2 * i386 helpers (without register variable usage)
4 * Copyright (c) 2003 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
35 #include <linux/unistd.h>
36 #include <linux/version.h>
38 _syscall3(int, modify_ldt, int, func, void *, ptr, unsigned long, bytecount)
40 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 66)
41 #define modify_ldt_ldt_s user_desc
43 #endif /* USE_CODE_COPY */
45 CPUX86State *cpu_x86_init(void)
53 env = malloc(sizeof(CPUX86State));
56 memset(env, 0, sizeof(CPUX86State));
58 /* init to reset state */
62 env->hflags |= HF_SOFTMMU_MASK;
65 cpu_x86_update_cr0(env, 0x60000010);
66 env->a20_mask = 0xffffffff;
68 env->idt.limit = 0xffff;
69 env->gdt.limit = 0xffff;
70 env->ldt.limit = 0xffff;
71 env->ldt.flags = DESC_P_MASK;
72 env->tr.limit = 0xffff;
73 env->tr.flags = DESC_P_MASK;
75 /* not correct (CS base=0xffff0000) */
76 cpu_x86_load_seg_cache(env, R_CS, 0xf000, (uint8_t *)0x000f0000, 0xffff, 0);
77 cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0xffff, 0);
78 cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0xffff, 0);
79 cpu_x86_load_seg_cache(env, R_SS, 0, NULL, 0xffff, 0);
80 cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0xffff, 0);
81 cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0xffff, 0);
84 env->regs[R_EDX] = 0x600; /* indicate P6 processor */
93 /* init various static tables */
96 optimize_flags_init();
99 /* testing code for code copy case */
101 struct modify_ldt_ldt_s ldt;
103 ldt.entry_number = 1;
104 ldt.base_addr = (unsigned long)env;
105 ldt.limit = (sizeof(CPUState) + 0xfff) >> 12;
107 ldt.contents = MODIFY_LDT_CONTENTS_DATA;
108 ldt.read_exec_only = 0;
109 ldt.limit_in_pages = 1;
110 ldt.seg_not_present = 0;
112 modify_ldt(1, &ldt, sizeof(ldt)); /* write ldt entry */
114 asm volatile ("movl %0, %%fs" : : "r" ((1 << 3) | 7));
115 cpu_single_env = env;
121 void cpu_x86_close(CPUX86State *env)
126 /***********************************************************/
129 static const char *cc_op_str[] = {
164 void cpu_x86_dump_state(CPUX86State *env, FILE *f, int flags)
168 static const char *seg_name[6] = { "ES", "CS", "SS", "DS", "FS", "GS" };
170 eflags = env->eflags;
171 fprintf(f, "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
172 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
173 "EIP=%08x EFL=%08x [%c%c%c%c%c%c%c] CPL=%d II=%d A20=%d\n",
174 env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX],
175 env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP],
177 eflags & DF_MASK ? 'D' : '-',
178 eflags & CC_O ? 'O' : '-',
179 eflags & CC_S ? 'S' : '-',
180 eflags & CC_Z ? 'Z' : '-',
181 eflags & CC_A ? 'A' : '-',
182 eflags & CC_P ? 'P' : '-',
183 eflags & CC_C ? 'C' : '-',
184 env->hflags & HF_CPL_MASK,
185 (env->hflags >> HF_INHIBIT_IRQ_SHIFT) & 1,
186 (env->a20_mask >> 20) & 1);
187 for(i = 0; i < 6; i++) {
188 SegmentCache *sc = &env->segs[i];
189 fprintf(f, "%s =%04x %08x %08x %08x\n",
196 fprintf(f, "LDT=%04x %08x %08x %08x\n",
201 fprintf(f, "TR =%04x %08x %08x %08x\n",
206 fprintf(f, "GDT= %08x %08x\n",
207 (int)env->gdt.base, env->gdt.limit);
208 fprintf(f, "IDT= %08x %08x\n",
209 (int)env->idt.base, env->idt.limit);
210 fprintf(f, "CR0=%08x CR2=%08x CR3=%08x CR4=%08x\n",
211 env->cr[0], env->cr[2], env->cr[3], env->cr[4]);
213 if (flags & X86_DUMP_CCOP) {
214 if ((unsigned)env->cc_op < CC_OP_NB)
215 strcpy(cc_op_name, cc_op_str[env->cc_op]);
217 snprintf(cc_op_name, sizeof(cc_op_name), "[%d]", env->cc_op);
218 fprintf(f, "CCS=%08x CCD=%08x CCO=%-8s\n",
219 env->cc_src, env->cc_dst, cc_op_name);
221 if (flags & X86_DUMP_FPU) {
222 fprintf(f, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
223 (double)env->fpregs[0],
224 (double)env->fpregs[1],
225 (double)env->fpregs[2],
226 (double)env->fpregs[3]);
227 fprintf(f, "ST4=%f ST5=%f ST6=%f ST7=%f\n",
228 (double)env->fpregs[4],
229 (double)env->fpregs[5],
230 (double)env->fpregs[7],
231 (double)env->fpregs[8]);
235 /***********************************************************/
237 /* XXX: add PGE support */
239 void cpu_x86_set_a20(CPUX86State *env, int a20_state)
241 a20_state = (a20_state != 0);
242 if (a20_state != ((env->a20_mask >> 20) & 1)) {
243 #if defined(DEBUG_MMU)
244 printf("A20 update: a20=%d\n", a20_state);
246 /* if the cpu is currently executing code, we must unlink it and
247 all the potentially executing TB */
248 cpu_interrupt(env, CPU_INTERRUPT_EXITTB);
250 /* when a20 is changed, all the MMU mappings are invalid, so
251 we must flush everything */
253 env->a20_mask = 0xffefffff | (a20_state << 20);
257 void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0)
261 #if defined(DEBUG_MMU)
262 printf("CR0 update: CR0=0x%08x\n", new_cr0);
264 if ((new_cr0 & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK)) !=
265 (env->cr[0] & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK))) {
268 env->cr[0] = new_cr0 | CR0_ET_MASK;
270 /* update PE flag in hidden flags */
271 pe_state = (env->cr[0] & CR0_PE_MASK);
272 env->hflags = (env->hflags & ~HF_PE_MASK) | (pe_state << HF_PE_SHIFT);
273 /* ensure that ADDSEG is always set in real mode */
274 env->hflags |= ((pe_state ^ 1) << HF_ADDSEG_SHIFT);
275 /* update FPU flags */
276 env->hflags = (env->hflags & ~(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK)) |
277 ((new_cr0 << (HF_MP_SHIFT - 1)) & (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK));
280 void cpu_x86_update_cr3(CPUX86State *env, uint32_t new_cr3)
282 env->cr[3] = new_cr3;
283 if (env->cr[0] & CR0_PG_MASK) {
284 #if defined(DEBUG_MMU)
285 printf("CR3 update: CR3=%08x\n", new_cr3);
291 void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4)
293 #if defined(DEBUG_MMU)
294 printf("CR4 update: CR4=%08x\n", env->cr[4]);
296 if ((new_cr4 & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK)) !=
297 (env->cr[4] & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK))) {
300 env->cr[4] = new_cr4;
303 /* XXX: also flush 4MB pages */
304 void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr)
306 tlb_flush_page(env, addr);
310 -1 = cannot handle fault
311 0 = nothing more to do
312 1 = generate PF fault
313 2 = soft MMU activation required for this block
315 int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr,
316 int is_write, int is_user, int is_softmmu)
318 uint8_t *pde_ptr, *pte_ptr;
319 uint32_t pde, pte, virt_addr, ptep;
320 int error_code, is_dirty, prot, page_size, ret;
321 unsigned long paddr, vaddr, page_offset;
323 #if defined(DEBUG_MMU)
324 printf("MMU fault: addr=0x%08x w=%d u=%d eip=%08x\n",
325 addr, is_write, is_user, env->eip);
328 if (env->user_mode_only) {
329 /* user mode only emulation */
334 if (!(env->cr[0] & CR0_PG_MASK)) {
336 virt_addr = addr & TARGET_PAGE_MASK;
337 prot = PAGE_READ | PAGE_WRITE;
342 /* page directory entry */
343 pde_ptr = phys_ram_base +
344 (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask);
345 pde = ldl_raw(pde_ptr);
346 if (!(pde & PG_PRESENT_MASK)) {
350 /* if PSE bit is set, then we use a 4MB page */
351 if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) {
353 if (!(pde & PG_USER_MASK))
354 goto do_fault_protect;
355 if (is_write && !(pde & PG_RW_MASK))
356 goto do_fault_protect;
358 if ((env->cr[0] & CR0_WP_MASK) &&
359 is_write && !(pde & PG_RW_MASK))
360 goto do_fault_protect;
362 is_dirty = is_write && !(pde & PG_DIRTY_MASK);
363 if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
364 pde |= PG_ACCESSED_MASK;
366 pde |= PG_DIRTY_MASK;
367 stl_raw(pde_ptr, pde);
370 pte = pde & ~0x003ff000; /* align to 4MB */
372 page_size = 4096 * 1024;
373 virt_addr = addr & ~0x003fffff;
375 if (!(pde & PG_ACCESSED_MASK)) {
376 pde |= PG_ACCESSED_MASK;
377 stl_raw(pde_ptr, pde);
380 /* page directory entry */
381 pte_ptr = phys_ram_base +
382 (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask);
383 pte = ldl_raw(pte_ptr);
384 if (!(pte & PG_PRESENT_MASK)) {
388 /* combine pde and pte user and rw protections */
391 if (!(ptep & PG_USER_MASK))
392 goto do_fault_protect;
393 if (is_write && !(ptep & PG_RW_MASK))
394 goto do_fault_protect;
396 if ((env->cr[0] & CR0_WP_MASK) &&
397 is_write && !(ptep & PG_RW_MASK))
398 goto do_fault_protect;
400 is_dirty = is_write && !(pte & PG_DIRTY_MASK);
401 if (!(pte & PG_ACCESSED_MASK) || is_dirty) {
402 pte |= PG_ACCESSED_MASK;
404 pte |= PG_DIRTY_MASK;
405 stl_raw(pte_ptr, pte);
408 virt_addr = addr & ~0xfff;
411 /* the page can be put in the TLB */
413 if (pte & PG_DIRTY_MASK) {
414 /* only set write access if already dirty... otherwise wait
417 if (ptep & PG_RW_MASK)
420 if (!(env->cr[0] & CR0_WP_MASK) ||
427 pte = pte & env->a20_mask;
429 /* Even if 4MB pages, we map only one 4KB page in the cache to
430 avoid filling it too fast */
431 page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
432 paddr = (pte & TARGET_PAGE_MASK) + page_offset;
433 vaddr = virt_addr + page_offset;
435 ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu);
438 error_code = PG_ERROR_P_MASK;
441 env->error_code = (is_write << PG_ERROR_W_BIT) | error_code;
443 env->error_code |= PG_ERROR_U_MASK;
447 #if defined(CONFIG_USER_ONLY)
448 target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
453 target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
455 uint8_t *pde_ptr, *pte_ptr;
456 uint32_t pde, pte, paddr, page_offset, page_size;
458 if (!(env->cr[0] & CR0_PG_MASK)) {
462 /* page directory entry */
463 pde_ptr = phys_ram_base +
464 (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask);
465 pde = ldl_raw(pde_ptr);
466 if (!(pde & PG_PRESENT_MASK))
468 if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) {
469 pte = pde & ~0x003ff000; /* align to 4MB */
470 page_size = 4096 * 1024;
472 /* page directory entry */
473 pte_ptr = phys_ram_base +
474 (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask);
475 pte = ldl_raw(pte_ptr);
476 if (!(pte & PG_PRESENT_MASK))
481 pte = pte & env->a20_mask;
482 page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
483 paddr = (pte & TARGET_PAGE_MASK) + page_offset;
488 #if defined(USE_CODE_COPY)
501 uint8_t fpregs1[8 * 10];
504 void restore_native_fp_state(CPUState *env)
507 struct fpstate fp1, *fp = &fp1;
509 fp->fpuc = env->fpuc;
510 fp->fpus = (env->fpus & ~0x3800) | (env->fpstt & 0x7) << 11;
512 for (i=7; i>=0; i--) {
514 if (env->fptags[i]) {
517 /* the FPU automatically computes it */
522 for(i = 0;i < 8; i++) {
523 memcpy(&fp->fpregs1[i * 10], &env->fpregs[j], 10);
526 asm volatile ("frstor %0" : "=m" (*fp));
527 env->native_fp_regs = 1;
530 void save_native_fp_state(CPUState *env)
534 struct fpstate fp1, *fp = &fp1;
536 asm volatile ("fsave %0" : : "m" (*fp));
537 env->fpuc = fp->fpuc;
538 env->fpstt = (fp->fpus >> 11) & 7;
539 env->fpus = fp->fpus & ~0x3800;
541 for(i = 0;i < 8; i++) {
542 env->fptags[i] = ((fptag & 3) == 3);
546 for(i = 0;i < 8; i++) {
547 memcpy(&env->fpregs[j], &fp->fpregs1[i * 10], 10);
550 /* we must restore the default rounding state */
551 /* XXX: we do not restore the exception state */
552 fpuc = 0x037f | (env->fpuc & (3 << 10));
553 asm volatile("fldcw %0" : : "m" (fpuc));
554 env->native_fp_regs = 0;