root / exec-i386.c @ 04369ff2
History | View | Annotate | Download (7.9 kB)
1 |
/*
|
---|---|
2 |
* i386 emulator main execution loop
|
3 |
*
|
4 |
* Copyright (c) 2003 Fabrice Bellard
|
5 |
*
|
6 |
* This program is free software; you can redistribute it and/or modify
|
7 |
* it under the terms of the GNU General Public License as published by
|
8 |
* the Free Software Foundation; either version 2 of the License, or
|
9 |
* (at your option) any later version.
|
10 |
*
|
11 |
* This program 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
|
14 |
* GNU General Public License for more details.
|
15 |
*
|
16 |
* You should have received a copy of the GNU General Public License
|
17 |
* along with this program; if not, write to the Free Software
|
18 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
19 |
*/
|
20 |
#include "exec-i386.h" |
21 |
|
22 |
//#define DEBUG_EXEC
|
23 |
#define DEBUG_FLUSH
|
24 |
|
25 |
/* main execution loop */
|
26 |
|
27 |
/* maximum total translate dcode allocated */
|
28 |
#define CODE_GEN_BUFFER_SIZE (2048 * 1024) |
29 |
//#define CODE_GEN_BUFFER_SIZE (128 * 1024)
|
30 |
#define CODE_GEN_MAX_SIZE 65536 |
31 |
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */ |
32 |
|
33 |
/* threshold to flush the translated code buffer */
|
34 |
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
|
35 |
|
36 |
#define CODE_GEN_MAX_BLOCKS (CODE_GEN_BUFFER_SIZE / 64) |
37 |
#define CODE_GEN_HASH_BITS 15 |
38 |
#define CODE_GEN_HASH_SIZE (1 << CODE_GEN_HASH_BITS) |
39 |
|
40 |
typedef struct TranslationBlock { |
41 |
unsigned long pc; /* simulated PC corresponding to this block */ |
42 |
unsigned int flags; /* flags defining in which context the code was generated */ |
43 |
uint8_t *tc_ptr; /* pointer to the translated code */
|
44 |
struct TranslationBlock *hash_next; /* next matching block */ |
45 |
} TranslationBlock; |
46 |
|
47 |
TranslationBlock tbs[CODE_GEN_MAX_BLOCKS]; |
48 |
TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE]; |
49 |
int nb_tbs;
|
50 |
|
51 |
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE]; |
52 |
uint8_t *code_gen_ptr; |
53 |
|
54 |
#ifdef DEBUG_EXEC
|
55 |
static const char *cc_op_str[] = { |
56 |
"DYNAMIC",
|
57 |
"EFLAGS",
|
58 |
"MUL",
|
59 |
"ADDB",
|
60 |
"ADDW",
|
61 |
"ADDL",
|
62 |
"ADCB",
|
63 |
"ADCW",
|
64 |
"ADCL",
|
65 |
"SUBB",
|
66 |
"SUBW",
|
67 |
"SUBL",
|
68 |
"SBBB",
|
69 |
"SBBW",
|
70 |
"SBBL",
|
71 |
"LOGICB",
|
72 |
"LOGICW",
|
73 |
"LOGICL",
|
74 |
"INCB",
|
75 |
"INCW",
|
76 |
"INCL",
|
77 |
"DECB",
|
78 |
"DECW",
|
79 |
"DECL",
|
80 |
"SHLB",
|
81 |
"SHLW",
|
82 |
"SHLL",
|
83 |
"SARB",
|
84 |
"SARW",
|
85 |
"SARL",
|
86 |
}; |
87 |
|
88 |
static void cpu_x86_dump_state(void) |
89 |
{ |
90 |
int eflags;
|
91 |
eflags = cc_table[CC_OP].compute_all(); |
92 |
eflags |= (DF & DIRECTION_FLAG); |
93 |
fprintf(logfile, |
94 |
"EAX=%08x EBX=%08X ECX=%08x EDX=%08x\n"
|
95 |
"ESI=%08x EDI=%08X EBP=%08x ESP=%08x\n"
|
96 |
"CCS=%08x CCD=%08x CCO=%-8s EFL=%c%c%c%c%c%c%c\n",
|
97 |
env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX], |
98 |
env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP], |
99 |
env->cc_src, env->cc_dst, cc_op_str[env->cc_op], |
100 |
eflags & DIRECTION_FLAG ? 'D' : '-', |
101 |
eflags & CC_O ? 'O' : '-', |
102 |
eflags & CC_S ? 'S' : '-', |
103 |
eflags & CC_Z ? 'Z' : '-', |
104 |
eflags & CC_A ? 'A' : '-', |
105 |
eflags & CC_P ? 'P' : '-', |
106 |
eflags & CC_C ? 'C' : '-' |
107 |
); |
108 |
#if 1 |
109 |
fprintf(logfile, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
|
110 |
(double)ST0, (double)ST1, (double)ST(2), (double)ST(3)); |
111 |
#endif
|
112 |
} |
113 |
|
114 |
#endif
|
115 |
|
116 |
void cpu_x86_tblocks_init(void) |
117 |
{ |
118 |
if (!code_gen_ptr) {
|
119 |
code_gen_ptr = code_gen_buffer; |
120 |
} |
121 |
} |
122 |
|
123 |
/* flush all the translation blocks */
|
124 |
static void tb_flush(void) |
125 |
{ |
126 |
int i;
|
127 |
#ifdef DEBUG_FLUSH
|
128 |
printf("gemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n",
|
129 |
code_gen_ptr - code_gen_buffer, |
130 |
nb_tbs, |
131 |
(code_gen_ptr - code_gen_buffer) / nb_tbs); |
132 |
#endif
|
133 |
nb_tbs = 0;
|
134 |
for(i = 0;i < CODE_GEN_HASH_SIZE; i++) |
135 |
tb_hash[i] = NULL;
|
136 |
code_gen_ptr = code_gen_buffer; |
137 |
/* XXX: flush processor icache at this point */
|
138 |
} |
139 |
|
140 |
/* find a translation block in the translation cache. If not found,
|
141 |
allocate a new one */
|
142 |
static inline TranslationBlock *tb_find_and_alloc(unsigned long pc, |
143 |
unsigned int flags) |
144 |
{ |
145 |
TranslationBlock **ptb, *tb; |
146 |
unsigned int h; |
147 |
|
148 |
h = pc & (CODE_GEN_HASH_SIZE - 1);
|
149 |
ptb = &tb_hash[h]; |
150 |
for(;;) {
|
151 |
tb = *ptb; |
152 |
if (!tb)
|
153 |
break;
|
154 |
if (tb->pc == pc && tb->flags == flags)
|
155 |
return tb;
|
156 |
ptb = &tb->hash_next; |
157 |
} |
158 |
if (nb_tbs >= CODE_GEN_MAX_BLOCKS ||
|
159 |
(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE) |
160 |
tb_flush(); |
161 |
tb = &tbs[nb_tbs++]; |
162 |
*ptb = tb; |
163 |
tb->pc = pc; |
164 |
tb->flags = flags; |
165 |
tb->tc_ptr = NULL;
|
166 |
tb->hash_next = NULL;
|
167 |
return tb;
|
168 |
} |
169 |
|
170 |
int cpu_x86_exec(CPUX86State *env1)
|
171 |
{ |
172 |
int saved_T0, saved_T1, saved_A0;
|
173 |
CPUX86State *saved_env; |
174 |
#ifdef reg_EAX
|
175 |
int saved_EAX;
|
176 |
#endif
|
177 |
#ifdef reg_ECX
|
178 |
int saved_ECX;
|
179 |
#endif
|
180 |
#ifdef reg_EDX
|
181 |
int saved_EDX;
|
182 |
#endif
|
183 |
#ifdef reg_EBX
|
184 |
int saved_EBX;
|
185 |
#endif
|
186 |
#ifdef reg_ESP
|
187 |
int saved_ESP;
|
188 |
#endif
|
189 |
#ifdef reg_EBP
|
190 |
int saved_EBP;
|
191 |
#endif
|
192 |
#ifdef reg_ESI
|
193 |
int saved_ESI;
|
194 |
#endif
|
195 |
#ifdef reg_EDI
|
196 |
int saved_EDI;
|
197 |
#endif
|
198 |
int code_gen_size, ret;
|
199 |
void (*gen_func)(void); |
200 |
TranslationBlock *tb; |
201 |
uint8_t *tc_ptr; |
202 |
unsigned int flags; |
203 |
|
204 |
/* first we save global registers */
|
205 |
saved_T0 = T0; |
206 |
saved_T1 = T1; |
207 |
saved_A0 = A0; |
208 |
saved_env = env; |
209 |
env = env1; |
210 |
#ifdef reg_EAX
|
211 |
saved_EAX = EAX; |
212 |
EAX = env->regs[R_EAX]; |
213 |
#endif
|
214 |
#ifdef reg_ECX
|
215 |
saved_ECX = ECX; |
216 |
ECX = env->regs[R_ECX]; |
217 |
#endif
|
218 |
#ifdef reg_EDX
|
219 |
saved_EDX = EDX; |
220 |
EDX = env->regs[R_EDX]; |
221 |
#endif
|
222 |
#ifdef reg_EBX
|
223 |
saved_EBX = EBX; |
224 |
EBX = env->regs[R_EBX]; |
225 |
#endif
|
226 |
#ifdef reg_ESP
|
227 |
saved_ESP = ESP; |
228 |
ESP = env->regs[R_ESP]; |
229 |
#endif
|
230 |
#ifdef reg_EBP
|
231 |
saved_EBP = EBP; |
232 |
EBP = env->regs[R_EBP]; |
233 |
#endif
|
234 |
#ifdef reg_ESI
|
235 |
saved_ESI = ESI; |
236 |
ESI = env->regs[R_ESI]; |
237 |
#endif
|
238 |
#ifdef reg_EDI
|
239 |
saved_EDI = EDI; |
240 |
EDI = env->regs[R_EDI]; |
241 |
#endif
|
242 |
|
243 |
/* prepare setjmp context for exception handling */
|
244 |
if (setjmp(env->jmp_env) == 0) { |
245 |
for(;;) {
|
246 |
#ifdef DEBUG_EXEC
|
247 |
if (loglevel) {
|
248 |
cpu_x86_dump_state(); |
249 |
} |
250 |
#endif
|
251 |
/* we compute the CPU state. We assume it will not
|
252 |
change during the whole generated block. */
|
253 |
flags = env->seg_cache[R_CS].seg_32bit << GEN_FLAG_CODE32_SHIFT; |
254 |
flags |= (((unsigned long)env->seg_cache[R_DS].base | |
255 |
(unsigned long)env->seg_cache[R_ES].base | |
256 |
(unsigned long)env->seg_cache[R_SS].base) != 0) << |
257 |
GEN_FLAG_ADDSEG_SHIFT; |
258 |
tb = tb_find_and_alloc((unsigned long)env->pc, flags); |
259 |
tc_ptr = tb->tc_ptr; |
260 |
if (!tb->tc_ptr) {
|
261 |
/* if no translated code available, then translate it now */
|
262 |
tc_ptr = code_gen_ptr; |
263 |
cpu_x86_gen_code(code_gen_ptr, CODE_GEN_MAX_SIZE, |
264 |
&code_gen_size, (uint8_t *)env->pc, flags); |
265 |
tb->tc_ptr = tc_ptr; |
266 |
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1)); |
267 |
} |
268 |
/* execute the generated code */
|
269 |
gen_func = (void *)tc_ptr;
|
270 |
gen_func(); |
271 |
} |
272 |
} |
273 |
ret = env->exception_index; |
274 |
|
275 |
/* restore global registers */
|
276 |
#ifdef reg_EAX
|
277 |
EAX = saved_EAX; |
278 |
#endif
|
279 |
#ifdef reg_ECX
|
280 |
ECX = saved_ECX; |
281 |
#endif
|
282 |
#ifdef reg_EDX
|
283 |
EDX = saved_EDX; |
284 |
#endif
|
285 |
#ifdef reg_EBX
|
286 |
EBX = saved_EBX; |
287 |
#endif
|
288 |
#ifdef reg_ESP
|
289 |
ESP = saved_ESP; |
290 |
#endif
|
291 |
#ifdef reg_EBP
|
292 |
EBP = saved_EBP; |
293 |
#endif
|
294 |
#ifdef reg_ESI
|
295 |
ESI = saved_ESI; |
296 |
#endif
|
297 |
#ifdef reg_EDI
|
298 |
EDI = saved_EDI; |
299 |
#endif
|
300 |
T0 = saved_T0; |
301 |
T1 = saved_T1; |
302 |
A0 = saved_A0; |
303 |
env = saved_env; |
304 |
return ret;
|
305 |
} |
306 |
|
307 |
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector) |
308 |
{ |
309 |
CPUX86State *saved_env; |
310 |
|
311 |
saved_env = env; |
312 |
env = s; |
313 |
load_seg(seg_reg, selector); |
314 |
env = saved_env; |
315 |
} |