). Hence: 1272 // C = hi-half(dep1 x dep2) != lo-half(dep1 x dep2) >>s 31 1273 // where 'x' denotes signed widening multiply.*/ 1274 // return 1275 // unop(Iop_1Uto32, 1276 // binop(Iop_CmpNE32, 1277 // unop(Iop_64HIto32, 1278 // binop(Iop_MullS32, cc_dep1, cc_dep2)), 1279 // binop(Iop_Sar32, 1280 // binop(Iop_Mul32, cc_dep1, cc_dep2), mkU8(31)) )); 1281 //} 1282 # if 0 1283 if (cc_op->tag == Iex_Const) { 1284 vex_printf("CFLAG "); ppIRExpr(cc_op); vex_printf("\n"); 1285 } 1286 # endif 1287 1288 return NULL; 1289 } 1290 1291 /* --------- specialising "x86g_calculate_eflags_all" --------- */ 1292 1293 if (vex_streq(function_name, "x86g_calculate_eflags_all")) { 1294 /* specialise calls to above "calculate_eflags_all" function */ 1295 IRExpr *cc_op, *cc_dep1; /*, *cc_dep2, *cc_ndep; */ 1296 vassert(arity == 4); 1297 cc_op = args[0]; 1298 cc_dep1 = args[1]; 1299 /* cc_dep2 = args[2]; */ 1300 /* cc_ndep = args[3]; */ 1301 1302 if (isU32(cc_op, X86G_CC_OP_COPY)) { 1303 /* eflags after COPY are stored in DEP1. */ 1304 return 1305 binop( 1306 Iop_And32, 1307 cc_dep1, 1308 mkU32(X86G_CC_MASK_O | X86G_CC_MASK_S | X86G_CC_MASK_Z 1309 | X86G_CC_MASK_A | X86G_CC_MASK_C | X86G_CC_MASK_P) 1310 ); 1311 } 1312 return NULL; 1313 } 1314 1315 # undef unop 1316 # undef binop 1317 # undef mkU32 1318 # undef mkU8 1319 1320 return NULL; 1321 } 1322 1323 1324 /*---------------------------------------------------------------*/ 1325 /*--- Supporting functions for x87 FPU activities. ---*/ 1326 /*---------------------------------------------------------------*/ 1327 1328 static inline Bool host_is_little_endian ( void ) 1329 { 1330 UInt x = 0x76543210; 1331 UChar* p = (UChar*)(&x); 1332 return toBool(*p == 0x10); 1333 } 1334 1335 /* 80 and 64-bit floating point formats: 1336 1337 80-bit: 1338 1339 S 0 0-------0 zero 1340 S 0 0X------X denormals 1341 S 1-7FFE 1X------X normals (all normals have leading 1) 1342 S 7FFF 10------0 infinity 1343 S 7FFF 10X-----X snan 1344 S 7FFF 11X-----X qnan 1345 1346 S is the sign bit. For runs X----X, at least one of the Xs must be 1347 nonzero. Exponent is 15 bits, fractional part is 63 bits, and 1348 there is an explicitly represented leading 1, and a sign bit, 1349 giving 80 in total. 1350 1351 64-bit avoids the confusion of an explicitly represented leading 1 1352 and so is simpler: 1353 1354 S 0 0------0 zero 1355 S 0 X------X denormals 1356 S 1-7FE any normals 1357 S 7FF 0------0 infinity 1358 S 7FF 0X-----X snan 1359 S 7FF 1X-----X qnan 1360 1361 Exponent is 11 bits, fractional part is 52 bits, and there is a 1362 sign bit, giving 64 in total. 1363 */ 1364 1365 /* Inspect a value and its tag, as per the x87 'FXAM' instruction. */ 1366 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 1367 UInt x86g_calculate_FXAM ( UInt tag, ULong dbl ) 1368 { 1369 Bool mantissaIsZero; 1370 Int bexp; 1371 UChar sign; 1372 UChar* f64; 1373 1374 vassert(host_is_little_endian()); 1375 1376 /* vex_printf("calculate_FXAM ( %d, %llx ) .. ", tag, dbl ); */ 1377 1378 f64 = (UChar*)(&dbl); 1379 sign = toUChar( (f64[7] >> 7) & 1 ); 1380 1381 /* First off, if the tag indicates the register was empty, 1382 return 1,0,sign,1 */ 1383 if (tag == 0) { 1384 /* vex_printf("Empty\n"); */ 1385 return X86G_FC_MASK_C3 | 0 | (sign << X86G_FC_SHIFT_C1) 1386 | X86G_FC_MASK_C0; 1387 } 1388 1389 bexp = (f64[7] << 4) | ((f64[6] >> 4) & 0x0F); 1390 bexp &= 0x7FF; 1391 1392 mantissaIsZero 1393 = toBool( 1394 (f64[6] & 0x0F) == 0 1395 && (f64[5] | f64[4] | f64[3] | f64[2] | f64[1] | f64[0]) == 0 1396 ); 1397 1398 /* If both exponent and mantissa are zero, the value is zero. 1399 Return 1,0,sign,0. */ 1400 if (bexp == 0 && mantissaIsZero) { 1401 /* vex_printf("Zero\n"); */ 1402 return X86G_FC_MASK_C3 | 0 1403 | (sign << X86G_FC_SHIFT_C1) | 0; 1404 } 1405 1406 /* If exponent is zero but mantissa isn't, it's a denormal. 1407 Return 1,1,sign,0. */ 1408 if (bexp == 0 && !mantissaIsZero) { 1409 /* vex_printf("Denormal\n"); */ 1410 return X86G_FC_MASK_C3 | X86G_FC_MASK_C2 1411 | (sign << X86G_FC_SHIFT_C1) | 0; 1412 } 1413 1414 /* If the exponent is 7FF and the mantissa is zero, this is an infinity. 1415 Return 0,1,sign,1. */ 1416 if (bexp == 0x7FF && mantissaIsZero) { 1417 /* vex_printf("Inf\n"); */ 1418 return 0 | X86G_FC_MASK_C2 | (sign << X86G_FC_SHIFT_C1) 1419 | X86G_FC_MASK_C0; 1420 } 1421 1422 /* If the exponent is 7FF and the mantissa isn't zero, this is a NaN. 1423 Return 0,0,sign,1. */ 1424 if (bexp == 0x7FF && !mantissaIsZero) { 1425 /* vex_printf("NaN\n"); */ 1426 return 0 | 0 | (sign << X86G_FC_SHIFT_C1) | X86G_FC_MASK_C0; 1427 } 1428 1429 /* Uh, ok, we give up. It must be a normal finite number. 1430 Return 0,1,sign,0. 1431 */ 1432 /* vex_printf("normal\n"); */ 1433 return 0 | X86G_FC_MASK_C2 | (sign << X86G_FC_SHIFT_C1) | 0; 1434 } 1435 1436 1437 /* CALLED FROM GENERATED CODE */ 1438 /* DIRTY HELPER (reads guest memory) */ 1439 ULong x86g_dirtyhelper_loadF80le ( UInt addrU ) 1440 { 1441 ULong f64; 1442 convert_f80le_to_f64le ( (UChar*)ULong_to_Ptr(addrU), (UChar*)&f64 ); 1443 return f64; 1444 } 1445 1446 /* CALLED FROM GENERATED CODE */ 1447 /* DIRTY HELPER (writes guest memory) */ 1448 void x86g_dirtyhelper_storeF80le ( UInt addrU, ULong f64 ) 1449 { 1450 convert_f64le_to_f80le( (UChar*)&f64, (UChar*)ULong_to_Ptr(addrU) ); 1451 } 1452 1453 1454 /*----------------------------------------------*/ 1455 /*--- The exported fns .. ---*/ 1456 /*----------------------------------------------*/ 1457 1458 /* Layout of the real x87 state. */ 1459 /* 13 June 05: Fpu_State and auxiliary constants was moved to 1460 g_generic_x87.h */ 1461 1462 1463 /* CLEAN HELPER */ 1464 /* fpucw[15:0] contains a x87 native format FPU control word. 1465 Extract from it the required FPROUND value and any resulting 1466 emulation warning, and return (warn << 32) | fpround value. 1467 */ 1468 ULong x86g_check_fldcw ( UInt fpucw ) 1469 { 1470 /* Decide on a rounding mode. fpucw[11:10] holds it. */ 1471 /* NOTE, encoded exactly as per enum IRRoundingMode. */ 1472 UInt rmode = (fpucw >> 10) & 3; 1473 1474 /* Detect any required emulation warnings. */ 1475 VexEmWarn ew = EmWarn_NONE; 1476 1477 if ((fpucw & 0x3F) != 0x3F) { 1478 /* unmasked exceptions! */ 1479 ew = EmWarn_X86_x87exns; 1480 } 1481 else 1482 if (((fpucw >> 8) & 3) != 3) { 1483 /* unsupported precision */ 1484 ew = EmWarn_X86_x87precision; 1485 } 1486 1487 return (((ULong)ew) << 32) | ((ULong)rmode); 1488 } 1489 1490 /* CLEAN HELPER */ 1491 /* Given fpround as an IRRoundingMode value, create a suitable x87 1492 native format FPU control word. */ 1493 UInt x86g_create_fpucw ( UInt fpround ) 1494 { 1495 fpround &= 3; 1496 return 0x037F | (fpround << 10); 1497 } 1498 1499 1500 /* CLEAN HELPER */ 1501 /* mxcsr[15:0] contains a SSE native format MXCSR value. 1502 Extract from it the required SSEROUND value and any resulting 1503 emulation warning, and return (warn << 32) | sseround value. 1504 */ 1505 ULong x86g_check_ldmxcsr ( UInt mxcsr ) 1506 { 1507 /* Decide on a rounding mode. mxcsr[14:13] holds it. */ 1508 /* NOTE, encoded exactly as per enum IRRoundingMode. */ 1509 UInt rmode = (mxcsr >> 13) & 3; 1510 1511 /* Detect any required emulation warnings. */ 1512 VexEmWarn ew = EmWarn_NONE; 1513 1514 if ((mxcsr & 0x1F80) != 0x1F80) { 1515 /* unmasked exceptions! */ 1516 ew = EmWarn_X86_sseExns; 1517 } 1518 else 1519 if (mxcsr & (1<<15)) { 1520 /* FZ is set */ 1521 ew = EmWarn_X86_fz; 1522 } 1523 else 1524 if (mxcsr & (1<<6)) { 1525 /* DAZ is set */ 1526 ew = EmWarn_X86_daz; 1527 } 1528 1529 return (((ULong)ew) << 32) | ((ULong)rmode); 1530 } 1531 1532 1533 /* CLEAN HELPER */ 1534 /* Given sseround as an IRRoundingMode value, create a suitable SSE 1535 native format MXCSR value. */ 1536 UInt x86g_create_mxcsr ( UInt sseround ) 1537 { 1538 sseround &= 3; 1539 return 0x1F80 | (sseround << 13); 1540 } 1541 1542 1543 /* CALLED FROM GENERATED CODE */ 1544 /* DIRTY HELPER (writes guest state) */ 1545 /* Initialise the x87 FPU state as per 'finit'. */ 1546 void x86g_dirtyhelper_FINIT ( VexGuestX86State* gst ) 1547 { 1548 Int i; 1549 gst->guest_FTOP = 0; 1550 for (i = 0; i < 8; i++) { 1551 gst->guest_FPTAG[i] = 0; /* empty */ 1552 gst->guest_FPREG[i] = 0; /* IEEE754 64-bit zero */ 1553 } 1554 gst->guest_FPROUND = (UInt)Irrm_NEAREST; 1555 gst->guest_FC3210 = 0; 1556 } 1557 1558 1559 /* This is used to implement both 'frstor' and 'fldenv'. The latter 1560 appears to differ from the former only in that the 8 FP registers 1561 themselves are not transferred into the guest state. */ 1562 static 1563 VexEmWarn do_put_x87 ( Bool moveRegs, 1564 /*IN*/UChar* x87_state, 1565 /*OUT*/VexGuestX86State* vex_state ) 1566 { 1567 Int stno, preg; 1568 UInt tag; 1569 ULong* vexRegs = (ULong*)(&vex_state->guest_FPREG[0]); 1570 UChar* vexTags = (UChar*)(&vex_state->guest_FPTAG[0]); 1571 Fpu_State* x87 = (Fpu_State*)x87_state; 1572 UInt ftop = (x87->env[FP_ENV_STAT] >> 11) & 7; 1573 UInt tagw = x87->env[FP_ENV_TAG]; 1574 UInt fpucw = x87->env[FP_ENV_CTRL]; 1575 UInt c3210 = x87->env[FP_ENV_STAT] & 0x4700; 1576 VexEmWarn ew; 1577 UInt fpround; 1578 ULong pair; 1579 1580 /* Copy registers and tags */ 1581 for (stno = 0; stno < 8; stno++) { 1582 preg = (stno + ftop) & 7; 1583 tag = (tagw >> (2*preg)) & 3; 1584 if (tag == 3) { 1585 /* register is empty */ 1586 /* hmm, if it's empty, does it still get written? Probably 1587 safer to say it does. If we don't, memcheck could get out 1588 of sync, in that it thinks all FP registers are defined by 1589 this helper, but in reality some have not been updated. */ 1590 if (moveRegs) 1591 vexRegs[preg] = 0; /* IEEE754 64-bit zero */ 1592 vexTags[preg] = 0; 1593 } else { 1594 /* register is non-empty */ 1595 if (moveRegs) 1596 convert_f80le_to_f64le( &x87->reg[10*stno], 1597 (UChar*)&vexRegs[preg] ); 1598 vexTags[preg] = 1; 1599 } 1600 } 1601 1602 /* stack pointer */ 1603 vex_state->guest_FTOP = ftop; 1604 1605 /* status word */ 1606 vex_state->guest_FC3210 = c3210; 1607 1608 /* handle the control word, setting FPROUND and detecting any 1609 emulation warnings. */ 1610 pair = x86g_check_fldcw ( (UInt)fpucw ); 1611 fpround = (UInt)pair; 1612 ew = (VexEmWarn)(pair >> 32); 1613 1614 vex_state->guest_FPROUND = fpround & 3; 1615 1616 /* emulation warnings --> caller */ 1617 return ew; 1618 } 1619 1620 1621 /* Create an x87 FPU state from the guest state, as close as 1622 we can approximate it. */ 1623 static 1624 void do_get_x87 ( /*IN*/VexGuestX86State* vex_state, 1625 /*OUT*/UChar* x87_state ) 1626 { 1627 Int i, stno, preg; 1628 UInt tagw; 1629 ULong* vexRegs = (ULong*)(&vex_state->guest_FPREG[0]); 1630 UChar* vexTags = (UChar*)(&vex_state->guest_FPTAG[0]); 1631 Fpu_State* x87 = (Fpu_State*)x87_state; 1632 UInt ftop = vex_state->guest_FTOP; 1633 UInt c3210 = vex_state->guest_FC3210; 1634 1635 for (i = 0; i < 14; i++) 1636 x87->env[i] = 0; 1637 1638 x87->env[1] = x87->env[3] = x87->env[5] = x87->env[13] = 0xFFFF; 1639 x87->env[FP_ENV_STAT] 1640 = toUShort(((ftop & 7) << 11) | (c3210 & 0x4700)); 1641 x87->env[FP_ENV_CTRL] 1642 = toUShort(x86g_create_fpucw( vex_state->guest_FPROUND )); 1643 1644 /* Dump the register stack in ST order. */ 1645 tagw = 0; 1646 for (stno = 0; stno < 8; stno++) { 1647 preg = (stno + ftop) & 7; 1648 if (vexTags[preg] == 0) { 1649 /* register is empty */ 1650 tagw |= (3 << (2*preg)); 1651 convert_f64le_to_f80le( (UChar*)&vexRegs[preg], 1652 &x87->reg[10*stno] ); 1653 } else { 1654 /* register is full. */ 1655 tagw |= (0 << (2*preg)); 1656 convert_f64le_to_f80le( (UChar*)&vexRegs[preg], 1657 &x87->reg[10*stno] ); 1658 } 1659 } 1660 x87->env[FP_ENV_TAG] = toUShort(tagw); 1661 } 1662 1663 1664 /* CALLED FROM GENERATED CODE */ 1665 /* DIRTY HELPER (reads guest state, writes guest mem) */ 1666 void x86g_dirtyhelper_FXSAVE ( VexGuestX86State* gst, HWord addr ) 1667 { 1668 /* Somewhat roundabout, but at least it's simple. */ 1669 Fpu_State tmp; 1670 UShort* addrS = (UShort*)addr; 1671 UChar* addrC = (UChar*)addr; 1672 U128* xmm = (U128*)(addr + 160); 1673 UInt mxcsr; 1674 UShort fp_tags; 1675 UInt summary_tags; 1676 Int r, stno; 1677 UShort *srcS, *dstS; 1678 1679 do_get_x87( gst, (UChar*)&tmp ); 1680 mxcsr = x86g_create_mxcsr( gst->guest_SSEROUND ); 1681 1682 /* Now build the proper fxsave image from the x87 image we just 1683 made. */ 1684 1685 addrS[0] = tmp.env[FP_ENV_CTRL]; /* FCW: fpu control word */ 1686 addrS[1] = tmp.env[FP_ENV_STAT]; /* FCW: fpu status word */ 1687 1688 /* set addrS[2] in an endian-independent way */ 1689 summary_tags = 0; 1690 fp_tags = tmp.env[FP_ENV_TAG]; 1691 for (r = 0; r < 8; r++) { 1692 if ( ((fp_tags >> (2*r)) & 3) != 3 ) 1693 summary_tags |= (1 << r); 1694 } 1695 addrC[4] = toUChar(summary_tags); /* FTW: tag summary byte */ 1696 addrC[5] = 0; /* pad */ 1697 1698 addrS[3] = 0; /* FOP: fpu opcode (bogus) */ 1699 addrS[4] = 0; 1700 addrS[5] = 0; /* FPU IP (bogus) */ 1701 addrS[6] = 0; /* FPU IP's segment selector (bogus) (although we 1702 could conceivably dump %CS here) */ 1703 1704 addrS[7] = 0; /* Intel reserved */ 1705 1706 addrS[8] = 0; /* FPU DP (operand pointer) (bogus) */ 1707 addrS[9] = 0; /* FPU DP (operand pointer) (bogus) */ 1708 addrS[10] = 0; /* segment selector for above operand pointer; %DS 1709 perhaps? */ 1710 addrS[11] = 0; /* Intel reserved */ 1711 1712 addrS[12] = toUShort(mxcsr); /* MXCSR */ 1713 addrS[13] = toUShort(mxcsr >> 16); 1714 1715 addrS[14] = 0xFFFF; /* MXCSR mask (lo16); who knows what for */ 1716 addrS[15] = 0xFFFF; /* MXCSR mask (hi16); who knows what for */ 1717 1718 /* Copy in the FP registers, in ST order. */ 1719 for (stno = 0; stno < 8; stno++) { 1720 srcS = (UShort*)(&tmp.reg[10*stno]); 1721 dstS = (UShort*)(&addrS[16 + 8*stno]); 1722 dstS[0] = srcS[0]; 1723 dstS[1] = srcS[1]; 1724 dstS[2] = srcS[2]; 1725 dstS[3] = srcS[3]; 1726 dstS[4] = srcS[4]; 1727 dstS[5] = 0; 1728 dstS[6] = 0; 1729 dstS[7] = 0; 1730 } 1731 1732 /* That's the first 160 bytes of the image done. Now only %xmm0 1733 .. %xmm7 remain to be copied. If the host is big-endian, these 1734 need to be byte-swapped. */ 1735 vassert(host_is_little_endian()); 1736 1737 # define COPY_U128(_dst,_src) \ 1738 do { _dst[0] = _src[0]; _dst[1] = _src[1]; \ 1739 _dst[2] = _src[2]; _dst[3] = _src[3]; } \ 1740 while (0) 1741 1742 COPY_U128( xmm[0], gst->guest_XMM0 ); 1743 COPY_U128( xmm[1], gst->guest_XMM1 ); 1744 COPY_U128( xmm[2], gst->guest_XMM2 ); 1745 COPY_U128( xmm[3], gst->guest_XMM3 ); 1746 COPY_U128( xmm[4], gst->guest_XMM4 ); 1747 COPY_U128( xmm[5], gst->guest_XMM5 ); 1748 COPY_U128( xmm[6], gst->guest_XMM6 ); 1749 COPY_U128( xmm[7], gst->guest_XMM7 ); 1750 1751 # undef COPY_U128 1752 } 1753 1754 1755 /* CALLED FROM GENERATED CODE */ 1756 /* DIRTY HELPER (writes guest state, reads guest mem) */ 1757 VexEmWarn x86g_dirtyhelper_FXRSTOR ( VexGuestX86State* gst, HWord addr ) 1758 { 1759 Fpu_State tmp; 1760 VexEmWarn warnX87 = EmWarn_NONE; 1761 VexEmWarn warnXMM = EmWarn_NONE; 1762 UShort* addrS = (UShort*)addr; 1763 UChar* addrC = (UChar*)addr; 1764 U128* xmm = (U128*)(addr + 160); 1765 UShort fp_tags; 1766 Int r, stno, i; 1767 1768 /* Restore %xmm0 .. %xmm7. If the host is big-endian, these need 1769 to be byte-swapped. */ 1770 vassert(host_is_little_endian()); 1771 1772 # define COPY_U128(_dst,_src) \ 1773 do { _dst[0] = _src[0]; _dst[1] = _src[1]; \ 1774 _dst[2] = _src[2]; _dst[3] = _src[3]; } \ 1775 while (0) 1776 1777 COPY_U128( gst->guest_XMM0, xmm[0] ); 1778 COPY_U128( gst->guest_XMM1, xmm[1] ); 1779 COPY_U128( gst->guest_XMM2, xmm[2] ); 1780 COPY_U128( gst->guest_XMM3, xmm[3] ); 1781 COPY_U128( gst->guest_XMM4, xmm[4] ); 1782 COPY_U128( gst->guest_XMM5, xmm[5] ); 1783 COPY_U128( gst->guest_XMM6, xmm[6] ); 1784 COPY_U128( gst->guest_XMM7, xmm[7] ); 1785 1786 # undef COPY_U128 1787 1788 /* Copy the x87 registers out of the image, into a temporary 1789 Fpu_State struct. */ 1790 for (i = 0; i < 14; i++) tmp.env[i] = 0; 1791 for (i = 0; i < 80; i++) tmp.reg[i] = 0; 1792 /* fill in tmp.reg[0..7] */ 1793 for (stno = 0; stno < 8; stno++) { 1794 UShort* dstS = (UShort*)(&tmp.reg[10*stno]); 1795 UShort* srcS = (UShort*)(&addrS[16 + 8*stno]); 1796 dstS[0] = srcS[0]; 1797 dstS[1] = srcS[1]; 1798 dstS[2] = srcS[2]; 1799 dstS[3] = srcS[3]; 1800 dstS[4] = srcS[4]; 1801 } 1802 /* fill in tmp.env[0..13] */ 1803 tmp.env[FP_ENV_CTRL] = addrS[0]; /* FCW: fpu control word */ 1804 tmp.env[FP_ENV_STAT] = addrS[1]; /* FCW: fpu status word */ 1805 1806 fp_tags = 0; 1807 for (r = 0; r < 8; r++) { 1808 if (addrC[4] & (1<<r)) 1809 fp_tags |= (0 << (2*r)); /* EMPTY */ 1810 else 1811 fp_tags |= (3 << (2*r)); /* VALID -- not really precise enough. */ 1812 } 1813 tmp.env[FP_ENV_TAG] = fp_tags; 1814 1815 /* Now write 'tmp' into the guest state. */ 1816 warnX87 = do_put_x87( True/*moveRegs*/, (UChar*)&tmp, gst ); 1817 1818 { UInt w32 = (((UInt)addrS[12]) & 0xFFFF) 1819 | ((((UInt)addrS[13]) & 0xFFFF) << 16); 1820 ULong w64 = x86g_check_ldmxcsr( w32 ); 1821 1822 warnXMM = (VexEmWarn)(w64 >> 32); 1823 1824 gst->guest_SSEROUND = (UInt)w64; 1825 } 1826 1827 /* Prefer an X87 emwarn over an XMM one, if both exist. */ 1828 if (warnX87 != EmWarn_NONE) 1829 return warnX87; 1830 else 1831 return warnXMM; 1832 } 1833 1834 1835 /* CALLED FROM GENERATED CODE */ 1836 /* DIRTY HELPER (reads guest state, writes guest mem) */ 1837 void x86g_dirtyhelper_FSAVE ( VexGuestX86State* gst, HWord addr ) 1838 { 1839 do_get_x87( gst, (UChar*)addr ); 1840 } 1841 1842 /* CALLED FROM GENERATED CODE */ 1843 /* DIRTY HELPER (writes guest state, reads guest mem) */ 1844 VexEmWarn x86g_dirtyhelper_FRSTOR ( VexGuestX86State* gst, HWord addr ) 1845 { 1846 return do_put_x87( True/*regs too*/, (UChar*)addr, gst ); 1847 } 1848 1849 /* CALLED FROM GENERATED CODE */ 1850 /* DIRTY HELPER (reads guest state, writes guest mem) */ 1851 void x86g_dirtyhelper_FSTENV ( VexGuestX86State* gst, HWord addr ) 1852 { 1853 /* Somewhat roundabout, but at least it's simple. */ 1854 Int i; 1855 UShort* addrP = (UShort*)addr; 1856 Fpu_State tmp; 1857 do_get_x87( gst, (UChar*)&tmp ); 1858 for (i = 0; i < 14; i++) 1859 addrP[i] = tmp.env[i]; 1860 } 1861 1862 /* CALLED FROM GENERATED CODE */ 1863 /* DIRTY HELPER (writes guest state, reads guest mem) */ 1864 VexEmWarn x86g_dirtyhelper_FLDENV ( VexGuestX86State* gst, HWord addr ) 1865 { 1866 return do_put_x87( False/*don't move regs*/, (UChar*)addr, gst); 1867 } 1868 1869 1870 /*---------------------------------------------------------------*/ 1871 /*--- Misc integer helpers, including rotates and CPUID. ---*/ 1872 /*---------------------------------------------------------------*/ 1873 1874 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 1875 /* Calculate both flags and value result for rotate right 1876 through the carry bit. Result in low 32 bits, 1877 new flags (OSZACP) in high 32 bits. 1878 */ 1879 ULong x86g_calculate_RCR ( UInt arg, UInt rot_amt, UInt eflags_in, UInt sz ) 1880 { 1881 UInt tempCOUNT = rot_amt & 0x1F, cf=0, of=0, tempcf; 1882 1883 switch (sz) { 1884 case 4: 1885 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1886 of = ((arg >> 31) ^ cf) & 1; 1887 while (tempCOUNT > 0) { 1888 tempcf = arg & 1; 1889 arg = (arg >> 1) | (cf << 31); 1890 cf = tempcf; 1891 tempCOUNT--; 1892 } 1893 break; 1894 case 2: 1895 while (tempCOUNT >= 17) tempCOUNT -= 17; 1896 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1897 of = ((arg >> 15) ^ cf) & 1; 1898 while (tempCOUNT > 0) { 1899 tempcf = arg & 1; 1900 arg = ((arg >> 1) & 0x7FFF) | (cf << 15); 1901 cf = tempcf; 1902 tempCOUNT--; 1903 } 1904 break; 1905 case 1: 1906 while (tempCOUNT >= 9) tempCOUNT -= 9; 1907 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1908 of = ((arg >> 7) ^ cf) & 1; 1909 while (tempCOUNT > 0) { 1910 tempcf = arg & 1; 1911 arg = ((arg >> 1) & 0x7F) | (cf << 7); 1912 cf = tempcf; 1913 tempCOUNT--; 1914 } 1915 break; 1916 default: 1917 vpanic("calculate_RCR: invalid size"); 1918 } 1919 1920 cf &= 1; 1921 of &= 1; 1922 eflags_in &= ~(X86G_CC_MASK_C | X86G_CC_MASK_O); 1923 eflags_in |= (cf << X86G_CC_SHIFT_C) | (of << X86G_CC_SHIFT_O); 1924 1925 return (((ULong)eflags_in) << 32) | ((ULong)arg); 1926 } 1927 1928 1929 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 1930 /* Calculate both flags and value result for rotate left 1931 through the carry bit. Result in low 32 bits, 1932 new flags (OSZACP) in high 32 bits. 1933 */ 1934 ULong x86g_calculate_RCL ( UInt arg, UInt rot_amt, UInt eflags_in, UInt sz ) 1935 { 1936 UInt tempCOUNT = rot_amt & 0x1F, cf=0, of=0, tempcf; 1937 1938 switch (sz) { 1939 case 4: 1940 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1941 while (tempCOUNT > 0) { 1942 tempcf = (arg >> 31) & 1; 1943 arg = (arg << 1) | (cf & 1); 1944 cf = tempcf; 1945 tempCOUNT--; 1946 } 1947 of = ((arg >> 31) ^ cf) & 1; 1948 break; 1949 case 2: 1950 while (tempCOUNT >= 17) tempCOUNT -= 17; 1951 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1952 while (tempCOUNT > 0) { 1953 tempcf = (arg >> 15) & 1; 1954 arg = 0xFFFF & ((arg << 1) | (cf & 1)); 1955 cf = tempcf; 1956 tempCOUNT--; 1957 } 1958 of = ((arg >> 15) ^ cf) & 1; 1959 break; 1960 case 1: 1961 while (tempCOUNT >= 9) tempCOUNT -= 9; 1962 cf = (eflags_in >> X86G_CC_SHIFT_C) & 1; 1963 while (tempCOUNT > 0) { 1964 tempcf = (arg >> 7) & 1; 1965 arg = 0xFF & ((arg << 1) | (cf & 1)); 1966 cf = tempcf; 1967 tempCOUNT--; 1968 } 1969 of = ((arg >> 7) ^ cf) & 1; 1970 break; 1971 default: 1972 vpanic("calculate_RCL: invalid size"); 1973 } 1974 1975 cf &= 1; 1976 of &= 1; 1977 eflags_in &= ~(X86G_CC_MASK_C | X86G_CC_MASK_O); 1978 eflags_in |= (cf << X86G_CC_SHIFT_C) | (of << X86G_CC_SHIFT_O); 1979 1980 return (((ULong)eflags_in) << 32) | ((ULong)arg); 1981 } 1982 1983 1984 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 1985 /* Calculate both flags and value result for DAA/DAS/AAA/AAS. 1986 AX value in low half of arg, OSZACP in upper half. 1987 See guest-x86/toIR.c usage point for details. 1988 */ 1989 static UInt calc_parity_8bit ( UInt w32 ) { 1990 UInt i; 1991 UInt p = 1; 1992 for (i = 0; i < 8; i++) 1993 p ^= (1 & (w32 >> i)); 1994 return p; 1995 } 1996 UInt x86g_calculate_daa_das_aaa_aas ( UInt flags_and_AX, UInt opcode ) 1997 { 1998 UInt r_AL = (flags_and_AX >> 0) & 0xFF; 1999 UInt r_AH = (flags_and_AX >> 8) & 0xFF; 2000 UInt r_O = (flags_and_AX >> (16 + X86G_CC_SHIFT_O)) & 1; 2001 UInt r_S = (flags_and_AX >> (16 + X86G_CC_SHIFT_S)) & 1; 2002 UInt r_Z = (flags_and_AX >> (16 + X86G_CC_SHIFT_Z)) & 1; 2003 UInt r_A = (flags_and_AX >> (16 + X86G_CC_SHIFT_A)) & 1; 2004 UInt r_C = (flags_and_AX >> (16 + X86G_CC_SHIFT_C)) & 1; 2005 UInt r_P = (flags_and_AX >> (16 + X86G_CC_SHIFT_P)) & 1; 2006 UInt result = 0; 2007 2008 switch (opcode) { 2009 case 0x27: { /* DAA */ 2010 UInt old_AL = r_AL; 2011 UInt old_C = r_C; 2012 r_C = 0; 2013 if ((r_AL & 0xF) > 9 || r_A == 1) { 2014 r_AL = r_AL + 6; 2015 r_C = old_C; 2016 if (r_AL >= 0x100) r_C = 1; 2017 r_A = 1; 2018 } else { 2019 r_A = 0; 2020 } 2021 if (old_AL > 0x99 || old_C == 1) { 2022 r_AL = r_AL + 0x60; 2023 r_C = 1; 2024 } else { 2025 r_C = 0; 2026 } 2027 /* O is undefined. S Z and P are set according to the 2028 result. */ 2029 r_AL &= 0xFF; 2030 r_O = 0; /* let's say */ 2031 r_S = (r_AL & 0x80) ? 1 : 0; 2032 r_Z = (r_AL == 0) ? 1 : 0; 2033 r_P = calc_parity_8bit( r_AL ); 2034 break; 2035 } 2036 case 0x2F: { /* DAS */ 2037 UInt old_AL = r_AL; 2038 UInt old_C = r_C; 2039 r_C = 0; 2040 if ((r_AL & 0xF) > 9 || r_A == 1) { 2041 Bool borrow = r_AL < 6; 2042 r_AL = r_AL - 6; 2043 r_C = old_C; 2044 if (borrow) r_C = 1; 2045 r_A = 1; 2046 } else { 2047 r_A = 0; 2048 } 2049 if (old_AL > 0x99 || old_C == 1) { 2050 r_AL = r_AL - 0x60; 2051 r_C = 1; 2052 } else { 2053 /* Intel docs are wrong: r_C = 0; */ 2054 } 2055 /* O is undefined. S Z and P are set according to the 2056 result. */ 2057 r_AL &= 0xFF; 2058 r_O = 0; /* let's say */ 2059 r_S = (r_AL & 0x80) ? 1 : 0; 2060 r_Z = (r_AL == 0) ? 1 : 0; 2061 r_P = calc_parity_8bit( r_AL ); 2062 break; 2063 } 2064 case 0x37: { /* AAA */ 2065 Bool nudge = r_AL > 0xF9; 2066 if ((r_AL & 0xF) > 9 || r_A == 1) { 2067 r_AL = r_AL + 6; 2068 r_AH = r_AH + 1 + (nudge ? 1 : 0); 2069 r_A = 1; 2070 r_C = 1; 2071 r_AL = r_AL & 0xF; 2072 } else { 2073 r_A = 0; 2074 r_C = 0; 2075 r_AL = r_AL & 0xF; 2076 } 2077 /* O S Z and P are undefined. */ 2078 r_O = r_S = r_Z = r_P = 0; /* let's say */ 2079 break; 2080 } 2081 case 0x3F: { /* AAS */ 2082 Bool nudge = r_AL < 0x06; 2083 if ((r_AL & 0xF) > 9 || r_A == 1) { 2084 r_AL = r_AL - 6; 2085 r_AH = r_AH - 1 - (nudge ? 1 : 0); 2086 r_A = 1; 2087 r_C = 1; 2088 r_AL = r_AL & 0xF; 2089 } else { 2090 r_A = 0; 2091 r_C = 0; 2092 r_AL = r_AL & 0xF; 2093 } 2094 /* O S Z and P are undefined. */ 2095 r_O = r_S = r_Z = r_P = 0; /* let's say */ 2096 break; 2097 } 2098 default: 2099 vassert(0); 2100 } 2101 result = ( (r_O & 1) << (16 + X86G_CC_SHIFT_O) ) 2102 | ( (r_S & 1) << (16 + X86G_CC_SHIFT_S) ) 2103 | ( (r_Z & 1) << (16 + X86G_CC_SHIFT_Z) ) 2104 | ( (r_A & 1) << (16 + X86G_CC_SHIFT_A) ) 2105 | ( (r_C & 1) << (16 + X86G_CC_SHIFT_C) ) 2106 | ( (r_P & 1) << (16 + X86G_CC_SHIFT_P) ) 2107 | ( (r_AH & 0xFF) << 8 ) 2108 | ( (r_AL & 0xFF) << 0 ); 2109 return result; 2110 } 2111 2112 UInt x86g_calculate_aad_aam ( UInt flags_and_AX, UInt opcode ) 2113 { 2114 UInt r_AL = (flags_and_AX >> 0) & 0xFF; 2115 UInt r_AH = (flags_and_AX >> 8) & 0xFF; 2116 UInt r_O = (flags_and_AX >> (16 + X86G_CC_SHIFT_O)) & 1; 2117 UInt r_S = (flags_and_AX >> (16 + X86G_CC_SHIFT_S)) & 1; 2118 UInt r_Z = (flags_and_AX >> (16 + X86G_CC_SHIFT_Z)) & 1; 2119 UInt r_A = (flags_and_AX >> (16 + X86G_CC_SHIFT_A)) & 1; 2120 UInt r_C = (flags_and_AX >> (16 + X86G_CC_SHIFT_C)) & 1; 2121 UInt r_P = (flags_and_AX >> (16 + X86G_CC_SHIFT_P)) & 1; 2122 UInt result = 0; 2123 2124 switch (opcode) { 2125 case 0xD4: { /* AAM */ 2126 r_AH = r_AL / 10; 2127 r_AL = r_AL % 10; 2128 break; 2129 } 2130 case 0xD5: { /* AAD */ 2131 r_AL = ((r_AH * 10) + r_AL) & 0xff; 2132 r_AH = 0; 2133 break; 2134 } 2135 default: 2136 vassert(0); 2137 } 2138 2139 r_O = 0; /* let's say (undefined) */ 2140 r_C = 0; /* let's say (undefined) */ 2141 r_A = 0; /* let's say (undefined) */ 2142 r_S = (r_AL & 0x80) ? 1 : 0; 2143 r_Z = (r_AL == 0) ? 1 : 0; 2144 r_P = calc_parity_8bit( r_AL ); 2145 2146 result = ( (r_O & 1) << (16 + X86G_CC_SHIFT_O) ) 2147 | ( (r_S & 1) << (16 + X86G_CC_SHIFT_S) ) 2148 | ( (r_Z & 1) << (16 + X86G_CC_SHIFT_Z) ) 2149 | ( (r_A & 1) << (16 + X86G_CC_SHIFT_A) ) 2150 | ( (r_C & 1) << (16 + X86G_CC_SHIFT_C) ) 2151 | ( (r_P & 1) << (16 + X86G_CC_SHIFT_P) ) 2152 | ( (r_AH & 0xFF) << 8 ) 2153 | ( (r_AL & 0xFF) << 0 ); 2154 return result; 2155 } 2156 2157 2158 /* CALLED FROM GENERATED CODE */ 2159 /* DIRTY HELPER (non-referentially-transparent) */ 2160 /* Horrible hack. On non-x86 platforms, return 1. */ 2161 ULong x86g_dirtyhelper_RDTSC ( void ) 2162 { 2163 # if defined(__i386__) 2164 ULong res; 2165 __asm__ __volatile__("rdtsc" : "=A" (res)); 2166 return res; 2167 # else 2168 return 1ULL; 2169 # endif 2170 } 2171 2172 2173 /* CALLED FROM GENERATED CODE */ 2174 /* DIRTY HELPER (modifies guest state) */ 2175 /* Claim to be a P55C (Intel Pentium/MMX) */ 2176 void x86g_dirtyhelper_CPUID_sse0 ( VexGuestX86State* st ) 2177 { 2178 switch (st->guest_EAX) { 2179 case 0: 2180 st->guest_EAX = 0x1; 2181 st->guest_EBX = 0x756e6547; 2182 st->guest_ECX = 0x6c65746e; 2183 st->guest_EDX = 0x49656e69; 2184 break; 2185 default: 2186 st->guest_EAX = 0x543; 2187 st->guest_EBX = 0x0; 2188 st->guest_ECX = 0x0; 2189 st->guest_EDX = 0x8001bf; 2190 break; 2191 } 2192 } 2193 2194 /* CALLED FROM GENERATED CODE */ 2195 /* DIRTY HELPER (modifies guest state) */ 2196 /* Claim to be the following SSE1-capable CPU: 2197 vendor_id : GenuineIntel 2198 cpu family : 6 2199 model : 11 2200 model name : Intel(R) Pentium(R) III CPU family 1133MHz 2201 stepping : 1 2202 cpu MHz : 1131.013 2203 cache size : 512 KB 2204 */ 2205 void x86g_dirtyhelper_CPUID_sse1 ( VexGuestX86State* st ) 2206 { 2207 switch (st->guest_EAX) { 2208 case 0: 2209 st->guest_EAX = 0x00000002; 2210 st->guest_EBX = 0x756e6547; 2211 st->guest_ECX = 0x6c65746e; 2212 st->guest_EDX = 0x49656e69; 2213 break; 2214 case 1: 2215 st->guest_EAX = 0x000006b1; 2216 st->guest_EBX = 0x00000004; 2217 st->guest_ECX = 0x00000000; 2218 st->guest_EDX = 0x0383fbff; 2219 break; 2220 default: 2221 st->guest_EAX = 0x03020101; 2222 st->guest_EBX = 0x00000000; 2223 st->guest_ECX = 0x00000000; 2224 st->guest_EDX = 0x0c040883; 2225 break; 2226 } 2227 } 2228 2229 /* Claim to be the following SSSE3-capable CPU (2 x ...): 2230 vendor_id : GenuineIntel 2231 cpu family : 6 2232 model : 15 2233 model name : Intel(R) Core(TM)2 CPU 6600 @ 2.40GHz 2234 stepping : 6 2235 cpu MHz : 2394.000 2236 cache size : 4096 KB 2237 physical id : 0 2238 siblings : 2 2239 core id : 0 2240 cpu cores : 2 2241 fpu : yes 2242 fpu_exception : yes 2243 cpuid level : 10 2244 wp : yes 2245 flags : fpu vme de pse tsc msr pae mce cx8 apic sep 2246 mtrr pge mca cmov pat pse36 clflush dts acpi 2247 mmx fxsr sse sse2 ss ht tm syscall nx lm 2248 constant_tsc pni monitor ds_cpl vmx est tm2 2249 cx16 xtpr lahf_lm 2250 bogomips : 4798.78 2251 clflush size : 64 2252 cache_alignment : 64 2253 address sizes : 36 bits physical, 48 bits virtual 2254 power management: 2255 */ 2256 void x86g_dirtyhelper_CPUID_sse2 ( VexGuestX86State* st ) 2257 { 2258 # define SET_ABCD(_a,_b,_c,_d) \ 2259 do { st->guest_EAX = (UInt)(_a); \ 2260 st->guest_EBX = (UInt)(_b); \ 2261 st->guest_ECX = (UInt)(_c); \ 2262 st->guest_EDX = (UInt)(_d); \ 2263 } while (0) 2264 2265 switch (st->guest_EAX) { 2266 case 0x00000000: 2267 SET_ABCD(0x0000000a, 0x756e6547, 0x6c65746e, 0x49656e69); 2268 break; 2269 case 0x00000001: 2270 SET_ABCD(0x000006f6, 0x00020800, 0x0000e3bd, 0xbfebfbff); 2271 break; 2272 case 0x00000002: 2273 SET_ABCD(0x05b0b101, 0x005657f0, 0x00000000, 0x2cb43049); 2274 break; 2275 case 0x00000003: 2276 SET_ABCD(0x00000000, 0x00000000, 0x00000000, 0x00000000); 2277 break; 2278 case 0x00000004: { 2279 switch (st->guest_ECX) { 2280 case 0x00000000: SET_ABCD(0x04000121, 0x01c0003f, 2281 0x0000003f, 0x00000001); break; 2282 case 0x00000001: SET_ABCD(0x04000122, 0x01c0003f, 2283 0x0000003f, 0x00000001); break; 2284 case 0x00000002: SET_ABCD(0x04004143, 0x03c0003f, 2285 0x00000fff, 0x00000001); break; 2286 default: SET_ABCD(0x00000000, 0x00000000, 2287 0x00000000, 0x00000000); break; 2288 } 2289 break; 2290 } 2291 case 0x00000005: 2292 SET_ABCD(0x00000040, 0x00000040, 0x00000003, 0x00000020); 2293 break; 2294 case 0x00000006: 2295 SET_ABCD(0x00000001, 0x00000002, 0x00000001, 0x00000000); 2296 break; 2297 case 0x00000007: 2298 SET_ABCD(0x00000000, 0x00000000, 0x00000000, 0x00000000); 2299 break; 2300 case 0x00000008: 2301 SET_ABCD(0x00000400, 0x00000000, 0x00000000, 0x00000000); 2302 break; 2303 case 0x00000009: 2304 SET_ABCD(0x00000000, 0x00000000, 0x00000000, 0x00000000); 2305 break; 2306 case 0x0000000a: 2307 unhandled_eax_value: 2308 SET_ABCD(0x07280202, 0x00000000, 0x00000000, 0x00000000); 2309 break; 2310 case 0x80000000: 2311 SET_ABCD(0x80000008, 0x00000000, 0x00000000, 0x00000000); 2312 break; 2313 case 0x80000001: 2314 SET_ABCD(0x00000000, 0x00000000, 0x00000001, 0x20100000); 2315 break; 2316 case 0x80000002: 2317 SET_ABCD(0x65746e49, 0x2952286c, 0x726f4320, 0x4d542865); 2318 break; 2319 case 0x80000003: 2320 SET_ABCD(0x43203229, 0x20205550, 0x20202020, 0x20202020); 2321 break; 2322 case 0x80000004: 2323 SET_ABCD(0x30303636, 0x20402020, 0x30342e32, 0x007a4847); 2324 break; 2325 case 0x80000005: 2326 SET_ABCD(0x00000000, 0x00000000, 0x00000000, 0x00000000); 2327 break; 2328 case 0x80000006: 2329 SET_ABCD(0x00000000, 0x00000000, 0x10008040, 0x00000000); 2330 break; 2331 case 0x80000007: 2332 SET_ABCD(0x00000000, 0x00000000, 0x00000000, 0x00000000); 2333 break; 2334 case 0x80000008: 2335 SET_ABCD(0x00003024, 0x00000000, 0x00000000, 0x00000000); 2336 break; 2337 default: 2338 goto unhandled_eax_value; 2339 } 2340 # undef SET_ABCD 2341 } 2342 2343 2344 /* CALLED FROM GENERATED CODE */ 2345 /* DIRTY HELPER (non-referentially-transparent) */ 2346 /* Horrible hack. On non-x86 platforms, return 0. */ 2347 UInt x86g_dirtyhelper_IN ( UInt portno, UInt sz/*1,2 or 4*/ ) 2348 { 2349 # if defined(__i386__) 2350 UInt r = 0; 2351 portno &= 0xFFFF; 2352 switch (sz) { 2353 case 4: 2354 __asm__ __volatile__("movl $0,%%eax; inl %w1,%0" 2355 : "=a" (r) : "Nd" (portno)); 2356 break; 2357 case 2: 2358 __asm__ __volatile__("movl $0,%%eax; inw %w1,%w0" 2359 : "=a" (r) : "Nd" (portno)); 2360 break; 2361 case 1: 2362 __asm__ __volatile__("movl $0,%%eax; inb %w1,%b0" 2363 : "=a" (r) : "Nd" (portno)); 2364 break; 2365 default: 2366 break; 2367 } 2368 return r; 2369 # else 2370 return 0; 2371 # endif 2372 } 2373 2374 2375 /* CALLED FROM GENERATED CODE */ 2376 /* DIRTY HELPER (non-referentially-transparent) */ 2377 /* Horrible hack. On non-x86 platforms, do nothing. */ 2378 void x86g_dirtyhelper_OUT ( UInt portno, UInt data, UInt sz/*1,2 or 4*/ ) 2379 { 2380 # if defined(__i386__) 2381 portno &= 0xFFFF; 2382 switch (sz) { 2383 case 4: 2384 __asm__ __volatile__("outl %0, %w1" 2385 : : "a" (data), "Nd" (portno)); 2386 break; 2387 case 2: 2388 __asm__ __volatile__("outw %w0, %w1" 2389 : : "a" (data), "Nd" (portno)); 2390 break; 2391 case 1: 2392 __asm__ __volatile__("outb %b0, %w1" 2393 : : "a" (data), "Nd" (portno)); 2394 break; 2395 default: 2396 break; 2397 } 2398 # else 2399 /* do nothing */ 2400 # endif 2401 } 2402 2403 /* CALLED FROM GENERATED CODE */ 2404 /* DIRTY HELPER (non-referentially-transparent) */ 2405 /* Horrible hack. On non-x86 platforms, do nothing. */ 2406 /* op = 0: call the native SGDT instruction. 2407 op = 1: call the native SIDT instruction. 2408 */ 2409 void x86g_dirtyhelper_SxDT ( void *address, UInt op ) { 2410 # if defined(__i386__) 2411 switch (op) { 2412 case 0: 2413 __asm__ __volatile__("sgdt (%0)" : : "r" (address) : "memory"); 2414 break; 2415 case 1: 2416 __asm__ __volatile__("sidt (%0)" : : "r" (address) : "memory"); 2417 break; 2418 default: 2419 vpanic("x86g_dirtyhelper_SxDT"); 2420 } 2421 # else 2422 /* do nothing */ 2423 UChar* p = (UChar*)address; 2424 p[0] = p[1] = p[2] = p[3] = p[4] = p[5] = 0; 2425 # endif 2426 } 2427 2428 /*---------------------------------------------------------------*/ 2429 /*--- Helpers for MMX/SSE/SSE2. ---*/ 2430 /*---------------------------------------------------------------*/ 2431 2432 static inline UChar abdU8 ( UChar xx, UChar yy ) { 2433 return toUChar(xx>yy ? xx-yy : yy-xx); 2434 } 2435 2436 static inline ULong mk32x2 ( UInt w1, UInt w0 ) { 2437 return (((ULong)w1) << 32) | ((ULong)w0); 2438 } 2439 2440 static inline UShort sel16x4_3 ( ULong w64 ) { 2441 UInt hi32 = toUInt(w64 >> 32); 2442 return toUShort(hi32 >> 16); 2443 } 2444 static inline UShort sel16x4_2 ( ULong w64 ) { 2445 UInt hi32 = toUInt(w64 >> 32); 2446 return toUShort(hi32); 2447 } 2448 static inline UShort sel16x4_1 ( ULong w64 ) { 2449 UInt lo32 = toUInt(w64); 2450 return toUShort(lo32 >> 16); 2451 } 2452 static inline UShort sel16x4_0 ( ULong w64 ) { 2453 UInt lo32 = toUInt(w64); 2454 return toUShort(lo32); 2455 } 2456 2457 static inline UChar sel8x8_7 ( ULong w64 ) { 2458 UInt hi32 = toUInt(w64 >> 32); 2459 return toUChar(hi32 >> 24); 2460 } 2461 static inline UChar sel8x8_6 ( ULong w64 ) { 2462 UInt hi32 = toUInt(w64 >> 32); 2463 return toUChar(hi32 >> 16); 2464 } 2465 static inline UChar sel8x8_5 ( ULong w64 ) { 2466 UInt hi32 = toUInt(w64 >> 32); 2467 return toUChar(hi32 >> 8); 2468 } 2469 static inline UChar sel8x8_4 ( ULong w64 ) { 2470 UInt hi32 = toUInt(w64 >> 32); 2471 return toUChar(hi32 >> 0); 2472 } 2473 static inline UChar sel8x8_3 ( ULong w64 ) { 2474 UInt lo32 = toUInt(w64); 2475 return toUChar(lo32 >> 24); 2476 } 2477 static inline UChar sel8x8_2 ( ULong w64 ) { 2478 UInt lo32 = toUInt(w64); 2479 return toUChar(lo32 >> 16); 2480 } 2481 static inline UChar sel8x8_1 ( ULong w64 ) { 2482 UInt lo32 = toUInt(w64); 2483 return toUChar(lo32 >> 8); 2484 } 2485 static inline UChar sel8x8_0 ( ULong w64 ) { 2486 UInt lo32 = toUInt(w64); 2487 return toUChar(lo32 >> 0); 2488 } 2489 2490 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 2491 ULong x86g_calculate_mmx_pmaddwd ( ULong xx, ULong yy ) 2492 { 2493 return 2494 mk32x2( 2495 (((Int)(Short)sel16x4_3(xx)) * ((Int)(Short)sel16x4_3(yy))) 2496 + (((Int)(Short)sel16x4_2(xx)) * ((Int)(Short)sel16x4_2(yy))), 2497 (((Int)(Short)sel16x4_1(xx)) * ((Int)(Short)sel16x4_1(yy))) 2498 + (((Int)(Short)sel16x4_0(xx)) * ((Int)(Short)sel16x4_0(yy))) 2499 ); 2500 } 2501 2502 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 2503 UInt x86g_calculate_mmx_pmovmskb ( ULong xx ) 2504 { 2505 UInt r = 0; 2506 if (xx & (1ULL << (64-1))) r |= (1<<7); 2507 if (xx & (1ULL << (56-1))) r |= (1<<6); 2508 if (xx & (1ULL << (48-1))) r |= (1<<5); 2509 if (xx & (1ULL << (40-1))) r |= (1<<4); 2510 if (xx & (1ULL << (32-1))) r |= (1<<3); 2511 if (xx & (1ULL << (24-1))) r |= (1<<2); 2512 if (xx & (1ULL << (16-1))) r |= (1<<1); 2513 if (xx & (1ULL << ( 8-1))) r |= (1<<0); 2514 return r; 2515 } 2516 2517 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 2518 ULong x86g_calculate_mmx_psadbw ( ULong xx, ULong yy ) 2519 { 2520 UInt t = 0; 2521 t += (UInt)abdU8( sel8x8_7(xx), sel8x8_7(yy) ); 2522 t += (UInt)abdU8( sel8x8_6(xx), sel8x8_6(yy) ); 2523 t += (UInt)abdU8( sel8x8_5(xx), sel8x8_5(yy) ); 2524 t += (UInt)abdU8( sel8x8_4(xx), sel8x8_4(yy) ); 2525 t += (UInt)abdU8( sel8x8_3(xx), sel8x8_3(yy) ); 2526 t += (UInt)abdU8( sel8x8_2(xx), sel8x8_2(yy) ); 2527 t += (UInt)abdU8( sel8x8_1(xx), sel8x8_1(yy) ); 2528 t += (UInt)abdU8( sel8x8_0(xx), sel8x8_0(yy) ); 2529 t &= 0xFFFF; 2530 return (ULong)t; 2531 } 2532 2533 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 2534 UInt x86g_calculate_sse_pmovmskb ( ULong w64hi, ULong w64lo ) 2535 { 2536 UInt rHi8 = x86g_calculate_mmx_pmovmskb ( w64hi ); 2537 UInt rLo8 = x86g_calculate_mmx_pmovmskb ( w64lo ); 2538 return ((rHi8 & 0xFF) << 8) | (rLo8 & 0xFF); 2539 } 2540 2541 2542 /*---------------------------------------------------------------*/ 2543 /*--- Helpers for dealing with segment overrides. ---*/ 2544 /*---------------------------------------------------------------*/ 2545 2546 static inline 2547 UInt get_segdescr_base ( VexGuestX86SegDescr* ent ) 2548 { 2549 UInt lo = 0xFFFF & (UInt)ent->LdtEnt.Bits.BaseLow; 2550 UInt mid = 0xFF & (UInt)ent->LdtEnt.Bits.BaseMid; 2551 UInt hi = 0xFF & (UInt)ent->LdtEnt.Bits.BaseHi; 2552 return (hi << 24) | (mid << 16) | lo; 2553 } 2554 2555 static inline 2556 UInt get_segdescr_limit ( VexGuestX86SegDescr* ent ) 2557 { 2558 UInt lo = 0xFFFF & (UInt)ent->LdtEnt.Bits.LimitLow; 2559 UInt hi = 0xF & (UInt)ent->LdtEnt.Bits.LimitHi; 2560 UInt limit = (hi << 16) | lo; 2561 if (ent->LdtEnt.Bits.Granularity) 2562 limit = (limit << 12) | 0xFFF; 2563 return limit; 2564 } 2565 2566 /* CALLED FROM GENERATED CODE: CLEAN HELPER */ 2567 ULong x86g_use_seg_selector ( HWord ldt, HWord gdt, 2568 UInt seg_selector, UInt virtual_addr ) 2569 { 2570 UInt tiBit, base, limit; 2571 VexGuestX86SegDescr* the_descrs; 2572 2573 Bool verboze = False; 2574 2575 /* If this isn't true, we're in Big Trouble. */ 2576 vassert(8 == sizeof(VexGuestX86SegDescr)); 2577 2578 if (verboze) 2579 vex_printf("x86h_use_seg_selector: " 2580 "seg_selector = 0x%x, vaddr = 0x%x\n", 2581 seg_selector, virtual_addr); 2582 2583 /* Check for wildly invalid selector. */ 2584 if (seg_selector & ~0xFFFF) 2585 goto bad; 2586 2587 seg_selector &= 0x0000FFFF; 2588 2589 /* Sanity check the segment selector. Ensure that RPL=11b (least 2590 privilege). This forms the bottom 2 bits of the selector. */ 2591 if ((seg_selector & 3) != 3) 2592 goto bad; 2593 2594 /* Extract the TI bit (0 means GDT, 1 means LDT) */ 2595 tiBit = (seg_selector >> 2) & 1; 2596 2597 /* Convert the segment selector onto a table index */ 2598 seg_selector >>= 3; 2599 vassert(seg_selector >= 0 && seg_selector < 8192); 2600 2601 if (tiBit == 0) { 2602 2603 /* GDT access. */ 2604 /* Do we actually have a GDT to look at? */ 2605 if (gdt == 0) 2606 goto bad; 2607 2608 /* Check for access to non-existent entry. */ 2609 if (seg_selector >= VEX_GUEST_X86_GDT_NENT) 2610 goto bad; 2611 2612 the_descrs = (VexGuestX86SegDescr*)gdt; 2613 base = get_segdescr_base (&the_descrs[seg_selector]); 2614 limit = get_segdescr_limit(&the_descrs[seg_selector]); 2615 2616 } else { 2617 2618 /* All the same stuff, except for the LDT. */ 2619 if (ldt == 0) 2620 goto bad; 2621 2622 if (seg_selector >= VEX_GUEST_X86_LDT_NENT) 2623 goto bad; 2624 2625 the_descrs = (VexGuestX86SegDescr*)ldt; 2626 base = get_segdescr_base (&the_descrs[seg_selector]); 2627 limit = get_segdescr_limit(&the_descrs[seg_selector]); 2628 2629 } 2630 2631 /* Do the limit check. Note, this check is just slightly too 2632 slack. Really it should be "if (virtual_addr + size - 1 >= 2633 limit)," but we don't have the size info to hand. Getting it 2634 could be significantly complex. */ 2635 if (virtual_addr >= limit) 2636 goto bad; 2637 2638 if (verboze) 2639 vex_printf("x86h_use_seg_selector: " 2640 "base = 0x%x, addr = 0x%x\n", 2641 base, base + virtual_addr); 2642 2643 /* High 32 bits are zero, indicating success. */ 2644 return (ULong)( ((UInt)virtual_addr) + base ); 2645 2646 bad: 2647 return 1ULL << 32; 2648 } 2649 2650 2651 /*---------------------------------------------------------------*/ 2652 /*--- Helpers for dealing with, and describing, ---*/ 2653 /*--- guest state as a whole. ---*/ 2654 /*---------------------------------------------------------------*/ 2655 2656 /* Initialise the entire x86 guest state. */ 2657 /* VISIBLE TO LIBVEX CLIENT */ 2658 void LibVEX_GuestX86_initialise ( /*OUT*/VexGuestX86State* vex_state ) 2659 { 2660 vex_state->guest_EAX = 0; 2661 vex_state->guest_ECX = 0; 2662 vex_state->guest_EDX = 0; 2663 vex_state->guest_EBX = 0; 2664 vex_state->guest_ESP = 0; 2665 vex_state->guest_EBP = 0; 2666 vex_state->guest_ESI = 0; 2667 vex_state->guest_EDI = 0; 2668 2669 vex_state->guest_CC_OP = X86G_CC_OP_COPY; 2670 vex_state->guest_CC_DEP1 = 0; 2671 vex_state->guest_CC_DEP2 = 0; 2672 vex_state->guest_CC_NDEP = 0; 2673 vex_state->guest_DFLAG = 1; /* forwards */ 2674 vex_state->guest_IDFLAG = 0; 2675 vex_state->guest_ACFLAG = 0; 2676 2677 vex_state->guest_EIP = 0; 2678 2679 /* Initialise the simulated FPU */ 2680 x86g_dirtyhelper_FINIT( vex_state ); 2681 2682 /* Initialse the SSE state. */ 2683 # define SSEZERO(_xmm) _xmm[0]=_xmm[1]=_xmm[2]=_xmm[3] = 0; 2684 2685 vex_state->guest_SSEROUND = (UInt)Irrm_NEAREST; 2686 SSEZERO(vex_state->guest_XMM0); 2687 SSEZERO(vex_state->guest_XMM1); 2688 SSEZERO(vex_state->guest_XMM2); 2689 SSEZERO(vex_state->guest_XMM3); 2690 SSEZERO(vex_state->guest_XMM4); 2691 SSEZERO(vex_state->guest_XMM5); 2692 SSEZERO(vex_state->guest_XMM6); 2693 SSEZERO(vex_state->guest_XMM7); 2694 2695 # undef SSEZERO 2696 2697 vex_state->guest_CS = 0; 2698 vex_state->guest_DS = 0; 2699 vex_state->guest_ES = 0; 2700 vex_state->guest_FS = 0; 2701 vex_state->guest_GS = 0; 2702 vex_state->guest_SS = 0; 2703 vex_state->guest_LDT = 0; 2704 vex_state->guest_GDT = 0; 2705 2706 vex_state->guest_EMWARN = EmWarn_NONE; 2707 2708 /* SSE2 has a 'clflush' cache-line-invalidator which uses these. */ 2709 vex_state->guest_TISTART = 0; 2710 vex_state->guest_TILEN = 0; 2711 2712 vex_state->guest_NRADDR = 0; 2713 vex_state->guest_SC_CLASS = 0; 2714 vex_state->guest_IP_AT_SYSCALL = 0; 2715 2716 vex_state->padding1 = 0; 2717 vex_state->padding2 = 0; 2718 vex_state->padding3 = 0; 2719 } 2720 2721 2722 /* Figure out if any part of the guest state contained in minoff 2723 .. maxoff requires precise memory exceptions. If in doubt return 2724 True (but this is generates significantly slower code). 2725 2726 By default we enforce precise exns for guest %ESP, %EBP and %EIP 2727 only. These are the minimum needed to extract correct stack 2728 backtraces from x86 code. 2729 */ 2730 Bool guest_x86_state_requires_precise_mem_exns ( Int minoff, 2731 Int maxoff) 2732 { 2733 Int ebp_min = offsetof(VexGuestX86State, guest_EBP); 2734 Int ebp_max = ebp_min + 4 - 1; 2735 Int esp_min = offsetof(VexGuestX86State, guest_ESP); 2736 Int esp_max = esp_min + 4 - 1; 2737 Int eip_min = offsetof(VexGuestX86State, guest_EIP); 2738 Int eip_max = eip_min + 4 - 1; 2739 2740 if (maxoff < ebp_min || minoff > ebp_max) { 2741 /* no overlap with ebp */ 2742 } else { 2743 return True; 2744 } 2745 2746 if (maxoff < esp_min || minoff > esp_max) { 2747 /* no overlap with esp */ 2748 } else { 2749 return True; 2750 } 2751 2752 if (maxoff < eip_min || minoff > eip_max) { 2753 /* no overlap with eip */ 2754 } else { 2755 return True; 2756 } 2757 2758 return False; 2759 } 2760 2761 2762 #define ALWAYSDEFD(field) \ 2763 { offsetof(VexGuestX86State, field), \ 2764 (sizeof ((VexGuestX86State*)0)->field) } 2765 2766 VexGuestLayout 2767 x86guest_layout 2768 = { 2769 /* Total size of the guest state, in bytes. */ 2770 .total_sizeB = sizeof(VexGuestX86State), 2771 2772 /* Describe the stack pointer. */ 2773 .offset_SP = offsetof(VexGuestX86State,guest_ESP), 2774 .sizeof_SP = 4, 2775 2776 /* Describe the frame pointer. */ 2777 .offset_FP = offsetof(VexGuestX86State,guest_EBP), 2778 .sizeof_FP = 4, 2779 2780 /* Describe the instruction pointer. */ 2781 .offset_IP = offsetof(VexGuestX86State,guest_EIP), 2782 .sizeof_IP = 4, 2783 2784 /* Describe any sections to be regarded by Memcheck as 2785 'always-defined'. */ 2786 .n_alwaysDefd = 24, 2787 2788 /* flags thunk: OP and NDEP are always defd, whereas DEP1 2789 and DEP2 have to be tracked. See detailed comment in 2790 gdefs.h on meaning of thunk fields. */ 2791 .alwaysDefd 2792 = { /* 0 */ ALWAYSDEFD(guest_CC_OP), 2793 /* 1 */ ALWAYSDEFD(guest_CC_NDEP), 2794 /* 2 */ ALWAYSDEFD(guest_DFLAG), 2795 /* 3 */ ALWAYSDEFD(guest_IDFLAG), 2796 /* 4 */ ALWAYSDEFD(guest_ACFLAG), 2797 /* 5 */ ALWAYSDEFD(guest_EIP), 2798 /* 6 */ ALWAYSDEFD(guest_FTOP), 2799 /* 7 */ ALWAYSDEFD(guest_FPTAG), 2800 /* 8 */ ALWAYSDEFD(guest_FPROUND), 2801 /* 9 */ ALWAYSDEFD(guest_FC3210), 2802 /* 10 */ ALWAYSDEFD(guest_CS), 2803 /* 11 */ ALWAYSDEFD(guest_DS), 2804 /* 12 */ ALWAYSDEFD(guest_ES), 2805 /* 13 */ ALWAYSDEFD(guest_FS), 2806 /* 14 */ ALWAYSDEFD(guest_GS), 2807 /* 15 */ ALWAYSDEFD(guest_SS), 2808 /* 16 */ ALWAYSDEFD(guest_LDT), 2809 /* 17 */ ALWAYSDEFD(guest_GDT), 2810 /* 18 */ ALWAYSDEFD(guest_EMWARN), 2811 /* 19 */ ALWAYSDEFD(guest_SSEROUND), 2812 /* 20 */ ALWAYSDEFD(guest_TISTART), 2813 /* 21 */ ALWAYSDEFD(guest_TILEN), 2814 /* 22 */ ALWAYSDEFD(guest_SC_CLASS), 2815 /* 23 */ ALWAYSDEFD(guest_IP_AT_SYSCALL) 2816 } 2817 }; 2818 2819 2820 /*---------------------------------------------------------------*/ 2821 /*--- end guest_x86_helpers.c ---*/ 2822 /*---------------------------------------------------------------*/ 2823
