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
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
|
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#define ULONG uint32_t
#define UCHAR uint8_t
#define FRMT "0x%x" // "0x%x"
#define SHFTFRMC "%s %s #%d" // "%s %s %d"
#define SHFTFRMR "%s %s %s" // "%s %s %s"
//#define FRMT "0x%x"
//#define SHFTFRMC "%s %s %d"
//#define SHFTFRMR "%s %s %s"
char *cond[16] = { "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", "hi", "ls", "ge", "lt", "gt", "le", "", "nv" };
char *cnd1[16] = { "eq", "ne", "cs", "cc", "mi", "pl", "vs", "vc", "hi", "ls", "ge", "lt", "gt", "le", " ", "nv" };
char *opcd[16] = {"and","eor","sub","rsb","add","adc","sbc","rsc","tst","teq","cmp","cmn","orr","mov","bic","mvn" };
char setc[32] = {0,115,0,115,0,115,0,115,0,115,0,115,0,115,0,115,0, 0 ,0, 0 ,0, 0 ,0, 0 ,0,115,0,115,0,115,0,115 };
char *regs[16] = { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "sl", "fp", "ip", "sp", "lr", "pc" };
char *shfts[4] = { "lsl", "lsr", "asr", "ror" };
/*
31-28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Cond 0 0 I ---Opcode--- S |----Rn----- ----Rd----- --------Operand 2-------- Data Processing /PSR Transfer
Cond 0 0 0 0 | 0 0 A S |----Rd----- ----Rn----- ---Rs---- 1 0 0 1 --Rm--- Multiply
Cond 0 0 0 0 | 1 U A S |---RdHi---- ---RdLo---- ---Rn---- 1 0 0 1 --Rm--- Multiply Long
Cond 0 0 0 1 | 0 B 0 0 |----Rn----- ----Rd----- 0 0 0 0 1 0 0 1 --Rm--- Single Data Swap
Cond 0 0 0 1 | 0 0 1 0 |1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 1 --Rn--- Branch and Exchange
Cond 0 0 0 P | U 0 W L |----Rn----- ----Rd----- 0 0 0 0 1 S H 1 --Rm--- Halfword Data Transfer: register offset
Cond 0 0 0 P | U 1 W L |----Rn----- ----Rd----- --Offset- 1 S H 1 -Offset Halfword Data Transfer: immediate offset
Cond 0 1 I P | U B W L |----Rn----- ----Rd----- --------Offset----------- Single Data Transfer
Cond 0 1 1 1 | x x x x |x x x x x x x x x x x x x x x 1 x x x x Undefined
Cond 1 0 0 P | U S W L |----Rn----- -----------Register List------------- Block Data Transfer
Cond 1 0 1 L | -------------------------Offset------------------------------ Branch
Cond 1 1 0 P | U N W L |----Rn----- ----CRd---- ---CP#--- -----Offset---- Coprocessor Data Transfer
Cond 1 1 1 0 | --CP Opc---|----CRn---- ----CRd---- ---CP#--- -CP-- 0 --CRm-- Coprocessor Data Operation
Cond 1 1 1 0 | CP Opc L |----CRn---- ----Rd----- ---CP#--- -CP-- 1 --CRm-- Coprocessor Register Transfer
Cond 1 1 1 1 | x x x x |x x x x x x x x x x x x x x x x x x x x Software Interrupt
0x04200000
0001 0 0 0 0 0 1 1 0 6 e 1 1 1 0 1 8
================================================================================
Cond 0 1 I P | U B W L |----Rn----- ----Rd----- --------Offset----------- Single Data Transfer
EQ 0 Z set equal
NE 1 Z clear not equal
CS 2 C set unsigned higher or same
CC 3 C clear unsigned lower
MI 4 N set negative
PL 5 N clear positive or zero
VS 6 V set overflow
VC 7 V clear no overflow
HI 8 C set and Z clear unsigned higher
LS 9 C clear or Z set unsigned lower or same
GE A N equals V greater or equal
LT B N not equal to V less than
GT C Z clear AND (N equals V) greater than
LE D Z set OR (N not equal to V) less than or equal
AL E (ignored) always
AND 0 operand1 AND operand2
EOR 1 operand1 EOR operand2
SUB 2 operand1 - operand2
RSB 3 operand2 - operand1
ADD 4 operand1 + operand2
ADC 5 operand1 + operand2 + carry
SBC 6 operand1 - operand2 + carry - 1
RSC 7 operand2 - operand1 + carry - 1
TST 8 AND, but result is not written
TEQ 9 as EOR, but result is not written
CMP A as SUB, but result is not written
CMN B as ADD, but result is not written
ORR C operand1 OR operand2
MOV D operand2 (operand1 is ignored)
BIC E operand1 AND NOT operand2 (Bit clear)
MVN F NOT operand2 (operand1 is ignored)
*/
void multiply_stg(char *stg, ULONG val)
{
if((val&0xc00000) == 0) // simple mul
{
if(val & 0x100000) // set condition flags
if(val & 0x200000) sprintf(stg+strlen(stg), "mla%ss ", cond[val>>28]);
else sprintf(stg+strlen(stg), "mul%ss ", cond[val>>28]);
else
if(val & 0x200000) sprintf(stg+strlen(stg), "mla%s ", cnd1[val>>28]);
else sprintf(stg+strlen(stg), "mul%s ", cnd1[val>>28]);
if(val & 0x200000) // accumulate
sprintf(stg+strlen(stg), "%s, %s, %s, %s", regs[(val>>16)&15], regs[(val>>0)&15], regs[(val>>8)&15], regs[(val>>12)&15]);
else
sprintf(stg+strlen(stg), "%s, %s, %s", regs[(val>>16)&15], regs[(val>>0)&15], regs[(val>>8)&15]);
}
else
{
if(val & 0x100000) // set condition flags
if(val & 0x200000) // accumulate
if(val & 0x400000) sprintf(stg+strlen(stg), "smlal%ss ", cond[val>>28]);
else sprintf(stg+strlen(stg), "umlal%ss ", cond[val>>28]);
else
if(val & 0x400000) sprintf(stg+strlen(stg), "smull%ss ", cond[val>>28]);
else sprintf(stg+strlen(stg), "umull%ss ", cond[val>>28]);
else
if(val & 0x200000)
if(val & 0x400000) sprintf(stg+strlen(stg), "smlal%s ", cond[val>>28]);
else sprintf(stg+strlen(stg), "umlal%s ", cond[val>>28]);
else
if(val & 0x400000) sprintf(stg+strlen(stg), "smull%s ", cond[val>>28]);
else sprintf(stg+strlen(stg), "umull%s ", cond[val>>28]);
sprintf(stg+strlen(stg), "%s, %s, %s, %s", regs[(val>>12)&15], regs[(val>>16)&15], regs[(val>>0)&15], regs[(val>>8)&15]);
}
}
void halfword_stg(char *stg, ULONG val)
{
ULONG off = ((val>>4) & 0xf0) + (val & 0x0f);
if(val & 0x100000) sprintf(stg+strlen(stg), "ldr%s", cond[val>>28]);
else sprintf(stg+strlen(stg), "str%s", cond[val>>28]);
switch((val>>5) & 3) // SWP, HW, SB, SH
{
case 0: sprintf(stg+strlen(stg), "error: SWP"); break;
case 1: sprintf(stg+strlen(stg), "h "); break;
case 2: sprintf(stg+strlen(stg), "sb "); break;
case 3: sprintf(stg+strlen(stg), "sh "); break;
}
if(val & 0x400000) // immidiate offset
if(val & 0x1000000) // pre index
if(val & 0x200000) // write back
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s, "FRMT"]!", regs[(val>>12)&15], regs[(val>>16)&15], off);
else sprintf(stg+strlen(stg), "%s, [%s, -"FRMT"]!", regs[(val>>12)&15], regs[(val>>16)&15], off);
else
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s, "FRMT"]", regs[(val>>12)&15], regs[(val>>16)&15], off);
else sprintf(stg+strlen(stg), "%s, [%s, -"FRMT"]", regs[(val>>12)&15], regs[(val>>16)&15], off);
else
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "error 'write back' on post indexed");
else
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s], "FRMT, regs[(val>>12)&15], regs[(val>>16)&15], off);
else sprintf(stg+strlen(stg), "%s, [%s], -"FRMT, regs[(val>>12)&15], regs[(val>>16)&15], off);
else
if(val & 0x1000000) // pre index
if(val & 0x200000) // write back
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s, %s]!", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
else sprintf(stg+strlen(stg), "%s, [%s, -%s]!", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
else
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s, %s]", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
else sprintf(stg+strlen(stg), "%s, [%s, -%s]", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
else
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "error 'write back' on post indexed");
else
if(val & 0x800000) sprintf(stg+strlen(stg), "%s, [%s], %s", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
else sprintf(stg+strlen(stg), "%s, [%s], -%s", regs[(val>>12)&15], regs[(val>>16)&15], regs[val&15]);
}
void branch_stg(char *stg, ULONG val, ULONG pos)
{
ULONG off = pos + (((int32_t)val << 8) >> 6) + 8;
if((val & 0x0ffffff0) == 0x012fff10) // bx instruction
{ sprintf(stg+strlen(stg), "bx%s %s", cond[val>>28], regs[val&15]); }
else
{
if(((val>>24)&15) == 10) sprintf(stg+strlen(stg), "b%s ", cond[val>>28]);
else sprintf(stg+strlen(stg), "bl%s ", cond[val>>28]);
sprintf(stg+strlen(stg), "0x%x", off);
}
}
void opcode_stg(char *stg, ULONG val, ULONG off)
{
ULONG des, op1;
char op2[80];
char *st = stg + strlen(stg);
if(((val & 0x0ffffff0) == 0x012fff10) && (val & 16))
{ branch_stg(stg, val, off); return; }
else if(((val & 0x0f000000) == 0x00000000) && ((val & 0xf0) == 0x90))
{ multiply_stg(stg, val); return; }
else if(((val & 0x0f000000) <= 0x01000000) && ((val & 0x90) == 0x90) && ((val & 0xf0) > 0x90) && ((val & 0x01200000) != 0x00200000))
{ halfword_stg(stg, val); return; }
sprintf(stg+strlen(stg), "%s%s%s ", opcd[(val>>21) & 15], cond[val>>28], setc[(val>>20) & 31]?"s":" ");
des = (val>>12) & 15;
op1 = (val>>16) & 15;
if(val & 0x2000000) // immidiate
{
off = (ULONG)((uint64_t)(val&0xff) << (32 - 2 * ((val >> 8) & 15))) | ((val&0xff) >> 2 * ((val >> 8) & 15));
sprintf(op2, FRMT" ", off);
}
else
{
if(val & 16) // shift type
sprintf(op2, SHFTFRMR, regs[val&15], shfts[(val>>5)&3], regs[(val>>8)&15]);
else
if((val>>7) & 31)
sprintf(op2, SHFTFRMC, regs[val&15], shfts[(val>>5)&3], (val>>7) & 31);
else
sprintf(op2, "%s ", regs[val&15]);
}
switch((val>>21) & 15)
{
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 12:
case 14: sprintf(stg+strlen(stg), "%s, %s, %s", regs[des], regs[op1], op2); break;
case 8: case 9: case 10:
case 11: if(val & 0x100000) // set status
sprintf(stg+strlen(stg), "%s, %s", regs[op1], op2); // standard TEQ,TST,CMP,CMN
else
{ //special MRS/MSR opcodes
if((((val>>23) & 31) == 2) && ((val & 0x3f0fff) == 0x0f0000))
{ sprintf(st, "mrs%s %s, %s", cnd1[val>>28], regs[des], val&0x400000?"SPSR_xx":"CPSR"); }
else
if((((val>>23) & 31) == 2) && ((val & 0x30fff0) == 0x20f000))
{ sprintf(st, "msr%s %s, %s", cnd1[val>>28], val&0x400000?"SPSR_xx":"CPSR", regs[val&15]); }
else
if((((val>>23) & 31) == 6) && ((val & 0x30f000) == 0x20f000))
{ sprintf(st, "msr%s %s, %s", cnd1[val>>28], val&0x400000?"SPSR_xx":"CPSR_cf", op2); }
else
if((((val>>23) & 31) == 2) && ((val & 0x300ff0) == 0x000090))
{ sprintf(st, "swp%s%s %s, %s, [%s]", val&0x400000?"b":"", cnd1[val>>28], regs[(val>>12)&15], regs[val&15], regs[(val>>16)&15]); }
else
{ sprintf(stg+strlen(stg), "??????????????"); }
} break;
case 13:
case 15: sprintf(stg+strlen(stg), "%s, %s", regs[des], op2); break;
}
}
void opcode_cop(char *stg, ULONG val, ULONG off)
{
char* op;
int opcode1 = (val >> 21) & 0x7;
int CRn = (val >> 16) & 0xf;
int Rd = (val >> 12) & 0xf;
int cp_num = (val >> 8) & 0xf;
int opcode2 = (val >> 5) & 0x7;
int CRm = val & 0xf;
// ee073f5e mcr 15, 0, r3, cr7, cr14, {2}
if (val & (1<<4)) {
if (val & (1<<20)) {
op = "mrc";
} else {
op = "mcr";
}
opcode1 = (val >> 21) & 0x7;
CRn = (val >> 16) & 0xf;
Rd = (val >> 12) & 0xf;
cp_num = (val >> 8) & 0xf;
opcode2 = (val >> 5) & 0x7;
CRm = val & 0xf;
sprintf(stg+strlen(stg), "%s%s %d, %d, r%d, cr%d, cr%d, {%d}", op, cnd1[val>>28], cp_num, opcode1, Rd, CRn, CRm, opcode2);
} else {
op = "cdp";
opcode1 = (val >> 20) & 0xf;
CRn = (val >> 16) & 0xf;
Rd = (val >> 12) & 0xf;
cp_num = (val >> 8) & 0xf;
opcode2 = (val >> 5) & 0x7;
CRm = val & 0xf;
sprintf(stg+strlen(stg), "%s%s %d, %d, cr%d, cr%d, cr%d, {%d}", op, cnd1[val>>28], cp_num, opcode1, Rd, CRn, CRm, opcode2);
}
}
void single_data(char *stg, ULONG val)
{
char op2[80];
if(((val & 0x0e000000) == 0x06000000) && (val & 16))
{ sprintf(stg+strlen(stg), "undef%s", cond[val>>28]);
return;
}
if(val & 0x400000)
if(val & 0x100000) sprintf(stg+strlen(stg), "ldr%sb ", cond[val>>28]);
else sprintf(stg+strlen(stg), "str%sb ", cond[val>>28]);
else
if(val & 0x100000) sprintf(stg+strlen(stg), "ldr%s ", cnd1[val>>28]);
else sprintf(stg+strlen(stg), "str%s ", cnd1[val>>28]);
if(val & 0x2000000) {// reg offset
if(val & 16) // shift type
sprintf(op2, "error: reg defined shift");
else
if((val>>7) & 31)
sprintf(op2, SHFTFRMC, regs[val&15], shfts[(val>>5)&3], (val>>7) & 31);
else
sprintf(op2, "%s", regs[val&15]);
}
if(val & 0x2000000) // reg offset
if(val & 0x1000000) // pre index
if(val & 0x800000) // up offset (+)
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "%s, [%s, %s]!", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
sprintf(stg+strlen(stg), "%s, [%s, %s]", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "%s, [%s, -%s]!", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
sprintf(stg+strlen(stg), "%s, [%s, -%s]", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "error 'write back' set");
else
if(val & 0x800000) // up offset (+)
sprintf(stg+strlen(stg), "%s, [%s], %s", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
sprintf(stg+strlen(stg), "%s, [%s], -%s", regs[(val>>12)&15], regs[(val>>16)&15], op2);
else
if(val & 0x1000000) // pre index
if(val & 0x800000) // up offset (+)
if(val & 0x200000) // write back
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s, "FRMT"]!", regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]!", regs[(val>>12)&15], regs[(val>>16)&15]);
else
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s, "FRMT"]", regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]", regs[(val>>12)&15], regs[(val>>16)&15]);
else
if(val & 0x200000) // write back
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s, -"FRMT"]!", regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]!", regs[(val>>12)&15], regs[(val>>16)&15]);
else
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s, -"FRMT"]", regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]", regs[(val>>12)&15], regs[(val>>16)&15]);
else
if(val & 0x200000) // write back
sprintf(stg+strlen(stg), "error 'write back' set");
else
if(val & 0x800000) // up offset (+)
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s], "FRMT, regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]", regs[(val>>12)&15], regs[(val>>16)&15]);
else
if(val & 0xfff) sprintf(stg+strlen(stg), "%s, [%s], -"FRMT, regs[(val>>12)&15], regs[(val>>16)&15], val & 0xfff);
else sprintf(stg+strlen(stg), "%s, [%s]", regs[(val>>12)&15], regs[(val>>16)&15]);
}
void block_data(char *stg, ULONG val)
{
char lst[80];
int i;
strcpy(lst, "{");
for(i=0; i<16; i++)
if(val & (1<<i))
sprintf(lst+strlen(lst), "%s, ", regs[i]);
if(strlen(lst)>2)
strcpy(lst+strlen(lst)-2, "}");
else
strcpy(lst+strlen(lst), "}");
if(val & 0x400000) // load psr or force user mode
strcpy(lst+strlen(lst), "^");
if(val & 0x100000) // load
if(val & 0x1000000) // pre offset
if(val & 0x800000) sprintf(stg+strlen(stg), "ldm%sib ", cond[val>>28]);
else sprintf(stg+strlen(stg), "ldm%sdb ", cond[val>>28]);
else
if(val & 0x800000) sprintf(stg+strlen(stg), "ldm%sia ", cond[val>>28]);
else sprintf(stg+strlen(stg), "ldm%sda ", cond[val>>28]);
else
if(val & 0x1000000)
if(val & 0x800000) sprintf(stg+strlen(stg), "stm%sib ", cond[val>>28]);
else sprintf(stg+strlen(stg), "stm%sdb ", cond[val>>28]);
else
if(val & 0x800000) sprintf(stg+strlen(stg), "stm%sia ", cond[val>>28]);
else sprintf(stg+strlen(stg), "stm%sda ", cond[val>>28]);
switch((val>>21)&3)
{
case 0: sprintf(stg+strlen(stg), "%s, %s", regs[(val>>16)&15], lst); break;
case 1: sprintf(stg+strlen(stg), "%s!, %s", regs[(val>>16)&15], lst); break;
case 2: sprintf(stg+strlen(stg), "%s, %s", regs[(val>>16)&15], lst); break;
case 3: sprintf(stg+strlen(stg), "%s!, %s", regs[(val>>16)&15], lst); break;
}
}
void dis_asm(ULONG off, ULONG val, char *stg)
{
sprintf(stg, "%6x: %08x ", off, val);
switch((val >> 24) & 15)
{
case 0:
case 1:
case 2:
case 3: opcode_stg(stg, val, off); break;
case 4:
case 5:
case 6:
case 7: single_data(stg, val); break;
case 8:
case 9: block_data(stg, val); break;
case 10:
case 11: branch_stg(stg, val, off); break;
case 12:
case 13: sprintf(stg+strlen(stg), "cop%s", cnd1[val>>28]); break;
case 14: opcode_cop(stg, val, off); break;
case 15: sprintf(stg+strlen(stg), "swi%s", cnd1[val>>28]); break;
}
}
|
