db_disasm.c revision 8876 
1/*
2 * Mach Operating System
3 * Copyright (c) 1991,1990 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS
13 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
19 *  School of Computer Science
20 *  Carnegie Mellon University
21 *  Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie the
24 * rights to redistribute these changes.
25 *
26 *	$Id: db_disasm.c,v 1.8 1995/01/29 02:38:15 bde Exp $
27 */
28
29/*
30 * Instruction disassembler.
31 */
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/proc.h>
35#include <ddb/ddb.h>
36
37#include <ddb/db_access.h>
38#include <ddb/db_sym.h>
39
40/*
41 * Size attributes
42 */
43#define	BYTE	0
44#define	WORD	1
45#define	LONG	2
46#define	QUAD	3
47#define	SNGL	4
48#define	DBLR	5
49#define	EXTR	6
50#define	SDEP	7
51#define	NONE	8
52
53/*
54 * Addressing modes
55 */
56#define	E	1			/* general effective address */
57#define	Eind	2			/* indirect address (jump, call) */
58#define	Ew	3			/* address, word size */
59#define	Eb	4			/* address, byte size */
60#define	R	5			/* register, in 'reg' field */
61#define	Rw	6			/* word register, in 'reg' field */
62#define	Ri	7			/* register in instruction */
63#define	S	8			/* segment reg, in 'reg' field */
64#define	Si	9			/* segment reg, in instruction */
65#define	A	10			/* accumulator */
66#define	BX	11			/* (bx) */
67#define	CL	12			/* cl, for shifts */
68#define	DX	13			/* dx, for IO */
69#define	SI	14			/* si */
70#define	DI	15			/* di */
71#define	CR	16			/* control register */
72#define	DR	17			/* debug register */
73#define	TR	18			/* test register */
74#define	I	19			/* immediate, unsigned */
75#define	Is	20			/* immediate, signed */
76#define	Ib	21			/* byte immediate, unsigned */
77#define	Ibs	22			/* byte immediate, signed */
78#define	Iw	23			/* word immediate, unsigned */
79#define	Il	24			/* long immediate */
80#define	O	25			/* direct address */
81#define	Db	26			/* byte displacement from EIP */
82#define	Dl	27			/* long displacement from EIP */
83#define	o1	28			/* constant 1 */
84#define	o3	29			/* constant 3 */
85#define	OS	30			/* immediate offset/segment */
86#define	ST	31			/* FP stack top */
87#define	STI	32			/* FP stack */
88#define	X	33			/* extended FP op */
89#define	XA	34			/* for 'fstcw %ax' */
90
91struct inst {
92	char *	i_name;			/* name */
93	short	i_has_modrm;		/* has regmodrm byte */
94	short	i_size;			/* operand size */
95	int	i_mode;			/* addressing modes */
96	char *	i_extra;		/* pointer to extra opcode table */
97};
98
99#define	op1(x)		(x)
100#define	op2(x,y)	((x)|((y)<<8))
101#define	op3(x,y,z)	((x)|((y)<<8)|((z)<<16))
102
103struct finst {
104	char *	f_name;			/* name for memory instruction */
105	int	f_size;			/* size for memory instruction */
106	int	f_rrmode;		/* mode for rr instruction */
107	char *	f_rrname;		/* name for rr instruction
108					   (or pointer to table) */
109};
110
111char *	db_Grp6[] = {
112	"sldt",
113	"str",
114	"lldt",
115	"ltr",
116	"verr",
117	"verw",
118	"",
119	""
120};
121
122char *	db_Grp7[] = {
123	"sgdt",
124	"sidt",
125	"lgdt",
126	"lidt",
127	"smsw",
128	"",
129	"lmsw",
130	"invlpg"
131};
132
133char *	db_Grp8[] = {
134	"",
135	"",
136	"",
137	"",
138	"bt",
139	"bts",
140	"btr",
141	"btc"
142};
143
144struct inst db_inst_0f0x[] = {
145/*00*/	{ "",	   TRUE,  NONE,  op1(Ew),     (char *)db_Grp6 },
146/*01*/	{ "",	   TRUE,  NONE,  op1(Ew),     (char *)db_Grp7 },
147/*02*/	{ "lar",   TRUE,  LONG,  op2(E,R),    0 },
148/*03*/	{ "lsl",   TRUE,  LONG,  op2(E,R),    0 },
149/*04*/	{ "",      FALSE, NONE,  0,	      0 },
150/*05*/	{ "",      FALSE, NONE,  0,	      0 },
151/*06*/	{ "clts",  FALSE, NONE,  0,	      0 },
152/*07*/	{ "",      FALSE, NONE,  0,	      0 },
153
154/*08*/	{ "invd",  FALSE, NONE,  0,	      0 },
155/*09*/	{ "wbinvd",FALSE, NONE,  0,	      0 },
156/*0a*/	{ "",      FALSE, NONE,  0,	      0 },
157/*0b*/	{ "",      FALSE, NONE,  0,	      0 },
158/*0c*/	{ "",      FALSE, NONE,  0,	      0 },
159/*0d*/	{ "",      FALSE, NONE,  0,	      0 },
160/*0e*/	{ "",      FALSE, NONE,  0,	      0 },
161/*0f*/	{ "",      FALSE, NONE,  0,	      0 },
162};
163
164struct inst	db_inst_0f2x[] = {
165/*20*/	{ "mov",   TRUE,  LONG,  op2(CR,E),   0 }, /* use E for reg */
166/*21*/	{ "mov",   TRUE,  LONG,  op2(DR,E),   0 }, /* since mod == 11 */
167/*22*/	{ "mov",   TRUE,  LONG,  op2(E,CR),   0 },
168/*23*/	{ "mov",   TRUE,  LONG,  op2(E,DR),   0 },
169/*24*/	{ "mov",   TRUE,  LONG,  op2(TR,E),   0 },
170/*25*/	{ "",      FALSE, NONE,  0,	      0 },
171/*26*/	{ "mov",   TRUE,  LONG,  op2(E,TR),   0 },
172/*27*/	{ "",      FALSE, NONE,  0,	      0 },
173
174/*28*/	{ "",      FALSE, NONE,  0,	      0 },
175/*29*/	{ "",      FALSE, NONE,  0,	      0 },
176/*2a*/	{ "",      FALSE, NONE,  0,	      0 },
177/*2b*/	{ "",      FALSE, NONE,  0,	      0 },
178/*2c*/	{ "",      FALSE, NONE,  0,	      0 },
179/*2d*/	{ "",      FALSE, NONE,  0,	      0 },
180/*2e*/	{ "",      FALSE, NONE,  0,	      0 },
181/*2f*/	{ "",      FALSE, NONE,  0,	      0 },
182};
183
184struct inst	db_inst_0f8x[] = {
185/*80*/	{ "jo",    FALSE, NONE,  op1(Dl),     0 },
186/*81*/	{ "jno",   FALSE, NONE,  op1(Dl),     0 },
187/*82*/	{ "jb",    FALSE, NONE,  op1(Dl),     0 },
188/*83*/	{ "jnb",   FALSE, NONE,  op1(Dl),     0 },
189/*84*/	{ "jz",    FALSE, NONE,  op1(Dl),     0 },
190/*85*/	{ "jnz",   FALSE, NONE,  op1(Dl),     0 },
191/*86*/	{ "jbe",   FALSE, NONE,  op1(Dl),     0 },
192/*87*/	{ "jnbe",  FALSE, NONE,  op1(Dl),     0 },
193
194/*88*/	{ "js",    FALSE, NONE,  op1(Dl),     0 },
195/*89*/	{ "jns",   FALSE, NONE,  op1(Dl),     0 },
196/*8a*/	{ "jp",    FALSE, NONE,  op1(Dl),     0 },
197/*8b*/	{ "jnp",   FALSE, NONE,  op1(Dl),     0 },
198/*8c*/	{ "jl",    FALSE, NONE,  op1(Dl),     0 },
199/*8d*/	{ "jnl",   FALSE, NONE,  op1(Dl),     0 },
200/*8e*/	{ "jle",   FALSE, NONE,  op1(Dl),     0 },
201/*8f*/	{ "jnle",  FALSE, NONE,  op1(Dl),     0 },
202};
203
204struct inst	db_inst_0f9x[] = {
205/*90*/	{ "seto",  TRUE,  NONE,  op1(Eb),     0 },
206/*91*/	{ "setno", TRUE,  NONE,  op1(Eb),     0 },
207/*92*/	{ "setb",  TRUE,  NONE,  op1(Eb),     0 },
208/*93*/	{ "setnb", TRUE,  NONE,  op1(Eb),     0 },
209/*94*/	{ "setz",  TRUE,  NONE,  op1(Eb),     0 },
210/*95*/	{ "setnz", TRUE,  NONE,  op1(Eb),     0 },
211/*96*/	{ "setbe", TRUE,  NONE,  op1(Eb),     0 },
212/*97*/	{ "setnbe",TRUE,  NONE,  op1(Eb),     0 },
213
214/*98*/	{ "sets",  TRUE,  NONE,  op1(Eb),     0 },
215/*99*/	{ "setns", TRUE,  NONE,  op1(Eb),     0 },
216/*9a*/	{ "setp",  TRUE,  NONE,  op1(Eb),     0 },
217/*9b*/	{ "setnp", TRUE,  NONE,  op1(Eb),     0 },
218/*9c*/	{ "setl",  TRUE,  NONE,  op1(Eb),     0 },
219/*9d*/	{ "setnl", TRUE,  NONE,  op1(Eb),     0 },
220/*9e*/	{ "setle", TRUE,  NONE,  op1(Eb),     0 },
221/*9f*/	{ "setnle",TRUE,  NONE,  op1(Eb),     0 },
222};
223
224struct inst	db_inst_0fax[] = {
225/*a0*/	{ "push",  FALSE, NONE,  op1(Si),     0 },
226/*a1*/	{ "pop",   FALSE, NONE,  op1(Si),     0 },
227/*a2*/	{ "",      FALSE, NONE,  0,	      0 },
228/*a3*/	{ "bt",    TRUE,  LONG,  op2(E,R),    0 },
229/*a4*/	{ "shld",  TRUE,  LONG,  op3(Ib,E,R), 0 },
230/*a5*/	{ "shld",  TRUE,  LONG,  op3(CL,E,R), 0 },
231/*a6*/	{ "",      FALSE, NONE,  0,	      0 },
232/*a7*/	{ "",      FALSE, NONE,  0,	      0 },
233
234/*a8*/	{ "push",  FALSE, NONE,  op1(Si),     0 },
235/*a9*/	{ "pop",   FALSE, NONE,  op1(Si),     0 },
236/*aa*/	{ "",      FALSE, NONE,  0,	      0 },
237/*ab*/	{ "bts",   TRUE,  LONG,  op2(E,R),    0 },
238/*ac*/	{ "shrd",  TRUE,  LONG,  op3(Ib,E,R), 0 },
239/*ad*/	{ "shrd",  TRUE,  LONG,  op3(CL,E,R), 0 },
240/*a6*/	{ "",      FALSE, NONE,  0,	      0 },
241/*a7*/	{ "imul",  TRUE,  LONG,  op2(E,R),    0 },
242};
243
244struct inst	db_inst_0fbx[] = {
245/*b0*/	{ "",      FALSE, NONE,  0,	      0 },
246/*b1*/	{ "",      FALSE, NONE,  0,	      0 },
247/*b2*/	{ "lss",   TRUE,  LONG,  op2(E, R),   0 },
248/*b3*/	{ "bts",   TRUE,  LONG,  op2(R, E),   0 },
249/*b4*/	{ "lfs",   TRUE,  LONG,  op2(E, R),   0 },
250/*b5*/	{ "lgs",   TRUE,  LONG,  op2(E, R),   0 },
251/*b6*/	{ "movzb", TRUE,  LONG,  op2(E, R),   0 },
252/*b7*/	{ "movzw", TRUE,  LONG,  op2(E, R),   0 },
253
254/*b8*/	{ "",      FALSE, NONE,  0,	      0 },
255/*b9*/	{ "",      FALSE, NONE,  0,	      0 },
256/*ba*/	{ "",      TRUE,  LONG,  op2(Ib, E),  (char *)db_Grp8 },
257/*bb*/	{ "btc",   TRUE,  LONG,  op2(R, E),   0 },
258/*bc*/	{ "bsf",   TRUE,  LONG,  op2(E, R),   0 },
259/*bd*/	{ "bsr",   TRUE,  LONG,  op2(E, R),   0 },
260/*be*/	{ "movsb", TRUE,  LONG,  op2(E, R),   0 },
261/*bf*/	{ "movsw", TRUE,  LONG,  op2(E, R),   0 },
262};
263
264struct inst	db_inst_0fcx[] = {
265/*c0*/	{ "xadd",  TRUE,  BYTE,	 op2(R, E),   0 },
266/*c1*/	{ "xadd",  TRUE,  LONG,	 op2(R, E),   0 },
267/*c2*/	{ "",	   FALSE, NONE,	 0,	      0 },
268/*c3*/	{ "",	   FALSE, NONE,	 0,	      0 },
269/*c4*/	{ "",	   FALSE, NONE,	 0,	      0 },
270/*c5*/	{ "",	   FALSE, NONE,	 0,	      0 },
271/*c6*/	{ "",	   FALSE, NONE,	 0,	      0 },
272/*c7*/	{ "",	   FALSE, NONE,	 0,	      0 },
273/*c8*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
274/*c9*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
275/*ca*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
276/*cb*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
277/*cc*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
278/*cd*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
279/*ce*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
280/*cf*/	{ "bswap", FALSE, LONG,  op1(Ri),     0 },
281};
282
283struct inst	db_inst_0fdx[] = {
284/*c0*/	{ "cmpxchg",TRUE, BYTE,	 op2(R, E),   0 },
285/*c1*/	{ "cmpxchg",TRUE, LONG,	 op2(R, E),   0 },
286/*c2*/	{ "",	   FALSE, NONE,	 0,	      0 },
287/*c3*/	{ "",	   FALSE, NONE,	 0,	      0 },
288/*c4*/	{ "",	   FALSE, NONE,	 0,	      0 },
289/*c5*/	{ "",	   FALSE, NONE,	 0,	      0 },
290/*c6*/	{ "",	   FALSE, NONE,	 0,	      0 },
291/*c7*/	{ "",	   FALSE, NONE,	 0,	      0 },
292/*c8*/	{ "",	   FALSE, NONE,	 0,	      0 },
293/*c9*/	{ "",	   FALSE, NONE,	 0,	      0 },
294/*ca*/	{ "",	   FALSE, NONE,	 0,	      0 },
295/*cb*/	{ "",	   FALSE, NONE,	 0,	      0 },
296/*cc*/	{ "",	   FALSE, NONE,	 0,	      0 },
297/*cd*/	{ "",	   FALSE, NONE,	 0,	      0 },
298/*ce*/	{ "",	   FALSE, NONE,	 0,	      0 },
299/*cf*/	{ "",	   FALSE, NONE,	 0,	      0 },
300};
301
302struct inst *db_inst_0f[] = {
303	db_inst_0f0x,
304	0,
305	db_inst_0f2x,
306	0,
307	0,
308	0,
309	0,
310	0,
311	db_inst_0f8x,
312	db_inst_0f9x,
313	db_inst_0fax,
314	db_inst_0fbx,
315	db_inst_0fcx,
316	db_inst_0fdx,
317	0,
318	0
319};
320
321char *	db_Esc92[] = {
322	"fnop",	"",	"",	"",	"",	"",	"",	""
323};
324char *	db_Esc93[] = {
325	"",	"",	"",	"",	"",	"",	"",	""
326};
327char *	db_Esc94[] = {
328	"fchs",	"fabs",	"",	"",	"ftst",	"fxam",	"",	""
329};
330char *	db_Esc95[] = {
331	"fld1",	"fldl2t","fldl2e","fldpi","fldlg2","fldln2","fldz",""
332};
333char *	db_Esc96[] = {
334	"f2xm1","fyl2x","fptan","fpatan","fxtract","fprem1","fdecstp",
335	"fincstp"
336};
337char *	db_Esc97[] = {
338	"fprem","fyl2xp1","fsqrt","fsincos","frndint","fscale","fsin","fcos"
339};
340
341char *	db_Esca4[] = {
342	"",	"fucompp","",	"",	"",	"",	"",	""
343};
344
345char *	db_Escb4[] = {
346	"",	"",	"fnclex","fninit","",	"",	"",	""
347};
348
349char *	db_Esce3[] = {
350	"",	"fcompp","",	"",	"",	"",	"",	""
351};
352
353char *	db_Escf4[] = {
354	"fnstsw","",	"",	"",	"",	"",	"",	""
355};
356
357struct finst db_Esc8[] = {
358/*0*/	{ "fadd",   SNGL,  op2(STI,ST),	0 },
359/*1*/	{ "fmul",   SNGL,  op2(STI,ST),	0 },
360/*2*/	{ "fcom",   SNGL,  op2(STI,ST),	0 },
361/*3*/	{ "fcomp",  SNGL,  op2(STI,ST),	0 },
362/*4*/	{ "fsub",   SNGL,  op2(STI,ST),	0 },
363/*5*/	{ "fsubr",  SNGL,  op2(STI,ST),	0 },
364/*6*/	{ "fdiv",   SNGL,  op2(STI,ST),	0 },
365/*7*/	{ "fdivr",  SNGL,  op2(STI,ST),	0 },
366};
367
368struct finst db_Esc9[] = {
369/*0*/	{ "fld",    SNGL,  op1(STI),	0 },
370/*1*/	{ "",       NONE,  op1(STI),	"fxch" },
371/*2*/	{ "fst",    SNGL,  op1(X),	(char *)db_Esc92 },
372/*3*/	{ "fstp",   SNGL,  op1(X),	(char *)db_Esc93 },
373/*4*/	{ "fldenv", NONE,  op1(X),	(char *)db_Esc94 },
374/*5*/	{ "fldcw",  NONE,  op1(X),	(char *)db_Esc95 },
375/*6*/	{ "fnstenv",NONE,  op1(X),	(char *)db_Esc96 },
376/*7*/	{ "fnstcw", NONE,  op1(X),	(char *)db_Esc97 },
377};
378
379struct finst db_Esca[] = {
380/*0*/	{ "fiadd",  WORD,  0,		0 },
381/*1*/	{ "fimul",  WORD,  0,		0 },
382/*2*/	{ "ficom",  WORD,  0,		0 },
383/*3*/	{ "ficomp", WORD,  0,		0 },
384/*4*/	{ "fisub",  WORD,  op1(X),	(char *)db_Esca4 },
385/*5*/	{ "fisubr", WORD,  0,		0 },
386/*6*/	{ "fidiv",  WORD,  0,		0 },
387/*7*/	{ "fidivr", WORD,  0,		0 }
388};
389
390struct finst db_Escb[] = {
391/*0*/	{ "fild",   WORD,  0,		0 },
392/*1*/	{ "",       NONE,  0,		0 },
393/*2*/	{ "fist",   WORD,  0,		0 },
394/*3*/	{ "fistp",  WORD,  0,		0 },
395/*4*/	{ "",       WORD,  op1(X),	(char *)db_Escb4 },
396/*5*/	{ "fld",    EXTR,  0,		0 },
397/*6*/	{ "",       WORD,  0,		0 },
398/*7*/	{ "fstp",   EXTR,  0,		0 },
399};
400
401struct finst db_Escc[] = {
402/*0*/	{ "fadd",   DBLR,  op2(ST,STI),	0 },
403/*1*/	{ "fmul",   DBLR,  op2(ST,STI),	0 },
404/*2*/	{ "fcom",   DBLR,  op2(ST,STI),	0 },
405/*3*/	{ "fcomp",  DBLR,  op2(ST,STI),	0 },
406/*4*/	{ "fsub",   DBLR,  op2(ST,STI),	"fsubr" },
407/*5*/	{ "fsubr",  DBLR,  op2(ST,STI),	"fsub" },
408/*6*/	{ "fdiv",   DBLR,  op2(ST,STI),	"fdivr" },
409/*7*/	{ "fdivr",  DBLR,  op2(ST,STI),	"fdiv" },
410};
411
412struct finst db_Escd[] = {
413/*0*/	{ "fld",    DBLR,  op1(STI),	"ffree" },
414/*1*/	{ "",       NONE,  0,		0 },
415/*2*/	{ "fst",    DBLR,  op1(STI),	0 },
416/*3*/	{ "fstp",   DBLR,  op1(STI),	0 },
417/*4*/	{ "frstor", NONE,  op1(STI),	"fucom" },
418/*5*/	{ "",       NONE,  op1(STI),	"fucomp" },
419/*6*/	{ "fnsave", NONE,  0,		0 },
420/*7*/	{ "fnstsw", NONE,  0,		0 },
421};
422
423struct finst db_Esce[] = {
424/*0*/	{ "fiadd",  LONG,  op2(ST,STI),	"faddp" },
425/*1*/	{ "fimul",  LONG,  op2(ST,STI),	"fmulp" },
426/*2*/	{ "ficom",  LONG,  0,		0 },
427/*3*/	{ "ficomp", LONG,  op1(X),	(char *)db_Esce3 },
428/*4*/	{ "fisub",  LONG,  op2(ST,STI),	"fsubrp" },
429/*5*/	{ "fisubr", LONG,  op2(ST,STI),	"fsubp" },
430/*6*/	{ "fidiv",  LONG,  op2(ST,STI),	"fdivrp" },
431/*7*/	{ "fidivr", LONG,  op2(ST,STI),	"fdivp" },
432};
433
434struct finst db_Escf[] = {
435/*0*/	{ "fild",   LONG,  0,		0 },
436/*1*/	{ "",       LONG,  0,		0 },
437/*2*/	{ "fist",   LONG,  0,		0 },
438/*3*/	{ "fistp",  LONG,  0,		0 },
439/*4*/	{ "fbld",   NONE,  op1(XA),	(char *)db_Escf4 },
440/*5*/	{ "fld",    QUAD,  0,		0 },
441/*6*/	{ "fbstp",  NONE,  0,		0 },
442/*7*/	{ "fstp",   QUAD,  0,		0 },
443};
444
445struct finst *db_Esc_inst[] = {
446	db_Esc8, db_Esc9, db_Esca, db_Escb,
447	db_Escc, db_Escd, db_Esce, db_Escf
448};
449
450char *	db_Grp1[] = {
451	"add",
452	"or",
453	"adc",
454	"sbb",
455	"and",
456	"sub",
457	"xor",
458	"cmp"
459};
460
461char *	db_Grp2[] = {
462	"rol",
463	"ror",
464	"rcl",
465	"rcr",
466	"shl",
467	"shr",
468	"shl",
469	"sar"
470};
471
472struct inst db_Grp3[] = {
473	{ "test",  TRUE, NONE, op2(I,E), 0 },
474	{ "test",  TRUE, NONE, op2(I,E), 0 },
475	{ "not",   TRUE, NONE, op1(E),   0 },
476	{ "neg",   TRUE, NONE, op1(E),   0 },
477	{ "mul",   TRUE, NONE, op2(E,A), 0 },
478	{ "imul",  TRUE, NONE, op2(E,A), 0 },
479	{ "div",   TRUE, NONE, op2(E,A), 0 },
480	{ "idiv",  TRUE, NONE, op2(E,A), 0 },
481};
482
483struct inst	db_Grp4[] = {
484	{ "inc",   TRUE, BYTE, op1(E),   0 },
485	{ "dec",   TRUE, BYTE, op1(E),   0 },
486	{ "",      TRUE, NONE, 0,	 0 },
487	{ "",      TRUE, NONE, 0,	 0 },
488	{ "",      TRUE, NONE, 0,	 0 },
489	{ "",      TRUE, NONE, 0,	 0 },
490	{ "",      TRUE, NONE, 0,	 0 },
491	{ "",      TRUE, NONE, 0,	 0 }
492};
493
494struct inst	db_Grp5[] = {
495	{ "inc",   TRUE, LONG, op1(E),   0 },
496	{ "dec",   TRUE, LONG, op1(E),   0 },
497	{ "call",  TRUE, NONE, op1(Eind),0 },
498	{ "lcall", TRUE, NONE, op1(Eind),0 },
499	{ "jmp",   TRUE, NONE, op1(Eind),0 },
500	{ "ljmp",  TRUE, NONE, op1(Eind),0 },
501	{ "push",  TRUE, LONG, op1(E),   0 },
502	{ "",      TRUE, NONE, 0,	 0 }
503};
504
505struct inst db_inst_table[256] = {
506/*00*/	{ "add",   TRUE,  BYTE,  op2(R, E),  0 },
507/*01*/	{ "add",   TRUE,  LONG,  op2(R, E),  0 },
508/*02*/	{ "add",   TRUE,  BYTE,  op2(E, R),  0 },
509/*03*/	{ "add",   TRUE,  LONG,  op2(E, R),  0 },
510/*04*/	{ "add",   FALSE, BYTE,  op2(Is, A), 0 },
511/*05*/	{ "add",   FALSE, LONG,  op2(Is, A), 0 },
512/*06*/	{ "push",  FALSE, NONE,  op1(Si),    0 },
513/*07*/	{ "pop",   FALSE, NONE,  op1(Si),    0 },
514
515/*08*/	{ "or",    TRUE,  BYTE,  op2(R, E),  0 },
516/*09*/	{ "or",    TRUE,  LONG,  op2(R, E),  0 },
517/*0a*/	{ "or",    TRUE,  BYTE,  op2(E, R),  0 },
518/*0b*/	{ "or",    TRUE,  LONG,  op2(E, R),  0 },
519/*0c*/	{ "or",    FALSE, BYTE,  op2(I, A),  0 },
520/*0d*/	{ "or",    FALSE, LONG,  op2(I, A),  0 },
521/*0e*/	{ "push",  FALSE, NONE,  op1(Si),    0 },
522/*0f*/	{ "",      FALSE, NONE,  0,	     0 },
523
524/*10*/	{ "adc",   TRUE,  BYTE,  op2(R, E),  0 },
525/*11*/	{ "adc",   TRUE,  LONG,  op2(R, E),  0 },
526/*12*/	{ "adc",   TRUE,  BYTE,  op2(E, R),  0 },
527/*13*/	{ "adc",   TRUE,  LONG,  op2(E, R),  0 },
528/*14*/	{ "adc",   FALSE, BYTE,  op2(Is, A), 0 },
529/*15*/	{ "adc",   FALSE, LONG,  op2(Is, A), 0 },
530/*16*/	{ "push",  FALSE, NONE,  op1(Si),    0 },
531/*17*/	{ "pop",   FALSE, NONE,  op1(Si),    0 },
532
533/*18*/	{ "sbb",   TRUE,  BYTE,  op2(R, E),  0 },
534/*19*/	{ "sbb",   TRUE,  LONG,  op2(R, E),  0 },
535/*1a*/	{ "sbb",   TRUE,  BYTE,  op2(E, R),  0 },
536/*1b*/	{ "sbb",   TRUE,  LONG,  op2(E, R),  0 },
537/*1c*/	{ "sbb",   FALSE, BYTE,  op2(Is, A), 0 },
538/*1d*/	{ "sbb",   FALSE, LONG,  op2(Is, A), 0 },
539/*1e*/	{ "push",  FALSE, NONE,  op1(Si),    0 },
540/*1f*/	{ "pop",   FALSE, NONE,  op1(Si),    0 },
541
542/*20*/	{ "and",   TRUE,  BYTE,  op2(R, E),  0 },
543/*21*/	{ "and",   TRUE,  LONG,  op2(R, E),  0 },
544/*22*/	{ "and",   TRUE,  BYTE,  op2(E, R),  0 },
545/*23*/	{ "and",   TRUE,  LONG,  op2(E, R),  0 },
546/*24*/	{ "and",   FALSE, BYTE,  op2(I, A),  0 },
547/*25*/	{ "and",   FALSE, LONG,  op2(I, A),  0 },
548/*26*/	{ "",      FALSE, NONE,  0,	     0 },
549/*27*/	{ "aaa",   FALSE, NONE,  0,	     0 },
550
551/*28*/	{ "sub",   TRUE,  BYTE,  op2(R, E),  0 },
552/*29*/	{ "sub",   TRUE,  LONG,  op2(R, E),  0 },
553/*2a*/	{ "sub",   TRUE,  BYTE,  op2(E, R),  0 },
554/*2b*/	{ "sub",   TRUE,  LONG,  op2(E, R),  0 },
555/*2c*/	{ "sub",   FALSE, BYTE,  op2(Is, A), 0 },
556/*2d*/	{ "sub",   FALSE, LONG,  op2(Is, A), 0 },
557/*2e*/	{ "",      FALSE, NONE,  0,	     0 },
558/*2f*/	{ "das",   FALSE, NONE,  0,	     0 },
559
560/*30*/	{ "xor",   TRUE,  BYTE,  op2(R, E),  0 },
561/*31*/	{ "xor",   TRUE,  LONG,  op2(R, E),  0 },
562/*32*/	{ "xor",   TRUE,  BYTE,  op2(E, R),  0 },
563/*33*/	{ "xor",   TRUE,  LONG,  op2(E, R),  0 },
564/*34*/	{ "xor",   FALSE, BYTE,  op2(I, A),  0 },
565/*35*/	{ "xor",   FALSE, LONG,  op2(I, A),  0 },
566/*36*/	{ "",      FALSE, NONE,  0,	     0 },
567/*37*/	{ "daa",   FALSE, NONE,  0,	     0 },
568
569/*38*/	{ "cmp",   TRUE,  BYTE,  op2(R, E),  0 },
570/*39*/	{ "cmp",   TRUE,  LONG,  op2(R, E),  0 },
571/*3a*/	{ "cmp",   TRUE,  BYTE,  op2(E, R),  0 },
572/*3b*/	{ "cmp",   TRUE,  LONG,  op2(E, R),  0 },
573/*3c*/	{ "cmp",   FALSE, BYTE,  op2(Is, A), 0 },
574/*3d*/	{ "cmp",   FALSE, LONG,  op2(Is, A), 0 },
575/*3e*/	{ "",      FALSE, NONE,  0,	     0 },
576/*3f*/	{ "aas",   FALSE, NONE,  0,	     0 },
577
578/*40*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
579/*41*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
580/*42*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
581/*43*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
582/*44*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
583/*45*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
584/*46*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
585/*47*/	{ "inc",   FALSE, LONG,  op1(Ri),    0 },
586
587/*48*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
588/*49*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
589/*4a*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
590/*4b*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
591/*4c*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
592/*4d*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
593/*4e*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
594/*4f*/	{ "dec",   FALSE, LONG,  op1(Ri),    0 },
595
596/*50*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
597/*51*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
598/*52*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
599/*53*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
600/*54*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
601/*55*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
602/*56*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
603/*57*/	{ "push",  FALSE, LONG,  op1(Ri),    0 },
604
605/*58*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
606/*59*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
607/*5a*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
608/*5b*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
609/*5c*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
610/*5d*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
611/*5e*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
612/*5f*/	{ "pop",   FALSE, LONG,  op1(Ri),    0 },
613
614/*60*/	{ "pusha", FALSE, LONG,  0,	     0 },
615/*61*/	{ "popa",  FALSE, LONG,  0,	     0 },
616/*62*/  { "bound", TRUE,  LONG,  op2(E, R),  0 },
617/*63*/	{ "arpl",  TRUE,  NONE,  op2(Ew,Rw), 0 },
618
619/*64*/	{ "",      FALSE, NONE,  0,	     0 },
620/*65*/	{ "",      FALSE, NONE,  0,	     0 },
621/*66*/	{ "",      FALSE, NONE,  0,	     0 },
622/*67*/	{ "",      FALSE, NONE,  0,	     0 },
623
624/*68*/	{ "push",  FALSE, LONG,  op1(I),     0 },
625/*69*/  { "imul",  TRUE,  LONG,  op3(I,E,R), 0 },
626/*6a*/	{ "push",  FALSE, LONG,  op1(Ib),    0 },
627/*6b*/  { "imul",  TRUE,  LONG,  op3(Ibs,E,R),0 },
628/*6c*/	{ "ins",   FALSE, BYTE,  op2(DX, DI), 0 },
629/*6d*/	{ "ins",   FALSE, LONG,  op2(DX, DI), 0 },
630/*6e*/	{ "outs",  FALSE, BYTE,  op2(SI, DX), 0 },
631/*6f*/	{ "outs",  FALSE, LONG,  op2(SI, DX), 0 },
632
633/*70*/	{ "jo",    FALSE, NONE,  op1(Db),     0 },
634/*71*/	{ "jno",   FALSE, NONE,  op1(Db),     0 },
635/*72*/	{ "jb",    FALSE, NONE,  op1(Db),     0 },
636/*73*/	{ "jnb",   FALSE, NONE,  op1(Db),     0 },
637/*74*/	{ "jz",    FALSE, NONE,  op1(Db),     0 },
638/*75*/	{ "jnz",   FALSE, NONE,  op1(Db),     0 },
639/*76*/	{ "jbe",   FALSE, NONE,  op1(Db),     0 },
640/*77*/	{ "jnbe",  FALSE, NONE,  op1(Db),     0 },
641
642/*78*/	{ "js",    FALSE, NONE,  op1(Db),     0 },
643/*79*/	{ "jns",   FALSE, NONE,  op1(Db),     0 },
644/*7a*/	{ "jp",    FALSE, NONE,  op1(Db),     0 },
645/*7b*/	{ "jnp",   FALSE, NONE,  op1(Db),     0 },
646/*7c*/	{ "jl",    FALSE, NONE,  op1(Db),     0 },
647/*7d*/	{ "jnl",   FALSE, NONE,  op1(Db),     0 },
648/*7e*/	{ "jle",   FALSE, NONE,  op1(Db),     0 },
649/*7f*/	{ "jnle",  FALSE, NONE,  op1(Db),     0 },
650
651/*80*/  { "",	   TRUE,  BYTE,  op2(I, E),   (char *)db_Grp1 },
652/*81*/  { "",	   TRUE,  LONG,  op2(I, E),   (char *)db_Grp1 },
653/*82*/  { "",	   TRUE,  BYTE,  op2(Is,E),   (char *)db_Grp1 },
654/*83*/  { "",	   TRUE,  LONG,  op2(Ibs,E),  (char *)db_Grp1 },
655/*84*/	{ "test",  TRUE,  BYTE,  op2(R, E),   0 },
656/*85*/	{ "test",  TRUE,  LONG,  op2(R, E),   0 },
657/*86*/	{ "xchg",  TRUE,  BYTE,  op2(R, E),   0 },
658/*87*/	{ "xchg",  TRUE,  LONG,  op2(R, E),   0 },
659
660/*88*/	{ "mov",   TRUE,  BYTE,  op2(R, E),   0 },
661/*89*/	{ "mov",   TRUE,  LONG,  op2(R, E),   0 },
662/*8a*/	{ "mov",   TRUE,  BYTE,  op2(E, R),   0 },
663/*8b*/	{ "mov",   TRUE,  LONG,  op2(E, R),   0 },
664/*8c*/  { "mov",   TRUE,  NONE,  op2(S, Ew),  0 },
665/*8d*/	{ "lea",   TRUE,  LONG,  op2(E, R),   0 },
666/*8e*/	{ "mov",   TRUE,  NONE,  op2(Ew, S),  0 },
667/*8f*/	{ "pop",   TRUE,  LONG,  op1(E),      0 },
668
669/*90*/	{ "nop",   FALSE, NONE,  0,	      0 },
670/*91*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
671/*92*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
672/*93*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
673/*94*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
674/*95*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
675/*96*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
676/*97*/	{ "xchg",  FALSE, LONG,  op2(A, Ri),  0 },
677
678/*98*/	{ "cbw",   FALSE, SDEP,  0,	      "cwde" },	/* cbw/cwde */
679/*99*/	{ "cwd",   FALSE, SDEP,  0,	      "cdq"  },	/* cwd/cdq */
680/*9a*/	{ "lcall", FALSE, NONE,  op1(OS),     0 },
681/*9b*/	{ "wait",  FALSE, NONE,  0,	      0 },
682/*9c*/	{ "pushf", FALSE, LONG,  0,	      0 },
683/*9d*/	{ "popf",  FALSE, LONG,  0,	      0 },
684/*9e*/	{ "sahf",  FALSE, NONE,  0,	      0 },
685/*9f*/	{ "lahf",  FALSE, NONE,  0,	      0 },
686
687/*a0*/	{ "mov",   FALSE, BYTE,  op2(O, A),   0 },
688/*a1*/	{ "mov",   FALSE, LONG,  op2(O, A),   0 },
689/*a2*/	{ "mov",   FALSE, BYTE,  op2(A, O),   0 },
690/*a3*/	{ "mov",   FALSE, LONG,  op2(A, O),   0 },
691/*a4*/	{ "movs",  FALSE, BYTE,  op2(SI,DI),  0 },
692/*a5*/	{ "movs",  FALSE, LONG,  op2(SI,DI),  0 },
693/*a6*/	{ "cmps",  FALSE, BYTE,  op2(SI,DI),  0 },
694/*a7*/	{ "cmps",  FALSE, LONG,  op2(SI,DI),  0 },
695
696/*a8*/	{ "test",  FALSE, BYTE,  op2(I, A),   0 },
697/*a9*/	{ "test",  FALSE, LONG,  op2(I, A),   0 },
698/*aa*/	{ "stos",  FALSE, BYTE,  op1(DI),     0 },
699/*ab*/	{ "stos",  FALSE, LONG,  op1(DI),     0 },
700/*ac*/	{ "lods",  FALSE, BYTE,  op1(SI),     0 },
701/*ad*/	{ "lods",  FALSE, LONG,  op1(SI),     0 },
702/*ae*/	{ "scas",  FALSE, BYTE,  op1(SI),     0 },
703/*af*/	{ "scas",  FALSE, LONG,  op1(SI),     0 },
704
705/*b0*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
706/*b1*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
707/*b2*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
708/*b3*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
709/*b4*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
710/*b5*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
711/*b6*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
712/*b7*/	{ "mov",   FALSE, BYTE,  op2(I, Ri),  0 },
713
714/*b8*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
715/*b9*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
716/*ba*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
717/*bb*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
718/*bc*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
719/*bd*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
720/*be*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
721/*bf*/	{ "mov",   FALSE, LONG,  op2(I, Ri),  0 },
722
723/*c0*/	{ "",	   TRUE,  BYTE,  op2(Ib, E),  (char *)db_Grp2 },
724/*c1*/	{ "",	   TRUE,  LONG,  op2(Ib, E),  (char *)db_Grp2 },
725/*c2*/	{ "ret",   FALSE, NONE,  op1(Iw),     0 },
726/*c3*/	{ "ret",   FALSE, NONE,  0,	      0 },
727/*c4*/	{ "les",   TRUE,  LONG,  op2(E, R),   0 },
728/*c5*/	{ "lds",   TRUE,  LONG,  op2(E, R),   0 },
729/*c6*/	{ "mov",   TRUE,  BYTE,  op2(I, E),   0 },
730/*c7*/	{ "mov",   TRUE,  LONG,  op2(I, E),   0 },
731
732/*c8*/	{ "enter", FALSE, NONE,  op2(Ib, Iw), 0 },
733/*c9*/	{ "leave", FALSE, NONE,  0,           0 },
734/*ca*/	{ "lret",  FALSE, NONE,  op1(Iw),     0 },
735/*cb*/	{ "lret",  FALSE, NONE,  0,	      0 },
736/*cc*/	{ "int",   FALSE, NONE,  op1(o3),     0 },
737/*cd*/	{ "int",   FALSE, NONE,  op1(Ib),     0 },
738/*ce*/	{ "into",  FALSE, NONE,  0,	      0 },
739/*cf*/	{ "iret",  FALSE, NONE,  0,	      0 },
740
741/*d0*/	{ "",	   TRUE,  BYTE,  op2(o1, E),  (char *)db_Grp2 },
742/*d1*/	{ "",	   TRUE,  LONG,  op2(o1, E),  (char *)db_Grp2 },
743/*d2*/	{ "",	   TRUE,  BYTE,  op2(CL, E),  (char *)db_Grp2 },
744/*d3*/	{ "",	   TRUE,  LONG,  op2(CL, E),  (char *)db_Grp2 },
745/*d4*/	{ "aam",   TRUE,  NONE,  0,	      0 },
746/*d5*/	{ "aad",   TRUE,  NONE,  0,	      0 },
747/*d6*/	{ "",      FALSE, NONE,  0,	      0 },
748/*d7*/	{ "xlat",  FALSE, BYTE,  op1(BX),     0 },
749
750/*d8*/  { "",      TRUE,  NONE,  0,	      (char *)db_Esc8 },
751/*d9*/  { "",      TRUE,  NONE,  0,	      (char *)db_Esc9 },
752/*da*/  { "",      TRUE,  NONE,  0,	      (char *)db_Esca },
753/*db*/  { "",      TRUE,  NONE,  0,	      (char *)db_Escb },
754/*dc*/  { "",      TRUE,  NONE,  0,	      (char *)db_Escc },
755/*dd*/  { "",      TRUE,  NONE,  0,	      (char *)db_Escd },
756/*de*/  { "",      TRUE,  NONE,  0,	      (char *)db_Esce },
757/*df*/  { "",      TRUE,  NONE,  0,	      (char *)db_Escf },
758
759/*e0*/	{ "loopne",FALSE, NONE,  op1(Db),     0 },
760/*e1*/	{ "loope", FALSE, NONE,  op1(Db),     0 },
761/*e2*/	{ "loop",  FALSE, NONE,  op1(Db),     0 },
762/*e3*/	{ "jcxz",  FALSE, SDEP,  op1(Db),     "jecxz" },
763/*e4*/	{ "in",    FALSE, BYTE,  op2(Ib, A),  0 },
764/*e5*/	{ "in",    FALSE, LONG,  op2(Ib, A) , 0 },
765/*e6*/	{ "out",   FALSE, BYTE,  op2(A, Ib),  0 },
766/*e7*/	{ "out",   FALSE, LONG,  op2(A, Ib) , 0 },
767
768/*e8*/	{ "call",  FALSE, NONE,  op1(Dl),     0 },
769/*e9*/	{ "jmp",   FALSE, NONE,  op1(Dl),     0 },
770/*ea*/	{ "ljmp",  FALSE, NONE,  op1(OS),     0 },
771/*eb*/	{ "jmp",   FALSE, NONE,  op1(Db),     0 },
772/*ec*/	{ "in",    FALSE, BYTE,  op2(DX, A),  0 },
773/*ed*/	{ "in",    FALSE, LONG,  op2(DX, A) , 0 },
774/*ee*/	{ "out",   FALSE, BYTE,  op2(A, DX),  0 },
775/*ef*/	{ "out",   FALSE, LONG,  op2(A, DX) , 0 },
776
777/*f0*/	{ "",      FALSE, NONE,  0,	     0 },
778/*f1*/	{ "",      FALSE, NONE,  0,	     0 },
779/*f2*/	{ "",      FALSE, NONE,  0,	     0 },
780/*f3*/	{ "",      FALSE, NONE,  0,	     0 },
781/*f4*/	{ "hlt",   FALSE, NONE,  0,	     0 },
782/*f5*/	{ "cmc",   FALSE, NONE,  0,	     0 },
783/*f6*/	{ "",      TRUE,  BYTE,  0,	     (char *)db_Grp3 },
784/*f7*/	{ "",	   TRUE,  LONG,  0,	     (char *)db_Grp3 },
785
786/*f8*/	{ "clc",   FALSE, NONE,  0,	     0 },
787/*f9*/	{ "stc",   FALSE, NONE,  0,	     0 },
788/*fa*/	{ "cli",   FALSE, NONE,  0,	     0 },
789/*fb*/	{ "sti",   FALSE, NONE,  0,	     0 },
790/*fc*/	{ "cld",   FALSE, NONE,  0,	     0 },
791/*fd*/	{ "std",   FALSE, NONE,  0,	     0 },
792/*fe*/	{ "",	   TRUE,  NONE,  0,	     (char *)db_Grp4 },
793/*ff*/	{ "",	   TRUE,  NONE,  0,	     (char *)db_Grp5 },
794};
795
796struct inst	db_bad_inst =
797	{ "???",   FALSE, NONE,  0,	      0 }
798;
799
800#define	f_mod(byte)	((byte)>>6)
801#define	f_reg(byte)	(((byte)>>3)&0x7)
802#define	f_rm(byte)	((byte)&0x7)
803
804#define	sib_ss(byte)	((byte)>>6)
805#define	sib_index(byte)	(((byte)>>3)&0x7)
806#define	sib_base(byte)	((byte)&0x7)
807
808struct i_addr {
809	int		is_reg;	/* if reg, reg number is in 'disp' */
810	int		disp;
811	char *		base;
812	char *		index;
813	int		ss;
814};
815
816char *	db_index_reg_16[8] = {
817	"%bx,%si",
818	"%bx,%di",
819	"%bp,%si",
820	"%bp,%di",
821	"%si",
822	"%di",
823	"%bp",
824	"%bx"
825};
826
827char *	db_reg[3][8] = {
828	"%al",  "%cl",  "%dl",  "%bl",  "%ah",  "%ch",  "%dh",  "%bh",
829	"%ax",  "%cx",  "%dx",  "%bx",  "%sp",  "%bp",  "%si",  "%di",
830	"%eax", "%ecx", "%edx", "%ebx", "%esp", "%ebp", "%esi", "%edi"
831};
832
833char *	db_seg_reg[8] = {
834	"%es", "%cs", "%ss", "%ds", "%fs", "%gs", "", ""
835};
836
837/*
838 * lengths for size attributes
839 */
840int db_lengths[] = {
841	1,	/* BYTE */
842	2,	/* WORD */
843	4,	/* LONG */
844	8,	/* QUAD */
845	4,	/* SNGL */
846	8,	/* DBLR */
847	10,	/* EXTR */
848};
849
850#define	get_value_inc(result, loc, size, is_signed) \
851	result = db_get_value((loc), (size), (is_signed)); \
852	(loc) += (size);
853
854/*
855 * Read address at location and return updated location.
856 */
857db_addr_t
858db_read_address(loc, short_addr, regmodrm, addrp)
859	db_addr_t	loc;
860	int		short_addr;
861	int		regmodrm;
862	struct i_addr	*addrp;		/* out */
863{
864	int		mod, rm, sib, index, disp;
865
866	mod = f_mod(regmodrm);
867	rm  = f_rm(regmodrm);
868
869	if (mod == 3) {
870	    addrp->is_reg = TRUE;
871	    addrp->disp = rm;
872	    return (loc);
873	}
874	addrp->is_reg = FALSE;
875	addrp->index = 0;
876
877	if (short_addr) {
878	    addrp->index = 0;
879	    addrp->ss = 0;
880	    switch (mod) {
881		case 0:
882		    if (rm == 6) {
883			get_value_inc(disp, loc, 2, TRUE);
884			addrp->disp = disp;
885			addrp->base = 0;
886		    }
887		    else {
888			addrp->disp = 0;
889			addrp->base = db_index_reg_16[rm];
890		    }
891		    break;
892		case 1:
893		    get_value_inc(disp, loc, 1, TRUE);
894		    addrp->disp = disp;
895		    addrp->base = db_index_reg_16[rm];
896		    break;
897		case 2:
898		    get_value_inc(disp, loc, 2, TRUE);
899		    addrp->disp = disp;
900		    addrp->base = db_index_reg_16[rm];
901		    break;
902	    }
903	}
904	else {
905	    if (mod != 3 && rm == 4) {
906		get_value_inc(sib, loc, 1, FALSE);
907		rm = sib_base(sib);
908		index = sib_index(sib);
909		if (index != 4)
910		    addrp->index = db_reg[LONG][index];
911		addrp->ss = sib_ss(sib);
912	    }
913
914	    switch (mod) {
915		case 0:
916		    if (rm == 5) {
917			get_value_inc(addrp->disp, loc, 4, FALSE);
918			addrp->base = 0;
919		    }
920		    else {
921			addrp->disp = 0;
922			addrp->base = db_reg[LONG][rm];
923		    }
924		    break;
925
926		case 1:
927		    get_value_inc(disp, loc, 1, TRUE);
928		    addrp->disp = disp;
929		    addrp->base = db_reg[LONG][rm];
930		    break;
931
932		case 2:
933		    get_value_inc(disp, loc, 4, FALSE);
934		    addrp->disp = disp;
935		    addrp->base = db_reg[LONG][rm];
936		    break;
937	    }
938	}
939	return (loc);
940}
941
942void
943db_print_address(seg, size, addrp)
944	char *		seg;
945	int		size;
946	struct i_addr	*addrp;
947{
948	if (addrp->is_reg) {
949	    db_printf("%s", db_reg[size][addrp->disp]);
950	    return;
951	}
952
953	if (seg) {
954	    db_printf("%s:", seg);
955	}
956
957	db_printsym((db_addr_t)addrp->disp, DB_STGY_ANY);
958	if (addrp->base != 0 || addrp->index != 0) {
959	    db_printf("(");
960	    if (addrp->base)
961		db_printf("%s", addrp->base);
962	    if (addrp->index)
963		db_printf(",%s,%d", addrp->index, 1<<addrp->ss);
964	    db_printf(")");
965	}
966}
967
968/*
969 * Disassemble floating-point ("escape") instruction
970 * and return updated location.
971 */
972db_addr_t
973db_disasm_esc(loc, inst, short_addr, size, seg)
974	db_addr_t	loc;
975	int		inst;
976	int		short_addr;
977	int		size;
978	char *		seg;
979{
980	int		regmodrm;
981	struct finst	*fp;
982	int		mod;
983	struct i_addr	address;
984	char *		name;
985
986	get_value_inc(regmodrm, loc, 1, FALSE);
987	fp = &db_Esc_inst[inst - 0xd8][f_reg(regmodrm)];
988	mod = f_mod(regmodrm);
989	if (mod != 3) {
990	    /*
991	     * Normal address modes.
992	     */
993	    loc = db_read_address(loc, short_addr, regmodrm, &address);
994	    db_printf(fp->f_name);
995	    switch(fp->f_size) {
996		case SNGL:
997		    db_printf("s");
998		    break;
999		case DBLR:
1000		    db_printf("l");
1001		    break;
1002		case EXTR:
1003		    db_printf("t");
1004		    break;
1005		case WORD:
1006		    db_printf("s");
1007		    break;
1008		case LONG:
1009		    db_printf("l");
1010		    break;
1011		case QUAD:
1012		    db_printf("q");
1013		    break;
1014		default:
1015		    break;
1016	    }
1017	    db_printf("\t");
1018	    db_print_address(seg, BYTE, &address);
1019	}
1020	else {
1021	    /*
1022	     * 'reg-reg' - special formats
1023	     */
1024	    switch (fp->f_rrmode) {
1025		case op2(ST,STI):
1026		    name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1027		    db_printf("%s\t%%st,%%st(%d)",name,f_rm(regmodrm));
1028		    break;
1029		case op2(STI,ST):
1030		    name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1031		    db_printf("%s\t%%st(%d),%%st",name, f_rm(regmodrm));
1032		    break;
1033		case op1(STI):
1034		    name = (fp->f_rrname) ? fp->f_rrname : fp->f_name;
1035		    db_printf("%s\t%%st(%d)",name, f_rm(regmodrm));
1036		    break;
1037		case op1(X):
1038		    db_printf("%s", ((char **)fp->f_rrname)[f_rm(regmodrm)]);
1039		    break;
1040		case op1(XA):
1041		    db_printf("%s\t%%ax",
1042				 ((char **)fp->f_rrname)[f_rm(regmodrm)]);
1043		    break;
1044		default:
1045		    db_printf("<bad instruction>");
1046		    break;
1047	    }
1048	}
1049
1050	return (loc);
1051}
1052
1053/*
1054 * Disassemble instruction at 'loc'.  'altfmt' specifies an
1055 * (optional) alternate format.  Return address of start of
1056 * next instruction.
1057 */
1058db_addr_t
1059db_disasm(loc, altfmt)
1060	db_addr_t	loc;
1061	boolean_t	altfmt;
1062{
1063	int	inst;
1064	int	size;
1065	int	short_addr;
1066	char *	seg;
1067	struct inst *	ip;
1068	char *	i_name;
1069	int	i_size;
1070	int	i_mode;
1071	int	regmodrm = 0;
1072	boolean_t	first;
1073	int	displ;
1074	int	prefix;
1075	int	imm;
1076	int	imm2;
1077	int	len;
1078	struct i_addr	address;
1079
1080	get_value_inc(inst, loc, 1, FALSE);
1081	short_addr = FALSE;
1082	size = LONG;
1083	seg = 0;
1084
1085	/*
1086	 * Get prefixes
1087	 */
1088	prefix = TRUE;
1089	do {
1090	    switch (inst) {
1091		case 0x66:		/* data16 */
1092		    size = WORD;
1093		    break;
1094		case 0x67:
1095		    short_addr = TRUE;
1096		    break;
1097		case 0x26:
1098		    seg = "%es";
1099		    break;
1100		case 0x36:
1101		    seg = "%ss";
1102		    break;
1103		case 0x2e:
1104		    seg = "%cs";
1105		    break;
1106		case 0x3e:
1107		    seg = "%ds";
1108		    break;
1109		case 0x64:
1110		    seg = "%fs";
1111		    break;
1112		case 0x65:
1113		    seg = "%gs";
1114		    break;
1115		case 0xf0:
1116		    db_printf("lock ");
1117		    break;
1118		case 0xf2:
1119		    db_printf("repne ");
1120		    break;
1121		case 0xf3:
1122		    db_printf("repe ");	/* XXX repe VS rep */
1123		    break;
1124		default:
1125		    prefix = FALSE;
1126		    break;
1127	    }
1128	    if (prefix) {
1129		get_value_inc(inst, loc, 1, FALSE);
1130	    }
1131	} while (prefix);
1132
1133	if (inst >= 0xd8 && inst <= 0xdf) {
1134	    loc = db_disasm_esc(loc, inst, short_addr, size, seg);
1135	    db_printf("\n");
1136	    return (loc);
1137	}
1138
1139	if (inst == 0x0f) {
1140	    get_value_inc(inst, loc, 1, FALSE);
1141	    ip = db_inst_0f[inst>>4];
1142	    if (ip == 0) {
1143		ip = &db_bad_inst;
1144	    }
1145	    else {
1146		ip = &ip[inst&0xf];
1147	    }
1148	}
1149	else
1150	    ip = &db_inst_table[inst];
1151
1152	if (ip->i_has_modrm) {
1153	    get_value_inc(regmodrm, loc, 1, FALSE);
1154	    loc = db_read_address(loc, short_addr, regmodrm, &address);
1155	}
1156
1157	i_name = ip->i_name;
1158	i_size = ip->i_size;
1159	i_mode = ip->i_mode;
1160
1161	if (ip->i_extra == (char *)db_Grp1 ||
1162	    ip->i_extra == (char *)db_Grp2 ||
1163	    ip->i_extra == (char *)db_Grp6 ||
1164	    ip->i_extra == (char *)db_Grp7 ||
1165	    ip->i_extra == (char *)db_Grp8) {
1166	    i_name = ((char **)ip->i_extra)[f_reg(regmodrm)];
1167	}
1168	else if (ip->i_extra == (char *)db_Grp3) {
1169	    ip = (struct inst *)ip->i_extra;
1170	    ip = &ip[f_reg(regmodrm)];
1171	    i_name = ip->i_name;
1172	    i_mode = ip->i_mode;
1173	}
1174	else if (ip->i_extra == (char *)db_Grp4 ||
1175		 ip->i_extra == (char *)db_Grp5) {
1176	    ip = (struct inst *)ip->i_extra;
1177	    ip = &ip[f_reg(regmodrm)];
1178	    i_name = ip->i_name;
1179	    i_mode = ip->i_mode;
1180	    i_size = ip->i_size;
1181	}
1182
1183	if (i_size == SDEP) {
1184	    if (size == WORD)
1185		db_printf(i_name);
1186	    else
1187		db_printf(ip->i_extra);
1188	}
1189	else {
1190	    db_printf(i_name);
1191	    if (i_size != NONE) {
1192		if (i_size == BYTE) {
1193		    db_printf("b");
1194		    size = BYTE;
1195		}
1196		else if (i_size == WORD) {
1197		    db_printf("w");
1198		    size = WORD;
1199		}
1200		else if (size == WORD)
1201		    db_printf("w");
1202		else
1203		    db_printf("l");
1204	    }
1205	}
1206	db_printf("\t");
1207	for (first = TRUE;
1208	     i_mode != 0;
1209	     i_mode >>= 8, first = FALSE)
1210	{
1211	    if (!first)
1212		db_printf(",");
1213
1214	    switch (i_mode & 0xFF) {
1215
1216		case E:
1217		    db_print_address(seg, size, &address);
1218		    break;
1219
1220		case Eind:
1221		    db_printf("*");
1222		    db_print_address(seg, size, &address);
1223		    break;
1224
1225		case Ew:
1226		    db_print_address(seg, WORD, &address);
1227		    break;
1228
1229		case Eb:
1230		    db_print_address(seg, BYTE, &address);
1231		    break;
1232
1233		case R:
1234		    db_printf("%s", db_reg[size][f_reg(regmodrm)]);
1235		    break;
1236
1237		case Rw:
1238		    db_printf("%s", db_reg[WORD][f_reg(regmodrm)]);
1239		    break;
1240
1241		case Ri:
1242		    db_printf("%s", db_reg[size][f_rm(inst)]);
1243		    break;
1244
1245		case S:
1246		    db_printf("%s", db_seg_reg[f_reg(regmodrm)]);
1247		    break;
1248
1249		case Si:
1250		    db_printf("%s", db_seg_reg[f_reg(inst)]);
1251		    break;
1252
1253		case A:
1254		    db_printf("%s", db_reg[size][0]);	/* acc */
1255		    break;
1256
1257		case BX:
1258		    if (seg)
1259			db_printf("%s:", seg);
1260		    db_printf("(%s)", short_addr ? "%bx" : "%ebx");
1261		    break;
1262
1263		case CL:
1264		    db_printf("%%cl");
1265		    break;
1266
1267		case DX:
1268		    db_printf("%%dx");
1269		    break;
1270
1271		case SI:
1272		    if (seg)
1273			db_printf("%s:", seg);
1274		    db_printf("(%s)", short_addr ? "%si" : "%esi");
1275		    break;
1276
1277		case DI:
1278		    db_printf("%%es:(%s)", short_addr ? "%di" : "%edi");
1279		    break;
1280
1281		case CR:
1282		    db_printf("%%cr%d", f_reg(regmodrm));
1283		    break;
1284
1285		case DR:
1286		    db_printf("%%dr%d", f_reg(regmodrm));
1287		    break;
1288
1289		case TR:
1290		    db_printf("%%tr%d", f_reg(regmodrm));
1291		    break;
1292
1293		case I:
1294		    len = db_lengths[size];
1295		    get_value_inc(imm, loc, len, FALSE);/* unsigned */
1296		    db_printf("$%#n", imm);
1297		    break;
1298
1299		case Is:
1300		    len = db_lengths[size];
1301		    get_value_inc(imm, loc, len, TRUE);	/* signed */
1302		    db_printf("$%#r", imm);
1303		    break;
1304
1305		case Ib:
1306		    get_value_inc(imm, loc, 1, FALSE);	/* unsigned */
1307		    db_printf("$%#n", imm);
1308		    break;
1309
1310		case Ibs:
1311		    get_value_inc(imm, loc, 1, TRUE);	/* signed */
1312		    db_printf("$%#r", imm);
1313		    break;
1314
1315		case Iw:
1316		    get_value_inc(imm, loc, 2, FALSE);	/* unsigned */
1317		    db_printf("$%#n", imm);
1318		    break;
1319
1320		case Il:
1321		    get_value_inc(imm, loc, 4, FALSE);
1322		    db_printf("$%#n", imm);
1323		    break;
1324
1325		case O:
1326		    if (short_addr) {
1327			get_value_inc(displ, loc, 2, TRUE);
1328		    }
1329		    else {
1330			get_value_inc(displ, loc, 4, TRUE);
1331		    }
1332		    if (seg)
1333			db_printf("%s:%#r",seg, displ);
1334		    else
1335			db_printsym((db_addr_t)displ, DB_STGY_ANY);
1336		    break;
1337
1338		case Db:
1339		    get_value_inc(displ, loc, 1, TRUE);
1340		    db_printsym((db_addr_t)(displ + loc), DB_STGY_XTRN);
1341		    break;
1342
1343		case Dl:
1344		    get_value_inc(displ, loc, 4, TRUE);
1345		    db_printsym((db_addr_t)(displ + loc), DB_STGY_XTRN);
1346		    break;
1347
1348		case o1:
1349		    db_printf("$1");
1350		    break;
1351
1352		case o3:
1353		    db_printf("$3");
1354		    break;
1355
1356		case OS:
1357		    get_value_inc(imm, loc, 4, FALSE);	/* offset */
1358		    get_value_inc(imm2, loc, 2, FALSE);	/* segment */
1359		    db_printf("$%#n,%#n", imm2, imm);
1360		    break;
1361	    }
1362	}
1363
1364	if (altfmt == 0) {
1365	    if (inst == 0xe9 || inst == 0xeb) {
1366		/*
1367		 * GAS pads to longword boundary after unconditional jumps.
1368		 */
1369		loc = (loc + (4-1)) & ~(4-1);
1370	    }
1371	}
1372	db_printf("\n");
1373	return (loc);
1374}
1375
1376