VirtualBox

source: vbox/trunk/src/VBox/Disassembler/DisasmReg.cpp@ 49950

Last change on this file since 49950 was 42186, checked in by vboxsync, 12 years ago

SELM,DIS,CPUM,EM: Hidden selector register cleanups.
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File size: 28.6 KB
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1/* $Id: DisasmReg.cpp 42186 2012-07-17 13:32:15Z vboxsync $ */
2/** @file
3 * VBox disassembler- Register Info Helpers.
4 */
5
6/*
7 * Copyright (C) 2006-2012 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18
19/*******************************************************************************
20* Header Files *
21*******************************************************************************/
22#define LOG_GROUP LOG_GROUP_DIS
23#include <VBox/dis.h>
24#include <VBox/disopcode.h>
25#include <VBox/err.h>
26#include <VBox/log.h>
27#include <VBox/vmm/cpum.h>
28#include <iprt/assert.h>
29#include <iprt/string.h>
30#include <iprt/stdarg.h>
31#include "DisasmInternal.h"
32
33
34/*******************************************************************************
35* Global Variables *
36*******************************************************************************/
37
38/**
39 * Array for accessing 64-bit general registers in VMMREGFRAME structure
40 * by register's index from disasm.
41 */
42static const unsigned g_aReg64Index[] =
43{
44 RT_OFFSETOF(CPUMCTXCORE, rax), /* DISGREG_RAX */
45 RT_OFFSETOF(CPUMCTXCORE, rcx), /* DISGREG_RCX */
46 RT_OFFSETOF(CPUMCTXCORE, rdx), /* DISGREG_RDX */
47 RT_OFFSETOF(CPUMCTXCORE, rbx), /* DISGREG_RBX */
48 RT_OFFSETOF(CPUMCTXCORE, rsp), /* DISGREG_RSP */
49 RT_OFFSETOF(CPUMCTXCORE, rbp), /* DISGREG_RBP */
50 RT_OFFSETOF(CPUMCTXCORE, rsi), /* DISGREG_RSI */
51 RT_OFFSETOF(CPUMCTXCORE, rdi), /* DISGREG_RDI */
52 RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8 */
53 RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9 */
54 RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10 */
55 RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11 */
56 RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12 */
57 RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13 */
58 RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14 */
59 RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15 */
60};
61
62/**
63 * Macro for accessing 64-bit general purpose registers in CPUMCTXCORE structure.
64 */
65#define DIS_READ_REG64(p, idx) (*(uint64_t *)((char *)(p) + g_aReg64Index[idx]))
66#define DIS_WRITE_REG64(p, idx, val) (*(uint64_t *)((char *)(p) + g_aReg64Index[idx]) = val)
67#define DIS_PTR_REG64(p, idx) ( (uint64_t *)((char *)(p) + g_aReg64Index[idx]))
68
69/**
70 * Array for accessing 32-bit general registers in VMMREGFRAME structure
71 * by register's index from disasm.
72 */
73static const unsigned g_aReg32Index[] =
74{
75 RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_EAX */
76 RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_ECX */
77 RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_EDX */
78 RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_EBX */
79 RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_ESP */
80 RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_EBP */
81 RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_ESI */
82 RT_OFFSETOF(CPUMCTXCORE, edi), /* DISGREG_EDI */
83 RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8D */
84 RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9D */
85 RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R1D */
86 RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11D */
87 RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12D */
88 RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13D */
89 RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14D */
90 RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15D */
91};
92
93/**
94 * Macro for accessing 32-bit general purpose registers in CPUMCTXCORE structure.
95 */
96#define DIS_READ_REG32(p, idx) (*(uint32_t *)((char *)(p) + g_aReg32Index[idx]))
97/* From http://www.cs.cmu.edu/~fp/courses/15213-s06/misc/asm64-handout.pdf:
98 * ``Perhaps unexpectedly, instructions that move or generate 32-bit register
99 * values also set the upper 32 bits of the register to zero. Consequently
100 * there is no need for an instruction movzlq.''
101 */
102#define DIS_WRITE_REG32(p, idx, val) (*(uint64_t *)((char *)(p) + g_aReg32Index[idx]) = (uint32_t)val)
103#define DIS_PTR_REG32(p, idx) ( (uint32_t *)((char *)(p) + g_aReg32Index[idx]))
104
105/**
106 * Array for accessing 16-bit general registers in CPUMCTXCORE structure
107 * by register's index from disasm.
108 */
109static const unsigned g_aReg16Index[] =
110{
111 RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_AX */
112 RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_CX */
113 RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_DX */
114 RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_BX */
115 RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_SP */
116 RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_BP */
117 RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_SI */
118 RT_OFFSETOF(CPUMCTXCORE, edi), /* DISGREG_DI */
119 RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8W */
120 RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9W */
121 RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10W */
122 RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11W */
123 RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12W */
124 RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13W */
125 RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14W */
126 RT_OFFSETOF(CPUMCTXCORE, r15) /* DISGREG_R15W */
127};
128
129/**
130 * Macro for accessing 16-bit general purpose registers in CPUMCTXCORE structure.
131 */
132#define DIS_READ_REG16(p, idx) (*(uint16_t *)((char *)(p) + g_aReg16Index[idx]))
133#define DIS_WRITE_REG16(p, idx, val) (*(uint16_t *)((char *)(p) + g_aReg16Index[idx]) = val)
134#define DIS_PTR_REG16(p, idx) ( (uint16_t *)((char *)(p) + g_aReg16Index[idx]))
135
136/**
137 * Array for accessing 8-bit general registers in CPUMCTXCORE structure
138 * by register's index from disasm.
139 */
140static const unsigned g_aReg8Index[] =
141{
142 RT_OFFSETOF(CPUMCTXCORE, eax), /* DISGREG_AL */
143 RT_OFFSETOF(CPUMCTXCORE, ecx), /* DISGREG_CL */
144 RT_OFFSETOF(CPUMCTXCORE, edx), /* DISGREG_DL */
145 RT_OFFSETOF(CPUMCTXCORE, ebx), /* DISGREG_BL */
146 RT_OFFSETOF_ADD(CPUMCTXCORE, eax, 1), /* DISGREG_AH */
147 RT_OFFSETOF_ADD(CPUMCTXCORE, ecx, 1), /* DISGREG_CH */
148 RT_OFFSETOF_ADD(CPUMCTXCORE, edx, 1), /* DISGREG_DH */
149 RT_OFFSETOF_ADD(CPUMCTXCORE, ebx, 1), /* DISGREG_BH */
150 RT_OFFSETOF(CPUMCTXCORE, r8), /* DISGREG_R8B */
151 RT_OFFSETOF(CPUMCTXCORE, r9), /* DISGREG_R9B */
152 RT_OFFSETOF(CPUMCTXCORE, r10), /* DISGREG_R10B*/
153 RT_OFFSETOF(CPUMCTXCORE, r11), /* DISGREG_R11B */
154 RT_OFFSETOF(CPUMCTXCORE, r12), /* DISGREG_R12B */
155 RT_OFFSETOF(CPUMCTXCORE, r13), /* DISGREG_R13B */
156 RT_OFFSETOF(CPUMCTXCORE, r14), /* DISGREG_R14B */
157 RT_OFFSETOF(CPUMCTXCORE, r15), /* DISGREG_R15B */
158 RT_OFFSETOF(CPUMCTXCORE, esp), /* DISGREG_SPL; with REX prefix only */
159 RT_OFFSETOF(CPUMCTXCORE, ebp), /* DISGREG_BPL; with REX prefix only */
160 RT_OFFSETOF(CPUMCTXCORE, esi), /* DISGREG_SIL; with REX prefix only */
161 RT_OFFSETOF(CPUMCTXCORE, edi) /* DISGREG_DIL; with REX prefix only */
162};
163
164/**
165 * Macro for accessing 8-bit general purpose registers in CPUMCTXCORE structure.
166 */
167#define DIS_READ_REG8(p, idx) (*(uint8_t *)((char *)(p) + g_aReg8Index[idx]))
168#define DIS_WRITE_REG8(p, idx, val) (*(uint8_t *)((char *)(p) + g_aReg8Index[idx]) = val)
169#define DIS_PTR_REG8(p, idx) ( (uint8_t *)((char *)(p) + g_aReg8Index[idx]))
170
171/**
172 * Array for accessing segment registers in CPUMCTXCORE structure
173 * by register's index from disasm.
174 */
175static const unsigned g_aRegSegIndex[] =
176{
177 RT_OFFSETOF(CPUMCTXCORE, es), /* DISSELREG_ES */
178 RT_OFFSETOF(CPUMCTXCORE, cs), /* DISSELREG_CS */
179 RT_OFFSETOF(CPUMCTXCORE, ss), /* DISSELREG_SS */
180 RT_OFFSETOF(CPUMCTXCORE, ds), /* DISSELREG_DS */
181 RT_OFFSETOF(CPUMCTXCORE, fs), /* DISSELREG_FS */
182 RT_OFFSETOF(CPUMCTXCORE, gs) /* DISSELREG_GS */
183};
184
185static const unsigned g_aRegHidSegIndex[] =
186{
187 RT_OFFSETOF(CPUMCTXCORE, es), /* DISSELREG_ES */
188 RT_OFFSETOF(CPUMCTXCORE, cs), /* DISSELREG_CS */
189 RT_OFFSETOF(CPUMCTXCORE, ss), /* DISSELREG_SS */
190 RT_OFFSETOF(CPUMCTXCORE, ds), /* DISSELREG_DS */
191 RT_OFFSETOF(CPUMCTXCORE, fs), /* DISSELREG_FS */
192 RT_OFFSETOF(CPUMCTXCORE, gs) /* DISSELREG_GS */
193};
194
195/**
196 * Macro for accessing segment registers in CPUMCTXCORE structure.
197 */
198#define DIS_READ_REGSEG(p, idx) (*((uint16_t *)((char *)(p) + g_aRegSegIndex[idx])))
199#define DIS_WRITE_REGSEG(p, idx, val) (*((uint16_t *)((char *)(p) + g_aRegSegIndex[idx])) = val)
200
201//*****************************************************************************
202//*****************************************************************************
203DISDECL(int) DISGetParamSize(PCDISSTATE pDis, PCDISOPPARAM pParam)
204{
205 unsigned subtype = OP_PARM_VSUBTYPE(pParam->fParam);
206
207 if (subtype == OP_PARM_v)
208 {
209 switch (pDis->uOpMode)
210 {
211 case DISCPUMODE_32BIT:
212 subtype = OP_PARM_d;
213 break;
214 case DISCPUMODE_64BIT:
215 subtype = OP_PARM_q;
216 break;
217 case DISCPUMODE_16BIT:
218 subtype = OP_PARM_w;
219 break;
220 default:
221 /* make gcc happy */
222 break;
223 }
224 }
225
226 switch (subtype)
227 {
228 case OP_PARM_b:
229 return 1;
230
231 case OP_PARM_w:
232 return 2;
233
234 case OP_PARM_d:
235 return 4;
236
237 case OP_PARM_q:
238 case OP_PARM_dq:
239 return 8;
240
241 case OP_PARM_p: /* far pointer */
242 if (pDis->uAddrMode == DISCPUMODE_32BIT)
243 return 6; /* 16:32 */
244 else
245 if (pDis->uAddrMode == DISCPUMODE_64BIT)
246 return 12; /* 16:64 */
247 else
248 return 4; /* 16:16 */
249
250 default:
251 if (pParam->cb)
252 return pParam->cb;
253 else //@todo dangerous!!!
254 return 4;
255 }
256}
257//*****************************************************************************
258//*****************************************************************************
259DISDECL(DISSELREG) DISDetectSegReg(PCDISSTATE pDis, PCDISOPPARAM pParam)
260{
261 if (pDis->fPrefix & DISPREFIX_SEG)
262 /* Use specified SEG: prefix. */
263 return (DISSELREG)pDis->idxSegPrefix;
264
265 /* Guess segment register by parameter type. */
266 if (pParam->fUse & (DISUSE_REG_GEN32|DISUSE_REG_GEN64|DISUSE_REG_GEN16))
267 {
268 AssertCompile(DISGREG_ESP == DISGREG_RSP);
269 AssertCompile(DISGREG_EBP == DISGREG_RBP);
270 AssertCompile(DISGREG_ESP == DISGREG_SP);
271 AssertCompile(DISGREG_EBP == DISGREG_BP);
272 if (pParam->Base.idxGenReg == DISGREG_ESP || pParam->Base.idxGenReg == DISGREG_EBP)
273 return DISSELREG_SS;
274 }
275 /* Default is use DS: for data access. */
276 return DISSELREG_DS;
277}
278//*****************************************************************************
279//*****************************************************************************
280DISDECL(uint8_t) DISQuerySegPrefixByte(PCDISSTATE pDis)
281{
282 Assert(pDis->fPrefix & DISPREFIX_SEG);
283 switch (pDis->idxSegPrefix)
284 {
285 case DISSELREG_ES:
286 return 0x26;
287 case DISSELREG_CS:
288 return 0x2E;
289 case DISSELREG_SS:
290 return 0x36;
291 case DISSELREG_DS:
292 return 0x3E;
293 case DISSELREG_FS:
294 return 0x64;
295 case DISSELREG_GS:
296 return 0x65;
297 default:
298 AssertFailed();
299 return 0;
300 }
301}
302
303
304/**
305 * Returns the value of the specified 8 bits general purpose register
306 *
307 */
308DISDECL(int) DISFetchReg8(PCCPUMCTXCORE pCtx, unsigned reg8, uint8_t *pVal)
309{
310 AssertReturn(reg8 < RT_ELEMENTS(g_aReg8Index), VERR_INVALID_PARAMETER);
311
312 *pVal = DIS_READ_REG8(pCtx, reg8);
313 return VINF_SUCCESS;
314}
315
316/**
317 * Returns the value of the specified 16 bits general purpose register
318 *
319 */
320DISDECL(int) DISFetchReg16(PCCPUMCTXCORE pCtx, unsigned reg16, uint16_t *pVal)
321{
322 AssertReturn(reg16 < RT_ELEMENTS(g_aReg16Index), VERR_INVALID_PARAMETER);
323
324 *pVal = DIS_READ_REG16(pCtx, reg16);
325 return VINF_SUCCESS;
326}
327
328/**
329 * Returns the value of the specified 32 bits general purpose register
330 *
331 */
332DISDECL(int) DISFetchReg32(PCCPUMCTXCORE pCtx, unsigned reg32, uint32_t *pVal)
333{
334 AssertReturn(reg32 < RT_ELEMENTS(g_aReg32Index), VERR_INVALID_PARAMETER);
335
336 *pVal = DIS_READ_REG32(pCtx, reg32);
337 return VINF_SUCCESS;
338}
339
340/**
341 * Returns the value of the specified 64 bits general purpose register
342 *
343 */
344DISDECL(int) DISFetchReg64(PCCPUMCTXCORE pCtx, unsigned reg64, uint64_t *pVal)
345{
346 AssertReturn(reg64 < RT_ELEMENTS(g_aReg64Index), VERR_INVALID_PARAMETER);
347
348 *pVal = DIS_READ_REG64(pCtx, reg64);
349 return VINF_SUCCESS;
350}
351
352/**
353 * Returns the pointer to the specified 8 bits general purpose register
354 *
355 */
356DISDECL(int) DISPtrReg8(PCPUMCTXCORE pCtx, unsigned reg8, uint8_t **ppReg)
357{
358 AssertReturn(reg8 < RT_ELEMENTS(g_aReg8Index), VERR_INVALID_PARAMETER);
359
360 *ppReg = DIS_PTR_REG8(pCtx, reg8);
361 return VINF_SUCCESS;
362}
363
364/**
365 * Returns the pointer to the specified 16 bits general purpose register
366 *
367 */
368DISDECL(int) DISPtrReg16(PCPUMCTXCORE pCtx, unsigned reg16, uint16_t **ppReg)
369{
370 AssertReturn(reg16 < RT_ELEMENTS(g_aReg16Index), VERR_INVALID_PARAMETER);
371
372 *ppReg = DIS_PTR_REG16(pCtx, reg16);
373 return VINF_SUCCESS;
374}
375
376/**
377 * Returns the pointer to the specified 32 bits general purpose register
378 *
379 */
380DISDECL(int) DISPtrReg32(PCPUMCTXCORE pCtx, unsigned reg32, uint32_t **ppReg)
381{
382 AssertReturn(reg32 < RT_ELEMENTS(g_aReg32Index), VERR_INVALID_PARAMETER);
383
384 *ppReg = DIS_PTR_REG32(pCtx, reg32);
385 return VINF_SUCCESS;
386}
387
388/**
389 * Returns the pointer to the specified 64 bits general purpose register
390 *
391 */
392DISDECL(int) DISPtrReg64(PCPUMCTXCORE pCtx, unsigned reg64, uint64_t **ppReg)
393{
394 AssertReturn(reg64 < RT_ELEMENTS(g_aReg64Index), VERR_INVALID_PARAMETER);
395
396 *ppReg = DIS_PTR_REG64(pCtx, reg64);
397 return VINF_SUCCESS;
398}
399
400/**
401 * Returns the value of the specified segment register
402 *
403 */
404DISDECL(int) DISFetchRegSeg(PCCPUMCTXCORE pCtx, DISSELREG sel, RTSEL *pVal)
405{
406 AssertReturn((unsigned)sel < RT_ELEMENTS(g_aRegSegIndex), VERR_INVALID_PARAMETER);
407
408 AssertCompile(sizeof(uint16_t) == sizeof(RTSEL));
409 *pVal = DIS_READ_REGSEG(pCtx, sel);
410 return VINF_SUCCESS;
411}
412
413/**
414 * Returns the value of the specified segment register including a pointer to the hidden register in the supplied cpu context
415 *
416 */
417DISDECL(int) DISFetchRegSegEx(PCPUMCTXCORE pCtx, DISSELREG sel, PCPUMSELREG *ppSelReg)
418{
419 AssertReturnStmt((unsigned)sel < RT_ELEMENTS(g_aRegSegIndex), *ppSelReg = NULL, VERR_INVALID_PARAMETER);
420 *ppSelReg = (CPUMSELREG *)((uintptr_t)pCtx + g_aRegHidSegIndex[sel]);
421 return VINF_SUCCESS;
422}
423
424/**
425 * Updates the value of the specified 64 bits general purpose register
426 *
427 */
428DISDECL(int) DISWriteReg64(PCPUMCTXCORE pRegFrame, unsigned reg64, uint64_t val64)
429{
430 AssertReturn(reg64 < RT_ELEMENTS(g_aReg64Index), VERR_INVALID_PARAMETER);
431
432 DIS_WRITE_REG64(pRegFrame, reg64, val64);
433 return VINF_SUCCESS;
434}
435
436/**
437 * Updates the value of the specified 32 bits general purpose register
438 *
439 */
440DISDECL(int) DISWriteReg32(PCPUMCTXCORE pRegFrame, unsigned reg32, uint32_t val32)
441{
442 AssertReturn(reg32 < RT_ELEMENTS(g_aReg32Index), VERR_INVALID_PARAMETER);
443
444 DIS_WRITE_REG32(pRegFrame, reg32, val32);
445 return VINF_SUCCESS;
446}
447
448/**
449 * Updates the value of the specified 16 bits general purpose register
450 *
451 */
452DISDECL(int) DISWriteReg16(PCPUMCTXCORE pRegFrame, unsigned reg16, uint16_t val16)
453{
454 AssertReturn(reg16 < RT_ELEMENTS(g_aReg16Index), VERR_INVALID_PARAMETER);
455
456 DIS_WRITE_REG16(pRegFrame, reg16, val16);
457 return VINF_SUCCESS;
458}
459
460/**
461 * Updates the specified 8 bits general purpose register
462 *
463 */
464DISDECL(int) DISWriteReg8(PCPUMCTXCORE pRegFrame, unsigned reg8, uint8_t val8)
465{
466 AssertReturn(reg8 < RT_ELEMENTS(g_aReg8Index), VERR_INVALID_PARAMETER);
467
468 DIS_WRITE_REG8(pRegFrame, reg8, val8);
469 return VINF_SUCCESS;
470}
471
472/**
473 * Updates the specified segment register
474 *
475 */
476DISDECL(int) DISWriteRegSeg(PCPUMCTXCORE pCtx, DISSELREG sel, RTSEL val)
477{
478 AssertReturn((unsigned)sel < RT_ELEMENTS(g_aRegSegIndex), VERR_INVALID_PARAMETER);
479
480 AssertCompile(sizeof(uint16_t) == sizeof(RTSEL));
481 DIS_WRITE_REGSEG(pCtx, sel, val);
482 return VINF_SUCCESS;
483}
484
485/**
486 * Returns the value of the parameter in pParam
487 *
488 * @returns VBox error code
489 * @param pCtx CPU context structure pointer
490 * @param pDis Pointer to the disassembler state.
491 * @param pParam Pointer to the parameter to parse
492 * @param pParamVal Pointer to parameter value (OUT)
493 * @param parmtype Parameter type
494 *
495 * @note Currently doesn't handle FPU/XMM/MMX/3DNow! parameters correctly!!
496 *
497 */
498DISDECL(int) DISQueryParamVal(PCPUMCTXCORE pCtx, PCDISSTATE pDis, PCDISOPPARAM pParam, PDISQPVPARAMVAL pParamVal, DISQPVWHICH parmtype)
499{
500 memset(pParamVal, 0, sizeof(*pParamVal));
501
502 if (DISUSE_IS_EFFECTIVE_ADDR(pParam->fUse))
503 {
504 // Effective address
505 pParamVal->type = DISQPV_TYPE_ADDRESS;
506 pParamVal->size = pParam->cb;
507
508 if (pParam->fUse & DISUSE_BASE)
509 {
510 if (pParam->fUse & DISUSE_REG_GEN8)
511 {
512 pParamVal->flags |= DISQPV_FLAG_8;
513 if (RT_FAILURE(DISFetchReg8(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val8))) return VERR_INVALID_PARAMETER;
514 }
515 else
516 if (pParam->fUse & DISUSE_REG_GEN16)
517 {
518 pParamVal->flags |= DISQPV_FLAG_16;
519 if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val16))) return VERR_INVALID_PARAMETER;
520 }
521 else
522 if (pParam->fUse & DISUSE_REG_GEN32)
523 {
524 pParamVal->flags |= DISQPV_FLAG_32;
525 if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val32))) return VERR_INVALID_PARAMETER;
526 }
527 else
528 if (pParam->fUse & DISUSE_REG_GEN64)
529 {
530 pParamVal->flags |= DISQPV_FLAG_64;
531 if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val64))) return VERR_INVALID_PARAMETER;
532 }
533 else
534 {
535 AssertFailed();
536 return VERR_INVALID_PARAMETER;
537 }
538 }
539 // Note that scale implies index (SIB byte)
540 if (pParam->fUse & DISUSE_INDEX)
541 {
542 if (pParam->fUse & DISUSE_REG_GEN16)
543 {
544 uint16_t val16;
545
546 pParamVal->flags |= DISQPV_FLAG_16;
547 if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Index.idxGenReg, &val16))) return VERR_INVALID_PARAMETER;
548
549 Assert(!(pParam->fUse & DISUSE_SCALE)); /* shouldn't be possible in 16 bits mode */
550
551 pParamVal->val.val16 += val16;
552 }
553 else
554 if (pParam->fUse & DISUSE_REG_GEN32)
555 {
556 uint32_t val32;
557
558 pParamVal->flags |= DISQPV_FLAG_32;
559 if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Index.idxGenReg, &val32))) return VERR_INVALID_PARAMETER;
560
561 if (pParam->fUse & DISUSE_SCALE)
562 val32 *= pParam->uScale;
563
564 pParamVal->val.val32 += val32;
565 }
566 else
567 if (pParam->fUse & DISUSE_REG_GEN64)
568 {
569 uint64_t val64;
570
571 pParamVal->flags |= DISQPV_FLAG_64;
572 if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Index.idxGenReg, &val64))) return VERR_INVALID_PARAMETER;
573
574 if (pParam->fUse & DISUSE_SCALE)
575 val64 *= pParam->uScale;
576
577 pParamVal->val.val64 += val64;
578 }
579 else
580 AssertFailed();
581 }
582
583 if (pParam->fUse & DISUSE_DISPLACEMENT8)
584 {
585 if (pDis->uCpuMode == DISCPUMODE_32BIT)
586 pParamVal->val.val32 += (int32_t)pParam->uDisp.i8;
587 else
588 if (pDis->uCpuMode == DISCPUMODE_64BIT)
589 pParamVal->val.val64 += (int64_t)pParam->uDisp.i8;
590 else
591 pParamVal->val.val16 += (int16_t)pParam->uDisp.i8;
592 }
593 else
594 if (pParam->fUse & DISUSE_DISPLACEMENT16)
595 {
596 if (pDis->uCpuMode == DISCPUMODE_32BIT)
597 pParamVal->val.val32 += (int32_t)pParam->uDisp.i16;
598 else
599 if (pDis->uCpuMode == DISCPUMODE_64BIT)
600 pParamVal->val.val64 += (int64_t)pParam->uDisp.i16;
601 else
602 pParamVal->val.val16 += pParam->uDisp.i16;
603 }
604 else
605 if (pParam->fUse & DISUSE_DISPLACEMENT32)
606 {
607 if (pDis->uCpuMode == DISCPUMODE_32BIT)
608 pParamVal->val.val32 += pParam->uDisp.i32;
609 else
610 pParamVal->val.val64 += pParam->uDisp.i32;
611 }
612 else
613 if (pParam->fUse & DISUSE_DISPLACEMENT64)
614 {
615 Assert(pDis->uCpuMode == DISCPUMODE_64BIT);
616 pParamVal->val.val64 += pParam->uDisp.i64;
617 }
618 else
619 if (pParam->fUse & DISUSE_RIPDISPLACEMENT32)
620 {
621 Assert(pDis->uCpuMode == DISCPUMODE_64BIT);
622 /* Relative to the RIP of the next instruction. */
623 pParamVal->val.val64 += pParam->uDisp.i32 + pCtx->rip + pDis->cbInstr;
624 }
625 return VINF_SUCCESS;
626 }
627
628 if (pParam->fUse & (DISUSE_REG_GEN8|DISUSE_REG_GEN16|DISUSE_REG_GEN32|DISUSE_REG_GEN64|DISUSE_REG_FP|DISUSE_REG_MMX|DISUSE_REG_XMM|DISUSE_REG_CR|DISUSE_REG_DBG|DISUSE_REG_SEG|DISUSE_REG_TEST))
629 {
630 if (parmtype == DISQPVWHICH_DST)
631 {
632 // Caller needs to interpret the register according to the instruction (source/target, special value etc)
633 pParamVal->type = DISQPV_TYPE_REGISTER;
634 pParamVal->size = pParam->cb;
635 return VINF_SUCCESS;
636 }
637 //else DISQPVWHICH_SRC
638
639 pParamVal->type = DISQPV_TYPE_IMMEDIATE;
640
641 if (pParam->fUse & DISUSE_REG_GEN8)
642 {
643 pParamVal->flags |= DISQPV_FLAG_8;
644 pParamVal->size = sizeof(uint8_t);
645 if (RT_FAILURE(DISFetchReg8(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val8))) return VERR_INVALID_PARAMETER;
646 }
647 else
648 if (pParam->fUse & DISUSE_REG_GEN16)
649 {
650 pParamVal->flags |= DISQPV_FLAG_16;
651 pParamVal->size = sizeof(uint16_t);
652 if (RT_FAILURE(DISFetchReg16(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val16))) return VERR_INVALID_PARAMETER;
653 }
654 else
655 if (pParam->fUse & DISUSE_REG_GEN32)
656 {
657 pParamVal->flags |= DISQPV_FLAG_32;
658 pParamVal->size = sizeof(uint32_t);
659 if (RT_FAILURE(DISFetchReg32(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val32))) return VERR_INVALID_PARAMETER;
660 }
661 else
662 if (pParam->fUse & DISUSE_REG_GEN64)
663 {
664 pParamVal->flags |= DISQPV_FLAG_64;
665 pParamVal->size = sizeof(uint64_t);
666 if (RT_FAILURE(DISFetchReg64(pCtx, pParam->Base.idxGenReg, &pParamVal->val.val64))) return VERR_INVALID_PARAMETER;
667 }
668 else
669 {
670 // Caller needs to interpret the register according to the instruction (source/target, special value etc)
671 pParamVal->type = DISQPV_TYPE_REGISTER;
672 }
673 Assert(!(pParam->fUse & DISUSE_IMMEDIATE));
674 return VINF_SUCCESS;
675 }
676
677 if (pParam->fUse & DISUSE_IMMEDIATE)
678 {
679 pParamVal->type = DISQPV_TYPE_IMMEDIATE;
680 if (pParam->fUse & (DISUSE_IMMEDIATE8|DISUSE_IMMEDIATE8_REL))
681 {
682 pParamVal->flags |= DISQPV_FLAG_8;
683 if (pParam->cb == 2)
684 {
685 pParamVal->size = sizeof(uint16_t);
686 pParamVal->val.val16 = (uint8_t)pParam->uValue;
687 }
688 else
689 {
690 pParamVal->size = sizeof(uint8_t);
691 pParamVal->val.val8 = (uint8_t)pParam->uValue;
692 }
693 }
694 else
695 if (pParam->fUse & (DISUSE_IMMEDIATE16|DISUSE_IMMEDIATE16_REL|DISUSE_IMMEDIATE_ADDR_0_16|DISUSE_IMMEDIATE16_SX8))
696 {
697 pParamVal->flags |= DISQPV_FLAG_16;
698 pParamVal->size = sizeof(uint16_t);
699 pParamVal->val.val16 = (uint16_t)pParam->uValue;
700 AssertMsg(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE16_SX8)), ("pParamVal->size %d vs %d EIP=%RX32\n", pParamVal->size, pParam->cb, pCtx->eip) );
701 }
702 else
703 if (pParam->fUse & (DISUSE_IMMEDIATE32|DISUSE_IMMEDIATE32_REL|DISUSE_IMMEDIATE_ADDR_0_32|DISUSE_IMMEDIATE32_SX8))
704 {
705 pParamVal->flags |= DISQPV_FLAG_32;
706 pParamVal->size = sizeof(uint32_t);
707 pParamVal->val.val32 = (uint32_t)pParam->uValue;
708 Assert(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE32_SX8)) );
709 }
710 else
711 if (pParam->fUse & (DISUSE_IMMEDIATE64 | DISUSE_IMMEDIATE64_REL | DISUSE_IMMEDIATE64_SX8))
712 {
713 pParamVal->flags |= DISQPV_FLAG_64;
714 pParamVal->size = sizeof(uint64_t);
715 pParamVal->val.val64 = pParam->uValue;
716 Assert(pParamVal->size == pParam->cb || ((pParam->cb == 1) && (pParam->fUse & DISUSE_IMMEDIATE64_SX8)) );
717 }
718 else
719 if (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16))
720 {
721 pParamVal->flags |= DISQPV_FLAG_FARPTR16;
722 pParamVal->size = sizeof(uint16_t)*2;
723 pParamVal->val.farptr.sel = (uint16_t)RT_LOWORD(pParam->uValue >> 16);
724 pParamVal->val.farptr.offset = (uint32_t)RT_LOWORD(pParam->uValue);
725 Assert(pParamVal->size == pParam->cb);
726 }
727 else
728 if (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_32))
729 {
730 pParamVal->flags |= DISQPV_FLAG_FARPTR32;
731 pParamVal->size = sizeof(uint16_t) + sizeof(uint32_t);
732 pParamVal->val.farptr.sel = (uint16_t)RT_LOWORD(pParam->uValue >> 32);
733 pParamVal->val.farptr.offset = (uint32_t)(pParam->uValue & 0xFFFFFFFF);
734 Assert(pParam->cb == 8);
735 }
736 }
737 return VINF_SUCCESS;
738}
739
740/**
741 * Returns the pointer to a register of the parameter in pParam. We need this
742 * pointer when an interpreted instruction updates a register as a side effect.
743 * In CMPXCHG we know that only [r/e]ax is updated, but with XADD this could
744 * be every register.
745 *
746 * @returns VBox error code
747 * @param pCtx CPU context structure pointer
748 * @param pDis Pointer to the disassembler state.
749 * @param pParam Pointer to the parameter to parse
750 * @param pReg Pointer to parameter value (OUT)
751 * @param cbsize Parameter size (OUT)
752 *
753 * @note Currently doesn't handle FPU/XMM/MMX/3DNow! parameters correctly!!
754 *
755 */
756DISDECL(int) DISQueryParamRegPtr(PCPUMCTXCORE pCtx, PCDISSTATE pDis, PCDISOPPARAM pParam, void **ppReg, size_t *pcbSize)
757{
758 NOREF(pDis);
759 if (pParam->fUse & (DISUSE_REG_GEN8|DISUSE_REG_GEN16|DISUSE_REG_GEN32|DISUSE_REG_FP|DISUSE_REG_MMX|DISUSE_REG_XMM|DISUSE_REG_CR|DISUSE_REG_DBG|DISUSE_REG_SEG|DISUSE_REG_TEST))
760 {
761 if (pParam->fUse & DISUSE_REG_GEN8)
762 {
763 uint8_t *pu8Reg;
764 if (RT_SUCCESS(DISPtrReg8(pCtx, pParam->Base.idxGenReg, &pu8Reg)))
765 {
766 *pcbSize = sizeof(uint8_t);
767 *ppReg = (void *)pu8Reg;
768 return VINF_SUCCESS;
769 }
770 }
771 else
772 if (pParam->fUse & DISUSE_REG_GEN16)
773 {
774 uint16_t *pu16Reg;
775 if (RT_SUCCESS(DISPtrReg16(pCtx, pParam->Base.idxGenReg, &pu16Reg)))
776 {
777 *pcbSize = sizeof(uint16_t);
778 *ppReg = (void *)pu16Reg;
779 return VINF_SUCCESS;
780 }
781 }
782 else
783 if (pParam->fUse & DISUSE_REG_GEN32)
784 {
785 uint32_t *pu32Reg;
786 if (RT_SUCCESS(DISPtrReg32(pCtx, pParam->Base.idxGenReg, &pu32Reg)))
787 {
788 *pcbSize = sizeof(uint32_t);
789 *ppReg = (void *)pu32Reg;
790 return VINF_SUCCESS;
791 }
792 }
793 else
794 if (pParam->fUse & DISUSE_REG_GEN64)
795 {
796 uint64_t *pu64Reg;
797 if (RT_SUCCESS(DISPtrReg64(pCtx, pParam->Base.idxGenReg, &pu64Reg)))
798 {
799 *pcbSize = sizeof(uint64_t);
800 *ppReg = (void *)pu64Reg;
801 return VINF_SUCCESS;
802 }
803 }
804 }
805 return VERR_INVALID_PARAMETER;
806}
807
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