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Fix lan9118 buffer length handling
[qemu.git] / target-i386 / seg_helper.c
blobe78910200adb5f0cd9cb755326dcd7e96bcc4614
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 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 "cpu.h"
22 #include "qemu/log.h"
23 #include "helper.h"
24
25 //#define DEBUG_PCALL
26
27 #if !defined(CONFIG_USER_ONLY)
28 #include "exec/softmmu_exec.h"
29 #endif /* !defined(CONFIG_USER_ONLY) */
30
31 #ifdef DEBUG_PCALL
32 # define LOG_PCALL(...) qemu_log_mask(CPU_LOG_PCALL, ## __VA_ARGS__)
33 # define LOG_PCALL_STATE(cpu) \
34 log_cpu_state_mask(CPU_LOG_PCALL, (cpu), CPU_DUMP_CCOP)
35 #else
36 # define LOG_PCALL(...) do { } while (0)
37 # define LOG_PCALL_STATE(cpu) do { } while (0)
38 #endif
39
40 /* return non zero if error */
41 static inline int load_segment(CPUX86State *env, uint32_t *e1_ptr,
42 uint32_t *e2_ptr, int selector)
43 {
44 SegmentCache *dt;
45 int index;
46 target_ulong ptr;
47
48 if (selector & 0x4) {
49 dt = &env->ldt;
50 } else {
51 dt = &env->gdt;
52 }
53 index = selector & ~7;
54 if ((index + 7) > dt->limit) {
55 return -1;
56 }
57 ptr = dt->base + index;
58 *e1_ptr = cpu_ldl_kernel(env, ptr);
59 *e2_ptr = cpu_ldl_kernel(env, ptr + 4);
60 return 0;
61 }
62
63 static inline unsigned int get_seg_limit(uint32_t e1, uint32_t e2)
64 {
65 unsigned int limit;
66
67 limit = (e1 & 0xffff) | (e2 & 0x000f0000);
68 if (e2 & DESC_G_MASK) {
69 limit = (limit << 12) | 0xfff;
70 }
71 return limit;
72 }
73
74 static inline uint32_t get_seg_base(uint32_t e1, uint32_t e2)
75 {
76 return (e1 >> 16) | ((e2 & 0xff) << 16) | (e2 & 0xff000000);
77 }
78
79 static inline void load_seg_cache_raw_dt(SegmentCache *sc, uint32_t e1,
80 uint32_t e2)
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. */
88 static inline void load_seg_vm(CPUX86State *env, int seg, int selector)
89 {
90 selector &= 0xffff;
91 cpu_x86_load_seg_cache(env, seg, selector,
92 (selector << 4), 0xffff, 0);
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 {
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);
104 for (i = 0; i < env->tr.limit; i++) {
105 printf("%02x ", env->tr.base[i]);
106 if ((i & 7) == 7) {
107 printf("\n");
108 }
109 }
110 printf("\n");
111 }
112 #endif
113
114 if (!(env->tr.flags & DESC_P_MASK)) {
115 cpu_abort(env, "invalid tss");
116 }
117 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
118 if ((type & 7) != 1) {
119 cpu_abort(env, "invalid tss type");
120 }
121 shift = type >> 3;
122 index = (dpl * 4 + 2) << shift;
123 if (index + (4 << shift) - 1 > env->tr.limit) {
124 raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
125 }
126 if (shift == 0) {
127 *esp_ptr = cpu_lduw_kernel(env, env->tr.base + index);
128 *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 2);
129 } else {
130 *esp_ptr = cpu_ldl_kernel(env, env->tr.base + index);
131 *ss_ptr = cpu_lduw_kernel(env, env->tr.base + index + 4);
132 }
133 }
134
135 /* XXX: merge with load_seg() */
136 static void tss_load_seg(CPUX86State *env, int seg_reg, int selector)
137 {
138 uint32_t e1, e2;
139 int rpl, dpl, cpl;
140
141 if ((selector & 0xfffc) != 0) {
142 if (load_segment(env, &e1, &e2, selector) != 0) {
143 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
144 }
145 if (!(e2 & DESC_S_MASK)) {
146 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
147 }
148 rpl = selector & 3;
149 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
150 cpl = env->hflags & HF_CPL_MASK;
151 if (seg_reg == R_CS) {
152 if (!(e2 & DESC_CS_MASK)) {
153 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
154 }
155 /* XXX: is it correct? */
156 if (dpl != rpl) {
157 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
158 }
159 if ((e2 & DESC_C_MASK) && dpl > rpl) {
160 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
161 }
162 } else if (seg_reg == R_SS) {
163 /* SS must be writable data */
164 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
165 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
166 }
167 if (dpl != cpl || dpl != rpl) {
168 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
169 }
170 } else {
171 /* not readable code */
172 if ((e2 & DESC_CS_MASK) && !(e2 & DESC_R_MASK)) {
173 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
174 }
175 /* if data or non conforming code, checks the rights */
176 if (((e2 >> DESC_TYPE_SHIFT) & 0xf) < 12) {
177 if (dpl < cpl || dpl < rpl) {
178 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
179 }
180 }
181 }
182 if (!(e2 & DESC_P_MASK)) {
183 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
184 }
185 cpu_x86_load_seg_cache(env, seg_reg, selector,
186 get_seg_base(e1, e2),
187 get_seg_limit(e1, e2),
188 e2);
189 } else {
190 if (seg_reg == R_SS || seg_reg == R_CS) {
191 raise_exception_err(env, EXCP0A_TSS, selector & 0xfffc);
192 }
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) */
201 static void switch_tss(CPUX86State *env, int tss_selector,
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;
215 LOG_PCALL("switch_tss: sel=0x%04x type=%d src=%d\n", tss_selector, type,
216 source);
217
218 /* if task gate, we read the TSS segment and we load it */
219 if (type == 5) {
220 if (!(e2 & DESC_P_MASK)) {
221 raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
222 }
223 tss_selector = e1 >> 16;
224 if (tss_selector & 4) {
225 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
226 }
227 if (load_segment(env, &e1, &e2, tss_selector) != 0) {
228 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
229 }
230 if (e2 & DESC_S_MASK) {
231 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
232 }
233 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
234 if ((type & 7) != 1) {
235 raise_exception_err(env, EXCP0D_GPF, tss_selector & 0xfffc);
236 }
237 }
238
239 if (!(e2 & DESC_P_MASK)) {
240 raise_exception_err(env, EXCP0B_NOSEG, tss_selector & 0xfffc);
241 }
242
243 if (type & 8) {
244 tss_limit_max = 103;
245 } else {
246 tss_limit_max = 43;
247 }
248 tss_limit = get_seg_limit(e1, e2);
249 tss_base = get_seg_base(e1, e2);
250 if ((tss_selector & 4) != 0 ||
251 tss_limit < tss_limit_max) {
252 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
253 }
254 old_type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
255 if (old_type & 8) {
256 old_tss_limit_max = 103;
257 } else {
258 old_tss_limit_max = 43;
259 }
260
261 /* read all the registers from the new TSS */
262 if (type & 8) {
263 /* 32 bit */
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);
267 for (i = 0; i < 8; i++) {
268 new_regs[i] = cpu_ldl_kernel(env, tss_base + (0x28 + i * 4));
269 }
270 for (i = 0; i < 6; i++) {
271 new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x48 + i * 4));
272 }
273 new_ldt = cpu_lduw_kernel(env, tss_base + 0x60);
274 new_trap = cpu_ldl_kernel(env, tss_base + 0x64);
275 } else {
276 /* 16 bit */
277 new_cr3 = 0;
278 new_eip = cpu_lduw_kernel(env, tss_base + 0x0e);
279 new_eflags = cpu_lduw_kernel(env, tss_base + 0x10);
280 for (i = 0; i < 8; i++) {
281 new_regs[i] = cpu_lduw_kernel(env, tss_base + (0x12 + i * 2)) |
282 0xffff0000;
283 }
284 for (i = 0; i < 4; i++) {
285 new_segs[i] = cpu_lduw_kernel(env, tss_base + (0x22 + i * 4));
286 }
287 new_ldt = cpu_lduw_kernel(env, tss_base + 0x2a);
288 new_segs[R_FS] = 0;
289 new_segs[R_GS] = 0;
290 new_trap = 0;
291 }
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;
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
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);
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;
311
312 ptr = env->gdt.base + (env->tr.selector & ~7);
313 e2 = cpu_ldl_kernel(env, ptr + 4);
314 e2 &= ~DESC_TSS_BUSY_MASK;
315 cpu_stl_kernel(env, ptr + 4, e2);
316 }
317 old_eflags = cpu_compute_eflags(env);
318 if (source == SWITCH_TSS_IRET) {
319 old_eflags &= ~NT_MASK;
320 }
321
322 /* save the current state in the old TSS */
323 if (type & 8) {
324 /* 32 bit */
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), env->regs[R_EAX]);
328 cpu_stl_kernel(env, env->tr.base + (0x28 + 1 * 4), env->regs[R_ECX]);
329 cpu_stl_kernel(env, env->tr.base + (0x28 + 2 * 4), env->regs[R_EDX]);
330 cpu_stl_kernel(env, env->tr.base + (0x28 + 3 * 4), env->regs[R_EBX]);
331 cpu_stl_kernel(env, env->tr.base + (0x28 + 4 * 4), env->regs[R_ESP]);
332 cpu_stl_kernel(env, env->tr.base + (0x28 + 5 * 4), env->regs[R_EBP]);
333 cpu_stl_kernel(env, env->tr.base + (0x28 + 6 * 4), env->regs[R_ESI]);
334 cpu_stl_kernel(env, env->tr.base + (0x28 + 7 * 4), env->regs[R_EDI]);
335 for (i = 0; i < 6; i++) {
336 cpu_stw_kernel(env, env->tr.base + (0x48 + i * 4),
337 env->segs[i].selector);
338 }
339 } else {
340 /* 16 bit */
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), env->regs[R_EAX]);
344 cpu_stw_kernel(env, env->tr.base + (0x12 + 1 * 2), env->regs[R_ECX]);
345 cpu_stw_kernel(env, env->tr.base + (0x12 + 2 * 2), env->regs[R_EDX]);
346 cpu_stw_kernel(env, env->tr.base + (0x12 + 3 * 2), env->regs[R_EBX]);
347 cpu_stw_kernel(env, env->tr.base + (0x12 + 4 * 2), env->regs[R_ESP]);
348 cpu_stw_kernel(env, env->tr.base + (0x12 + 5 * 2), env->regs[R_EBP]);
349 cpu_stw_kernel(env, env->tr.base + (0x12 + 6 * 2), env->regs[R_ESI]);
350 cpu_stw_kernel(env, env->tr.base + (0x12 + 7 * 2), env->regs[R_EDI]);
351 for (i = 0; i < 4; i++) {
352 cpu_stw_kernel(env, env->tr.base + (0x22 + i * 4),
353 env->segs[i].selector);
354 }
355 }
356
357 /* now if an exception occurs, it will occurs in the next task
358 context */
359
360 if (source == SWITCH_TSS_CALL) {
361 cpu_stw_kernel(env, tss_base, env->tr.selector);
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;
369
370 ptr = env->gdt.base + (tss_selector & ~7);
371 e2 = cpu_ldl_kernel(env, ptr + 4);
372 e2 |= DESC_TSS_BUSY_MASK;
373 cpu_stl_kernel(env, ptr + 4, e2);
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;
394 if (!(type & 8)) {
395 eflags_mask &= 0xffff;
396 }
397 cpu_load_eflags(env, new_eflags, eflags_mask);
398 /* XXX: what to do in 16 bit case? */
399 env->regs[R_EAX] = new_regs[0];
400 env->regs[R_ECX] = new_regs[1];
401 env->regs[R_EDX] = new_regs[2];
402 env->regs[R_EBX] = new_regs[3];
403 env->regs[R_ESP] = new_regs[4];
404 env->regs[R_EBP] = new_regs[5];
405 env->regs[R_ESI] = new_regs[6];
406 env->regs[R_EDI] = new_regs[7];
407 if (new_eflags & VM_MASK) {
408 for (i = 0; i < 6; i++) {
409 load_seg_vm(env, i, new_segs[i]);
410 }
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 */
417 for (i = 0; i < 6; i++) {
418 cpu_x86_load_seg_cache(env, i, new_segs[i], 0, 0, 0);
419 }
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 */
428 if (new_ldt & 4) {
429 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
430 }
431
432 if ((new_ldt & 0xfffc) != 0) {
433 dt = &env->gdt;
434 index = new_ldt & ~7;
435 if ((index + 7) > dt->limit) {
436 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
437 }
438 ptr = dt->base + index;
439 e1 = cpu_ldl_kernel(env, ptr);
440 e2 = cpu_ldl_kernel(env, ptr + 4);
441 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
442 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
443 }
444 if (!(e2 & DESC_P_MASK)) {
445 raise_exception_err(env, EXCP0A_TSS, new_ldt & 0xfffc);
446 }
447 load_seg_cache_raw_dt(&env->ldt, e1, e2);
448 }
449
450 /* load the segments */
451 if (!(new_eflags & VM_MASK)) {
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]);
458 }
459
460 /* check that env->eip is in the CS segment limits */
461 if (new_eip > env->segs[R_CS].limit) {
462 /* XXX: different exception if CALL? */
463 raise_exception_err(env, EXCP0D_GPF, 0);
464 }
465
466 #ifndef CONFIG_USER_ONLY
467 /* reset local breakpoints */
468 if (env->dr[7] & DR7_LOCAL_BP_MASK) {
469 for (i = 0; i < DR7_MAX_BP; i++) {
470 if (hw_local_breakpoint_enabled(env->dr[7], i) &&
471 !hw_global_breakpoint_enabled(env->dr[7], i)) {
472 hw_breakpoint_remove(env, i);
473 }
474 }
475 env->dr[7] &= ~DR7_LOCAL_BP_MASK;
476 }
477 #endif
478 }
479
480 static inline unsigned int get_sp_mask(unsigned int e2)
481 {
482 if (e2 & DESC_B_MASK) {
483 return 0xffffffff;
484 } else {
485 return 0xffff;
486 }
487 }
488
489 static 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(ssp, sp, sp_mask, val) \
530 { \
531 sp -= 2; \
532 cpu_stw_kernel(env, (ssp) + (sp & (sp_mask)), (val)); \
533 }
534
535 #define PUSHL(ssp, sp, sp_mask, val) \
536 { \
537 sp -= 4; \
538 cpu_stl_kernel(env, SEG_ADDL(ssp, sp, sp_mask), (uint32_t)(val)); \
539 }
540
541 #define POPW(ssp, sp, sp_mask, val) \
542 { \
543 val = cpu_lduw_kernel(env, (ssp) + (sp & (sp_mask))); \
544 sp += 2; \
545 }
546
547 #define POPL(ssp, sp, sp_mask, val) \
548 { \
549 val = (uint32_t)cpu_ldl_kernel(env, SEG_ADDL(ssp, sp, sp_mask)); \
550 sp += 4; \
551 }
552
553 /* protected mode interrupt */
554 static void do_interrupt_protected(CPUX86State *env, int intno, int is_int,
555 int error_code, unsigned int next_eip,
556 int is_hw)
557 {
558 SegmentCache *dt;
559 target_ulong ptr, ssp;
560 int type, dpl, selector, ss_dpl, cpl;
561 int has_error_code, new_stack, shift;
562 uint32_t e1, e2, offset, ss = 0, esp, ss_e1 = 0, ss_e2 = 0;
563 uint32_t old_eip, sp_mask;
564
565 has_error_code = 0;
566 if (!is_int && !is_hw) {
567 has_error_code = exception_has_error_code(intno);
568 }
569 if (is_int) {
570 old_eip = next_eip;
571 } else {
572 old_eip = env->eip;
573 }
574
575 dt = &env->idt;
576 if (intno * 8 + 7 > dt->limit) {
577 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
578 }
579 ptr = dt->base + intno * 8;
580 e1 = cpu_ldl_kernel(env, ptr);
581 e2 = cpu_ldl_kernel(env, ptr + 4);
582 /* check gate type */
583 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
584 switch (type) {
585 case 5: /* task gate */
586 /* must do that check here to return the correct error code */
587 if (!(e2 & DESC_P_MASK)) {
588 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
589 }
590 switch_tss(env, intno * 8, e1, e2, SWITCH_TSS_CALL, old_eip);
591 if (has_error_code) {
592 int type;
593 uint32_t mask;
594
595 /* push the error code */
596 type = (env->tr.flags >> DESC_TYPE_SHIFT) & 0xf;
597 shift = type >> 3;
598 if (env->segs[R_SS].flags & DESC_B_MASK) {
599 mask = 0xffffffff;
600 } else {
601 mask = 0xffff;
602 }
603 esp = (env->regs[R_ESP] - (2 << shift)) & mask;
604 ssp = env->segs[R_SS].base + esp;
605 if (shift) {
606 cpu_stl_kernel(env, ssp, error_code);
607 } else {
608 cpu_stw_kernel(env, ssp, error_code);
609 }
610 SET_ESP(esp, mask);
611 }
612 return;
613 case 6: /* 286 interrupt gate */
614 case 7: /* 286 trap gate */
615 case 14: /* 386 interrupt gate */
616 case 15: /* 386 trap gate */
617 break;
618 default:
619 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
620 break;
621 }
622 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
623 cpl = env->hflags & HF_CPL_MASK;
624 /* check privilege if software int */
625 if (is_int && dpl < cpl) {
626 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
627 }
628 /* check valid bit */
629 if (!(e2 & DESC_P_MASK)) {
630 raise_exception_err(env, EXCP0B_NOSEG, intno * 8 + 2);
631 }
632 selector = e1 >> 16;
633 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
634 if ((selector & 0xfffc) == 0) {
635 raise_exception_err(env, EXCP0D_GPF, 0);
636 }
637 if (load_segment(env, &e1, &e2, selector) != 0) {
638 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
639 }
640 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
641 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
642 }
643 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
644 if (dpl > cpl) {
645 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
646 }
647 if (!(e2 & DESC_P_MASK)) {
648 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
649 }
650 if (!(e2 & DESC_C_MASK) && dpl < cpl) {
651 /* to inner privilege */
652 get_ss_esp_from_tss(env, &ss, &esp, dpl);
653 if ((ss & 0xfffc) == 0) {
654 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
655 }
656 if ((ss & 3) != dpl) {
657 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
658 }
659 if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
660 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
661 }
662 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
663 if (ss_dpl != dpl) {
664 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
665 }
666 if (!(ss_e2 & DESC_S_MASK) ||
667 (ss_e2 & DESC_CS_MASK) ||
668 !(ss_e2 & DESC_W_MASK)) {
669 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
670 }
671 if (!(ss_e2 & DESC_P_MASK)) {
672 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
673 }
674 new_stack = 1;
675 sp_mask = get_sp_mask(ss_e2);
676 ssp = get_seg_base(ss_e1, ss_e2);
677 } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
678 /* to same privilege */
679 if (env->eflags & VM_MASK) {
680 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
681 }
682 new_stack = 0;
683 sp_mask = get_sp_mask(env->segs[R_SS].flags);
684 ssp = env->segs[R_SS].base;
685 esp = env->regs[R_ESP];
686 dpl = cpl;
687 } else {
688 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
689 new_stack = 0; /* avoid warning */
690 sp_mask = 0; /* avoid warning */
691 ssp = 0; /* avoid warning */
692 esp = 0; /* avoid warning */
693 }
694
695 shift = type >> 3;
696
697 #if 0
698 /* XXX: check that enough room is available */
699 push_size = 6 + (new_stack << 2) + (has_error_code << 1);
700 if (env->eflags & VM_MASK) {
701 push_size += 8;
702 }
703 push_size <<= shift;
704 #endif
705 if (shift == 1) {
706 if (new_stack) {
707 if (env->eflags & VM_MASK) {
708 PUSHL(ssp, esp, sp_mask, env->segs[R_GS].selector);
709 PUSHL(ssp, esp, sp_mask, env->segs[R_FS].selector);
710 PUSHL(ssp, esp, sp_mask, env->segs[R_DS].selector);
711 PUSHL(ssp, esp, sp_mask, env->segs[R_ES].selector);
712 }
713 PUSHL(ssp, esp, sp_mask, env->segs[R_SS].selector);
714 PUSHL(ssp, esp, sp_mask, env->regs[R_ESP]);
715 }
716 PUSHL(ssp, esp, sp_mask, cpu_compute_eflags(env));
717 PUSHL(ssp, esp, sp_mask, env->segs[R_CS].selector);
718 PUSHL(ssp, esp, sp_mask, old_eip);
719 if (has_error_code) {
720 PUSHL(ssp, esp, sp_mask, error_code);
721 }
722 } else {
723 if (new_stack) {
724 if (env->eflags & VM_MASK) {
725 PUSHW(ssp, esp, sp_mask, env->segs[R_GS].selector);
726 PUSHW(ssp, esp, sp_mask, env->segs[R_FS].selector);
727 PUSHW(ssp, esp, sp_mask, env->segs[R_DS].selector);
728 PUSHW(ssp, esp, sp_mask, env->segs[R_ES].selector);
729 }
730 PUSHW(ssp, esp, sp_mask, env->segs[R_SS].selector);
731 PUSHW(ssp, esp, sp_mask, env->regs[R_ESP]);
732 }
733 PUSHW(ssp, esp, sp_mask, cpu_compute_eflags(env));
734 PUSHW(ssp, esp, sp_mask, env->segs[R_CS].selector);
735 PUSHW(ssp, esp, sp_mask, old_eip);
736 if (has_error_code) {
737 PUSHW(ssp, esp, sp_mask, error_code);
738 }
739 }
740
741 if (new_stack) {
742 if (env->eflags & VM_MASK) {
743 cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0, 0);
744 cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0, 0);
745 cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0, 0);
746 cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0, 0);
747 }
748 ss = (ss & ~3) | dpl;
749 cpu_x86_load_seg_cache(env, R_SS, ss,
750 ssp, get_seg_limit(ss_e1, ss_e2), ss_e2);
751 }
752 SET_ESP(esp, sp_mask);
753
754 selector = (selector & ~3) | dpl;
755 cpu_x86_load_seg_cache(env, R_CS, selector,
756 get_seg_base(e1, e2),
757 get_seg_limit(e1, e2),
758 e2);
759 cpu_x86_set_cpl(env, dpl);
760 env->eip = offset;
761
762 /* interrupt gate clear IF mask */
763 if ((type & 1) == 0) {
764 env->eflags &= ~IF_MASK;
765 }
766 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
767 }
768
769 #ifdef TARGET_X86_64
770
771 #define PUSHQ(sp, val) \
772 { \
773 sp -= 8; \
774 cpu_stq_kernel(env, sp, (val)); \
775 }
776
777 #define POPQ(sp, val) \
778 { \
779 val = cpu_ldq_kernel(env, sp); \
780 sp += 8; \
781 }
782
783 static inline target_ulong get_rsp_from_tss(CPUX86State *env, int level)
784 {
785 int index;
786
787 #if 0
788 printf("TR: base=" TARGET_FMT_lx " limit=%x\n",
789 env->tr.base, env->tr.limit);
790 #endif
791
792 if (!(env->tr.flags & DESC_P_MASK)) {
793 cpu_abort(env, "invalid tss");
794 }
795 index = 8 * level + 4;
796 if ((index + 7) > env->tr.limit) {
797 raise_exception_err(env, EXCP0A_TSS, env->tr.selector & 0xfffc);
798 }
799 return cpu_ldq_kernel(env, env->tr.base + index);
800 }
801
802 /* 64 bit interrupt */
803 static void do_interrupt64(CPUX86State *env, int intno, int is_int,
804 int error_code, target_ulong next_eip, int is_hw)
805 {
806 SegmentCache *dt;
807 target_ulong ptr;
808 int type, dpl, selector, cpl, ist;
809 int has_error_code, new_stack;
810 uint32_t e1, e2, e3, ss;
811 target_ulong old_eip, esp, offset;
812
813 has_error_code = 0;
814 if (!is_int && !is_hw) {
815 has_error_code = exception_has_error_code(intno);
816 }
817 if (is_int) {
818 old_eip = next_eip;
819 } else {
820 old_eip = env->eip;
821 }
822
823 dt = &env->idt;
824 if (intno * 16 + 15 > dt->limit) {
825 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
826 }
827 ptr = dt->base + intno * 16;
828 e1 = cpu_ldl_kernel(env, ptr);
829 e2 = cpu_ldl_kernel(env, ptr + 4);
830 e3 = cpu_ldl_kernel(env, ptr + 8);
831 /* check gate type */
832 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
833 switch (type) {
834 case 14: /* 386 interrupt gate */
835 case 15: /* 386 trap gate */
836 break;
837 default:
838 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
839 break;
840 }
841 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
842 cpl = env->hflags & HF_CPL_MASK;
843 /* check privilege if software int */
844 if (is_int && dpl < cpl) {
845 raise_exception_err(env, EXCP0D_GPF, intno * 16 + 2);
846 }
847 /* check valid bit */
848 if (!(e2 & DESC_P_MASK)) {
849 raise_exception_err(env, EXCP0B_NOSEG, intno * 16 + 2);
850 }
851 selector = e1 >> 16;
852 offset = ((target_ulong)e3 << 32) | (e2 & 0xffff0000) | (e1 & 0x0000ffff);
853 ist = e2 & 7;
854 if ((selector & 0xfffc) == 0) {
855 raise_exception_err(env, EXCP0D_GPF, 0);
856 }
857
858 if (load_segment(env, &e1, &e2, selector) != 0) {
859 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
860 }
861 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
862 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
863 }
864 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
865 if (dpl > cpl) {
866 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
867 }
868 if (!(e2 & DESC_P_MASK)) {
869 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
870 }
871 if (!(e2 & DESC_L_MASK) || (e2 & DESC_B_MASK)) {
872 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
873 }
874 if ((!(e2 & DESC_C_MASK) && dpl < cpl) || ist != 0) {
875 /* to inner privilege */
876 if (ist != 0) {
877 esp = get_rsp_from_tss(env, ist + 3);
878 } else {
879 esp = get_rsp_from_tss(env, dpl);
880 }
881 esp &= ~0xfLL; /* align stack */
882 ss = 0;
883 new_stack = 1;
884 } else if ((e2 & DESC_C_MASK) || dpl == cpl) {
885 /* to same privilege */
886 if (env->eflags & VM_MASK) {
887 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
888 }
889 new_stack = 0;
890 if (ist != 0) {
891 esp = get_rsp_from_tss(env, ist + 3);
892 } else {
893 esp = env->regs[R_ESP];
894 }
895 esp &= ~0xfLL; /* align stack */
896 dpl = cpl;
897 } else {
898 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
899 new_stack = 0; /* avoid warning */
900 esp = 0; /* avoid warning */
901 }
902
903 PUSHQ(esp, env->segs[R_SS].selector);
904 PUSHQ(esp, env->regs[R_ESP]);
905 PUSHQ(esp, cpu_compute_eflags(env));
906 PUSHQ(esp, env->segs[R_CS].selector);
907 PUSHQ(esp, old_eip);
908 if (has_error_code) {
909 PUSHQ(esp, error_code);
910 }
911
912 if (new_stack) {
913 ss = 0 | dpl;
914 cpu_x86_load_seg_cache(env, R_SS, ss, 0, 0, 0);
915 }
916 env->regs[R_ESP] = esp;
917
918 selector = (selector & ~3) | dpl;
919 cpu_x86_load_seg_cache(env, R_CS, selector,
920 get_seg_base(e1, e2),
921 get_seg_limit(e1, e2),
922 e2);
923 cpu_x86_set_cpl(env, dpl);
924 env->eip = offset;
925
926 /* interrupt gate clear IF mask */
927 if ((type & 1) == 0) {
928 env->eflags &= ~IF_MASK;
929 }
930 env->eflags &= ~(TF_MASK | VM_MASK | RF_MASK | NT_MASK);
931 }
932 #endif
933
934 #ifdef TARGET_X86_64
935 #if defined(CONFIG_USER_ONLY)
936 void helper_syscall(CPUX86State *env, int next_eip_addend)
937 {
938 env->exception_index = EXCP_SYSCALL;
939 env->exception_next_eip = env->eip + next_eip_addend;
940 cpu_loop_exit(env);
941 }
942 #else
943 void helper_syscall(CPUX86State *env, int next_eip_addend)
944 {
945 int selector;
946
947 if (!(env->efer & MSR_EFER_SCE)) {
948 raise_exception_err(env, EXCP06_ILLOP, 0);
949 }
950 selector = (env->star >> 32) & 0xffff;
951 if (env->hflags & HF_LMA_MASK) {
952 int code64;
953
954 env->regs[R_ECX] = env->eip + next_eip_addend;
955 env->regs[11] = cpu_compute_eflags(env);
956
957 code64 = env->hflags & HF_CS64_MASK;
958
959 cpu_x86_set_cpl(env, 0);
960 cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
961 0, 0xffffffff,
962 DESC_G_MASK | DESC_P_MASK |
963 DESC_S_MASK |
964 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
965 DESC_L_MASK);
966 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
967 0, 0xffffffff,
968 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
969 DESC_S_MASK |
970 DESC_W_MASK | DESC_A_MASK);
971 env->eflags &= ~env->fmask;
972 cpu_load_eflags(env, env->eflags, 0);
973 if (code64) {
974 env->eip = env->lstar;
975 } else {
976 env->eip = env->cstar;
977 }
978 } else {
979 env->regs[R_ECX] = (uint32_t)(env->eip + next_eip_addend);
980
981 cpu_x86_set_cpl(env, 0);
982 cpu_x86_load_seg_cache(env, R_CS, selector & 0xfffc,
983 0, 0xffffffff,
984 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
985 DESC_S_MASK |
986 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
987 cpu_x86_load_seg_cache(env, R_SS, (selector + 8) & 0xfffc,
988 0, 0xffffffff,
989 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
990 DESC_S_MASK |
991 DESC_W_MASK | DESC_A_MASK);
992 env->eflags &= ~(IF_MASK | RF_MASK | VM_MASK);
993 env->eip = (uint32_t)env->star;
994 }
995 }
996 #endif
997 #endif
998
999 #ifdef TARGET_X86_64
1000 void helper_sysret(CPUX86State *env, int dflag)
1001 {
1002 int cpl, selector;
1003
1004 if (!(env->efer & MSR_EFER_SCE)) {
1005 raise_exception_err(env, EXCP06_ILLOP, 0);
1006 }
1007 cpl = env->hflags & HF_CPL_MASK;
1008 if (!(env->cr[0] & CR0_PE_MASK) || cpl != 0) {
1009 raise_exception_err(env, EXCP0D_GPF, 0);
1010 }
1011 selector = (env->star >> 48) & 0xffff;
1012 if (env->hflags & HF_LMA_MASK) {
1013 if (dflag == 2) {
1014 cpu_x86_load_seg_cache(env, R_CS, (selector + 16) | 3,
1015 0, 0xffffffff,
1016 DESC_G_MASK | DESC_P_MASK |
1017 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1018 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
1019 DESC_L_MASK);
1020 env->eip = env->regs[R_ECX];
1021 } else {
1022 cpu_x86_load_seg_cache(env, R_CS, selector | 3,
1023 0, 0xffffffff,
1024 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1025 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1026 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
1027 env->eip = (uint32_t)env->regs[R_ECX];
1028 }
1029 cpu_x86_load_seg_cache(env, R_SS, selector + 8,
1030 0, 0xffffffff,
1031 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1032 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1033 DESC_W_MASK | DESC_A_MASK);
1034 cpu_load_eflags(env, (uint32_t)(env->regs[11]), TF_MASK | AC_MASK
1035 | ID_MASK | IF_MASK | IOPL_MASK | VM_MASK | RF_MASK |
1036 NT_MASK);
1037 cpu_x86_set_cpl(env, 3);
1038 } else {
1039 cpu_x86_load_seg_cache(env, R_CS, selector | 3,
1040 0, 0xffffffff,
1041 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1042 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1043 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
1044 env->eip = (uint32_t)env->regs[R_ECX];
1045 cpu_x86_load_seg_cache(env, R_SS, selector + 8,
1046 0, 0xffffffff,
1047 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
1048 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
1049 DESC_W_MASK | DESC_A_MASK);
1050 env->eflags |= IF_MASK;
1051 cpu_x86_set_cpl(env, 3);
1052 }
1053 }
1054 #endif
1055
1056 /* real mode interrupt */
1057 static void do_interrupt_real(CPUX86State *env, int intno, int is_int,
1058 int error_code, unsigned int next_eip)
1059 {
1060 SegmentCache *dt;
1061 target_ulong ptr, ssp;
1062 int selector;
1063 uint32_t offset, esp;
1064 uint32_t old_cs, old_eip;
1065
1066 /* real mode (simpler!) */
1067 dt = &env->idt;
1068 if (intno * 4 + 3 > dt->limit) {
1069 raise_exception_err(env, EXCP0D_GPF, intno * 8 + 2);
1070 }
1071 ptr = dt->base + intno * 4;
1072 offset = cpu_lduw_kernel(env, ptr);
1073 selector = cpu_lduw_kernel(env, ptr + 2);
1074 esp = env->regs[R_ESP];
1075 ssp = env->segs[R_SS].base;
1076 if (is_int) {
1077 old_eip = next_eip;
1078 } else {
1079 old_eip = env->eip;
1080 }
1081 old_cs = env->segs[R_CS].selector;
1082 /* XXX: use SS segment size? */
1083 PUSHW(ssp, esp, 0xffff, cpu_compute_eflags(env));
1084 PUSHW(ssp, esp, 0xffff, old_cs);
1085 PUSHW(ssp, esp, 0xffff, old_eip);
1086
1087 /* update processor state */
1088 env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | (esp & 0xffff);
1089 env->eip = offset;
1090 env->segs[R_CS].selector = selector;
1091 env->segs[R_CS].base = (selector << 4);
1092 env->eflags &= ~(IF_MASK | TF_MASK | AC_MASK | RF_MASK);
1093 }
1094
1095 #if defined(CONFIG_USER_ONLY)
1096 /* fake user mode interrupt */
1097 static void do_interrupt_user(CPUX86State *env, int intno, int is_int,
1098 int error_code, target_ulong next_eip)
1099 {
1100 SegmentCache *dt;
1101 target_ulong ptr;
1102 int dpl, cpl, shift;
1103 uint32_t e2;
1104
1105 dt = &env->idt;
1106 if (env->hflags & HF_LMA_MASK) {
1107 shift = 4;
1108 } else {
1109 shift = 3;
1110 }
1111 ptr = dt->base + (intno << shift);
1112 e2 = cpu_ldl_kernel(env, ptr + 4);
1113
1114 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1115 cpl = env->hflags & HF_CPL_MASK;
1116 /* check privilege if software int */
1117 if (is_int && dpl < cpl) {
1118 raise_exception_err(env, EXCP0D_GPF, (intno << shift) + 2);
1119 }
1120
1121 /* Since we emulate only user space, we cannot do more than
1122 exiting the emulation with the suitable exception and error
1123 code */
1124 if (is_int) {
1125 env->eip = next_eip;
1126 }
1127 }
1128
1129 #else
1130
1131 static void handle_even_inj(CPUX86State *env, int intno, int is_int,
1132 int error_code, int is_hw, int rm)
1133 {
1134 uint32_t event_inj = ldl_phys(env->vm_vmcb + offsetof(struct vmcb,
1135 control.event_inj));
1136
1137 if (!(event_inj & SVM_EVTINJ_VALID)) {
1138 int type;
1139
1140 if (is_int) {
1141 type = SVM_EVTINJ_TYPE_SOFT;
1142 } else {
1143 type = SVM_EVTINJ_TYPE_EXEPT;
1144 }
1145 event_inj = intno | type | SVM_EVTINJ_VALID;
1146 if (!rm && exception_has_error_code(intno)) {
1147 event_inj |= SVM_EVTINJ_VALID_ERR;
1148 stl_phys(env->vm_vmcb + offsetof(struct vmcb,
1149 control.event_inj_err),
1150 error_code);
1151 }
1152 stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
1153 event_inj);
1154 }
1155 }
1156 #endif
1157
1158 /*
1159 * Begin execution of an interruption. is_int is TRUE if coming from
1160 * the int instruction. next_eip is the env->eip value AFTER the interrupt
1161 * instruction. It is only relevant if is_int is TRUE.
1162 */
1163 static void do_interrupt_all(X86CPU *cpu, int intno, int is_int,
1164 int error_code, target_ulong next_eip, int is_hw)
1165 {
1166 CPUX86State *env = &cpu->env;
1167
1168 if (qemu_loglevel_mask(CPU_LOG_INT)) {
1169 if ((env->cr[0] & CR0_PE_MASK)) {
1170 static int count;
1171
1172 qemu_log("%6d: v=%02x e=%04x i=%d cpl=%d IP=%04x:" TARGET_FMT_lx
1173 " pc=" TARGET_FMT_lx " SP=%04x:" TARGET_FMT_lx,
1174 count, intno, error_code, is_int,
1175 env->hflags & HF_CPL_MASK,
1176 env->segs[R_CS].selector, env->eip,
1177 (int)env->segs[R_CS].base + env->eip,
1178 env->segs[R_SS].selector, env->regs[R_ESP]);
1179 if (intno == 0x0e) {
1180 qemu_log(" CR2=" TARGET_FMT_lx, env->cr[2]);
1181 } else {
1182 qemu_log(" env->regs[R_EAX]=" TARGET_FMT_lx, env->regs[R_EAX]);
1183 }
1184 qemu_log("\n");
1185 log_cpu_state(CPU(cpu), CPU_DUMP_CCOP);
1186 #if 0
1187 {
1188 int i;
1189 target_ulong ptr;
1190
1191 qemu_log(" code=");
1192 ptr = env->segs[R_CS].base + env->eip;
1193 for (i = 0; i < 16; i++) {
1194 qemu_log(" %02x", ldub(ptr + i));
1195 }
1196 qemu_log("\n");
1197 }
1198 #endif
1199 count++;
1200 }
1201 }
1202 if (env->cr[0] & CR0_PE_MASK) {
1203 #if !defined(CONFIG_USER_ONLY)
1204 if (env->hflags & HF_SVMI_MASK) {
1205 handle_even_inj(env, intno, is_int, error_code, is_hw, 0);
1206 }
1207 #endif
1208 #ifdef TARGET_X86_64
1209 if (env->hflags & HF_LMA_MASK) {
1210 do_interrupt64(env, intno, is_int, error_code, next_eip, is_hw);
1211 } else
1212 #endif
1213 {
1214 do_interrupt_protected(env, intno, is_int, error_code, next_eip,
1215 is_hw);
1216 }
1217 } else {
1218 #if !defined(CONFIG_USER_ONLY)
1219 if (env->hflags & HF_SVMI_MASK) {
1220 handle_even_inj(env, intno, is_int, error_code, is_hw, 1);
1221 }
1222 #endif
1223 do_interrupt_real(env, intno, is_int, error_code, next_eip);
1224 }
1225
1226 #if !defined(CONFIG_USER_ONLY)
1227 if (env->hflags & HF_SVMI_MASK) {
1228 uint32_t event_inj = ldl_phys(env->vm_vmcb +
1229 offsetof(struct vmcb,
1230 control.event_inj));
1231
1232 stl_phys(env->vm_vmcb + offsetof(struct vmcb, control.event_inj),
1233 event_inj & ~SVM_EVTINJ_VALID);
1234 }
1235 #endif
1236 }
1237
1238 void x86_cpu_do_interrupt(CPUState *cs)
1239 {
1240 X86CPU *cpu = X86_CPU(cs);
1241 CPUX86State *env = &cpu->env;
1242
1243 #if defined(CONFIG_USER_ONLY)
1244 /* if user mode only, we simulate a fake exception
1245 which will be handled outside the cpu execution
1246 loop */
1247 do_interrupt_user(env, env->exception_index,
1248 env->exception_is_int,
1249 env->error_code,
1250 env->exception_next_eip);
1251 /* successfully delivered */
1252 env->old_exception = -1;
1253 #else
1254 /* simulate a real cpu exception. On i386, it can
1255 trigger new exceptions, but we do not handle
1256 double or triple faults yet. */
1257 do_interrupt_all(cpu, env->exception_index,
1258 env->exception_is_int,
1259 env->error_code,
1260 env->exception_next_eip, 0);
1261 /* successfully delivered */
1262 env->old_exception = -1;
1263 #endif
1264 }
1265
1266 void do_interrupt_x86_hardirq(CPUX86State *env, int intno, int is_hw)
1267 {
1268 do_interrupt_all(x86_env_get_cpu(env), intno, 0, 0, 0, is_hw);
1269 }
1270
1271 void helper_enter_level(CPUX86State *env, int level, int data32,
1272 target_ulong t1)
1273 {
1274 target_ulong ssp;
1275 uint32_t esp_mask, esp, ebp;
1276
1277 esp_mask = get_sp_mask(env->segs[R_SS].flags);
1278 ssp = env->segs[R_SS].base;
1279 ebp = env->regs[R_EBP];
1280 esp = env->regs[R_ESP];
1281 if (data32) {
1282 /* 32 bit */
1283 esp -= 4;
1284 while (--level) {
1285 esp -= 4;
1286 ebp -= 4;
1287 cpu_stl_data(env, ssp + (esp & esp_mask),
1288 cpu_ldl_data(env, ssp + (ebp & esp_mask)));
1289 }
1290 esp -= 4;
1291 cpu_stl_data(env, ssp + (esp & esp_mask), t1);
1292 } else {
1293 /* 16 bit */
1294 esp -= 2;
1295 while (--level) {
1296 esp -= 2;
1297 ebp -= 2;
1298 cpu_stw_data(env, ssp + (esp & esp_mask),
1299 cpu_lduw_data(env, ssp + (ebp & esp_mask)));
1300 }
1301 esp -= 2;
1302 cpu_stw_data(env, ssp + (esp & esp_mask), t1);
1303 }
1304 }
1305
1306 #ifdef TARGET_X86_64
1307 void helper_enter64_level(CPUX86State *env, int level, int data64,
1308 target_ulong t1)
1309 {
1310 target_ulong esp, ebp;
1311
1312 ebp = env->regs[R_EBP];
1313 esp = env->regs[R_ESP];
1314
1315 if (data64) {
1316 /* 64 bit */
1317 esp -= 8;
1318 while (--level) {
1319 esp -= 8;
1320 ebp -= 8;
1321 cpu_stq_data(env, esp, cpu_ldq_data(env, ebp));
1322 }
1323 esp -= 8;
1324 cpu_stq_data(env, esp, t1);
1325 } else {
1326 /* 16 bit */
1327 esp -= 2;
1328 while (--level) {
1329 esp -= 2;
1330 ebp -= 2;
1331 cpu_stw_data(env, esp, cpu_lduw_data(env, ebp));
1332 }
1333 esp -= 2;
1334 cpu_stw_data(env, esp, t1);
1335 }
1336 }
1337 #endif
1338
1339 void helper_lldt(CPUX86State *env, int selector)
1340 {
1341 SegmentCache *dt;
1342 uint32_t e1, e2;
1343 int index, entry_limit;
1344 target_ulong ptr;
1345
1346 selector &= 0xffff;
1347 if ((selector & 0xfffc) == 0) {
1348 /* XXX: NULL selector case: invalid LDT */
1349 env->ldt.base = 0;
1350 env->ldt.limit = 0;
1351 } else {
1352 if (selector & 0x4) {
1353 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1354 }
1355 dt = &env->gdt;
1356 index = selector & ~7;
1357 #ifdef TARGET_X86_64
1358 if (env->hflags & HF_LMA_MASK) {
1359 entry_limit = 15;
1360 } else
1361 #endif
1362 {
1363 entry_limit = 7;
1364 }
1365 if ((index + entry_limit) > dt->limit) {
1366 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1367 }
1368 ptr = dt->base + index;
1369 e1 = cpu_ldl_kernel(env, ptr);
1370 e2 = cpu_ldl_kernel(env, ptr + 4);
1371 if ((e2 & DESC_S_MASK) || ((e2 >> DESC_TYPE_SHIFT) & 0xf) != 2) {
1372 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1373 }
1374 if (!(e2 & DESC_P_MASK)) {
1375 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
1376 }
1377 #ifdef TARGET_X86_64
1378 if (env->hflags & HF_LMA_MASK) {
1379 uint32_t e3;
1380
1381 e3 = cpu_ldl_kernel(env, ptr + 8);
1382 load_seg_cache_raw_dt(&env->ldt, e1, e2);
1383 env->ldt.base |= (target_ulong)e3 << 32;
1384 } else
1385 #endif
1386 {
1387 load_seg_cache_raw_dt(&env->ldt, e1, e2);
1388 }
1389 }
1390 env->ldt.selector = selector;
1391 }
1392
1393 void helper_ltr(CPUX86State *env, int selector)
1394 {
1395 SegmentCache *dt;
1396 uint32_t e1, e2;
1397 int index, type, entry_limit;
1398 target_ulong ptr;
1399
1400 selector &= 0xffff;
1401 if ((selector & 0xfffc) == 0) {
1402 /* NULL selector case: invalid TR */
1403 env->tr.base = 0;
1404 env->tr.limit = 0;
1405 env->tr.flags = 0;
1406 } else {
1407 if (selector & 0x4) {
1408 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1409 }
1410 dt = &env->gdt;
1411 index = selector & ~7;
1412 #ifdef TARGET_X86_64
1413 if (env->hflags & HF_LMA_MASK) {
1414 entry_limit = 15;
1415 } else
1416 #endif
1417 {
1418 entry_limit = 7;
1419 }
1420 if ((index + entry_limit) > dt->limit) {
1421 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1422 }
1423 ptr = dt->base + index;
1424 e1 = cpu_ldl_kernel(env, ptr);
1425 e2 = cpu_ldl_kernel(env, ptr + 4);
1426 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
1427 if ((e2 & DESC_S_MASK) ||
1428 (type != 1 && type != 9)) {
1429 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1430 }
1431 if (!(e2 & DESC_P_MASK)) {
1432 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
1433 }
1434 #ifdef TARGET_X86_64
1435 if (env->hflags & HF_LMA_MASK) {
1436 uint32_t e3, e4;
1437
1438 e3 = cpu_ldl_kernel(env, ptr + 8);
1439 e4 = cpu_ldl_kernel(env, ptr + 12);
1440 if ((e4 >> DESC_TYPE_SHIFT) & 0xf) {
1441 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1442 }
1443 load_seg_cache_raw_dt(&env->tr, e1, e2);
1444 env->tr.base |= (target_ulong)e3 << 32;
1445 } else
1446 #endif
1447 {
1448 load_seg_cache_raw_dt(&env->tr, e1, e2);
1449 }
1450 e2 |= DESC_TSS_BUSY_MASK;
1451 cpu_stl_kernel(env, ptr + 4, e2);
1452 }
1453 env->tr.selector = selector;
1454 }
1455
1456 /* only works if protected mode and not VM86. seg_reg must be != R_CS */
1457 void helper_load_seg(CPUX86State *env, int seg_reg, int selector)
1458 {
1459 uint32_t e1, e2;
1460 int cpl, dpl, rpl;
1461 SegmentCache *dt;
1462 int index;
1463 target_ulong ptr;
1464
1465 selector &= 0xffff;
1466 cpl = env->hflags & HF_CPL_MASK;
1467 if ((selector & 0xfffc) == 0) {
1468 /* null selector case */
1469 if (seg_reg == R_SS
1470 #ifdef TARGET_X86_64
1471 && (!(env->hflags & HF_CS64_MASK) || cpl == 3)
1472 #endif
1473 ) {
1474 raise_exception_err(env, EXCP0D_GPF, 0);
1475 }
1476 cpu_x86_load_seg_cache(env, seg_reg, selector, 0, 0, 0);
1477 } else {
1478
1479 if (selector & 0x4) {
1480 dt = &env->ldt;
1481 } else {
1482 dt = &env->gdt;
1483 }
1484 index = selector & ~7;
1485 if ((index + 7) > dt->limit) {
1486 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1487 }
1488 ptr = dt->base + index;
1489 e1 = cpu_ldl_kernel(env, ptr);
1490 e2 = cpu_ldl_kernel(env, ptr + 4);
1491
1492 if (!(e2 & DESC_S_MASK)) {
1493 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1494 }
1495 rpl = selector & 3;
1496 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1497 if (seg_reg == R_SS) {
1498 /* must be writable segment */
1499 if ((e2 & DESC_CS_MASK) || !(e2 & DESC_W_MASK)) {
1500 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1501 }
1502 if (rpl != cpl || dpl != cpl) {
1503 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1504 }
1505 } else {
1506 /* must be readable segment */
1507 if ((e2 & (DESC_CS_MASK | DESC_R_MASK)) == DESC_CS_MASK) {
1508 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1509 }
1510
1511 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
1512 /* if not conforming code, test rights */
1513 if (dpl < cpl || dpl < rpl) {
1514 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1515 }
1516 }
1517 }
1518
1519 if (!(e2 & DESC_P_MASK)) {
1520 if (seg_reg == R_SS) {
1521 raise_exception_err(env, EXCP0C_STACK, selector & 0xfffc);
1522 } else {
1523 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
1524 }
1525 }
1526
1527 /* set the access bit if not already set */
1528 if (!(e2 & DESC_A_MASK)) {
1529 e2 |= DESC_A_MASK;
1530 cpu_stl_kernel(env, ptr + 4, e2);
1531 }
1532
1533 cpu_x86_load_seg_cache(env, seg_reg, selector,
1534 get_seg_base(e1, e2),
1535 get_seg_limit(e1, e2),
1536 e2);
1537 #if 0
1538 qemu_log("load_seg: sel=0x%04x base=0x%08lx limit=0x%08lx flags=%08x\n",
1539 selector, (unsigned long)sc->base, sc->limit, sc->flags);
1540 #endif
1541 }
1542 }
1543
1544 /* protected mode jump */
1545 void helper_ljmp_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
1546 int next_eip_addend)
1547 {
1548 int gate_cs, type;
1549 uint32_t e1, e2, cpl, dpl, rpl, limit;
1550 target_ulong next_eip;
1551
1552 if ((new_cs & 0xfffc) == 0) {
1553 raise_exception_err(env, EXCP0D_GPF, 0);
1554 }
1555 if (load_segment(env, &e1, &e2, new_cs) != 0) {
1556 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1557 }
1558 cpl = env->hflags & HF_CPL_MASK;
1559 if (e2 & DESC_S_MASK) {
1560 if (!(e2 & DESC_CS_MASK)) {
1561 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1562 }
1563 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1564 if (e2 & DESC_C_MASK) {
1565 /* conforming code segment */
1566 if (dpl > cpl) {
1567 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1568 }
1569 } else {
1570 /* non conforming code segment */
1571 rpl = new_cs & 3;
1572 if (rpl > cpl) {
1573 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1574 }
1575 if (dpl != cpl) {
1576 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1577 }
1578 }
1579 if (!(e2 & DESC_P_MASK)) {
1580 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
1581 }
1582 limit = get_seg_limit(e1, e2);
1583 if (new_eip > limit &&
1584 !(env->hflags & HF_LMA_MASK) && !(e2 & DESC_L_MASK)) {
1585 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1586 }
1587 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1588 get_seg_base(e1, e2), limit, e2);
1589 env->eip = new_eip;
1590 } else {
1591 /* jump to call or task gate */
1592 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1593 rpl = new_cs & 3;
1594 cpl = env->hflags & HF_CPL_MASK;
1595 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
1596 switch (type) {
1597 case 1: /* 286 TSS */
1598 case 9: /* 386 TSS */
1599 case 5: /* task gate */
1600 if (dpl < cpl || dpl < rpl) {
1601 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1602 }
1603 next_eip = env->eip + next_eip_addend;
1604 switch_tss(env, new_cs, e1, e2, SWITCH_TSS_JMP, next_eip);
1605 CC_OP = CC_OP_EFLAGS;
1606 break;
1607 case 4: /* 286 call gate */
1608 case 12: /* 386 call gate */
1609 if ((dpl < cpl) || (dpl < rpl)) {
1610 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1611 }
1612 if (!(e2 & DESC_P_MASK)) {
1613 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
1614 }
1615 gate_cs = e1 >> 16;
1616 new_eip = (e1 & 0xffff);
1617 if (type == 12) {
1618 new_eip |= (e2 & 0xffff0000);
1619 }
1620 if (load_segment(env, &e1, &e2, gate_cs) != 0) {
1621 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
1622 }
1623 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1624 /* must be code segment */
1625 if (((e2 & (DESC_S_MASK | DESC_CS_MASK)) !=
1626 (DESC_S_MASK | DESC_CS_MASK))) {
1627 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
1628 }
1629 if (((e2 & DESC_C_MASK) && (dpl > cpl)) ||
1630 (!(e2 & DESC_C_MASK) && (dpl != cpl))) {
1631 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
1632 }
1633 if (!(e2 & DESC_P_MASK)) {
1634 raise_exception_err(env, EXCP0D_GPF, gate_cs & 0xfffc);
1635 }
1636 limit = get_seg_limit(e1, e2);
1637 if (new_eip > limit) {
1638 raise_exception_err(env, EXCP0D_GPF, 0);
1639 }
1640 cpu_x86_load_seg_cache(env, R_CS, (gate_cs & 0xfffc) | cpl,
1641 get_seg_base(e1, e2), limit, e2);
1642 env->eip = new_eip;
1643 break;
1644 default:
1645 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1646 break;
1647 }
1648 }
1649 }
1650
1651 /* real mode call */
1652 void helper_lcall_real(CPUX86State *env, int new_cs, target_ulong new_eip1,
1653 int shift, int next_eip)
1654 {
1655 int new_eip;
1656 uint32_t esp, esp_mask;
1657 target_ulong ssp;
1658
1659 new_eip = new_eip1;
1660 esp = env->regs[R_ESP];
1661 esp_mask = get_sp_mask(env->segs[R_SS].flags);
1662 ssp = env->segs[R_SS].base;
1663 if (shift) {
1664 PUSHL(ssp, esp, esp_mask, env->segs[R_CS].selector);
1665 PUSHL(ssp, esp, esp_mask, next_eip);
1666 } else {
1667 PUSHW(ssp, esp, esp_mask, env->segs[R_CS].selector);
1668 PUSHW(ssp, esp, esp_mask, next_eip);
1669 }
1670
1671 SET_ESP(esp, esp_mask);
1672 env->eip = new_eip;
1673 env->segs[R_CS].selector = new_cs;
1674 env->segs[R_CS].base = (new_cs << 4);
1675 }
1676
1677 /* protected mode call */
1678 void helper_lcall_protected(CPUX86State *env, int new_cs, target_ulong new_eip,
1679 int shift, int next_eip_addend)
1680 {
1681 int new_stack, i;
1682 uint32_t e1, e2, cpl, dpl, rpl, selector, offset, param_count;
1683 uint32_t ss = 0, ss_e1 = 0, ss_e2 = 0, sp, type, ss_dpl, sp_mask;
1684 uint32_t val, limit, old_sp_mask;
1685 target_ulong ssp, old_ssp, next_eip;
1686
1687 next_eip = env->eip + next_eip_addend;
1688 LOG_PCALL("lcall %04x:%08x s=%d\n", new_cs, (uint32_t)new_eip, shift);
1689 LOG_PCALL_STATE(CPU(x86_env_get_cpu(env)));
1690 if ((new_cs & 0xfffc) == 0) {
1691 raise_exception_err(env, EXCP0D_GPF, 0);
1692 }
1693 if (load_segment(env, &e1, &e2, new_cs) != 0) {
1694 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1695 }
1696 cpl = env->hflags & HF_CPL_MASK;
1697 LOG_PCALL("desc=%08x:%08x\n", e1, e2);
1698 if (e2 & DESC_S_MASK) {
1699 if (!(e2 & DESC_CS_MASK)) {
1700 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1701 }
1702 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1703 if (e2 & DESC_C_MASK) {
1704 /* conforming code segment */
1705 if (dpl > cpl) {
1706 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1707 }
1708 } else {
1709 /* non conforming code segment */
1710 rpl = new_cs & 3;
1711 if (rpl > cpl) {
1712 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1713 }
1714 if (dpl != cpl) {
1715 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1716 }
1717 }
1718 if (!(e2 & DESC_P_MASK)) {
1719 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
1720 }
1721
1722 #ifdef TARGET_X86_64
1723 /* XXX: check 16/32 bit cases in long mode */
1724 if (shift == 2) {
1725 target_ulong rsp;
1726
1727 /* 64 bit case */
1728 rsp = env->regs[R_ESP];
1729 PUSHQ(rsp, env->segs[R_CS].selector);
1730 PUSHQ(rsp, next_eip);
1731 /* from this point, not restartable */
1732 env->regs[R_ESP] = rsp;
1733 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1734 get_seg_base(e1, e2),
1735 get_seg_limit(e1, e2), e2);
1736 env->eip = new_eip;
1737 } else
1738 #endif
1739 {
1740 sp = env->regs[R_ESP];
1741 sp_mask = get_sp_mask(env->segs[R_SS].flags);
1742 ssp = env->segs[R_SS].base;
1743 if (shift) {
1744 PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
1745 PUSHL(ssp, sp, sp_mask, next_eip);
1746 } else {
1747 PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
1748 PUSHW(ssp, sp, sp_mask, next_eip);
1749 }
1750
1751 limit = get_seg_limit(e1, e2);
1752 if (new_eip > limit) {
1753 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1754 }
1755 /* from this point, not restartable */
1756 SET_ESP(sp, sp_mask);
1757 cpu_x86_load_seg_cache(env, R_CS, (new_cs & 0xfffc) | cpl,
1758 get_seg_base(e1, e2), limit, e2);
1759 env->eip = new_eip;
1760 }
1761 } else {
1762 /* check gate type */
1763 type = (e2 >> DESC_TYPE_SHIFT) & 0x1f;
1764 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1765 rpl = new_cs & 3;
1766 switch (type) {
1767 case 1: /* available 286 TSS */
1768 case 9: /* available 386 TSS */
1769 case 5: /* task gate */
1770 if (dpl < cpl || dpl < rpl) {
1771 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1772 }
1773 switch_tss(env, new_cs, e1, e2, SWITCH_TSS_CALL, next_eip);
1774 CC_OP = CC_OP_EFLAGS;
1775 return;
1776 case 4: /* 286 call gate */
1777 case 12: /* 386 call gate */
1778 break;
1779 default:
1780 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1781 break;
1782 }
1783 shift = type >> 3;
1784
1785 if (dpl < cpl || dpl < rpl) {
1786 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
1787 }
1788 /* check valid bit */
1789 if (!(e2 & DESC_P_MASK)) {
1790 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
1791 }
1792 selector = e1 >> 16;
1793 offset = (e2 & 0xffff0000) | (e1 & 0x0000ffff);
1794 param_count = e2 & 0x1f;
1795 if ((selector & 0xfffc) == 0) {
1796 raise_exception_err(env, EXCP0D_GPF, 0);
1797 }
1798
1799 if (load_segment(env, &e1, &e2, selector) != 0) {
1800 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1801 }
1802 if (!(e2 & DESC_S_MASK) || !(e2 & (DESC_CS_MASK))) {
1803 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1804 }
1805 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1806 if (dpl > cpl) {
1807 raise_exception_err(env, EXCP0D_GPF, selector & 0xfffc);
1808 }
1809 if (!(e2 & DESC_P_MASK)) {
1810 raise_exception_err(env, EXCP0B_NOSEG, selector & 0xfffc);
1811 }
1812
1813 if (!(e2 & DESC_C_MASK) && dpl < cpl) {
1814 /* to inner privilege */
1815 get_ss_esp_from_tss(env, &ss, &sp, dpl);
1816 LOG_PCALL("new ss:esp=%04x:%08x param_count=%d env->regs[R_ESP]="
1817 TARGET_FMT_lx "\n", ss, sp, param_count,
1818 env->regs[R_ESP]);
1819 if ((ss & 0xfffc) == 0) {
1820 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1821 }
1822 if ((ss & 3) != dpl) {
1823 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1824 }
1825 if (load_segment(env, &ss_e1, &ss_e2, ss) != 0) {
1826 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1827 }
1828 ss_dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
1829 if (ss_dpl != dpl) {
1830 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1831 }
1832 if (!(ss_e2 & DESC_S_MASK) ||
1833 (ss_e2 & DESC_CS_MASK) ||
1834 !(ss_e2 & DESC_W_MASK)) {
1835 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1836 }
1837 if (!(ss_e2 & DESC_P_MASK)) {
1838 raise_exception_err(env, EXCP0A_TSS, ss & 0xfffc);
1839 }
1840
1841 /* push_size = ((param_count * 2) + 8) << shift; */
1842
1843 old_sp_mask = get_sp_mask(env->segs[R_SS].flags);
1844 old_ssp = env->segs[R_SS].base;
1845
1846 sp_mask = get_sp_mask(ss_e2);
1847 ssp = get_seg_base(ss_e1, ss_e2);
1848 if (shift) {
1849 PUSHL(ssp, sp, sp_mask, env->segs[R_SS].selector);
1850 PUSHL(ssp, sp, sp_mask, env->regs[R_ESP]);
1851 for (i = param_count - 1; i >= 0; i--) {
1852 val = cpu_ldl_kernel(env, old_ssp +
1853 ((env->regs[R_ESP] + i * 4) &
1854 old_sp_mask));
1855 PUSHL(ssp, sp, sp_mask, val);
1856 }
1857 } else {
1858 PUSHW(ssp, sp, sp_mask, env->segs[R_SS].selector);
1859 PUSHW(ssp, sp, sp_mask, env->regs[R_ESP]);
1860 for (i = param_count - 1; i >= 0; i--) {
1861 val = cpu_lduw_kernel(env, old_ssp +
1862 ((env->regs[R_ESP] + i * 2) &
1863 old_sp_mask));
1864 PUSHW(ssp, sp, sp_mask, val);
1865 }
1866 }
1867 new_stack = 1;
1868 } else {
1869 /* to same privilege */
1870 sp = env->regs[R_ESP];
1871 sp_mask = get_sp_mask(env->segs[R_SS].flags);
1872 ssp = env->segs[R_SS].base;
1873 /* push_size = (4 << shift); */
1874 new_stack = 0;
1875 }
1876
1877 if (shift) {
1878 PUSHL(ssp, sp, sp_mask, env->segs[R_CS].selector);
1879 PUSHL(ssp, sp, sp_mask, next_eip);
1880 } else {
1881 PUSHW(ssp, sp, sp_mask, env->segs[R_CS].selector);
1882 PUSHW(ssp, sp, sp_mask, next_eip);
1883 }
1884
1885 /* from this point, not restartable */
1886
1887 if (new_stack) {
1888 ss = (ss & ~3) | dpl;
1889 cpu_x86_load_seg_cache(env, R_SS, ss,
1890 ssp,
1891 get_seg_limit(ss_e1, ss_e2),
1892 ss_e2);
1893 }
1894
1895 selector = (selector & ~3) | dpl;
1896 cpu_x86_load_seg_cache(env, R_CS, selector,
1897 get_seg_base(e1, e2),
1898 get_seg_limit(e1, e2),
1899 e2);
1900 cpu_x86_set_cpl(env, dpl);
1901 SET_ESP(sp, sp_mask);
1902 env->eip = offset;
1903 }
1904 }
1905
1906 /* real and vm86 mode iret */
1907 void helper_iret_real(CPUX86State *env, int shift)
1908 {
1909 uint32_t sp, new_cs, new_eip, new_eflags, sp_mask;
1910 target_ulong ssp;
1911 int eflags_mask;
1912
1913 sp_mask = 0xffff; /* XXXX: use SS segment size? */
1914 sp = env->regs[R_ESP];
1915 ssp = env->segs[R_SS].base;
1916 if (shift == 1) {
1917 /* 32 bits */
1918 POPL(ssp, sp, sp_mask, new_eip);
1919 POPL(ssp, sp, sp_mask, new_cs);
1920 new_cs &= 0xffff;
1921 POPL(ssp, sp, sp_mask, new_eflags);
1922 } else {
1923 /* 16 bits */
1924 POPW(ssp, sp, sp_mask, new_eip);
1925 POPW(ssp, sp, sp_mask, new_cs);
1926 POPW(ssp, sp, sp_mask, new_eflags);
1927 }
1928 env->regs[R_ESP] = (env->regs[R_ESP] & ~sp_mask) | (sp & sp_mask);
1929 env->segs[R_CS].selector = new_cs;
1930 env->segs[R_CS].base = (new_cs << 4);
1931 env->eip = new_eip;
1932 if (env->eflags & VM_MASK) {
1933 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | RF_MASK |
1934 NT_MASK;
1935 } else {
1936 eflags_mask = TF_MASK | AC_MASK | ID_MASK | IF_MASK | IOPL_MASK |
1937 RF_MASK | NT_MASK;
1938 }
1939 if (shift == 0) {
1940 eflags_mask &= 0xffff;
1941 }
1942 cpu_load_eflags(env, new_eflags, eflags_mask);
1943 env->hflags2 &= ~HF2_NMI_MASK;
1944 }
1945
1946 static inline void validate_seg(CPUX86State *env, int seg_reg, int cpl)
1947 {
1948 int dpl;
1949 uint32_t e2;
1950
1951 /* XXX: on x86_64, we do not want to nullify FS and GS because
1952 they may still contain a valid base. I would be interested to
1953 know how a real x86_64 CPU behaves */
1954 if ((seg_reg == R_FS || seg_reg == R_GS) &&
1955 (env->segs[seg_reg].selector & 0xfffc) == 0) {
1956 return;
1957 }
1958
1959 e2 = env->segs[seg_reg].flags;
1960 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
1961 if (!(e2 & DESC_CS_MASK) || !(e2 & DESC_C_MASK)) {
1962 /* data or non conforming code segment */
1963 if (dpl < cpl) {
1964 cpu_x86_load_seg_cache(env, seg_reg, 0, 0, 0, 0);
1965 }
1966 }
1967 }
1968
1969 /* protected mode iret */
1970 static inline void helper_ret_protected(CPUX86State *env, int shift,
1971 int is_iret, int addend)
1972 {
1973 uint32_t new_cs, new_eflags, new_ss;
1974 uint32_t new_es, new_ds, new_fs, new_gs;
1975 uint32_t e1, e2, ss_e1, ss_e2;
1976 int cpl, dpl, rpl, eflags_mask, iopl;
1977 target_ulong ssp, sp, new_eip, new_esp, sp_mask;
1978
1979 #ifdef TARGET_X86_64
1980 if (shift == 2) {
1981 sp_mask = -1;
1982 } else
1983 #endif
1984 {
1985 sp_mask = get_sp_mask(env->segs[R_SS].flags);
1986 }
1987 sp = env->regs[R_ESP];
1988 ssp = env->segs[R_SS].base;
1989 new_eflags = 0; /* avoid warning */
1990 #ifdef TARGET_X86_64
1991 if (shift == 2) {
1992 POPQ(sp, new_eip);
1993 POPQ(sp, new_cs);
1994 new_cs &= 0xffff;
1995 if (is_iret) {
1996 POPQ(sp, new_eflags);
1997 }
1998 } else
1999 #endif
2000 {
2001 if (shift == 1) {
2002 /* 32 bits */
2003 POPL(ssp, sp, sp_mask, new_eip);
2004 POPL(ssp, sp, sp_mask, new_cs);
2005 new_cs &= 0xffff;
2006 if (is_iret) {
2007 POPL(ssp, sp, sp_mask, new_eflags);
2008 if (new_eflags & VM_MASK) {
2009 goto return_to_vm86;
2010 }
2011 }
2012 } else {
2013 /* 16 bits */
2014 POPW(ssp, sp, sp_mask, new_eip);
2015 POPW(ssp, sp, sp_mask, new_cs);
2016 if (is_iret) {
2017 POPW(ssp, sp, sp_mask, new_eflags);
2018 }
2019 }
2020 }
2021 LOG_PCALL("lret new %04x:" TARGET_FMT_lx " s=%d addend=0x%x\n",
2022 new_cs, new_eip, shift, addend);
2023 LOG_PCALL_STATE(CPU(x86_env_get_cpu(env)));
2024 if ((new_cs & 0xfffc) == 0) {
2025 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2026 }
2027 if (load_segment(env, &e1, &e2, new_cs) != 0) {
2028 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2029 }
2030 if (!(e2 & DESC_S_MASK) ||
2031 !(e2 & DESC_CS_MASK)) {
2032 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2033 }
2034 cpl = env->hflags & HF_CPL_MASK;
2035 rpl = new_cs & 3;
2036 if (rpl < cpl) {
2037 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2038 }
2039 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2040 if (e2 & DESC_C_MASK) {
2041 if (dpl > rpl) {
2042 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2043 }
2044 } else {
2045 if (dpl != rpl) {
2046 raise_exception_err(env, EXCP0D_GPF, new_cs & 0xfffc);
2047 }
2048 }
2049 if (!(e2 & DESC_P_MASK)) {
2050 raise_exception_err(env, EXCP0B_NOSEG, new_cs & 0xfffc);
2051 }
2052
2053 sp += addend;
2054 if (rpl == cpl && (!(env->hflags & HF_CS64_MASK) ||
2055 ((env->hflags & HF_CS64_MASK) && !is_iret))) {
2056 /* return to same privilege level */
2057 cpu_x86_load_seg_cache(env, R_CS, new_cs,
2058 get_seg_base(e1, e2),
2059 get_seg_limit(e1, e2),
2060 e2);
2061 } else {
2062 /* return to different privilege level */
2063 #ifdef TARGET_X86_64
2064 if (shift == 2) {
2065 POPQ(sp, new_esp);
2066 POPQ(sp, new_ss);
2067 new_ss &= 0xffff;
2068 } else
2069 #endif
2070 {
2071 if (shift == 1) {
2072 /* 32 bits */
2073 POPL(ssp, sp, sp_mask, new_esp);
2074 POPL(ssp, sp, sp_mask, new_ss);
2075 new_ss &= 0xffff;
2076 } else {
2077 /* 16 bits */
2078 POPW(ssp, sp, sp_mask, new_esp);
2079 POPW(ssp, sp, sp_mask, new_ss);
2080 }
2081 }
2082 LOG_PCALL("new ss:esp=%04x:" TARGET_FMT_lx "\n",
2083 new_ss, new_esp);
2084 if ((new_ss & 0xfffc) == 0) {
2085 #ifdef TARGET_X86_64
2086 /* NULL ss is allowed in long mode if cpl != 3 */
2087 /* XXX: test CS64? */
2088 if ((env->hflags & HF_LMA_MASK) && rpl != 3) {
2089 cpu_x86_load_seg_cache(env, R_SS, new_ss,
2090 0, 0xffffffff,
2091 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2092 DESC_S_MASK | (rpl << DESC_DPL_SHIFT) |
2093 DESC_W_MASK | DESC_A_MASK);
2094 ss_e2 = DESC_B_MASK; /* XXX: should not be needed? */
2095 } else
2096 #endif
2097 {
2098 raise_exception_err(env, EXCP0D_GPF, 0);
2099 }
2100 } else {
2101 if ((new_ss & 3) != rpl) {
2102 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
2103 }
2104 if (load_segment(env, &ss_e1, &ss_e2, new_ss) != 0) {
2105 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
2106 }
2107 if (!(ss_e2 & DESC_S_MASK) ||
2108 (ss_e2 & DESC_CS_MASK) ||
2109 !(ss_e2 & DESC_W_MASK)) {
2110 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
2111 }
2112 dpl = (ss_e2 >> DESC_DPL_SHIFT) & 3;
2113 if (dpl != rpl) {
2114 raise_exception_err(env, EXCP0D_GPF, new_ss & 0xfffc);
2115 }
2116 if (!(ss_e2 & DESC_P_MASK)) {
2117 raise_exception_err(env, EXCP0B_NOSEG, new_ss & 0xfffc);
2118 }
2119 cpu_x86_load_seg_cache(env, R_SS, new_ss,
2120 get_seg_base(ss_e1, ss_e2),
2121 get_seg_limit(ss_e1, ss_e2),
2122 ss_e2);
2123 }
2124
2125 cpu_x86_load_seg_cache(env, R_CS, new_cs,
2126 get_seg_base(e1, e2),
2127 get_seg_limit(e1, e2),
2128 e2);
2129 cpu_x86_set_cpl(env, rpl);
2130 sp = new_esp;
2131 #ifdef TARGET_X86_64
2132 if (env->hflags & HF_CS64_MASK) {
2133 sp_mask = -1;
2134 } else
2135 #endif
2136 {
2137 sp_mask = get_sp_mask(ss_e2);
2138 }
2139
2140 /* validate data segments */
2141 validate_seg(env, R_ES, rpl);
2142 validate_seg(env, R_DS, rpl);
2143 validate_seg(env, R_FS, rpl);
2144 validate_seg(env, R_GS, rpl);
2145
2146 sp += addend;
2147 }
2148 SET_ESP(sp, sp_mask);
2149 env->eip = new_eip;
2150 if (is_iret) {
2151 /* NOTE: 'cpl' is the _old_ CPL */
2152 eflags_mask = TF_MASK | AC_MASK | ID_MASK | RF_MASK | NT_MASK;
2153 if (cpl == 0) {
2154 eflags_mask |= IOPL_MASK;
2155 }
2156 iopl = (env->eflags >> IOPL_SHIFT) & 3;
2157 if (cpl <= iopl) {
2158 eflags_mask |= IF_MASK;
2159 }
2160 if (shift == 0) {
2161 eflags_mask &= 0xffff;
2162 }
2163 cpu_load_eflags(env, new_eflags, eflags_mask);
2164 }
2165 return;
2166
2167 return_to_vm86:
2168 POPL(ssp, sp, sp_mask, new_esp);
2169 POPL(ssp, sp, sp_mask, new_ss);
2170 POPL(ssp, sp, sp_mask, new_es);
2171 POPL(ssp, sp, sp_mask, new_ds);
2172 POPL(ssp, sp, sp_mask, new_fs);
2173 POPL(ssp, sp, sp_mask, new_gs);
2174
2175 /* modify processor state */
2176 cpu_load_eflags(env, new_eflags, TF_MASK | AC_MASK | ID_MASK |
2177 IF_MASK | IOPL_MASK | VM_MASK | NT_MASK | VIF_MASK |
2178 VIP_MASK);
2179 load_seg_vm(env, R_CS, new_cs & 0xffff);
2180 cpu_x86_set_cpl(env, 3);
2181 load_seg_vm(env, R_SS, new_ss & 0xffff);
2182 load_seg_vm(env, R_ES, new_es & 0xffff);
2183 load_seg_vm(env, R_DS, new_ds & 0xffff);
2184 load_seg_vm(env, R_FS, new_fs & 0xffff);
2185 load_seg_vm(env, R_GS, new_gs & 0xffff);
2186
2187 env->eip = new_eip & 0xffff;
2188 env->regs[R_ESP] = new_esp;
2189 }
2190
2191 void helper_iret_protected(CPUX86State *env, int shift, int next_eip)
2192 {
2193 int tss_selector, type;
2194 uint32_t e1, e2;
2195
2196 /* specific case for TSS */
2197 if (env->eflags & NT_MASK) {
2198 #ifdef TARGET_X86_64
2199 if (env->hflags & HF_LMA_MASK) {
2200 raise_exception_err(env, EXCP0D_GPF, 0);
2201 }
2202 #endif
2203 tss_selector = cpu_lduw_kernel(env, env->tr.base + 0);
2204 if (tss_selector & 4) {
2205 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
2206 }
2207 if (load_segment(env, &e1, &e2, tss_selector) != 0) {
2208 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
2209 }
2210 type = (e2 >> DESC_TYPE_SHIFT) & 0x17;
2211 /* NOTE: we check both segment and busy TSS */
2212 if (type != 3) {
2213 raise_exception_err(env, EXCP0A_TSS, tss_selector & 0xfffc);
2214 }
2215 switch_tss(env, tss_selector, e1, e2, SWITCH_TSS_IRET, next_eip);
2216 } else {
2217 helper_ret_protected(env, shift, 1, 0);
2218 }
2219 env->hflags2 &= ~HF2_NMI_MASK;
2220 }
2221
2222 void helper_lret_protected(CPUX86State *env, int shift, int addend)
2223 {
2224 helper_ret_protected(env, shift, 0, addend);
2225 }
2226
2227 void helper_sysenter(CPUX86State *env)
2228 {
2229 if (env->sysenter_cs == 0) {
2230 raise_exception_err(env, EXCP0D_GPF, 0);
2231 }
2232 env->eflags &= ~(VM_MASK | IF_MASK | RF_MASK);
2233 cpu_x86_set_cpl(env, 0);
2234
2235 #ifdef TARGET_X86_64
2236 if (env->hflags & HF_LMA_MASK) {
2237 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
2238 0, 0xffffffff,
2239 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2240 DESC_S_MASK |
2241 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
2242 DESC_L_MASK);
2243 } else
2244 #endif
2245 {
2246 cpu_x86_load_seg_cache(env, R_CS, env->sysenter_cs & 0xfffc,
2247 0, 0xffffffff,
2248 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2249 DESC_S_MASK |
2250 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
2251 }
2252 cpu_x86_load_seg_cache(env, R_SS, (env->sysenter_cs + 8) & 0xfffc,
2253 0, 0xffffffff,
2254 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2255 DESC_S_MASK |
2256 DESC_W_MASK | DESC_A_MASK);
2257 env->regs[R_ESP] = env->sysenter_esp;
2258 env->eip = env->sysenter_eip;
2259 }
2260
2261 void helper_sysexit(CPUX86State *env, int dflag)
2262 {
2263 int cpl;
2264
2265 cpl = env->hflags & HF_CPL_MASK;
2266 if (env->sysenter_cs == 0 || cpl != 0) {
2267 raise_exception_err(env, EXCP0D_GPF, 0);
2268 }
2269 cpu_x86_set_cpl(env, 3);
2270 #ifdef TARGET_X86_64
2271 if (dflag == 2) {
2272 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 32) & 0xfffc) |
2273 3, 0, 0xffffffff,
2274 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2275 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2276 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK |
2277 DESC_L_MASK);
2278 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 40) & 0xfffc) |
2279 3, 0, 0xffffffff,
2280 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2281 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2282 DESC_W_MASK | DESC_A_MASK);
2283 } else
2284 #endif
2285 {
2286 cpu_x86_load_seg_cache(env, R_CS, ((env->sysenter_cs + 16) & 0xfffc) |
2287 3, 0, 0xffffffff,
2288 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2289 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2290 DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK);
2291 cpu_x86_load_seg_cache(env, R_SS, ((env->sysenter_cs + 24) & 0xfffc) |
2292 3, 0, 0xffffffff,
2293 DESC_G_MASK | DESC_B_MASK | DESC_P_MASK |
2294 DESC_S_MASK | (3 << DESC_DPL_SHIFT) |
2295 DESC_W_MASK | DESC_A_MASK);
2296 }
2297 env->regs[R_ESP] = env->regs[R_ECX];
2298 env->eip = env->regs[R_EDX];
2299 }
2300
2301 target_ulong helper_lsl(CPUX86State *env, target_ulong selector1)
2302 {
2303 unsigned int limit;
2304 uint32_t e1, e2, eflags, selector;
2305 int rpl, dpl, cpl, type;
2306
2307 selector = selector1 & 0xffff;
2308 eflags = cpu_cc_compute_all(env, CC_OP);
2309 if ((selector & 0xfffc) == 0) {
2310 goto fail;
2311 }
2312 if (load_segment(env, &e1, &e2, selector) != 0) {
2313 goto fail;
2314 }
2315 rpl = selector & 3;
2316 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2317 cpl = env->hflags & HF_CPL_MASK;
2318 if (e2 & DESC_S_MASK) {
2319 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
2320 /* conforming */
2321 } else {
2322 if (dpl < cpl || dpl < rpl) {
2323 goto fail;
2324 }
2325 }
2326 } else {
2327 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
2328 switch (type) {
2329 case 1:
2330 case 2:
2331 case 3:
2332 case 9:
2333 case 11:
2334 break;
2335 default:
2336 goto fail;
2337 }
2338 if (dpl < cpl || dpl < rpl) {
2339 fail:
2340 CC_SRC = eflags & ~CC_Z;
2341 return 0;
2342 }
2343 }
2344 limit = get_seg_limit(e1, e2);
2345 CC_SRC = eflags | CC_Z;
2346 return limit;
2347 }
2348
2349 target_ulong helper_lar(CPUX86State *env, target_ulong selector1)
2350 {
2351 uint32_t e1, e2, eflags, selector;
2352 int rpl, dpl, cpl, type;
2353
2354 selector = selector1 & 0xffff;
2355 eflags = cpu_cc_compute_all(env, CC_OP);
2356 if ((selector & 0xfffc) == 0) {
2357 goto fail;
2358 }
2359 if (load_segment(env, &e1, &e2, selector) != 0) {
2360 goto fail;
2361 }
2362 rpl = selector & 3;
2363 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2364 cpl = env->hflags & HF_CPL_MASK;
2365 if (e2 & DESC_S_MASK) {
2366 if ((e2 & DESC_CS_MASK) && (e2 & DESC_C_MASK)) {
2367 /* conforming */
2368 } else {
2369 if (dpl < cpl || dpl < rpl) {
2370 goto fail;
2371 }
2372 }
2373 } else {
2374 type = (e2 >> DESC_TYPE_SHIFT) & 0xf;
2375 switch (type) {
2376 case 1:
2377 case 2:
2378 case 3:
2379 case 4:
2380 case 5:
2381 case 9:
2382 case 11:
2383 case 12:
2384 break;
2385 default:
2386 goto fail;
2387 }
2388 if (dpl < cpl || dpl < rpl) {
2389 fail:
2390 CC_SRC = eflags & ~CC_Z;
2391 return 0;
2392 }
2393 }
2394 CC_SRC = eflags | CC_Z;
2395 return e2 & 0x00f0ff00;
2396 }
2397
2398 void helper_verr(CPUX86State *env, target_ulong selector1)
2399 {
2400 uint32_t e1, e2, eflags, selector;
2401 int rpl, dpl, cpl;
2402
2403 selector = selector1 & 0xffff;
2404 eflags = cpu_cc_compute_all(env, CC_OP);
2405 if ((selector & 0xfffc) == 0) {
2406 goto fail;
2407 }
2408 if (load_segment(env, &e1, &e2, selector) != 0) {
2409 goto fail;
2410 }
2411 if (!(e2 & DESC_S_MASK)) {
2412 goto fail;
2413 }
2414 rpl = selector & 3;
2415 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2416 cpl = env->hflags & HF_CPL_MASK;
2417 if (e2 & DESC_CS_MASK) {
2418 if (!(e2 & DESC_R_MASK)) {
2419 goto fail;
2420 }
2421 if (!(e2 & DESC_C_MASK)) {
2422 if (dpl < cpl || dpl < rpl) {
2423 goto fail;
2424 }
2425 }
2426 } else {
2427 if (dpl < cpl || dpl < rpl) {
2428 fail:
2429 CC_SRC = eflags & ~CC_Z;
2430 return;
2431 }
2432 }
2433 CC_SRC = eflags | CC_Z;
2434 }
2435
2436 void helper_verw(CPUX86State *env, target_ulong selector1)
2437 {
2438 uint32_t e1, e2, eflags, selector;
2439 int rpl, dpl, cpl;
2440
2441 selector = selector1 & 0xffff;
2442 eflags = cpu_cc_compute_all(env, CC_OP);
2443 if ((selector & 0xfffc) == 0) {
2444 goto fail;
2445 }
2446 if (load_segment(env, &e1, &e2, selector) != 0) {
2447 goto fail;
2448 }
2449 if (!(e2 & DESC_S_MASK)) {
2450 goto fail;
2451 }
2452 rpl = selector & 3;
2453 dpl = (e2 >> DESC_DPL_SHIFT) & 3;
2454 cpl = env->hflags & HF_CPL_MASK;
2455 if (e2 & DESC_CS_MASK) {
2456 goto fail;
2457 } else {
2458 if (dpl < cpl || dpl < rpl) {
2459 goto fail;
2460 }
2461 if (!(e2 & DESC_W_MASK)) {
2462 fail:
2463 CC_SRC = eflags & ~CC_Z;
2464 return;
2465 }
2466 }
2467 CC_SRC = eflags | CC_Z;
2468 }
2469
2470 #if defined(CONFIG_USER_ONLY)
2471 void cpu_x86_load_seg(CPUX86State *env, int seg_reg, int selector)
2472 {
2473 if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) {
2474 selector &= 0xffff;
2475 cpu_x86_load_seg_cache(env, seg_reg, selector,
2476 (selector << 4), 0xffff, 0);
2477 } else {
2478 helper_load_seg(env, seg_reg, selector);
2479 }
2480 }
2481 #endif
QEmu