1 /* 2 * x86 segmentation related helpers: 3 * TSS, interrupts, system calls, jumps and call/task gates, descriptors 4 * 5 * Copyright (c) 2003 Fabrice Bellard 6 * 7 * This library is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * This library is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include "qemu/osdep.h" 22 #include "cpu.h" 23 #include "qemu/log.h" 24 #include "exec/helper-proto.h" 25 #include "exec/exec-all.h" 26 #include "exec/cpu_ldst.h" 27 #include "exec/log.h" 28 #include "helper-tcg.h" 29 #include "seg_helper.h" 30 31 /* return non zero if error */ 32 static inline int load_segment_ra(CPUX86State *env, uint32_t *e1_ptr, 33 uint32_t *e2_ptr, int selector, 34 uintptr_t retaddr) 35 { 36 SegmentCache *dt; 37 int index; 38 target_ulong ptr; 39 40 if (selector & 0x4) { 41 dt = &env->ldt; 42 } else { 43 dt = &env->gdt; 44 } 45 index = selector & ~7; 46 if ((index + 7) > dt->limit) { 47 return -1; 48 } 49 ptr = dt->base + index; 50 *e1_ptr = cpu_ldl_kernel_ra(env, ptr, retaddr); 51 *e2_ptr = cpu_ldl_kernel_ra(env, ptr + 4, retaddr); 52 return 0; 53 } 54 55 static inline int load_segment(CPUX86State *env, uint32_t *e1_ptr, 56 uint32_t *e2_ptr, int selector) 57 { 58 return load_segment_ra(env, e1_ptr, e2_ptr, selector, 0); 59 } 60 61 static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2) 62 { 63 unsigned int limit; 64 65 limit = (e1 & 0xffff) | (e2 & 0x000f0000); 66 if (e2 & DESC_G_MASK) { 67 limit = (limit << 12) | 0xfff; 68 } 69 return limit; 70 } 71 72 static inline uint32_t get_seg_base(uint32_t e1, uint32_t e2) 73 { 74 return (e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000); 75 } 76 77 static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1, 78 uint32_t e2) 79 { 80 sc->base = get_seg_base(e1, e2); 81 sc->limit = get_seg_limit(e1, e2); 82 sc->flags = e2; 83 } 84 85 /* init the segment cache in vm86 mode. */ 86 static inline void load_seg_vm(CPUX86State *env, int seg, int selector) 87 { 88 selector &= 0xffff; 89 90 cpu_x86_load_seg_cache(env, seg, selector, (selector << 4), 0xffff, 91 DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | 92 DESC_A_MASK | (3 << DESC_DPL_SHIFT)); 93 } 94 95 static inline void get_ss_esp_from_tss(CPUX86State *env, uint32_t *ss_ptr, 96 uint32_t *esp_ptr, int dpl, 97 uintptr_t retaddr) 98 { 99 X86CPU *cpu = env_archcpu(env); 100 int type, index, shift; 101 102 #if 0 103 { 104 int i; 105 printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit); 106 for (i = 0; i < env->tr.limit; i++) { 107 printf("%02x ", env->tr.base[i]); 108 if ((i & 7) == 7) { 109 printf("\n"); 110 } 111 } 112 printf("\n"); 113 } 114 #endif 115 116 if (!(env->tr.flags & DESC_P_MASK)) { 117 cpu_abort(CPU(cpu), "invalid tss"); 118 } 119 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; 120 if ((type & 7) != 1) { 121 cpu_abort(CPU(cpu), "invalid tss type"); 122 } 123 shift = type >> 3; 124 index = (dpl * 4 + 2) << shift; 125 if (index + (4 << shift) - 1 > env->tr.limit) { 126 raise_exception_err_ra(env, EXCP0A_TSS, env->tr.selector & 0xfffc, retaddr); 127 } 128 if (shift == 0) { 129 *esp_ptr = cpu_lduw_kernel_ra(env, env->tr.base + index, retaddr); 130 *ss_ptr = cpu_lduw_kernel_ra(env, env->tr.base + index + 2, retaddr); 131 } else { 132 *esp_ptr = cpu_ldl_kernel_ra(env, env->tr.base + index, retaddr); 133 *ss_ptr = cpu_lduw_kernel_ra(env, env->tr.base + index + 4, retaddr); 134 } 135 } 136 137 static void tss_load_seg(CPUX86State *env, X86Seg seg_reg, int selector, 138 int cpl, uintptr_t retaddr) 139 { 140 uint32_t e1, e2; 141 int rpl, dpl; 142 143 if ((selector & 0xfffc) != 0) { 144 if (load_segment_ra(env, &e1, &e2, selector, retaddr) != 0) { 145 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 146 } 147 if (!(e2 & DESC_S_MASK)) { 148 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 149 } 150 rpl = selector & 3; 151 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 152 if (seg_reg == R_CS) { 153 if (!(e2 & DESC_CS_MASK)) { 154 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 155 } 156 if (dpl != rpl) { 157 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 158 } 159 } else if (seg_reg == R_SS) { 160 /* SS must be writable data */ 161 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) { 162 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 163 } 164 if (dpl != cpl || dpl != rpl) { 165 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 166 } 167 } else { 168 /* not readable code */ 169 if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) { 170 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 171 } 172 /* if data or non conforming code, checks the rights */ 173 if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) { 174 if (dpl < cpl || dpl < rpl) { 175 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 176 } 177 } 178 } 179 if (!(e2 & DESC_P_MASK)) { 180 raise_exception_err_ra(env, EXCP0B_NOSEG, selector & 0xfffc, retaddr); 181 } 182 cpu_x86_load_seg_cache(env, seg_reg, selector, 183 get_seg_base(e1, e2), 184 get_seg_limit(e1, e2), 185 e2); 186 } else { 187 if (seg_reg == R_SS || seg_reg == R_CS) { 188 raise_exception_err_ra(env, EXCP0A_TSS, selector & 0xfffc, retaddr); 189 } 190 } 191 } 192 193 #define SWITCH_TSS_JMP 0 194 #define SWITCH_TSS_IRET 1 195 #define SWITCH_TSS_CALL 2 196 197 /* XXX: restore CPU state in registers (PowerPC case) */ 198 static void switch_tss_ra(CPUX86State *env, int tss_selector, 199 uint32_t e1, uint32_t e2, int source, 200 uint32_t next_eip, uintptr_t retaddr) 201 { 202 int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i; 203 target_ulong tss_base; 204 uint32_t new_regs[8], new_segs[6]; 205 uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap; 206 uint32_t old_eflags, eflags_mask; 207 SegmentCache *dt; 208 int index; 209 target_ulong ptr; 210 211 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 212 LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type, 213 source); 214 215 /* if task gate, we read the TSS segment and we load it */ 216 if (type == 5) { 217 if (!(e2 & DESC_P_MASK)) { 218 raise_exception_err_ra(env, EXCP0B_NOSEG, tss_selector & 0xfffc, retaddr); 219 } 220 tss_selector = e1 >> 16; 221 if (tss_selector & 4) { 222 raise_exception_err_ra(env, EXCP0A_TSS, tss_selector & 0xfffc, retaddr); 223 } 224 if (load_segment_ra(env, &e1, &e2, tss_selector, retaddr) != 0) { 225 raise_exception_err_ra(env, EXCP0D_GPF, tss_selector & 0xfffc, retaddr); 226 } 227 if (e2 & DESC_S_MASK) { 228 raise_exception_err_ra(env, EXCP0D_GPF, tss_selector & 0xfffc, retaddr); 229 } 230 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 231 if ((type & 7) != 1) { 232 raise_exception_err_ra(env, EXCP0D_GPF, tss_selector & 0xfffc, retaddr); 233 } 234 } 235 236 if (!(e2 & DESC_P_MASK)) { 237 raise_exception_err_ra(env, EXCP0B_NOSEG, tss_selector & 0xfffc, retaddr); 238 } 239 240 if (type & 8) { 241 tss_limit_max = 103; 242 } else { 243 tss_limit_max = 43; 244 } 245 tss_limit = get_seg_limit(e1, e2); 246 tss_base = get_seg_base(e1, e2); 247 if ((tss_selector & 4) != 0 || 248 tss_limit < tss_limit_max) { 249 raise_exception_err_ra(env, EXCP0A_TSS, tss_selector & 0xfffc, retaddr); 250 } 251 old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; 252 if (old_type & 8) { 253 old_tss_limit_max = 103; 254 } else { 255 old_tss_limit_max = 43; 256 } 257 258 /* read all the registers from the new TSS */ 259 if (type & 8) { 260 /* 32 bit */ 261 new_cr3 = cpu_ldl_kernel_ra(env, tss_base + 0x1c, retaddr); 262 new_eip = cpu_ldl_kernel_ra(env, tss_base + 0x20, retaddr); 263 new_eflags = cpu_ldl_kernel_ra(env, tss_base + 0x24, retaddr); 264 for (i = 0; i < 8; i++) { 265 new_regs[i] = cpu_ldl_kernel_ra(env, tss_base + (0x28 + i * 4), 266 retaddr); 267 } 268 for (i = 0; i < 6; i++) { 269 new_segs[i] = cpu_lduw_kernel_ra(env, tss_base + (0x48 + i * 4), 270 retaddr); 271 } 272 new_ldt = cpu_lduw_kernel_ra(env, tss_base + 0x60, retaddr); 273 new_trap = cpu_ldl_kernel_ra(env, tss_base + 0x64, retaddr); 274 } else { 275 /* 16 bit */ 276 new_cr3 = 0; 277 new_eip = cpu_lduw_kernel_ra(env, tss_base + 0x0e, retaddr); 278 new_eflags = cpu_lduw_kernel_ra(env, tss_base + 0x10, retaddr); 279 for (i = 0; i < 8; i++) { 280 new_regs[i] = cpu_lduw_kernel_ra(env, tss_base + (0x12 + i * 2), retaddr); 281 } 282 for (i = 0; i < 4; i++) { 283 new_segs[i] = cpu_lduw_kernel_ra(env, tss_base + (0x22 + i * 2), 284 retaddr); 285 } 286 new_ldt = cpu_lduw_kernel_ra(env, tss_base + 0x2a, retaddr); 287 new_segs[R_FS] = 0; 288 new_segs[R_GS] = 0; 289 new_trap = 0; 290 } 291 /* XXX: avoid a compiler warning, see 292 http://support.amd.com/us/Processor_TechDocs/24593.pdf 293 chapters 12.2.5 and 13.2.4 on how to implement TSS Trap bit */ 294 (void)new_trap; 295 296 /* NOTE: we must avoid memory exceptions during the task switch, 297 so we make dummy accesses before */ 298 /* XXX: it can still fail in some cases, so a bigger hack is 299 necessary to valid the TLB after having done the accesses */ 300 301 v1 = cpu_ldub_kernel_ra(env, env->tr.base, retaddr); 302 v2 = cpu_ldub_kernel_ra(env, env->tr.base + old_tss_limit_max, retaddr); 303 cpu_stb_kernel_ra(env, env->tr.base, v1, retaddr); 304 cpu_stb_kernel_ra(env, env->tr.base + old_tss_limit_max, v2, retaddr); 305 306 /* clear busy bit (it is restartable) */ 307 if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) { 308 target_ulong ptr; 309 uint32_t e2; 310 311 ptr = env->gdt.base + (env->tr.selector & ~7); 312 e2 = cpu_ldl_kernel_ra(env, ptr + 4, retaddr); 313 e2 &= ~DESC_TSS_BUSY_MASK; 314 cpu_stl_kernel_ra(env, ptr + 4, e2, retaddr); 315 } 316 old_eflags = cpu_compute_eflags(env); 317 if (source == SWITCH_TSS_IRET) { 318 old_eflags &= ~NT_MASK; 319 } 320 321 /* save the current state in the old TSS */ 322 if (old_type & 8) { 323 /* 32 bit */ 324 cpu_stl_kernel_ra(env, env->tr.base + 0x20, next_eip, retaddr); 325 cpu_stl_kernel_ra(env, env->tr.base + 0x24, old_eflags, retaddr); 326 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 0 * 4), env->regs[R_EAX], retaddr); 327 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 1 * 4), env->regs[R_ECX], retaddr); 328 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 2 * 4), env->regs[R_EDX], retaddr); 329 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 3 * 4), env->regs[R_EBX], retaddr); 330 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 4 * 4), env->regs[R_ESP], retaddr); 331 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 5 * 4), env->regs[R_EBP], retaddr); 332 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 6 * 4), env->regs[R_ESI], retaddr); 333 cpu_stl_kernel_ra(env, env->tr.base + (0x28 + 7 * 4), env->regs[R_EDI], retaddr); 334 for (i = 0; i < 6; i++) { 335 cpu_stw_kernel_ra(env, env->tr.base + (0x48 + i * 4), 336 env->segs[i].selector, retaddr); 337 } 338 } else { 339 /* 16 bit */ 340 cpu_stw_kernel_ra(env, env->tr.base + 0x0e, next_eip, retaddr); 341 cpu_stw_kernel_ra(env, env->tr.base + 0x10, old_eflags, retaddr); 342 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 0 * 2), env->regs[R_EAX], retaddr); 343 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 1 * 2), env->regs[R_ECX], retaddr); 344 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 2 * 2), env->regs[R_EDX], retaddr); 345 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 3 * 2), env->regs[R_EBX], retaddr); 346 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 4 * 2), env->regs[R_ESP], retaddr); 347 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 5 * 2), env->regs[R_EBP], retaddr); 348 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 6 * 2), env->regs[R_ESI], retaddr); 349 cpu_stw_kernel_ra(env, env->tr.base + (0x12 + 7 * 2), env->regs[R_EDI], retaddr); 350 for (i = 0; i < 4; i++) { 351 cpu_stw_kernel_ra(env, env->tr.base + (0x22 + i * 2), 352 env->segs[i].selector, retaddr); 353 } 354 } 355 356 /* now if an exception occurs, it will occurs in the next task 357 context */ 358 359 if (source == SWITCH_TSS_CALL) { 360 cpu_stw_kernel_ra(env, tss_base, env->tr.selector, retaddr); 361 new_eflags |= NT_MASK; 362 } 363 364 /* set busy bit */ 365 if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) { 366 target_ulong ptr; 367 uint32_t e2; 368 369 ptr = env->gdt.base + (tss_selector & ~7); 370 e2 = cpu_ldl_kernel_ra(env, ptr + 4, retaddr); 371 e2 |= DESC_TSS_BUSY_MASK; 372 cpu_stl_kernel_ra(env, ptr + 4, e2, retaddr); 373 } 374 375 /* set the new CPU state */ 376 /* from this point, any exception which occurs can give problems */ 377 env->cr[0] |= CR0_TS_MASK; 378 env->hflags |= HF_TS_MASK; 379 env->tr.selector = tss_selector; 380 env->tr.base = tss_base; 381 env->tr.limit = tss_limit; 382 env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK; 383 384 if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) { 385 cpu_x86_update_cr3(env, new_cr3); 386 } 387 388 /* load all registers without an exception, then reload them with 389 possible exception */ 390 env->eip = new_eip; 391 eflags_mask = TF_MASK | AC_MASK | ID_MASK | 392 IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK; 393 if (type & 8) { 394 cpu_load_eflags(env, new_eflags, eflags_mask); 395 for (i = 0; i < 8; i++) { 396 env->regs[i] = new_regs[i]; 397 } 398 } else { 399 cpu_load_eflags(env, new_eflags, eflags_mask & 0xffff); 400 for (i = 0; i < 8; i++) { 401 env->regs[i] = (env->regs[i] & 0xffff0000) | new_regs[i]; 402 } 403 } 404 if (new_eflags & VM_MASK) { 405 for (i = 0; i < 6; i++) { 406 load_seg_vm(env, i, new_segs[i]); 407 } 408 } else { 409 /* first just selectors as the rest may trigger exceptions */ 410 for (i = 0; i < 6; i++) { 411 cpu_x86_load_seg_cache(env, i, new_segs[i], 0, 0, 0); 412 } 413 } 414 415 env->ldt.selector = new_ldt & ~4; 416 env->ldt.base = 0; 417 env->ldt.limit = 0; 418 env->ldt.flags = 0; 419 420 /* load the LDT */ 421 if (new_ldt & 4) { 422 raise_exception_err_ra(env, EXCP0A_TSS, new_ldt & 0xfffc, retaddr); 423 } 424 425 if ((new_ldt & 0xfffc) != 0) { 426 dt = &env->gdt; 427 index = new_ldt & ~7; 428 if ((index + 7) > dt->limit) { 429 raise_exception_err_ra(env, EXCP0A_TSS, new_ldt & 0xfffc, retaddr); 430 } 431 ptr = dt->base + index; 432 e1 = cpu_ldl_kernel_ra(env, ptr, retaddr); 433 e2 = cpu_ldl_kernel_ra(env, ptr + 4, retaddr); 434 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) { 435 raise_exception_err_ra(env, EXCP0A_TSS, new_ldt & 0xfffc, retaddr); 436 } 437 if (!(e2 & DESC_P_MASK)) { 438 raise_exception_err_ra(env, EXCP0A_TSS, new_ldt & 0xfffc, retaddr); 439 } 440 load_seg_cache_raw_dt(&env->ldt, e1, e2); 441 } 442 443 /* load the segments */ 444 if (!(new_eflags & VM_MASK)) { 445 int cpl = new_segs[R_CS] & 3; 446 tss_load_seg(env, R_CS, new_segs[R_CS], cpl, retaddr); 447 tss_load_seg(env, R_SS, new_segs[R_SS], cpl, retaddr); 448 tss_load_seg(env, R_ES, new_segs[R_ES], cpl, retaddr); 449 tss_load_seg(env, R_DS, new_segs[R_DS], cpl, retaddr); 450 tss_load_seg(env, R_FS, new_segs[R_FS], cpl, retaddr); 451 tss_load_seg(env, R_GS, new_segs[R_GS], cpl, retaddr); 452 } 453 454 /* check that env->eip is in the CS segment limits */ 455 if (new_eip > env->segs[R_CS].limit) { 456 /* XXX: different exception if CALL? */ 457 raise_exception_err_ra(env, EXCP0D_GPF, 0, retaddr); 458 } 459 460 #ifndef CONFIG_USER_ONLY 461 /* reset local breakpoints */ 462 if (env->dr[7] & DR7_LOCAL_BP_MASK) { 463 cpu_x86_update_dr7(env, env->dr[7] & ~DR7_LOCAL_BP_MASK); 464 } 465 #endif 466 } 467 468 static void switch_tss(CPUX86State *env, int tss_selector, 469 uint32_t e1, uint32_t e2, int source, 470 uint32_t next_eip) 471 { 472 switch_tss_ra(env, tss_selector, e1, e2, source, next_eip, 0); 473 } 474 475 static inline unsigned int get_sp_mask(unsigned int e2) 476 { 477 #ifdef TARGET_X86_64 478 if (e2 & DESC_L_MASK) { 479 return 0; 480 } else 481 #endif 482 if (e2 & DESC_B_MASK) { 483 return 0xffffffff; 484 } else { 485 return 0xffff; 486 } 487 } 488 489 int exception_has_error_code(int intno) 490 { 491 switch (intno) { 492 case 8: 493 case 10: 494 case 11: 495 case 12: 496 case 13: 497 case 14: 498 case 17: 499 return 1; 500 } 501 return 0; 502 } 503 504 #ifdef TARGET_X86_64 505 #define SET_ESP(val, sp_mask) \ 506 do { \ 507 if ((sp_mask) == 0xffff) { \ 508 env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | \ 509 ((val) & 0xffff); \ 510 } else if ((sp_mask) == 0xffffffffLL) { \ 511 env->regs[R_ESP] = (uint32_t)(val); \ 512 } else { \ 513 env->regs[R_ESP] = (val); \ 514 } \ 515 } while (0) 516 #else 517 #define SET_ESP(val, sp_mask) \ 518 do { \ 519 env->regs[R_ESP] = (env->regs[R_ESP] & ~(sp_mask)) | \ 520 ((val) & (sp_mask)); \ 521 } while (0) 522 #endif 523 524 /* in 64-bit machines, this can overflow. So this segment addition macro 525 * can be used to trim the value to 32-bit whenever needed */ 526 #define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask)))) 527 528 /* XXX: add a is_user flag to have proper security support */ 529 #define PUSHW_RA(ssp, sp, sp_mask, val, ra) \ 530 { \ 531 sp -= 2; \ 532 cpu_stw_kernel_ra(env, (ssp) + (sp & (sp_mask)), (val), ra); \ 533 } 534 535 #define PUSHL_RA(ssp, sp, sp_mask, val, ra) \ 536 { \ 537 sp -= 4; \ 538 cpu_stl_kernel_ra(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val), ra); \ 539 } 540 541 #define POPW_RA(ssp, sp, sp_mask, val, ra) \ 542 { \ 543 val = cpu_lduw_kernel_ra(env, (ssp) + (sp & (sp_mask)), ra); \ 544 sp += 2; \ 545 } 546 547 #define POPL_RA(ssp, sp, sp_mask, val, ra) \ 548 { \ 549 val = (uint32_t)cpu_ldl_kernel_ra(env, SEG_ADDL(ssp, sp, sp_mask), ra); \ 550 sp += 4; \ 551 } 552 553 #define PUSHW(ssp, sp, sp_mask, val) PUSHW_RA(ssp, sp, sp_mask, val, 0) 554 #define PUSHL(ssp, sp, sp_mask, val) PUSHL_RA(ssp, sp, sp_mask, val, 0) 555 #define POPW(ssp, sp, sp_mask, val) POPW_RA(ssp, sp, sp_mask, val, 0) 556 #define POPL(ssp, sp, sp_mask, val) POPL_RA(ssp, sp, sp_mask, val, 0) 557 558 /* protected mode interrupt */ 559 static void do_interrupt_protected(CPUX86State *env, int intno, int is_int, 560 int error_code, unsigned int next_eip, 561 int is_hw) 562 { 563 SegmentCache *dt; 564 target_ulong ptr, ssp; 565 int type, dpl, selector, ss_dpl, cpl; 566 int has_error_code, new_stack, shift; 567 uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0; 568 uint32_t old_eip, sp_mask; 569 int vm86 = env->eflags & VM_MASK; 570 571 has_error_code = 0; 572 if (!is_int && !is_hw) { 573 has_error_code = exception_has_error_code(intno); 574 } 575 if (is_int) { 576 old_eip = next_eip; 577 } else { 578 old_eip = env->eip; 579 } 580 581 dt = &env->idt; 582 if (intno * 8 + 7 > dt->limit) { 583 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); 584 } 585 ptr = dt->base + intno * 8; 586 e1 = cpu_ldl_kernel(env, ptr); 587 e2 = cpu_ldl_kernel(env, ptr + 4); 588 /* check gate type */ 589 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; 590 switch (type) { 591 case 5: /* task gate */ 592 case 6: /* 286 interrupt gate */ 593 case 7: /* 286 trap gate */ 594 case 14: /* 386 interrupt gate */ 595 case 15: /* 386 trap gate */ 596 break; 597 default: 598 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); 599 break; 600 } 601 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 602 cpl = env->hflags & HF_CPL_MASK; 603 /* check privilege if software int */ 604 if (is_int && dpl < cpl) { 605 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); 606 } 607 608 if (type == 5) { 609 /* task gate */ 610 /* must do that check here to return the correct error code */ 611 if (!(e2 & DESC_P_MASK)) { 612 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2); 613 } 614 switch_tss(env, intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip); 615 if (has_error_code) { 616 int type; 617 uint32_t mask; 618 619 /* push the error code */ 620 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf; 621 shift = type >> 3; 622 if (env->segs[R_SS].flags & DESC_B_MASK) { 623 mask = 0xffffffff; 624 } else { 625 mask = 0xffff; 626 } 627 esp = (env->regs[R_ESP] - (2 << shift)) & mask; 628 ssp = env->segs[R_SS].base + esp; 629 if (shift) { 630 cpu_stl_kernel(env, ssp, error_code); 631 } else { 632 cpu_stw_kernel(env, ssp, error_code); 633 } 634 SET_ESP(esp, mask); 635 } 636 return; 637 } 638 639 /* Otherwise, trap or interrupt gate */ 640 641 /* check valid bit */ 642 if (!(e2 & DESC_P_MASK)) { 643 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2); 644 } 645 selector = e1 >> 16; 646 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); 647 if ((selector & 0xfffc) == 0) { 648 raise_exception_err(env, EXCP0D_GPF, 0); 649 } 650 if (load_segment(env, &e1, &e2, selector) != 0) { 651 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 652 } 653 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { 654 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 655 } 656 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 657 if (dpl > cpl) { 658 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 659 } 660 if (!(e2 & DESC_P_MASK)) { 661 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); 662 } 663 if (e2 & DESC_C_MASK) { 664 dpl = cpl; 665 } 666 if (dpl < cpl) { 667 /* to inner privilege */ 668 get_ss_esp_from_tss(env, &ss, &esp, dpl, 0); 669 if ((ss & 0xfffc) == 0) { 670 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 671 } 672 if ((ss & 3) != dpl) { 673 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 674 } 675 if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) { 676 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 677 } 678 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; 679 if (ss_dpl != dpl) { 680 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 681 } 682 if (!(ss_e2 & DESC_S_MASK) || 683 (ss_e2 & DESC_CS_MASK) || 684 !(ss_e2 & DESC_W_MASK)) { 685 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 686 } 687 if (!(ss_e2 & DESC_P_MASK)) { 688 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc); 689 } 690 new_stack = 1; 691 sp_mask = get_sp_mask(ss_e2); 692 ssp = get_seg_base(ss_e1, ss_e2); 693 } else { 694 /* to same privilege */ 695 if (vm86) { 696 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 697 } 698 new_stack = 0; 699 sp_mask = get_sp_mask(env->segs[R_SS].flags); 700 ssp = env->segs[R_SS].base; 701 esp = env->regs[R_ESP]; 702 } 703 704 shift = type >> 3; 705 706 #if 0 707 /* XXX: check that enough room is available */ 708 push_size = 6 + (new_stack << 2) + (has_error_code << 1); 709 if (vm86) { 710 push_size += 8; 711 } 712 push_size <<= shift; 713 #endif 714 if (shift == 1) { 715 if (new_stack) { 716 if (vm86) { 717 PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector); 718 PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector); 719 PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector); 720 PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector); 721 } 722 PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector); 723 PUSHL(ssp, esp, sp_mask, env->regs[R_ESP]); 724 } 725 PUSHL(ssp, esp, sp_mask, cpu_compute_eflags(env)); 726 PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector); 727 PUSHL(ssp, esp, sp_mask, old_eip); 728 if (has_error_code) { 729 PUSHL(ssp, esp, sp_mask, error_code); 730 } 731 } else { 732 if (new_stack) { 733 if (vm86) { 734 PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector); 735 PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector); 736 PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector); 737 PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector); 738 } 739 PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector); 740 PUSHW(ssp, esp, sp_mask, env->regs[R_ESP]); 741 } 742 PUSHW(ssp, esp, sp_mask, cpu_compute_eflags(env)); 743 PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector); 744 PUSHW(ssp, esp, sp_mask, old_eip); 745 if (has_error_code) { 746 PUSHW(ssp, esp, sp_mask, error_code); 747 } 748 } 749 750 /* interrupt gate clear IF mask */ 751 if ((type & 1) == 0) { 752 env->eflags &= ~IF_MASK; 753 } 754 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK); 755 756 if (new_stack) { 757 if (vm86) { 758 cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0, 0); 759 cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0); 760 cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0); 761 cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0, 0); 762 } 763 ss = (ss & ~3) | dpl; 764 cpu_x86_load_seg_cache(env, R_SS, ss, 765 ssp, get_seg_limit(ss_e1, ss_e2), ss_e2); 766 } 767 SET_ESP(esp, sp_mask); 768 769 selector = (selector & ~3) | dpl; 770 cpu_x86_load_seg_cache(env, R_CS, selector, 771 get_seg_base(e1, e2), 772 get_seg_limit(e1, e2), 773 e2); 774 env->eip = offset; 775 } 776 777 #ifdef TARGET_X86_64 778 779 #define PUSHQ_RA(sp, val, ra) \ 780 { \ 781 sp -= 8; \ 782 cpu_stq_kernel_ra(env, sp, (val), ra); \ 783 } 784 785 #define POPQ_RA(sp, val, ra) \ 786 { \ 787 val = cpu_ldq_kernel_ra(env, sp, ra); \ 788 sp += 8; \ 789 } 790 791 #define PUSHQ(sp, val) PUSHQ_RA(sp, val, 0) 792 #define POPQ(sp, val) POPQ_RA(sp, val, 0) 793 794 static inline target_ulong get_rsp_from_tss(CPUX86State *env, int level) 795 { 796 X86CPU *cpu = env_archcpu(env); 797 int index; 798 799 #if 0 800 printf("TR: base=" TARGET_FMT_lx " limit=%x\n", 801 env->tr.base, env->tr.limit); 802 #endif 803 804 if (!(env->tr.flags & DESC_P_MASK)) { 805 cpu_abort(CPU(cpu), "invalid tss"); 806 } 807 index = 8 * level + 4; 808 if ((index + 7) > env->tr.limit) { 809 raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc); 810 } 811 return cpu_ldq_kernel(env, env->tr.base + index); 812 } 813 814 /* 64 bit interrupt */ 815 static void do_interrupt64(CPUX86State *env, int intno, int is_int, 816 int error_code, target_ulong next_eip, int is_hw) 817 { 818 SegmentCache *dt; 819 target_ulong ptr; 820 int type, dpl, selector, cpl, ist; 821 int has_error_code, new_stack; 822 uint32_t e1, e2, e3, ss; 823 target_ulong old_eip, esp, offset; 824 825 has_error_code = 0; 826 if (!is_int && !is_hw) { 827 has_error_code = exception_has_error_code(intno); 828 } 829 if (is_int) { 830 old_eip = next_eip; 831 } else { 832 old_eip = env->eip; 833 } 834 835 dt = &env->idt; 836 if (intno * 16 + 15 > dt->limit) { 837 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); 838 } 839 ptr = dt->base + intno * 16; 840 e1 = cpu_ldl_kernel(env, ptr); 841 e2 = cpu_ldl_kernel(env, ptr + 4); 842 e3 = cpu_ldl_kernel(env, ptr + 8); 843 /* check gate type */ 844 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; 845 switch (type) { 846 case 14: /* 386 interrupt gate */ 847 case 15: /* 386 trap gate */ 848 break; 849 default: 850 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); 851 break; 852 } 853 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 854 cpl = env->hflags & HF_CPL_MASK; 855 /* check privilege if software int */ 856 if (is_int && dpl < cpl) { 857 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2); 858 } 859 /* check valid bit */ 860 if (!(e2 & DESC_P_MASK)) { 861 raise_exception_err(env, EXCP0B_NOSEG, intno * 16 + 2); 862 } 863 selector = e1 >> 16; 864 offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff); 865 ist = e2 & 7; 866 if ((selector & 0xfffc) == 0) { 867 raise_exception_err(env, EXCP0D_GPF, 0); 868 } 869 870 if (load_segment(env, &e1, &e2, selector) != 0) { 871 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 872 } 873 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { 874 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 875 } 876 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 877 if (dpl > cpl) { 878 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 879 } 880 if (!(e2 & DESC_P_MASK)) { 881 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc); 882 } 883 if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK)) { 884 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 885 } 886 if (e2 & DESC_C_MASK) { 887 dpl = cpl; 888 } 889 if (dpl < cpl || ist != 0) { 890 /* to inner privilege */ 891 new_stack = 1; 892 esp = get_rsp_from_tss(env, ist != 0 ? ist + 3 : dpl); 893 ss = 0; 894 } else { 895 /* to same privilege */ 896 if (env->eflags & VM_MASK) { 897 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc); 898 } 899 new_stack = 0; 900 esp = env->regs[R_ESP]; 901 } 902 esp &= ~0xfLL; /* align stack */ 903 904 PUSHQ(esp, env->segs[R_SS].selector); 905 PUSHQ(esp, env->regs[R_ESP]); 906 PUSHQ(esp, cpu_compute_eflags(env)); 907 PUSHQ(esp, env->segs[R_CS].selector); 908 PUSHQ(esp, old_eip); 909 if (has_error_code) { 910 PUSHQ(esp, error_code); 911 } 912 913 /* interrupt gate clear IF mask */ 914 if ((type & 1) == 0) { 915 env->eflags &= ~IF_MASK; 916 } 917 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK); 918 919 if (new_stack) { 920 ss = 0 | dpl; 921 cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, dpl << DESC_DPL_SHIFT); 922 } 923 env->regs[R_ESP] = esp; 924 925 selector = (selector & ~3) | dpl; 926 cpu_x86_load_seg_cache(env, R_CS, selector, 927 get_seg_base(e1, e2), 928 get_seg_limit(e1, e2), 929 e2); 930 env->eip = offset; 931 } 932 933 void helper_sysret(CPUX86State *env, int dflag) 934 { 935 int cpl, selector; 936 937 if (!(env->efer & MSR_EFER_SCE)) { 938 raise_exception_err_ra(env, EXCP06_ILLOP, 0, GETPC()); 939 } 940 cpl = env->hflags & HF_CPL_MASK; 941 if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) { 942 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 943 } 944 selector = (env->star >> 48) & 0xffff; 945 if (env->hflags & HF_LMA_MASK) { 946 cpu_load_eflags(env, (uint32_t)(env->regs[11]), TF_MASK | AC_MASK 947 | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | 948 NT_MASK); 949 if (dflag == 2) { 950 cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3, 951 0, 0xffffffff, 952 DESC_G_MASK | DESC_P_MASK | 953 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 954 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | 955 DESC_L_MASK); 956 env->eip = env->regs[R_ECX]; 957 } else { 958 cpu_x86_load_seg_cache(env, R_CS, selector | 3, 959 0, 0xffffffff, 960 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 961 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 962 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); 963 env->eip = (uint32_t)env->regs[R_ECX]; 964 } 965 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) | 3, 966 0, 0xffffffff, 967 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 968 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 969 DESC_W_MASK | DESC_A_MASK); 970 } else { 971 env->eflags |= IF_MASK; 972 cpu_x86_load_seg_cache(env, R_CS, selector | 3, 973 0, 0xffffffff, 974 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 975 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 976 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); 977 env->eip = (uint32_t)env->regs[R_ECX]; 978 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) | 3, 979 0, 0xffffffff, 980 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 981 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 982 DESC_W_MASK | DESC_A_MASK); 983 } 984 } 985 #endif /* TARGET_X86_64 */ 986 987 /* real mode interrupt */ 988 static void do_interrupt_real(CPUX86State *env, int intno, int is_int, 989 int error_code, unsigned int next_eip) 990 { 991 SegmentCache *dt; 992 target_ulong ptr, ssp; 993 int selector; 994 uint32_t offset, esp; 995 uint32_t old_cs, old_eip; 996 997 /* real mode (simpler!) */ 998 dt = &env->idt; 999 if (intno * 4 + 3 > dt->limit) { 1000 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2); 1001 } 1002 ptr = dt->base + intno * 4; 1003 offset = cpu_lduw_kernel(env, ptr); 1004 selector = cpu_lduw_kernel(env, ptr + 2); 1005 esp = env->regs[R_ESP]; 1006 ssp = env->segs[R_SS].base; 1007 if (is_int) { 1008 old_eip = next_eip; 1009 } else { 1010 old_eip = env->eip; 1011 } 1012 old_cs = env->segs[R_CS].selector; 1013 /* XXX: use SS segment size? */ 1014 PUSHW(ssp, esp, 0xffff, cpu_compute_eflags(env)); 1015 PUSHW(ssp, esp, 0xffff, old_cs); 1016 PUSHW(ssp, esp, 0xffff, old_eip); 1017 1018 /* update processor state */ 1019 env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | (esp & 0xffff); 1020 env->eip = offset; 1021 env->segs[R_CS].selector = selector; 1022 env->segs[R_CS].base = (selector << 4); 1023 env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK); 1024 } 1025 1026 /* 1027 * Begin execution of an interruption. is_int is TRUE if coming from 1028 * the int instruction. next_eip is the env->eip value AFTER the interrupt 1029 * instruction. It is only relevant if is_int is TRUE. 1030 */ 1031 void do_interrupt_all(X86CPU *cpu, int intno, int is_int, 1032 int error_code, target_ulong next_eip, int is_hw) 1033 { 1034 CPUX86State *env = &cpu->env; 1035 1036 if (qemu_loglevel_mask(CPU_LOG_INT)) { 1037 if ((env->cr[0] & CR0_PE_MASK)) { 1038 static int count; 1039 1040 qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx 1041 " pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx, 1042 count, intno, error_code, is_int, 1043 env->hflags & HF_CPL_MASK, 1044 env->segs[R_CS].selector, env->eip, 1045 (int)env->segs[R_CS].base + env->eip, 1046 env->segs[R_SS].selector, env->regs[R_ESP]); 1047 if (intno == 0x0e) { 1048 qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]); 1049 } else { 1050 qemu_log(" env->regs[R_EAX]=" TARGET_FMT_lx, env->regs[R_EAX]); 1051 } 1052 qemu_log("\n"); 1053 log_cpu_state(CPU(cpu), CPU_DUMP_CCOP); 1054 #if 0 1055 { 1056 int i; 1057 target_ulong ptr; 1058 1059 qemu_log(" code="); 1060 ptr = env->segs[R_CS].base + env->eip; 1061 for (i = 0; i < 16; i++) { 1062 qemu_log(" %02x", ldub(ptr + i)); 1063 } 1064 qemu_log("\n"); 1065 } 1066 #endif 1067 count++; 1068 } 1069 } 1070 if (env->cr[0] & CR0_PE_MASK) { 1071 #if !defined(CONFIG_USER_ONLY) 1072 if (env->hflags & HF_GUEST_MASK) { 1073 handle_even_inj(env, intno, is_int, error_code, is_hw, 0); 1074 } 1075 #endif 1076 #ifdef TARGET_X86_64 1077 if (env->hflags & HF_LMA_MASK) { 1078 do_interrupt64(env, intno, is_int, error_code, next_eip, is_hw); 1079 } else 1080 #endif 1081 { 1082 do_interrupt_protected(env, intno, is_int, error_code, next_eip, 1083 is_hw); 1084 } 1085 } else { 1086 #if !defined(CONFIG_USER_ONLY) 1087 if (env->hflags & HF_GUEST_MASK) { 1088 handle_even_inj(env, intno, is_int, error_code, is_hw, 1); 1089 } 1090 #endif 1091 do_interrupt_real(env, intno, is_int, error_code, next_eip); 1092 } 1093 1094 #if !defined(CONFIG_USER_ONLY) 1095 if (env->hflags & HF_GUEST_MASK) { 1096 CPUState *cs = CPU(cpu); 1097 uint32_t event_inj = x86_ldl_phys(cs, env->vm_vmcb + 1098 offsetof(struct vmcb, 1099 control.event_inj)); 1100 1101 x86_stl_phys(cs, 1102 env->vm_vmcb + offsetof(struct vmcb, control.event_inj), 1103 event_inj & ~SVM_EVTINJ_VALID); 1104 } 1105 #endif 1106 } 1107 1108 void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw) 1109 { 1110 do_interrupt_all(env_archcpu(env), intno, 0, 0, 0, is_hw); 1111 } 1112 1113 void helper_lldt(CPUX86State *env, int selector) 1114 { 1115 SegmentCache *dt; 1116 uint32_t e1, e2; 1117 int index, entry_limit; 1118 target_ulong ptr; 1119 1120 selector &= 0xffff; 1121 if ((selector & 0xfffc) == 0) { 1122 /* XXX: NULL selector case: invalid LDT */ 1123 env->ldt.base = 0; 1124 env->ldt.limit = 0; 1125 } else { 1126 if (selector & 0x4) { 1127 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1128 } 1129 dt = &env->gdt; 1130 index = selector & ~7; 1131 #ifdef TARGET_X86_64 1132 if (env->hflags & HF_LMA_MASK) { 1133 entry_limit = 15; 1134 } else 1135 #endif 1136 { 1137 entry_limit = 7; 1138 } 1139 if ((index + entry_limit) > dt->limit) { 1140 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1141 } 1142 ptr = dt->base + index; 1143 e1 = cpu_ldl_kernel_ra(env, ptr, GETPC()); 1144 e2 = cpu_ldl_kernel_ra(env, ptr + 4, GETPC()); 1145 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) { 1146 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1147 } 1148 if (!(e2 & DESC_P_MASK)) { 1149 raise_exception_err_ra(env, EXCP0B_NOSEG, selector & 0xfffc, GETPC()); 1150 } 1151 #ifdef TARGET_X86_64 1152 if (env->hflags & HF_LMA_MASK) { 1153 uint32_t e3; 1154 1155 e3 = cpu_ldl_kernel_ra(env, ptr + 8, GETPC()); 1156 load_seg_cache_raw_dt(&env->ldt, e1, e2); 1157 env->ldt.base |= (target_ulong)e3 << 32; 1158 } else 1159 #endif 1160 { 1161 load_seg_cache_raw_dt(&env->ldt, e1, e2); 1162 } 1163 } 1164 env->ldt.selector = selector; 1165 } 1166 1167 void helper_ltr(CPUX86State *env, int selector) 1168 { 1169 SegmentCache *dt; 1170 uint32_t e1, e2; 1171 int index, type, entry_limit; 1172 target_ulong ptr; 1173 1174 selector &= 0xffff; 1175 if ((selector & 0xfffc) == 0) { 1176 /* NULL selector case: invalid TR */ 1177 env->tr.base = 0; 1178 env->tr.limit = 0; 1179 env->tr.flags = 0; 1180 } else { 1181 if (selector & 0x4) { 1182 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1183 } 1184 dt = &env->gdt; 1185 index = selector & ~7; 1186 #ifdef TARGET_X86_64 1187 if (env->hflags & HF_LMA_MASK) { 1188 entry_limit = 15; 1189 } else 1190 #endif 1191 { 1192 entry_limit = 7; 1193 } 1194 if ((index + entry_limit) > dt->limit) { 1195 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1196 } 1197 ptr = dt->base + index; 1198 e1 = cpu_ldl_kernel_ra(env, ptr, GETPC()); 1199 e2 = cpu_ldl_kernel_ra(env, ptr + 4, GETPC()); 1200 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 1201 if ((e2 & DESC_S_MASK) || 1202 (type != 1 && type != 9)) { 1203 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1204 } 1205 if (!(e2 & DESC_P_MASK)) { 1206 raise_exception_err_ra(env, EXCP0B_NOSEG, selector & 0xfffc, GETPC()); 1207 } 1208 #ifdef TARGET_X86_64 1209 if (env->hflags & HF_LMA_MASK) { 1210 uint32_t e3, e4; 1211 1212 e3 = cpu_ldl_kernel_ra(env, ptr + 8, GETPC()); 1213 e4 = cpu_ldl_kernel_ra(env, ptr + 12, GETPC()); 1214 if ((e4 >> DESC_TYPE_SHIFT) & 0xf) { 1215 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1216 } 1217 load_seg_cache_raw_dt(&env->tr, e1, e2); 1218 env->tr.base |= (target_ulong)e3 << 32; 1219 } else 1220 #endif 1221 { 1222 load_seg_cache_raw_dt(&env->tr, e1, e2); 1223 } 1224 e2 |= DESC_TSS_BUSY_MASK; 1225 cpu_stl_kernel_ra(env, ptr + 4, e2, GETPC()); 1226 } 1227 env->tr.selector = selector; 1228 } 1229 1230 /* only works if protected mode and not VM86. seg_reg must be != R_CS */ 1231 void helper_load_seg(CPUX86State *env, int seg_reg, int selector) 1232 { 1233 uint32_t e1, e2; 1234 int cpl, dpl, rpl; 1235 SegmentCache *dt; 1236 int index; 1237 target_ulong ptr; 1238 1239 selector &= 0xffff; 1240 cpl = env->hflags & HF_CPL_MASK; 1241 if ((selector & 0xfffc) == 0) { 1242 /* null selector case */ 1243 if (seg_reg == R_SS 1244 #ifdef TARGET_X86_64 1245 && (!(env->hflags & HF_CS64_MASK) || cpl == 3) 1246 #endif 1247 ) { 1248 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1249 } 1250 cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0); 1251 } else { 1252 1253 if (selector & 0x4) { 1254 dt = &env->ldt; 1255 } else { 1256 dt = &env->gdt; 1257 } 1258 index = selector & ~7; 1259 if ((index + 7) > dt->limit) { 1260 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1261 } 1262 ptr = dt->base + index; 1263 e1 = cpu_ldl_kernel_ra(env, ptr, GETPC()); 1264 e2 = cpu_ldl_kernel_ra(env, ptr + 4, GETPC()); 1265 1266 if (!(e2 & DESC_S_MASK)) { 1267 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1268 } 1269 rpl = selector & 3; 1270 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1271 if (seg_reg == R_SS) { 1272 /* must be writable segment */ 1273 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) { 1274 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1275 } 1276 if (rpl != cpl || dpl != cpl) { 1277 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1278 } 1279 } else { 1280 /* must be readable segment */ 1281 if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) { 1282 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1283 } 1284 1285 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) { 1286 /* if not conforming code, test rights */ 1287 if (dpl < cpl || dpl < rpl) { 1288 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1289 } 1290 } 1291 } 1292 1293 if (!(e2 & DESC_P_MASK)) { 1294 if (seg_reg == R_SS) { 1295 raise_exception_err_ra(env, EXCP0C_STACK, selector & 0xfffc, GETPC()); 1296 } else { 1297 raise_exception_err_ra(env, EXCP0B_NOSEG, selector & 0xfffc, GETPC()); 1298 } 1299 } 1300 1301 /* set the access bit if not already set */ 1302 if (!(e2 & DESC_A_MASK)) { 1303 e2 |= DESC_A_MASK; 1304 cpu_stl_kernel_ra(env, ptr + 4, e2, GETPC()); 1305 } 1306 1307 cpu_x86_load_seg_cache(env, seg_reg, selector, 1308 get_seg_base(e1, e2), 1309 get_seg_limit(e1, e2), 1310 e2); 1311 #if 0 1312 qemu_log("load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n", 1313 selector, (unsigned long)sc->base, sc->limit, sc->flags); 1314 #endif 1315 } 1316 } 1317 1318 /* protected mode jump */ 1319 void helper_ljmp_protected(CPUX86State *env, int new_cs, target_ulong new_eip, 1320 target_ulong next_eip) 1321 { 1322 int gate_cs, type; 1323 uint32_t e1, e2, cpl, dpl, rpl, limit; 1324 1325 if ((new_cs & 0xfffc) == 0) { 1326 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1327 } 1328 if (load_segment_ra(env, &e1, &e2, new_cs, GETPC()) != 0) { 1329 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1330 } 1331 cpl = env->hflags & HF_CPL_MASK; 1332 if (e2 & DESC_S_MASK) { 1333 if (!(e2 & DESC_CS_MASK)) { 1334 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1335 } 1336 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1337 if (e2 & DESC_C_MASK) { 1338 /* conforming code segment */ 1339 if (dpl > cpl) { 1340 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1341 } 1342 } else { 1343 /* non conforming code segment */ 1344 rpl = new_cs & 3; 1345 if (rpl > cpl) { 1346 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1347 } 1348 if (dpl != cpl) { 1349 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1350 } 1351 } 1352 if (!(e2 & DESC_P_MASK)) { 1353 raise_exception_err_ra(env, EXCP0B_NOSEG, new_cs & 0xfffc, GETPC()); 1354 } 1355 limit = get_seg_limit(e1, e2); 1356 if (new_eip > limit && 1357 (!(env->hflags & HF_LMA_MASK) || !(e2 & DESC_L_MASK))) { 1358 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1359 } 1360 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, 1361 get_seg_base(e1, e2), limit, e2); 1362 env->eip = new_eip; 1363 } else { 1364 /* jump to call or task gate */ 1365 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1366 rpl = new_cs & 3; 1367 cpl = env->hflags & HF_CPL_MASK; 1368 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 1369 1370 #ifdef TARGET_X86_64 1371 if (env->efer & MSR_EFER_LMA) { 1372 if (type != 12) { 1373 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1374 } 1375 } 1376 #endif 1377 switch (type) { 1378 case 1: /* 286 TSS */ 1379 case 9: /* 386 TSS */ 1380 case 5: /* task gate */ 1381 if (dpl < cpl || dpl < rpl) { 1382 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1383 } 1384 switch_tss_ra(env, new_cs, e1, e2, SWITCH_TSS_JMP, next_eip, GETPC()); 1385 break; 1386 case 4: /* 286 call gate */ 1387 case 12: /* 386 call gate */ 1388 if ((dpl < cpl) || (dpl < rpl)) { 1389 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1390 } 1391 if (!(e2 & DESC_P_MASK)) { 1392 raise_exception_err_ra(env, EXCP0B_NOSEG, new_cs & 0xfffc, GETPC()); 1393 } 1394 gate_cs = e1 >> 16; 1395 new_eip = (e1 & 0xffff); 1396 if (type == 12) { 1397 new_eip |= (e2 & 0xffff0000); 1398 } 1399 1400 #ifdef TARGET_X86_64 1401 if (env->efer & MSR_EFER_LMA) { 1402 /* load the upper 8 bytes of the 64-bit call gate */ 1403 if (load_segment_ra(env, &e1, &e2, new_cs + 8, GETPC())) { 1404 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, 1405 GETPC()); 1406 } 1407 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; 1408 if (type != 0) { 1409 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, 1410 GETPC()); 1411 } 1412 new_eip |= ((target_ulong)e1) << 32; 1413 } 1414 #endif 1415 1416 if (load_segment_ra(env, &e1, &e2, gate_cs, GETPC()) != 0) { 1417 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1418 } 1419 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1420 /* must be code segment */ 1421 if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) != 1422 (DESC_S_MASK | DESC_CS_MASK))) { 1423 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1424 } 1425 if (((e2 & DESC_C_MASK) && (dpl > cpl)) || 1426 (!(e2 & DESC_C_MASK) && (dpl != cpl))) { 1427 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1428 } 1429 #ifdef TARGET_X86_64 1430 if (env->efer & MSR_EFER_LMA) { 1431 if (!(e2 & DESC_L_MASK)) { 1432 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1433 } 1434 if (e2 & DESC_B_MASK) { 1435 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1436 } 1437 } 1438 #endif 1439 if (!(e2 & DESC_P_MASK)) { 1440 raise_exception_err_ra(env, EXCP0D_GPF, gate_cs & 0xfffc, GETPC()); 1441 } 1442 limit = get_seg_limit(e1, e2); 1443 if (new_eip > limit && 1444 (!(env->hflags & HF_LMA_MASK) || !(e2 & DESC_L_MASK))) { 1445 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1446 } 1447 cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl, 1448 get_seg_base(e1, e2), limit, e2); 1449 env->eip = new_eip; 1450 break; 1451 default: 1452 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1453 break; 1454 } 1455 } 1456 } 1457 1458 /* real mode call */ 1459 void helper_lcall_real(CPUX86State *env, int new_cs, target_ulong new_eip1, 1460 int shift, int next_eip) 1461 { 1462 int new_eip; 1463 uint32_t esp, esp_mask; 1464 target_ulong ssp; 1465 1466 new_eip = new_eip1; 1467 esp = env->regs[R_ESP]; 1468 esp_mask = get_sp_mask(env->segs[R_SS].flags); 1469 ssp = env->segs[R_SS].base; 1470 if (shift) { 1471 PUSHL_RA(ssp, esp, esp_mask, env->segs[R_CS].selector, GETPC()); 1472 PUSHL_RA(ssp, esp, esp_mask, next_eip, GETPC()); 1473 } else { 1474 PUSHW_RA(ssp, esp, esp_mask, env->segs[R_CS].selector, GETPC()); 1475 PUSHW_RA(ssp, esp, esp_mask, next_eip, GETPC()); 1476 } 1477 1478 SET_ESP(esp, esp_mask); 1479 env->eip = new_eip; 1480 env->segs[R_CS].selector = new_cs; 1481 env->segs[R_CS].base = (new_cs << 4); 1482 } 1483 1484 /* protected mode call */ 1485 void helper_lcall_protected(CPUX86State *env, int new_cs, target_ulong new_eip, 1486 int shift, target_ulong next_eip) 1487 { 1488 int new_stack, i; 1489 uint32_t e1, e2, cpl, dpl, rpl, selector, param_count; 1490 uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, type, ss_dpl, sp_mask; 1491 uint32_t val, limit, old_sp_mask; 1492 target_ulong ssp, old_ssp, offset, sp; 1493 1494 LOG_PCALL("lcall %04x:" TARGET_FMT_lx " s=%d\n", new_cs, new_eip, shift); 1495 LOG_PCALL_STATE(env_cpu(env)); 1496 if ((new_cs & 0xfffc) == 0) { 1497 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1498 } 1499 if (load_segment_ra(env, &e1, &e2, new_cs, GETPC()) != 0) { 1500 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1501 } 1502 cpl = env->hflags & HF_CPL_MASK; 1503 LOG_PCALL("desc=%08x:%08x\n", e1, e2); 1504 if (e2 & DESC_S_MASK) { 1505 if (!(e2 & DESC_CS_MASK)) { 1506 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1507 } 1508 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1509 if (e2 & DESC_C_MASK) { 1510 /* conforming code segment */ 1511 if (dpl > cpl) { 1512 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1513 } 1514 } else { 1515 /* non conforming code segment */ 1516 rpl = new_cs & 3; 1517 if (rpl > cpl) { 1518 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1519 } 1520 if (dpl != cpl) { 1521 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1522 } 1523 } 1524 if (!(e2 & DESC_P_MASK)) { 1525 raise_exception_err_ra(env, EXCP0B_NOSEG, new_cs & 0xfffc, GETPC()); 1526 } 1527 1528 #ifdef TARGET_X86_64 1529 /* XXX: check 16/32 bit cases in long mode */ 1530 if (shift == 2) { 1531 target_ulong rsp; 1532 1533 /* 64 bit case */ 1534 rsp = env->regs[R_ESP]; 1535 PUSHQ_RA(rsp, env->segs[R_CS].selector, GETPC()); 1536 PUSHQ_RA(rsp, next_eip, GETPC()); 1537 /* from this point, not restartable */ 1538 env->regs[R_ESP] = rsp; 1539 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, 1540 get_seg_base(e1, e2), 1541 get_seg_limit(e1, e2), e2); 1542 env->eip = new_eip; 1543 } else 1544 #endif 1545 { 1546 sp = env->regs[R_ESP]; 1547 sp_mask = get_sp_mask(env->segs[R_SS].flags); 1548 ssp = env->segs[R_SS].base; 1549 if (shift) { 1550 PUSHL_RA(ssp, sp, sp_mask, env->segs[R_CS].selector, GETPC()); 1551 PUSHL_RA(ssp, sp, sp_mask, next_eip, GETPC()); 1552 } else { 1553 PUSHW_RA(ssp, sp, sp_mask, env->segs[R_CS].selector, GETPC()); 1554 PUSHW_RA(ssp, sp, sp_mask, next_eip, GETPC()); 1555 } 1556 1557 limit = get_seg_limit(e1, e2); 1558 if (new_eip > limit) { 1559 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1560 } 1561 /* from this point, not restartable */ 1562 SET_ESP(sp, sp_mask); 1563 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl, 1564 get_seg_base(e1, e2), limit, e2); 1565 env->eip = new_eip; 1566 } 1567 } else { 1568 /* check gate type */ 1569 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; 1570 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1571 rpl = new_cs & 3; 1572 1573 #ifdef TARGET_X86_64 1574 if (env->efer & MSR_EFER_LMA) { 1575 if (type != 12) { 1576 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1577 } 1578 } 1579 #endif 1580 1581 switch (type) { 1582 case 1: /* available 286 TSS */ 1583 case 9: /* available 386 TSS */ 1584 case 5: /* task gate */ 1585 if (dpl < cpl || dpl < rpl) { 1586 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1587 } 1588 switch_tss_ra(env, new_cs, e1, e2, SWITCH_TSS_CALL, next_eip, GETPC()); 1589 return; 1590 case 4: /* 286 call gate */ 1591 case 12: /* 386 call gate */ 1592 break; 1593 default: 1594 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1595 break; 1596 } 1597 shift = type >> 3; 1598 1599 if (dpl < cpl || dpl < rpl) { 1600 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, GETPC()); 1601 } 1602 /* check valid bit */ 1603 if (!(e2 & DESC_P_MASK)) { 1604 raise_exception_err_ra(env, EXCP0B_NOSEG, new_cs & 0xfffc, GETPC()); 1605 } 1606 selector = e1 >> 16; 1607 param_count = e2 & 0x1f; 1608 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff); 1609 #ifdef TARGET_X86_64 1610 if (env->efer & MSR_EFER_LMA) { 1611 /* load the upper 8 bytes of the 64-bit call gate */ 1612 if (load_segment_ra(env, &e1, &e2, new_cs + 8, GETPC())) { 1613 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, 1614 GETPC()); 1615 } 1616 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f; 1617 if (type != 0) { 1618 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, 1619 GETPC()); 1620 } 1621 offset |= ((target_ulong)e1) << 32; 1622 } 1623 #endif 1624 if ((selector & 0xfffc) == 0) { 1625 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 1626 } 1627 1628 if (load_segment_ra(env, &e1, &e2, selector, GETPC()) != 0) { 1629 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1630 } 1631 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) { 1632 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1633 } 1634 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1635 if (dpl > cpl) { 1636 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1637 } 1638 #ifdef TARGET_X86_64 1639 if (env->efer & MSR_EFER_LMA) { 1640 if (!(e2 & DESC_L_MASK)) { 1641 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1642 } 1643 if (e2 & DESC_B_MASK) { 1644 raise_exception_err_ra(env, EXCP0D_GPF, selector & 0xfffc, GETPC()); 1645 } 1646 shift++; 1647 } 1648 #endif 1649 if (!(e2 & DESC_P_MASK)) { 1650 raise_exception_err_ra(env, EXCP0B_NOSEG, selector & 0xfffc, GETPC()); 1651 } 1652 1653 if (!(e2 & DESC_C_MASK) && dpl < cpl) { 1654 /* to inner privilege */ 1655 #ifdef TARGET_X86_64 1656 if (shift == 2) { 1657 sp = get_rsp_from_tss(env, dpl); 1658 ss = dpl; /* SS = NULL selector with RPL = new CPL */ 1659 new_stack = 1; 1660 sp_mask = 0; 1661 ssp = 0; /* SS base is always zero in IA-32e mode */ 1662 LOG_PCALL("new ss:rsp=%04x:%016llx env->regs[R_ESP]=" 1663 TARGET_FMT_lx "\n", ss, sp, env->regs[R_ESP]); 1664 } else 1665 #endif 1666 { 1667 uint32_t sp32; 1668 get_ss_esp_from_tss(env, &ss, &sp32, dpl, GETPC()); 1669 LOG_PCALL("new ss:esp=%04x:%08x param_count=%d env->regs[R_ESP]=" 1670 TARGET_FMT_lx "\n", ss, sp32, param_count, 1671 env->regs[R_ESP]); 1672 sp = sp32; 1673 if ((ss & 0xfffc) == 0) { 1674 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1675 } 1676 if ((ss & 3) != dpl) { 1677 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1678 } 1679 if (load_segment_ra(env, &ss_e1, &ss_e2, ss, GETPC()) != 0) { 1680 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1681 } 1682 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; 1683 if (ss_dpl != dpl) { 1684 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1685 } 1686 if (!(ss_e2 & DESC_S_MASK) || 1687 (ss_e2 & DESC_CS_MASK) || 1688 !(ss_e2 & DESC_W_MASK)) { 1689 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1690 } 1691 if (!(ss_e2 & DESC_P_MASK)) { 1692 raise_exception_err_ra(env, EXCP0A_TSS, ss & 0xfffc, GETPC()); 1693 } 1694 1695 sp_mask = get_sp_mask(ss_e2); 1696 ssp = get_seg_base(ss_e1, ss_e2); 1697 } 1698 1699 /* push_size = ((param_count * 2) + 8) << shift; */ 1700 1701 old_sp_mask = get_sp_mask(env->segs[R_SS].flags); 1702 old_ssp = env->segs[R_SS].base; 1703 #ifdef TARGET_X86_64 1704 if (shift == 2) { 1705 /* XXX: verify if new stack address is canonical */ 1706 PUSHQ_RA(sp, env->segs[R_SS].selector, GETPC()); 1707 PUSHQ_RA(sp, env->regs[R_ESP], GETPC()); 1708 /* parameters aren't supported for 64-bit call gates */ 1709 } else 1710 #endif 1711 if (shift == 1) { 1712 PUSHL_RA(ssp, sp, sp_mask, env->segs[R_SS].selector, GETPC()); 1713 PUSHL_RA(ssp, sp, sp_mask, env->regs[R_ESP], GETPC()); 1714 for (i = param_count - 1; i >= 0; i--) { 1715 val = cpu_ldl_kernel_ra(env, old_ssp + 1716 ((env->regs[R_ESP] + i * 4) & 1717 old_sp_mask), GETPC()); 1718 PUSHL_RA(ssp, sp, sp_mask, val, GETPC()); 1719 } 1720 } else { 1721 PUSHW_RA(ssp, sp, sp_mask, env->segs[R_SS].selector, GETPC()); 1722 PUSHW_RA(ssp, sp, sp_mask, env->regs[R_ESP], GETPC()); 1723 for (i = param_count - 1; i >= 0; i--) { 1724 val = cpu_lduw_kernel_ra(env, old_ssp + 1725 ((env->regs[R_ESP] + i * 2) & 1726 old_sp_mask), GETPC()); 1727 PUSHW_RA(ssp, sp, sp_mask, val, GETPC()); 1728 } 1729 } 1730 new_stack = 1; 1731 } else { 1732 /* to same privilege */ 1733 sp = env->regs[R_ESP]; 1734 sp_mask = get_sp_mask(env->segs[R_SS].flags); 1735 ssp = env->segs[R_SS].base; 1736 /* push_size = (4 << shift); */ 1737 new_stack = 0; 1738 } 1739 1740 #ifdef TARGET_X86_64 1741 if (shift == 2) { 1742 PUSHQ_RA(sp, env->segs[R_CS].selector, GETPC()); 1743 PUSHQ_RA(sp, next_eip, GETPC()); 1744 } else 1745 #endif 1746 if (shift == 1) { 1747 PUSHL_RA(ssp, sp, sp_mask, env->segs[R_CS].selector, GETPC()); 1748 PUSHL_RA(ssp, sp, sp_mask, next_eip, GETPC()); 1749 } else { 1750 PUSHW_RA(ssp, sp, sp_mask, env->segs[R_CS].selector, GETPC()); 1751 PUSHW_RA(ssp, sp, sp_mask, next_eip, GETPC()); 1752 } 1753 1754 /* from this point, not restartable */ 1755 1756 if (new_stack) { 1757 #ifdef TARGET_X86_64 1758 if (shift == 2) { 1759 cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0); 1760 } else 1761 #endif 1762 { 1763 ss = (ss & ~3) | dpl; 1764 cpu_x86_load_seg_cache(env, R_SS, ss, 1765 ssp, 1766 get_seg_limit(ss_e1, ss_e2), 1767 ss_e2); 1768 } 1769 } 1770 1771 selector = (selector & ~3) | dpl; 1772 cpu_x86_load_seg_cache(env, R_CS, selector, 1773 get_seg_base(e1, e2), 1774 get_seg_limit(e1, e2), 1775 e2); 1776 SET_ESP(sp, sp_mask); 1777 env->eip = offset; 1778 } 1779 } 1780 1781 /* real and vm86 mode iret */ 1782 void helper_iret_real(CPUX86State *env, int shift) 1783 { 1784 uint32_t sp, new_cs, new_eip, new_eflags, sp_mask; 1785 target_ulong ssp; 1786 int eflags_mask; 1787 1788 sp_mask = 0xffff; /* XXXX: use SS segment size? */ 1789 sp = env->regs[R_ESP]; 1790 ssp = env->segs[R_SS].base; 1791 if (shift == 1) { 1792 /* 32 bits */ 1793 POPL_RA(ssp, sp, sp_mask, new_eip, GETPC()); 1794 POPL_RA(ssp, sp, sp_mask, new_cs, GETPC()); 1795 new_cs &= 0xffff; 1796 POPL_RA(ssp, sp, sp_mask, new_eflags, GETPC()); 1797 } else { 1798 /* 16 bits */ 1799 POPW_RA(ssp, sp, sp_mask, new_eip, GETPC()); 1800 POPW_RA(ssp, sp, sp_mask, new_cs, GETPC()); 1801 POPW_RA(ssp, sp, sp_mask, new_eflags, GETPC()); 1802 } 1803 env->regs[R_ESP] = (env->regs[R_ESP] & ~sp_mask) | (sp & sp_mask); 1804 env->segs[R_CS].selector = new_cs; 1805 env->segs[R_CS].base = (new_cs << 4); 1806 env->eip = new_eip; 1807 if (env->eflags & VM_MASK) { 1808 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK | 1809 NT_MASK; 1810 } else { 1811 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK | 1812 RF_MASK | NT_MASK; 1813 } 1814 if (shift == 0) { 1815 eflags_mask &= 0xffff; 1816 } 1817 cpu_load_eflags(env, new_eflags, eflags_mask); 1818 env->hflags2 &= ~HF2_NMI_MASK; 1819 } 1820 1821 static inline void validate_seg(CPUX86State *env, X86Seg seg_reg, int cpl) 1822 { 1823 int dpl; 1824 uint32_t e2; 1825 1826 /* XXX: on x86_64, we do not want to nullify FS and GS because 1827 they may still contain a valid base. I would be interested to 1828 know how a real x86_64 CPU behaves */ 1829 if ((seg_reg == R_FS || seg_reg == R_GS) && 1830 (env->segs[seg_reg].selector & 0xfffc) == 0) { 1831 return; 1832 } 1833 1834 e2 = env->segs[seg_reg].flags; 1835 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1836 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) { 1837 /* data or non conforming code segment */ 1838 if (dpl < cpl) { 1839 cpu_x86_load_seg_cache(env, seg_reg, 0, 1840 env->segs[seg_reg].base, 1841 env->segs[seg_reg].limit, 1842 env->segs[seg_reg].flags & ~DESC_P_MASK); 1843 } 1844 } 1845 } 1846 1847 /* protected mode iret */ 1848 static inline void helper_ret_protected(CPUX86State *env, int shift, 1849 int is_iret, int addend, 1850 uintptr_t retaddr) 1851 { 1852 uint32_t new_cs, new_eflags, new_ss; 1853 uint32_t new_es, new_ds, new_fs, new_gs; 1854 uint32_t e1, e2, ss_e1, ss_e2; 1855 int cpl, dpl, rpl, eflags_mask, iopl; 1856 target_ulong ssp, sp, new_eip, new_esp, sp_mask; 1857 1858 #ifdef TARGET_X86_64 1859 if (shift == 2) { 1860 sp_mask = -1; 1861 } else 1862 #endif 1863 { 1864 sp_mask = get_sp_mask(env->segs[R_SS].flags); 1865 } 1866 sp = env->regs[R_ESP]; 1867 ssp = env->segs[R_SS].base; 1868 new_eflags = 0; /* avoid warning */ 1869 #ifdef TARGET_X86_64 1870 if (shift == 2) { 1871 POPQ_RA(sp, new_eip, retaddr); 1872 POPQ_RA(sp, new_cs, retaddr); 1873 new_cs &= 0xffff; 1874 if (is_iret) { 1875 POPQ_RA(sp, new_eflags, retaddr); 1876 } 1877 } else 1878 #endif 1879 { 1880 if (shift == 1) { 1881 /* 32 bits */ 1882 POPL_RA(ssp, sp, sp_mask, new_eip, retaddr); 1883 POPL_RA(ssp, sp, sp_mask, new_cs, retaddr); 1884 new_cs &= 0xffff; 1885 if (is_iret) { 1886 POPL_RA(ssp, sp, sp_mask, new_eflags, retaddr); 1887 if (new_eflags & VM_MASK) { 1888 goto return_to_vm86; 1889 } 1890 } 1891 } else { 1892 /* 16 bits */ 1893 POPW_RA(ssp, sp, sp_mask, new_eip, retaddr); 1894 POPW_RA(ssp, sp, sp_mask, new_cs, retaddr); 1895 if (is_iret) { 1896 POPW_RA(ssp, sp, sp_mask, new_eflags, retaddr); 1897 } 1898 } 1899 } 1900 LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n", 1901 new_cs, new_eip, shift, addend); 1902 LOG_PCALL_STATE(env_cpu(env)); 1903 if ((new_cs & 0xfffc) == 0) { 1904 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1905 } 1906 if (load_segment_ra(env, &e1, &e2, new_cs, retaddr) != 0) { 1907 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1908 } 1909 if (!(e2 & DESC_S_MASK) || 1910 !(e2 & DESC_CS_MASK)) { 1911 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1912 } 1913 cpl = env->hflags & HF_CPL_MASK; 1914 rpl = new_cs & 3; 1915 if (rpl < cpl) { 1916 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1917 } 1918 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 1919 if (e2 & DESC_C_MASK) { 1920 if (dpl > rpl) { 1921 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1922 } 1923 } else { 1924 if (dpl != rpl) { 1925 raise_exception_err_ra(env, EXCP0D_GPF, new_cs & 0xfffc, retaddr); 1926 } 1927 } 1928 if (!(e2 & DESC_P_MASK)) { 1929 raise_exception_err_ra(env, EXCP0B_NOSEG, new_cs & 0xfffc, retaddr); 1930 } 1931 1932 sp += addend; 1933 if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) || 1934 ((env->hflags & HF_CS64_MASK) && !is_iret))) { 1935 /* return to same privilege level */ 1936 cpu_x86_load_seg_cache(env, R_CS, new_cs, 1937 get_seg_base(e1, e2), 1938 get_seg_limit(e1, e2), 1939 e2); 1940 } else { 1941 /* return to different privilege level */ 1942 #ifdef TARGET_X86_64 1943 if (shift == 2) { 1944 POPQ_RA(sp, new_esp, retaddr); 1945 POPQ_RA(sp, new_ss, retaddr); 1946 new_ss &= 0xffff; 1947 } else 1948 #endif 1949 { 1950 if (shift == 1) { 1951 /* 32 bits */ 1952 POPL_RA(ssp, sp, sp_mask, new_esp, retaddr); 1953 POPL_RA(ssp, sp, sp_mask, new_ss, retaddr); 1954 new_ss &= 0xffff; 1955 } else { 1956 /* 16 bits */ 1957 POPW_RA(ssp, sp, sp_mask, new_esp, retaddr); 1958 POPW_RA(ssp, sp, sp_mask, new_ss, retaddr); 1959 } 1960 } 1961 LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n", 1962 new_ss, new_esp); 1963 if ((new_ss & 0xfffc) == 0) { 1964 #ifdef TARGET_X86_64 1965 /* NULL ss is allowed in long mode if cpl != 3 */ 1966 /* XXX: test CS64? */ 1967 if ((env->hflags & HF_LMA_MASK) && rpl != 3) { 1968 cpu_x86_load_seg_cache(env, R_SS, new_ss, 1969 0, 0xffffffff, 1970 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 1971 DESC_S_MASK | (rpl << DESC_DPL_SHIFT) | 1972 DESC_W_MASK | DESC_A_MASK); 1973 ss_e2 = DESC_B_MASK; /* XXX: should not be needed? */ 1974 } else 1975 #endif 1976 { 1977 raise_exception_err_ra(env, EXCP0D_GPF, 0, retaddr); 1978 } 1979 } else { 1980 if ((new_ss & 3) != rpl) { 1981 raise_exception_err_ra(env, EXCP0D_GPF, new_ss & 0xfffc, retaddr); 1982 } 1983 if (load_segment_ra(env, &ss_e1, &ss_e2, new_ss, retaddr) != 0) { 1984 raise_exception_err_ra(env, EXCP0D_GPF, new_ss & 0xfffc, retaddr); 1985 } 1986 if (!(ss_e2 & DESC_S_MASK) || 1987 (ss_e2 & DESC_CS_MASK) || 1988 !(ss_e2 & DESC_W_MASK)) { 1989 raise_exception_err_ra(env, EXCP0D_GPF, new_ss & 0xfffc, retaddr); 1990 } 1991 dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3; 1992 if (dpl != rpl) { 1993 raise_exception_err_ra(env, EXCP0D_GPF, new_ss & 0xfffc, retaddr); 1994 } 1995 if (!(ss_e2 & DESC_P_MASK)) { 1996 raise_exception_err_ra(env, EXCP0B_NOSEG, new_ss & 0xfffc, retaddr); 1997 } 1998 cpu_x86_load_seg_cache(env, R_SS, new_ss, 1999 get_seg_base(ss_e1, ss_e2), 2000 get_seg_limit(ss_e1, ss_e2), 2001 ss_e2); 2002 } 2003 2004 cpu_x86_load_seg_cache(env, R_CS, new_cs, 2005 get_seg_base(e1, e2), 2006 get_seg_limit(e1, e2), 2007 e2); 2008 sp = new_esp; 2009 #ifdef TARGET_X86_64 2010 if (env->hflags & HF_CS64_MASK) { 2011 sp_mask = -1; 2012 } else 2013 #endif 2014 { 2015 sp_mask = get_sp_mask(ss_e2); 2016 } 2017 2018 /* validate data segments */ 2019 validate_seg(env, R_ES, rpl); 2020 validate_seg(env, R_DS, rpl); 2021 validate_seg(env, R_FS, rpl); 2022 validate_seg(env, R_GS, rpl); 2023 2024 sp += addend; 2025 } 2026 SET_ESP(sp, sp_mask); 2027 env->eip = new_eip; 2028 if (is_iret) { 2029 /* NOTE: 'cpl' is the _old_ CPL */ 2030 eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK; 2031 if (cpl == 0) { 2032 eflags_mask |= IOPL_MASK; 2033 } 2034 iopl = (env->eflags >> IOPL_SHIFT) & 3; 2035 if (cpl <= iopl) { 2036 eflags_mask |= IF_MASK; 2037 } 2038 if (shift == 0) { 2039 eflags_mask &= 0xffff; 2040 } 2041 cpu_load_eflags(env, new_eflags, eflags_mask); 2042 } 2043 return; 2044 2045 return_to_vm86: 2046 POPL_RA(ssp, sp, sp_mask, new_esp, retaddr); 2047 POPL_RA(ssp, sp, sp_mask, new_ss, retaddr); 2048 POPL_RA(ssp, sp, sp_mask, new_es, retaddr); 2049 POPL_RA(ssp, sp, sp_mask, new_ds, retaddr); 2050 POPL_RA(ssp, sp, sp_mask, new_fs, retaddr); 2051 POPL_RA(ssp, sp, sp_mask, new_gs, retaddr); 2052 2053 /* modify processor state */ 2054 cpu_load_eflags(env, new_eflags, TF_MASK | AC_MASK | ID_MASK | 2055 IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK | 2056 VIP_MASK); 2057 load_seg_vm(env, R_CS, new_cs & 0xffff); 2058 load_seg_vm(env, R_SS, new_ss & 0xffff); 2059 load_seg_vm(env, R_ES, new_es & 0xffff); 2060 load_seg_vm(env, R_DS, new_ds & 0xffff); 2061 load_seg_vm(env, R_FS, new_fs & 0xffff); 2062 load_seg_vm(env, R_GS, new_gs & 0xffff); 2063 2064 env->eip = new_eip & 0xffff; 2065 env->regs[R_ESP] = new_esp; 2066 } 2067 2068 void helper_iret_protected(CPUX86State *env, int shift, int next_eip) 2069 { 2070 int tss_selector, type; 2071 uint32_t e1, e2; 2072 2073 /* specific case for TSS */ 2074 if (env->eflags & NT_MASK) { 2075 #ifdef TARGET_X86_64 2076 if (env->hflags & HF_LMA_MASK) { 2077 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 2078 } 2079 #endif 2080 tss_selector = cpu_lduw_kernel_ra(env, env->tr.base + 0, GETPC()); 2081 if (tss_selector & 4) { 2082 raise_exception_err_ra(env, EXCP0A_TSS, tss_selector & 0xfffc, GETPC()); 2083 } 2084 if (load_segment_ra(env, &e1, &e2, tss_selector, GETPC()) != 0) { 2085 raise_exception_err_ra(env, EXCP0A_TSS, tss_selector & 0xfffc, GETPC()); 2086 } 2087 type = (e2 >> DESC_TYPE_SHIFT) & 0x17; 2088 /* NOTE: we check both segment and busy TSS */ 2089 if (type != 3) { 2090 raise_exception_err_ra(env, EXCP0A_TSS, tss_selector & 0xfffc, GETPC()); 2091 } 2092 switch_tss_ra(env, tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip, GETPC()); 2093 } else { 2094 helper_ret_protected(env, shift, 1, 0, GETPC()); 2095 } 2096 env->hflags2 &= ~HF2_NMI_MASK; 2097 } 2098 2099 void helper_lret_protected(CPUX86State *env, int shift, int addend) 2100 { 2101 helper_ret_protected(env, shift, 0, addend, GETPC()); 2102 } 2103 2104 void helper_sysenter(CPUX86State *env) 2105 { 2106 if (env->sysenter_cs == 0) { 2107 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 2108 } 2109 env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK); 2110 2111 #ifdef TARGET_X86_64 2112 if (env->hflags & HF_LMA_MASK) { 2113 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc, 2114 0, 0xffffffff, 2115 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2116 DESC_S_MASK | 2117 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | 2118 DESC_L_MASK); 2119 } else 2120 #endif 2121 { 2122 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc, 2123 0, 0xffffffff, 2124 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2125 DESC_S_MASK | 2126 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); 2127 } 2128 cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc, 2129 0, 0xffffffff, 2130 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2131 DESC_S_MASK | 2132 DESC_W_MASK | DESC_A_MASK); 2133 env->regs[R_ESP] = env->sysenter_esp; 2134 env->eip = env->sysenter_eip; 2135 } 2136 2137 void helper_sysexit(CPUX86State *env, int dflag) 2138 { 2139 int cpl; 2140 2141 cpl = env->hflags & HF_CPL_MASK; 2142 if (env->sysenter_cs == 0 || cpl != 0) { 2143 raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC()); 2144 } 2145 #ifdef TARGET_X86_64 2146 if (dflag == 2) { 2147 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) | 2148 3, 0, 0xffffffff, 2149 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2150 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 2151 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK | 2152 DESC_L_MASK); 2153 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) | 2154 3, 0, 0xffffffff, 2155 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2156 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 2157 DESC_W_MASK | DESC_A_MASK); 2158 } else 2159 #endif 2160 { 2161 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) | 2162 3, 0, 0xffffffff, 2163 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2164 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 2165 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); 2166 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) | 2167 3, 0, 0xffffffff, 2168 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK | 2169 DESC_S_MASK | (3 << DESC_DPL_SHIFT) | 2170 DESC_W_MASK | DESC_A_MASK); 2171 } 2172 env->regs[R_ESP] = env->regs[R_ECX]; 2173 env->eip = env->regs[R_EDX]; 2174 } 2175 2176 target_ulong helper_lsl(CPUX86State *env, target_ulong selector1) 2177 { 2178 unsigned int limit; 2179 uint32_t e1, e2, eflags, selector; 2180 int rpl, dpl, cpl, type; 2181 2182 selector = selector1 & 0xffff; 2183 eflags = cpu_cc_compute_all(env, CC_OP); 2184 if ((selector & 0xfffc) == 0) { 2185 goto fail; 2186 } 2187 if (load_segment_ra(env, &e1, &e2, selector, GETPC()) != 0) { 2188 goto fail; 2189 } 2190 rpl = selector & 3; 2191 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 2192 cpl = env->hflags & HF_CPL_MASK; 2193 if (e2 & DESC_S_MASK) { 2194 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) { 2195 /* conforming */ 2196 } else { 2197 if (dpl < cpl || dpl < rpl) { 2198 goto fail; 2199 } 2200 } 2201 } else { 2202 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 2203 switch (type) { 2204 case 1: 2205 case 2: 2206 case 3: 2207 case 9: 2208 case 11: 2209 break; 2210 default: 2211 goto fail; 2212 } 2213 if (dpl < cpl || dpl < rpl) { 2214 fail: 2215 CC_SRC = eflags & ~CC_Z; 2216 return 0; 2217 } 2218 } 2219 limit = get_seg_limit(e1, e2); 2220 CC_SRC = eflags | CC_Z; 2221 return limit; 2222 } 2223 2224 target_ulong helper_lar(CPUX86State *env, target_ulong selector1) 2225 { 2226 uint32_t e1, e2, eflags, selector; 2227 int rpl, dpl, cpl, type; 2228 2229 selector = selector1 & 0xffff; 2230 eflags = cpu_cc_compute_all(env, CC_OP); 2231 if ((selector & 0xfffc) == 0) { 2232 goto fail; 2233 } 2234 if (load_segment_ra(env, &e1, &e2, selector, GETPC()) != 0) { 2235 goto fail; 2236 } 2237 rpl = selector & 3; 2238 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 2239 cpl = env->hflags & HF_CPL_MASK; 2240 if (e2 & DESC_S_MASK) { 2241 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) { 2242 /* conforming */ 2243 } else { 2244 if (dpl < cpl || dpl < rpl) { 2245 goto fail; 2246 } 2247 } 2248 } else { 2249 type = (e2 >> DESC_TYPE_SHIFT) & 0xf; 2250 switch (type) { 2251 case 1: 2252 case 2: 2253 case 3: 2254 case 4: 2255 case 5: 2256 case 9: 2257 case 11: 2258 case 12: 2259 break; 2260 default: 2261 goto fail; 2262 } 2263 if (dpl < cpl || dpl < rpl) { 2264 fail: 2265 CC_SRC = eflags & ~CC_Z; 2266 return 0; 2267 } 2268 } 2269 CC_SRC = eflags | CC_Z; 2270 return e2 & 0x00f0ff00; 2271 } 2272 2273 void helper_verr(CPUX86State *env, target_ulong selector1) 2274 { 2275 uint32_t e1, e2, eflags, selector; 2276 int rpl, dpl, cpl; 2277 2278 selector = selector1 & 0xffff; 2279 eflags = cpu_cc_compute_all(env, CC_OP); 2280 if ((selector & 0xfffc) == 0) { 2281 goto fail; 2282 } 2283 if (load_segment_ra(env, &e1, &e2, selector, GETPC()) != 0) { 2284 goto fail; 2285 } 2286 if (!(e2 & DESC_S_MASK)) { 2287 goto fail; 2288 } 2289 rpl = selector & 3; 2290 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 2291 cpl = env->hflags & HF_CPL_MASK; 2292 if (e2 & DESC_CS_MASK) { 2293 if (!(e2 & DESC_R_MASK)) { 2294 goto fail; 2295 } 2296 if (!(e2 & DESC_C_MASK)) { 2297 if (dpl < cpl || dpl < rpl) { 2298 goto fail; 2299 } 2300 } 2301 } else { 2302 if (dpl < cpl || dpl < rpl) { 2303 fail: 2304 CC_SRC = eflags & ~CC_Z; 2305 return; 2306 } 2307 } 2308 CC_SRC = eflags | CC_Z; 2309 } 2310 2311 void helper_verw(CPUX86State *env, target_ulong selector1) 2312 { 2313 uint32_t e1, e2, eflags, selector; 2314 int rpl, dpl, cpl; 2315 2316 selector = selector1 & 0xffff; 2317 eflags = cpu_cc_compute_all(env, CC_OP); 2318 if ((selector & 0xfffc) == 0) { 2319 goto fail; 2320 } 2321 if (load_segment_ra(env, &e1, &e2, selector, GETPC()) != 0) { 2322 goto fail; 2323 } 2324 if (!(e2 & DESC_S_MASK)) { 2325 goto fail; 2326 } 2327 rpl = selector & 3; 2328 dpl = (e2 >> DESC_DPL_SHIFT) & 3; 2329 cpl = env->hflags & HF_CPL_MASK; 2330 if (e2 & DESC_CS_MASK) { 2331 goto fail; 2332 } else { 2333 if (dpl < cpl || dpl < rpl) { 2334 goto fail; 2335 } 2336 if (!(e2 & DESC_W_MASK)) { 2337 fail: 2338 CC_SRC = eflags & ~CC_Z; 2339 return; 2340 } 2341 } 2342 CC_SRC = eflags | CC_Z; 2343 } 2344