DisasmFormatYasm.cpp@ 53426

Last change on this file since 53426 was 53172, checked in by vboxsync, 10 years ago
DIS: #6249: Complex instructions support (like gather) and some fixes. VSIB fix.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 67.2 KB

Line
1	/* $Id: DisasmFormatYasm.cpp 53172 2014-10-31 17:44:19Z vboxsync $ */
2	/** @file
3	* VBox Disassembler - Yasm(/Nasm) Style Formatter.
4	*/
5
6	/*
7	* Copyright (C) 2008-2012 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	#include <VBox/dis.h>
23	#include "DisasmInternal.h"
24	#include <iprt/string.h>
25	#include <iprt/assert.h>
26	#include <iprt/ctype.h>
27
28
29	/*******************************************************************************
30	* Global Variables *
31	*******************************************************************************/
32	static const char g_szSpaces[] =
33	" ";
34	static const char g_aszYasmRegGen8[20][5] =
35	{
36	"al\0\0", "cl\0\0", "dl\0\0", "bl\0\0", "ah\0\0", "ch\0\0", "dh\0\0", "bh\0\0", "r8b\0", "r9b\0", "r10b", "r11b", "r12b", "r13b", "r14b", "r15b", "spl\0", "bpl\0", "sil\0", "dil\0"
37	};
38	static const char g_aszYasmRegGen16[16][5] =
39	{
40	"ax\0\0", "cx\0\0", "dx\0\0", "bx\0\0", "sp\0\0", "bp\0\0", "si\0\0", "di\0\0", "r8w\0", "r9w\0", "r10w", "r11w", "r12w", "r13w", "r14w", "r15w"
41	};
42	static const char g_aszYasmRegGen1616[8][6] =
43	{
44	"bx+si", "bx+di", "bp+si", "bp+di", "si\0\0\0", "di\0\0\0", "bp\0\0\0", "bx\0\0\0"
45	};
46	static const char g_aszYasmRegGen32[16][5] =
47	{
48	"eax\0", "ecx\0", "edx\0", "ebx\0", "esp\0", "ebp\0", "esi\0", "edi\0", "r8d\0", "r9d\0", "r10d", "r11d", "r12d", "r13d", "r14d", "r15d"
49	};
50	static const char g_aszYasmRegGen64[16][4] =
51	{
52	"rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi", "r8\0", "r9\0", "r10", "r11", "r12", "r13", "r14", "r15"
53	};
54	static const char g_aszYasmRegSeg[6][3] =
55	{
56	"es", "cs", "ss", "ds", "fs", "gs"
57	};
58	static const char g_aszYasmRegFP[8][4] =
59	{
60	"st0", "st1", "st2", "st3", "st4", "st5", "st6", "st7"
61	};
62	static const char g_aszYasmRegMMX[8][4] =
63	{
64	"mm0", "mm1", "mm2", "mm3", "mm4", "mm5", "mm6", "mm7"
65	};
66	static const char g_aszYasmRegXMM[16][6] =
67	{
68	"xmm0\0", "xmm1\0", "xmm2\0", "xmm3\0", "xmm4\0", "xmm5\0", "xmm6\0", "xmm7\0", "xmm8\0", "xmm9\0", "xmm10", "xmm11", "xmm12", "xmm13", "xmm14", "xmm15"
69	};
70	static const char g_aszYasmRegYMM[16][6] =
71	{
72	"ymm0\0", "ymm1\0", "ymm2\0", "ymm3\0", "ymm4\0", "ymm5\0", "ymm6\0", "ymm7\0", "ymm8\0", "ymm9\0", "ymm10", "ymm11", "ymm12", "ymm13", "ymm14", "ymm15"
73	};
74	static const char g_aszYasmRegCRx[16][5] =
75	{
76	"cr0\0", "cr1\0", "cr2\0", "cr3\0", "cr4\0", "cr5\0", "cr6\0", "cr7\0", "cr8\0", "cr9\0", "cr10", "cr11", "cr12", "cr13", "cr14", "cr15"
77	};
78	static const char g_aszYasmRegDRx[16][5] =
79	{
80	"dr0\0", "dr1\0", "dr2\0", "dr3\0", "dr4\0", "dr5\0", "dr6\0", "dr7\0", "dr8\0", "dr9\0", "dr10", "dr11", "dr12", "dr13", "dr14", "dr15"
81	};
82	static const char g_aszYasmRegTRx[16][5] =
83	{
84	"tr0\0", "tr1\0", "tr2\0", "tr3\0", "tr4\0", "tr5\0", "tr6\0", "tr7\0", "tr8\0", "tr9\0", "tr10", "tr11", "tr12", "tr13", "tr14", "tr15"
85	};
86
87
88
89	/**
90	* Gets the base register name for the given parameter.
91	*
92	* @returns Pointer to the register name.
93	* @param pDis The disassembler state.
94	* @param pParam The parameter.
95	* @param pcchReg Where to store the length of the name.
96	*/
97	static const char disasmFormatYasmBaseReg(PCDISSTATE pDis, PCDISOPPARAM pParam, size_t pcchReg)
98	{
99	switch (pParam->fUse & ( DISUSE_REG_GEN8 \| DISUSE_REG_GEN16 \| DISUSE_REG_GEN32 \| DISUSE_REG_GEN64
100	\| DISUSE_REG_FP \| DISUSE_REG_MMX \| DISUSE_REG_XMM \| DISUSE_REG_YMM
101	\| DISUSE_REG_CR \| DISUSE_REG_DBG \| DISUSE_REG_SEG \| DISUSE_REG_TEST))
102
103	{
104	case DISUSE_REG_GEN8:
105	{
106	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen8));
107	const char *psz = g_aszYasmRegGen8[pParam->Base.idxGenReg];
108	*pcchReg = 2 + !!psz[2] + !!psz[3];
109	return psz;
110	}
111
112	case DISUSE_REG_GEN16:
113	{
114	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen16));
115	const char *psz = g_aszYasmRegGen16[pParam->Base.idxGenReg];
116	*pcchReg = 2 + !!psz[2] + !!psz[3];
117	return psz;
118	}
119
120	// VSIB
121	case DISUSE_REG_XMM \| DISUSE_REG_GEN32:
122	case DISUSE_REG_YMM \| DISUSE_REG_GEN32:
123	case DISUSE_REG_GEN32:
124	{
125	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen32));
126	const char *psz = g_aszYasmRegGen32[pParam->Base.idxGenReg];
127	*pcchReg = 2 + !!psz[2] + !!psz[3];
128	return psz;
129	}
130
131	// VSIB
132	case DISUSE_REG_XMM \| DISUSE_REG_GEN64:
133	case DISUSE_REG_YMM \| DISUSE_REG_GEN64:
134	case DISUSE_REG_GEN64:
135	{
136	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen64));
137	const char *psz = g_aszYasmRegGen64[pParam->Base.idxGenReg];
138	*pcchReg = 2 + !!psz[2] + !!psz[3];
139	return psz;
140	}
141
142	case DISUSE_REG_FP:
143	{
144	Assert(pParam->Base.idxFpuReg < RT_ELEMENTS(g_aszYasmRegFP));
145	const char *psz = g_aszYasmRegFP[pParam->Base.idxFpuReg];
146	*pcchReg = 3;
147	return psz;
148	}
149
150	case DISUSE_REG_MMX:
151	{
152	Assert(pParam->Base.idxMmxReg < RT_ELEMENTS(g_aszYasmRegMMX));
153	const char *psz = g_aszYasmRegMMX[pParam->Base.idxMmxReg];
154	*pcchReg = 3;
155	return psz;
156	}
157
158	case DISUSE_REG_XMM:
159	{
160	Assert(pParam->Base.idxXmmReg < RT_ELEMENTS(g_aszYasmRegXMM));
161	const char *psz = g_aszYasmRegXMM[pParam->Base.idxXmmReg];
162	*pcchReg = 4 + !!psz[4];
163	return psz;
164	}
165
166	case DISUSE_REG_YMM:
167	{
168	Assert(pParam->Base.idxYmmReg < RT_ELEMENTS(g_aszYasmRegYMM));
169	const char *psz = g_aszYasmRegYMM[pParam->Base.idxYmmReg];
170	*pcchReg = 4 + !!psz[4];
171	return psz;
172	}
173
174	case DISUSE_REG_CR:
175	{
176	Assert(pParam->Base.idxCtrlReg < RT_ELEMENTS(g_aszYasmRegCRx));
177	const char *psz = g_aszYasmRegCRx[pParam->Base.idxCtrlReg];
178	*pcchReg = 3;
179	return psz;
180	}
181
182	case DISUSE_REG_DBG:
183	{
184	Assert(pParam->Base.idxDbgReg < RT_ELEMENTS(g_aszYasmRegDRx));
185	const char *psz = g_aszYasmRegDRx[pParam->Base.idxDbgReg];
186	*pcchReg = 3;
187	return psz;
188	}
189
190	case DISUSE_REG_SEG:
191	{
192	Assert(pParam->Base.idxSegReg < RT_ELEMENTS(g_aszYasmRegCRx));
193	const char *psz = g_aszYasmRegSeg[pParam->Base.idxSegReg];
194	*pcchReg = 2;
195	return psz;
196	}
197
198	case DISUSE_REG_TEST:
199	{
200	Assert(pParam->Base.idxTestReg < RT_ELEMENTS(g_aszYasmRegTRx));
201	const char *psz = g_aszYasmRegTRx[pParam->Base.idxTestReg];
202	*pcchReg = 3;
203	return psz;
204	}
205
206	default:
207	AssertMsgFailed(("%#x\n", pParam->fUse));
208	*pcchReg = 3;
209	return "r??";
210	}
211	}
212
213
214	/**
215	* Gets the index register name for the given parameter.
216	*
217	* @returns The index register name.
218	* @param pDis The disassembler state.
219	* @param pParam The parameter.
220	* @param pcchReg Where to store the length of the name.
221	*/
222	static const char disasmFormatYasmIndexReg(PCDISSTATE pDis, PCDISOPPARAM pParam, size_t pcchReg)
223	{
224	if (pParam->fUse & DISUSE_REG_XMM)
225	{
226	Assert(pParam->Index.idxXmmReg < RT_ELEMENTS(g_aszYasmRegXMM));
227	const char *psz = g_aszYasmRegXMM[pParam->Index.idxXmmReg];
228	*pcchReg = 4 + !!psz[4];
229	return psz;
230	}
231	else if (pParam->fUse & DISUSE_REG_YMM)
232	{
233	Assert(pParam->Index.idxYmmReg < RT_ELEMENTS(g_aszYasmRegYMM));
234	const char *psz = g_aszYasmRegYMM[pParam->Index.idxYmmReg];
235	*pcchReg = 4 + !!psz[4];
236	return psz;
237
238	}
239	else
240	switch (pDis->uAddrMode)
241	{
242	case DISCPUMODE_16BIT:
243	{
244	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen16));
245	const char *psz = g_aszYasmRegGen16[pParam->Index.idxGenReg];
246	*pcchReg = 2 + !!psz[2] + !!psz[3];
247	return psz;
248	}
249
250	case DISCPUMODE_32BIT:
251	{
252	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen32));
253	const char *psz = g_aszYasmRegGen32[pParam->Index.idxGenReg];
254	*pcchReg = 2 + !!psz[2] + !!psz[3];
255	return psz;
256	}
257
258	case DISCPUMODE_64BIT:
259	{
260	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen64));
261	const char *psz = g_aszYasmRegGen64[pParam->Index.idxGenReg];
262	*pcchReg = 2 + !!psz[2] + !!psz[3];
263	return psz;
264	}
265
266	default:
267	AssertMsgFailed(("%#x %#x\n", pParam->fUse, pDis->uAddrMode));
268	*pcchReg = 3;
269	return "r??";
270	}
271	}
272
273
274	/**
275	* Formats the current instruction in Yasm (/ Nasm) style.
276	*
277	*
278	* @returns The number of output characters. If this is >= cchBuf, then the content
279	* of pszBuf will be truncated.
280	* @param pDis Pointer to the disassembler state.
281	* @param pszBuf The output buffer.
282	* @param cchBuf The size of the output buffer.
283	* @param fFlags Format flags, see DIS_FORMAT_FLAGS_*.
284	* @param pfnGetSymbol Get symbol name for a jmp or call target address. Optional.
285	* @param pvUser User argument for pfnGetSymbol.
286	*/
287	DISDECL(size_t) DISFormatYasmEx(PCDISSTATE pDis, char *pszBuf, size_t cchBuf, uint32_t fFlags,
288	PFNDISGETSYMBOL pfnGetSymbol, void *pvUser)
289	{
290	/** @todo monitor and mwait aren't formatted correctly in 64-bit mode. */
291	/*
292	* Input validation and massaging.
293	*/
294	AssertPtr(pDis);
295	AssertPtrNull(pszBuf);
296	Assert(pszBuf \|\| !cchBuf);
297	AssertPtrNull(pfnGetSymbol);
298	AssertMsg(DIS_FMT_FLAGS_IS_VALID(fFlags), ("%#x\n", fFlags));
299	if (fFlags & DIS_FMT_FLAGS_ADDR_COMMENT)
300	fFlags = (fFlags & ~DIS_FMT_FLAGS_ADDR_LEFT) \| DIS_FMT_FLAGS_ADDR_RIGHT;
301	if (fFlags & DIS_FMT_FLAGS_BYTES_COMMENT)
302	fFlags = (fFlags & ~DIS_FMT_FLAGS_BYTES_LEFT) \| DIS_FMT_FLAGS_BYTES_RIGHT;
303
304	PCDISOPCODE const pOp = pDis->pCurInstr;
305
306	/*
307	* Output macros
308	*/
309	char *pszDst = pszBuf;
310	size_t cchDst = cchBuf;
311	size_t cchOutput = 0;
312	#define PUT_C(ch) \
313	do { \
314	cchOutput++; \
315	if (cchDst > 1) \
316	{ \
317	cchDst--; \
318	*pszDst++ = (ch); \
319	} \
320	} while (0)
321	#define PUT_STR(pszSrc, cchSrc) \
322	do { \
323	cchOutput += (cchSrc); \
324	if (cchDst > (cchSrc)) \
325	{ \
326	memcpy(pszDst, (pszSrc), (cchSrc)); \
327	pszDst += (cchSrc); \
328	cchDst -= (cchSrc); \
329	} \
330	else if (cchDst > 1) \
331	{ \
332	memcpy(pszDst, (pszSrc), cchDst - 1); \
333	pszDst += cchDst - 1; \
334	cchDst = 1; \
335	} \
336	} while (0)
337	#define PUT_SZ(sz) \
338	PUT_STR((sz), sizeof(sz) - 1)
339	#define PUT_SZ_STRICT(szStrict, szRelaxed) \
340	do { if (fFlags & DIS_FMT_FLAGS_STRICT) PUT_SZ(szStrict); else PUT_SZ(szRelaxed); } while (0)
341	#define PUT_PSZ(psz) \
342	do { const size_t cchTmp = strlen(psz); PUT_STR((psz), cchTmp); } while (0)
343	#define PUT_NUM(cch, fmt, num) \
344	do { \
345	cchOutput += (cch); \
346	if (cchDst > 1) \
347	{ \
348	const size_t cchTmp = RTStrPrintf(pszDst, cchDst, fmt, (num)); \
349	pszDst += cchTmp; \
350	cchDst -= cchTmp; \
351	Assert(cchTmp == (cch) \|\| cchDst == 1); \
352	} \
353	} while (0)
354	/** @todo add two flags for choosing between %X / %x and h / 0x. */
355	#define PUT_NUM_8(num) PUT_NUM(4, "0%02xh", (uint8_t)(num))
356	#define PUT_NUM_16(num) PUT_NUM(6, "0%04xh", (uint16_t)(num))
357	#define PUT_NUM_32(num) PUT_NUM(10, "0%08xh", (uint32_t)(num))
358	#define PUT_NUM_64(num) PUT_NUM(18, "0%016RX64h", (uint64_t)(num))
359
360	#define PUT_NUM_SIGN(cch, fmt, num, stype, utype) \
361	do { \
362	if ((stype)(num) >= 0) \
363	{ \
364	PUT_C('+'); \
365	PUT_NUM(cch, fmt, (utype)(num)); \
366	} \
367	else \
368	{ \
369	PUT_C('-'); \
370	PUT_NUM(cch, fmt, (utype)-(stype)(num)); \
371	} \
372	} while (0)
373	#define PUT_NUM_S8(num) PUT_NUM_SIGN(4, "0%02xh", num, int8_t, uint8_t)
374	#define PUT_NUM_S16(num) PUT_NUM_SIGN(6, "0%04xh", num, int16_t, uint16_t)
375	#define PUT_NUM_S32(num) PUT_NUM_SIGN(10, "0%08xh", num, int32_t, uint32_t)
376	#define PUT_NUM_S64(num) PUT_NUM_SIGN(18, "0%016RX64h", num, int64_t, uint64_t)
377
378	#define PUT_SYMBOL_TWO(a_rcSym, a_szStart, a_chEnd) \
379	do { \
380	if (RT_SUCCESS(a_rcSym)) \
381	{ \
382	PUT_SZ(a_szStart); \
383	PUT_PSZ(szSymbol); \
384	if (off != 0) \
385	{ \
386	if ((int8_t)off == off) \
387	PUT_NUM_S8(off); \
388	else if ((int16_t)off == off) \
389	PUT_NUM_S16(off); \
390	else if ((int32_t)off == off) \
391	PUT_NUM_S32(off); \
392	else \
393	PUT_NUM_S64(off); \
394	} \
395	PUT_C(a_chEnd); \
396	} \
397	} while (0)
398
399	#define PUT_SYMBOL(a_uSeg, a_uAddr, a_szStart, a_chEnd) \
400	do { \
401	if (pfnGetSymbol) \
402	{ \
403	int rcSym = pfnGetSymbol(pDis, a_uSeg, a_uAddr, szSymbol, sizeof(szSymbol), &off, pvUser); \
404	PUT_SYMBOL_TWO(rcSym, a_szStart, a_chEnd); \
405	} \
406	} while (0)
407
408
409	/*
410	* The address?
411	*/
412	if (fFlags & DIS_FMT_FLAGS_ADDR_LEFT)
413	{
414	#if HC_ARCH_BITS == 64 \|\| GC_ARCH_BITS == 64
415	if (pDis->uInstrAddr >= _4G)
416	PUT_NUM(9, "%08x`", (uint32_t)(pDis->uInstrAddr >> 32));
417	#endif
418	PUT_NUM(8, "%08x", (uint32_t)pDis->uInstrAddr);
419	PUT_C(' ');
420	}
421
422	/*
423	* The opcode bytes?
424	*/
425	if (fFlags & DIS_FMT_FLAGS_BYTES_LEFT)
426	{
427	size_t cchTmp = disFormatBytes(pDis, pszDst, cchDst, fFlags);
428	cchOutput += cchTmp;
429	if (cchDst > 1)
430	{
431	if (cchTmp <= cchDst)
432	{
433	cchDst -= cchTmp;
434	pszDst += cchTmp;
435	}
436	else
437	{
438	pszDst += cchDst - 1;
439	cchDst = 1;
440	}
441	}
442
443	/* Some padding to align the instruction. */
444	size_t cchPadding = (7 * (2 + !!(fFlags & DIS_FMT_FLAGS_BYTES_SPACED)))
445	+ !!(fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS) * 2
446	+ 2;
447	cchPadding = cchTmp + 1 >= cchPadding ? 1 : cchPadding - cchTmp;
448	PUT_STR(g_szSpaces, cchPadding);
449	}
450
451
452	/*
453	* Filter out invalid opcodes first as they need special
454	* treatment. UD2 is an exception and should be handled normally.
455	*/
456	size_t const offInstruction = cchOutput;
457	if ( pOp->uOpcode == OP_INVALID
458	\|\| ( pOp->uOpcode == OP_ILLUD2
459	&& (pDis->fPrefix & DISPREFIX_LOCK)))
460	PUT_SZ("Illegal opcode");
461	else
462	{
463	/*
464	* Prefixes
465	*/
466	if (pDis->fPrefix & DISPREFIX_LOCK)
467	PUT_SZ("lock ");
468	if(pDis->fPrefix & DISPREFIX_REP)
469	PUT_SZ("rep ");
470	else if(pDis->fPrefix & DISPREFIX_REPNE)
471	PUT_SZ("repne ");
472
473	/*
474	* Adjust the format string to the correct mnemonic
475	* or to avoid things the assembler cannot handle correctly.
476	*/
477	char szTmpFmt[48];
478	const char *pszFmt = pOp->pszOpcode;
479	switch (pOp->uOpcode)
480	{
481	case OP_JECXZ:
482	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "jcxz %Jb" : pDis->uOpMode == DISCPUMODE_32BIT ? "jecxz %Jb" : "jrcxz %Jb";
483	break;
484	case OP_PUSHF:
485	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "pushfw" : pDis->uOpMode == DISCPUMODE_32BIT ? "pushfd" : "pushfq";
486	break;
487	case OP_POPF:
488	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "popfw" : pDis->uOpMode == DISCPUMODE_32BIT ? "popfd" : "popfq";
489	break;
490	case OP_PUSHA:
491	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "pushaw" : "pushad";
492	break;
493	case OP_POPA:
494	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "popaw" : "popad";
495	break;
496	case OP_INSB:
497	pszFmt = "insb";
498	break;
499	case OP_INSWD:
500	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "insw" : pDis->uOpMode == DISCPUMODE_32BIT ? "insd" : "insq";
501	break;
502	case OP_OUTSB:
503	pszFmt = "outsb";
504	break;
505	case OP_OUTSWD:
506	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "outsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "outsd" : "outsq";
507	break;
508	case OP_MOVSB:
509	pszFmt = "movsb";
510	break;
511	case OP_MOVSWD:
512	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "movsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "movsd" : "movsq";
513	break;
514	case OP_CMPSB:
515	pszFmt = "cmpsb";
516	break;
517	case OP_CMPWD:
518	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cmpsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "cmpsd" : "cmpsq";
519	break;
520	case OP_SCASB:
521	pszFmt = "scasb";
522	break;
523	case OP_SCASWD:
524	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "scasw" : pDis->uOpMode == DISCPUMODE_32BIT ? "scasd" : "scasq";
525	break;
526	case OP_LODSB:
527	pszFmt = "lodsb";
528	break;
529	case OP_LODSWD:
530	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "lodsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "lodsd" : "lodsq";
531	break;
532	case OP_STOSB:
533	pszFmt = "stosb";
534	break;
535	case OP_STOSWD:
536	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "stosw" : pDis->uOpMode == DISCPUMODE_32BIT ? "stosd" : "stosq";
537	break;
538	case OP_CBW:
539	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cbw" : pDis->uOpMode == DISCPUMODE_32BIT ? "cwde" : "cdqe";
540	break;
541	case OP_CWD:
542	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cwd" : pDis->uOpMode == DISCPUMODE_32BIT ? "cdq" : "cqo";
543	break;
544	case OP_SHL:
545	Assert(pszFmt[3] == '/');
546	pszFmt += 4;
547	break;
548	case OP_XLAT:
549	pszFmt = "xlatb";
550	break;
551	case OP_INT3:
552	pszFmt = "int3";
553	break;
554
555	/*
556	* Don't know how to tell yasm to generate complicated nop stuff, so 'db' it.
557	*/
558	case OP_NOP:
559	if (pDis->bOpCode == 0x90)
560	/* fine, fine */;
561	else if (pszFmt[sizeof("nop %Ev") - 1] == '/' && pszFmt[sizeof("nop %Ev")] == 'p')
562	pszFmt = "prefetch %Eb";
563	else if (pDis->bOpCode == 0x1f)
564	{
565	Assert(pDis->cbInstr >= 3);
566	PUT_SZ("db 00fh, 01fh,");
567	PUT_NUM_8(MAKE_MODRM(pDis->ModRM.Bits.Mod, pDis->ModRM.Bits.Reg, pDis->ModRM.Bits.Rm));
568	for (unsigned i = 3; i < pDis->cbInstr; i++)
569	{
570	PUT_C(',');
571	PUT_NUM_8(0x90); ///@todo fixme.
572	}
573	pszFmt = "";
574	}
575	break;
576
577	default:
578	/* ST(X) -> stX (floating point) */
579	if (*pszFmt == 'f' && strchr(pszFmt, '('))
580	{
581	char *pszFmtDst = szTmpFmt;
582	char ch;
583	do
584	{
585	ch = *pszFmt++;
586	if (ch == 'S' && pszFmt[0] == 'T' && pszFmt[1] == '(')
587	{
588	*pszFmtDst++ = 's';
589	*pszFmtDst++ = 't';
590	pszFmt += 2;
591	ch = *pszFmt;
592	Assert(pszFmt[1] == ')');
593	pszFmt += 2;
594	*pszFmtDst++ = ch;
595	}
596	else
597	*pszFmtDst++ = ch;
598	} while (ch != '\0');
599	pszFmt = szTmpFmt;
600	}
601	if (strchr ("#@&", *pszFmt))
602	{
603	const char *pszDelim = strchr(pszFmt, '/');
604	const char *pszSpace = (pszDelim ? strchr(pszDelim, ' ') : NULL);
605	if (pszDelim != NULL)
606	{
607	char *pszFmtDst = szTmpFmt;
608	if (pszSpace == NULL) pszSpace = strchr(pszDelim, 0);
609	if ( (*pszFmt == '#' && pDis->bVexWFlag)
610	\|\| (*pszFmt == '@' && !VEXREG_IS256B(pDis->bVexDestReg))
611	\|\| (*pszFmt == '&' && ( DISUSE_IS_EFFECTIVE_ADDR(pDis->Param1.fUse)
612	\|\| DISUSE_IS_EFFECTIVE_ADDR(pDis->Param2.fUse)
613	\|\| DISUSE_IS_EFFECTIVE_ADDR(pDis->Param3.fUse)
614	\|\| DISUSE_IS_EFFECTIVE_ADDR(pDis->Param4.fUse))))
615	{
616	strncpy(pszFmtDst, pszFmt + 1, pszDelim - pszFmt - 1);
617	pszFmtDst += pszDelim - pszFmt - 1;
618	}
619	else
620	{
621	strncpy(pszFmtDst, pszDelim + 1, pszSpace - pszDelim - 1);
622	pszFmtDst += pszSpace - pszDelim - 1;
623	}
624	strcpy (pszFmtDst, pszSpace);
625	pszFmt = szTmpFmt;
626	}
627	}
628	break;
629
630	/*
631	* Horrible hacks.
632	*/
633	case OP_FLD:
634	if (pDis->bOpCode == 0xdb) /* m80fp workaround. */
635	(int )&pDis->Param1.fParam &= ~0x1f; /* make it pure OP_PARM_M */
636	break;
637	case OP_LAR: /* hack w -> v, probably not correct. */
638	(int )&pDis->Param2.fParam &= ~0x1f;
639	(int )&pDis->Param2.fParam \|= OP_PARM_v;
640	break;
641	}
642
643	/*
644	* Formatting context and associated macros.
645	*/
646	PCDISOPPARAM pParam = &pDis->Param1;
647	int iParam = 1;
648
649	#define PUT_FAR() \
650	do { \
651	if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_p \
652	&& pOp->uOpcode != OP_LDS /* table bugs? */ \
653	&& pOp->uOpcode != OP_LES \
654	&& pOp->uOpcode != OP_LFS \
655	&& pOp->uOpcode != OP_LGS \
656	&& pOp->uOpcode != OP_LSS ) \
657	PUT_SZ("far "); \
658	} while (0)
659	/** @todo mov ah,ch ends up with a byte 'override'... - check if this wasn't fixed. */
660	/** @todo drop the work/dword/qword override when the src/dst is a register (except for movsx/movzx). */
661	#define PUT_SIZE_OVERRIDE() \
662	do { \
663	switch (OP_PARM_VSUBTYPE(pParam->fParam)) \
664	{ \
665	case OP_PARM_v: \
666	case OP_PARM_y: \
667	switch (pDis->uOpMode) \
668	{ \
669	case DISCPUMODE_16BIT: if (OP_PARM_VSUBTYPE(pParam->fParam) != OP_PARM_y) PUT_SZ("word "); break; \
670	case DISCPUMODE_32BIT: \
671	if (pDis->pCurInstr->uOpcode != OP_GATHER \|\| pDis->bVexWFlag) { PUT_SZ("dword "); break; } \
672	case DISCPUMODE_64BIT: PUT_SZ("qword "); break; \
673	default: break; \
674	} \
675	break; \
676	case OP_PARM_b: PUT_SZ("byte "); break; \
677	case OP_PARM_w: \
678	if (OP_PARM_VTYPE(pParam->fParam) == OP_PARM_W \|\| \
679	OP_PARM_VTYPE(pParam->fParam) == OP_PARM_M) \
680	{ \
681	if (VEXREG_IS256B(pDis->bVexDestReg)) PUT_SZ("dword "); \
682	else PUT_SZ("word "); \
683	} \
684	break; \
685	case OP_PARM_d: \
686	if (OP_PARM_VTYPE(pParam->fParam) == OP_PARM_W \|\| \
687	OP_PARM_VTYPE(pParam->fParam) == OP_PARM_M) \
688	{ \
689	if (VEXREG_IS256B(pDis->bVexDestReg)) PUT_SZ("qword "); \
690	else PUT_SZ("dword "); \
691	} \
692	break; \
693	case OP_PARM_q: \
694	if (OP_PARM_VTYPE(pParam->fParam) == OP_PARM_W \|\| \
695	OP_PARM_VTYPE(pParam->fParam) == OP_PARM_M) \
696	{ \
697	if (VEXREG_IS256B(pDis->bVexDestReg)) PUT_SZ("oword "); \
698	else PUT_SZ("qword "); \
699	} \
700	break; \
701	case OP_PARM_ps: \
702	case OP_PARM_pd: \
703	case OP_PARM_x: if (VEXREG_IS256B(pDis->bVexDestReg)) { PUT_SZ("yword "); break; } \
704	case OP_PARM_ss: \
705	case OP_PARM_sd: \
706	case OP_PARM_dq: PUT_SZ("oword "); break; \
707	case OP_PARM_qq: PUT_SZ("yword "); break; \
708	case OP_PARM_p: break; /* see PUT_FAR */ \
709	case OP_PARM_s: if (pParam->fUse & DISUSE_REG_FP) PUT_SZ("tword "); break; /* ?? */ \
710	case OP_PARM_z: break; \
711	case OP_PARM_NONE: \
712	if ( OP_PARM_VTYPE(pParam->fParam) == OP_PARM_M \
713	&& ((pParam->fUse & DISUSE_REG_FP) \|\| pOp->uOpcode == OP_FLD)) \
714	PUT_SZ("tword "); \
715	break; \
716	default: break; /no pointer type specified/necessary/ \
717	} \
718	} while (0)
719	static const char s_szSegPrefix[6][4] = { "es:", "cs:", "ss:", "ds:", "fs:", "gs:" };
720	#define PUT_SEGMENT_OVERRIDE() \
721	do { \
722	if (pDis->fPrefix & DISPREFIX_SEG) \
723	PUT_STR(s_szSegPrefix[pDis->idxSegPrefix], 3); \
724	} while (0)
725
726
727	/*
728	* Segment prefixing for instructions that doesn't do memory access.
729	*/
730	if ( (pDis->fPrefix & DISPREFIX_SEG)
731	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param1.fUse)
732	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param2.fUse)
733	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param3.fUse))
734	{
735	PUT_STR(s_szSegPrefix[pDis->idxSegPrefix], 2);
736	PUT_C(' ');
737	}
738
739
740	/*
741	* The formatting loop.
742	*/
743	RTINTPTR off;
744	char szSymbol[128];
745	char ch;
746	while ((ch = *pszFmt++) != '\0')
747	{
748	if (ch == '%')
749	{
750	ch = *pszFmt++;
751	switch (ch)
752	{
753	/*
754	* ModRM - Register only.
755	*/
756	case 'C': /* Control register (ParseModRM / UseModRM). */
757	case 'D': /* Debug register (ParseModRM / UseModRM). */
758	case 'G': /* ModRM selects general register (ParseModRM / UseModRM). */
759	case 'S': /* ModRM byte selects a segment register (ParseModRM / UseModRM). */
760	case 'T': /* ModRM byte selects a test register (ParseModRM / UseModRM). */
761	case 'V': /* ModRM byte selects an XMM/SSE register (ParseModRM / UseModRM). */
762	case 'P': /* ModRM byte selects MMX register (ParseModRM / UseModRM). */
763	case 'H': /* The VEX.vvvv field of the VEX prefix selects a XMM/YMM register. */
764	case 'L': /* The upper 4 bits of the 8-bit immediate selects a XMM/YMM register. */
765	{
766	pszFmt += RT_C_IS_ALPHA(pszFmt[0]) ? RT_C_IS_ALPHA(pszFmt[1]) ? 2 : 1 : 0;
767	Assert(!(pParam->fUse & (DISUSE_INDEX \| DISUSE_SCALE) /* No SIB here... */));
768	Assert(!(pParam->fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32)));
769
770	size_t cchReg;
771	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
772	PUT_STR(pszReg, cchReg);
773	break;
774	}
775
776	/*
777	* ModRM - Register or memory.
778	*/
779	case 'E': /* ModRM specifies parameter (ParseModRM / UseModRM / UseSIB). */
780	case 'Q': /* ModRM byte selects MMX register or memory address (ParseModRM / UseModRM). */
781	case 'R': /* ModRM byte may only refer to a general register (ParseModRM / UseModRM). */
782	case 'W': /* ModRM byte selects an XMM/SSE register or a memory address (ParseModRM / UseModRM). */
783	case 'M': /* ModRM may only refer to memory (ParseModRM / UseModRM). */
784	{
785	pszFmt += RT_C_IS_ALPHA(pszFmt[0]) ? RT_C_IS_ALPHA(pszFmt[1]) ? 2 : 1 : 0;
786
787	PUT_FAR();
788	uint32_t const fUse = pParam->fUse;
789	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
790	{
791	/* Work around mov seg,[mem16] and mov [mem16],seg as these always make a 16-bit mem
792	while the register variants deals with 16, 32 & 64 in the normal fashion. */
793	if ( pParam->fParam != OP_PARM_Ev
794	\|\| pOp->uOpcode != OP_MOV
795	\|\| ( pOp->fParam1 != OP_PARM_Sw
796	&& pOp->fParam2 != OP_PARM_Sw))
797	PUT_SIZE_OVERRIDE();
798	PUT_C('[');
799	}
800	if ( (fFlags & DIS_FMT_FLAGS_STRICT)
801	&& (fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32)))
802	{
803	if ( (fUse & DISUSE_DISPLACEMENT8)
804	&& !pParam->uDisp.i8)
805	PUT_SZ("byte ");
806	else if ( (fUse & DISUSE_DISPLACEMENT16)
807	&& (int8_t)pParam->uDisp.i16 == (int16_t)pParam->uDisp.i16)
808	PUT_SZ("word ");
809	else if ( (fUse & DISUSE_DISPLACEMENT32)
810	&& (int16_t)pParam->uDisp.i32 == (int32_t)pParam->uDisp.i32) //??
811	PUT_SZ("dword ");
812	else if ( (fUse & DISUSE_DISPLACEMENT64)
813	&& (pDis->SIB.Bits.Base != 5 \|\| pDis->ModRM.Bits.Mod != 0)
814	&& (int32_t)pParam->uDisp.i64 == (int64_t)pParam->uDisp.i64) //??
815	PUT_SZ("qword ");
816	}
817	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
818	PUT_SEGMENT_OVERRIDE();
819
820	bool fBase = (fUse & DISUSE_BASE) /* When exactly is DISUSE_BASE supposed to be set? disasmModRMReg doesn't set it. */
821	\|\| ( (fUse & ( DISUSE_REG_GEN8
822	\| DISUSE_REG_GEN16
823	\| DISUSE_REG_GEN32
824	\| DISUSE_REG_GEN64
825	\| DISUSE_REG_FP
826	\| DISUSE_REG_MMX
827	\| DISUSE_REG_XMM
828	\| DISUSE_REG_YMM
829	\| DISUSE_REG_CR
830	\| DISUSE_REG_DBG
831	\| DISUSE_REG_SEG
832	\| DISUSE_REG_TEST ))
833	&& !DISUSE_IS_EFFECTIVE_ADDR(fUse));
834	if (fBase)
835	{
836	size_t cchReg;
837	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
838	PUT_STR(pszReg, cchReg);
839	}
840
841	if (fUse & DISUSE_INDEX)
842	{
843	if (fBase)
844	PUT_C('+');
845
846	size_t cchReg;
847	const char *pszReg = disasmFormatYasmIndexReg(pDis, pParam, &cchReg);
848	PUT_STR(pszReg, cchReg);
849
850	if (fUse & DISUSE_SCALE)
851	{
852	PUT_C('*');
853	PUT_C('0' + pParam->uScale);
854	}
855	}
856	else
857	Assert(!(fUse & DISUSE_SCALE));
858
859	int64_t off2 = 0;
860	if (fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32))
861	{
862	if (fUse & DISUSE_DISPLACEMENT8)
863	off2 = pParam->uDisp.i8;
864	else if (fUse & DISUSE_DISPLACEMENT16)
865	off2 = pParam->uDisp.i16;
866	else if (fUse & (DISUSE_DISPLACEMENT32 \| DISUSE_RIPDISPLACEMENT32))
867	off2 = pParam->uDisp.i32;
868	else if (fUse & DISUSE_DISPLACEMENT64)
869	off2 = pParam->uDisp.i64;
870	else
871	{
872	AssertFailed();
873	off2 = 0;
874	}
875
876	if (fBase \|\| (fUse & DISUSE_INDEX))
877	{
878	PUT_C(off2 >= 0 ? '+' : '-');
879	if (off2 < 0)
880	off2 = -off2;
881	}
882	if (fUse & DISUSE_DISPLACEMENT8)
883	PUT_NUM_8( off2);
884	else if (fUse & DISUSE_DISPLACEMENT16)
885	PUT_NUM_16(off2);
886	else if (fUse & DISUSE_DISPLACEMENT32)
887	PUT_NUM_32(off2);
888	else if (fUse & DISUSE_DISPLACEMENT64)
889	PUT_NUM_64(off2);
890	else
891	{
892	PUT_NUM_32(off2);
893	PUT_SZ(" wrt rip"); //??
894	}
895	}
896
897	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
898	{
899	if (pfnGetSymbol && !fBase && !(fUse & DISUSE_INDEX) && off2 != 0)
900	PUT_SYMBOL((pDis->fPrefix & DISPREFIX_SEG)
901	? DIS_FMT_SEL_FROM_REG(pDis->idxSegPrefix)
902	: DIS_FMT_SEL_FROM_REG(DISSELREG_DS),
903	pDis->uAddrMode == DISCPUMODE_64BIT
904	? (uint64_t)off2
905	: pDis->uAddrMode == DISCPUMODE_32BIT
906	? (uint32_t)off2
907	: (uint16_t)off2,
908	" (=", ')');
909	PUT_C(']');
910	}
911	break;
912	}
913
914	case 'F': /* Eflags register (0 - popf/pushf only, avoided in adjustments above). */
915	AssertFailed();
916	break;
917
918	case 'I': /* Immediate data (ParseImmByte, ParseImmByteSX, ParseImmV, ParseImmUshort, ParseImmZ). */
919	Assert(pszFmt == 'b' \|\| pszFmt == 'v' \|\| pszFmt == 'w' \|\| pszFmt == 'z'); pszFmt++;
920	switch (pParam->fUse & ( DISUSE_IMMEDIATE8 \| DISUSE_IMMEDIATE16 \| DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64
921	\| DISUSE_IMMEDIATE16_SX8 \| DISUSE_IMMEDIATE32_SX8 \| DISUSE_IMMEDIATE64_SX8))
922	{
923	case DISUSE_IMMEDIATE8:
924	if ( (fFlags & DIS_FMT_FLAGS_STRICT)
925	&& ( (pOp->fParam1 >= OP_PARM_REG_GEN8_START && pOp->fParam1 <= OP_PARM_REG_GEN8_END)
926	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN8_START && pOp->fParam2 <= OP_PARM_REG_GEN8_END))
927	)
928	PUT_SZ("strict byte ");
929	PUT_NUM_8(pParam->uValue);
930	break;
931
932	case DISUSE_IMMEDIATE16:
933	if ( pDis->uCpuMode != pDis->uOpMode
934	\|\| ( (fFlags & DIS_FMT_FLAGS_STRICT)
935	&& ( (int8_t)pParam->uValue == (int16_t)pParam->uValue
936	\|\| (pOp->fParam1 >= OP_PARM_REG_GEN16_START && pOp->fParam1 <= OP_PARM_REG_GEN16_END)
937	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN16_START && pOp->fParam2 <= OP_PARM_REG_GEN16_END))
938	)
939	)
940	{
941	if (OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_b)
942	PUT_SZ_STRICT("strict byte ", "byte ");
943	else if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_v
944	\|\| OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_z)
945	PUT_SZ_STRICT("strict word ", "word ");
946	}
947	PUT_NUM_16(pParam->uValue);
948	break;
949
950	case DISUSE_IMMEDIATE16_SX8:
951	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
952	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
953	PUT_SZ_STRICT("strict byte ", "byte ");
954	else
955	PUT_SZ("word ");
956	PUT_NUM_16(pParam->uValue);
957	break;
958
959	case DISUSE_IMMEDIATE32:
960	if ( pDis->uOpMode != (pDis->uCpuMode == DISCPUMODE_16BIT ? DISCPUMODE_16BIT : DISCPUMODE_32BIT) /* not perfect */
961	\|\| ( (fFlags & DIS_FMT_FLAGS_STRICT)
962	&& ( (int8_t)pParam->uValue == (int32_t)pParam->uValue
963	\|\| (pOp->fParam1 >= OP_PARM_REG_GEN32_START && pOp->fParam1 <= OP_PARM_REG_GEN32_END)
964	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN32_START && pOp->fParam2 <= OP_PARM_REG_GEN32_END))
965	)
966	)
967	{
968	if (OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_b)
969	PUT_SZ_STRICT("strict byte ", "byte ");
970	else if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_v
971	\|\| OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_z)
972	PUT_SZ_STRICT("strict dword ", "dword ");
973	}
974	PUT_NUM_32(pParam->uValue);
975	if (pDis->uCpuMode == DISCPUMODE_32BIT)
976	PUT_SYMBOL(DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uValue, " (=", ')');
977	break;
978
979	case DISUSE_IMMEDIATE32_SX8:
980	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
981	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
982	PUT_SZ_STRICT("strict byte ", "byte ");
983	else
984	PUT_SZ("dword ");
985	PUT_NUM_32(pParam->uValue);
986	break;
987
988	case DISUSE_IMMEDIATE64_SX8:
989	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
990	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
991	PUT_SZ_STRICT("strict byte ", "byte ");
992	else
993	PUT_SZ("qword ");
994	PUT_NUM_64(pParam->uValue);
995	break;
996
997	case DISUSE_IMMEDIATE64:
998	PUT_NUM_64(pParam->uValue);
999	break;
1000
1001	default:
1002	AssertFailed();
1003	break;
1004	}
1005	break;
1006
1007	case 'J': /* Relative jump offset (ParseImmBRel + ParseImmVRel). */
1008	{
1009	int32_t offDisplacement;
1010	Assert(iParam == 1);
1011	bool fPrefix = (fFlags & DIS_FMT_FLAGS_STRICT)
1012	&& pOp->uOpcode != OP_CALL
1013	&& pOp->uOpcode != OP_LOOP
1014	&& pOp->uOpcode != OP_LOOPE
1015	&& pOp->uOpcode != OP_LOOPNE
1016	&& pOp->uOpcode != OP_JECXZ;
1017	if (pOp->uOpcode == OP_CALL)
1018	fFlags &= ~DIS_FMT_FLAGS_RELATIVE_BRANCH;
1019
1020	if (pParam->fUse & DISUSE_IMMEDIATE8_REL)
1021	{
1022	if (fPrefix)
1023	PUT_SZ("short ");
1024	offDisplacement = (int8_t)pParam->uValue;
1025	Assert(*pszFmt == 'b'); pszFmt++;
1026
1027	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
1028	PUT_NUM_S8(offDisplacement);
1029	}
1030	else if (pParam->fUse & DISUSE_IMMEDIATE16_REL)
1031	{
1032	if (fPrefix)
1033	PUT_SZ("near ");
1034	offDisplacement = (int16_t)pParam->uValue;
1035	Assert(*pszFmt == 'v'); pszFmt++;
1036
1037	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
1038	PUT_NUM_S16(offDisplacement);
1039	}
1040	else
1041	{
1042	if (fPrefix)
1043	PUT_SZ("near ");
1044	offDisplacement = (int32_t)pParam->uValue;
1045	Assert(pParam->fUse & (DISUSE_IMMEDIATE32_REL \| DISUSE_IMMEDIATE64_REL));
1046	Assert(*pszFmt == 'v'); pszFmt++;
1047
1048	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
1049	PUT_NUM_S32(offDisplacement);
1050	}
1051	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
1052	PUT_SZ(" (");
1053
1054	RTUINTPTR uTrgAddr = pDis->uInstrAddr + pDis->cbInstr + offDisplacement;
1055	if (pDis->uCpuMode == DISCPUMODE_16BIT)
1056	PUT_NUM_16(uTrgAddr);
1057	else if (pDis->uCpuMode == DISCPUMODE_32BIT)
1058	PUT_NUM_32(uTrgAddr);
1059	else
1060	PUT_NUM_64(uTrgAddr);
1061
1062	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
1063	{
1064	PUT_SYMBOL(DIS_FMT_SEL_FROM_REG(DISSELREG_CS), uTrgAddr, " = ", ' ');
1065	PUT_C(')');
1066	}
1067	else
1068	PUT_SYMBOL(DIS_FMT_SEL_FROM_REG(DISSELREG_CS), uTrgAddr, " (", ')');
1069	break;
1070	}
1071
1072	case 'A': /* Direct (jump/call) address (ParseImmAddr). */
1073	{
1074	Assert(*pszFmt == 'p'); pszFmt++;
1075	PUT_FAR();
1076	PUT_SIZE_OVERRIDE();
1077	PUT_SEGMENT_OVERRIDE();
1078	int rc = VERR_SYMBOL_NOT_FOUND;
1079	switch (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16 \| DISUSE_IMMEDIATE_ADDR_16_32 \| DISUSE_DISPLACEMENT64 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT16))
1080	{
1081	case DISUSE_IMMEDIATE_ADDR_16_16:
1082	PUT_NUM_16(pParam->uValue >> 16);
1083	PUT_C(':');
1084	PUT_NUM_16(pParam->uValue);
1085	if (pfnGetSymbol)
1086	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1087	break;
1088	case DISUSE_IMMEDIATE_ADDR_16_32:
1089	PUT_NUM_16(pParam->uValue >> 32);
1090	PUT_C(':');
1091	PUT_NUM_32(pParam->uValue);
1092	if (pfnGetSymbol)
1093	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1094	break;
1095	case DISUSE_DISPLACEMENT16:
1096	PUT_NUM_16(pParam->uValue);
1097	if (pfnGetSymbol)
1098	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1099	break;
1100	case DISUSE_DISPLACEMENT32:
1101	PUT_NUM_32(pParam->uValue);
1102	if (pfnGetSymbol)
1103	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1104	break;
1105	case DISUSE_DISPLACEMENT64:
1106	PUT_NUM_64(pParam->uValue);
1107	if (pfnGetSymbol)
1108	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint64_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1109	break;
1110	default:
1111	AssertFailed();
1112	break;
1113	}
1114
1115	PUT_SYMBOL_TWO(rc, " [", ']');
1116	break;
1117	}
1118
1119	case 'O': /* No ModRM byte (ParseImmAddr). */
1120	{
1121	Assert(pszFmt == 'b' \|\| pszFmt == 'v'); pszFmt++;
1122	PUT_FAR();
1123	PUT_SIZE_OVERRIDE();
1124	PUT_C('[');
1125	PUT_SEGMENT_OVERRIDE();
1126	int rc = VERR_SYMBOL_NOT_FOUND;
1127	switch (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16 \| DISUSE_IMMEDIATE_ADDR_16_32 \| DISUSE_DISPLACEMENT64 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT16))
1128	{
1129	case DISUSE_IMMEDIATE_ADDR_16_16:
1130	PUT_NUM_16(pParam->uValue >> 16);
1131	PUT_C(':');
1132	PUT_NUM_16(pParam->uValue);
1133	if (pfnGetSymbol)
1134	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1135	break;
1136	case DISUSE_IMMEDIATE_ADDR_16_32:
1137	PUT_NUM_16(pParam->uValue >> 32);
1138	PUT_C(':');
1139	PUT_NUM_32(pParam->uValue);
1140	if (pfnGetSymbol)
1141	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1142	break;
1143	case DISUSE_DISPLACEMENT16:
1144	PUT_NUM_16(pParam->uDisp.i16);
1145	if (pfnGetSymbol)
1146	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u16, szSymbol, sizeof(szSymbol), &off, pvUser);
1147	break;
1148	case DISUSE_DISPLACEMENT32:
1149	PUT_NUM_32(pParam->uDisp.i32);
1150	if (pfnGetSymbol)
1151	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u32, szSymbol, sizeof(szSymbol), &off, pvUser);
1152	break;
1153	case DISUSE_DISPLACEMENT64:
1154	PUT_NUM_64(pParam->uDisp.i64);
1155	if (pfnGetSymbol)
1156	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u64, szSymbol, sizeof(szSymbol), &off, pvUser);
1157	break;
1158	default:
1159	AssertFailed();
1160	break;
1161	}
1162	PUT_C(']');
1163
1164	PUT_SYMBOL_TWO(rc, " (", ')');
1165	break;
1166	}
1167
1168	case 'X': /* DS:SI (ParseXb, ParseXv). */
1169	case 'Y': /* ES:DI (ParseYb, ParseYv). */
1170	{
1171	Assert(pszFmt == 'b' \|\| pszFmt == 'v'); pszFmt++;
1172	PUT_FAR();
1173	PUT_SIZE_OVERRIDE();
1174	PUT_C('[');
1175	if (pParam->fUse & DISUSE_POINTER_DS_BASED)
1176	PUT_SZ("ds:");
1177	else
1178	PUT_SZ("es:");
1179
1180	size_t cchReg;
1181	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
1182	PUT_STR(pszReg, cchReg);
1183	PUT_C(']');
1184	break;
1185	}
1186
1187	case 'e': /* Register based on operand size (e.g. %eAX, %eAH) (ParseFixedReg). */
1188	{
1189	Assert(RT_C_IS_ALPHA(pszFmt[0]) && RT_C_IS_ALPHA(pszFmt[1]) && !RT_C_IS_ALPHA(pszFmt[2]));
1190	pszFmt += 2;
1191	size_t cchReg;
1192	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
1193	PUT_STR(pszReg, cchReg);
1194	break;
1195	}
1196
1197	default:
1198	AssertMsgFailed(("%c%s!\n", ch, pszFmt));
1199	break;
1200	}
1201	AssertMsg(pszFmt == ',' \|\| pszFmt == '\0', ("%c%s\n", ch, pszFmt));
1202	}
1203	else
1204	{
1205	PUT_C(ch);
1206	if (ch == ',')
1207	{
1208	Assert(*pszFmt != ' ');
1209	PUT_C(' ');
1210	switch (++iParam)
1211	{
1212	case 2: pParam = &pDis->Param2; break;
1213	case 3: pParam = &pDis->Param3; break;
1214	case 4: pParam = &pDis->Param4; break;
1215	default: pParam = NULL; break;
1216	}
1217	}
1218	}
1219	} /* while more to format */
1220	}
1221
1222	/*
1223	* Any additional output to the right of the instruction?
1224	*/
1225	if (fFlags & (DIS_FMT_FLAGS_BYTES_RIGHT \| DIS_FMT_FLAGS_ADDR_RIGHT))
1226	{
1227	/* some up front padding. */
1228	size_t cchPadding = cchOutput - offInstruction;
1229	cchPadding = cchPadding + 1 >= 42 ? 1 : 42 - cchPadding;
1230	PUT_STR(g_szSpaces, cchPadding);
1231
1232	/* comment? */
1233	if (fFlags & (DIS_FMT_FLAGS_BYTES_RIGHT \| DIS_FMT_FLAGS_ADDR_RIGHT))
1234	PUT_SZ(";");
1235
1236	/*
1237	* The address?
1238	*/
1239	if (fFlags & DIS_FMT_FLAGS_ADDR_RIGHT)
1240	{
1241	PUT_C(' ');
1242	#if HC_ARCH_BITS == 64 \|\| GC_ARCH_BITS == 64
1243	if (pDis->uInstrAddr >= _4G)
1244	PUT_NUM(9, "%08x`", (uint32_t)(pDis->uInstrAddr >> 32));
1245	#endif
1246	PUT_NUM(8, "%08x", (uint32_t)pDis->uInstrAddr);
1247	}
1248
1249	/*
1250	* Opcode bytes?
1251	*/
1252	if (fFlags & DIS_FMT_FLAGS_BYTES_RIGHT)
1253	{
1254	PUT_C(' ');
1255	size_t cchTmp = disFormatBytes(pDis, pszDst, cchDst, fFlags);
1256	cchOutput += cchTmp;
1257	if (cchTmp >= cchDst)
1258	cchTmp = cchDst - (cchDst != 0);
1259	cchDst -= cchTmp;
1260	pszDst += cchTmp;
1261	}
1262	}
1263
1264	/*
1265	* Terminate it - on overflow we'll have reserved one byte for this.
1266	*/
1267	if (cchDst > 0)
1268	*pszDst = '\0';
1269	else
1270	Assert(!cchBuf);
1271
1272	/* clean up macros */
1273	#undef PUT_PSZ
1274	#undef PUT_SZ
1275	#undef PUT_STR
1276	#undef PUT_C
1277	return cchOutput;
1278	}
1279
1280
1281	/**
1282	* Formats the current instruction in Yasm (/ Nasm) style.
1283	*
1284	* This is a simplified version of DISFormatYasmEx() provided for your convenience.
1285	*
1286	*
1287	* @returns The number of output characters. If this is >= cchBuf, then the content
1288	* of pszBuf will be truncated.
1289	* @param pDis Pointer to the disassembler state.
1290	* @param pszBuf The output buffer.
1291	* @param cchBuf The size of the output buffer.
1292	*/
1293	DISDECL(size_t) DISFormatYasm(PCDISSTATE pDis, char *pszBuf, size_t cchBuf)
1294	{
1295	return DISFormatYasmEx(pDis, pszBuf, cchBuf, 0 /* fFlags /, NULL / pfnGetSymbol /, NULL / pvUser */);
1296	}
1297
1298
1299	/**
1300	* Checks if the encoding of the given disassembled instruction is something we
1301	* can never get YASM to produce.
1302	*
1303	* @returns true if it's odd, false if it isn't.
1304	* @param pDis The disassembler output. The byte fetcher callback will
1305	* be used if present as we might need to fetch opcode
1306	* bytes.
1307	*/
1308	DISDECL(bool) DISFormatYasmIsOddEncoding(PDISSTATE pDis)
1309	{
1310	/*
1311	* Mod rm + SIB: Check for duplicate EBP encodings that yasm won't use for very good reasons.
1312	*/
1313	if ( pDis->uAddrMode != DISCPUMODE_16BIT ///@todo correct?
1314	&& pDis->ModRM.Bits.Rm == 4
1315	&& pDis->ModRM.Bits.Mod != 3)
1316	{
1317	/* No scaled index SIB (index=4), except for ESP. */
1318	if ( pDis->SIB.Bits.Index == 4
1319	&& pDis->SIB.Bits.Base != 4)
1320	return true;
1321
1322	/* EBP + displacement */
1323	if ( pDis->ModRM.Bits.Mod != 0
1324	&& pDis->SIB.Bits.Base == 5
1325	&& pDis->SIB.Bits.Scale == 0)
1326	return true;
1327	}
1328
1329	/*
1330	* Seems to be an instruction alias here, but I cannot find any docs on it... hrmpf!
1331	*/
1332	if ( pDis->pCurInstr->uOpcode == OP_SHL
1333	&& pDis->ModRM.Bits.Reg == 6)
1334	return true;
1335
1336	/*
1337	* Check for multiple prefixes of the same kind.
1338	*/
1339	uint8_t off1stSeg = UINT8_MAX;
1340	uint8_t offOpSize = UINT8_MAX;
1341	uint8_t offAddrSize = UINT8_MAX;
1342	uint32_t fPrefixes = 0;
1343	for (uint32_t offOpcode = 0; offOpcode < RT_ELEMENTS(pDis->abInstr); offOpcode++)
1344	{
1345	uint32_t f;
1346	switch (pDis->abInstr[offOpcode])
1347	{
1348	case 0xf0:
1349	f = DISPREFIX_LOCK;
1350	break;
1351
1352	case 0xf2:
1353	case 0xf3:
1354	f = DISPREFIX_REP; /* yes, both */
1355	break;
1356
1357	case 0x2e:
1358	case 0x3e:
1359	case 0x26:
1360	case 0x36:
1361	case 0x64:
1362	case 0x65:
1363	if (off1stSeg == UINT8_MAX)
1364	off1stSeg = offOpcode;
1365	f = DISPREFIX_SEG;
1366	break;
1367
1368	case 0x66:
1369	if (offOpSize == UINT8_MAX)
1370	offOpSize = offOpcode;
1371	f = DISPREFIX_OPSIZE;
1372	break;
1373
1374	case 0x67:
1375	if (offAddrSize == UINT8_MAX)
1376	offAddrSize = offOpcode;
1377	f = DISPREFIX_ADDRSIZE;
1378	break;
1379
1380	case 0x40: case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x46: case 0x47:
1381	case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x4e: case 0x4f:
1382	f = pDis->uCpuMode == DISCPUMODE_64BIT ? DISPREFIX_REX : 0;
1383	break;
1384
1385	default:
1386	f = 0;
1387	break;
1388	}
1389	if (!f)
1390	break; /* done */
1391	if (fPrefixes & f)
1392	return true;
1393	fPrefixes \|= f;
1394	}
1395
1396	/* segment overrides are fun */
1397	if (fPrefixes & DISPREFIX_SEG)
1398	{
1399	/* no effective address which it may apply to. */
1400	Assert((pDis->fPrefix & DISPREFIX_SEG) \|\| pDis->uCpuMode == DISCPUMODE_64BIT);
1401	if ( !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param1.fUse)
1402	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param2.fUse)
1403	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param3.fUse))
1404	return true;
1405
1406	/* Yasm puts the segment prefixes before the operand prefix with no
1407	way of overriding it. */
1408	if (offOpSize < off1stSeg)
1409	return true;
1410	}
1411
1412	/* fixed register + addr override doesn't go down all that well. */
1413	if (fPrefixes & DISPREFIX_ADDRSIZE)
1414	{
1415	Assert(pDis->fPrefix & DISPREFIX_ADDRSIZE);
1416	if ( pDis->pCurInstr->fParam3 == OP_PARM_NONE
1417	&& pDis->pCurInstr->fParam2 == OP_PARM_NONE
1418	&& ( pDis->pCurInstr->fParam1 >= OP_PARM_REG_GEN32_START
1419	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_GEN32_END))
1420	return true;
1421	}
1422
1423	/* Almost all prefixes are bad for jumps. */
1424	if (fPrefixes)
1425	{
1426	switch (pDis->pCurInstr->uOpcode)
1427	{
1428	/* nop w/ prefix(es). */
1429	case OP_NOP:
1430	return true;
1431
1432	case OP_JMP:
1433	if ( pDis->pCurInstr->fParam1 != OP_PARM_Jb
1434	&& pDis->pCurInstr->fParam1 != OP_PARM_Jv)
1435	break;
1436	/* fall thru */
1437	case OP_JO:
1438	case OP_JNO:
1439	case OP_JC:
1440	case OP_JNC:
1441	case OP_JE:
1442	case OP_JNE:
1443	case OP_JBE:
1444	case OP_JNBE:
1445	case OP_JS:
1446	case OP_JNS:
1447	case OP_JP:
1448	case OP_JNP:
1449	case OP_JL:
1450	case OP_JNL:
1451	case OP_JLE:
1452	case OP_JNLE:
1453	/** @todo branch hinting 0x2e/0x3e... */
1454	return true;
1455	}
1456
1457	}
1458
1459	/* All but the segment prefix is bad news for push/pop. */
1460	if (fPrefixes & ~DISPREFIX_SEG)
1461	{
1462	switch (pDis->pCurInstr->uOpcode)
1463	{
1464	case OP_POP:
1465	case OP_PUSH:
1466	if ( pDis->pCurInstr->fParam1 >= OP_PARM_REG_SEG_START
1467	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_SEG_END)
1468	return true;
1469	if ( (fPrefixes & ~DISPREFIX_OPSIZE)
1470	&& pDis->pCurInstr->fParam1 >= OP_PARM_REG_GEN32_START
1471	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_GEN32_END)
1472	return true;
1473	break;
1474
1475	case OP_POPA:
1476	case OP_POPF:
1477	case OP_PUSHA:
1478	case OP_PUSHF:
1479	if (fPrefixes & ~DISPREFIX_OPSIZE)
1480	return true;
1481	break;
1482	}
1483	}
1484
1485	/* Implicit 8-bit register instructions doesn't mix with operand size. */
1486	if ( (fPrefixes & DISPREFIX_OPSIZE)
1487	&& ( ( pDis->pCurInstr->fParam1 == OP_PARM_Gb /* r8 */
1488	&& pDis->pCurInstr->fParam2 == OP_PARM_Eb /* r8/mem8 */)
1489	\|\| ( pDis->pCurInstr->fParam2 == OP_PARM_Gb /* r8 */
1490	&& pDis->pCurInstr->fParam1 == OP_PARM_Eb /* r8/mem8 */))
1491	)
1492	{
1493	switch (pDis->pCurInstr->uOpcode)
1494	{
1495	case OP_ADD:
1496	case OP_OR:
1497	case OP_ADC:
1498	case OP_SBB:
1499	case OP_AND:
1500	case OP_SUB:
1501	case OP_XOR:
1502	case OP_CMP:
1503	return true;
1504	default:
1505	break;
1506	}
1507	}
1508
1509	/* Instructions taking no address or operand which thus may be annoyingly
1510	difficult to format for yasm. */
1511	if (fPrefixes)
1512	{
1513	switch (pDis->pCurInstr->uOpcode)
1514	{
1515	case OP_STI:
1516	case OP_STC:
1517	case OP_CLI:
1518	case OP_CLD:
1519	case OP_CLC:
1520	case OP_INT:
1521	case OP_INT3:
1522	case OP_INTO:
1523	case OP_HLT:
1524	/** @todo Many more to can be added here. */
1525	return true;
1526	default:
1527	break;
1528	}
1529	}
1530
1531	/* FPU and other instructions that ignores operand size override. */
1532	if (fPrefixes & DISPREFIX_OPSIZE)
1533	{
1534	switch (pDis->pCurInstr->uOpcode)
1535	{
1536	/* FPU: */
1537	case OP_FIADD:
1538	case OP_FIMUL:
1539	case OP_FISUB:
1540	case OP_FISUBR:
1541	case OP_FIDIV:
1542	case OP_FIDIVR:
1543	/** @todo there are many more. */
1544	return true;
1545
1546	case OP_MOV:
1547	/** @todo could be that we're not disassembling these correctly. */
1548	if (pDis->pCurInstr->fParam1 == OP_PARM_Sw)
1549	return true;
1550	/** @todo what about the other way? */
1551	break;
1552
1553	default:
1554	break;
1555	}
1556	}
1557
1558
1559	/*
1560	* Check for the version of xyz reg,reg instruction that the assembler doesn't use.
1561	*
1562	* For example:
1563	* expected: 1aee sbb ch, dh ; SBB r8, r/m8
1564	* yasm: 18F5 sbb ch, dh ; SBB r/m8, r8
1565	*/
1566	if (pDis->ModRM.Bits.Mod == 3 /* reg,reg */)
1567	{
1568	switch (pDis->pCurInstr->uOpcode)
1569	{
1570	case OP_ADD:
1571	case OP_OR:
1572	case OP_ADC:
1573	case OP_SBB:
1574	case OP_AND:
1575	case OP_SUB:
1576	case OP_XOR:
1577	case OP_CMP:
1578	if ( ( pDis->pCurInstr->fParam1 == OP_PARM_Gb /* r8 */
1579	&& pDis->pCurInstr->fParam2 == OP_PARM_Eb /* r8/mem8 */)
1580	\|\| ( pDis->pCurInstr->fParam1 == OP_PARM_Gv /* rX */
1581	&& pDis->pCurInstr->fParam2 == OP_PARM_Ev /* rX/memX */))
1582	return true;
1583
1584	/* 82 (see table A-6). */
1585	if (pDis->bOpCode == 0x82)
1586	return true;
1587	break;
1588
1589	/* ff /0, fe /0, ff /1, fe /0 */
1590	case OP_DEC:
1591	case OP_INC:
1592	return true;
1593
1594	case OP_POP:
1595	case OP_PUSH:
1596	Assert(pDis->bOpCode == 0x8f);
1597	return true;
1598
1599	case OP_MOV:
1600	if ( pDis->bOpCode == 0x8a
1601	\|\| pDis->bOpCode == 0x8b)
1602	return true;
1603	break;
1604
1605	default:
1606	break;
1607	}
1608	}
1609
1610	/* shl eax,1 will be assembled to the form without the immediate byte. */
1611	if ( pDis->pCurInstr->fParam2 == OP_PARM_Ib
1612	&& (uint8_t)pDis->Param2.uValue == 1)
1613	{
1614	switch (pDis->pCurInstr->uOpcode)
1615	{
1616	case OP_SHL:
1617	case OP_SHR:
1618	case OP_SAR:
1619	case OP_RCL:
1620	case OP_RCR:
1621	case OP_ROL:
1622	case OP_ROR:
1623	return true;
1624	}
1625	}
1626
1627	/* And some more - see table A-6. */
1628	if (pDis->bOpCode == 0x82)
1629	{
1630	switch (pDis->pCurInstr->uOpcode)
1631	{
1632	case OP_ADD:
1633	case OP_OR:
1634	case OP_ADC:
1635	case OP_SBB:
1636	case OP_AND:
1637	case OP_SUB:
1638	case OP_XOR:
1639	case OP_CMP:
1640	return true;
1641	break;
1642	}
1643	}
1644
1645
1646	/* check for REX.X = 1 without SIB. */
1647
1648	/* Yasm encodes setnbe al with /2 instead of /0 like the AMD manual
1649	says (intel doesn't appear to care). */
1650	switch (pDis->pCurInstr->uOpcode)
1651	{
1652	case OP_SETO:
1653	case OP_SETNO:
1654	case OP_SETC:
1655	case OP_SETNC:
1656	case OP_SETE:
1657	case OP_SETNE:
1658	case OP_SETBE:
1659	case OP_SETNBE:
1660	case OP_SETS:
1661	case OP_SETNS:
1662	case OP_SETP:
1663	case OP_SETNP:
1664	case OP_SETL:
1665	case OP_SETNL:
1666	case OP_SETLE:
1667	case OP_SETNLE:
1668	AssertMsg(pDis->bOpCode >= 0x90 && pDis->bOpCode <= 0x9f, ("%#x\n", pDis->bOpCode));
1669	if (pDis->ModRM.Bits.Reg != 2)
1670	return true;
1671	break;
1672	}
1673
1674	/*
1675	* The MOVZX reg32,mem16 instruction without an operand size prefix
1676	* doesn't quite make sense...
1677	*/
1678	if ( pDis->pCurInstr->uOpcode == OP_MOVZX
1679	&& pDis->bOpCode == 0xB7
1680	&& (pDis->uCpuMode == DISCPUMODE_16BIT) != !!(fPrefixes & DISPREFIX_OPSIZE))
1681	return true;
1682
1683	return false;
1684	}
1685

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source: vbox/trunk/src/VBox/Disassembler/DisasmFormatYasm.cpp@ 53426

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