1 /* $NetBSD: db_disasm.c,v 1.49 2021/05/23 11:56:28 riastradh Exp $ */
2
3 /*
4 * Mach Operating System
5 * Copyright (c) 1991,1990 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
21 * School of Computer Science
22 * Carnegie Mellon University
23 * Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie the
26 * rights to redistribute these changes.
27 *
28 * Id: db_disasm.c,v 2.3 91/02/05 17:11:03 mrt (CMU)
29 */
30
31 /*
32 * Instruction disassembler.
33 */
34
35 #include <sys/cdefs.h>
36 __KERNEL_RCSID(0, "$NetBSD: db_disasm.c,v 1.49 2021/05/23 11:56:28 riastradh Exp $");
37
38 #include <sys/param.h>
39 #include <sys/proc.h>
40 #include <machine/db_machdep.h>
41
42 #include <ddb/db_access.h>
43 #include <ddb/db_sym.h>
44 #include <ddb/db_output.h>
45 #include <ddb/db_interface.h>
46
47 /*
48 * Size attributes
49 */
50 #define BYTE 0
51 #define WORD 1
52 #define LONG 2
53 #define QUAD 3
54 #define SNGL 4
55 #define DBLR 5
56 #define EXTR 6
57 #define SDEP 7
58 #define NONE 8
59 #define RDEP 9
60
61 /*
62 * Addressing modes
63 */
64 #define E 1 /* general effective address */
65 #define Eind 2 /* indirect address (jump, call) */
66 #define Ew 3 /* address, word size */
67 #define Eb 4 /* address, byte size */
68 #define R 5 /* register, in 'reg' field */
69 #define Rw 6 /* word register, in 'reg' field */
70 #define Ri 7 /* register in instruction */
71 #define S 8 /* segment reg, in 'reg' field */
72 #define Si 9 /* segment reg, in instruction */
73 #define A 10 /* accumulator */
74 #define BX 11 /* (bx) */
75 #define CL 12 /* cl, for shifts */
76 #define DX 13 /* dx, for IO */
77 #define SI 14 /* si */
78 #define DI 15 /* di */
79 #define CR 16 /* control register */
80 #define DR 17 /* debug register */
81 #define TR 18 /* test register */
82 #define I 19 /* immediate, unsigned */
83 #define Is 20 /* immediate, signed */
84 #define Ib 21 /* byte immediate, unsigned */
85 #define Ibs 22 /* byte immediate, signed */
86 #define Iw 23 /* word immediate, unsigned */
87 #define Il 24 /* long immediate */
88 #define O 25 /* direct address */
89 #define Db 26 /* byte displacement from EIP */
90 #define Dl 27 /* long displacement from EIP */
91 #define o1 28 /* constant 1 */
92 #define o3 29 /* constant 3 */
93 #define OS 30 /* immediate offset/segment */
94 #define ST 31 /* FP stack top */
95 #define STI 32 /* FP stack */
96 #define X 33 /* extended FP op */
97 #define XA 34 /* for 'fstcw %ax' */
98 #define El 35 /* address, long size */
99 #define Ril 36 /* long register in instruction */
100 #define Iba 37 /* byte immediate, don't print if 0xa */
101 #define MEx 38 /* memory, or an extension op */
102
103 struct inst {
104 const char *i_name; /* name */
105 short i_has_modrm; /* has regmodrm byte */
106 short i_size; /* operand size */
107 int i_mode; /* addressing modes */
108 const void *i_extra; /* pointer to extra opcode table */
109 };
110
111 #define op1(x) (x)
112 #define op2(x,y) ((x)|((y)<<8))
113 #define op3(x,y,z) ((x)|((y)<<8)|((z)<<16))
114
115 struct finst {
116 const char *f_name; /* name for memory instruction */
117 int f_size; /* size for memory instruction */
118 int f_rrmode; /* mode for rr instruction */
119 const void *f_rrname; /* name for rr instruction
120 (or pointer to table) */
121 };
122
123 const char * const db_Grp6[] = {
124 "sldt",
125 "str",
126 "lldt",
127 "ltr",
128 "verr",
129 "verw",
130 "",
131 ""
132 };
133
134 struct inst db_Grp7[] = {
135 { "sgdt", false, NONE, op1(E), 0 },
136 { "sidt", false, NONE, op2(MEx,4), "monitor\0mwait\0clac\0stac"},
137 { "lgdt", false, NONE, op2(MEx,2), "xgetbv\0xsetbv" },
138 { "lidt", false, NONE, op1(E), 0 },
139 { "smsw", false, NONE, op1(E), 0 },
140 { "", false, NONE, 0, 0 },
141 { "lmsw", false, NONE, op1(E), 0 },
142 { "invlpg", false, NONE, op2(MEx,2), "swapgs\0rdtscp" },
143 };
144
145 const char * const db_Grp8[] = {
146 "",
147 "",
148 "",
149 "",
150 "bt",
151 "bts",
152 "btr",
153 "btc"
154 };
155
156 struct inst db_Grp9[] = {
157 { "fxsave", false, NONE, op1(E), 0 },
158 { "fxrstor", false, NONE, op1(E), 0 },
159 { "ldmxcsr", false, NONE, op1(E), 0 },
160 { "stmxcsr", false, NONE, op1(E), 0 },
161 { "xsave", false, NONE, op1(E), 0 },
162 { "xrstor", false, NONE, op2(MEx,1), "lfence" },
163 { "xsaveopt", false, NONE, op2(MEx,1), "mfence" },
164 { "clflush", false, NONE, op2(MEx,1), "sfence" },
165 };
166
167 const char * db_GrpA[] = {
168 "", "cmpxchg8b", "", "",
169 "", "", "rdrand", "rdseed"
170 };
171
172 const char * db_GrpB[] = {
173 "xstore-rng", "xcrypt-ecb", "xcrypt-cbc", "xcrypt-ctr",
174 "xcrypt-cfb", "xcrypt-ofb", "", ""
175 };
176
177 const char * db_GrpC[] = {
178 "montmul", "xsha1", "xsha256", "",
179 "", "", "", ""
180 };
181
182 const struct inst db_inst_0f0x[] = {
183 /*00*/ { NULL, true, NONE, op1(Ew), db_Grp6 },
184 /*01*/ { "", true, RDEP, op1(Ew), db_Grp7 },
185 /*02*/ { "lar", true, LONG, op2(E,R), 0 },
186 /*03*/ { "lsl", true, LONG, op2(E,R), 0 },
187 /*04*/ { "", false, NONE, 0, 0 },
188 /*05*/ { "", false, NONE, 0, 0 },
189 /*06*/ { "clts", false, NONE, 0, 0 },
190 /*07*/ { "", false, NONE, 0, 0 },
191
192 /*08*/ { "invd", false, NONE, 0, 0 },
193 /*09*/ { "wbinvd",false, NONE, 0, 0 },
194 /*0a*/ { "", false, NONE, 0, 0 },
195 /*0b*/ { "", false, NONE, 0, 0 },
196 /*0c*/ { "", false, NONE, 0, 0 },
197 /*0d*/ { "", false, NONE, 0, 0 },
198 /*0e*/ { "", false, NONE, 0, 0 },
199 /*0f*/ { "", false, NONE, 0, 0 },
200 };
201
202 const struct inst db_inst_0f2x[] = {
203 /*20*/ { "mov", true, LONG, op2(CR,El), 0 },
204 /*21*/ { "mov", true, LONG, op2(DR,El), 0 },
205 /*22*/ { "mov", true, LONG, op2(El,CR), 0 },
206 /*23*/ { "mov", true, LONG, op2(El,DR), 0 },
207 /*24*/ { "mov", true, LONG, op2(TR,El), 0 },
208 /*25*/ { "", false, NONE, 0, 0 },
209 /*26*/ { "mov", true, LONG, op2(El,TR), 0 },
210 /*27*/ { "", false, NONE, 0, 0 },
211
212 /*28*/ { "", false, NONE, 0, 0 },
213 /*29*/ { "", false, NONE, 0, 0 },
214 /*2a*/ { "", false, NONE, 0, 0 },
215 /*2b*/ { "", false, NONE, 0, 0 },
216 /*2c*/ { "", false, NONE, 0, 0 },
217 /*2d*/ { "", false, NONE, 0, 0 },
218 /*2e*/ { "", false, NONE, 0, 0 },
219 /*2f*/ { "", false, NONE, 0, 0 },
220 };
221
222 const struct inst db_inst_0f3x[] = {
223 /*30*/ { "wrmsr", false, NONE, 0, 0 },
224 /*31*/ { "rdtsc", false, NONE, 0, 0 },
225 /*32*/ { "rdmsr", false, NONE, 0, 0 },
226 /*33*/ { "rdpmc", false, NONE, 0, 0 },
227 /*34*/ { "sysenter",false,NONE, 0, 0 },
228 /*35*/ { "sysexit",false, NONE, 0, 0 },
229 /*36*/ { "", false, NONE, 0, 0 },
230 /*37*/ { "getsec",false, NONE, 0, 0 },
231
232 /*38*/ { "", false, NONE, 0, 0 },
233 /*39*/ { "", false, NONE, 0, 0 },
234 /*3a*/ { "", false, NONE, 0, 0 },
235 /*3b*/ { "", false, NONE, 0, 0 },
236 /*3c*/ { "", false, NONE, 0, 0 },
237 /*3d*/ { "", false, NONE, 0, 0 },
238 /*3e*/ { "", false, NONE, 0, 0 },
239 /*3f*/ { "", false, NONE, 0, 0 },
240 };
241
242 const struct inst db_inst_0f4x[] = {
243 /*40*/ { "cmovo", true, LONG, op2(E,R), 0 },
244 /*41*/ { "cmovno", true, LONG, op2(E,R), 0 },
245 /*42*/ { "cmovc", true, LONG, op2(E,R), 0 },
246 /*43*/ { "cmovnc", true, LONG, op2(E,R), 0 },
247 /*44*/ { "cmovz", true, LONG, op2(E,R), 0 },
248 /*45*/ { "cmovnz", true, LONG, op2(E,R), 0 },
249 /*46*/ { "cmovbe", true, LONG, op2(E,R), 0 },
250 /*47*/ { "cmovmbe",true, LONG, op2(E,R), 0 },
251
252 /*48*/ { "cmovs", true, LONG, op2(E,R), 0 },
253 /*49*/ { "cmovns", true, LONG, op2(E,R), 0 },
254 /*4a*/ { "cmovp", true, LONG, op2(E,R), 0 },
255 /*4b*/ { "cmovnp", true, LONG, op2(E,R), 0 },
256 /*4c*/ { "cmovl", true, LONG, op2(E,R), 0 },
257 /*4d*/ { "cmovnl", true, LONG, op2(E,R), 0 },
258 /*4e*/ { "cmovle", true, LONG, op2(E,R), 0 },
259 /*4f*/ { "cmovnle",true, LONG, op2(E,R), 0 },
260 };
261
262 const struct inst db_inst_0f8x[] = {
263 /*80*/ { "jo", false, NONE, op1(Dl), 0 },
264 /*81*/ { "jno", false, NONE, op1(Dl), 0 },
265 /*82*/ { "jb", false, NONE, op1(Dl), 0 },
266 /*83*/ { "jnb", false, NONE, op1(Dl), 0 },
267 /*84*/ { "jz", false, NONE, op1(Dl), 0 },
268 /*85*/ { "jnz", false, NONE, op1(Dl), 0 },
269 /*86*/ { "jbe", false, NONE, op1(Dl), 0 },
270 /*87*/ { "jnbe", false, NONE, op1(Dl), 0 },
271
272 /*88*/ { "js", false, NONE, op1(Dl), 0 },
273 /*89*/ { "jns", false, NONE, op1(Dl), 0 },
274 /*8a*/ { "jp", false, NONE, op1(Dl), 0 },
275 /*8b*/ { "jnp", false, NONE, op1(Dl), 0 },
276 /*8c*/ { "jl", false, NONE, op1(Dl), 0 },
277 /*8d*/ { "jnl", false, NONE, op1(Dl), 0 },
278 /*8e*/ { "jle", false, NONE, op1(Dl), 0 },
279 /*8f*/ { "jnle", false, NONE, op1(Dl), 0 },
280 };
281
282 const struct inst db_inst_0f9x[] = {
283 /*90*/ { "seto", true, NONE, op1(Eb), 0 },
284 /*91*/ { "setno", true, NONE, op1(Eb), 0 },
285 /*92*/ { "setb", true, NONE, op1(Eb), 0 },
286 /*93*/ { "setnb", true, NONE, op1(Eb), 0 },
287 /*94*/ { "setz", true, NONE, op1(Eb), 0 },
288 /*95*/ { "setnz", true, NONE, op1(Eb), 0 },
289 /*96*/ { "setbe", true, NONE, op1(Eb), 0 },
290 /*97*/ { "setnbe",true, NONE, op1(Eb), 0 },
291
292 /*98*/ { "sets", true, NONE, op1(Eb), 0 },
293 /*99*/ { "setns", true, NONE, op1(Eb), 0 },
294 /*9a*/ { "setp", true, NONE, op1(Eb), 0 },
295 /*9b*/ { "setnp", true, NONE, op1(Eb), 0 },
296 /*9c*/ { "setl", true, NONE, op1(Eb), 0 },
297 /*9d*/ { "setnl", true, NONE, op1(Eb), 0 },
298 /*9e*/ { "setle", true, NONE, op1(Eb), 0 },
299 /*9f*/ { "setnle",true, NONE, op1(Eb), 0 },
300 };
301
302 const struct inst db_inst_0fax[] = {
303 /*a0*/ { "push", false, NONE, op1(Si), 0 },
304 /*a1*/ { "pop", false, NONE, op1(Si), 0 },
305 /*a2*/ { "cpuid", false, NONE, 0, 0 },
306 /*a3*/ { "bt", true, LONG, op2(R,E), 0 },
307 /*a4*/ { "shld", true, LONG, op3(Ib,R,E), 0 },
308 /*a5*/ { "shld", true, LONG, op3(CL,R,E), 0 },
309 /*a6*/ { NULL, true, NONE, 0, db_GrpC },
310 /*a7*/ { NULL, true, NONE, 0, db_GrpB },
311
312 /*a8*/ { "push", false, NONE, op1(Si), 0 },
313 /*a9*/ { "pop", false, NONE, op1(Si), 0 },
314 /*aa*/ { "rsm", false, NONE, 0, 0 },
315 /*ab*/ { "bts", true, LONG, op2(R,E), 0 },
316 /*ac*/ { "shrd", true, LONG, op3(Ib,R,E), 0 },
317 /*ad*/ { "shrd", true, LONG, op3(CL,R,E), 0 },
318 /*ae*/ { "", true, RDEP, op1(E), db_Grp9 },
319 /*af*/ { "imul", true, LONG, op2(E,R), 0 },
320 };
321
322 const struct inst db_inst_0fbx[] = {
323 /*b0*/ { "cmpxchg",true, BYTE, op2(R, E), 0 },
324 /*b1*/ { "cmpxchg",true, LONG, op2(R, E), 0 },
325 /*b2*/ { "lss", true, LONG, op2(E, R), 0 },
326 /*b3*/ { "btr", true, LONG, op2(R, E), 0 },
327 /*b4*/ { "lfs", true, LONG, op2(E, R), 0 },
328 /*b5*/ { "lgs", true, LONG, op2(E, R), 0 },
329 /*b6*/ { "movzb", true, LONG, op2(E, R), 0 },
330 /*b7*/ { "movzw", true, LONG, op2(E, R), 0 },
331
332 /*b8*/ { "", false, NONE, 0, 0 },
333 /*b9*/ { "", false, NONE, 0, 0 },
334 /*ba*/ { NULL, true, LONG, op2(Ib, E), db_Grp8 },
335 /*bb*/ { "btc", true, LONG, op2(R, E), 0 },
336 /*bc*/ { "bsf", true, LONG, op2(E, R), 0 },
337 /*bd*/ { "bsr", true, LONG, op2(E, R), 0 },
338 /*be*/ { "movsb", true, LONG, op2(E, R), 0 },
339 /*bf*/ { "movsw", true, LONG, op2(E, R), 0 },
340 };
341
342 const struct inst db_inst_0fcx[] = {
343 /*c0*/ { "xadd", true, BYTE, op2(R, E), 0 },
344 /*c1*/ { "xadd", true, LONG, op2(R, E), 0 },
345 /*c2*/ { "", false, NONE, 0, 0 },
346 /*c3*/ { "", false, NONE, 0, 0 },
347 /*c4*/ { "", false, NONE, 0, 0 },
348 /*c5*/ { "", false, NONE, 0, 0 },
349 /*c6*/ { "", false, NONE, 0, 0 },
350 /*c7*/ { NULL, true, NONE, op1(E), db_GrpA },
351
352 /*c8*/ { "bswap", false, LONG, op1(Ril), 0 },
353 /*c9*/ { "bswap", false, LONG, op1(Ril), 0 },
354 /*ca*/ { "bswap", false, LONG, op1(Ril), 0 },
355 /*cb*/ { "bswap", false, LONG, op1(Ril), 0 },
356 /*cc*/ { "bswap", false, LONG, op1(Ril), 0 },
357 /*cd*/ { "bswap", false, LONG, op1(Ril), 0 },
358 /*ce*/ { "bswap", false, LONG, op1(Ril), 0 },
359 /*cf*/ { "bswap", false, LONG, op1(Ril), 0 },
360 };
361
362 const struct inst * const db_inst_0f[] = {
363 db_inst_0f0x,
364 NULL,
365 db_inst_0f2x,
366 db_inst_0f3x,
367 db_inst_0f4x,
368 NULL,
369 NULL,
370 NULL,
371 db_inst_0f8x,
372 db_inst_0f9x,
373 db_inst_0fax,
374 db_inst_0fbx,
375 db_inst_0fcx,
376 NULL,
377 NULL,
378 NULL
379 };
380
381 const char * const db_Esc92[] = {
382 "fnop", "", "", "", "", "", "", ""
383 };
384 const char * const db_Esc93[] = {
385 "", "", "", "", "", "", "", ""
386 };
387 const char * const db_Esc94[] = {
388 "fchs", "fabs", "", "", "ftst", "fxam", "", ""
389 };
390 const char * const db_Esc95[] = {
391 "fld1", "fldl2t","fldl2e","fldpi","fldlg2","fldln2","fldz",""
392 };
393 const char * const db_Esc96[] = {
394 "f2xm1","fyl2x","fptan","fpatan","fxtract","fprem1","fdecstp",
395 "fincstp"
396 };
397 const char * const db_Esc97[] = {
398 "fprem","fyl2xp1","fsqrt","fsincos","frndint","fscale","fsin","fcos"
399 };
400
401 const char * const db_Esca4[] = {
402 "", "fucompp","", "", "", "", "", ""
403 };
404
405 const char * const db_Escb4[] = {
406 "", "", "fnclex","fninit","", "", "", ""
407 };
408
409 const char * const db_Esce3[] = {
410 "", "fcompp","", "", "", "", "", ""
411 };
412
413 const char * const db_Escf4[] = {
414 "fnstsw","", "", "", "", "", "", ""
415 };
416
417 const struct finst db_Esc8[] = {
418 /*0*/ { "fadd", SNGL, op2(STI,ST), 0 },
419 /*1*/ { "fmul", SNGL, op2(STI,ST), 0 },
420 /*2*/ { "fcom", SNGL, op2(STI,ST), 0 },
421 /*3*/ { "fcomp", SNGL, op2(STI,ST), 0 },
422 /*4*/ { "fsub", SNGL, op2(STI,ST), 0 },
423 /*5*/ { "fsubr", SNGL, op2(STI,ST), 0 },
424 /*6*/ { "fdiv", SNGL, op2(STI,ST), 0 },
425 /*7*/ { "fdivr", SNGL, op2(STI,ST), 0 },
426 };
427
428 const struct finst db_Esc9[] = {
429 /*0*/ { "fld", SNGL, op1(STI), 0 },
430 /*1*/ { "", NONE, op1(STI), "fxch" },
431 /*2*/ { "fst", SNGL, op1(X), db_Esc92 },
432 /*3*/ { "fstp", SNGL, op1(X), db_Esc93 },
433 /*4*/ { "fldenv", NONE, op1(X), db_Esc94 },
434 /*5*/ { "fldcw", NONE, op1(X), db_Esc95 },
435 /*6*/ { "fnstenv",NONE, op1(X), db_Esc96 },
436 /*7*/ { "fnstcw", NONE, op1(X), db_Esc97 },
437 };
438
439 const struct finst db_Esca[] = {
440 /*0*/ { "fiadd", WORD, 0, 0 },
441 /*1*/ { "fimul", WORD, 0, 0 },
442 /*2*/ { "ficom", WORD, 0, 0 },
443 /*3*/ { "ficomp", WORD, 0, 0 },
444 /*4*/ { "fisub", WORD, op1(X), db_Esca4 },
445 /*5*/ { "fisubr", WORD, 0, 0 },
446 /*6*/ { "fidiv", WORD, 0, 0 },
447 /*7*/ { "fidivr", WORD, 0, 0 }
448 };
449
450 const struct finst db_Escb[] = {
451 /*0*/ { "fild", WORD, 0, 0 },
452 /*1*/ { "", NONE, 0, 0 },
453 /*2*/ { "fist", WORD, 0, 0 },
454 /*3*/ { "fistp", WORD, 0, 0 },
455 /*4*/ { "", WORD, op1(X), db_Escb4 },
456 /*5*/ { "fld", EXTR, 0, 0 },
457 /*6*/ { "", WORD, 0, 0 },
458 /*7*/ { "fstp", EXTR, 0, 0 },
459 };
460
461 const struct finst db_Escc[] = {
462 /*0*/ { "fadd", DBLR, op2(ST,STI), 0 },
463 /*1*/ { "fmul", DBLR, op2(ST,STI), 0 },
464 /*2*/ { "fcom", DBLR, op2(ST,STI), 0 },
465 /*3*/ { "fcomp", DBLR, op2(ST,STI), 0 },
466 /*4*/ { "fsub", DBLR, op2(ST,STI), "fsubr" },
467 /*5*/ { "fsubr", DBLR, op2(ST,STI), "fsub" },
468 /*6*/ { "fdiv", DBLR, op2(ST,STI), "fdivr" },
469 /*7*/ { "fdivr", DBLR, op2(ST,STI), "fdiv" },
470 };
471
472 const struct finst db_Escd[] = {
473 /*0*/ { "fld", DBLR, op1(STI), "ffree" },
474 /*1*/ { "", NONE, 0, 0 },
475 /*2*/ { "fst", DBLR, op1(STI), 0 },
476 /*3*/ { "fstp", DBLR, op1(STI), 0 },
477 /*4*/ { "frstor", NONE, op1(STI), "fucom" },
478 /*5*/ { "", NONE, op1(STI), "fucomp" },
479 /*6*/ { "fnsave", NONE, 0, 0 },
480 /*7*/ { "fnstsw", NONE, 0, 0 },
481 };
482
483 const struct finst db_Esce[] = {
484 /*0*/ { "fiadd", LONG, op2(ST,STI), "faddp" },
485 /*1*/ { "fimul", LONG, op2(ST,STI), "fmulp" },
486 /*2*/ { "ficom", LONG, 0, 0 },
487 /*3*/ { "ficomp", LONG, op1(X), db_Esce3 },
488 /*4*/ { "fisub", LONG, op2(ST,STI), "fsubrp" },
489 /*5*/ { "fisubr", LONG, op2(ST,STI), "fsubp" },
490 /*6*/ { "fidiv", LONG, op2(ST,STI), "fdivrp" },
491 /*7*/ { "fidivr", LONG, op2(ST,STI), "fdivp" },
492 };
493
494 const struct finst db_Escf[] = {
495 /*0*/ { "fild", LONG, 0, 0 },
496 /*1*/ { "", LONG, 0, 0 },
497 /*2*/ { "fist", LONG, 0, 0 },
498 /*3*/ { "fistp", LONG, 0, 0 },
499 /*4*/ { "fbld", NONE, op1(XA), db_Escf4 },
500 /*5*/ { "fld", QUAD, 0, 0 },
501 /*6*/ { "fbstp", NONE, 0, 0 },
502 /*7*/ { "fstp", QUAD, 0, 0 },
503 };
504
505 const struct finst * const db_Esc_inst[] = {
506 db_Esc8, db_Esc9, db_Esca, db_Escb,
507 db_Escc, db_Escd, db_Esce, db_Escf
508 };
509
510 const char * const db_Grp1[] = {
511 "add",
512 "or",
513 "adc",
514 "sbb",
515 "and",
516 "sub",
517 "xor",
518 "cmp"
519 };
520
521 const char * const db_Grp2[] = {
522 "rol",
523 "ror",
524 "rcl",
525 "rcr",
526 "shl",
527 "shr",
528 "shl",
529 "sar"
530 };
531
532 const struct inst db_Grp3[] = {
533 { "test", true, NONE, op2(I,E), 0 },
534 { "test", true, NONE, op2(I,E), 0 },
535 { "not", true, NONE, op1(E), 0 },
536 { "neg", true, NONE, op1(E), 0 },
537 { "mul", true, NONE, op2(E,A), 0 },
538 { "imul", true, NONE, op2(E,A), 0 },
539 { "div", true, NONE, op2(E,A), 0 },
540 { "idiv", true, NONE, op2(E,A), 0 },
541 };
542
543 const struct inst db_Grp4[] = {
544 { "inc", true, BYTE, op1(E), 0 },
545 { "dec", true, BYTE, op1(E), 0 },
546 { "", true, NONE, 0, 0 },
547 { "", true, NONE, 0, 0 },
548 { "", true, NONE, 0, 0 },
549 { "", true, NONE, 0, 0 },
550 { "", true, NONE, 0, 0 },
551 { "", true, NONE, 0, 0 }
552 };
553
554 const struct inst db_Grp5[] = {
555 { "inc", true, LONG, op1(E), 0 },
556 { "dec", true, LONG, op1(E), 0 },
557 { "call", true, NONE, op1(Eind),0 },
558 { "lcall", true, NONE, op1(Eind),0 },
559 { "jmp", true, NONE, op1(Eind),0 },
560 { "ljmp", true, NONE, op1(Eind),0 },
561 { "push", true, LONG, op1(E), 0 },
562 { "", true, NONE, 0, 0 }
563 };
564
565 const struct inst db_inst_table[256] = {
566 /*00*/ { "add", true, BYTE, op2(R, E), 0 },
567 /*01*/ { "add", true, LONG, op2(R, E), 0 },
568 /*02*/ { "add", true, BYTE, op2(E, R), 0 },
569 /*03*/ { "add", true, LONG, op2(E, R), 0 },
570 /*04*/ { "add", false, BYTE, op2(Is, A), 0 },
571 /*05*/ { "add", false, LONG, op2(Is, A), 0 },
572 /*06*/ { "push", false, NONE, op1(Si), 0 },
573 /*07*/ { "pop", false, NONE, op1(Si), 0 },
574
575 /*08*/ { "or", true, BYTE, op2(R, E), 0 },
576 /*09*/ { "or", true, LONG, op2(R, E), 0 },
577 /*0a*/ { "or", true, BYTE, op2(E, R), 0 },
578 /*0b*/ { "or", true, LONG, op2(E, R), 0 },
579 /*0c*/ { "or", false, BYTE, op2(I, A), 0 },
580 /*0d*/ { "or", false, LONG, op2(I, A), 0 },
581 /*0e*/ { "push", false, NONE, op1(Si), 0 },
582 /*0f*/ { "", false, NONE, 0, 0 },
583
584 /*10*/ { "adc", true, BYTE, op2(R, E), 0 },
585 /*11*/ { "adc", true, LONG, op2(R, E), 0 },
586 /*12*/ { "adc", true, BYTE, op2(E, R), 0 },
587 /*13*/ { "adc", true, LONG, op2(E, R), 0 },
588 /*14*/ { "adc", false, BYTE, op2(Is, A), 0 },
589 /*15*/ { "adc", false, LONG, op2(Is, A), 0 },
590 /*16*/ { "push", false, NONE, op1(Si), 0 },
591 /*17*/ { "pop", false, NONE, op1(Si), 0 },
592
593 /*18*/ { "sbb", true, BYTE, op2(R, E), 0 },
594 /*19*/ { "sbb", true, LONG, op2(R, E), 0 },
595 /*1a*/ { "sbb", true, BYTE, op2(E, R), 0 },
596 /*1b*/ { "sbb", true, LONG, op2(E, R), 0 },
597 /*1c*/ { "sbb", false, BYTE, op2(Is, A), 0 },
598 /*1d*/ { "sbb", false, LONG, op2(Is, A), 0 },
599 /*1e*/ { "push", false, NONE, op1(Si), 0 },
600 /*1f*/ { "pop", false, NONE, op1(Si), 0 },
601
602 /*20*/ { "and", true, BYTE, op2(R, E), 0 },
603 /*21*/ { "and", true, LONG, op2(R, E), 0 },
604 /*22*/ { "and", true, BYTE, op2(E, R), 0 },
605 /*23*/ { "and", true, LONG, op2(E, R), 0 },
606 /*24*/ { "and", false, BYTE, op2(I, A), 0 },
607 /*25*/ { "and", false, LONG, op2(I, A), 0 },
608 /*26*/ { "", false, NONE, 0, 0 },
609 /*27*/ { "daa", false, NONE, 0, 0 },
610
611 /*28*/ { "sub", true, BYTE, op2(R, E), 0 },
612 /*29*/ { "sub", true, LONG, op2(R, E), 0 },
613 /*2a*/ { "sub", true, BYTE, op2(E, R), 0 },
614 /*2b*/ { "sub", true, LONG, op2(E, R), 0 },
615 /*2c*/ { "sub", false, BYTE, op2(I, A), 0 },
616 /*2d*/ { "sub", false, LONG, op2(Is, A), 0 },
617 /*2e*/ { "", false, NONE, 0, 0 },
618 /*2f*/ { "das", false, NONE, 0, 0 },
619
620 /*30*/ { "xor", true, BYTE, op2(R, E), 0 },
621 /*31*/ { "xor", true, LONG, op2(R, E), 0 },
622 /*32*/ { "xor", true, BYTE, op2(E, R), 0 },
623 /*33*/ { "xor", true, LONG, op2(E, R), 0 },
624 /*34*/ { "xor", false, BYTE, op2(I, A), 0 },
625 /*35*/ { "xor", false, LONG, op2(I, A), 0 },
626 /*36*/ { "", false, NONE, 0, 0 },
627 /*37*/ { "aaa", false, NONE, 0, 0 },
628
629 /*38*/ { "cmp", true, BYTE, op2(R, E), 0 },
630 /*39*/ { "cmp", true, LONG, op2(R, E), 0 },
631 /*3a*/ { "cmp", true, BYTE, op2(E, R), 0 },
632 /*3b*/ { "cmp", true, LONG, op2(E, R), 0 },
633 /*3c*/ { "cmp", false, BYTE, op2(Is, A), 0 },
634 /*3d*/ { "cmp", false, LONG, op2(Is, A), 0 },
635 /*3e*/ { "", false, NONE, 0, 0 },
636 /*3f*/ { "aas", false, NONE, 0, 0 },
637
638 /*40*/ { "inc", false, LONG, op1(Ri), 0 },
639 /*41*/ { "inc", false, LONG, op1(Ri), 0 },
640 /*42*/ { "inc", false, LONG, op1(Ri), 0 },
641 /*43*/ { "inc", false, LONG, op1(Ri), 0 },
642 /*44*/ { "inc", false, LONG, op1(Ri), 0 },
643 /*45*/ { "inc", false, LONG, op1(Ri), 0 },
644 /*46*/ { "inc", false, LONG, op1(Ri), 0 },
645 /*47*/ { "inc", false, LONG, op1(Ri), 0 },
646
647 /*48*/ { "dec", false, LONG, op1(Ri), 0 },
648 /*49*/ { "dec", false, LONG, op1(Ri), 0 },
649 /*4a*/ { "dec", false, LONG, op1(Ri), 0 },
650 /*4b*/ { "dec", false, LONG, op1(Ri), 0 },
651 /*4c*/ { "dec", false, LONG, op1(Ri), 0 },
652 /*4d*/ { "dec", false, LONG, op1(Ri), 0 },
653 /*4e*/ { "dec", false, LONG, op1(Ri), 0 },
654 /*4f*/ { "dec", false, LONG, op1(Ri), 0 },
655
656 /*50*/ { "push", false, LONG, op1(Ri), 0 },
657 /*51*/ { "push", false, LONG, op1(Ri), 0 },
658 /*52*/ { "push", false, LONG, op1(Ri), 0 },
659 /*53*/ { "push", false, LONG, op1(Ri), 0 },
660 /*54*/ { "push", false, LONG, op1(Ri), 0 },
661 /*55*/ { "push", false, LONG, op1(Ri), 0 },
662 /*56*/ { "push", false, LONG, op1(Ri), 0 },
663 /*57*/ { "push", false, LONG, op1(Ri), 0 },
664
665 /*58*/ { "pop", false, LONG, op1(Ri), 0 },
666 /*59*/ { "pop", false, LONG, op1(Ri), 0 },
667 /*5a*/ { "pop", false, LONG, op1(Ri), 0 },
668 /*5b*/ { "pop", false, LONG, op1(Ri), 0 },
669 /*5c*/ { "pop", false, LONG, op1(Ri), 0 },
670 /*5d*/ { "pop", false, LONG, op1(Ri), 0 },
671 /*5e*/ { "pop", false, LONG, op1(Ri), 0 },
672 /*5f*/ { "pop", false, LONG, op1(Ri), 0 },
673
674 /*60*/ { "pusha", false, LONG, 0, 0 },
675 /*61*/ { "popa", false, LONG, 0, 0 },
676 /*62*/ { "bound", true, LONG, op2(E, R), 0 },
677 /*63*/ { "arpl", true, NONE, op2(Ew,Rw), 0 },
678 /*64*/ { "", false, NONE, 0, 0 },
679 /*65*/ { "", false, NONE, 0, 0 },
680 /*66*/ { "", false, NONE, 0, 0 },
681 /*67*/ { "", false, NONE, 0, 0 },
682
683 /*68*/ { "push", false, LONG, op1(I), 0 },
684 /*69*/ { "imul", true, LONG, op3(I,E,R), 0 },
685 /*6a*/ { "push", false, LONG, op1(Ib), 0 },
686 /*6b*/ { "imul", true, LONG, op3(Ibs,E,R),0 },
687 /*6c*/ { "ins", false, BYTE, op2(DX, DI), 0 },
688 /*6d*/ { "ins", false, LONG, op2(DX, DI), 0 },
689 /*6e*/ { "outs", false, BYTE, op2(SI, DX), 0 },
690 /*6f*/ { "outs", false, LONG, op2(SI, DX), 0 },
691
692 /*70*/ { "jo", false, NONE, op1(Db), 0 },
693 /*71*/ { "jno", false, NONE, op1(Db), 0 },
694 /*72*/ { "jb", false, NONE, op1(Db), 0 },
695 /*73*/ { "jnb", false, NONE, op1(Db), 0 },
696 /*74*/ { "jz", false, NONE, op1(Db), 0 },
697 /*75*/ { "jnz", false, NONE, op1(Db), 0 },
698 /*76*/ { "jbe", false, NONE, op1(Db), 0 },
699 /*77*/ { "jnbe", false, NONE, op1(Db), 0 },
700
701 /*78*/ { "js", false, NONE, op1(Db), 0 },
702 /*79*/ { "jns", false, NONE, op1(Db), 0 },
703 /*7a*/ { "jp", false, NONE, op1(Db), 0 },
704 /*7b*/ { "jnp", false, NONE, op1(Db), 0 },
705 /*7c*/ { "jl", false, NONE, op1(Db), 0 },
706 /*7d*/ { "jnl", false, NONE, op1(Db), 0 },
707 /*7e*/ { "jle", false, NONE, op1(Db), 0 },
708 /*7f*/ { "jnle", false, NONE, op1(Db), 0 },
709
710 /*80*/ { NULL, true, BYTE, op2(I, E), db_Grp1 },
711 /*81*/ { NULL, true, LONG, op2(I, E), db_Grp1 },
712 /*82*/ { NULL, true, BYTE, op2(I,E), db_Grp1 },
713 /*83*/ { NULL, true, LONG, op2(Ibs,E), db_Grp1 },
714 /*84*/ { "test", true, BYTE, op2(R, E), 0 },
715 /*85*/ { "test", true, LONG, op2(R, E), 0 },
716 /*86*/ { "xchg", true, BYTE, op2(R, E), 0 },
717 /*87*/ { "xchg", true, LONG, op2(R, E), 0 },
718
719 /*88*/ { "mov", true, BYTE, op2(R, E), 0 },
720 /*89*/ { "mov", true, LONG, op2(R, E), 0 },
721 /*8a*/ { "mov", true, BYTE, op2(E, R), 0 },
722 /*8b*/ { "mov", true, LONG, op2(E, R), 0 },
723 /*8c*/ { "mov", true, NONE, op2(S, Ew), 0 },
724 /*8d*/ { "lea", true, LONG, op2(E, R), 0 },
725 /*8e*/ { "mov", true, NONE, op2(Ew, S), 0 },
726 /*8f*/ { "pop", true, LONG, op1(E), 0 },
727
728 /*90*/ { "nop", false, NONE, 0, 0 },
729 /*91*/ { "xchg", false, LONG, op2(A, Ri), 0 },
730 /*92*/ { "xchg", false, LONG, op2(A, Ri), 0 },
731 /*93*/ { "xchg", false, LONG, op2(A, Ri), 0 },
732 /*94*/ { "xchg", false, LONG, op2(A, Ri), 0 },
733 /*95*/ { "xchg", false, LONG, op2(A, Ri), 0 },
734 /*96*/ { "xchg", false, LONG, op2(A, Ri), 0 },
735 /*97*/ { "xchg", false, LONG, op2(A, Ri), 0 },
736
737 /*98*/ { "cbw", false, SDEP, 0, "cwde" }, /* cbw/cwde */
738 /*99*/ { "cwd", false, SDEP, 0, "cdq" }, /* cwd/cdq */
739 /*9a*/ { "lcall", false, NONE, op1(OS), 0 },
740 /*9b*/ { "wait", false, NONE, 0, 0 },
741 /*9c*/ { "pushf", false, LONG, 0, 0 },
742 /*9d*/ { "popf", false, LONG, 0, 0 },
743 /*9e*/ { "sahf", false, NONE, 0, 0 },
744 /*9f*/ { "lahf", false, NONE, 0, 0 },
745
746 /*a0*/ { "mov", false, BYTE, op2(O, A), 0 },
747 /*a1*/ { "mov", false, LONG, op2(O, A), 0 },
748 /*a2*/ { "mov", false, BYTE, op2(A, O), 0 },
749 /*a3*/ { "mov", false, LONG, op2(A, O), 0 },
750 /*a4*/ { "movs", false, BYTE, op2(SI,DI), 0 },
751 /*a5*/ { "movs", false, LONG, op2(SI,DI), 0 },
752 /*a6*/ { "cmps", false, BYTE, op2(SI,DI), 0 },
753 /*a7*/ { "cmps", false, LONG, op2(SI,DI), 0 },
754
755 /*a8*/ { "test", false, BYTE, op2(I, A), 0 },
756 /*a9*/ { "test", false, LONG, op2(I, A), 0 },
757 /*aa*/ { "stos", false, BYTE, op1(DI), 0 },
758 /*ab*/ { "stos", false, LONG, op1(DI), 0 },
759 /*ac*/ { "lods", false, BYTE, op1(SI), 0 },
760 /*ad*/ { "lods", false, LONG, op1(SI), 0 },
761 /*ae*/ { "scas", false, BYTE, op1(SI), 0 },
762 /*af*/ { "scas", false, LONG, op1(SI), 0 },
763
764 /*b0*/ { "mov", false, BYTE, op2(I, Ri), 0 },
765 /*b1*/ { "mov", false, BYTE, op2(I, Ri), 0 },
766 /*b2*/ { "mov", false, BYTE, op2(I, Ri), 0 },
767 /*b3*/ { "mov", false, BYTE, op2(I, Ri), 0 },
768 /*b4*/ { "mov", false, BYTE, op2(I, Ri), 0 },
769 /*b5*/ { "mov", false, BYTE, op2(I, Ri), 0 },
770 /*b6*/ { "mov", false, BYTE, op2(I, Ri), 0 },
771 /*b7*/ { "mov", false, BYTE, op2(I, Ri), 0 },
772
773 /*b8*/ { "mov", false, LONG, op2(I, Ri), 0 },
774 /*b9*/ { "mov", false, LONG, op2(I, Ri), 0 },
775 /*ba*/ { "mov", false, LONG, op2(I, Ri), 0 },
776 /*bb*/ { "mov", false, LONG, op2(I, Ri), 0 },
777 /*bc*/ { "mov", false, LONG, op2(I, Ri), 0 },
778 /*bd*/ { "mov", false, LONG, op2(I, Ri), 0 },
779 /*be*/ { "mov", false, LONG, op2(I, Ri), 0 },
780 /*bf*/ { "mov", false, LONG, op2(I, Ri), 0 },
781
782 /*c0*/ { NULL, true, BYTE, op2(Ib, E), db_Grp2 },
783 /*c1*/ { NULL, true, LONG, op2(Ib, E), db_Grp2 },
784 /*c2*/ { "ret", false, NONE, op1(Iw), 0 },
785 /*c3*/ { "ret", false, NONE, 0, 0 },
786 /*c4*/ { "les", true, LONG, op2(E, R), 0 },
787 /*c5*/ { "lds", true, LONG, op2(E, R), 0 },
788 /*c6*/ { "mov", true, BYTE, op2(I, E), 0 },
789 /*c7*/ { "mov", true, LONG, op2(I, E), 0 },
790
791 /*c8*/ { "enter", false, NONE, op2(Ib, Iw), 0 },
792 /*c9*/ { "leave", false, NONE, 0, 0 },
793 /*ca*/ { "lret", false, NONE, op1(Iw), 0 },
794 /*cb*/ { "lret", false, NONE, 0, 0 },
795 /*cc*/ { "int", false, NONE, op1(o3), 0 },
796 /*cd*/ { "int", false, NONE, op1(Ib), 0 },
797 /*ce*/ { "into", false, NONE, 0, 0 },
798 /*cf*/ { "iret", false, NONE, 0, 0 },
799
800 /*d0*/ { NULL, true, BYTE, op2(o1, E), db_Grp2 },
801 /*d1*/ { NULL, true, LONG, op2(o1, E), db_Grp2 },
802 /*d2*/ { NULL, true, BYTE, op2(CL, E), db_Grp2 },
803 /*d3*/ { NULL, true, LONG, op2(CL, E), db_Grp2 },
804 /*d4*/ { "aam", true, NONE, op1(Iba), 0 },
805 /*d5*/ { "aad", true, NONE, op1(Iba), 0 },
806 /*d6*/ { ".byte\t0xd6",false, NONE, 0, 0 },
807 /*d7*/ { "xlat", false, BYTE, op1(BX), 0 },
808
809 /*d8*/ { "", true, NONE, 0, db_Esc8 },
810 /*d9*/ { "", true, NONE, 0, db_Esc9 },
811 /*da*/ { "", true, NONE, 0, db_Esca },
812 /*db*/ { "", true, NONE, 0, db_Escb },
813 /*dc*/ { "", true, NONE, 0, db_Escc },
814 /*dd*/ { "", true, NONE, 0, db_Escd },
815 /*de*/ { "", true, NONE, 0, db_Esce },
816 /*df*/ { "", true, NONE, 0, db_Escf },
817
818 /*e0*/ { "loopne",false, NONE, op1(Db), 0 },
819 /*e1*/ { "loope", false, NONE, op1(Db), 0 },
820 /*e2*/ { "loop", false, NONE, op1(Db), 0 },
821 /*e3*/ { "jcxz", false, SDEP, op1(Db), "jecxz" },
822 /*e4*/ { "in", false, BYTE, op2(Ib, A), 0 },
823 /*e5*/ { "in", false, LONG, op2(Ib, A) , 0 },
824 /*e6*/ { "out", false, BYTE, op2(A, Ib), 0 },
825 /*e7*/ { "out", false, LONG, op2(A, Ib) , 0 },
826
827 /*e8*/ { "call", false, NONE, op1(Dl), 0 },
828 /*e9*/ { "jmp", false, NONE, op1(Dl), 0 },
829 /*ea*/ { "ljmp", false, NONE, op1(OS), 0 },
830 /*eb*/ { "jmp", false, NONE, op1(Db), 0 },
831 /*ec*/ { "in", false, BYTE, op2(DX, A), 0 },
832 /*ed*/ { "in", false, LONG, op2(DX, A) , 0 },
833 /*ee*/ { "out", false, BYTE, op2(A, DX), 0 },
834 /*ef*/ { "out", false, LONG, op2(A, DX) , 0 },
835
836 /*f0*/ { "", false, NONE, 0, 0 },
837 /*f1*/ { "", false, NONE, 0, 0 },
838 /*f2*/ { "", false, NONE, 0, 0 },
839 /*f3*/ { "", false, NONE, 0, 0 },
840 /*f4*/ { "hlt", false, NONE, 0, 0 },
841 /*f5*/ { "cmc", false, NONE, 0, 0 },
842 /*f6*/ { "", true, BYTE, 0, db_Grp3 },
843 /*f7*/ { "", true, LONG, 0, db_Grp3 },
844
845 /*f8*/ { "clc", false, NONE, 0, 0 },
846 /*f9*/ { "stc", false, NONE, 0, 0 },
847 /*fa*/ { "cli", false, NONE, 0, 0 },
848 /*fb*/ { "sti", false, NONE, 0, 0 },
849 /*fc*/ { "cld", false, NONE, 0, 0 },
850 /*fd*/ { "std", false, NONE, 0, 0 },
851 /*fe*/ { "", true, RDEP, 0, db_Grp4 },
852 /*ff*/ { "", true, RDEP, 0, db_Grp5 },
853 };
854
855 const struct inst db_bad_inst =
856 { "???", false, NONE, 0, 0 }
857 ;
858
859 #define f_mod(byte) ((byte)>>6)
860 #define f_reg(byte) (((byte)>>3)&0x7)
861 #define f_rm(byte) ((byte)&0x7)
862
863 #define sib_ss(byte) ((byte)>>6)
864 #define sib_index(byte) (((byte)>>3)&0x7)
865 #define sib_base(byte) ((byte)&0x7)
866
867 struct i_addr {
868 int is_reg; /* if reg, reg number is in 'disp' */
869 int disp;
870 const char * base;
871 const char * index;
872 int ss;
873 };
874
875 const char * const db_index_reg_16[8] = {
876 "%bx,%si",
877 "%bx,%di",
878 "%bp,%si",
879 "%bp,%di",
880 "%si",
881 "%di",
882 "%bp",
883 "%bx"
884 };
885
886 const char * const db_reg[3][8] = {
887 { "%al", "%cl", "%dl", "%bl", "%ah", "%ch", "%dh", "%bh" },
888 { "%ax", "%cx", "%dx", "%bx", "%sp", "%bp", "%si", "%di" },
889 { "%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi" }
890 };
891
892 const char * const db_seg_reg[8] = {
893 "%es", "%cs", "%ss", "%ds", "%fs", "%gs", "", ""
894 };
895
896 /*
897 * lengths for size attributes
898 */
899 const int db_lengths[] = {
900 1, /* BYTE */
901 2, /* WORD */
902 4, /* LONG */
903 8, /* QUAD */
904 4, /* SNGL */
905 8, /* DBLR */
906 10, /* EXTR */
907 };
908
909 #define get_value_inc(result, loc, size, is_signed) \
910 do { \
911 result = db_get_value((loc), (size), (is_signed)); \
912 (loc) += (size); \
913 } while (0)
914
915
916 db_addr_t db_read_address(db_addr_t, int, int, struct i_addr *);
917 void db_print_address(const char *, int, struct i_addr *);
918 db_addr_t db_disasm_esc(db_addr_t, int, int, int, const char *);
919
920 /*
921 * Read address at location and return updated location.
922 */
923 db_addr_t
db_read_address(db_addr_t loc,int short_addr,int regmodrm,struct i_addr * addrp)924 db_read_address(db_addr_t loc, int short_addr, int regmodrm, struct i_addr *addrp)
925 /* addrp: out */
926 {
927 int mod, rm, sib, index, disp;
928
929 mod = f_mod(regmodrm);
930 rm = f_rm(regmodrm);
931
932 if (mod == 3) {
933 addrp->is_reg = true;
934 addrp->disp = rm;
935 return (loc);
936 }
937 addrp->is_reg = false;
938 addrp->index = 0;
939
940 if (short_addr) {
941 addrp->index = 0;
942 addrp->ss = 0;
943 switch (mod) {
944 case 0:
945 if (rm == 6) {
946 get_value_inc(disp, loc, 2, false);
947 addrp->disp = disp;
948 addrp->base = 0;
949 } else {
950 addrp->disp = 0;
951 addrp->base = db_index_reg_16[rm];
952 }
953 break;
954 case 1:
955 get_value_inc(disp, loc, 1, true);
956 addrp->disp = disp;
957 addrp->base = db_index_reg_16[rm];
958 break;
959 case 2:
960 get_value_inc(disp, loc, 2, false);
961 addrp->disp = disp;
962 addrp->base = db_index_reg_16[rm];
963 break;
964 }
965 } else {
966 if (mod != 3 && rm == 4) {
967 get_value_inc(sib, loc, 1, false);
968 rm = sib_base(sib);
969 index = sib_index(sib);
970 if (index != 4)
971 addrp->index = db_reg[LONG][index];
972 addrp->ss = sib_ss(sib);
973 }
974
975 switch (mod) {
976 case 0:
977 if (rm == 5) {
978 get_value_inc(addrp->disp, loc, 4, false);
979 addrp->base = 0;
980 } else {
981 addrp->disp = 0;
982 addrp->base = db_reg[LONG][rm];
983 }
984 break;
985 case 1:
986 get_value_inc(disp, loc, 1, true);
987 addrp->disp = disp;
988 addrp->base = db_reg[LONG][rm];
989 break;
990 case 2:
991 get_value_inc(disp, loc, 4, false);
992 addrp->disp = disp;
993 addrp->base = db_reg[LONG][rm];
994 break;
995 }
996 }
997 return (loc);
998 }
999
1000 void
db_print_address(const char * seg,int size,struct i_addr * addrp)1001 db_print_address(const char * seg, int size, struct i_addr *addrp)
1002 {
1003 if (addrp->is_reg) {
1004 db_printf("%s", db_reg[size][addrp->disp]);
1005 return;
1006 }
1007
1008 if (seg)
1009 db_printf("%s:", seg);
1010
1011 db_printsym((db_addr_t)addrp->disp, DB_STGY_ANY, db_printf);
1012 if (addrp->base != 0 || addrp->index != 0) {
1013 db_printf("(");
1014 if (addrp->base)
1015 db_printf("%s", addrp->base);
1016 if (addrp->index)
1017 db_printf(",%s,%d", addrp->index, 1<<addrp->ss);
1018 db_printf(")");
1019 }
1020 }
1021
1022 /*
1023 * Disassemble floating-point ("escape") instruction
1024 * and return updated location.
1025 */
1026 db_addr_t
db_disasm_esc(db_addr_t loc,int inst,int short_addr,int size,const char * seg)1027 db_disasm_esc(db_addr_t loc, int inst, int short_addr, int size, const char *seg)
1028 {
1029 int regmodrm;
1030 const struct finst *fp;
1031 int mod;
1032 struct i_addr address;
1033 const char * name;
1034
1035 get_value_inc(regmodrm, loc, 1, false);
1036 fp = &db_Esc_inst[inst - 0xd8][f_reg(regmodrm)];
1037 mod = f_mod(regmodrm);
1038 if (mod != 3) {
1039 if (*fp->f_name == '\0') {
1040 db_printf("<bad instruction>");
1041 return (loc);
1042 }
1043
1044 /*
1045 * Normal address modes.
1046 */
1047 loc = db_read_address(loc, short_addr, regmodrm, &address);
1048 db_printf("%s", fp->f_name);
1049 switch (fp->f_size) {
1050 case SNGL:
1051 db_printf("s");
1052 break;
1053 case DBLR:
1054 db_printf("l");
1055 break;
1056 case EXTR:
1057 db_printf("t");
1058 break;
1059 case WORD:
1060 db_printf("s");
1061 break;
1062 case LONG:
1063 db_printf("l");
1064 break;
1065 case QUAD:
1066 db_printf("q");
1067 break;
1068 default:
1069 break;
1070 }
1071 db_printf("\t");
1072 db_print_address(seg, BYTE, &address);
1073 } else {
1074 /*
1075 * 'reg-reg' - special formats
1076 */
1077 switch (fp->f_rrmode) {
1078 case op2(ST,STI):
1079 name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1080 db_printf("%s\t%%st,%%st(%d)", name, f_rm(regmodrm));
1081 break;
1082 case op2(STI,ST):
1083 name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1084 db_printf("%s\t%%st(%d),%%st", name, f_rm(regmodrm));
1085 break;
1086 case op1(STI):
1087 name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1088 db_printf("%s\t%%st(%d)", name, f_rm(regmodrm));
1089 break;
1090 case op1(X):
1091 name = ((const char *const*)fp->f_rrname)[f_rm(regmodrm)];
1092 if (*name == '\0')
1093 goto bad;
1094 db_printf("%s", name);
1095 break;
1096 case op1(XA):
1097 db_printf("%s\t%%ax",
1098 ((const char *const*)fp->f_rrname)[f_rm(regmodrm)]);
1099 break;
1100 default:
1101 bad:
1102 db_printf("<bad instruction>");
1103 break;
1104 }
1105 }
1106
1107 return (loc);
1108 }
1109
1110 /*
1111 * Disassemble instruction at 'loc'. 'altfmt' specifies an
1112 * (optional) alternate format. Return address of start of
1113 * next instruction.
1114 */
1115 db_addr_t
db_disasm(db_addr_t loc,bool altfmt)1116 db_disasm(db_addr_t loc, bool altfmt)
1117 {
1118 int inst;
1119 int size;
1120 int short_addr;
1121 const char * seg;
1122 const struct inst * ip;
1123 const char * i_name;
1124 int i_size;
1125 int i_mode;
1126 int regmodrm = 0;
1127 bool first;
1128 int displ;
1129 int prefix;
1130 int imm;
1131 int imm2;
1132 int len;
1133 struct i_addr address;
1134
1135 get_value_inc(inst, loc, 1, false);
1136 short_addr = false;
1137 size = LONG;
1138 seg = 0;
1139
1140 /*
1141 * Get prefixes
1142 */
1143 prefix = true;
1144 do {
1145 switch (inst) {
1146 case 0x66: /* data16 */
1147 size = WORD;
1148 break;
1149 case 0x67:
1150 short_addr = true;
1151 break;
1152 case 0x26:
1153 seg = "%es";
1154 break;
1155 case 0x36:
1156 seg = "%ss";
1157 break;
1158 case 0x2e:
1159 seg = "%cs";
1160 break;
1161 case 0x3e:
1162 seg = "%ds";
1163 break;
1164 case 0x64:
1165 seg = "%fs";
1166 break;
1167 case 0x65:
1168 seg = "%gs";
1169 break;
1170 case 0xf0:
1171 db_printf("lock ");
1172 break;
1173 case 0xf2:
1174 db_printf("repne ");
1175 break;
1176 case 0xf3:
1177 db_printf("repe "); /* XXX repe VS rep */
1178 break;
1179 default:
1180 prefix = false;
1181 break;
1182 }
1183 if (prefix)
1184 get_value_inc(inst, loc, 1, false);
1185 } while (prefix);
1186
1187 if (inst >= 0xd8 && inst <= 0xdf) {
1188 loc = db_disasm_esc(loc, inst, short_addr, size, seg);
1189 db_printf("\n");
1190 return (loc);
1191 }
1192
1193 if (inst == 0x0f) {
1194 get_value_inc(inst, loc, 1, false);
1195 ip = db_inst_0f[inst>>4];
1196 if (ip == 0)
1197 ip = &db_bad_inst;
1198 else
1199 ip = &ip[inst&0xf];
1200 } else {
1201 ip = &db_inst_table[inst];
1202 }
1203
1204 if (ip->i_has_modrm) {
1205 get_value_inc(regmodrm, loc, 1, false);
1206 loc = db_read_address(loc, short_addr, regmodrm, &address);
1207 }
1208
1209 i_name = ip->i_name;
1210 i_size = ip->i_size;
1211 i_mode = ip->i_mode;
1212
1213 if (i_size == RDEP) {
1214 /* sub-table to handle dependency on reg from ModR/M byte */
1215 ip = (const struct inst *)ip->i_extra;
1216 ip = &ip[f_reg(regmodrm)];
1217 i_name = ip->i_name;
1218 i_mode = ip->i_mode;
1219 i_size = ip->i_size;
1220 } else if (i_name == NULL) {
1221 i_name = ((const char *const*)ip->i_extra)[f_reg(regmodrm)];
1222 } else if (ip->i_extra == (const char *)db_Grp3) {
1223 ip = (const struct inst *)ip->i_extra;
1224 ip = &ip[f_reg(regmodrm)];
1225 i_name = ip->i_name;
1226 i_mode = ip->i_mode;
1227 }
1228
1229 /* ModR/M-specific operation? */
1230 if ((i_mode & 0xFF) == MEx) {
1231 if (f_mod(regmodrm) != 3)
1232 i_mode = op1(E);
1233 else {
1234 /* unknown extension? */
1235 if (f_rm(regmodrm) > (i_mode >> 8))
1236 i_name = "";
1237 else {
1238 /* skip to the specific op */
1239 int i = f_rm(regmodrm);
1240 i_name = ip->i_extra;
1241 while (i-- > 0)
1242 while (*i_name++)
1243 ;
1244 }
1245 i_mode = 0;
1246 }
1247 }
1248
1249 if (i_size == SDEP) {
1250 if (size == WORD)
1251 db_printf("%s", i_name);
1252 else
1253 db_printf("%s", (const char *)ip->i_extra);
1254 } else {
1255 db_printf("%s", i_name);
1256 if (i_size != NONE) {
1257 if (i_size == BYTE) {
1258 db_printf("b");
1259 size = BYTE;
1260 } else if (i_size == WORD) {
1261 db_printf("w");
1262 size = WORD;
1263 } else if (size == WORD) {
1264 db_printf("w");
1265 } else {
1266 db_printf("l");
1267 }
1268 }
1269 }
1270 db_printf("\t");
1271 for (first = true;
1272 i_mode != 0;
1273 i_mode >>= 8, first = false) {
1274 char tbuf[24];
1275
1276 if (!first)
1277 db_printf(",");
1278
1279 switch (i_mode & 0xFF) {
1280 case E:
1281 db_print_address(seg, size, &address);
1282 break;
1283 case Eind:
1284 db_printf("*");
1285 db_print_address(seg, size, &address);
1286 break;
1287 case El:
1288 db_print_address(seg, LONG, &address);
1289 break;
1290 case Ew:
1291 db_print_address(seg, WORD, &address);
1292 break;
1293 case Eb:
1294 db_print_address(seg, BYTE, &address);
1295 break;
1296 case R:
1297 db_printf("%s", db_reg[size][f_reg(regmodrm)]);
1298 break;
1299 case Rw:
1300 db_printf("%s", db_reg[WORD][f_reg(regmodrm)]);
1301 break;
1302 case Ri:
1303 db_printf("%s", db_reg[size][f_rm(inst)]);
1304 break;
1305 case Ril:
1306 db_printf("%s", db_reg[LONG][f_rm(inst)]);
1307 break;
1308 case S:
1309 db_printf("%s", db_seg_reg[f_reg(regmodrm)]);
1310 break;
1311 case Si:
1312 db_printf("%s", db_seg_reg[f_reg(inst)]);
1313 break;
1314 case A:
1315 db_printf("%s", db_reg[size][0]); /* acc */
1316 break;
1317 case BX:
1318 if (seg)
1319 db_printf("%s:", seg);
1320 db_printf("(%s)", short_addr ? "%bx" : "%ebx");
1321 break;
1322 case CL:
1323 db_printf("%%cl");
1324 break;
1325 case DX:
1326 db_printf("%%dx");
1327 break;
1328 case SI:
1329 if (seg)
1330 db_printf("%s:", seg);
1331 db_printf("(%s)", short_addr ? "%si" : "%esi");
1332 break;
1333 case DI:
1334 db_printf("%%es:(%s)", short_addr ? "%di" : "%edi");
1335 break;
1336 case CR:
1337 db_printf("%%cr%d", f_reg(regmodrm));
1338 break;
1339 case DR:
1340 db_printf("%%dr%d", f_reg(regmodrm));
1341 break;
1342 case TR:
1343 db_printf("%%tr%d", f_reg(regmodrm));
1344 break;
1345 case I:
1346 len = db_lengths[size];
1347 get_value_inc(imm, loc, len, false);/* unsigned */
1348 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1349 db_printf("$%s", tbuf);
1350 break;
1351 case Is:
1352 len = db_lengths[size];
1353 get_value_inc(imm, loc, len, true); /* signed */
1354 db_format_radix(tbuf, 24, imm, true);
1355 db_printf("$%s", tbuf);
1356 break;
1357 case Ib:
1358 get_value_inc(imm, loc, 1, false); /* unsigned */
1359 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1360 db_printf("$%s", tbuf);
1361 break;
1362 case Iba:
1363 get_value_inc(imm, loc, 1, false);
1364 if (imm != 0x0a) {
1365 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1366 db_printf("$%s", tbuf);
1367 }
1368 break;
1369 case Ibs:
1370 get_value_inc(imm, loc, 1, true); /* signed */
1371 db_format_radix(tbuf, 24, imm, true);
1372 db_printf("$%s", tbuf);
1373 break;
1374 case Iw:
1375 get_value_inc(imm, loc, 2, false); /* unsigned */
1376 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1377 db_printf("$%s", tbuf);
1378 break;
1379 case Il:
1380 get_value_inc(imm, loc, 4, false);
1381 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1382 db_printf("$%s", tbuf);
1383 break;
1384 case O:
1385 if (short_addr)
1386 get_value_inc(displ, loc, 2, true);
1387 else
1388 get_value_inc(displ, loc, 4, true);
1389 if (seg) {
1390 db_format_radix(tbuf, 24, displ, true);
1391 db_printf("%s:%s", seg, tbuf);
1392 } else
1393 db_printsym((db_addr_t)displ, DB_STGY_ANY,
1394 db_printf);
1395 break;
1396 case Db:
1397 get_value_inc(displ, loc, 1, true);
1398 db_printsym((db_addr_t)(displ + loc), DB_STGY_XTRN,
1399 db_printf);
1400 break;
1401 case Dl:
1402 get_value_inc(displ, loc, 4, true);
1403 db_printsym((db_addr_t)(displ + loc), DB_STGY_XTRN,
1404 db_printf);
1405 break;
1406 case o1:
1407 db_printf("$1");
1408 break;
1409 case o3:
1410 db_printf("$3");
1411 break;
1412 case OS:
1413 get_value_inc(imm, loc, 4, false); /* offset */
1414 db_format_radix(tbuf, 24, (unsigned int)imm, true);
1415 db_printf("$%s", tbuf);
1416 get_value_inc(imm2, loc, 2, false); /* segment */
1417 db_format_radix(tbuf, 24, (unsigned int)imm2, true);
1418 db_printf(",%s", tbuf);
1419 break;
1420 }
1421 }
1422
1423 db_printf("\n");
1424 return (loc);
1425 }
1426