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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
H. Peter Anvinfe501952007-10-02 21:53:51 -070011#include "compiler.h"
12
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000013#include <stdio.h>
14#include <string.h>
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +000015#include <limits.h>
Keith Kaniosb7a89542007-04-12 02:40:54 +000016#include <inttypes.h>
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000017
18#include "nasm.h"
19#include "disasm.h"
20#include "sync.h"
21#include "insns.h"
22
23#include "names.c"
24
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000025/*
26 * Flags that go into the `segment' field of `insn' structures
27 * during disassembly.
28 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +000029#define SEG_RELATIVE 1
30#define SEG_32BIT 2
31#define SEG_RMREG 4
32#define SEG_DISP8 8
33#define SEG_DISP16 16
34#define SEG_DISP32 32
35#define SEG_NODISP 64
36#define SEG_SIGNED 128
37#define SEG_64BIT 256
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000038
H. Peter Anvin232badb2002-06-06 02:41:20 +000039#include "regdis.c"
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000040
H. Peter Anvin62cb6062007-09-11 22:44:03 +000041/*
42 * Prefix information
43 */
44struct prefix_info {
45 uint8_t osize; /* Operand size */
46 uint8_t asize; /* Address size */
47 uint8_t osp; /* Operand size prefix present */
48 uint8_t asp; /* Address size prefix present */
49 uint8_t rep; /* Rep prefix present */
50 uint8_t seg; /* Segment override prefix present */
51 uint8_t lock; /* Lock prefix present */
52 uint8_t rex; /* Rex prefix present */
53};
54
H. Peter Anvin0ee01422007-04-16 01:18:30 +000055#define getu8(x) (*(uint8_t *)(x))
56#if defined(__i386__) || defined(__x86_64__)
57/* Littleendian CPU which can handle unaligned references */
58#define getu16(x) (*(uint16_t *)(x))
59#define getu32(x) (*(uint32_t *)(x))
60#define getu64(x) (*(uint64_t *)(x))
61#else
62static uint16_t getu16(uint8_t *data)
63{
64 return (uint16_t)data[0] + ((uint16_t)data[1] << 8);
65}
66static uint32_t getu32(uint8_t *data)
67{
68 return (uint32_t)getu16(data) + ((uint32_t)getu16(data+2) << 16);
69}
70static uint64_t getu64(uint8_t *data)
71{
72 return (uint64_t)getu32(data) + ((uint64_t)getu32(data+4) << 32);
73}
74#endif
75
76#define gets8(x) ((int8_t)getu8(x))
77#define gets16(x) ((int16_t)getu16(x))
78#define gets32(x) ((int32_t)getu32(x))
79#define gets64(x) ((int64_t)getu64(x))
80
81/* Important: regval must already have been adjusted for rex extensions */
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +000082static enum reg_enum whichreg(int32_t regflags, int regval, int rex)
H. Peter Anvin0ee01422007-04-16 01:18:30 +000083{
H. Peter Anvin0da6b582007-09-12 20:32:39 -070084 if (!(regflags & (REGISTER|REGMEM)))
85 return 0; /* Registers not permissible?! */
86
87 regflags |= REGISTER;
88
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000089 if (!(REG_AL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000090 return R_AL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000091 if (!(REG_AX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000092 return R_AX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000093 if (!(REG_EAX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000094 return R_EAX;
H. Peter Anvin7cf03af2007-04-16 02:39:56 +000095 if (!(REG_RAX & ~regflags))
96 return R_RAX;
H. Peter Anvin10101f22003-02-24 23:22:45 +000097 if (!(REG_DL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +000098 return R_DL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +000099 if (!(REG_DX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000100 return R_DX;
H. Peter Anvin10101f22003-02-24 23:22:45 +0000101 if (!(REG_EDX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000102 return R_EDX;
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000103 if (!(REG_RDX & ~regflags))
104 return R_RDX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000105 if (!(REG_CL & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000106 return R_CL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000107 if (!(REG_CX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000108 return R_CX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000109 if (!(REG_ECX & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000110 return R_ECX;
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000111 if (!(REG_RCX & ~regflags))
112 return R_RCX;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000113 if (!(FPU0 & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000114 return R_ST0;
H. Peter Anvind7ed89e2002-04-30 20:52:08 +0000115 if (!(REG_CS & ~regflags))
H. Peter Anvin232badb2002-06-06 02:41:20 +0000116 return (regval == 1) ? R_CS : 0;
H. Peter Anvin76690a12002-04-30 20:52:49 +0000117 if (!(REG_DESS & ~regflags))
H. Peter Anvine2c80182005-01-15 22:15:51 +0000118 return (regval == 0 || regval == 2
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000119 || regval == 3 ? rd_sreg[regval] : 0);
H. Peter Anvin76690a12002-04-30 20:52:49 +0000120 if (!(REG_FSGS & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000121 return (regval == 4 || regval == 5 ? rd_sreg[regval] : 0);
H. Peter Anvin232badb2002-06-06 02:41:20 +0000122 if (!(REG_SEG67 & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000123 return (regval == 6 || regval == 7 ? rd_sreg[regval] : 0);
H. Peter Anvin232badb2002-06-06 02:41:20 +0000124
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000125 /* All the entries below look up regval in an 16-entry array */
126 if (regval < 0 || regval > 15)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000127 return 0;
H. Peter Anvin232badb2002-06-06 02:41:20 +0000128
H. Peter Anvin0da6b582007-09-12 20:32:39 -0700129 if (!(REG8 & ~regflags)) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000130 if (rex & REX_P)
131 return rd_reg8_rex[regval];
132 else
133 return rd_reg8[regval];
134 }
H. Peter Anvin0da6b582007-09-12 20:32:39 -0700135 if (!(REG16 & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000136 return rd_reg16[regval];
H. Peter Anvin0da6b582007-09-12 20:32:39 -0700137 if (!(REG32 & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000138 return rd_reg32[regval];
H. Peter Anvin0da6b582007-09-12 20:32:39 -0700139 if (!(REG64 & ~regflags))
H. Peter Anvinb061d592007-04-16 02:02:06 +0000140 return rd_reg64[regval];
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000141 if (!(REG_SREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000142 return rd_sreg[regval & 7]; /* Ignore REX */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000143 if (!(REG_CREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000144 return rd_creg[regval];
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000145 if (!(REG_DREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000146 return rd_dreg[regval];
147 if (!(REG_TREG & ~regflags)) {
148 if (rex & REX_P)
149 return 0; /* TR registers are ill-defined with rex */
150 return rd_treg[regval];
151 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000152 if (!(FPUREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000153 return rd_fpureg[regval & 7]; /* Ignore REX */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000154 if (!(MMXREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000155 return rd_mmxreg[regval & 7]; /* Ignore REX */
H. Peter Anvin4836e332002-04-30 20:56:43 +0000156 if (!(XMMREG & ~regflags))
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000157 return rd_xmmreg[regval];
H. Peter Anvin232badb2002-06-06 02:41:20 +0000158
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000159 return 0;
160}
161
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000162static const char *whichcond(int condval)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000163{
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000164 static int conds[] = {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000165 C_O, C_NO, C_C, C_NC, C_Z, C_NZ, C_NA, C_A,
166 C_S, C_NS, C_PE, C_PO, C_L, C_NL, C_NG, C_G
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000167 };
168 return conditions[conds[condval]];
169}
170
171/*
H. Peter Anvin7786c362007-09-17 18:45:44 -0700172 * Process a DREX suffix
173 */
174static uint8_t *do_drex(uint8_t *data, insn *ins)
175{
176 uint8_t drex = *data++;
177 operand *dst = &ins->oprs[ins->drexdst];
178
179 if ((drex & 8) != ((ins->rex & REX_OC) ? 8 : 0))
180 return NULL; /* OC0 mismatch */
181 ins->rex = (ins->rex & ~7) | (drex & 7);
H. Peter Anvin70653092007-10-19 14:42:29 -0700182
H. Peter Anvin7786c362007-09-17 18:45:44 -0700183 dst->segment = SEG_RMREG;
184 dst->basereg = drex >> 4;
185 return data;
186}
187
188
189/*
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000190 * Process an effective address (ModRM) specification.
191 */
Keith Kaniosb7a89542007-04-12 02:40:54 +0000192static uint8_t *do_ea(uint8_t *data, int modrm, int asize,
H. Peter Anvin7786c362007-09-17 18:45:44 -0700193 int segsize, operand * op, insn *ins)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000194{
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000195 int mod, rm, scale, index, base;
H. Peter Anvin7786c362007-09-17 18:45:44 -0700196 int rex;
197 uint8_t sib = 0;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000198
199 mod = (modrm >> 6) & 03;
200 rm = modrm & 07;
201
H. Peter Anvin7786c362007-09-17 18:45:44 -0700202 if (mod != 3 && rm == 4 && asize != 16)
203 sib = *data++;
204
205 if (ins->rex & REX_D) {
206 data = do_drex(data, ins);
207 if (!data)
208 return NULL;
209 }
210 rex = ins->rex;
211
H. Peter Anvine2c80182005-01-15 22:15:51 +0000212 if (mod == 3) { /* pure register version */
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000213 op->basereg = rm+(rex & REX_B ? 8 : 0);
H. Peter Anvine2c80182005-01-15 22:15:51 +0000214 op->segment |= SEG_RMREG;
215 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000216 }
217
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700218 op->disp_size = 0;
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +0000219 op->eaflags = 0;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000220
221 if (asize == 16) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000222 /*
223 * <mod> specifies the displacement size (none, byte or
224 * word), and <rm> specifies the register combination.
225 * Exception: mod=0,rm=6 does not specify [BP] as one might
226 * expect, but instead specifies [disp16].
227 */
228 op->indexreg = op->basereg = -1;
229 op->scale = 1; /* always, in 16 bits */
230 switch (rm) {
231 case 0:
232 op->basereg = R_BX;
233 op->indexreg = R_SI;
234 break;
235 case 1:
236 op->basereg = R_BX;
237 op->indexreg = R_DI;
238 break;
239 case 2:
240 op->basereg = R_BP;
241 op->indexreg = R_SI;
242 break;
243 case 3:
244 op->basereg = R_BP;
245 op->indexreg = R_DI;
246 break;
247 case 4:
248 op->basereg = R_SI;
249 break;
250 case 5:
251 op->basereg = R_DI;
252 break;
253 case 6:
254 op->basereg = R_BP;
255 break;
256 case 7:
257 op->basereg = R_BX;
258 break;
259 }
260 if (rm == 6 && mod == 0) { /* special case */
261 op->basereg = -1;
262 if (segsize != 16)
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700263 op->disp_size = 16;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000264 mod = 2; /* fake disp16 */
265 }
266 switch (mod) {
267 case 0:
268 op->segment |= SEG_NODISP;
269 break;
270 case 1:
271 op->segment |= SEG_DISP8;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000272 op->offset = (int8_t)*data++;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000273 break;
274 case 2:
275 op->segment |= SEG_DISP16;
276 op->offset = *data++;
277 op->offset |= ((unsigned)*data++) << 8;
278 break;
279 }
280 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000281 } else {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000282 /*
283 * Once again, <mod> specifies displacement size (this time
284 * none, byte or *dword*), while <rm> specifies the base
285 * register. Again, [EBP] is missing, replaced by a pure
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000286 * disp32 (this time that's mod=0,rm=*5*) in 32-bit mode,
287 * and RIP-relative addressing in 64-bit mode.
288 *
289 * However, rm=4
H. Peter Anvine2c80182005-01-15 22:15:51 +0000290 * indicates not a single base register, but instead the
291 * presence of a SIB byte...
292 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000293 int a64 = asize == 64;
294
H. Peter Anvine2c80182005-01-15 22:15:51 +0000295 op->indexreg = -1;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000296
297 if (a64)
298 op->basereg = rd_reg64[rm | ((rex & REX_B) ? 8 : 0)];
299 else
300 op->basereg = rd_reg32[rm | ((rex & REX_B) ? 8 : 0)];
301
H. Peter Anvine2c80182005-01-15 22:15:51 +0000302 if (rm == 5 && mod == 0) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000303 if (segsize == 64) {
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +0000304 op->eaflags |= EAF_REL;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000305 op->segment |= SEG_RELATIVE;
306 mod = 2; /* fake disp32 */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000307 }
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +0000308
309 if (asize != 64)
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700310 op->disp_size = asize;
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +0000311
312 op->basereg = -1;
313 mod = 2; /* fake disp32 */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000314 }
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000315
H. Peter Anvine2c80182005-01-15 22:15:51 +0000316 if (rm == 4) { /* process SIB */
H. Peter Anvin7786c362007-09-17 18:45:44 -0700317 scale = (sib >> 6) & 03;
318 index = (sib >> 3) & 07;
319 base = sib & 07;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000320
H. Peter Anvine2c80182005-01-15 22:15:51 +0000321 op->scale = 1 << scale;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000322
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000323 if (index == 4)
324 op->indexreg = -1; /* ESP/RSP/R12 cannot be an index */
325 else if (a64)
326 op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
327 else
328 op->indexreg = rd_reg64[index | ((rex & REX_X) ? 8 : 0)];
329
330 if (base == 5 && mod == 0) {
331 op->basereg = -1;
332 mod = 2; /* Fake disp32 */
333 } else if (a64)
334 op->basereg = rd_reg64[base | ((rex & REX_B) ? 8 : 0)];
335 else
336 op->basereg = rd_reg32[base | ((rex & REX_B) ? 8 : 0)];
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +0000337
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800338 if (segsize == 16)
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700339 op->disp_size = 32;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000340 }
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000341
H. Peter Anvine2c80182005-01-15 22:15:51 +0000342 switch (mod) {
343 case 0:
344 op->segment |= SEG_NODISP;
345 break;
346 case 1:
347 op->segment |= SEG_DISP8;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000348 op->offset = gets8(data);
349 data++;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000350 break;
351 case 2:
352 op->segment |= SEG_DISP32;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000353 op->offset = getu32(data);
354 data += 4;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000355 break;
356 }
357 return data;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000358 }
359}
360
361/*
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000362 * Determine whether the instruction template in t corresponds to the data
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000363 * stream in data. Return the number of bytes matched if so.
364 */
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800365#define case4(x) case (x): case (x)+1: case (x)+2: case (x)+3
366
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000367static int matches(const struct itemplate *t, uint8_t *data,
368 const struct prefix_info *prefix, int segsize, insn *ins)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000369{
Keith Kaniosb7a89542007-04-12 02:40:54 +0000370 uint8_t *r = (uint8_t *)(t->code);
371 uint8_t *origdata = data;
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700372 bool a_used = false, o_used = false;
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000373 enum prefixes drep = 0;
374 uint8_t lock = prefix->lock;
375 int osize = prefix->osize;
376 int asize = prefix->asize;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800377 int i, c;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800378 struct operand *opx;
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +0000379
H. Peter Anvin7eb4a382007-09-17 15:49:30 -0700380 for (i = 0; i < MAX_OPERANDS; i++) {
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700381 ins->oprs[i].segment = ins->oprs[i].disp_size =
H. Peter Anvin7eb4a382007-09-17 15:49:30 -0700382 (segsize == 64 ? SEG_64BIT : segsize == 32 ? SEG_32BIT : 0);
383 }
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +0000384 ins->condition = -1;
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000385 ins->rex = prefix->rex;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -0800386 memset(ins->prefixes, 0, sizeof ins->prefixes);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000387
H. Peter Anvin0db11e22007-04-17 20:23:11 +0000388 if (t->flags & (segsize == 64 ? IF_NOLONG : IF_LONG))
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700389 return false;
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000390
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000391 if (prefix->rep == 0xF2)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000392 drep = P_REPNE;
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000393 else if (prefix->rep == 0xF3)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000394 drep = P_REP;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000395
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800396 while ((c = *r++) != 0) {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800397 opx = &ins->oprs[c & 3];
398
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800399 switch (c) {
400 case 01:
401 case 02:
402 case 03:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000403 while (c--)
404 if (*r++ != *data++)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700405 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800406 break;
407
408 case 04:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000409 switch (*data++) {
410 case 0x07:
411 ins->oprs[0].basereg = 0;
412 break;
413 case 0x17:
414 ins->oprs[0].basereg = 2;
415 break;
416 case 0x1F:
417 ins->oprs[0].basereg = 3;
418 break;
419 default:
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700420 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000421 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800422 break;
423
424 case 05:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000425 switch (*data++) {
426 case 0xA1:
427 ins->oprs[0].basereg = 4;
428 break;
429 case 0xA9:
430 ins->oprs[0].basereg = 5;
431 break;
432 default:
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700433 return false;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000434 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800435 break;
436
437 case 06:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000438 switch (*data++) {
439 case 0x06:
440 ins->oprs[0].basereg = 0;
441 break;
442 case 0x0E:
443 ins->oprs[0].basereg = 1;
444 break;
445 case 0x16:
446 ins->oprs[0].basereg = 2;
447 break;
448 case 0x1E:
449 ins->oprs[0].basereg = 3;
450 break;
451 default:
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700452 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000453 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800454 break;
455
456 case 07:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000457 switch (*data++) {
458 case 0xA0:
459 ins->oprs[0].basereg = 4;
460 break;
461 case 0xA8:
462 ins->oprs[0].basereg = 5;
463 break;
464 default:
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700465 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000466 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800467 break;
468
469 case4(010):
470 {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000471 int t = *r++, d = *data++;
472 if (d < t || d > t + 7)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700473 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000474 else {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800475 opx->basereg = (d-t)+
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000476 (ins->rex & REX_B ? 8 : 0);
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800477 opx->segment |= SEG_RMREG;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000478 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800479 break;
480 }
481
482 case4(014):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800483 opx->offset = (int8_t)*data++;
484 opx->segment |= SEG_SIGNED;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800485 break;
486
487 case4(020):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800488 opx->offset = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800489 break;
490
491 case4(024):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800492 opx->offset = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800493 break;
494
495 case4(030):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800496 opx->offset = getu16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000497 data += 2;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800498 break;
499
500 case4(034):
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000501 if (osize == 32) {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800502 opx->offset = getu32(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000503 data += 4;
504 } else {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800505 opx->offset = getu16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000506 data += 2;
507 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000508 if (segsize != asize)
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800509 opx->disp_size = asize;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800510 break;
511
512 case4(040):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800513 opx->offset = getu32(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000514 data += 4;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800515 break;
516
517 case4(044):
H. Peter Anvinb061d592007-04-16 02:02:06 +0000518 switch (asize) {
519 case 16:
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800520 opx->offset = getu16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000521 data += 2;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800522 if (segsize != 16)
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800523 opx->disp_size = 16;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000524 break;
525 case 32:
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800526 opx->offset = getu32(data);
H. Peter Anvinb061d592007-04-16 02:02:06 +0000527 data += 4;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800528 if (segsize == 16)
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800529 opx->disp_size = 32;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000530 break;
531 case 64:
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800532 opx->offset = getu64(data);
533 opx->disp_size = 64;
H. Peter Anvinb061d592007-04-16 02:02:06 +0000534 data += 8;
535 break;
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000536 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800537 break;
538
539 case4(050):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800540 opx->offset = gets8(data++);
541 opx->segment |= SEG_RELATIVE;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800542 break;
543
544 case4(054):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800545 opx->offset = getu64(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000546 data += 8;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800547 break;
548
549 case4(060):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800550 opx->offset = gets16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000551 data += 2;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800552 opx->segment |= SEG_RELATIVE;
553 opx->segment &= ~SEG_32BIT;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800554 break;
555
556 case4(064):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800557 opx->segment |= SEG_RELATIVE;
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000558 if (osize == 16) {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800559 opx->offset = getu16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000560 data += 2;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800561 opx->segment &= ~(SEG_32BIT|SEG_64BIT);
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000562 } else if (osize == 32) {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800563 opx->offset = getu32(data);
H. Peter Anvin7cf03af2007-04-16 02:39:56 +0000564 data += 4;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800565 opx->segment &= ~SEG_64BIT;
566 opx->segment |= SEG_32BIT;
H. Peter Anvin70653092007-10-19 14:42:29 -0700567 }
H. Peter Anvine2c80182005-01-15 22:15:51 +0000568 if (segsize != osize) {
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800569 opx->type =
570 (opx->type & ~SIZE_MASK)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000571 | ((osize == 16) ? BITS16 : BITS32);
572 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800573 break;
574
575 case4(070):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800576 opx->offset = getu32(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000577 data += 4;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800578 opx->segment |= SEG_32BIT | SEG_RELATIVE;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800579 break;
580
581 case4(0100):
582 case4(0110):
583 case4(0120):
584 case4(0130):
585 {
586 int modrm = *data++;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800587 opx->segment |= SEG_RMREG;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000588 data = do_ea(data, modrm, asize, segsize,
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800589 &ins->oprs[(c >> 3) & 3], ins);
H. Peter Anvin7786c362007-09-17 18:45:44 -0700590 if (!data)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700591 return false;
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800592 opx->basereg = ((modrm >> 3)&7)+
H. Peter Anvin7786c362007-09-17 18:45:44 -0700593 (ins->rex & REX_R ? 8 : 0);
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800594 break;
595 }
596
597 case4(0140):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800598 opx->offset = getu16(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000599 data += 2;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800600 break;
601
602 case4(0150):
H. Peter Anvina5fb9082007-11-12 23:00:31 -0800603 opx->offset = getu32(data);
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000604 data += 4;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800605 break;
606
607 case4(0160):
608 ins->rex |= REX_D;
H. Peter Anvin7786c362007-09-17 18:45:44 -0700609 ins->drexdst = c & 3;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800610 break;
611
612 case4(0164):
613 ins->rex |= REX_D|REX_OC;
614 ins->drexdst = c & 3;
615 break;
616
617 case 0170:
H. Peter Anvin7eb4a382007-09-17 15:49:30 -0700618 if (*data++)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700619 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800620 break;
621
622 case 0171:
H. Peter Anvin7786c362007-09-17 18:45:44 -0700623 data = do_drex(data, ins);
624 if (!data)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700625 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800626 break;
627
628 case4(0200):
629 case4(0204):
630 case4(0210):
631 case4(0214):
632 case4(0220):
633 case4(0224):
634 case4(0230):
635 case4(0234):
636 {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000637 int modrm = *data++;
638 if (((modrm >> 3) & 07) != (c & 07))
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700639 return false; /* spare field doesn't match up */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000640 data = do_ea(data, modrm, asize, segsize,
H. Peter Anvin7786c362007-09-17 18:45:44 -0700641 &ins->oprs[(c >> 3) & 07], ins);
642 if (!data)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700643 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800644 break;
645 }
646
647 case 0310:
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000648 if (asize != 16)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700649 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000650 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700651 a_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800652 break;
653
654 case 0311:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000655 if (asize == 16)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700656 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000657 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700658 a_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800659 break;
660
661 case 0312:
H. Peter Anvine2c80182005-01-15 22:15:51 +0000662 if (asize != segsize)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700663 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000664 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700665 a_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800666 break;
667
668 case 0313:
H. Peter Anvince2b3972007-05-30 22:21:11 +0000669 if (asize != 64)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700670 return false;
H. Peter Anvince2b3972007-05-30 22:21:11 +0000671 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700672 a_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800673 break;
674
675 case 0314:
H. Peter Anvin23440102007-11-12 21:02:33 -0800676 if (prefix->rex & REX_B)
677 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800678 break;
679
680 case 0315:
H. Peter Anvin23440102007-11-12 21:02:33 -0800681 if (prefix->rex & REX_X)
682 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800683 break;
684
685 case 0316:
H. Peter Anvin23440102007-11-12 21:02:33 -0800686 if (prefix->rex & REX_R)
687 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800688 break;
689
690 case 0317:
H. Peter Anvin23440102007-11-12 21:02:33 -0800691 if (prefix->rex & REX_W)
692 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800693 break;
694
695 case 0320:
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000696 if (osize != 16)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700697 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000698 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700699 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800700 break;
701
702 case 0321:
H. Peter Anvinb061d592007-04-16 02:02:06 +0000703 if (osize != 32)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700704 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000705 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700706 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800707 break;
708
709 case 0322:
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000710 if (osize != (segsize == 16) ? 16 : 32)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700711 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000712 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700713 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800714 break;
715
716 case 0323:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000717 ins->rex |= REX_W; /* 64-bit only instruction */
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000718 osize = 64;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -0800719 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800720 break;
721
722 case 0324:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000723 if (!(ins->rex & (REX_P|REX_W)) || osize != 64)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700724 return false;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -0800725 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800726 break;
727
728 case 0330:
729 {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000730 int t = *r++, d = *data++;
731 if (d < t || d > t + 15)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700732 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000733 else
734 ins->condition = d - t;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800735 break;
736 }
737
738 case 0331:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000739 if (prefix->rep)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700740 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800741 break;
742
743 case 0332:
H. Peter Anvincb9b6902007-09-12 21:58:51 -0700744 if (prefix->rep != 0xF2)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700745 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800746 break;
747
748 case 0333:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000749 if (prefix->rep != 0xF3)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700750 return false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000751 drep = 0;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800752 break;
753
754 case 0334:
H. Peter Anvin0db11e22007-04-17 20:23:11 +0000755 if (lock) {
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000756 ins->rex |= REX_R;
H. Peter Anvin0db11e22007-04-17 20:23:11 +0000757 lock = 0;
758 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800759 break;
760
761 case 0335:
H. Peter Anvincb9b6902007-09-12 21:58:51 -0700762 if (drep == P_REP)
763 drep = P_REPE;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800764 break;
765
766 case 0340:
767 return false;
768
769 case 0364:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000770 if (prefix->osp)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700771 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800772 break;
773
774 case 0365:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000775 if (prefix->asp)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700776 return false;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800777 break;
778
779 case 0366:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000780 if (!prefix->osp)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700781 return false;
782 o_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800783 break;
784
785 case 0367:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000786 if (!prefix->asp)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700787 return false;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -0800788 a_used = true;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800789 break;
790
791 default:
792 return false; /* Unknown code */
H. Peter Anvin0db11e22007-04-17 20:23:11 +0000793 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000794 }
795
H. Peter Anvin7786c362007-09-17 18:45:44 -0700796 /* REX cannot be combined with DREX */
797 if ((ins->rex & REX_D) && (prefix->rex))
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700798 return false;
H. Peter Anvin7786c362007-09-17 18:45:44 -0700799
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000800 /*
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000801 * Check for unused rep or a/o prefixes.
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000802 */
H. Peter Anvinc5b9ce02007-09-22 21:49:51 -0700803 for (i = 0; i < t->operands; i++) {
804 if (ins->oprs[i].segment != SEG_RMREG)
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700805 a_used = true;
H. Peter Anvinc5b9ce02007-09-22 21:49:51 -0700806 }
807
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700808 if (lock) {
809 if (ins->prefixes[PPS_LREP])
810 return false;
811 ins->prefixes[PPS_LREP] = P_LOCK;
812 }
813 if (drep) {
814 if (ins->prefixes[PPS_LREP])
815 return false;
816 ins->prefixes[PPS_LREP] = drep;
817 }
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -0800818 if (!o_used) {
819 if (osize != ((segsize == 16) ? 16 : 32)) {
820 enum prefixes pfx = 0;
821
822 switch (osize) {
823 case 16:
824 pfx = P_O16;
825 break;
826 case 32:
827 pfx = P_O32;
828 break;
829 case 64:
830 pfx = P_O64;
831 break;
832 }
833
834 if (ins->prefixes[PPS_OSIZE])
835 return false;
836 ins->prefixes[PPS_OSIZE] = pfx;
837 }
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700838 }
839 if (!a_used && asize != segsize) {
840 if (ins->prefixes[PPS_ASIZE])
841 return false;
842 ins->prefixes[PPS_ASIZE] = asize == 16 ? P_A16 : P_A32;
843 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000844
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000845 /* Fix: check for redundant REX prefixes */
846
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000847 return data - origdata;
848}
849
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000850int32_t disasm(uint8_t *data, char *output, int outbufsize, int segsize,
Keith Kaniosb7a89542007-04-12 02:40:54 +0000851 int32_t offset, int autosync, uint32_t prefer)
H. Peter Anvineba20a72002-04-30 20:53:55 +0000852{
H. Peter Anvin3360d792007-09-11 04:16:57 +0000853 const struct itemplate * const *p, * const *best_p;
H. Peter Anvin19e20102007-09-18 15:08:20 -0700854 const struct disasm_index *ix;
855 uint8_t *dp;
H. Peter Anvin4836e332002-04-30 20:56:43 +0000856 int length, best_length = 0;
Keith Kaniosa6dfa782007-04-13 16:47:53 +0000857 char *segover;
H. Peter Anvin19e20102007-09-18 15:08:20 -0700858 int i, slen, colon, n;
Keith Kaniosb7a89542007-04-12 02:40:54 +0000859 uint8_t *origdata;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000860 int works;
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000861 insn tmp_ins, ins;
Keith Kaniosb7a89542007-04-12 02:40:54 +0000862 uint32_t goodness, best;
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000863 int best_pref;
864 struct prefix_info prefix;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800865 bool end_prefix;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000866
H. Peter Anvinbfb888c2007-09-11 04:26:44 +0000867 memset(&ins, 0, sizeof ins);
868
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000869 /*
870 * Scan for prefixes.
871 */
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000872 memset(&prefix, 0, sizeof prefix);
873 prefix.asize = segsize;
874 prefix.osize = (segsize == 64) ? 32 : segsize;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000875 segover = NULL;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000876 origdata = data;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800877
878 for (end_prefix = false; !end_prefix; ) {
879 switch (*data) {
880 case 0xF2:
881 case 0xF3:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000882 prefix.rep = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800883 break;
884 case 0xF0:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000885 prefix.lock = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800886 break;
887 case 0x2E:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000888 segover = "cs", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800889 break;
890 case 0x36:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000891 segover = "ss", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800892 break;
893 case 0x3E:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000894 segover = "ds", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800895 break;
896 case 0x26:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000897 segover = "es", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800898 break;
899 case 0x64:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000900 segover = "fs", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800901 break;
902 case 0x65:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000903 segover = "gs", prefix.seg = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800904 break;
905 case 0x66:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000906 prefix.osize = (segsize == 16) ? 32 : 16;
907 prefix.osp = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800908 break;
909 case 0x67:
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000910 prefix.asize = (segsize == 32) ? 16 : 32;
911 prefix.asp = *data++;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800912 break;
913 default:
914 if (segsize == 64 && (*data & 0xf0) == REX_P) {
915 prefix.rex = *data++;
916 if (prefix.rex & REX_W)
917 prefix.osize = 64;
918 end_prefix = true;
919 } else {
920 end_prefix = true;
921 }
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000922 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000923 }
924
H. Peter Anvin0ee01422007-04-16 01:18:30 +0000925 best = -1; /* Worst possible */
H. Peter Anvin4836e332002-04-30 20:56:43 +0000926 best_p = NULL;
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +0000927 best_pref = INT_MAX;
928
H. Peter Anvin19e20102007-09-18 15:08:20 -0700929 dp = data;
930 ix = itable + *dp++;
Charles Crayne46b31b02007-10-18 21:17:20 -0700931 while (ix->n == -1) {
H. Peter Anvin19e20102007-09-18 15:08:20 -0700932 ix = (const struct disasm_index *)ix->p + *dp++;
933 }
934
935 p = (const struct itemplate * const *)ix->p;
936 for (n = ix->n; n; n--, p++) {
H. Peter Anvin62cb6062007-09-11 22:44:03 +0000937 if ((length = matches(*p, data, &prefix, segsize, &tmp_ins))) {
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700938 works = true;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000939 /*
940 * Final check to make sure the types of r/m match up.
H. Peter Anvindbf130e2007-05-30 00:18:26 +0000941 * XXX: Need to make sure this is actually correct.
H. Peter Anvine2c80182005-01-15 22:15:51 +0000942 */
943 for (i = 0; i < (*p)->operands; i++) {
H. Peter Anvin7786c362007-09-17 18:45:44 -0700944 if (!((*p)->opd[i] & SAME_AS) &&
945 (
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800946 /* If it's a mem-only EA but we have a
947 register, die. */
H. Peter Anvin7786c362007-09-17 18:45:44 -0700948 ((tmp_ins.oprs[i].segment & SEG_RMREG) &&
949 !(MEMORY & ~(*p)->opd[i])) ||
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800950 /* If it's a reg-only EA but we have a memory
951 ref, die. */
H. Peter Anvin7786c362007-09-17 18:45:44 -0700952 (!(tmp_ins.oprs[i].segment & SEG_RMREG) &&
953 !(REG_EA & ~(*p)->opd[i]) &&
954 !((*p)->opd[i] & REG_SMASK)) ||
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -0800955 /* Register type mismatch (eg FS vs REG_DESS):
956 die. */
H. Peter Anvin7786c362007-09-17 18:45:44 -0700957 ((((*p)->opd[i] & (REGISTER | FPUREG)) ||
958 (tmp_ins.oprs[i].segment & SEG_RMREG)) &&
959 !whichreg((*p)->opd[i],
960 tmp_ins.oprs[i].basereg, tmp_ins.rex))
961 )) {
H. Peter Anvin6867acc2007-10-10 14:58:45 -0700962 works = false;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000963 break;
964 }
965 }
966
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +0000967 /*
968 * Note: we always prefer instructions which incorporate
969 * prefixes in the instructions themselves. This is to allow
970 * e.g. PAUSE to be preferred to REP NOP, and deal with
971 * MMX/SSE instructions where prefixes are used to select
972 * between MMX and SSE register sets or outright opcode
973 * selection.
974 */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000975 if (works) {
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700976 int i, nprefix;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000977 goodness = ((*p)->flags & IF_PFMASK) ^ prefer;
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700978 nprefix = 0;
979 for (i = 0; i < MAXPREFIX; i++)
980 if (tmp_ins.prefixes[i])
981 nprefix++;
982 if (nprefix < best_pref ||
983 (nprefix == best_pref && goodness < best)) {
H. Peter Anvine2c80182005-01-15 22:15:51 +0000984 /* This is the best one found so far */
985 best = goodness;
986 best_p = p;
H. Peter Anvinde4b89b2007-10-01 15:41:25 -0700987 best_pref = nprefix;
H. Peter Anvine2c80182005-01-15 22:15:51 +0000988 best_length = length;
989 ins = tmp_ins;
990 }
991 }
992 }
H. Peter Anvin4836e332002-04-30 20:56:43 +0000993 }
H. Peter Anvineba20a72002-04-30 20:53:55 +0000994
H. Peter Anvinef7468f2002-04-30 20:57:59 +0000995 if (!best_p)
H. Peter Anvine2c80182005-01-15 22:15:51 +0000996 return 0; /* no instruction was matched */
H. Peter Anvinea6e34d2002-04-30 20:51:32 +0000997
H. Peter Anvin4836e332002-04-30 20:56:43 +0000998 /* Pick the best match */
H. Peter Anvine2c80182005-01-15 22:15:51 +0000999 p = best_p;
H. Peter Anvin4836e332002-04-30 20:56:43 +00001000 length = best_length;
1001
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001002 slen = 0;
1003
Ed Beroset64ab5192004-12-15 23:32:57 +00001004 /* TODO: snprintf returns the value that the string would have if
H. Peter Anvin70653092007-10-19 14:42:29 -07001005 * the buffer were long enough, and not the actual length of
H. Peter Anvine2c80182005-01-15 22:15:51 +00001006 * the returned string, so each instance of using the return
1007 * value of snprintf should actually be checked to assure that
1008 * the return value is "sane." Maybe a macro wrapper could
1009 * be used for that purpose.
1010 */
H. Peter Anvinde4b89b2007-10-01 15:41:25 -07001011 for (i = 0; i < MAXPREFIX; i++)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001012 switch (ins.prefixes[i]) {
H. Peter Anvin0db11e22007-04-17 20:23:11 +00001013 case P_LOCK:
1014 slen += snprintf(output + slen, outbufsize - slen, "lock ");
1015 break;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001016 case P_REP:
1017 slen += snprintf(output + slen, outbufsize - slen, "rep ");
1018 break;
1019 case P_REPE:
1020 slen += snprintf(output + slen, outbufsize - slen, "repe ");
1021 break;
1022 case P_REPNE:
1023 slen += snprintf(output + slen, outbufsize - slen, "repne ");
1024 break;
1025 case P_A16:
1026 slen += snprintf(output + slen, outbufsize - slen, "a16 ");
1027 break;
1028 case P_A32:
1029 slen += snprintf(output + slen, outbufsize - slen, "a32 ");
1030 break;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -08001031 case P_A64:
1032 slen += snprintf(output + slen, outbufsize - slen, "a64 ");
1033 break;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001034 case P_O16:
1035 slen += snprintf(output + slen, outbufsize - slen, "o16 ");
1036 break;
1037 case P_O32:
1038 slen += snprintf(output + slen, outbufsize - slen, "o32 ");
1039 break;
H. Peter Anvinbb72f7f2007-11-12 22:55:27 -08001040 case P_O64:
1041 slen += snprintf(output + slen, outbufsize - slen, "o64 ");
1042 break;
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +00001043 default:
1044 break;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001045 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001046
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +00001047 for (i = 0; i < (int)elements(ico); i++)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001048 if ((*p)->opcode == ico[i]) {
1049 slen +=
1050 snprintf(output + slen, outbufsize - slen, "%s%s", icn[i],
1051 whichcond(ins.condition));
1052 break;
1053 }
H. Peter Anvin2ba7ed72007-09-11 22:13:17 +00001054 if (i >= (int)elements(ico))
H. Peter Anvine2c80182005-01-15 22:15:51 +00001055 slen +=
1056 snprintf(output + slen, outbufsize - slen, "%s",
1057 insn_names[(*p)->opcode]);
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001058 colon = false;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001059 length += data - origdata; /* fix up for prefixes */
1060 for (i = 0; i < (*p)->operands; i++) {
H. Peter Anvin7786c362007-09-17 18:45:44 -07001061 opflags_t t = (*p)->opd[i];
1062 const operand *o = &ins.oprs[i];
1063 int64_t offs;
1064
1065 if (t & SAME_AS) {
1066 o = &ins.oprs[t & ~SAME_AS];
1067 t = (*p)->opd[t & ~SAME_AS];
1068 }
1069
H. Peter Anvine2c80182005-01-15 22:15:51 +00001070 output[slen++] = (colon ? ':' : i == 0 ? ' ' : ',');
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001071
H. Peter Anvin7786c362007-09-17 18:45:44 -07001072 offs = o->offset;
1073 if (o->segment & SEG_RELATIVE) {
1074 offs += offset + length;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001075 /*
1076 * sort out wraparound
1077 */
H. Peter Anvin7786c362007-09-17 18:45:44 -07001078 if (!(o->segment & (SEG_32BIT|SEG_64BIT)))
1079 offs &= 0xffff;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001080 /*
1081 * add sync marker, if autosync is on
1082 */
1083 if (autosync)
H. Peter Anvin7786c362007-09-17 18:45:44 -07001084 add_sync(offs, 0L);
H. Peter Anvine2c80182005-01-15 22:15:51 +00001085 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001086
H. Peter Anvin7786c362007-09-17 18:45:44 -07001087 if (t & COLON)
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001088 colon = true;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001089 else
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001090 colon = false;
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001091
H. Peter Anvin7786c362007-09-17 18:45:44 -07001092 if ((t & (REGISTER | FPUREG)) ||
1093 (o->segment & SEG_RMREG)) {
1094 enum reg_enum reg;
1095 reg = whichreg(t, o->basereg, ins.rex);
1096 if (t & TO)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001097 slen += snprintf(output + slen, outbufsize - slen, "to ");
1098 slen += snprintf(output + slen, outbufsize - slen, "%s",
H. Peter Anvin7786c362007-09-17 18:45:44 -07001099 reg_names[reg - EXPR_REG_START]);
1100 } else if (!(UNITY & ~t)) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001101 output[slen++] = '1';
H. Peter Anvin7786c362007-09-17 18:45:44 -07001102 } else if (t & IMMEDIATE) {
1103 if (t & BITS8) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001104 slen +=
1105 snprintf(output + slen, outbufsize - slen, "byte ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001106 if (o->segment & SEG_SIGNED) {
1107 if (offs < 0) {
1108 offs *= -1;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001109 output[slen++] = '-';
1110 } else
1111 output[slen++] = '+';
1112 }
H. Peter Anvin7786c362007-09-17 18:45:44 -07001113 } else if (t & BITS16) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001114 slen +=
1115 snprintf(output + slen, outbufsize - slen, "word ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001116 } else if (t & BITS32) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001117 slen +=
1118 snprintf(output + slen, outbufsize - slen, "dword ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001119 } else if (t & BITS64) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001120 slen +=
1121 snprintf(output + slen, outbufsize - slen, "qword ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001122 } else if (t & NEAR) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001123 slen +=
1124 snprintf(output + slen, outbufsize - slen, "near ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001125 } else if (t & SHORT) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001126 slen +=
1127 snprintf(output + slen, outbufsize - slen, "short ");
1128 }
1129 slen +=
Keith Kanios93f2e9a2007-04-14 00:10:59 +00001130 snprintf(output + slen, outbufsize - slen, "0x%"PRIx64"",
H. Peter Anvin7786c362007-09-17 18:45:44 -07001131 offs);
1132 } else if (!(MEM_OFFS & ~t)) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001133 slen +=
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001134 snprintf(output + slen, outbufsize - slen,
1135 "[%s%s%s0x%"PRIx64"]",
H. Peter Anvin62cb6062007-09-11 22:44:03 +00001136 (segover ? segover : ""),
1137 (segover ? ":" : ""),
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001138 (o->disp_size == 64 ? "qword " :
1139 o->disp_size == 32 ? "dword " :
1140 o->disp_size == 16 ? "word " : ""), offs);
H. Peter Anvine2c80182005-01-15 22:15:51 +00001141 segover = NULL;
H. Peter Anvin7786c362007-09-17 18:45:44 -07001142 } else if (!(REGMEM & ~t)) {
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001143 int started = false;
H. Peter Anvin7786c362007-09-17 18:45:44 -07001144 if (t & BITS8)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001145 slen +=
1146 snprintf(output + slen, outbufsize - slen, "byte ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001147 if (t & BITS16)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001148 slen +=
1149 snprintf(output + slen, outbufsize - slen, "word ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001150 if (t & BITS32)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001151 slen +=
1152 snprintf(output + slen, outbufsize - slen, "dword ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001153 if (t & BITS64)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001154 slen +=
1155 snprintf(output + slen, outbufsize - slen, "qword ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001156 if (t & BITS80)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001157 slen +=
1158 snprintf(output + slen, outbufsize - slen, "tword ");
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001159 if (t & BITS128)
1160 slen +=
1161 snprintf(output + slen, outbufsize - slen, "oword ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001162 if (t & FAR)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001163 slen += snprintf(output + slen, outbufsize - slen, "far ");
H. Peter Anvin7786c362007-09-17 18:45:44 -07001164 if (t & NEAR)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001165 slen +=
1166 snprintf(output + slen, outbufsize - slen, "near ");
1167 output[slen++] = '[';
H. Peter Anvinde4b89b2007-10-01 15:41:25 -07001168 if (o->disp_size)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001169 slen += snprintf(output + slen, outbufsize - slen, "%s",
H. Peter Anvinde4b89b2007-10-01 15:41:25 -07001170 (o->disp_size == 64 ? "qword " :
1171 o->disp_size == 32 ? "dword " :
1172 o->disp_size == 16 ? "word " :
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001173 ""));
H. Peter Anvin7786c362007-09-17 18:45:44 -07001174 if (o->eaflags & EAF_REL)
H. Peter Anvin99c4ecd2007-08-28 23:06:00 +00001175 slen += snprintf(output + slen, outbufsize - slen, "rel ");
H. Peter Anvine2c80182005-01-15 22:15:51 +00001176 if (segover) {
1177 slen +=
1178 snprintf(output + slen, outbufsize - slen, "%s:",
1179 segover);
1180 segover = NULL;
1181 }
H. Peter Anvin7786c362007-09-17 18:45:44 -07001182 if (o->basereg != -1) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001183 slen += snprintf(output + slen, outbufsize - slen, "%s",
H. Peter Anvin7786c362007-09-17 18:45:44 -07001184 reg_names[(o->basereg -
H. Peter Anvine2c80182005-01-15 22:15:51 +00001185 EXPR_REG_START)]);
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001186 started = true;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001187 }
H. Peter Anvin7786c362007-09-17 18:45:44 -07001188 if (o->indexreg != -1) {
H. Peter Anvine2c80182005-01-15 22:15:51 +00001189 if (started)
1190 output[slen++] = '+';
1191 slen += snprintf(output + slen, outbufsize - slen, "%s",
H. Peter Anvin7786c362007-09-17 18:45:44 -07001192 reg_names[(o->indexreg -
H. Peter Anvine2c80182005-01-15 22:15:51 +00001193 EXPR_REG_START)]);
H. Peter Anvin7786c362007-09-17 18:45:44 -07001194 if (o->scale > 1)
H. Peter Anvine2c80182005-01-15 22:15:51 +00001195 slen +=
1196 snprintf(output + slen, outbufsize - slen, "*%d",
H. Peter Anvin7786c362007-09-17 18:45:44 -07001197 o->scale);
H. Peter Anvin6867acc2007-10-10 14:58:45 -07001198 started = true;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001199 }
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001200
1201
H. Peter Anvin7786c362007-09-17 18:45:44 -07001202 if (o->segment & SEG_DISP8) {
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001203 const char *prefix;
1204 uint8_t offset = offs;
1205 if ((int8_t)offset < 0) {
1206 prefix = "-";
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001207 offset = -offset;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001208 } else {
1209 prefix = "+";
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001210 }
H. Peter Anvine2c80182005-01-15 22:15:51 +00001211 slen +=
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001212 snprintf(output + slen, outbufsize - slen, "%s0x%"PRIx8"",
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001213 prefix, offset);
H. Peter Anvin7786c362007-09-17 18:45:44 -07001214 } else if (o->segment & SEG_DISP16) {
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001215 const char *prefix;
1216 uint16_t offset = offs;
1217 if ((int16_t)offset < 0 && started) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001218 offset = -offset;
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001219 prefix = "-";
1220 } else {
1221 prefix = started ? "+" : "";
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001222 }
H. Peter Anvine2c80182005-01-15 22:15:51 +00001223 slen +=
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001224 snprintf(output + slen, outbufsize - slen,
1225 "%s0x%"PRIx16"", prefix, offset);
H. Peter Anvin7786c362007-09-17 18:45:44 -07001226 } else if (o->segment & SEG_DISP32) {
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001227 if (prefix.asize == 64) {
1228 const char *prefix;
1229 uint64_t offset = (int64_t)(int32_t)offs;
1230 if ((int32_t)offs < 0 && started) {
1231 offset = -offset;
1232 prefix = "-";
1233 } else {
1234 prefix = started ? "+" : "";
1235 }
1236 slen +=
1237 snprintf(output + slen, outbufsize - slen,
1238 "%s0x%"PRIx64"", prefix, offset);
1239 } else {
1240 const char *prefix;
1241 uint32_t offset = offs;
1242 if ((int32_t) offset < 0 && started) {
H. Peter Anvin0ee01422007-04-16 01:18:30 +00001243 offset = -offset;
1244 prefix = "-";
1245 } else {
1246 prefix = started ? "+" : "";
1247 }
1248 slen +=
1249 snprintf(output + slen, outbufsize - slen,
1250 "%s0x%"PRIx32"", prefix, offset);
H. Peter Anvine8cdcdc2007-11-12 21:57:00 -08001251 }
H. Peter Anvine2c80182005-01-15 22:15:51 +00001252 }
1253 output[slen++] = ']';
1254 } else {
1255 slen +=
1256 snprintf(output + slen, outbufsize - slen, "<operand%d>",
1257 i);
1258 }
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001259 }
1260 output[slen] = '\0';
H. Peter Anvine2c80182005-01-15 22:15:51 +00001261 if (segover) { /* unused segment override */
Keith Kaniosa6dfa782007-04-13 16:47:53 +00001262 char *p = output;
H. Peter Anvine2c80182005-01-15 22:15:51 +00001263 int count = slen + 1;
1264 while (count--)
1265 p[count + 3] = p[count];
1266 strncpy(output, segover, 2);
1267 output[2] = ' ';
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001268 }
1269 return length;
1270}
1271
Keith Kaniosa6dfa782007-04-13 16:47:53 +00001272int32_t eatbyte(uint8_t *data, char *output, int outbufsize)
H. Peter Anvineba20a72002-04-30 20:53:55 +00001273{
Ed Beroset92348172004-12-15 18:27:50 +00001274 snprintf(output, outbufsize, "db 0x%02X", *data);
H. Peter Anvinea6e34d2002-04-30 20:51:32 +00001275 return 1;
1276}