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H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001/* disasm.c where all the _work_ gets done in the Netwide Disassembler
2 *
3 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
4 * Julian Hall. All rights reserved. The software is
5 * redistributable under the licence given in the file "Licence"
6 * distributed in the NASM archive.
7 *
8 * initial version 27/iii/95 by Simon Tatham
9 */
10
11#include <stdio.h>
12#include <string.h>
Keith Kaniosb7a89542007-04-12 02:40:54 +000013#include <inttypes.h>
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000014
15#include "nasm.h"
16#include "disasm.h"
17#include "sync.h"
18#include "insns.h"
19
20#include "names.c"
21
22extern struct itemplate **itable[];
23
24/*
25 * Flags that go into the `segment' field of `insn' structures
26 * during disassembly.
27 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +000028#define SEG_RELATIVE 1
29#define SEG_32BIT 2
30#define SEG_RMREG 4
31#define SEG_DISP8 8
32#define SEG_DISP16 16
33#define SEG_DISP32 32
34#define SEG_NODISP 64
35#define SEG_SIGNED 128
36#define SEG_64BIT 256
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000037
H. Peter Anvin0ee01422007-04-16 01:18:30 +000038/*
39 * REX flags
40 */
41#define REX_P 0x40 /* REX prefix present */
42#define REX_W 0x08 /* 64-bit operand size */
43#define REX_R 0x04 /* ModRM reg extension */
44#define REX_X 0x02 /* SIB index extension */
45#define REX_B 0x01 /* ModRM r/m extension */
46
H. Peter Anvin232badb2002-06-06 02:41:20 +000047#include "regdis.c"
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000048
H. Peter Anvin0ee01422007-04-16 01:18:30 +000049#define getu8(x) (*(uint8_t *)(x))
50#if defined(__i386__) || defined(__x86_64__)
51/* Littleendian CPU which can handle unaligned references */
52#define getu16(x) (*(uint16_t *)(x))
53#define getu32(x) (*(uint32_t *)(x))
54#define getu64(x) (*(uint64_t *)(x))
55#else
56static uint16_t getu16(uint8_t *data)
57{
58 return (uint16_t)data[0] + ((uint16_t)data[1] << 8);
59}
60static uint32_t getu32(uint8_t *data)
61{
62 return (uint32_t)getu16(data) + ((uint32_t)getu16(data+2) << 16);
63}
64static uint64_t getu64(uint8_t *data)
65{
66 return (uint64_t)getu32(data) + ((uint64_t)getu32(data+4) << 32);
67}
68#endif
69
70#define gets8(x) ((int8_t)getu8(x))
71#define gets16(x) ((int16_t)getu16(x))
72#define gets32(x) ((int32_t)getu32(x))
73#define gets64(x) ((int64_t)getu64(x))
74
75/* Important: regval must already have been adjusted for rex extensions */
76static int whichreg(int32_t regflags, int regval, int rex)
77{
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000078 if (!(REG_AL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000079 return R_AL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000080 if (!(REG_AX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000081 return R_AX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000082 if (!(REG_EAX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000083 return R_EAX;
H. Peter Anvin10101f22003-02-24 23:22:45 +000084 if (!(REG_DL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000085 return R_DL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000086 if (!(REG_DX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000087 return R_DX;
H. Peter Anvin10101f22003-02-24 23:22:45 +000088 if (!(REG_EDX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000089 return R_EDX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000090 if (!(REG_CL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000091 return R_CL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000092 if (!(REG_CX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000093 return R_CX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000094 if (!(REG_ECX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000095 return R_ECX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000096 if (!(FPU0 & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000097 return R_ST0;
H. Peter Anvind7ed89e2002-04-30 20:52:08 +000098 if (!(REG_CS & ~regflags))
H. Peter Anvin232badb2002-06-06 02:41:20 +000099 return (regval == 1) ? R_CS : 0;
H. Peter Anvin76690a12002-04-30 20:52:49 +0000100 if (!(REG_DESS & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000101 return (regval == 0 || regval == 2
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000102 || regval == 3 ? rd_sreg[regval] : 0);
H. Peter Anvin76690a12002-04-30 20:52:49 +0000103 if (!(REG_FSGS & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000104 return (regval == 4 || regval == 5 ? rd_sreg[regval] : 0);
H. Peter Anvin232badb2002-06-06 02:41:20 +0000105 if (!(REG_SEG67 & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000106 return (regval == 6 || regval == 7 ? rd_sreg[regval] : 0);
H. Peter Anvin232badb2002-06-06 02:41:20 +0000107
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000108 /* All the entries below look up regval in an 16-entry array */
109 if (regval < 0 || regval > 15)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000110 return 0;
H. Peter Anvin232badb2002-06-06 02:41:20 +0000111
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000112 if (!(rex & REX_P) && regval > 7)
113 return 0; /* Internal error! */
114
115 if (!((REGMEM | BITS8) & ~regflags)) {
116 if (rex & REX_P)
117 return rd_reg8_rex[regval];
118 else
119 return rd_reg8[regval];
120 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000121 if (!((REGMEM | BITS16) & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000122 return rd_reg16[regval];
H. Peter Anvine2c80182005-01-15 22:15:51 +0000123 if (!((REGMEM | BITS32) & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000124 return rd_reg32[regval];
H. Peter Anvinb061d592007-04-16 02:02:06 +0000125 if (!((REGMEM | BITS64) & ~regflags))
126 return rd_reg64[regval];
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000127 if (!(REG_SREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000128 return rd_sreg[regval & 7]; /* Ignore REX */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000129 if (!(REG_CREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000130 return rd_creg[regval];
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000131 if (!(REG_DREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000132 return rd_dreg[regval];
133 if (!(REG_TREG & ~regflags)) {
134 if (rex & REX_P)
135 return 0; /* TR registers are ill-defined with rex */
136 return rd_treg[regval];
137 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000138 if (!(FPUREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000139 return rd_fpureg[regval & 7]; /* Ignore REX */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000140 if (!(MMXREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000141 return rd_mmxreg[regval & 7]; /* Ignore REX */
H. Peter Anvin4836e332002-04-30 20:56:43 +0000142 if (!(XMMREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000143 return rd_xmmreg[regval];
H. Peter Anvin232badb2002-06-06 02:41:20 +0000144
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000145 return 0;
146}
147
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000148static const char *whichcond(int condval)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000149{
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000150 static int conds[] = {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000151 C_O, C_NO, C_C, C_NC, C_Z, C_NZ, C_NA, C_A,
152 C_S, C_NS, C_PE, C_PO, C_L, C_NL, C_NG, C_G
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000153 };
154 return conditions[conds[condval]];
155}
156
157/*
158 * Process an effective address (ModRM) specification.
159 */
Keith Kaniosb7a89542007-04-12 02:40:54 +0000160static uint8_t *do_ea(uint8_t *data, int modrm, int asize,
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000161 int segsize, operand * op, int rex)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000162{
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000163 int mod, rm, scale, index, base;
164
165 mod = (modrm >> 6) & 03;
166 rm = modrm & 07;
167
H. Peter Anvine2c80182005-01-15 22:15:51 +0000168 if (mod == 3) { /* pure register version */
169 op->basereg = rm;
170 op->segment |= SEG_RMREG;
171 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000172 }
173
174 op->addr_size = 0;
175
176 if (asize == 16) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000177 /*
178 * <mod> specifies the displacement size (none, byte or
179 * word), and <rm> specifies the register combination.
180 * Exception: mod=0,rm=6 does not specify [BP] as one might
181 * expect, but instead specifies [disp16].
182 */
183 op->indexreg = op->basereg = -1;
184 op->scale = 1; /* always, in 16 bits */
185 switch (rm) {
186 case 0:
187 op->basereg = R_BX;
188 op->indexreg = R_SI;
189 break;
190 case 1:
191 op->basereg = R_BX;
192 op->indexreg = R_DI;
193 break;
194 case 2:
195 op->basereg = R_BP;
196 op->indexreg = R_SI;
197 break;
198 case 3:
199 op->basereg = R_BP;
200 op->indexreg = R_DI;
201 break;
202 case 4:
203 op->basereg = R_SI;
204 break;
205 case 5:
206 op->basereg = R_DI;
207 break;
208 case 6:
209 op->basereg = R_BP;
210 break;
211 case 7:
212 op->basereg = R_BX;
213 break;
214 }
215 if (rm == 6 && mod == 0) { /* special case */
216 op->basereg = -1;
217 if (segsize != 16)
218 op->addr_size = 16;
219 mod = 2; /* fake disp16 */
220 }
221 switch (mod) {
222 case 0:
223 op->segment |= SEG_NODISP;
224 break;
225 case 1:
226 op->segment |= SEG_DISP8;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000227 op->offset = (int8_t)*data++;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000228 break;
229 case 2:
230 op->segment |= SEG_DISP16;
231 op->offset = *data++;
232 op->offset |= ((unsigned)*data++) << 8;
233 break;
234 }
235 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000236 } else {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000237 /*
238 * Once again, <mod> specifies displacement size (this time
239 * none, byte or *dword*), while <rm> specifies the base
240 * register. Again, [EBP] is missing, replaced by a pure
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000241 * disp32 (this time that's mod=0,rm=*5*) in 32-bit mode,
242 * and RIP-relative addressing in 64-bit mode.
243 *
244 * However, rm=4
H. Peter Anvine2c80182005-01-15 22:15:51 +0000245 * indicates not a single base register, but instead the
246 * presence of a SIB byte...
247 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000248 int a64 = asize == 64;
249
H. Peter Anvine2c80182005-01-15 22:15:51 +0000250 op->indexreg = -1;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000251
252 if (a64)
253 op->basereg = rd_reg64[rm | ((rex & REX_B) ? 8 : 0)];
254 else
255 op->basereg = rd_reg32[rm | ((rex & REX_B) ? 8 : 0)];
256
H. Peter Anvine2c80182005-01-15 22:15:51 +0000257 if (rm == 5 && mod == 0) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000258 if (segsize == 64) {
259 op->basereg = R_RIP;
260 op->segment |= SEG_RELATIVE;
261 mod = 2; /* fake disp32 */
262 } else {
263 op->basereg = -1;
264 if (segsize != 32)
265 op->addr_size = 32;
266 mod = 2; /* fake disp32 */
267 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000268 }
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000269
H. Peter Anvine2c80182005-01-15 22:15:51 +0000270 if (rm == 4) { /* process SIB */
271 scale = (*data >> 6) & 03;
272 index = (*data >> 3) & 07;
273 base = *data & 07;
274 data++;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000275
H. Peter Anvine2c80182005-01-15 22:15:51 +0000276 op->scale = 1 << scale;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000277
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000278 if (index == 4)
279 op->indexreg = -1; /* ESP/RSP/R12 cannot be an index */
280 else if (a64)
281 op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
282 else
283 op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
284
285 if (base == 5 && mod == 0) {
286 op->basereg = -1;
287 mod = 2; /* Fake disp32 */
288 } else if (a64)
289 op->basereg = rd_reg64[base | ((rex & REX_B) ? 8 : 0)];
290 else
291 op->basereg = rd_reg32[base | ((rex & REX_B) ? 8 : 0)];
H. Peter Anvine2c80182005-01-15 22:15:51 +0000292 }
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000293
H. Peter Anvine2c80182005-01-15 22:15:51 +0000294 switch (mod) {
295 case 0:
296 op->segment |= SEG_NODISP;
297 break;
298 case 1:
299 op->segment |= SEG_DISP8;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000300 op->offset = gets8(data);
301 data++;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000302 break;
303 case 2:
304 op->segment |= SEG_DISP32;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000305 op->offset = getu32(data);
306 data += 4;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000307 break;
308 }
309 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000310 }
311}
312
313/*
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000314 * Determine whether the instruction template in t corresponds to the data
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000315 * stream in data. Return the number of bytes matched if so.
316 */
Keith Kaniosb7a89542007-04-12 02:40:54 +0000317static int matches(struct itemplate *t, uint8_t *data, int asize,
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000318 int osize, int segsize, int rep, insn * ins,
319 int rex, int *rexout)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000320{
Keith Kaniosb7a89542007-04-12 02:40:54 +0000321 uint8_t *r = (uint8_t *)(t->code);
322 uint8_t *origdata = data;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000323 int a_used = FALSE, o_used = FALSE;
324 int drep = 0;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000325
326 *rexout = rex;
327
328 if (segsize == 64) {
329 if (t->flags & IF_NOLONG)
330 return FALSE;
331 } else {
332 if (t->flags & IF_X64)
333 return FALSE;
334 }
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000335
H. Peter Anvine2c80182005-01-15 22:15:51 +0000336 if (rep == 0xF2)
337 drep = P_REPNE;
338 else if (rep == 0xF3)
339 drep = P_REP;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000340
H. Peter Anvine2c80182005-01-15 22:15:51 +0000341 while (*r) {
342 int c = *r++;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000343
344 /* FIX: change this into a switch */
345 if (c >= 01 && c <= 03) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000346 while (c--)
347 if (*r++ != *data++)
348 return FALSE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000349 } else if (c == 04) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000350 switch (*data++) {
351 case 0x07:
352 ins->oprs[0].basereg = 0;
353 break;
354 case 0x17:
355 ins->oprs[0].basereg = 2;
356 break;
357 case 0x1F:
358 ins->oprs[0].basereg = 3;
359 break;
360 default:
361 return FALSE;
362 }
H. Peter Anvinb061d592007-04-16 02:02:06 +0000363 } else if (c == 05) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000364 switch (*data++) {
365 case 0xA1:
366 ins->oprs[0].basereg = 4;
367 break;
368 case 0xA9:
369 ins->oprs[0].basereg = 5;
370 break;
371 default:
372 return FALSE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000373 }
374 } else if (c == 06) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000375 switch (*data++) {
376 case 0x06:
377 ins->oprs[0].basereg = 0;
378 break;
379 case 0x0E:
380 ins->oprs[0].basereg = 1;
381 break;
382 case 0x16:
383 ins->oprs[0].basereg = 2;
384 break;
385 case 0x1E:
386 ins->oprs[0].basereg = 3;
387 break;
388 default:
389 return FALSE;
390 }
H. Peter Anvinb061d592007-04-16 02:02:06 +0000391 } else if (c == 07) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000392 switch (*data++) {
393 case 0xA0:
394 ins->oprs[0].basereg = 4;
395 break;
396 case 0xA8:
397 ins->oprs[0].basereg = 5;
398 break;
399 default:
400 return FALSE;
401 }
H. Peter Anvinb061d592007-04-16 02:02:06 +0000402 } else if (c >= 010 && c <= 012) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000403 int t = *r++, d = *data++;
404 if (d < t || d > t + 7)
405 return FALSE;
406 else {
H. Peter Anvinb061d592007-04-16 02:02:06 +0000407 ins->oprs[c - 010].basereg = (d-t)+(rex & REX_B ? 8 : 0);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000408 ins->oprs[c - 010].segment |= SEG_RMREG;
409 }
H. Peter Anvinb061d592007-04-16 02:02:06 +0000410 } else if (c == 017) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000411 if (*data++)
412 return FALSE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000413 } else if (c >= 014 && c <= 016) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000414 ins->oprs[c - 014].offset = (int8_t)*data++;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000415 ins->oprs[c - 014].segment |= SEG_SIGNED;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000416 } else if (c >= 020 && c <= 022) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000417 ins->oprs[c - 020].offset = *data++;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000418 } else if (c >= 024 && c <= 026) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000419 ins->oprs[c - 024].offset = *data++;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000420 } else if (c >= 030 && c <= 032) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000421 ins->oprs[c - 030].offset = getu16(data);
422 data += 2;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000423 } else if (c >= 034 && c <= 036) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000424 if (osize == 32) {
425 ins->oprs[c - 034].offset = getu32(data);
426 data += 4;
427 } else {
428 ins->oprs[c - 034].offset = getu16(data);
429 data += 2;
430 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000431 if (segsize != asize)
432 ins->oprs[c - 034].addr_size = asize;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000433 } else if (c >= 040 && c <= 042) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000434 ins->oprs[c - 040].offset = getu32(data);
435 data += 4;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000436 } else if (c >= 044 && c <= 046) {
437 switch (asize) {
438 case 16:
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000439 ins->oprs[c - 044].offset = getu16(data);
440 data += 2;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000441 break;
442 case 32:
443 ins->oprs[c - 044].offset = getu32(data);
444 data += 4;
445 break;
446 case 64:
447 ins->oprs[c - 044].offset = getu64(data);
448 data += 8;
449 break;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000450 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000451 if (segsize != asize)
452 ins->oprs[c - 044].addr_size = asize;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000453 } else if (c >= 050 && c <= 052) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000454 ins->oprs[c - 050].offset = gets8(data++);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000455 ins->oprs[c - 050].segment |= SEG_RELATIVE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000456 } else if (c >= 054 && c <= 056) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000457 ins->oprs[c - 054].offset = getu64(data);
458 data += 8;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000459 } else if (c >= 060 && c <= 062) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000460 ins->oprs[c - 060].offset = gets16(data);
461 data += 2;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000462 ins->oprs[c - 060].segment |= SEG_RELATIVE;
463 ins->oprs[c - 060].segment &= ~SEG_32BIT;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000464 } else if (c >= 064 && c <= 066) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000465 if (osize == 32) {
466 ins->oprs[c - 064].offset = getu32(data);
467 data += 4;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000468 ins->oprs[c - 064].segment |= SEG_32BIT;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000469 } else {
470 ins->oprs[c - 064].offset = getu16(data);
471 data += 2;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000472 ins->oprs[c - 064].segment &= ~SEG_32BIT;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000473 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000474 if (segsize != osize) {
475 ins->oprs[c - 064].type =
476 (ins->oprs[c - 064].type & NON_SIZE)
477 | ((osize == 16) ? BITS16 : BITS32);
478 }
H. Peter Anvinb061d592007-04-16 02:02:06 +0000479 } else if (c >= 070 && c <= 072) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000480 ins->oprs[c - 070].offset = getu32(data);
481 data += 4;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000482 ins->oprs[c - 070].segment |= SEG_32BIT | SEG_RELATIVE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000483 } else if (c >= 0100 && c < 0130) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000484 int modrm = *data++;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000485 ins->oprs[c & 07].basereg = ((modrm >> 3)&7)+(rex & REX_R ? 8 : 0);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000486 ins->oprs[c & 07].segment |= SEG_RMREG;
487 data = do_ea(data, modrm, asize, segsize,
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000488 &ins->oprs[(c >> 3) & 07], rex);
H. Peter Anvinb061d592007-04-16 02:02:06 +0000489 } else if (c >= 0130 && c <= 0132) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000490 ins->oprs[c - 0130].offset = getu16(data);
491 data += 2;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000492 } else if (c >= 0140 && c <= 0142) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000493 ins->oprs[c - 0140].offset = getu32(data);
494 data += 4;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000495 } else if (c >= 0200 && c <= 0277) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000496 int modrm = *data++;
497 if (((modrm >> 3) & 07) != (c & 07))
498 return FALSE; /* spare field doesn't match up */
499 data = do_ea(data, modrm, asize, segsize,
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000500 &ins->oprs[(c >> 3) & 07], rex);
H. Peter Anvinb061d592007-04-16 02:02:06 +0000501 } else if (c >= 0300 && c <= 0302) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000502 if (asize)
503 ins->oprs[c - 0300].segment |= SEG_32BIT;
504 else
505 ins->oprs[c - 0300].segment &= ~SEG_32BIT;
506 a_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000507 } else if (c == 0310) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000508 if (asize != 16)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000509 return FALSE;
510 else
511 a_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000512 } else if (c == 0311) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000513 if (asize == 16)
514 return FALSE;
515 else
516 a_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000517 } else if (c == 0312) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000518 if (asize != segsize)
519 return FALSE;
520 else
521 a_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000522 } else if (c == 0320) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000523 if (osize != 16)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000524 return FALSE;
525 else
526 o_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000527 } else if (c == 0321) {
528 if (osize != 32)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000529 return FALSE;
530 else
531 o_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000532 } else if (c == 0322) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000533 if (osize != (segsize == 16) ? 16 : 32)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000534 return FALSE;
535 else
536 o_used = TRUE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000537 } else if (c == 0323) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000538 rex |= REX_W; /* 64-bit only instruction */
539 osize = 64;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000540 } else if (c == 0324) {
541 if (!(rex & REX_P) || osize != 64)
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000542 return FALSE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000543 } else if (c == 0330) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000544 int t = *r++, d = *data++;
545 if (d < t || d > t + 15)
546 return FALSE;
547 else
548 ins->condition = d - t;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000549 } else if (c == 0331) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000550 if (rep)
551 return FALSE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000552 } else if (c == 0332) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000553 if (drep == P_REP)
554 drep = P_REPE;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000555 } else if (c == 0333) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000556 if (rep != 0xF3)
557 return FALSE;
558 drep = 0;
559 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000560 }
561
562 /*
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000563 * Check for unused rep or a/o prefixes.
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000564 */
565 ins->nprefix = 0;
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000566 if (drep)
567 ins->prefixes[ins->nprefix++] = drep;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000568 if (!a_used && asize != segsize)
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000569 ins->prefixes[ins->nprefix++] = asize == 16 ? P_A16 : P_A32;
570 if (!o_used && osize == ((segsize == 16) ? 32 : 16)) {
571 fprintf(stderr, "osize = %d, segsize = %d\n", osize, segsize);
572 ins->prefixes[ins->nprefix++] = osize == 16 ? P_O16 : P_O32;
573 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000574
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000575 /* Fix: check for redundant REX prefixes */
576
577 *rexout = rex;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000578 return data - origdata;
579}
580
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000581int32_t disasm(uint8_t *data, char *output, int outbufsize, int segsize,
Keith Kaniosb7a89542007-04-12 02:40:54 +0000582 int32_t offset, int autosync, uint32_t prefer)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000583{
H. Peter Anvin4836e332002-04-30 20:56:43 +0000584 struct itemplate **p, **best_p;
585 int length, best_length = 0;
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000586 char *segover;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000587 int rep, lock, asize, osize, i, slen, colon, rex, rexout, best_rex;
Keith Kaniosb7a89542007-04-12 02:40:54 +0000588 uint8_t *origdata;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000589 int works;
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000590 insn tmp_ins, ins;
Keith Kaniosb7a89542007-04-12 02:40:54 +0000591 uint32_t goodness, best;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000592
593 /*
594 * Scan for prefixes.
595 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000596 asize = segsize;
597 osize = (segsize == 64) ? 32 : segsize;
598 rex = 0;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000599 segover = NULL;
600 rep = lock = 0;
601 origdata = data;
602 for (;;) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000603 if (*data == 0xF3 || *data == 0xF2)
604 rep = *data++;
605 else if (*data == 0xF0)
606 lock = *data++;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000607 else if (*data == 0x2E)
608 segover = "cs", data++;
609 else if (*data == 0x36)
610 segover = "ss", data++;
611 else if (*data == 0x3E)
612 segover = "ds", data++;
613 else if (*data == 0x26)
614 segover = "es", data++;
615 else if (*data == 0x64)
616 segover = "fs", data++;
617 else if (*data == 0x65)
618 segover = "gs", data++;
619 else if (*data == 0x66) {
620 if (segsize != 64) /* 66 prefix is ignored in 64-bit mode */
621 osize = 48 - segsize;
622 data++;
623 } else if (*data == 0x67) {
624 asize = (segsize == 32) ? 16 : 32;
625 data++;
626 } else if (segsize == 64 && (*data & 0xf0) == REX_P) {
627 rex = *data++;
628 if (rex & REX_W)
629 osize = 64;
630 break; /* REX is always the last prefix */
631 } else {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000632 break;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000633 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000634 }
635
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000636 tmp_ins.oprs[0].segment = tmp_ins.oprs[1].segment =
H. Peter Anvine2c80182005-01-15 22:15:51 +0000637 tmp_ins.oprs[2].segment =
638 tmp_ins.oprs[0].addr_size = tmp_ins.oprs[1].addr_size =
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000639 tmp_ins.oprs[2].addr_size = (segsize == 64 ? SEG_64BIT :
640 segsize == 32 ? SEG_32BIT : 0);
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000641 tmp_ins.condition = -1;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000642 best = -1; /* Worst possible */
H. Peter Anvin4836e332002-04-30 20:56:43 +0000643 best_p = NULL;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000644 best_rex = 0;
H. Peter Anvin4836e332002-04-30 20:56:43 +0000645 for (p = itable[*data]; *p; p++) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000646 if ((length = matches(*p, data, asize, osize,
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000647 segsize, rep, &tmp_ins, rex, &rexout))) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000648 works = TRUE;
649 /*
650 * Final check to make sure the types of r/m match up.
651 */
652 for (i = 0; i < (*p)->operands; i++) {
653 if (
654 /* If it's a mem-only EA but we have a register, die. */
655 ((tmp_ins.oprs[i].segment & SEG_RMREG) &&
656 !(MEMORY & ~(*p)->opd[i])) ||
657 /* If it's a reg-only EA but we have a memory ref, die. */
658 (!(tmp_ins.oprs[i].segment & SEG_RMREG) &&
659 !(REGNORM & ~(*p)->opd[i]) &&
660 !((*p)->opd[i] & REG_SMASK)) ||
661 /* Register type mismatch (eg FS vs REG_DESS): die. */
662 ((((*p)->opd[i] & (REGISTER | FPUREG)) ||
663 (tmp_ins.oprs[i].segment & SEG_RMREG)) &&
664 !whichreg((*p)->opd[i],
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000665 tmp_ins.oprs[i].basereg, rexout))) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000666 works = FALSE;
667 break;
668 }
669 }
670
671 if (works) {
672 goodness = ((*p)->flags & IF_PFMASK) ^ prefer;
673 if (goodness < best) {
674 /* This is the best one found so far */
675 best = goodness;
676 best_p = p;
677 best_length = length;
678 ins = tmp_ins;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000679 best_rex = rexout;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000680 }
681 }
682 }
H. Peter Anvin4836e332002-04-30 20:56:43 +0000683 }
H. Peter Anvineba20a72002-04-30 20:53:55 +0000684
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000685 if (!best_p)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000686 return 0; /* no instruction was matched */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000687
H. Peter Anvin4836e332002-04-30 20:56:43 +0000688 /* Pick the best match */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000689 p = best_p;
H. Peter Anvin4836e332002-04-30 20:56:43 +0000690 length = best_length;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000691 rex = best_rex;
692 if (best_rex & REX_W)
693 osize = 64;
H. Peter Anvin4836e332002-04-30 20:56:43 +0000694
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000695 slen = 0;
696
Ed Beroset64ab5192004-12-15 23:32:57 +0000697 /* TODO: snprintf returns the value that the string would have if
H. Peter Anvine2c80182005-01-15 22:15:51 +0000698 * the buffer were long enough, and not the actual length of
699 * the returned string, so each instance of using the return
700 * value of snprintf should actually be checked to assure that
701 * the return value is "sane." Maybe a macro wrapper could
702 * be used for that purpose.
703 */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000704 if (lock)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000705 slen += snprintf(output + slen, outbufsize - slen, "lock ");
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000706 for (i = 0; i < ins.nprefix; i++)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000707 switch (ins.prefixes[i]) {
708 case P_REP:
709 slen += snprintf(output + slen, outbufsize - slen, "rep ");
710 break;
711 case P_REPE:
712 slen += snprintf(output + slen, outbufsize - slen, "repe ");
713 break;
714 case P_REPNE:
715 slen += snprintf(output + slen, outbufsize - slen, "repne ");
716 break;
717 case P_A16:
718 slen += snprintf(output + slen, outbufsize - slen, "a16 ");
719 break;
720 case P_A32:
721 slen += snprintf(output + slen, outbufsize - slen, "a32 ");
722 break;
723 case P_O16:
724 slen += snprintf(output + slen, outbufsize - slen, "o16 ");
725 break;
726 case P_O32:
727 slen += snprintf(output + slen, outbufsize - slen, "o32 ");
728 break;
729 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000730
731 for (i = 0; i < elements(ico); i++)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000732 if ((*p)->opcode == ico[i]) {
733 slen +=
734 snprintf(output + slen, outbufsize - slen, "%s%s", icn[i],
735 whichcond(ins.condition));
736 break;
737 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000738 if (i >= elements(ico))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000739 slen +=
740 snprintf(output + slen, outbufsize - slen, "%s",
741 insn_names[(*p)->opcode]);
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000742 colon = FALSE;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000743 length += data - origdata; /* fix up for prefixes */
744 for (i = 0; i < (*p)->operands; i++) {
745 output[slen++] = (colon ? ':' : i == 0 ? ' ' : ',');
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000746
H. Peter Anvine2c80182005-01-15 22:15:51 +0000747 if (ins.oprs[i].segment & SEG_RELATIVE) {
748 ins.oprs[i].offset += offset + length;
749 /*
750 * sort out wraparound
751 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000752 if (!(ins.oprs[i].segment & (SEG_32BIT|SEG_64BIT)))
753 ins.oprs[i].offset &= 0xffff;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000754 /*
755 * add sync marker, if autosync is on
756 */
757 if (autosync)
758 add_sync(ins.oprs[i].offset, 0L);
759 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000760
H. Peter Anvine2c80182005-01-15 22:15:51 +0000761 if ((*p)->opd[i] & COLON)
762 colon = TRUE;
763 else
764 colon = FALSE;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000765
H. Peter Anvine2c80182005-01-15 22:15:51 +0000766 if (((*p)->opd[i] & (REGISTER | FPUREG)) ||
767 (ins.oprs[i].segment & SEG_RMREG)) {
768 ins.oprs[i].basereg = whichreg((*p)->opd[i],
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000769 ins.oprs[i].basereg, rex);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000770 if ((*p)->opd[i] & TO)
771 slen += snprintf(output + slen, outbufsize - slen, "to ");
772 slen += snprintf(output + slen, outbufsize - slen, "%s",
773 reg_names[ins.oprs[i].basereg -
774 EXPR_REG_START]);
775 } else if (!(UNITY & ~(*p)->opd[i])) {
776 output[slen++] = '1';
777 } else if ((*p)->opd[i] & IMMEDIATE) {
778 if ((*p)->opd[i] & BITS8) {
779 slen +=
780 snprintf(output + slen, outbufsize - slen, "byte ");
781 if (ins.oprs[i].segment & SEG_SIGNED) {
782 if (ins.oprs[i].offset < 0) {
783 ins.oprs[i].offset *= -1;
784 output[slen++] = '-';
785 } else
786 output[slen++] = '+';
787 }
788 } else if ((*p)->opd[i] & BITS16) {
789 slen +=
790 snprintf(output + slen, outbufsize - slen, "word ");
791 } else if ((*p)->opd[i] & BITS32) {
792 slen +=
793 snprintf(output + slen, outbufsize - slen, "dword ");
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000794 } else if ((*p)->opd[i] & BITS64) {
795 slen +=
796 snprintf(output + slen, outbufsize - slen, "qword ");
H. Peter Anvine2c80182005-01-15 22:15:51 +0000797 } else if ((*p)->opd[i] & NEAR) {
798 slen +=
799 snprintf(output + slen, outbufsize - slen, "near ");
800 } else if ((*p)->opd[i] & SHORT) {
801 slen +=
802 snprintf(output + slen, outbufsize - slen, "short ");
803 }
804 slen +=
Keith Kanios93f2e9a2007-04-14 00:10:59 +0000805 snprintf(output + slen, outbufsize - slen, "0x%"PRIx64"",
H. Peter Anvine2c80182005-01-15 22:15:51 +0000806 ins.oprs[i].offset);
807 } else if (!(MEM_OFFS & ~(*p)->opd[i])) {
808 slen +=
Keith Kanios93f2e9a2007-04-14 00:10:59 +0000809 snprintf(output + slen, outbufsize - slen, "[%s%s%s0x%"PRIx64"]",
Keith Kaniosb7a89542007-04-12 02:40:54 +0000810 ((const char*)segover ? (const char*)segover : ""), /* placate type mistmatch warning */
811 ((const char*)segover ? ":" : ""), /* by using (const char*) instead of uint8_t* */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000812 (ins.oprs[i].addr_size ==
813 32 ? "dword " : ins.oprs[i].addr_size ==
814 16 ? "word " : ""), ins.oprs[i].offset);
815 segover = NULL;
816 } else if (!(REGMEM & ~(*p)->opd[i])) {
817 int started = FALSE;
818 if ((*p)->opd[i] & BITS8)
819 slen +=
820 snprintf(output + slen, outbufsize - slen, "byte ");
821 if ((*p)->opd[i] & BITS16)
822 slen +=
823 snprintf(output + slen, outbufsize - slen, "word ");
824 if ((*p)->opd[i] & BITS32)
825 slen +=
826 snprintf(output + slen, outbufsize - slen, "dword ");
827 if ((*p)->opd[i] & BITS64)
828 slen +=
829 snprintf(output + slen, outbufsize - slen, "qword ");
830 if ((*p)->opd[i] & BITS80)
831 slen +=
832 snprintf(output + slen, outbufsize - slen, "tword ");
833 if ((*p)->opd[i] & FAR)
834 slen += snprintf(output + slen, outbufsize - slen, "far ");
835 if ((*p)->opd[i] & NEAR)
836 slen +=
837 snprintf(output + slen, outbufsize - slen, "near ");
838 output[slen++] = '[';
839 if (ins.oprs[i].addr_size)
840 slen += snprintf(output + slen, outbufsize - slen, "%s",
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000841 (ins.oprs[i].addr_size == 64 ? "qword " :
842 ins.oprs[i].addr_size == 32 ? "dword " :
843 ins.oprs[i].addr_size == 16 ? "word " :
844 ""));
H. Peter Anvine2c80182005-01-15 22:15:51 +0000845 if (segover) {
846 slen +=
847 snprintf(output + slen, outbufsize - slen, "%s:",
848 segover);
849 segover = NULL;
850 }
851 if (ins.oprs[i].basereg != -1) {
852 slen += snprintf(output + slen, outbufsize - slen, "%s",
853 reg_names[(ins.oprs[i].basereg -
854 EXPR_REG_START)]);
855 started = TRUE;
856 }
857 if (ins.oprs[i].indexreg != -1) {
858 if (started)
859 output[slen++] = '+';
860 slen += snprintf(output + slen, outbufsize - slen, "%s",
861 reg_names[(ins.oprs[i].indexreg -
862 EXPR_REG_START)]);
863 if (ins.oprs[i].scale > 1)
864 slen +=
865 snprintf(output + slen, outbufsize - slen, "*%d",
866 ins.oprs[i].scale);
867 started = TRUE;
868 }
869 if (ins.oprs[i].segment & SEG_DISP8) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000870 int minus = 0;
871 int8_t offset = ins.oprs[i].offset;
872 if (offset < 0) {
873 minus = 1;
874 offset = -offset;
875 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000876 slen +=
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000877 snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx8"",
878 minus ? "-" : "+", offset);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000879 } else if (ins.oprs[i].segment & SEG_DISP16) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000880 int minus = 0;
881 int16_t offset = ins.oprs[i].offset;
882 if (offset < 0) {
883 minus = 1;
884 offset = -offset;
885 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000886 slen +=
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000887 snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx16"",
888 minus ? "-" : started ? "+" : "", offset);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000889 } else if (ins.oprs[i].segment & SEG_DISP32) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000890 char *prefix = "";
891 int32_t offset = ins.oprs[i].offset;
892 if (ins.oprs[i].basereg == R_RIP) {
893 prefix = ":";
894 } else if (offset < 0) {
895 offset = -offset;
896 prefix = "-";
897 } else {
898 prefix = started ? "+" : "";
899 }
900 slen +=
901 snprintf(output + slen, outbufsize - slen,
902 "%s0x%"PRIx32"", prefix, offset);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000903 }
904 output[slen++] = ']';
905 } else {
906 slen +=
907 snprintf(output + slen, outbufsize - slen, "<operand%d>",
908 i);
909 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000910 }
911 output[slen] = '\0';
H. Peter Anvine2c80182005-01-15 22:15:51 +0000912 if (segover) { /* unused segment override */
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000913 char *p = output;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000914 int count = slen + 1;
915 while (count--)
916 p[count + 3] = p[count];
917 strncpy(output, segover, 2);
918 output[2] = ' ';
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000919 }
920 return length;
921}
922
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000923int32_t eatbyte(uint8_t *data, char *output, int outbufsize)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000924{
Ed Beroset92348172004-12-15 18:27:50 +0000925 snprintf(output, outbufsize, "db 0x%02X", *data);
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000926 return 1;
927}