1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
|
/*
* i386 emulator main execution loop
*
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "exec-i386.h"
//#define DEBUG_EXEC
#define DEBUG_FLUSH
/* main execution loop */
/* maximum total translate dcode allocated */
#define CODE_GEN_BUFFER_SIZE (2048 * 1024)
//#define CODE_GEN_BUFFER_SIZE (128 * 1024)
#define CODE_GEN_MAX_SIZE 65536
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
/* threshold to flush the translated code buffer */
#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
#define CODE_GEN_MAX_BLOCKS (CODE_GEN_BUFFER_SIZE / 64)
#define CODE_GEN_HASH_BITS 15
#define CODE_GEN_HASH_SIZE (1 << CODE_GEN_HASH_BITS)
typedef struct TranslationBlock {
unsigned long pc; /* simulated PC corresponding to this block (EIP + CS base) */
unsigned long cs_base; /* CS base for this block */
unsigned int flags; /* flags defining in which context the code was generated */
uint8_t *tc_ptr; /* pointer to the translated code */
struct TranslationBlock *hash_next; /* next matching block */
} TranslationBlock;
TranslationBlock tbs[CODE_GEN_MAX_BLOCKS];
TranslationBlock *tb_hash[CODE_GEN_HASH_SIZE];
int nb_tbs;
uint8_t code_gen_buffer[CODE_GEN_BUFFER_SIZE];
uint8_t *code_gen_ptr;
#ifdef DEBUG_EXEC
static const char *cc_op_str[] = {
"DYNAMIC",
"EFLAGS",
"MUL",
"ADDB",
"ADDW",
"ADDL",
"ADCB",
"ADCW",
"ADCL",
"SUBB",
"SUBW",
"SUBL",
"SBBB",
"SBBW",
"SBBL",
"LOGICB",
"LOGICW",
"LOGICL",
"INCB",
"INCW",
"INCL",
"DECB",
"DECW",
"DECL",
"SHLB",
"SHLW",
"SHLL",
"SARB",
"SARW",
"SARL",
};
static void cpu_x86_dump_state(void)
{
int eflags;
eflags = cc_table[CC_OP].compute_all();
eflags |= (DF & DIRECTION_FLAG);
fprintf(logfile,
"EAX=%08x EBX=%08X ECX=%08x EDX=%08x\n"
"ESI=%08x EDI=%08X EBP=%08x ESP=%08x\n"
"CCS=%08x CCD=%08x CCO=%-8s EFL=%c%c%c%c%c%c%c\n",
env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX],
env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP],
env->cc_src, env->cc_dst, cc_op_str[env->cc_op],
eflags & DIRECTION_FLAG ? 'D' : '-',
eflags & CC_O ? 'O' : '-',
eflags & CC_S ? 'S' : '-',
eflags & CC_Z ? 'Z' : '-',
eflags & CC_A ? 'A' : '-',
eflags & CC_P ? 'P' : '-',
eflags & CC_C ? 'C' : '-'
);
#if 1
fprintf(logfile, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
(double)ST0, (double)ST1, (double)ST(2), (double)ST(3));
#endif
}
#endif
void cpu_x86_tblocks_init(void)
{
if (!code_gen_ptr) {
code_gen_ptr = code_gen_buffer;
}
}
/* flush all the translation blocks */
static void tb_flush(void)
{
int i;
#ifdef DEBUG_FLUSH
printf("gemu: flush code_size=%d nb_tbs=%d avg_tb_size=%d\n",
code_gen_ptr - code_gen_buffer,
nb_tbs,
(code_gen_ptr - code_gen_buffer) / nb_tbs);
#endif
nb_tbs = 0;
for(i = 0;i < CODE_GEN_HASH_SIZE; i++)
tb_hash[i] = NULL;
code_gen_ptr = code_gen_buffer;
/* XXX: flush processor icache at this point */
}
/* find a translation block in the translation cache. If not found,
allocate a new one */
static inline TranslationBlock *tb_find_and_alloc(unsigned long pc,
unsigned long cs_base,
unsigned int flags)
{
TranslationBlock **ptb, *tb;
unsigned int h;
h = pc & (CODE_GEN_HASH_SIZE - 1);
ptb = &tb_hash[h];
for(;;) {
tb = *ptb;
if (!tb)
break;
if (tb->pc == pc && tb->cs_base == cs_base && tb->flags == flags)
return tb;
ptb = &tb->hash_next;
}
if (nb_tbs >= CODE_GEN_MAX_BLOCKS ||
(code_gen_ptr - code_gen_buffer) >= CODE_GEN_BUFFER_MAX_SIZE)
tb_flush();
tb = &tbs[nb_tbs++];
*ptb = tb;
tb->pc = pc;
tb->cs_base = cs_base;
tb->flags = flags;
tb->tc_ptr = NULL;
tb->hash_next = NULL;
return tb;
}
int cpu_x86_exec(CPUX86State *env1)
{
int saved_T0, saved_T1, saved_A0;
CPUX86State *saved_env;
#ifdef reg_EAX
int saved_EAX;
#endif
#ifdef reg_ECX
int saved_ECX;
#endif
#ifdef reg_EDX
int saved_EDX;
#endif
#ifdef reg_EBX
int saved_EBX;
#endif
#ifdef reg_ESP
int saved_ESP;
#endif
#ifdef reg_EBP
int saved_EBP;
#endif
#ifdef reg_ESI
int saved_ESI;
#endif
#ifdef reg_EDI
int saved_EDI;
#endif
int code_gen_size, ret;
void (*gen_func)(void);
TranslationBlock *tb;
uint8_t *tc_ptr, *cs_base, *pc;
unsigned int flags;
/* first we save global registers */
saved_T0 = T0;
saved_T1 = T1;
saved_A0 = A0;
saved_env = env;
env = env1;
#ifdef reg_EAX
saved_EAX = EAX;
EAX = env->regs[R_EAX];
#endif
#ifdef reg_ECX
saved_ECX = ECX;
ECX = env->regs[R_ECX];
#endif
#ifdef reg_EDX
saved_EDX = EDX;
EDX = env->regs[R_EDX];
#endif
#ifdef reg_EBX
saved_EBX = EBX;
EBX = env->regs[R_EBX];
#endif
#ifdef reg_ESP
saved_ESP = ESP;
ESP = env->regs[R_ESP];
#endif
#ifdef reg_EBP
saved_EBP = EBP;
EBP = env->regs[R_EBP];
#endif
#ifdef reg_ESI
saved_ESI = ESI;
ESI = env->regs[R_ESI];
#endif
#ifdef reg_EDI
saved_EDI = EDI;
EDI = env->regs[R_EDI];
#endif
/* prepare setjmp context for exception handling */
if (setjmp(env->jmp_env) == 0) {
for(;;) {
#ifdef DEBUG_EXEC
if (loglevel) {
cpu_x86_dump_state();
}
#endif
/* we compute the CPU state. We assume it will not
change during the whole generated block. */
flags = env->seg_cache[R_CS].seg_32bit << GEN_FLAG_CODE32_SHIFT;
flags |= env->seg_cache[R_SS].seg_32bit << GEN_FLAG_SS32_SHIFT;
flags |= (((unsigned long)env->seg_cache[R_DS].base |
(unsigned long)env->seg_cache[R_ES].base |
(unsigned long)env->seg_cache[R_SS].base) != 0) <<
GEN_FLAG_ADDSEG_SHIFT;
cs_base = env->seg_cache[R_CS].base;
pc = cs_base + env->eip;
tb = tb_find_and_alloc((unsigned long)pc, (unsigned long)cs_base,
flags);
tc_ptr = tb->tc_ptr;
if (!tb->tc_ptr) {
/* if no translated code available, then translate it now */
tc_ptr = code_gen_ptr;
cpu_x86_gen_code(code_gen_ptr, CODE_GEN_MAX_SIZE,
&code_gen_size, pc, cs_base, flags);
tb->tc_ptr = tc_ptr;
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
}
/* execute the generated code */
gen_func = (void *)tc_ptr;
gen_func();
}
}
ret = env->exception_index;
/* restore global registers */
#ifdef reg_EAX
EAX = saved_EAX;
#endif
#ifdef reg_ECX
ECX = saved_ECX;
#endif
#ifdef reg_EDX
EDX = saved_EDX;
#endif
#ifdef reg_EBX
EBX = saved_EBX;
#endif
#ifdef reg_ESP
ESP = saved_ESP;
#endif
#ifdef reg_EBP
EBP = saved_EBP;
#endif
#ifdef reg_ESI
ESI = saved_ESI;
#endif
#ifdef reg_EDI
EDI = saved_EDI;
#endif
T0 = saved_T0;
T1 = saved_T1;
A0 = saved_A0;
env = saved_env;
return ret;
}
void cpu_x86_load_seg(CPUX86State *s, int seg_reg, int selector)
{
CPUX86State *saved_env;
saved_env = env;
env = s;
load_seg(seg_reg, selector);
env = saved_env;
}
|
