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2 * i386 emulator main execution loop
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
22 #include "exec-i386.h"
31 //#define DEBUG_SIGNAL
33 #if defined(TARGET_ARM)
34 /* XXX: unify with i386 target */
35 void cpu_loop_exit(void)
37 longjmp(env
->jmp_env
, 1);
41 /* main execution loop */
43 int cpu_exec(CPUState
*env1
)
45 int saved_T0
, saved_T1
, saved_T2
;
74 int code_gen_size
, ret
, interrupt_request
;
75 void (*gen_func
)(void);
76 TranslationBlock
*tb
, **ptb
;
77 uint8_t *tc_ptr
, *cs_base
, *pc
;
80 /* first we save global registers */
87 /* we also save i7 because longjmp may not restore it */
88 asm volatile ("mov %%i7, %0" : "=r" (saved_i7
));
91 #if defined(TARGET_I386)
94 EAX
= env
->regs
[R_EAX
];
98 ECX
= env
->regs
[R_ECX
];
102 EDX
= env
->regs
[R_EDX
];
106 EBX
= env
->regs
[R_EBX
];
110 ESP
= env
->regs
[R_ESP
];
114 EBP
= env
->regs
[R_EBP
];
118 ESI
= env
->regs
[R_ESI
];
122 EDI
= env
->regs
[R_EDI
];
125 /* put eflags in CPU temporary format */
126 CC_SRC
= env
->eflags
& (CC_O
| CC_S
| CC_Z
| CC_A
| CC_P
| CC_C
);
127 DF
= 1 - (2 * ((env
->eflags
>> 10) & 1));
128 CC_OP
= CC_OP_EFLAGS
;
129 env
->eflags
&= ~(DF_MASK
| CC_O
| CC_S
| CC_Z
| CC_A
| CC_P
| CC_C
);
130 #elif defined(TARGET_ARM)
134 env
->CF
= (psr
>> 29) & 1;
135 env
->NZF
= (psr
& 0xc0000000) ^ 0x40000000;
136 env
->VF
= (psr
<< 3) & 0x80000000;
137 env
->cpsr
= psr
& ~0xf0000000;
140 #error unsupported target CPU
142 env
->exception_index
= -1;
144 /* prepare setjmp context for exception handling */
146 if (setjmp(env
->jmp_env
) == 0) {
147 /* if an exception is pending, we execute it here */
148 if (env
->exception_index
>= 0) {
149 if (env
->exception_index
>= EXCP_INTERRUPT
) {
150 /* exit request from the cpu execution loop */
151 ret
= env
->exception_index
;
153 } else if (env
->user_mode_only
) {
154 /* if user mode only, we simulate a fake exception
155 which will be hanlded outside the cpu execution
157 #if defined(TARGET_I386)
158 do_interrupt_user(env
->exception_index
,
159 env
->exception_is_int
,
161 env
->exception_next_eip
);
163 ret
= env
->exception_index
;
166 #if defined(TARGET_I386)
167 /* simulate a real cpu exception. On i386, it can
168 trigger new exceptions, but we do not handle
169 double or triple faults yet. */
170 do_interrupt(env
->exception_index
,
171 env
->exception_is_int
,
173 env
->exception_next_eip
);
176 env
->exception_index
= -1;
178 T0
= 0; /* force lookup of first TB */
181 /* g1 can be modified by some libc? functions */
184 interrupt_request
= env
->interrupt_request
;
185 if (interrupt_request
) {
186 #if defined(TARGET_I386)
187 /* if hardware interrupt pending, we execute it */
188 if ((interrupt_request
& CPU_INTERRUPT_HARD
) &&
189 (env
->eflags
& IF_MASK
)) {
191 intno
= cpu_x86_get_pic_interrupt(env
);
193 fprintf(logfile
, "Servicing hardware INT=0x%02x\n", intno
);
195 do_interrupt(intno
, 0, 0, 0);
196 env
->interrupt_request
&= ~CPU_INTERRUPT_HARD
;
197 /* ensure that no TB jump will be modified as
198 the program flow was changed */
206 if (interrupt_request
& CPU_INTERRUPT_EXIT
) {
207 env
->interrupt_request
&= ~CPU_INTERRUPT_EXIT
;
208 env
->exception_index
= EXCP_INTERRUPT
;
214 #if defined(TARGET_I386)
215 /* restore flags in standard format */
216 env
->regs
[R_EAX
] = EAX
;
217 env
->regs
[R_EBX
] = EBX
;
218 env
->regs
[R_ECX
] = ECX
;
219 env
->regs
[R_EDX
] = EDX
;
220 env
->regs
[R_ESI
] = ESI
;
221 env
->regs
[R_EDI
] = EDI
;
222 env
->regs
[R_EBP
] = EBP
;
223 env
->regs
[R_ESP
] = ESP
;
224 env
->eflags
= env
->eflags
| cc_table
[CC_OP
].compute_all() | (DF
& DF_MASK
);
225 cpu_x86_dump_state(env
, logfile
, X86_DUMP_CCOP
);
226 env
->eflags
&= ~(DF_MASK
| CC_O
| CC_S
| CC_Z
| CC_A
| CC_P
| CC_C
);
227 #elif defined(TARGET_ARM)
228 env
->cpsr
= compute_cpsr();
229 cpu_arm_dump_state(env
, logfile
, 0);
230 env
->cpsr
&= ~0xf0000000;
232 #error unsupported target CPU
236 /* we compute the CPU state. We assume it will not
237 change during the whole generated block. */
238 #if defined(TARGET_I386)
239 flags
= (env
->segs
[R_CS
].flags
& DESC_B_MASK
)
240 >> (DESC_B_SHIFT
- GEN_FLAG_CODE32_SHIFT
);
241 flags
|= (env
->segs
[R_SS
].flags
& DESC_B_MASK
)
242 >> (DESC_B_SHIFT
- GEN_FLAG_SS32_SHIFT
);
243 flags
|= (((unsigned long)env
->segs
[R_DS
].base
|
244 (unsigned long)env
->segs
[R_ES
].base
|
245 (unsigned long)env
->segs
[R_SS
].base
) != 0) <<
246 GEN_FLAG_ADDSEG_SHIFT
;
247 if (!(env
->eflags
& VM_MASK
)) {
248 flags
|= (env
->segs
[R_CS
].selector
& 3) << GEN_FLAG_CPL_SHIFT
;
250 /* NOTE: a dummy CPL is kept */
251 flags
|= (1 << GEN_FLAG_VM_SHIFT
);
252 flags
|= (3 << GEN_FLAG_CPL_SHIFT
);
254 flags
|= (env
->eflags
& (IOPL_MASK
| TF_MASK
));
255 cs_base
= env
->segs
[R_CS
].base
;
256 pc
= cs_base
+ env
->eip
;
257 #elif defined(TARGET_ARM)
260 pc
= (uint8_t *)env
->regs
[15];
262 #error unsupported CPU
264 tb
= tb_find(&ptb
, (unsigned long)pc
, (unsigned long)cs_base
,
268 /* if no translated code available, then translate it now */
269 tb
= tb_alloc((unsigned long)pc
);
271 /* flush must be done */
273 /* cannot fail at this point */
274 tb
= tb_alloc((unsigned long)pc
);
275 /* don't forget to invalidate previous TB info */
276 ptb
= &tb_hash
[tb_hash_func((unsigned long)pc
)];
279 tc_ptr
= code_gen_ptr
;
281 tb
->cs_base
= (unsigned long)cs_base
;
283 ret
= cpu_gen_code(tb
, CODE_GEN_MAX_SIZE
, &code_gen_size
);
284 #if defined(TARGET_I386)
285 /* XXX: suppress that, this is incorrect */
286 /* if invalid instruction, signal it */
288 /* NOTE: the tb is allocated but not linked, so we
290 spin_unlock(&tb_lock
);
291 raise_exception(EXCP06_ILLOP
);
295 tb
->hash_next
= NULL
;
297 code_gen_ptr
= (void *)(((unsigned long)code_gen_ptr
+ code_gen_size
+ CODE_GEN_ALIGN
- 1) & ~(CODE_GEN_ALIGN
- 1));
298 spin_unlock(&tb_lock
);
302 fprintf(logfile
, "Trace 0x%08lx [0x%08lx] %s\n",
303 (long)tb
->tc_ptr
, (long)tb
->pc
,
304 lookup_symbol((void *)tb
->pc
));
310 /* see if we can patch the calling TB. XXX: remove TF test */
312 #if defined(TARGET_I386)
313 && !(env
->eflags
& TF_MASK
)
317 tb_add_jump((TranslationBlock
*)(T0
& ~3), T0
& 3, tb
);
318 spin_unlock(&tb_lock
);
321 env
->current_tb
= tb
;
322 /* execute the generated code */
323 gen_func
= (void *)tc_ptr
;
324 #if defined(__sparc__)
325 __asm__
__volatile__("call %0\n\t"
329 : "i0", "i1", "i2", "i3", "i4", "i5");
330 #elif defined(__arm__)
331 asm volatile ("mov pc, %0\n\t"
332 ".global exec_loop\n\t"
336 : "r1", "r2", "r3", "r8", "r9", "r10", "r12", "r14");
340 env
->current_tb
= NULL
;
347 #if defined(TARGET_I386)
348 /* restore flags in standard format */
349 env
->eflags
= env
->eflags
| cc_table
[CC_OP
].compute_all() | (DF
& DF_MASK
);
351 /* restore global registers */
376 #elif defined(TARGET_ARM)
377 env
->cpsr
= compute_cpsr();
379 #error unsupported target CPU
382 asm volatile ("mov %0, %%i7" : : "r" (saved_i7
));
391 #if defined(TARGET_I386)
393 void cpu_x86_load_seg(CPUX86State
*s
, int seg_reg
, int selector
)
395 CPUX86State
*saved_env
;
399 if (env
->eflags
& VM_MASK
) {
402 sc
= &env
->segs
[seg_reg
];
403 /* NOTE: in VM86 mode, limit and flags are never reloaded,
404 so we must load them here */
405 sc
->base
= (void *)(selector
<< 4);
408 sc
->selector
= selector
;
410 load_seg(seg_reg
, selector
, 0);
415 void cpu_x86_fsave(CPUX86State
*s
, uint8_t *ptr
, int data32
)
417 CPUX86State
*saved_env
;
422 helper_fsave(ptr
, data32
);
427 void cpu_x86_frstor(CPUX86State
*s
, uint8_t *ptr
, int data32
)
429 CPUX86State
*saved_env
;
434 helper_frstor(ptr
, data32
);
439 #endif /* TARGET_I386 */
451 #include <sys/ucontext.h>
453 #if defined(TARGET_I386)
455 /* 'pc' is the host PC at which the exception was raised. 'address' is
456 the effective address of the memory exception. 'is_write' is 1 if a
457 write caused the exception and otherwise 0'. 'old_set' is the
458 signal set which should be restored */
459 static inline int handle_cpu_signal(unsigned long pc
, unsigned long address
,
460 int is_write
, sigset_t
*old_set
)
462 TranslationBlock
*tb
;
466 env
= cpu_single_env
; /* XXX: find a correct solution for multithread */
467 #if defined(DEBUG_SIGNAL)
468 printf("qemu: SIGSEGV pc=0x%08lx address=%08lx w=%d oldset=0x%08lx\n",
469 pc
, address
, is_write
, *(unsigned long *)old_set
);
471 /* XXX: locking issue */
472 if (is_write
&& page_unprotect(address
)) {
475 /* see if it is an MMU fault */
476 ret
= cpu_x86_handle_mmu_fault(env
, address
, is_write
);
478 return 0; /* not an MMU fault */
480 return 1; /* the MMU fault was handled without causing real CPU fault */
481 /* now we have a real cpu fault */
484 /* the PC is inside the translated code. It means that we have
485 a virtual CPU fault */
486 cpu_restore_state(tb
, env
, pc
);
489 printf("PF exception: EIP=0x%08x CR2=0x%08x error=0x%x\n",
490 env
->eip
, env
->cr
[2], env
->error_code
);
492 /* we restore the process signal mask as the sigreturn should
493 do it (XXX: use sigsetjmp) */
494 sigprocmask(SIG_SETMASK
, old_set
, NULL
);
495 raise_exception_err(EXCP0E_PAGE
, env
->error_code
);
496 /* never comes here */
500 #elif defined(TARGET_ARM)
501 static inline int handle_cpu_signal(unsigned long pc
, unsigned long address
,
502 int is_write
, sigset_t
*old_set
)
508 #error unsupported target CPU
511 #if defined(__i386__)
513 int cpu_signal_handler(int host_signum
, struct siginfo
*info
,
516 struct ucontext
*uc
= puc
;
523 #define REG_TRAPNO TRAPNO
525 pc
= uc
->uc_mcontext
.gregs
[REG_EIP
];
526 return handle_cpu_signal(pc
, (unsigned long)info
->si_addr
,
527 uc
->uc_mcontext
.gregs
[REG_TRAPNO
] == 0xe ?
528 (uc
->uc_mcontext
.gregs
[REG_ERR
] >> 1) & 1 : 0,
532 #elif defined(__powerpc)
534 int cpu_signal_handler(int host_signum
, struct siginfo
*info
,
537 struct ucontext
*uc
= puc
;
538 struct pt_regs
*regs
= uc
->uc_mcontext
.regs
;
546 if (regs
->dsisr
& 0x00800000)
549 if (regs
->trap
!= 0x400 && (regs
->dsisr
& 0x02000000))
552 return handle_cpu_signal(pc
, (unsigned long)info
->si_addr
,
553 is_write
, &uc
->uc_sigmask
);
556 #elif defined(__alpha__)
558 int cpu_signal_handler(int host_signum
, struct siginfo
*info
,
561 struct ucontext
*uc
= puc
;
562 uint32_t *pc
= uc
->uc_mcontext
.sc_pc
;
566 /* XXX: need kernel patch to get write flag faster */
567 switch (insn
>> 26) {
582 return handle_cpu_signal(pc
, (unsigned long)info
->si_addr
,
583 is_write
, &uc
->uc_sigmask
);
585 #elif defined(__sparc__)
587 int cpu_signal_handler(int host_signum
, struct siginfo
*info
,
590 uint32_t *regs
= (uint32_t *)(info
+ 1);
591 void *sigmask
= (regs
+ 20);
596 /* XXX: is there a standard glibc define ? */
598 /* XXX: need kernel patch to get write flag faster */
600 insn
= *(uint32_t *)pc
;
601 if ((insn
>> 30) == 3) {
602 switch((insn
>> 19) & 0x3f) {
614 return handle_cpu_signal(pc
, (unsigned long)info
->si_addr
,
618 #elif defined(__arm__)
620 int cpu_signal_handler(int host_signum
, struct siginfo
*info
,
623 struct ucontext
*uc
= puc
;
627 pc
= uc
->uc_mcontext
.gregs
[R15
];
628 /* XXX: compute is_write */
630 return handle_cpu_signal(pc
, (unsigned long)info
->si_addr
,
637 #error host CPU specific signal handler needed