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eaa728ee 1/*
10774999
BS		 2 * x86 segmentation related helpers:
3 * TSS, interrupts, system calls, jumps and call/task gates, descriptors
eaa728ee
FB		 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 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
8167ee88 18 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
eaa728ee 19 */
83dae095 20
3e457172 21#include "cpu.h"
3e457172 22#include "qemu-log.h"
3e457172 23#include "helper.h"
eaa728ee 24
3e457172 25//#define DEBUG_PCALL
d12d51d5 26
92fc4b58 27#if !defined(CONFIG_USER_ONLY)
022c62cb 28#include "exec/softmmu_exec.h"
92fc4b58
BS		 29#endif /* !defined(CONFIG_USER_ONLY) */
30
d12d51d5 31#ifdef DEBUG_PCALL
20054ef0
BS		 32# define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__)
33# define LOG_PCALL_STATE(env) \
6fd2a026 34 log_cpu_state_mask(CPU_LOG_PCALL, (env), CPU_DUMP_CCOP)
d12d51d5 35#else
20054ef0
BS		 36# define LOG_PCALL(...) do { } while (0)
37# define LOG_PCALL_STATE(env) do { } while (0)
d12d51d5
AL		 38#endif
39
eaa728ee 40/* return non zero if error */
2999a0b2
BS		 41static inline int load_segment(CPUX86State *env, uint32_t *e1_ptr,
42 uint32_t *e2_ptr, int selector)
eaa728ee
FB		 43{
44 SegmentCache *dt;
45 int index;
46 target_ulong ptr;
47
20054ef0 48 if (selector & 0x4) {
eaa728ee 49 dt = &env->ldt;
20054ef0 50 } else {
eaa728ee 51 dt = &env->gdt;
20054ef0 52 }
eaa728ee 53 index = selector & ~7;
20054ef0 54 if ((index + 7) > dt->limit) {
eaa728ee 55 return -1;
20054ef0 56 }
eaa728ee 57 ptr = dt->base + index;
329e607d
BS		 58 *e1_ptr = cpu_ldl_kernel(env, ptr);
59 *e2_ptr = cpu_ldl_kernel(env, ptr + 4);
eaa728ee
FB		 60 return 0;
61}
62
63static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
64{
65 unsigned int limit;
20054ef0 66
eaa728ee 67 limit = (e1 & 0xffff) | (e2 & 0x000f0000);
20054ef0 68 if (e2 & DESC_G_MASK) {
eaa728ee 69 limit = (limit << 12) | 0xfff;
20054ef0 70 }
eaa728ee
FB		 71 return limit;
72}
73
74static inline uint32_t get_seg_base(uint32_t e1, uint32_t e2)
75{
20054ef0 76 return (e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000);
eaa728ee
FB		 77}
78
20054ef0
BS		 79static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1,
80 uint32_t e2)
eaa728ee
FB		 81{
82 sc->base = get_seg_base(e1, e2);
83 sc->limit = get_seg_limit(e1, e2);
84 sc->flags = e2;
85}
86
87/* init the segment cache in vm86 mode. */
2999a0b2 88static inline void load_seg_vm(CPUX86State *env, int seg, int selector)
eaa728ee
FB		 89{
90 selector &= 0xffff;
91 cpu_x86_load_seg_cache(env, seg, selector,
92 (selector << 4), 0xffff, 0);
93}
94
2999a0b2 95static inline void get_ss_esp_from_tss(CPUX86State *env, uint32_t *ss_ptr,
eaa728ee
FB		 96 uint32_t *esp_ptr, int dpl)
97{
98 int type, index, shift;
99
100#if 0
101 {
102 int i;
103 printf("TR: base=%p limit=%x\n", env->tr.base, env->tr.limit);
20054ef0 104 for (i = 0; i < env->tr.limit; i++) {
eaa728ee 105 printf("%02x ", env->tr.base[i]);
20054ef0
BS		 106 if ((i & 7) == 7) {
107 printf("\n");
108 }
eaa728ee
FB		 109 }
110 printf("\n");
111 }
112#endif
113
20054ef0 114 if (!(env->tr.flags & DESC_P_MASK)) {
eaa728ee 115 cpu_abort(env, "invalid tss");
20054ef0 116 }
eaa728ee 117 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 118 if ((type & 7) != 1) {
eaa728ee 119 cpu_abort(env, "invalid tss type");
20054ef0 120 }
eaa728ee
FB		 121 shift = type >> 3;
122 index = (dpl * 4 + 2) << shift;
20054ef0 123 if (index + (4 << shift) - 1 > env->tr.limit) {
77b2bc2c 124 raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
20054ef0 125 }
eaa728ee 126 if (shift == 0) {
329e607d
BS		 127 *esp_ptr = cpu_lduw_kernel(env, env->tr.base + index);
128 *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 2);
eaa728ee 129 } else {
329e607d
BS		 130 *esp_ptr = cpu_ldl_kernel(env, env->tr.base + index);
131 *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 4);
eaa728ee
FB		 132 }
133}
134
135/* XXX: merge with load_seg() */
2999a0b2 136static void tss_load_seg(CPUX86State *env, int seg_reg, int selector)
eaa728ee
FB		 137{
138 uint32_t e1, e2;
139 int rpl, dpl, cpl;
140
141 if ((selector & 0xfffc) != 0) {
2999a0b2 142 if (load_segment(env, &e1, &e2, selector) != 0) {
77b2bc2c 143 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0
BS		 144 }
145 if (!(e2 & DESC_S_MASK)) {
77b2bc2c 146 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 147 }
eaa728ee
FB		 148 rpl = selector & 3;
149 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
150 cpl = env->hflags & HF_CPL_MASK;
151 if (seg_reg == R_CS) {
20054ef0 152 if (!(e2 & DESC_CS_MASK)) {
77b2bc2c 153 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0
BS		 154 }
155 /* XXX: is it correct? */
156 if (dpl != rpl) {
77b2bc2c 157 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0
BS		 158 }
159 if ((e2 & DESC_C_MASK) && dpl > rpl) {
77b2bc2c 160 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 161 }
eaa728ee
FB		 162 } else if (seg_reg == R_SS) {
163 /* SS must be writable data */
20054ef0 164 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
77b2bc2c 165 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0
BS		 166 }
167 if (dpl != cpl || dpl != rpl) {
77b2bc2c 168 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 169 }
eaa728ee
FB		 170 } else {
171 /* not readable code */
20054ef0 172 if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) {
77b2bc2c 173 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 174 }
eaa728ee
FB		 175 /* if data or non conforming code, checks the rights */
176 if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
20054ef0 177 if (dpl < cpl || dpl < rpl) {
77b2bc2c 178 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 179 }
eaa728ee
FB		 180 }
181 }
20054ef0 182 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 183 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 184 }
eaa728ee 185 cpu_x86_load_seg_cache(env, seg_reg, selector,
20054ef0
BS		 186 get_seg_base(e1, e2),
187 get_seg_limit(e1, e2),
188 e2);
eaa728ee 189 } else {
20054ef0 190 if (seg_reg == R_SS || seg_reg == R_CS) {
77b2bc2c 191 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
20054ef0 192 }
eaa728ee
FB		 193 }
194}
195
196#define SWITCH_TSS_JMP 0
197#define SWITCH_TSS_IRET 1
198#define SWITCH_TSS_CALL 2
199
200/* XXX: restore CPU state in registers (PowerPC case) */
2999a0b2 201static void switch_tss(CPUX86State *env, int tss_selector,
eaa728ee
FB		 202 uint32_t e1, uint32_t e2, int source,
203 uint32_t next_eip)
204{
205 int tss_limit, tss_limit_max, type, old_tss_limit_max, old_type, v1, v2, i;
206 target_ulong tss_base;
207 uint32_t new_regs[8], new_segs[6];
208 uint32_t new_eflags, new_eip, new_cr3, new_ldt, new_trap;
209 uint32_t old_eflags, eflags_mask;
210 SegmentCache *dt;
211 int index;
212 target_ulong ptr;
213
214 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
20054ef0
BS		 215 LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type,
216 source);
eaa728ee
FB		 217
218 /* if task gate, we read the TSS segment and we load it */
219 if (type == 5) {
20054ef0 220 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 221 raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
20054ef0 222 }
eaa728ee 223 tss_selector = e1 >> 16;
20054ef0 224 if (tss_selector & 4) {
77b2bc2c 225 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
20054ef0 226 }
2999a0b2 227 if (load_segment(env, &e1, &e2, tss_selector) != 0) {
77b2bc2c 228 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
20054ef0
BS		 229 }
230 if (e2 & DESC_S_MASK) {
77b2bc2c 231 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
20054ef0 232 }
eaa728ee 233 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 234 if ((type & 7) != 1) {
77b2bc2c 235 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
20054ef0 236 }
eaa728ee
FB		 237 }
238
20054ef0 239 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 240 raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
20054ef0 241 }
eaa728ee 242
20054ef0 243 if (type & 8) {
eaa728ee 244 tss_limit_max = 103;
20054ef0 245 } else {
eaa728ee 246 tss_limit_max = 43;
20054ef0 247 }
eaa728ee
FB		 248 tss_limit = get_seg_limit(e1, e2);
249 tss_base = get_seg_base(e1, e2);
250 if ((tss_selector & 4) != 0 ||
20054ef0 251 tss_limit < tss_limit_max) {
77b2bc2c 252 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
20054ef0 253 }
eaa728ee 254 old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 255 if (old_type & 8) {
eaa728ee 256 old_tss_limit_max = 103;
20054ef0 257 } else {
eaa728ee 258 old_tss_limit_max = 43;
20054ef0 259 }
eaa728ee
FB		 260
261 /* read all the registers from the new TSS */
262 if (type & 8) {
263 /* 32 bit */
329e607d
BS		 264 new_cr3 = cpu_ldl_kernel(env, tss_base + 0x1c);
265 new_eip = cpu_ldl_kernel(env, tss_base + 0x20);
266 new_eflags = cpu_ldl_kernel(env, tss_base + 0x24);
20054ef0 267 for (i = 0; i < 8; i++) {
329e607d 268 new_regs[i] = cpu_ldl_kernel(env, tss_base + (0x28 + i * 4));
20054ef0
BS		 269 }
270 for (i = 0; i < 6; i++) {
329e607d 271 new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x48 + i * 4));
20054ef0 272 }
329e607d
BS		 273 new_ldt = cpu_lduw_kernel(env, tss_base + 0x60);
274 new_trap = cpu_ldl_kernel(env, tss_base + 0x64);
eaa728ee
FB		 275 } else {
276 /* 16 bit */
277 new_cr3 = 0;
329e607d
BS		 278 new_eip = cpu_lduw_kernel(env, tss_base + 0x0e);
279 new_eflags = cpu_lduw_kernel(env, tss_base + 0x10);
20054ef0 280 for (i = 0; i < 8; i++) {
329e607d
BS		 281 new_regs[i] = cpu_lduw_kernel(env, tss_base + (0x12 + i * 2)) |
282 0xffff0000;
20054ef0
BS		 283 }
284 for (i = 0; i < 4; i++) {
329e607d 285 new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x22 + i * 4));
20054ef0 286 }
329e607d 287 new_ldt = cpu_lduw_kernel(env, tss_base + 0x2a);
eaa728ee
FB		 288 new_segs[R_FS] = 0;
289 new_segs[R_GS] = 0;
290 new_trap = 0;
291 }
4581cbcd
BS		 292 /* XXX: avoid a compiler warning, see
293 http://support.amd.com/us/Processor_TechDocs/24593.pdf
294 chapters 12.2.5 and 13.2.4 on how to implement TSS Trap bit */
295 (void)new_trap;
eaa728ee
FB		 296
297 /* NOTE: we must avoid memory exceptions during the task switch,
298 so we make dummy accesses before */
299 /* XXX: it can still fail in some cases, so a bigger hack is
300 necessary to valid the TLB after having done the accesses */
301
329e607d
BS		 302 v1 = cpu_ldub_kernel(env, env->tr.base);
303 v2 = cpu_ldub_kernel(env, env->tr.base + old_tss_limit_max);
304 cpu_stb_kernel(env, env->tr.base, v1);
305 cpu_stb_kernel(env, env->tr.base + old_tss_limit_max, v2);
eaa728ee
FB		 306
307 /* clear busy bit (it is restartable) */
308 if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_IRET) {
309 target_ulong ptr;
310 uint32_t e2;
20054ef0 311
eaa728ee 312 ptr = env->gdt.base + (env->tr.selector & ~7);
329e607d 313 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee 314 e2 &= ~DESC_TSS_BUSY_MASK;
329e607d 315 cpu_stl_kernel(env, ptr + 4, e2);
eaa728ee 316 }
997ff0d9 317 old_eflags = cpu_compute_eflags(env);
20054ef0 318 if (source == SWITCH_TSS_IRET) {
eaa728ee 319 old_eflags &= ~NT_MASK;
20054ef0 320 }
eaa728ee
FB		 321
322 /* save the current state in the old TSS */
323 if (type & 8) {
324 /* 32 bit */
329e607d
BS		 325 cpu_stl_kernel(env, env->tr.base + 0x20, next_eip);
326 cpu_stl_kernel(env, env->tr.base + 0x24, old_eflags);
327 cpu_stl_kernel(env, env->tr.base + (0x28 + 0 * 4), EAX);
328 cpu_stl_kernel(env, env->tr.base + (0x28 + 1 * 4), ECX);
329 cpu_stl_kernel(env, env->tr.base + (0x28 + 2 * 4), EDX);
330 cpu_stl_kernel(env, env->tr.base + (0x28 + 3 * 4), EBX);
331 cpu_stl_kernel(env, env->tr.base + (0x28 + 4 * 4), ESP);
332 cpu_stl_kernel(env, env->tr.base + (0x28 + 5 * 4), EBP);
333 cpu_stl_kernel(env, env->tr.base + (0x28 + 6 * 4), ESI);
334 cpu_stl_kernel(env, env->tr.base + (0x28 + 7 * 4), EDI);
20054ef0 335 for (i = 0; i < 6; i++) {
329e607d
BS		 336 cpu_stw_kernel(env, env->tr.base + (0x48 + i * 4),
337 env->segs[i].selector);
20054ef0 338 }
eaa728ee
FB		 339 } else {
340 /* 16 bit */
329e607d
BS		 341 cpu_stw_kernel(env, env->tr.base + 0x0e, next_eip);
342 cpu_stw_kernel(env, env->tr.base + 0x10, old_eflags);
343 cpu_stw_kernel(env, env->tr.base + (0x12 + 0 * 2), EAX);
344 cpu_stw_kernel(env, env->tr.base + (0x12 + 1 * 2), ECX);
345 cpu_stw_kernel(env, env->tr.base + (0x12 + 2 * 2), EDX);
346 cpu_stw_kernel(env, env->tr.base + (0x12 + 3 * 2), EBX);
347 cpu_stw_kernel(env, env->tr.base + (0x12 + 4 * 2), ESP);
348 cpu_stw_kernel(env, env->tr.base + (0x12 + 5 * 2), EBP);
349 cpu_stw_kernel(env, env->tr.base + (0x12 + 6 * 2), ESI);
350 cpu_stw_kernel(env, env->tr.base + (0x12 + 7 * 2), EDI);
20054ef0 351 for (i = 0; i < 4; i++) {
329e607d
BS		 352 cpu_stw_kernel(env, env->tr.base + (0x22 + i * 4),
353 env->segs[i].selector);
20054ef0 354 }
eaa728ee
FB		 355 }
356
357 /* now if an exception occurs, it will occurs in the next task
358 context */
359
360 if (source == SWITCH_TSS_CALL) {
329e607d 361 cpu_stw_kernel(env, tss_base, env->tr.selector);
eaa728ee
FB		 362 new_eflags |= NT_MASK;
363 }
364
365 /* set busy bit */
366 if (source == SWITCH_TSS_JMP || source == SWITCH_TSS_CALL) {
367 target_ulong ptr;
368 uint32_t e2;
20054ef0 369
eaa728ee 370 ptr = env->gdt.base + (tss_selector & ~7);
329e607d 371 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee 372 e2 |= DESC_TSS_BUSY_MASK;
329e607d 373 cpu_stl_kernel(env, ptr + 4, e2);
eaa728ee
FB		 374 }
375
376 /* set the new CPU state */
377 /* from this point, any exception which occurs can give problems */
378 env->cr[0] |= CR0_TS_MASK;
379 env->hflags |= HF_TS_MASK;
380 env->tr.selector = tss_selector;
381 env->tr.base = tss_base;
382 env->tr.limit = tss_limit;
383 env->tr.flags = e2 & ~DESC_TSS_BUSY_MASK;
384
385 if ((type & 8) && (env->cr[0] & CR0_PG_MASK)) {
386 cpu_x86_update_cr3(env, new_cr3);
387 }
388
389 /* load all registers without an exception, then reload them with
390 possible exception */
391 env->eip = new_eip;
392 eflags_mask = TF_MASK | AC_MASK | ID_MASK |
393 IF_MASK | IOPL_MASK | VM_MASK | RF_MASK | NT_MASK;
20054ef0 394 if (!(type & 8)) {
eaa728ee 395 eflags_mask &= 0xffff;
20054ef0 396 }
997ff0d9 397 cpu_load_eflags(env, new_eflags, eflags_mask);
20054ef0 398 /* XXX: what to do in 16 bit case? */
eaa728ee
FB		 399 EAX = new_regs[0];
400 ECX = new_regs[1];
401 EDX = new_regs[2];
402 EBX = new_regs[3];
403 ESP = new_regs[4];
404 EBP = new_regs[5];
405 ESI = new_regs[6];
406 EDI = new_regs[7];
407 if (new_eflags & VM_MASK) {
20054ef0 408 for (i = 0; i < 6; i++) {
2999a0b2 409 load_seg_vm(env, i, new_segs[i]);
20054ef0 410 }
eaa728ee
FB		 411 /* in vm86, CPL is always 3 */
412 cpu_x86_set_cpl(env, 3);
413 } else {
414 /* CPL is set the RPL of CS */
415 cpu_x86_set_cpl(env, new_segs[R_CS] & 3);
416 /* first just selectors as the rest may trigger exceptions */
20054ef0 417 for (i = 0; i < 6; i++) {
eaa728ee 418 cpu_x86_load_seg_cache(env, i, new_segs[i], 0, 0, 0);
20054ef0 419 }
eaa728ee
FB		 420 }
421
422 env->ldt.selector = new_ldt & ~4;
423 env->ldt.base = 0;
424 env->ldt.limit = 0;
425 env->ldt.flags = 0;
426
427 /* load the LDT */
20054ef0 428 if (new_ldt & 4) {
77b2bc2c 429 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
20054ef0 430 }
eaa728ee
FB		 431
432 if ((new_ldt & 0xfffc) != 0) {
433 dt = &env->gdt;
434 index = new_ldt & ~7;
20054ef0 435 if ((index + 7) > dt->limit) {
77b2bc2c 436 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
20054ef0 437 }
eaa728ee 438 ptr = dt->base + index;
329e607d
BS		 439 e1 = cpu_ldl_kernel(env, ptr);
440 e2 = cpu_ldl_kernel(env, ptr + 4);
20054ef0 441 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
77b2bc2c 442 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
20054ef0
BS		 443 }
444 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 445 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
20054ef0 446 }
eaa728ee
FB		 447 load_seg_cache_raw_dt(&env->ldt, e1, e2);
448 }
449
450 /* load the segments */
451 if (!(new_eflags & VM_MASK)) {
2999a0b2
BS		 452 tss_load_seg(env, R_CS, new_segs[R_CS]);
453 tss_load_seg(env, R_SS, new_segs[R_SS]);
454 tss_load_seg(env, R_ES, new_segs[R_ES]);
455 tss_load_seg(env, R_DS, new_segs[R_DS]);
456 tss_load_seg(env, R_FS, new_segs[R_FS]);
457 tss_load_seg(env, R_GS, new_segs[R_GS]);
eaa728ee
FB		 458 }
459
460 /* check that EIP is in the CS segment limits */
461 if (new_eip > env->segs[R_CS].limit) {
20054ef0 462 /* XXX: different exception if CALL? */
77b2bc2c 463 raise_exception_err(env, EXCP0D_GPF, 0);
eaa728ee 464 }
01df040b
AL		 465
466#ifndef CONFIG_USER_ONLY
467 /* reset local breakpoints */
468 if (env->dr[7] & 0x55) {
469 for (i = 0; i < 4; i++) {
20054ef0 470 if (hw_breakpoint_enabled(env->dr[7], i) == 0x1) {
01df040b 471 hw_breakpoint_remove(env, i);
20054ef0 472 }
01df040b
AL		 473 }
474 env->dr[7] &= ~0x55;
475 }
476#endif
eaa728ee
FB		 477}
478
eaa728ee
FB		 479static inline unsigned int get_sp_mask(unsigned int e2)
480{
20054ef0 481 if (e2 & DESC_B_MASK) {
eaa728ee 482 return 0xffffffff;
20054ef0 483 } else {
eaa728ee 484 return 0xffff;
20054ef0 485 }
eaa728ee
FB		 486}
487
20054ef0 488static int exception_has_error_code(int intno)
2ed51f5b 489{
20054ef0
BS		 490 switch (intno) {
491 case 8:
492 case 10:
493 case 11:
494 case 12:
495 case 13:
496 case 14:
497 case 17:
498 return 1;
499 }
500 return 0;
2ed51f5b
AL		 501}
502
eaa728ee 503#ifdef TARGET_X86_64
20054ef0
BS		 504#define SET_ESP(val, sp_mask) \
505 do { \
506 if ((sp_mask) == 0xffff) { \
507 ESP = (ESP & ~0xffff) | ((val) & 0xffff); \
508 } else if ((sp_mask) == 0xffffffffLL) { \
509 ESP = (uint32_t)(val); \
510 } else { \
511 ESP = (val); \
512 } \
513 } while (0)
eaa728ee 514#else
20054ef0
BS		 515#define SET_ESP(val, sp_mask) \
516 do { \
517 ESP = (ESP & ~(sp_mask)) | ((val) & (sp_mask)); \
518 } while (0)
eaa728ee
FB		 519#endif
520
c0a04f0e
AL		 521/* in 64-bit machines, this can overflow. So this segment addition macro
522 * can be used to trim the value to 32-bit whenever needed */
523#define SEG_ADDL(ssp, sp, sp_mask) ((uint32_t)((ssp) + (sp & (sp_mask))))
524
eaa728ee 525/* XXX: add a is_user flag to have proper security support */
329e607d
BS		 526#define PUSHW(ssp, sp, sp_mask, val) \
527 { \
528 sp -= 2; \
529 cpu_stw_kernel(env, (ssp) + (sp & (sp_mask)), (val)); \
20054ef0 530 }
eaa728ee 531
20054ef0
BS		 532#define PUSHL(ssp, sp, sp_mask, val) \
533 { \
534 sp -= 4; \
329e607d 535 cpu_stl_kernel(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val)); \
20054ef0 536 }
eaa728ee 537
329e607d
BS		 538#define POPW(ssp, sp, sp_mask, val) \
539 { \
540 val = cpu_lduw_kernel(env, (ssp) + (sp & (sp_mask))); \
541 sp += 2; \
20054ef0 542 }
eaa728ee 543
329e607d
BS		 544#define POPL(ssp, sp, sp_mask, val) \
545 { \
546 val = (uint32_t)cpu_ldl_kernel(env, SEG_ADDL(ssp, sp, sp_mask)); \
547 sp += 4; \
20054ef0 548 }
eaa728ee
FB		 549
550/* protected mode interrupt */
2999a0b2
BS		 551static void do_interrupt_protected(CPUX86State *env, int intno, int is_int,
552 int error_code, unsigned int next_eip,
553 int is_hw)
eaa728ee
FB		 554{
555 SegmentCache *dt;
556 target_ulong ptr, ssp;
557 int type, dpl, selector, ss_dpl, cpl;
558 int has_error_code, new_stack, shift;
1c918eba 559 uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0;
eaa728ee 560 uint32_t old_eip, sp_mask;
eaa728ee 561
eaa728ee 562 has_error_code = 0;
20054ef0
BS		 563 if (!is_int && !is_hw) {
564 has_error_code = exception_has_error_code(intno);
565 }
566 if (is_int) {
eaa728ee 567 old_eip = next_eip;
20054ef0 568 } else {
eaa728ee 569 old_eip = env->eip;
20054ef0 570 }
eaa728ee
FB		 571
572 dt = &env->idt;
20054ef0 573 if (intno * 8 + 7 > dt->limit) {
77b2bc2c 574 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
20054ef0 575 }
eaa728ee 576 ptr = dt->base + intno * 8;
329e607d
BS		 577 e1 = cpu_ldl_kernel(env, ptr);
578 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee
FB		 579 /* check gate type */
580 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
20054ef0 581 switch (type) {
eaa728ee
FB		 582 case 5: /* task gate */
583 /* must do that check here to return the correct error code */
20054ef0 584 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 585 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
20054ef0 586 }
2999a0b2 587 switch_tss(env, intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip);
eaa728ee
FB		 588 if (has_error_code) {
589 int type;
590 uint32_t mask;
20054ef0 591
eaa728ee
FB		 592 /* push the error code */
593 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
594 shift = type >> 3;
20054ef0 595 if (env->segs[R_SS].flags & DESC_B_MASK) {
eaa728ee 596 mask = 0xffffffff;
20054ef0 597 } else {
eaa728ee 598 mask = 0xffff;
20054ef0 599 }
eaa728ee
FB		 600 esp = (ESP - (2 << shift)) & mask;
601 ssp = env->segs[R_SS].base + esp;
20054ef0 602 if (shift) {
329e607d 603 cpu_stl_kernel(env, ssp, error_code);
20054ef0 604 } else {
329e607d 605 cpu_stw_kernel(env, ssp, error_code);
20054ef0 606 }
eaa728ee
FB		 607 SET_ESP(esp, mask);
608 }
609 return;
610 case 6: /* 286 interrupt gate */
611 case 7: /* 286 trap gate */
612 case 14: /* 386 interrupt gate */
613 case 15: /* 386 trap gate */
614 break;
615 default:
77b2bc2c 616 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
eaa728ee
FB		 617 break;
618 }
619 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
620 cpl = env->hflags & HF_CPL_MASK;
1235fc06 621 /* check privilege if software int */
20054ef0 622 if (is_int && dpl < cpl) {
77b2bc2c 623 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
20054ef0 624 }
eaa728ee 625 /* check valid bit */
20054ef0 626 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 627 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
20054ef0 628 }
eaa728ee
FB		 629 selector = e1 >> 16;
630 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
20054ef0 631 if ((selector & 0xfffc) == 0) {
77b2bc2c 632 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 633 }
2999a0b2 634 if (load_segment(env, &e1, &e2, selector) != 0) {
77b2bc2c 635 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 636 }
637 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
77b2bc2c 638 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 639 }
eaa728ee 640 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 641 if (dpl > cpl) {
77b2bc2c 642 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 643 }
644 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 645 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 646 }
eaa728ee
FB		 647 if (!(e2 & DESC_C_MASK) && dpl < cpl) {
648 /* to inner privilege */
2999a0b2 649 get_ss_esp_from_tss(env, &ss, &esp, dpl);
20054ef0 650 if ((ss & 0xfffc) == 0) {
77b2bc2c 651 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0
BS		 652 }
653 if ((ss & 3) != dpl) {
77b2bc2c 654 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 655 }
2999a0b2 656 if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
77b2bc2c 657 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 658 }
eaa728ee 659 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 660 if (ss_dpl != dpl) {
77b2bc2c 661 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 662 }
eaa728ee
FB		 663 if (!(ss_e2 & DESC_S_MASK) ||
664 (ss_e2 & DESC_CS_MASK) ||
20054ef0 665 !(ss_e2 & DESC_W_MASK)) {
77b2bc2c 666 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0
BS		 667 }
668 if (!(ss_e2 & DESC_P_MASK)) {
77b2bc2c 669 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 670 }
eaa728ee
FB		 671 new_stack = 1;
672 sp_mask = get_sp_mask(ss_e2);
673 ssp = get_seg_base(ss_e1, ss_e2);
674 } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
675 /* to same privilege */
20054ef0 676 if (env->eflags & VM_MASK) {
77b2bc2c 677 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 678 }
eaa728ee
FB		 679 new_stack = 0;
680 sp_mask = get_sp_mask(env->segs[R_SS].flags);
681 ssp = env->segs[R_SS].base;
682 esp = ESP;
683 dpl = cpl;
684 } else {
77b2bc2c 685 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
eaa728ee
FB		 686 new_stack = 0; /* avoid warning */
687 sp_mask = 0; /* avoid warning */
688 ssp = 0; /* avoid warning */
689 esp = 0; /* avoid warning */
690 }
691
692 shift = type >> 3;
693
694#if 0
695 /* XXX: check that enough room is available */
696 push_size = 6 + (new_stack << 2) + (has_error_code << 1);
20054ef0 697 if (env->eflags & VM_MASK) {
eaa728ee 698 push_size += 8;
20054ef0 699 }
eaa728ee
FB		 700 push_size <<= shift;
701#endif
702 if (shift == 1) {
703 if (new_stack) {
704 if (env->eflags & VM_MASK) {
705 PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector);
706 PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector);
707 PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector);
708 PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector);
709 }
710 PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector);
711 PUSHL(ssp, esp, sp_mask, ESP);
712 }
997ff0d9 713 PUSHL(ssp, esp, sp_mask, cpu_compute_eflags(env));
eaa728ee
FB		 714 PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector);
715 PUSHL(ssp, esp, sp_mask, old_eip);
716 if (has_error_code) {
717 PUSHL(ssp, esp, sp_mask, error_code);
718 }
719 } else {
720 if (new_stack) {
721 if (env->eflags & VM_MASK) {
722 PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector);
723 PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector);
724 PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector);
725 PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector);
726 }
727 PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector);
728 PUSHW(ssp, esp, sp_mask, ESP);
729 }
997ff0d9 730 PUSHW(ssp, esp, sp_mask, cpu_compute_eflags(env));
eaa728ee
FB		 731 PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector);
732 PUSHW(ssp, esp, sp_mask, old_eip);
733 if (has_error_code) {
734 PUSHW(ssp, esp, sp_mask, error_code);
735 }
736 }
737
738 if (new_stack) {
739 if (env->eflags & VM_MASK) {
740 cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0, 0);
741 cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0);
742 cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0);
743 cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0, 0);
744 }
745 ss = (ss & ~3) | dpl;
746 cpu_x86_load_seg_cache(env, R_SS, ss,
747 ssp, get_seg_limit(ss_e1, ss_e2), ss_e2);
748 }
749 SET_ESP(esp, sp_mask);
750
751 selector = (selector & ~3) | dpl;
752 cpu_x86_load_seg_cache(env, R_CS, selector,
753 get_seg_base(e1, e2),
754 get_seg_limit(e1, e2),
755 e2);
756 cpu_x86_set_cpl(env, dpl);
757 env->eip = offset;
758
759 /* interrupt gate clear IF mask */
760 if ((type & 1) == 0) {
761 env->eflags &= ~IF_MASK;
762 }
763 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
764}
765
766#ifdef TARGET_X86_64
767
20054ef0
BS		 768#define PUSHQ(sp, val) \
769 { \
770 sp -= 8; \
329e607d 771 cpu_stq_kernel(env, sp, (val)); \
20054ef0 772 }
eaa728ee 773
20054ef0
BS		 774#define POPQ(sp, val) \
775 { \
329e607d 776 val = cpu_ldq_kernel(env, sp); \
20054ef0
BS		 777 sp += 8; \
778 }
eaa728ee 779
2999a0b2 780static inline target_ulong get_rsp_from_tss(CPUX86State *env, int level)
eaa728ee
FB		 781{
782 int index;
783
784#if 0
785 printf("TR: base=" TARGET_FMT_lx " limit=%x\n",
786 env->tr.base, env->tr.limit);
787#endif
788
20054ef0 789 if (!(env->tr.flags & DESC_P_MASK)) {
eaa728ee 790 cpu_abort(env, "invalid tss");
20054ef0 791 }
eaa728ee 792 index = 8 * level + 4;
20054ef0 793 if ((index + 7) > env->tr.limit) {
77b2bc2c 794 raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
20054ef0 795 }
329e607d 796 return cpu_ldq_kernel(env, env->tr.base + index);
eaa728ee
FB		 797}
798
799/* 64 bit interrupt */
2999a0b2
BS		 800static void do_interrupt64(CPUX86State *env, int intno, int is_int,
801 int error_code, target_ulong next_eip, int is_hw)
eaa728ee
FB		 802{
803 SegmentCache *dt;
804 target_ulong ptr;
805 int type, dpl, selector, cpl, ist;
806 int has_error_code, new_stack;
807 uint32_t e1, e2, e3, ss;
808 target_ulong old_eip, esp, offset;
eaa728ee 809
eaa728ee 810 has_error_code = 0;
20054ef0
BS		 811 if (!is_int && !is_hw) {
812 has_error_code = exception_has_error_code(intno);
813 }
814 if (is_int) {
eaa728ee 815 old_eip = next_eip;
20054ef0 816 } else {
eaa728ee 817 old_eip = env->eip;
20054ef0 818 }
eaa728ee
FB		 819
820 dt = &env->idt;
20054ef0 821 if (intno * 16 + 15 > dt->limit) {
77b2bc2c 822 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
20054ef0 823 }
eaa728ee 824 ptr = dt->base + intno * 16;
329e607d
BS		 825 e1 = cpu_ldl_kernel(env, ptr);
826 e2 = cpu_ldl_kernel(env, ptr + 4);
827 e3 = cpu_ldl_kernel(env, ptr + 8);
eaa728ee
FB		 828 /* check gate type */
829 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
20054ef0 830 switch (type) {
eaa728ee
FB		 831 case 14: /* 386 interrupt gate */
832 case 15: /* 386 trap gate */
833 break;
834 default:
77b2bc2c 835 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
eaa728ee
FB		 836 break;
837 }
838 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
839 cpl = env->hflags & HF_CPL_MASK;
1235fc06 840 /* check privilege if software int */
20054ef0 841 if (is_int && dpl < cpl) {
77b2bc2c 842 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
20054ef0 843 }
eaa728ee 844 /* check valid bit */
20054ef0 845 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 846 raise_exception_err(env, EXCP0B_NOSEG, intno * 16 + 2);
20054ef0 847 }
eaa728ee
FB		 848 selector = e1 >> 16;
849 offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff);
850 ist = e2 & 7;
20054ef0 851 if ((selector & 0xfffc) == 0) {
77b2bc2c 852 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 853 }
eaa728ee 854
2999a0b2 855 if (load_segment(env, &e1, &e2, selector) != 0) {
77b2bc2c 856 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 857 }
858 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
77b2bc2c 859 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 860 }
eaa728ee 861 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 862 if (dpl > cpl) {
77b2bc2c 863 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 864 }
865 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 866 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0
BS		 867 }
868 if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK)) {
77b2bc2c 869 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 870 }
eaa728ee
FB		 871 if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) {
872 /* to inner privilege */
20054ef0 873 if (ist != 0) {
2999a0b2 874 esp = get_rsp_from_tss(env, ist + 3);
20054ef0 875 } else {
2999a0b2 876 esp = get_rsp_from_tss(env, dpl);
20054ef0 877 }
eaa728ee
FB		 878 esp &= ~0xfLL; /* align stack */
879 ss = 0;
880 new_stack = 1;
881 } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
882 /* to same privilege */
20054ef0 883 if (env->eflags & VM_MASK) {
77b2bc2c 884 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 885 }
eaa728ee 886 new_stack = 0;
20054ef0 887 if (ist != 0) {
2999a0b2 888 esp = get_rsp_from_tss(env, ist + 3);
20054ef0 889 } else {
eaa728ee 890 esp = ESP;
20054ef0 891 }
eaa728ee
FB		 892 esp &= ~0xfLL; /* align stack */
893 dpl = cpl;
894 } else {
77b2bc2c 895 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
eaa728ee
FB		 896 new_stack = 0; /* avoid warning */
897 esp = 0; /* avoid warning */
898 }
899
900 PUSHQ(esp, env->segs[R_SS].selector);
901 PUSHQ(esp, ESP);
997ff0d9 902 PUSHQ(esp, cpu_compute_eflags(env));
eaa728ee
FB		 903 PUSHQ(esp, env->segs[R_CS].selector);
904 PUSHQ(esp, old_eip);
905 if (has_error_code) {
906 PUSHQ(esp, error_code);
907 }
908
909 if (new_stack) {
910 ss = 0 | dpl;
911 cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0);
912 }
913 ESP = esp;
914
915 selector = (selector & ~3) | dpl;
916 cpu_x86_load_seg_cache(env, R_CS, selector,
917 get_seg_base(e1, e2),
918 get_seg_limit(e1, e2),
919 e2);
920 cpu_x86_set_cpl(env, dpl);
921 env->eip = offset;
922
923 /* interrupt gate clear IF mask */
924 if ((type & 1) == 0) {
925 env->eflags &= ~IF_MASK;
926 }
927 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
928}
929#endif
930
d9957a8b 931#ifdef TARGET_X86_64
eaa728ee 932#if defined(CONFIG_USER_ONLY)
2999a0b2 933void helper_syscall(CPUX86State *env, int next_eip_addend)
eaa728ee
FB		 934{
935 env->exception_index = EXCP_SYSCALL;
936 env->exception_next_eip = env->eip + next_eip_addend;
1162c041 937 cpu_loop_exit(env);
eaa728ee
FB		 938}
939#else
2999a0b2 940void helper_syscall(CPUX86State *env, int next_eip_addend)
eaa728ee
FB		 941{
942 int selector;
943
944 if (!(env->efer & MSR_EFER_SCE)) {
77b2bc2c 945 raise_exception_err(env, EXCP06_ILLOP, 0);
eaa728ee
FB		 946 }
947 selector = (env->star >> 32) & 0xffff;
eaa728ee
FB		 948 if (env->hflags & HF_LMA_MASK) {
949 int code64;
950
951 ECX = env->eip + next_eip_addend;
997ff0d9 952 env->regs[11] = cpu_compute_eflags(env);
eaa728ee
FB		 953
954 code64 = env->hflags & HF_CS64_MASK;
955
956 cpu_x86_set_cpl(env, 0);
957 cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
958 0, 0xffffffff,
959 DESC_G_MASK | DESC_P_MASK |
960 DESC_S_MASK |
20054ef0
BS		 961 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
962 DESC_L_MASK);
eaa728ee
FB		 963 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
964 0, 0xffffffff,
965 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
966 DESC_S_MASK |
967 DESC_W_MASK | DESC_A_MASK);
968 env->eflags &= ~env->fmask;
997ff0d9 969 cpu_load_eflags(env, env->eflags, 0);
20054ef0 970 if (code64) {
eaa728ee 971 env->eip = env->lstar;
20054ef0 972 } else {
eaa728ee 973 env->eip = env->cstar;
20054ef0 974 }
d9957a8b 975 } else {
eaa728ee
FB		 976 ECX = (uint32_t)(env->eip + next_eip_addend);
977
978 cpu_x86_set_cpl(env, 0);
979 cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
980 0, 0xffffffff,
981 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
982 DESC_S_MASK |
983 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
984 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
985 0, 0xffffffff,
986 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
987 DESC_S_MASK |
988 DESC_W_MASK | DESC_A_MASK);
989 env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
990 env->eip = (uint32_t)env->star;
991 }
992}
993#endif
d9957a8b 994#endif
eaa728ee 995
d9957a8b 996#ifdef TARGET_X86_64
2999a0b2 997void helper_sysret(CPUX86State *env, int dflag)
eaa728ee
FB		 998{
999 int cpl, selector;
1000
1001 if (!(env->efer & MSR_EFER_SCE)) {
77b2bc2c 1002 raise_exception_err(env, EXCP06_ILLOP, 0);
eaa728ee
FB		 1003 }
1004 cpl = env->hflags & HF_CPL_MASK;
1005 if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) {
77b2bc2c 1006 raise_exception_err(env, EXCP0D_GPF, 0);
eaa728ee
FB		 1007 }
1008 selector = (env->star >> 48) & 0xffff;
eaa728ee
FB		 1009 if (env->hflags & HF_LMA_MASK) {
1010 if (dflag == 2) {
1011 cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3,
1012 0, 0xffffffff,
1013 DESC_G_MASK | DESC_P_MASK |
1014 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1015 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
1016 DESC_L_MASK);
1017 env->eip = ECX;
1018 } else {
1019 cpu_x86_load_seg_cache(env, R_CS, selector | 3,
1020 0, 0xffffffff,
1021 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1022 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1023 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
1024 env->eip = (uint32_t)ECX;
1025 }
1026 cpu_x86_load_seg_cache(env, R_SS, selector + 8,
1027 0, 0xffffffff,
1028 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1029 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1030 DESC_W_MASK | DESC_A_MASK);
997ff0d9
BS		 1031 cpu_load_eflags(env, (uint32_t)(env->regs[11]), TF_MASK | AC_MASK
1032 | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK |
1033 NT_MASK);
eaa728ee 1034 cpu_x86_set_cpl(env, 3);
d9957a8b 1035 } else {
eaa728ee
FB		 1036 cpu_x86_load_seg_cache(env, R_CS, selector | 3,
1037 0, 0xffffffff,
1038 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1039 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1040 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
1041 env->eip = (uint32_t)ECX;
1042 cpu_x86_load_seg_cache(env, R_SS, selector + 8,
1043 0, 0xffffffff,
1044 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1045 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1046 DESC_W_MASK | DESC_A_MASK);
1047 env->eflags |= IF_MASK;
1048 cpu_x86_set_cpl(env, 3);
1049 }
eaa728ee 1050}
d9957a8b 1051#endif
eaa728ee
FB		 1052
1053/* real mode interrupt */
2999a0b2
BS		 1054static void do_interrupt_real(CPUX86State *env, int intno, int is_int,
1055 int error_code, unsigned int next_eip)
eaa728ee
FB		 1056{
1057 SegmentCache *dt;
1058 target_ulong ptr, ssp;
1059 int selector;
1060 uint32_t offset, esp;
1061 uint32_t old_cs, old_eip;
eaa728ee 1062
20054ef0 1063 /* real mode (simpler!) */
eaa728ee 1064 dt = &env->idt;
20054ef0 1065 if (intno * 4 + 3 > dt->limit) {
77b2bc2c 1066 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
20054ef0 1067 }
eaa728ee 1068 ptr = dt->base + intno * 4;
329e607d
BS		 1069 offset = cpu_lduw_kernel(env, ptr);
1070 selector = cpu_lduw_kernel(env, ptr + 2);
eaa728ee
FB		 1071 esp = ESP;
1072 ssp = env->segs[R_SS].base;
20054ef0 1073 if (is_int) {
eaa728ee 1074 old_eip = next_eip;
20054ef0 1075 } else {
eaa728ee 1076 old_eip = env->eip;
20054ef0 1077 }
eaa728ee 1078 old_cs = env->segs[R_CS].selector;
20054ef0 1079 /* XXX: use SS segment size? */
997ff0d9 1080 PUSHW(ssp, esp, 0xffff, cpu_compute_eflags(env));
eaa728ee
FB		 1081 PUSHW(ssp, esp, 0xffff, old_cs);
1082 PUSHW(ssp, esp, 0xffff, old_eip);
1083
1084 /* update processor state */
1085 ESP = (ESP & ~0xffff) | (esp & 0xffff);
1086 env->eip = offset;
1087 env->segs[R_CS].selector = selector;
1088 env->segs[R_CS].base = (selector << 4);
1089 env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK);
1090}
1091
e694d4e2 1092#if defined(CONFIG_USER_ONLY)
eaa728ee 1093/* fake user mode interrupt */
2999a0b2
BS		 1094static void do_interrupt_user(CPUX86State *env, int intno, int is_int,
1095 int error_code, target_ulong next_eip)
eaa728ee
FB		 1096{
1097 SegmentCache *dt;
1098 target_ulong ptr;
1099 int dpl, cpl, shift;
1100 uint32_t e2;
1101
1102 dt = &env->idt;
1103 if (env->hflags & HF_LMA_MASK) {
1104 shift = 4;
1105 } else {
1106 shift = 3;
1107 }
1108 ptr = dt->base + (intno << shift);
329e607d 1109 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee
FB		 1110
1111 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1112 cpl = env->hflags & HF_CPL_MASK;
1235fc06 1113 /* check privilege if software int */
20054ef0 1114 if (is_int && dpl < cpl) {
77b2bc2c 1115 raise_exception_err(env, EXCP0D_GPF, (intno << shift) + 2);
20054ef0 1116 }
eaa728ee
FB		 1117
1118 /* Since we emulate only user space, we cannot do more than
1119 exiting the emulation with the suitable exception and error
1120 code */
20054ef0 1121 if (is_int) {
eaa728ee 1122 EIP = next_eip;
20054ef0 1123 }
eaa728ee
FB		 1124}
1125
e694d4e2
BS		 1126#else
1127
2999a0b2
BS		 1128static void handle_even_inj(CPUX86State *env, int intno, int is_int,
1129 int error_code, int is_hw, int rm)
2ed51f5b 1130{
20054ef0
BS		 1131 uint32_t event_inj = ldl_phys(env->vm_vmcb + offsetof(struct vmcb,
1132 control.event_inj));
1133
2ed51f5b 1134 if (!(event_inj & SVM_EVTINJ_VALID)) {
20054ef0
BS		 1135 int type;
1136
1137 if (is_int) {
1138 type = SVM_EVTINJ_TYPE_SOFT;
1139 } else {
1140 type = SVM_EVTINJ_TYPE_EXEPT;
1141 }
1142 event_inj = intno | type | SVM_EVTINJ_VALID;
1143 if (!rm && exception_has_error_code(intno)) {
1144 event_inj |= SVM_EVTINJ_VALID_ERR;
1145 stl_phys(env->vm_vmcb + offsetof(struct vmcb,
1146 control.event_inj_err),
1147 error_code);
1148 }
1149 stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
1150 event_inj);
2ed51f5b
AL		 1151 }
1152}
00ea18d1 1153#endif
2ed51f5b 1154
eaa728ee
FB		 1155/*
1156 * Begin execution of an interruption. is_int is TRUE if coming from
1157 * the int instruction. next_eip is the EIP value AFTER the interrupt
1158 * instruction. It is only relevant if is_int is TRUE.
1159 */
2999a0b2
BS		 1160static void do_interrupt_all(CPUX86State *env, int intno, int is_int,
1161 int error_code, target_ulong next_eip, int is_hw)
eaa728ee 1162{
8fec2b8c 1163 if (qemu_loglevel_mask(CPU_LOG_INT)) {
eaa728ee
FB		 1164 if ((env->cr[0] & CR0_PE_MASK)) {
1165 static int count;
20054ef0
BS		 1166
1167 qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx
1168 " pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx,
1169 count, intno, error_code, is_int,
1170 env->hflags & HF_CPL_MASK,
1171 env->segs[R_CS].selector, EIP,
1172 (int)env->segs[R_CS].base + EIP,
1173 env->segs[R_SS].selector, ESP);
eaa728ee 1174 if (intno == 0x0e) {
93fcfe39 1175 qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]);
eaa728ee 1176 } else {
93fcfe39 1177 qemu_log(" EAX=" TARGET_FMT_lx, EAX);
eaa728ee 1178 }
93fcfe39 1179 qemu_log("\n");
6fd2a026 1180 log_cpu_state(env, CPU_DUMP_CCOP);
eaa728ee
FB		 1181#if 0
1182 {
1183 int i;
9bd5494e 1184 target_ulong ptr;
20054ef0 1185
93fcfe39 1186 qemu_log(" code=");
eaa728ee 1187 ptr = env->segs[R_CS].base + env->eip;
20054ef0 1188 for (i = 0; i < 16; i++) {
93fcfe39 1189 qemu_log(" %02x", ldub(ptr + i));
eaa728ee 1190 }
93fcfe39 1191 qemu_log("\n");
eaa728ee
FB		 1192 }
1193#endif
1194 count++;
1195 }
1196 }
1197 if (env->cr[0] & CR0_PE_MASK) {
00ea18d1 1198#if !defined(CONFIG_USER_ONLY)
20054ef0 1199 if (env->hflags & HF_SVMI_MASK) {
2999a0b2 1200 handle_even_inj(env, intno, is_int, error_code, is_hw, 0);
20054ef0 1201 }
00ea18d1 1202#endif
eb38c52c 1203#ifdef TARGET_X86_64
eaa728ee 1204 if (env->hflags & HF_LMA_MASK) {
2999a0b2 1205 do_interrupt64(env, intno, is_int, error_code, next_eip, is_hw);
eaa728ee
FB		 1206 } else
1207#endif
1208 {
2999a0b2
BS		 1209 do_interrupt_protected(env, intno, is_int, error_code, next_eip,
1210 is_hw);
eaa728ee
FB		 1211 }
1212 } else {
00ea18d1 1213#if !defined(CONFIG_USER_ONLY)
20054ef0 1214 if (env->hflags & HF_SVMI_MASK) {
2999a0b2 1215 handle_even_inj(env, intno, is_int, error_code, is_hw, 1);
20054ef0 1216 }
00ea18d1 1217#endif
2999a0b2 1218 do_interrupt_real(env, intno, is_int, error_code, next_eip);
eaa728ee 1219 }
2ed51f5b 1220
00ea18d1 1221#if !defined(CONFIG_USER_ONLY)
2ed51f5b 1222 if (env->hflags & HF_SVMI_MASK) {
20054ef0
BS		 1223 uint32_t event_inj = ldl_phys(env->vm_vmcb +
1224 offsetof(struct vmcb,
1225 control.event_inj));
1226
1227 stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
1228 event_inj & ~SVM_EVTINJ_VALID);
2ed51f5b 1229 }
00ea18d1 1230#endif
eaa728ee
FB		 1231}
1232
2999a0b2 1233void do_interrupt(CPUX86State *env)
e694d4e2 1234{
e694d4e2
BS		 1235#if defined(CONFIG_USER_ONLY)
1236 /* if user mode only, we simulate a fake exception
1237 which will be handled outside the cpu execution
1238 loop */
2999a0b2 1239 do_interrupt_user(env, env->exception_index,
e694d4e2
BS		 1240 env->exception_is_int,
1241 env->error_code,
1242 env->exception_next_eip);
1243 /* successfully delivered */
1244 env->old_exception = -1;
1245#else
1246 /* simulate a real cpu exception. On i386, it can
1247 trigger new exceptions, but we do not handle
1248 double or triple faults yet. */
2999a0b2 1249 do_interrupt_all(env, env->exception_index,
e694d4e2
BS		 1250 env->exception_is_int,
1251 env->error_code,
1252 env->exception_next_eip, 0);
1253 /* successfully delivered */
1254 env->old_exception = -1;
1255#endif
e694d4e2
BS		 1256}
1257
2999a0b2 1258void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw)
e694d4e2 1259{
2999a0b2 1260 do_interrupt_all(env, intno, 0, 0, 0, is_hw);
e694d4e2
BS		 1261}
1262
2999a0b2
BS		 1263void helper_enter_level(CPUX86State *env, int level, int data32,
1264 target_ulong t1)
eaa728ee
FB		 1265{
1266 target_ulong ssp;
1267 uint32_t esp_mask, esp, ebp;
1268
1269 esp_mask = get_sp_mask(env->segs[R_SS].flags);
1270 ssp = env->segs[R_SS].base;
1271 ebp = EBP;
1272 esp = ESP;
1273 if (data32) {
1274 /* 32 bit */
1275 esp -= 4;
1276 while (--level) {
1277 esp -= 4;
1278 ebp -= 4;
329e607d
BS		 1279 cpu_stl_data(env, ssp + (esp & esp_mask),
1280 cpu_ldl_data(env, ssp + (ebp & esp_mask)));
eaa728ee
FB		 1281 }
1282 esp -= 4;
329e607d 1283 cpu_stl_data(env, ssp + (esp & esp_mask), t1);
eaa728ee
FB		 1284 } else {
1285 /* 16 bit */
1286 esp -= 2;
1287 while (--level) {
1288 esp -= 2;
1289 ebp -= 2;
329e607d
BS		 1290 cpu_stw_data(env, ssp + (esp & esp_mask),
1291 cpu_lduw_data(env, ssp + (ebp & esp_mask)));
eaa728ee
FB		 1292 }
1293 esp -= 2;
329e607d 1294 cpu_stw_data(env, ssp + (esp & esp_mask), t1);
eaa728ee
FB		 1295 }
1296}
1297
1298#ifdef TARGET_X86_64
2999a0b2
BS		 1299void helper_enter64_level(CPUX86State *env, int level, int data64,
1300 target_ulong t1)
eaa728ee
FB		 1301{
1302 target_ulong esp, ebp;
20054ef0 1303
eaa728ee
FB		 1304 ebp = EBP;
1305 esp = ESP;
1306
1307 if (data64) {
1308 /* 64 bit */
1309 esp -= 8;
1310 while (--level) {
1311 esp -= 8;
1312 ebp -= 8;
329e607d 1313 cpu_stq_data(env, esp, cpu_ldq_data(env, ebp));
eaa728ee
FB		 1314 }
1315 esp -= 8;
329e607d 1316 cpu_stq_data(env, esp, t1);
eaa728ee
FB		 1317 } else {
1318 /* 16 bit */
1319 esp -= 2;
1320 while (--level) {
1321 esp -= 2;
1322 ebp -= 2;
329e607d 1323 cpu_stw_data(env, esp, cpu_lduw_data(env, ebp));
eaa728ee
FB		 1324 }
1325 esp -= 2;
329e607d 1326 cpu_stw_data(env, esp, t1);
eaa728ee
FB		 1327 }
1328}
1329#endif
1330
2999a0b2 1331void helper_lldt(CPUX86State *env, int selector)
eaa728ee
FB		 1332{
1333 SegmentCache *dt;
1334 uint32_t e1, e2;
1335 int index, entry_limit;
1336 target_ulong ptr;
1337
1338 selector &= 0xffff;
1339 if ((selector & 0xfffc) == 0) {
1340 /* XXX: NULL selector case: invalid LDT */
1341 env->ldt.base = 0;
1342 env->ldt.limit = 0;
1343 } else {
20054ef0 1344 if (selector & 0x4) {
77b2bc2c 1345 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1346 }
eaa728ee
FB		 1347 dt = &env->gdt;
1348 index = selector & ~7;
1349#ifdef TARGET_X86_64
20054ef0 1350 if (env->hflags & HF_LMA_MASK) {
eaa728ee 1351 entry_limit = 15;
20054ef0 1352 } else
eaa728ee 1353#endif
20054ef0 1354 {
eaa728ee 1355 entry_limit = 7;
20054ef0
BS		 1356 }
1357 if ((index + entry_limit) > dt->limit) {
77b2bc2c 1358 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1359 }
eaa728ee 1360 ptr = dt->base + index;
329e607d
BS		 1361 e1 = cpu_ldl_kernel(env, ptr);
1362 e2 = cpu_ldl_kernel(env, ptr + 4);
20054ef0 1363 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
77b2bc2c 1364 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 1365 }
1366 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1367 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 1368 }
eaa728ee
FB		 1369#ifdef TARGET_X86_64
1370 if (env->hflags & HF_LMA_MASK) {
1371 uint32_t e3;
20054ef0 1372
329e607d 1373 e3 = cpu_ldl_kernel(env, ptr + 8);
eaa728ee
FB		 1374 load_seg_cache_raw_dt(&env->ldt, e1, e2);
1375 env->ldt.base |= (target_ulong)e3 << 32;
1376 } else
1377#endif
1378 {
1379 load_seg_cache_raw_dt(&env->ldt, e1, e2);
1380 }
1381 }
1382 env->ldt.selector = selector;
1383}
1384
2999a0b2 1385void helper_ltr(CPUX86State *env, int selector)
eaa728ee
FB		 1386{
1387 SegmentCache *dt;
1388 uint32_t e1, e2;
1389 int index, type, entry_limit;
1390 target_ulong ptr;
1391
1392 selector &= 0xffff;
1393 if ((selector & 0xfffc) == 0) {
1394 /* NULL selector case: invalid TR */
1395 env->tr.base = 0;
1396 env->tr.limit = 0;
1397 env->tr.flags = 0;
1398 } else {
20054ef0 1399 if (selector & 0x4) {
77b2bc2c 1400 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1401 }
eaa728ee
FB		 1402 dt = &env->gdt;
1403 index = selector & ~7;
1404#ifdef TARGET_X86_64
20054ef0 1405 if (env->hflags & HF_LMA_MASK) {
eaa728ee 1406 entry_limit = 15;
20054ef0 1407 } else
eaa728ee 1408#endif
20054ef0 1409 {
eaa728ee 1410 entry_limit = 7;
20054ef0
BS		 1411 }
1412 if ((index + entry_limit) > dt->limit) {
77b2bc2c 1413 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1414 }
eaa728ee 1415 ptr = dt->base + index;
329e607d
BS		 1416 e1 = cpu_ldl_kernel(env, ptr);
1417 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee
FB		 1418 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
1419 if ((e2 & DESC_S_MASK) ||
20054ef0 1420 (type != 1 && type != 9)) {
77b2bc2c 1421 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 1422 }
1423 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1424 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 1425 }
eaa728ee
FB		 1426#ifdef TARGET_X86_64
1427 if (env->hflags & HF_LMA_MASK) {
1428 uint32_t e3, e4;
20054ef0 1429
329e607d
BS		 1430 e3 = cpu_ldl_kernel(env, ptr + 8);
1431 e4 = cpu_ldl_kernel(env, ptr + 12);
20054ef0 1432 if ((e4 >> DESC_TYPE_SHIFT) & 0xf) {
77b2bc2c 1433 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1434 }
eaa728ee
FB		 1435 load_seg_cache_raw_dt(&env->tr, e1, e2);
1436 env->tr.base |= (target_ulong)e3 << 32;
1437 } else
1438#endif
1439 {
1440 load_seg_cache_raw_dt(&env->tr, e1, e2);
1441 }
1442 e2 |= DESC_TSS_BUSY_MASK;
329e607d 1443 cpu_stl_kernel(env, ptr + 4, e2);
eaa728ee
FB		 1444 }
1445 env->tr.selector = selector;
1446}
1447
1448/* only works if protected mode and not VM86. seg_reg must be != R_CS */
2999a0b2 1449void helper_load_seg(CPUX86State *env, int seg_reg, int selector)
eaa728ee
FB		 1450{
1451 uint32_t e1, e2;
1452 int cpl, dpl, rpl;
1453 SegmentCache *dt;
1454 int index;
1455 target_ulong ptr;
1456
1457 selector &= 0xffff;
1458 cpl = env->hflags & HF_CPL_MASK;
1459 if ((selector & 0xfffc) == 0) {
1460 /* null selector case */
1461 if (seg_reg == R_SS
1462#ifdef TARGET_X86_64
1463 && (!(env->hflags & HF_CS64_MASK) || cpl == 3)
1464#endif
20054ef0 1465 ) {
77b2bc2c 1466 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 1467 }
eaa728ee
FB		 1468 cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0);
1469 } else {
1470
20054ef0 1471 if (selector & 0x4) {
eaa728ee 1472 dt = &env->ldt;
20054ef0 1473 } else {
eaa728ee 1474 dt = &env->gdt;
20054ef0 1475 }
eaa728ee 1476 index = selector & ~7;
20054ef0 1477 if ((index + 7) > dt->limit) {
77b2bc2c 1478 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1479 }
eaa728ee 1480 ptr = dt->base + index;
329e607d
BS		 1481 e1 = cpu_ldl_kernel(env, ptr);
1482 e2 = cpu_ldl_kernel(env, ptr + 4);
eaa728ee 1483
20054ef0 1484 if (!(e2 & DESC_S_MASK)) {
77b2bc2c 1485 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1486 }
eaa728ee
FB		 1487 rpl = selector & 3;
1488 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1489 if (seg_reg == R_SS) {
1490 /* must be writable segment */
20054ef0 1491 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
77b2bc2c 1492 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 1493 }
1494 if (rpl != cpl || dpl != cpl) {
77b2bc2c 1495 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1496 }
eaa728ee
FB		 1497 } else {
1498 /* must be readable segment */
20054ef0 1499 if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) {
77b2bc2c 1500 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1501 }
eaa728ee
FB		 1502
1503 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
1504 /* if not conforming code, test rights */
20054ef0 1505 if (dpl < cpl || dpl < rpl) {
77b2bc2c 1506 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1507 }
eaa728ee
FB		 1508 }
1509 }
1510
1511 if (!(e2 & DESC_P_MASK)) {
20054ef0 1512 if (seg_reg == R_SS) {
77b2bc2c 1513 raise_exception_err(env, EXCP0C_STACK, selector & 0xfffc);
20054ef0 1514 } else {
77b2bc2c 1515 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 1516 }
eaa728ee
FB		 1517 }
1518
1519 /* set the access bit if not already set */
1520 if (!(e2 & DESC_A_MASK)) {
1521 e2 |= DESC_A_MASK;
329e607d 1522 cpu_stl_kernel(env, ptr + 4, e2);
eaa728ee
FB		 1523 }
1524
1525 cpu_x86_load_seg_cache(env, seg_reg, selector,
1526 get_seg_base(e1, e2),
1527 get_seg_limit(e1, e2),
1528 e2);
1529#if 0
93fcfe39 1530 qemu_log("load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n",
eaa728ee
FB		 1531 selector, (unsigned long)sc->base, sc->limit, sc->flags);
1532#endif
1533 }
1534}
1535
1536/* protected mode jump */
2999a0b2 1537void helper_ljmp_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
eaa728ee
FB		 1538 int next_eip_addend)
1539{
1540 int gate_cs, type;
1541 uint32_t e1, e2, cpl, dpl, rpl, limit;
1542 target_ulong next_eip;
1543
20054ef0 1544 if ((new_cs & 0xfffc) == 0) {
77b2bc2c 1545 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 1546 }
2999a0b2 1547 if (load_segment(env, &e1, &e2, new_cs) != 0) {
77b2bc2c 1548 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1549 }
eaa728ee
FB		 1550 cpl = env->hflags & HF_CPL_MASK;
1551 if (e2 & DESC_S_MASK) {
20054ef0 1552 if (!(e2 & DESC_CS_MASK)) {
77b2bc2c 1553 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1554 }
eaa728ee
FB		 1555 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1556 if (e2 & DESC_C_MASK) {
1557 /* conforming code segment */
20054ef0 1558 if (dpl > cpl) {
77b2bc2c 1559 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1560 }
eaa728ee
FB		 1561 } else {
1562 /* non conforming code segment */
1563 rpl = new_cs & 3;
20054ef0 1564 if (rpl > cpl) {
77b2bc2c 1565 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0
BS		 1566 }
1567 if (dpl != cpl) {
77b2bc2c 1568 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1569 }
eaa728ee 1570 }
20054ef0 1571 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1572 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
20054ef0 1573 }
eaa728ee
FB		 1574 limit = get_seg_limit(e1, e2);
1575 if (new_eip > limit &&
20054ef0 1576 !(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK)) {
77b2bc2c 1577 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1578 }
eaa728ee
FB		 1579 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1580 get_seg_base(e1, e2), limit, e2);
1581 EIP = new_eip;
1582 } else {
1583 /* jump to call or task gate */
1584 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1585 rpl = new_cs & 3;
1586 cpl = env->hflags & HF_CPL_MASK;
1587 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 1588 switch (type) {
eaa728ee
FB		 1589 case 1: /* 286 TSS */
1590 case 9: /* 386 TSS */
1591 case 5: /* task gate */
20054ef0 1592 if (dpl < cpl || dpl < rpl) {
77b2bc2c 1593 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1594 }
eaa728ee 1595 next_eip = env->eip + next_eip_addend;
2999a0b2 1596 switch_tss(env, new_cs, e1, e2, SWITCH_TSS_JMP, next_eip);
eaa728ee
FB		 1597 CC_OP = CC_OP_EFLAGS;
1598 break;
1599 case 4: /* 286 call gate */
1600 case 12: /* 386 call gate */
20054ef0 1601 if ((dpl < cpl) || (dpl < rpl)) {
77b2bc2c 1602 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0
BS		 1603 }
1604 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1605 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
20054ef0 1606 }
eaa728ee
FB		 1607 gate_cs = e1 >> 16;
1608 new_eip = (e1 & 0xffff);
20054ef0 1609 if (type == 12) {
eaa728ee 1610 new_eip |= (e2 & 0xffff0000);
20054ef0 1611 }
2999a0b2 1612 if (load_segment(env, &e1, &e2, gate_cs) != 0) {
77b2bc2c 1613 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
20054ef0 1614 }
eaa728ee
FB		 1615 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1616 /* must be code segment */
1617 if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) !=
20054ef0 1618 (DESC_S_MASK | DESC_CS_MASK))) {
77b2bc2c 1619 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
20054ef0 1620 }
eaa728ee 1621 if (((e2 & DESC_C_MASK) && (dpl > cpl)) ||
20054ef0 1622 (!(e2 & DESC_C_MASK) && (dpl != cpl))) {
77b2bc2c 1623 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
20054ef0
BS		 1624 }
1625 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1626 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
20054ef0 1627 }
eaa728ee 1628 limit = get_seg_limit(e1, e2);
20054ef0 1629 if (new_eip > limit) {
77b2bc2c 1630 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 1631 }
eaa728ee
FB		 1632 cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl,
1633 get_seg_base(e1, e2), limit, e2);
1634 EIP = new_eip;
1635 break;
1636 default:
77b2bc2c 1637 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
eaa728ee
FB		 1638 break;
1639 }
1640 }
1641}
1642
1643/* real mode call */
2999a0b2 1644void helper_lcall_real(CPUX86State *env, int new_cs, target_ulong new_eip1,
eaa728ee
FB		 1645 int shift, int next_eip)
1646{
1647 int new_eip;
1648 uint32_t esp, esp_mask;
1649 target_ulong ssp;
1650
1651 new_eip = new_eip1;
1652 esp = ESP;
1653 esp_mask = get_sp_mask(env->segs[R_SS].flags);
1654 ssp = env->segs[R_SS].base;
1655 if (shift) {
1656 PUSHL(ssp, esp, esp_mask, env->segs[R_CS].selector);
1657 PUSHL(ssp, esp, esp_mask, next_eip);
1658 } else {
1659 PUSHW(ssp, esp, esp_mask, env->segs[R_CS].selector);
1660 PUSHW(ssp, esp, esp_mask, next_eip);
1661 }
1662
1663 SET_ESP(esp, esp_mask);
1664 env->eip = new_eip;
1665 env->segs[R_CS].selector = new_cs;
1666 env->segs[R_CS].base = (new_cs << 4);
1667}
1668
1669/* protected mode call */
2999a0b2 1670void helper_lcall_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
eaa728ee
FB		 1671 int shift, int next_eip_addend)
1672{
1673 int new_stack, i;
1674 uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count;
1c918eba 1675 uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, sp, type, ss_dpl, sp_mask;
eaa728ee
FB		 1676 uint32_t val, limit, old_sp_mask;
1677 target_ulong ssp, old_ssp, next_eip;
1678
1679 next_eip = env->eip + next_eip_addend;
d12d51d5
AL		 1680 LOG_PCALL("lcall %04x:%08x s=%d\n", new_cs, (uint32_t)new_eip, shift);
1681 LOG_PCALL_STATE(env);
20054ef0 1682 if ((new_cs & 0xfffc) == 0) {
77b2bc2c 1683 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 1684 }
2999a0b2 1685 if (load_segment(env, &e1, &e2, new_cs) != 0) {
77b2bc2c 1686 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1687 }
eaa728ee 1688 cpl = env->hflags & HF_CPL_MASK;
d12d51d5 1689 LOG_PCALL("desc=%08x:%08x\n", e1, e2);
eaa728ee 1690 if (e2 & DESC_S_MASK) {
20054ef0 1691 if (!(e2 & DESC_CS_MASK)) {
77b2bc2c 1692 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1693 }
eaa728ee
FB		 1694 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1695 if (e2 & DESC_C_MASK) {
1696 /* conforming code segment */
20054ef0 1697 if (dpl > cpl) {
77b2bc2c 1698 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1699 }
eaa728ee
FB		 1700 } else {
1701 /* non conforming code segment */
1702 rpl = new_cs & 3;
20054ef0 1703 if (rpl > cpl) {
77b2bc2c 1704 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0
BS		 1705 }
1706 if (dpl != cpl) {
77b2bc2c 1707 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1708 }
eaa728ee 1709 }
20054ef0 1710 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1711 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
20054ef0 1712 }
eaa728ee
FB		 1713
1714#ifdef TARGET_X86_64
1715 /* XXX: check 16/32 bit cases in long mode */
1716 if (shift == 2) {
1717 target_ulong rsp;
20054ef0 1718
eaa728ee
FB		 1719 /* 64 bit case */
1720 rsp = ESP;
1721 PUSHQ(rsp, env->segs[R_CS].selector);
1722 PUSHQ(rsp, next_eip);
1723 /* from this point, not restartable */
1724 ESP = rsp;
1725 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1726 get_seg_base(e1, e2),
1727 get_seg_limit(e1, e2), e2);
1728 EIP = new_eip;
1729 } else
1730#endif
1731 {
1732 sp = ESP;
1733 sp_mask = get_sp_mask(env->segs[R_SS].flags);
1734 ssp = env->segs[R_SS].base;
1735 if (shift) {
1736 PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
1737 PUSHL(ssp, sp, sp_mask, next_eip);
1738 } else {
1739 PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
1740 PUSHW(ssp, sp, sp_mask, next_eip);
1741 }
1742
1743 limit = get_seg_limit(e1, e2);
20054ef0 1744 if (new_eip > limit) {
77b2bc2c 1745 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1746 }
eaa728ee
FB		 1747 /* from this point, not restartable */
1748 SET_ESP(sp, sp_mask);
1749 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1750 get_seg_base(e1, e2), limit, e2);
1751 EIP = new_eip;
1752 }
1753 } else {
1754 /* check gate type */
1755 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
1756 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1757 rpl = new_cs & 3;
20054ef0 1758 switch (type) {
eaa728ee
FB		 1759 case 1: /* available 286 TSS */
1760 case 9: /* available 386 TSS */
1761 case 5: /* task gate */
20054ef0 1762 if (dpl < cpl || dpl < rpl) {
77b2bc2c 1763 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1764 }
2999a0b2 1765 switch_tss(env, new_cs, e1, e2, SWITCH_TSS_CALL, next_eip);
eaa728ee
FB		 1766 CC_OP = CC_OP_EFLAGS;
1767 return;
1768 case 4: /* 286 call gate */
1769 case 12: /* 386 call gate */
1770 break;
1771 default:
77b2bc2c 1772 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
eaa728ee
FB		 1773 break;
1774 }
1775 shift = type >> 3;
1776
20054ef0 1777 if (dpl < cpl || dpl < rpl) {
77b2bc2c 1778 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 1779 }
eaa728ee 1780 /* check valid bit */
20054ef0 1781 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1782 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
20054ef0 1783 }
eaa728ee
FB		 1784 selector = e1 >> 16;
1785 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
1786 param_count = e2 & 0x1f;
20054ef0 1787 if ((selector & 0xfffc) == 0) {
77b2bc2c 1788 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 1789 }
eaa728ee 1790
2999a0b2 1791 if (load_segment(env, &e1, &e2, selector) != 0) {
77b2bc2c 1792 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 1793 }
1794 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
77b2bc2c 1795 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0 1796 }
eaa728ee 1797 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 1798 if (dpl > cpl) {
77b2bc2c 1799 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
20054ef0
BS		 1800 }
1801 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 1802 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
20054ef0 1803 }
eaa728ee
FB		 1804
1805 if (!(e2 & DESC_C_MASK) && dpl < cpl) {
1806 /* to inner privilege */
2999a0b2 1807 get_ss_esp_from_tss(env, &ss, &sp, dpl);
20054ef0
BS		 1808 LOG_PCALL("new ss:esp=%04x:%08x param_count=%d ESP=" TARGET_FMT_lx
1809 "\n",
1810 ss, sp, param_count, ESP);
1811 if ((ss & 0xfffc) == 0) {
77b2bc2c 1812 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0
BS		 1813 }
1814 if ((ss & 3) != dpl) {
77b2bc2c 1815 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 1816 }
2999a0b2 1817 if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
77b2bc2c 1818 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 1819 }
eaa728ee 1820 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 1821 if (ss_dpl != dpl) {
77b2bc2c 1822 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 1823 }
eaa728ee
FB		 1824 if (!(ss_e2 & DESC_S_MASK) ||
1825 (ss_e2 & DESC_CS_MASK) ||
20054ef0 1826 !(ss_e2 & DESC_W_MASK)) {
77b2bc2c 1827 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0
BS		 1828 }
1829 if (!(ss_e2 & DESC_P_MASK)) {
77b2bc2c 1830 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
20054ef0 1831 }
eaa728ee 1832
20054ef0 1833 /* push_size = ((param_count * 2) + 8) << shift; */
eaa728ee
FB		 1834
1835 old_sp_mask = get_sp_mask(env->segs[R_SS].flags);
1836 old_ssp = env->segs[R_SS].base;
1837
1838 sp_mask = get_sp_mask(ss_e2);
1839 ssp = get_seg_base(ss_e1, ss_e2);
1840 if (shift) {
1841 PUSHL(ssp, sp, sp_mask, env->segs[R_SS].selector);
1842 PUSHL(ssp, sp, sp_mask, ESP);
20054ef0 1843 for (i = param_count - 1; i >= 0; i--) {
329e607d
BS		 1844 val = cpu_ldl_kernel(env, old_ssp + ((ESP + i * 4) &
1845 old_sp_mask));
eaa728ee
FB		 1846 PUSHL(ssp, sp, sp_mask, val);
1847 }
1848 } else {
1849 PUSHW(ssp, sp, sp_mask, env->segs[R_SS].selector);
1850 PUSHW(ssp, sp, sp_mask, ESP);
20054ef0 1851 for (i = param_count - 1; i >= 0; i--) {
329e607d
BS		 1852 val = cpu_lduw_kernel(env, old_ssp + ((ESP + i * 2) &
1853 old_sp_mask));
eaa728ee
FB		 1854 PUSHW(ssp, sp, sp_mask, val);
1855 }
1856 }
1857 new_stack = 1;
1858 } else {
1859 /* to same privilege */
1860 sp = ESP;
1861 sp_mask = get_sp_mask(env->segs[R_SS].flags);
1862 ssp = env->segs[R_SS].base;
20054ef0 1863 /* push_size = (4 << shift); */
eaa728ee
FB		 1864 new_stack = 0;
1865 }
1866
1867 if (shift) {
1868 PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
1869 PUSHL(ssp, sp, sp_mask, next_eip);
1870 } else {
1871 PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
1872 PUSHW(ssp, sp, sp_mask, next_eip);
1873 }
1874
1875 /* from this point, not restartable */
1876
1877 if (new_stack) {
1878 ss = (ss & ~3) | dpl;
1879 cpu_x86_load_seg_cache(env, R_SS, ss,
1880 ssp,
1881 get_seg_limit(ss_e1, ss_e2),
1882 ss_e2);
1883 }
1884
1885 selector = (selector & ~3) | dpl;
1886 cpu_x86_load_seg_cache(env, R_CS, selector,
1887 get_seg_base(e1, e2),
1888 get_seg_limit(e1, e2),
1889 e2);
1890 cpu_x86_set_cpl(env, dpl);
1891 SET_ESP(sp, sp_mask);
1892 EIP = offset;
1893 }
eaa728ee
FB		 1894}
1895
1896/* real and vm86 mode iret */
2999a0b2 1897void helper_iret_real(CPUX86State *env, int shift)
eaa728ee
FB		 1898{
1899 uint32_t sp, new_cs, new_eip, new_eflags, sp_mask;
1900 target_ulong ssp;
1901 int eflags_mask;
1902
20054ef0 1903 sp_mask = 0xffff; /* XXXX: use SS segment size? */
eaa728ee
FB		 1904 sp = ESP;
1905 ssp = env->segs[R_SS].base;
1906 if (shift == 1) {
1907 /* 32 bits */
1908 POPL(ssp, sp, sp_mask, new_eip);
1909 POPL(ssp, sp, sp_mask, new_cs);
1910 new_cs &= 0xffff;
1911 POPL(ssp, sp, sp_mask, new_eflags);
1912 } else {
1913 /* 16 bits */
1914 POPW(ssp, sp, sp_mask, new_eip);
1915 POPW(ssp, sp, sp_mask, new_cs);
1916 POPW(ssp, sp, sp_mask, new_eflags);
1917 }
1918 ESP = (ESP & ~sp_mask) | (sp & sp_mask);
bdadc0b5 1919 env->segs[R_CS].selector = new_cs;
1920 env->segs[R_CS].base = (new_cs << 4);
eaa728ee 1921 env->eip = new_eip;
20054ef0
BS		 1922 if (env->eflags & VM_MASK) {
1923 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK |
1924 NT_MASK;
1925 } else {
1926 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK |
1927 RF_MASK | NT_MASK;
1928 }
1929 if (shift == 0) {
eaa728ee 1930 eflags_mask &= 0xffff;
20054ef0 1931 }
997ff0d9 1932 cpu_load_eflags(env, new_eflags, eflags_mask);
db620f46 1933 env->hflags2 &= ~HF2_NMI_MASK;
eaa728ee
FB		 1934}
1935
2999a0b2 1936static inline void validate_seg(CPUX86State *env, int seg_reg, int cpl)
eaa728ee
FB		 1937{
1938 int dpl;
1939 uint32_t e2;
1940
1941 /* XXX: on x86_64, we do not want to nullify FS and GS because
1942 they may still contain a valid base. I would be interested to
1943 know how a real x86_64 CPU behaves */
1944 if ((seg_reg == R_FS || seg_reg == R_GS) &&
20054ef0 1945 (env->segs[seg_reg].selector & 0xfffc) == 0) {
eaa728ee 1946 return;
20054ef0 1947 }
eaa728ee
FB		 1948
1949 e2 = env->segs[seg_reg].flags;
1950 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1951 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
1952 /* data or non conforming code segment */
1953 if (dpl < cpl) {
1954 cpu_x86_load_seg_cache(env, seg_reg, 0, 0, 0, 0);
1955 }
1956 }
1957}
1958
1959/* protected mode iret */
2999a0b2
BS		 1960static inline void helper_ret_protected(CPUX86State *env, int shift,
1961 int is_iret, int addend)
eaa728ee
FB		 1962{
1963 uint32_t new_cs, new_eflags, new_ss;
1964 uint32_t new_es, new_ds, new_fs, new_gs;
1965 uint32_t e1, e2, ss_e1, ss_e2;
1966 int cpl, dpl, rpl, eflags_mask, iopl;
1967 target_ulong ssp, sp, new_eip, new_esp, sp_mask;
1968
1969#ifdef TARGET_X86_64
20054ef0 1970 if (shift == 2) {
eaa728ee 1971 sp_mask = -1;
20054ef0 1972 } else
eaa728ee 1973#endif
20054ef0 1974 {
eaa728ee 1975 sp_mask = get_sp_mask(env->segs[R_SS].flags);
20054ef0 1976 }
eaa728ee
FB		 1977 sp = ESP;
1978 ssp = env->segs[R_SS].base;
1979 new_eflags = 0; /* avoid warning */
1980#ifdef TARGET_X86_64
1981 if (shift == 2) {
1982 POPQ(sp, new_eip);
1983 POPQ(sp, new_cs);
1984 new_cs &= 0xffff;
1985 if (is_iret) {
1986 POPQ(sp, new_eflags);
1987 }
1988 } else
1989#endif
20054ef0
BS		 1990 {
1991 if (shift == 1) {
1992 /* 32 bits */
1993 POPL(ssp, sp, sp_mask, new_eip);
1994 POPL(ssp, sp, sp_mask, new_cs);
1995 new_cs &= 0xffff;
1996 if (is_iret) {
1997 POPL(ssp, sp, sp_mask, new_eflags);
1998 if (new_eflags & VM_MASK) {
1999 goto return_to_vm86;
2000 }
2001 }
2002 } else {
2003 /* 16 bits */
2004 POPW(ssp, sp, sp_mask, new_eip);
2005 POPW(ssp, sp, sp_mask, new_cs);
2006 if (is_iret) {
2007 POPW(ssp, sp, sp_mask, new_eflags);
2008 }
eaa728ee 2009 }
eaa728ee 2010 }
d12d51d5
AL		 2011 LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n",
2012 new_cs, new_eip, shift, addend);
2013 LOG_PCALL_STATE(env);
20054ef0 2014 if ((new_cs & 0xfffc) == 0) {
77b2bc2c 2015 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2016 }
2999a0b2 2017 if (load_segment(env, &e1, &e2, new_cs) != 0) {
77b2bc2c 2018 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2019 }
eaa728ee 2020 if (!(e2 & DESC_S_MASK) ||
20054ef0 2021 !(e2 & DESC_CS_MASK)) {
77b2bc2c 2022 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2023 }
eaa728ee
FB		 2024 cpl = env->hflags & HF_CPL_MASK;
2025 rpl = new_cs & 3;
20054ef0 2026 if (rpl < cpl) {
77b2bc2c 2027 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2028 }
eaa728ee
FB		 2029 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2030 if (e2 & DESC_C_MASK) {
20054ef0 2031 if (dpl > rpl) {
77b2bc2c 2032 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2033 }
eaa728ee 2034 } else {
20054ef0 2035 if (dpl != rpl) {
77b2bc2c 2036 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
20054ef0 2037 }
eaa728ee 2038 }
20054ef0 2039 if (!(e2 & DESC_P_MASK)) {
77b2bc2c 2040 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
20054ef0 2041 }
eaa728ee
FB		 2042
2043 sp += addend;
2044 if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) ||
2045 ((env->hflags & HF_CS64_MASK) && !is_iret))) {
1235fc06 2046 /* return to same privilege level */
eaa728ee
FB		 2047 cpu_x86_load_seg_cache(env, R_CS, new_cs,
2048 get_seg_base(e1, e2),
2049 get_seg_limit(e1, e2),
2050 e2);
2051 } else {
2052 /* return to different privilege level */
2053#ifdef TARGET_X86_64
2054 if (shift == 2) {
2055 POPQ(sp, new_esp);
2056 POPQ(sp, new_ss);
2057 new_ss &= 0xffff;
2058 } else
2059#endif
20054ef0
BS		 2060 {
2061 if (shift == 1) {
2062 /* 32 bits */
2063 POPL(ssp, sp, sp_mask, new_esp);
2064 POPL(ssp, sp, sp_mask, new_ss);
2065 new_ss &= 0xffff;
2066 } else {
2067 /* 16 bits */
2068 POPW(ssp, sp, sp_mask, new_esp);
2069 POPW(ssp, sp, sp_mask, new_ss);
2070 }
eaa728ee 2071 }
d12d51d5 2072 LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n",
20054ef0 2073 new_ss, new_esp);
eaa728ee
FB		 2074 if ((new_ss & 0xfffc) == 0) {
2075#ifdef TARGET_X86_64
20054ef0
BS		 2076 /* NULL ss is allowed in long mode if cpl != 3 */
2077 /* XXX: test CS64? */
eaa728ee
FB		 2078 if ((env->hflags & HF_LMA_MASK) && rpl != 3) {
2079 cpu_x86_load_seg_cache(env, R_SS, new_ss,
2080 0, 0xffffffff,
2081 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2082 DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
2083 DESC_W_MASK | DESC_A_MASK);
20054ef0 2084 ss_e2 = DESC_B_MASK; /* XXX: should not be needed? */
eaa728ee
FB		 2085 } else
2086#endif
2087 {
77b2bc2c 2088 raise_exception_err(env, EXCP0D_GPF, 0);
eaa728ee
FB		 2089 }
2090 } else {
20054ef0 2091 if ((new_ss & 3) != rpl) {
77b2bc2c 2092 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
20054ef0 2093 }
2999a0b2 2094 if (load_segment(env, &ss_e1, &ss_e2, new_ss) != 0) {
77b2bc2c 2095 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
20054ef0 2096 }
eaa728ee
FB		 2097 if (!(ss_e2 & DESC_S_MASK) ||
2098 (ss_e2 & DESC_CS_MASK) ||
20054ef0 2099 !(ss_e2 & DESC_W_MASK)) {
77b2bc2c 2100 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
20054ef0 2101 }
eaa728ee 2102 dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
20054ef0 2103 if (dpl != rpl) {
77b2bc2c 2104 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
20054ef0
BS		 2105 }
2106 if (!(ss_e2 & DESC_P_MASK)) {
77b2bc2c 2107 raise_exception_err(env, EXCP0B_NOSEG, new_ss & 0xfffc);
20054ef0 2108 }
eaa728ee
FB		 2109 cpu_x86_load_seg_cache(env, R_SS, new_ss,
2110 get_seg_base(ss_e1, ss_e2),
2111 get_seg_limit(ss_e1, ss_e2),
2112 ss_e2);
2113 }
2114
2115 cpu_x86_load_seg_cache(env, R_CS, new_cs,
2116 get_seg_base(e1, e2),
2117 get_seg_limit(e1, e2),
2118 e2);
2119 cpu_x86_set_cpl(env, rpl);
2120 sp = new_esp;
2121#ifdef TARGET_X86_64
20054ef0 2122 if (env->hflags & HF_CS64_MASK) {
eaa728ee 2123 sp_mask = -1;
20054ef0 2124 } else
eaa728ee 2125#endif
20054ef0 2126 {
eaa728ee 2127 sp_mask = get_sp_mask(ss_e2);
20054ef0 2128 }
eaa728ee
FB		 2129
2130 /* validate data segments */
2999a0b2
BS		 2131 validate_seg(env, R_ES, rpl);
2132 validate_seg(env, R_DS, rpl);
2133 validate_seg(env, R_FS, rpl);
2134 validate_seg(env, R_GS, rpl);
eaa728ee
FB		 2135
2136 sp += addend;
2137 }
2138 SET_ESP(sp, sp_mask);
2139 env->eip = new_eip;
2140 if (is_iret) {
2141 /* NOTE: 'cpl' is the _old_ CPL */
2142 eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK;
20054ef0 2143 if (cpl == 0) {
eaa728ee 2144 eflags_mask |= IOPL_MASK;
20054ef0 2145 }
eaa728ee 2146 iopl = (env->eflags >> IOPL_SHIFT) & 3;
20054ef0 2147 if (cpl <= iopl) {
eaa728ee 2148 eflags_mask |= IF_MASK;
20054ef0
BS		 2149 }
2150 if (shift == 0) {
eaa728ee 2151 eflags_mask &= 0xffff;
20054ef0 2152 }
997ff0d9 2153 cpu_load_eflags(env, new_eflags, eflags_mask);
eaa728ee
FB		 2154 }
2155 return;
2156
2157 return_to_vm86:
2158 POPL(ssp, sp, sp_mask, new_esp);
2159 POPL(ssp, sp, sp_mask, new_ss);
2160 POPL(ssp, sp, sp_mask, new_es);
2161 POPL(ssp, sp, sp_mask, new_ds);
2162 POPL(ssp, sp, sp_mask, new_fs);
2163 POPL(ssp, sp, sp_mask, new_gs);
2164
2165 /* modify processor state */
997ff0d9
BS		 2166 cpu_load_eflags(env, new_eflags, TF_MASK | AC_MASK | ID_MASK |
2167 IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK |
2168 VIP_MASK);
2999a0b2 2169 load_seg_vm(env, R_CS, new_cs & 0xffff);
eaa728ee 2170 cpu_x86_set_cpl(env, 3);
2999a0b2
BS		 2171 load_seg_vm(env, R_SS, new_ss & 0xffff);
2172 load_seg_vm(env, R_ES, new_es & 0xffff);
2173 load_seg_vm(env, R_DS, new_ds & 0xffff);
2174 load_seg_vm(env, R_FS, new_fs & 0xffff);
2175 load_seg_vm(env, R_GS, new_gs & 0xffff);
eaa728ee
FB		 2176
2177 env->eip = new_eip & 0xffff;
2178 ESP = new_esp;
2179}
2180
2999a0b2 2181void helper_iret_protected(CPUX86State *env, int shift, int next_eip)
eaa728ee
FB		 2182{
2183 int tss_selector, type;
2184 uint32_t e1, e2;
2185
2186 /* specific case for TSS */
2187 if (env->eflags & NT_MASK) {
2188#ifdef TARGET_X86_64
20054ef0 2189 if (env->hflags & HF_LMA_MASK) {
77b2bc2c 2190 raise_exception_err(env, EXCP0D_GPF, 0);
20054ef0 2191 }
eaa728ee 2192#endif
329e607d 2193 tss_selector = cpu_lduw_kernel(env, env->tr.base + 0);
20054ef0 2194 if (tss_selector & 4) {
77b2bc2c 2195 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
20054ef0 2196 }
2999a0b2 2197 if (load_segment(env, &e1, &e2, tss_selector) != 0) {
77b2bc2c 2198 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
20054ef0 2199 }
eaa728ee
FB		 2200 type = (e2 >> DESC_TYPE_SHIFT) & 0x17;
2201 /* NOTE: we check both segment and busy TSS */
20054ef0 2202 if (type != 3) {
77b2bc2c 2203 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
20054ef0 2204 }
2999a0b2 2205 switch_tss(env, tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip);
eaa728ee 2206 } else {
2999a0b2 2207 helper_ret_protected(env, shift, 1, 0);
eaa728ee 2208 }
db620f46 2209 env->hflags2 &= ~HF2_NMI_MASK;
eaa728ee
FB		 2210}
2211
2999a0b2 2212void helper_lret_protected(CPUX86State *env, int shift, int addend)
eaa728ee 2213{
2999a0b2 2214 helper_ret_protected(env, shift, 0, addend);
eaa728ee
FB		 2215}
2216
2999a0b2 2217void helper_sysenter(CPUX86State *env)
eaa728ee
FB		 2218{
2219 if (env->sysenter_cs == 0) {
77b2bc2c 2220 raise_exception_err(env, EXCP0D_GPF, 0);
eaa728ee
FB		 2221 }
2222 env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK);
2223 cpu_x86_set_cpl(env, 0);
2436b61a
AZ		 2224
2225#ifdef TARGET_X86_64
2226 if (env->hflags & HF_LMA_MASK) {
2227 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
2228 0, 0xffffffff,
2229 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2230 DESC_S_MASK |
20054ef0
BS		 2231 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
2232 DESC_L_MASK);
2436b61a
AZ		 2233 } else
2234#endif
2235 {
2236 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
2237 0, 0xffffffff,
2238 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2239 DESC_S_MASK |
2240 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
2241 }
eaa728ee
FB		 2242 cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc,
2243 0, 0xffffffff,
2244 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2245 DESC_S_MASK |
2246 DESC_W_MASK | DESC_A_MASK);
2247 ESP = env->sysenter_esp;
2248 EIP = env->sysenter_eip;
2249}
2250
2999a0b2 2251void helper_sysexit(CPUX86State *env, int dflag)
eaa728ee
FB		 2252{
2253 int cpl;
2254
2255 cpl = env->hflags & HF_CPL_MASK;
2256 if (env->sysenter_cs == 0 || cpl != 0) {
77b2bc2c 2257 raise_exception_err(env, EXCP0D_GPF, 0);
eaa728ee
FB		 2258 }
2259 cpu_x86_set_cpl(env, 3);
2436b61a
AZ		 2260#ifdef TARGET_X86_64
2261 if (dflag == 2) {
20054ef0
BS		 2262 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) |
2263 3, 0, 0xffffffff,
2436b61a
AZ		 2264 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2265 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
20054ef0
BS		 2266 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
2267 DESC_L_MASK);
2268 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) |
2269 3, 0, 0xffffffff,
2436b61a
AZ		 2270 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2271 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2272 DESC_W_MASK | DESC_A_MASK);
2273 } else
2274#endif
2275 {
20054ef0
BS		 2276 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) |
2277 3, 0, 0xffffffff,
2436b61a
AZ		 2278 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2279 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2280 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
20054ef0
BS		 2281 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) |
2282 3, 0, 0xffffffff,
2436b61a
AZ		 2283 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2284 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2285 DESC_W_MASK | DESC_A_MASK);
2286 }
eaa728ee
FB		 2287 ESP = ECX;
2288 EIP = EDX;
eaa728ee
FB		 2289}
2290
2999a0b2 2291target_ulong helper_lsl(CPUX86State *env, target_ulong selector1)
eaa728ee
FB		 2292{
2293 unsigned int limit;
2294 uint32_t e1, e2, eflags, selector;
2295 int rpl, dpl, cpl, type;
2296
2297 selector = selector1 & 0xffff;
f0967a1a 2298 eflags = cpu_cc_compute_all(env, CC_OP);
20054ef0 2299 if ((selector & 0xfffc) == 0) {
dc1ded53 2300 goto fail;
20054ef0 2301 }
2999a0b2 2302 if (load_segment(env, &e1, &e2, selector) != 0) {
eaa728ee 2303 goto fail;
20054ef0 2304 }
eaa728ee
FB		 2305 rpl = selector & 3;
2306 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2307 cpl = env->hflags & HF_CPL_MASK;
2308 if (e2 & DESC_S_MASK) {
2309 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
2310 /* conforming */
2311 } else {
20054ef0 2312 if (dpl < cpl || dpl < rpl) {
eaa728ee 2313 goto fail;
20054ef0 2314 }
eaa728ee
FB		 2315 }
2316 } else {
2317 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 2318 switch (type) {
eaa728ee
FB		 2319 case 1:
2320 case 2:
2321 case 3:
2322 case 9:
2323 case 11:
2324 break;
2325 default:
2326 goto fail;
2327 }
2328 if (dpl < cpl || dpl < rpl) {
2329 fail:
2330 CC_SRC = eflags & ~CC_Z;
2331 return 0;
2332 }
2333 }
2334 limit = get_seg_limit(e1, e2);
2335 CC_SRC = eflags | CC_Z;
2336 return limit;
2337}
2338
2999a0b2 2339target_ulong helper_lar(CPUX86State *env, target_ulong selector1)
eaa728ee
FB		 2340{
2341 uint32_t e1, e2, eflags, selector;
2342 int rpl, dpl, cpl, type;
2343
2344 selector = selector1 & 0xffff;
f0967a1a 2345 eflags = cpu_cc_compute_all(env, CC_OP);
20054ef0 2346 if ((selector & 0xfffc) == 0) {
eaa728ee 2347 goto fail;
20054ef0 2348 }
2999a0b2 2349 if (load_segment(env, &e1, &e2, selector) != 0) {
eaa728ee 2350 goto fail;
20054ef0 2351 }
eaa728ee
FB		 2352 rpl = selector & 3;
2353 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2354 cpl = env->hflags & HF_CPL_MASK;
2355 if (e2 & DESC_S_MASK) {
2356 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
2357 /* conforming */
2358 } else {
20054ef0 2359 if (dpl < cpl || dpl < rpl) {
eaa728ee 2360 goto fail;
20054ef0 2361 }
eaa728ee
FB		 2362 }
2363 } else {
2364 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
20054ef0 2365 switch (type) {
eaa728ee
FB		 2366 case 1:
2367 case 2:
2368 case 3:
2369 case 4:
2370 case 5:
2371 case 9:
2372 case 11:
2373 case 12:
2374 break;
2375 default:
2376 goto fail;
2377 }
2378 if (dpl < cpl || dpl < rpl) {
2379 fail:
2380 CC_SRC = eflags & ~CC_Z;
2381 return 0;
2382 }
2383 }
2384 CC_SRC = eflags | CC_Z;
2385 return e2 & 0x00f0ff00;
2386}
2387
2999a0b2 2388void helper_verr(CPUX86State *env, target_ulong selector1)
eaa728ee
FB		 2389{
2390 uint32_t e1, e2, eflags, selector;
2391 int rpl, dpl, cpl;
2392
2393 selector = selector1 & 0xffff;
f0967a1a 2394 eflags = cpu_cc_compute_all(env, CC_OP);
20054ef0 2395 if ((selector & 0xfffc) == 0) {
eaa728ee 2396 goto fail;
20054ef0 2397 }
2999a0b2 2398 if (load_segment(env, &e1, &e2, selector) != 0) {
eaa728ee 2399 goto fail;
20054ef0
BS		 2400 }
2401 if (!(e2 & DESC_S_MASK)) {
eaa728ee 2402 goto fail;
20054ef0 2403 }
eaa728ee
FB		 2404 rpl = selector & 3;
2405 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2406 cpl = env->hflags & HF_CPL_MASK;
2407 if (e2 & DESC_CS_MASK) {
20054ef0 2408 if (!(e2 & DESC_R_MASK)) {
eaa728ee 2409 goto fail;
20054ef0 2410 }
eaa728ee 2411 if (!(e2 & DESC_C_MASK)) {
20054ef0 2412 if (dpl < cpl || dpl < rpl) {
eaa728ee 2413 goto fail;
20054ef0 2414 }
eaa728ee
FB		 2415 }
2416 } else {
2417 if (dpl < cpl || dpl < rpl) {
2418 fail:
2419 CC_SRC = eflags & ~CC_Z;
2420 return;
2421 }
2422 }
2423 CC_SRC = eflags | CC_Z;
2424}
2425
2999a0b2 2426void helper_verw(CPUX86State *env, target_ulong selector1)
eaa728ee
FB		 2427{
2428 uint32_t e1, e2, eflags, selector;
2429 int rpl, dpl, cpl;
2430
2431 selector = selector1 & 0xffff;
f0967a1a 2432 eflags = cpu_cc_compute_all(env, CC_OP);
20054ef0 2433 if ((selector & 0xfffc) == 0) {
eaa728ee 2434 goto fail;
20054ef0 2435 }
2999a0b2 2436 if (load_segment(env, &e1, &e2, selector) != 0) {
eaa728ee 2437 goto fail;
20054ef0
BS		 2438 }
2439 if (!(e2 & DESC_S_MASK)) {
eaa728ee 2440 goto fail;
20054ef0 2441 }
eaa728ee
FB		 2442 rpl = selector & 3;
2443 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2444 cpl = env->hflags & HF_CPL_MASK;
2445 if (e2 & DESC_CS_MASK) {
2446 goto fail;
2447 } else {
20054ef0 2448 if (dpl < cpl || dpl < rpl) {
eaa728ee 2449 goto fail;
20054ef0 2450 }
eaa728ee
FB		 2451 if (!(e2 & DESC_W_MASK)) {
2452 fail:
2453 CC_SRC = eflags & ~CC_Z;
2454 return;
2455 }
2456 }
2457 CC_SRC = eflags | CC_Z;
2458}
2459
f299f437 2460#if defined(CONFIG_USER_ONLY)
2999a0b2 2461void cpu_x86_load_seg(CPUX86State *env, int seg_reg, int selector)
eaa728ee 2462{
f299f437
BS		 2463 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
2464 selector &= 0xffff;
2465 cpu_x86_load_seg_cache(env, seg_reg, selector,
2466 (selector << 4), 0xffff, 0);
2467 } else {
2999a0b2 2468 helper_load_seg(env, seg_reg, selector);
13822781 2469 }
eaa728ee 2470}
eaa728ee 2471#endif
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