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git.proxmox.com Git - qemu.git/blob - target-i386/helper2.c
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\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 for(i
= 0; i
< 6; i
++) {
187 SegmentCache
*sc
= &env
->segs
[i
];
188 fprintf(f
, "%s =%04x %08x %08x %08x\n",
195 fprintf(f
, "LDT=%04x %08x %08x %08x\n",
200 fprintf(f
, "TR =%04x %08x %08x %08x\n",
205 fprintf(f
, "GDT= %08x %08x\n",
206 (int)env
->gdt
.base
, env
->gdt
.limit
);
207 fprintf(f
, "IDT= %08x %08x\n",
208 (int)env
->idt
.base
, env
->idt
.limit
);
209 fprintf(f
, "CR0=%08x CR2=%08x CR3=%08x CR4=%08x\n",
210 env
->cr
[0], env
->cr
[2], env
->cr
[3], env
->cr
[4]);
212 if (flags
& X86_DUMP_CCOP
) {
213 if ((unsigned)env
->cc_op
< CC_OP_NB
)
214 strcpy(cc_op_name
, cc_op_str
[env
->cc_op
]);
216 snprintf(cc_op_name
, sizeof(cc_op_name
), "[%d]", env
->cc_op
);
217 fprintf(f
, "CCS=%08x CCD=%08x CCO=%-8s\n",
218 env
->cc_src
, env
->cc_dst
, cc_op_name
);
220 if (flags
& X86_DUMP_FPU
) {
221 fprintf(f
, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
222 (double)env
->fpregs
[0],
223 (double)env
->fpregs
[1],
224 (double)env
->fpregs
[2],
225 (double)env
->fpregs
[3]);
226 fprintf(f
, "ST4=%f ST5=%f ST6=%f ST7=%f\n",
227 (double)env
->fpregs
[4],
228 (double)env
->fpregs
[5],
229 (double)env
->fpregs
[7],
230 (double)env
->fpregs
[8]);
234 /***********************************************************/
236 /* XXX: add PGE support */
238 void cpu_x86_set_a20(CPUX86State
*env
, int a20_state
)
240 a20_state
= (a20_state
!= 0);
241 if (a20_state
!= ((env
->a20_mask
>> 20) & 1)) {
242 #if defined(DEBUG_MMU)
243 printf("A20 update: a20=%d\n", a20_state
);
245 /* if the cpu is currently executing code, we must unlink it and
246 all the potentially executing TB */
247 cpu_interrupt(env
, CPU_INTERRUPT_EXITTB
);
249 /* when a20 is changed, all the MMU mappings are invalid, so
250 we must flush everything */
252 env
->a20_mask
= 0xffefffff | (a20_state
<< 20);
256 void cpu_x86_update_cr0(CPUX86State
*env
, uint32_t new_cr0
)
260 #if defined(DEBUG_MMU)
261 printf("CR0 update: CR0=0x%08x\n", new_cr0
);
263 if ((new_cr0
& (CR0_PG_MASK
| CR0_WP_MASK
| CR0_PE_MASK
)) !=
264 (env
->cr
[0] & (CR0_PG_MASK
| CR0_WP_MASK
| CR0_PE_MASK
))) {
267 env
->cr
[0] = new_cr0
;
269 /* update PE flag in hidden flags */
270 pe_state
= (env
->cr
[0] & CR0_PE_MASK
);
271 env
->hflags
= (env
->hflags
& ~HF_PE_MASK
) | (pe_state
<< HF_PE_SHIFT
);
272 /* ensure that ADDSEG is always set in real mode */
273 env
->hflags
|= ((pe_state
^ 1) << HF_ADDSEG_SHIFT
);
274 /* update FPU flags */
275 env
->hflags
= (env
->hflags
& ~(HF_MP_MASK
| HF_EM_MASK
| HF_TS_MASK
)) |
276 ((new_cr0
<< (HF_MP_SHIFT
- 1)) & (HF_MP_MASK
| HF_EM_MASK
| HF_TS_MASK
));
279 void cpu_x86_update_cr3(CPUX86State
*env
, uint32_t new_cr3
)
281 env
->cr
[3] = new_cr3
;
282 if (env
->cr
[0] & CR0_PG_MASK
) {
283 #if defined(DEBUG_MMU)
284 printf("CR3 update: CR3=%08x\n", new_cr3
);
290 void cpu_x86_update_cr4(CPUX86State
*env
, uint32_t new_cr4
)
292 #if defined(DEBUG_MMU)
293 printf("CR4 update: CR4=%08x\n", env
->cr
[4]);
295 if ((new_cr4
& (CR4_PGE_MASK
| CR4_PAE_MASK
| CR4_PSE_MASK
)) !=
296 (env
->cr
[4] & (CR4_PGE_MASK
| CR4_PAE_MASK
| CR4_PSE_MASK
))) {
299 env
->cr
[4] = new_cr4
;
302 /* XXX: also flush 4MB pages */
303 void cpu_x86_flush_tlb(CPUX86State
*env
, uint32_t addr
)
305 tlb_flush_page(env
, addr
);
309 -1 = cannot handle fault
310 0 = nothing more to do
311 1 = generate PF fault
312 2 = soft MMU activation required for this block
314 int cpu_x86_handle_mmu_fault(CPUX86State
*env
, uint32_t addr
,
315 int is_write
, int is_user
, int is_softmmu
)
317 uint8_t *pde_ptr
, *pte_ptr
;
318 uint32_t pde
, pte
, virt_addr
, ptep
;
319 int error_code
, is_dirty
, prot
, page_size
, ret
;
320 unsigned long paddr
, vaddr
, page_offset
;
322 #if defined(DEBUG_MMU)
323 printf("MMU fault: addr=0x%08x w=%d u=%d eip=%08x\n",
324 addr
, is_write
, is_user
, env
->eip
);
327 if (env
->user_mode_only
) {
328 /* user mode only emulation */
333 if (!(env
->cr
[0] & CR0_PG_MASK
)) {
335 virt_addr
= addr
& TARGET_PAGE_MASK
;
336 prot
= PAGE_READ
| PAGE_WRITE
;
341 /* page directory entry */
342 pde_ptr
= phys_ram_base
+
343 (((env
->cr
[3] & ~0xfff) + ((addr
>> 20) & ~3)) & env
->a20_mask
);
344 pde
= ldl_raw(pde_ptr
);
345 if (!(pde
& PG_PRESENT_MASK
)) {
349 /* if PSE bit is set, then we use a 4MB page */
350 if ((pde
& PG_PSE_MASK
) && (env
->cr
[4] & CR4_PSE_MASK
)) {
352 if (!(pde
& PG_USER_MASK
))
353 goto do_fault_protect
;
354 if (is_write
&& !(pde
& PG_RW_MASK
))
355 goto do_fault_protect
;
357 if ((env
->cr
[0] & CR0_WP_MASK
) &&
358 is_write
&& !(pde
& PG_RW_MASK
))
359 goto do_fault_protect
;
361 is_dirty
= is_write
&& !(pde
& PG_DIRTY_MASK
);
362 if (!(pde
& PG_ACCESSED_MASK
) || is_dirty
) {
363 pde
|= PG_ACCESSED_MASK
;
365 pde
|= PG_DIRTY_MASK
;
366 stl_raw(pde_ptr
, pde
);
369 pte
= pde
& ~0x003ff000; /* align to 4MB */
371 page_size
= 4096 * 1024;
372 virt_addr
= addr
& ~0x003fffff;
374 if (!(pde
& PG_ACCESSED_MASK
)) {
375 pde
|= PG_ACCESSED_MASK
;
376 stl_raw(pde_ptr
, pde
);
379 /* page directory entry */
380 pte_ptr
= phys_ram_base
+
381 (((pde
& ~0xfff) + ((addr
>> 10) & 0xffc)) & env
->a20_mask
);
382 pte
= ldl_raw(pte_ptr
);
383 if (!(pte
& PG_PRESENT_MASK
)) {
387 /* combine pde and pte user and rw protections */
390 if (!(ptep
& PG_USER_MASK
))
391 goto do_fault_protect
;
392 if (is_write
&& !(ptep
& PG_RW_MASK
))
393 goto do_fault_protect
;
395 if ((env
->cr
[0] & CR0_WP_MASK
) &&
396 is_write
&& !(ptep
& PG_RW_MASK
))
397 goto do_fault_protect
;
399 is_dirty
= is_write
&& !(pte
& PG_DIRTY_MASK
);
400 if (!(pte
& PG_ACCESSED_MASK
) || is_dirty
) {
401 pte
|= PG_ACCESSED_MASK
;
403 pte
|= PG_DIRTY_MASK
;
404 stl_raw(pte_ptr
, pte
);
407 virt_addr
= addr
& ~0xfff;
410 /* the page can be put in the TLB */
412 if (pte
& PG_DIRTY_MASK
) {
413 /* only set write access if already dirty... otherwise wait
416 if (ptep
& PG_RW_MASK
)
419 if (!(env
->cr
[0] & CR0_WP_MASK
) ||
426 pte
= pte
& env
->a20_mask
;
428 /* Even if 4MB pages, we map only one 4KB page in the cache to
429 avoid filling it too fast */
430 page_offset
= (addr
& TARGET_PAGE_MASK
) & (page_size
- 1);
431 paddr
= (pte
& TARGET_PAGE_MASK
) + page_offset
;
432 vaddr
= virt_addr
+ page_offset
;
434 ret
= tlb_set_page(env
, vaddr
, paddr
, prot
, is_user
, is_softmmu
);
437 error_code
= PG_ERROR_P_MASK
;
440 env
->error_code
= (is_write
<< PG_ERROR_W_BIT
) | error_code
;
442 env
->error_code
|= PG_ERROR_U_MASK
;
446 #if defined(CONFIG_USER_ONLY)
447 target_ulong
cpu_get_phys_page_debug(CPUState
*env
, target_ulong addr
)
452 target_ulong
cpu_get_phys_page_debug(CPUState
*env
, target_ulong addr
)
454 uint8_t *pde_ptr
, *pte_ptr
;
455 uint32_t pde
, pte
, paddr
, page_offset
, page_size
;
457 if (!(env
->cr
[0] & CR0_PG_MASK
)) {
461 /* page directory entry */
462 pde_ptr
= phys_ram_base
+
463 (((env
->cr
[3] & ~0xfff) + ((addr
>> 20) & ~3)) & env
->a20_mask
);
464 pde
= ldl_raw(pde_ptr
);
465 if (!(pde
& PG_PRESENT_MASK
))
467 if ((pde
& PG_PSE_MASK
) && (env
->cr
[4] & CR4_PSE_MASK
)) {
468 pte
= pde
& ~0x003ff000; /* align to 4MB */
469 page_size
= 4096 * 1024;
471 /* page directory entry */
472 pte_ptr
= phys_ram_base
+
473 (((pde
& ~0xfff) + ((addr
>> 10) & 0xffc)) & env
->a20_mask
);
474 pte
= ldl_raw(pte_ptr
);
475 if (!(pte
& PG_PRESENT_MASK
))
480 pte
= pte
& env
->a20_mask
;
481 page_offset
= (addr
& TARGET_PAGE_MASK
) & (page_size
- 1);
482 paddr
= (pte
& TARGET_PAGE_MASK
) + page_offset
;
487 #if defined(USE_CODE_COPY)
500 uint8_t fpregs1
[8 * 10];
503 void restore_native_fp_state(CPUState
*env
)
506 struct fpstate fp1
, *fp
= &fp1
;
508 fp
->fpuc
= env
->fpuc
;
509 fp
->fpus
= (env
->fpus
& ~0x3800) | (env
->fpstt
& 0x7) << 11;
511 for (i
=7; i
>=0; i
--) {
513 if (env
->fptags
[i
]) {
516 /* the FPU automatically computes it */
521 for(i
= 0;i
< 8; i
++) {
522 memcpy(&fp
->fpregs1
[i
* 10], &env
->fpregs
[j
], 10);
525 asm volatile ("frstor %0" : "=m" (*fp
));
526 env
->native_fp_regs
= 1;
529 void save_native_fp_state(CPUState
*env
)
533 struct fpstate fp1
, *fp
= &fp1
;
535 asm volatile ("fsave %0" : : "m" (*fp
));
536 env
->fpuc
= fp
->fpuc
;
537 env
->fpstt
= (fp
->fpus
>> 11) & 7;
538 env
->fpus
= fp
->fpus
& ~0x3800;
540 for(i
= 0;i
< 8; i
++) {
541 env
->fptags
[i
] = ((fptag
& 3) == 3);
545 for(i
= 0;i
< 8; i
++) {
546 memcpy(&env
->fpregs
[j
], &fp
->fpregs1
[i
* 10], 10);
549 /* we must restore the default rounding state */
550 /* XXX: we do not restore the exception state */
551 fpuc
= 0x037f | (env
->fpuc
& (3 << 10));
552 asm volatile("fldcw %0" : : "m" (fpuc
));
553 env
->native_fp_regs
= 0;