DisasmFormatYasm.cpp@ 45674

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1	/* $Id: DisasmFormatYasm.cpp 42369 2012-07-24 13:55:34Z 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_aszYasmRegCRx[16][5] =
71	{
72	"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"
73	};
74	static const char g_aszYasmRegDRx[16][5] =
75	{
76	"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"
77	};
78	static const char g_aszYasmRegTRx[16][5] =
79	{
80	"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"
81	};
82
83
84
85	/**
86	* Gets the base register name for the given parameter.
87	*
88	* @returns Pointer to the register name.
89	* @param pDis The disassembler state.
90	* @param pParam The parameter.
91	* @param pcchReg Where to store the length of the name.
92	*/
93	static const char disasmFormatYasmBaseReg(PCDISSTATE pDis, PCDISOPPARAM pParam, size_t pcchReg)
94	{
95	switch (pParam->fUse & ( DISUSE_REG_GEN8 \| DISUSE_REG_GEN16 \| DISUSE_REG_GEN32 \| DISUSE_REG_GEN64
96	\| DISUSE_REG_FP \| DISUSE_REG_MMX \| DISUSE_REG_XMM \| DISUSE_REG_CR
97	\| DISUSE_REG_DBG \| DISUSE_REG_SEG \| DISUSE_REG_TEST))
98
99	{
100	case DISUSE_REG_GEN8:
101	{
102	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen8));
103	const char *psz = g_aszYasmRegGen8[pParam->Base.idxGenReg];
104	*pcchReg = 2 + !!psz[2] + !!psz[3];
105	return psz;
106	}
107
108	case DISUSE_REG_GEN16:
109	{
110	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen16));
111	const char *psz = g_aszYasmRegGen16[pParam->Base.idxGenReg];
112	*pcchReg = 2 + !!psz[2] + !!psz[3];
113	return psz;
114	}
115
116	case DISUSE_REG_GEN32:
117	{
118	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen32));
119	const char *psz = g_aszYasmRegGen32[pParam->Base.idxGenReg];
120	*pcchReg = 2 + !!psz[2] + !!psz[3];
121	return psz;
122	}
123
124	case DISUSE_REG_GEN64:
125	{
126	Assert(pParam->Base.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen64));
127	const char *psz = g_aszYasmRegGen64[pParam->Base.idxGenReg];
128	*pcchReg = 2 + !!psz[2] + !!psz[3];
129	return psz;
130	}
131
132	case DISUSE_REG_FP:
133	{
134	Assert(pParam->Base.idxFpuReg < RT_ELEMENTS(g_aszYasmRegFP));
135	const char *psz = g_aszYasmRegFP[pParam->Base.idxFpuReg];
136	*pcchReg = 3;
137	return psz;
138	}
139
140	case DISUSE_REG_MMX:
141	{
142	Assert(pParam->Base.idxMmxReg < RT_ELEMENTS(g_aszYasmRegMMX));
143	const char *psz = g_aszYasmRegMMX[pParam->Base.idxMmxReg];
144	*pcchReg = 3;
145	return psz;
146	}
147
148	case DISUSE_REG_XMM:
149	{
150	Assert(pParam->Base.idxXmmReg < RT_ELEMENTS(g_aszYasmRegXMM));
151	const char *psz = g_aszYasmRegXMM[pParam->Base.idxMmxReg];
152	*pcchReg = 4 + !!psz[4];
153	return psz;
154	}
155
156	case DISUSE_REG_CR:
157	{
158	Assert(pParam->Base.idxCtrlReg < RT_ELEMENTS(g_aszYasmRegCRx));
159	const char *psz = g_aszYasmRegCRx[pParam->Base.idxCtrlReg];
160	*pcchReg = 3;
161	return psz;
162	}
163
164	case DISUSE_REG_DBG:
165	{
166	Assert(pParam->Base.idxDbgReg < RT_ELEMENTS(g_aszYasmRegDRx));
167	const char *psz = g_aszYasmRegDRx[pParam->Base.idxDbgReg];
168	*pcchReg = 3;
169	return psz;
170	}
171
172	case DISUSE_REG_SEG:
173	{
174	Assert(pParam->Base.idxSegReg < RT_ELEMENTS(g_aszYasmRegCRx));
175	const char *psz = g_aszYasmRegSeg[pParam->Base.idxSegReg];
176	*pcchReg = 2;
177	return psz;
178	}
179
180	case DISUSE_REG_TEST:
181	{
182	Assert(pParam->Base.idxTestReg < RT_ELEMENTS(g_aszYasmRegTRx));
183	const char *psz = g_aszYasmRegTRx[pParam->Base.idxTestReg];
184	*pcchReg = 3;
185	return psz;
186	}
187
188	default:
189	AssertMsgFailed(("%#x\n", pParam->fUse));
190	*pcchReg = 3;
191	return "r??";
192	}
193	}
194
195
196	/**
197	* Gets the index register name for the given parameter.
198	*
199	* @returns The index register name.
200	* @param pDis The disassembler state.
201	* @param pParam The parameter.
202	* @param pcchReg Where to store the length of the name.
203	*/
204	static const char disasmFormatYasmIndexReg(PCDISSTATE pDis, PCDISOPPARAM pParam, size_t pcchReg)
205	{
206	switch (pDis->uAddrMode)
207	{
208	case DISCPUMODE_16BIT:
209	{
210	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen16));
211	const char *psz = g_aszYasmRegGen16[pParam->Index.idxGenReg];
212	*pcchReg = 2 + !!psz[2] + !!psz[3];
213	return psz;
214	}
215
216	case DISCPUMODE_32BIT:
217	{
218	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen32));
219	const char *psz = g_aszYasmRegGen32[pParam->Index.idxGenReg];
220	*pcchReg = 2 + !!psz[2] + !!psz[3];
221	return psz;
222	}
223
224	case DISCPUMODE_64BIT:
225	{
226	Assert(pParam->Index.idxGenReg < RT_ELEMENTS(g_aszYasmRegGen64));
227	const char *psz = g_aszYasmRegGen64[pParam->Index.idxGenReg];
228	*pcchReg = 2 + !!psz[2] + !!psz[3];
229	return psz;
230	}
231
232	default:
233	AssertMsgFailed(("%#x %#x\n", pParam->fUse, pDis->uAddrMode));
234	*pcchReg = 3;
235	return "r??";
236	}
237	}
238
239
240	/**
241	* Formats the current instruction in Yasm (/ Nasm) style.
242	*
243	*
244	* @returns The number of output characters. If this is >= cchBuf, then the content
245	* of pszBuf will be truncated.
246	* @param pDis Pointer to the disassembler state.
247	* @param pszBuf The output buffer.
248	* @param cchBuf The size of the output buffer.
249	* @param fFlags Format flags, see DIS_FORMAT_FLAGS_*.
250	* @param pfnGetSymbol Get symbol name for a jmp or call target address. Optional.
251	* @param pvUser User argument for pfnGetSymbol.
252	*/
253	DISDECL(size_t) DISFormatYasmEx(PCDISSTATE pDis, char *pszBuf, size_t cchBuf, uint32_t fFlags,
254	PFNDISGETSYMBOL pfnGetSymbol, void *pvUser)
255	{
256	/*
257	* Input validation and massaging.
258	*/
259	AssertPtr(pDis);
260	AssertPtrNull(pszBuf);
261	Assert(pszBuf \|\| !cchBuf);
262	AssertPtrNull(pfnGetSymbol);
263	AssertMsg(DIS_FMT_FLAGS_IS_VALID(fFlags), ("%#x\n", fFlags));
264	if (fFlags & DIS_FMT_FLAGS_ADDR_COMMENT)
265	fFlags = (fFlags & ~DIS_FMT_FLAGS_ADDR_LEFT) \| DIS_FMT_FLAGS_ADDR_RIGHT;
266	if (fFlags & DIS_FMT_FLAGS_BYTES_COMMENT)
267	fFlags = (fFlags & ~DIS_FMT_FLAGS_BYTES_LEFT) \| DIS_FMT_FLAGS_BYTES_RIGHT;
268
269	PCDISOPCODE const pOp = pDis->pCurInstr;
270
271	/*
272	* Output macros
273	*/
274	char *pszDst = pszBuf;
275	size_t cchDst = cchBuf;
276	size_t cchOutput = 0;
277	#define PUT_C(ch) \
278	do { \
279	cchOutput++; \
280	if (cchDst > 1) \
281	{ \
282	cchDst--; \
283	*pszDst++ = (ch); \
284	} \
285	} while (0)
286	#define PUT_STR(pszSrc, cchSrc) \
287	do { \
288	cchOutput += (cchSrc); \
289	if (cchDst > (cchSrc)) \
290	{ \
291	memcpy(pszDst, (pszSrc), (cchSrc)); \
292	pszDst += (cchSrc); \
293	cchDst -= (cchSrc); \
294	} \
295	else if (cchDst > 1) \
296	{ \
297	memcpy(pszDst, (pszSrc), cchDst - 1); \
298	pszDst += cchDst - 1; \
299	cchDst = 1; \
300	} \
301	} while (0)
302	#define PUT_SZ(sz) \
303	PUT_STR((sz), sizeof(sz) - 1)
304	#define PUT_SZ_STRICT(szStrict, szRelaxed) \
305	do { if (fFlags & DIS_FMT_FLAGS_STRICT) PUT_SZ(szStrict); else PUT_SZ(szRelaxed); } while (0)
306	#define PUT_PSZ(psz) \
307	do { const size_t cchTmp = strlen(psz); PUT_STR((psz), cchTmp); } while (0)
308	#define PUT_NUM(cch, fmt, num) \
309	do { \
310	cchOutput += (cch); \
311	if (cchDst > 1) \
312	{ \
313	const size_t cchTmp = RTStrPrintf(pszDst, cchDst, fmt, (num)); \
314	pszDst += cchTmp; \
315	cchDst -= cchTmp; \
316	Assert(cchTmp == (cch) \|\| cchDst == 1); \
317	} \
318	} while (0)
319	/** @todo add two flags for choosing between %X / %x and h / 0x. */
320	#define PUT_NUM_8(num) PUT_NUM(4, "0%02xh", (uint8_t)(num))
321	#define PUT_NUM_16(num) PUT_NUM(6, "0%04xh", (uint16_t)(num))
322	#define PUT_NUM_32(num) PUT_NUM(10, "0%08xh", (uint32_t)(num))
323	#define PUT_NUM_64(num) PUT_NUM(18, "0%016RX64h", (uint64_t)(num))
324
325	#define PUT_NUM_SIGN(cch, fmt, num, stype, utype) \
326	do { \
327	if ((stype)(num) >= 0) \
328	{ \
329	PUT_C('+'); \
330	PUT_NUM(cch, fmt, (utype)(num)); \
331	} \
332	else \
333	{ \
334	PUT_C('-'); \
335	PUT_NUM(cch, fmt, (utype)-(stype)(num)); \
336	} \
337	} while (0)
338	#define PUT_NUM_S8(num) PUT_NUM_SIGN(4, "0%02xh", num, int8_t, uint8_t)
339	#define PUT_NUM_S16(num) PUT_NUM_SIGN(6, "0%04xh", num, int16_t, uint16_t)
340	#define PUT_NUM_S32(num) PUT_NUM_SIGN(10, "0%08xh", num, int32_t, uint32_t)
341	#define PUT_NUM_S64(num) PUT_NUM_SIGN(18, "0%016RX64h", num, int64_t, uint64_t)
342
343
344	/*
345	* The address?
346	*/
347	if (fFlags & DIS_FMT_FLAGS_ADDR_LEFT)
348	{
349	#if HC_ARCH_BITS == 64 \|\| GC_ARCH_BITS == 64
350	if (pDis->uInstrAddr >= _4G)
351	PUT_NUM(9, "%08x`", (uint32_t)(pDis->uInstrAddr >> 32));
352	#endif
353	PUT_NUM(8, "%08x", (uint32_t)pDis->uInstrAddr);
354	PUT_C(' ');
355	}
356
357	/*
358	* The opcode bytes?
359	*/
360	if (fFlags & DIS_FMT_FLAGS_BYTES_LEFT)
361	{
362	size_t cchTmp = disFormatBytes(pDis, pszDst, cchDst, fFlags);
363	cchOutput += cchTmp;
364	if (cchDst > 1)
365	{
366	if (cchTmp <= cchDst)
367	{
368	cchDst -= cchTmp;
369	pszDst += cchTmp;
370	}
371	else
372	{
373	pszDst += cchDst - 1;
374	cchDst = 1;
375	}
376	}
377
378	/* Some padding to align the instruction. */
379	size_t cchPadding = (7 * (2 + !!(fFlags & DIS_FMT_FLAGS_BYTES_SPACED)))
380	+ !!(fFlags & DIS_FMT_FLAGS_BYTES_BRACKETS) * 2
381	+ 2;
382	cchPadding = cchTmp + 1 >= cchPadding ? 1 : cchPadding - cchTmp;
383	PUT_STR(g_szSpaces, cchPadding);
384	}
385
386
387	/*
388	* Filter out invalid opcodes first as they need special
389	* treatment. UD2 is an exception and should be handled normally.
390	*/
391	size_t const offInstruction = cchOutput;
392	if ( pOp->uOpcode == OP_INVALID
393	\|\| ( pOp->uOpcode == OP_ILLUD2
394	&& (pDis->fPrefix & DISPREFIX_LOCK)))
395	PUT_SZ("Illegal opcode");
396	else
397	{
398	/*
399	* Prefixes
400	*/
401	if (pDis->fPrefix & DISPREFIX_LOCK)
402	PUT_SZ("lock ");
403	if(pDis->fPrefix & DISPREFIX_REP)
404	PUT_SZ("rep ");
405	else if(pDis->fPrefix & DISPREFIX_REPNE)
406	PUT_SZ("repne ");
407
408	/*
409	* Adjust the format string to the correct mnemonic
410	* or to avoid things the assembler cannot handle correctly.
411	*/
412	char szTmpFmt[48];
413	const char *pszFmt = pOp->pszOpcode;
414	switch (pOp->uOpcode)
415	{
416	case OP_JECXZ:
417	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "jcxz %Jb" : pDis->uOpMode == DISCPUMODE_32BIT ? "jecxz %Jb" : "jrcxz %Jb";
418	break;
419	case OP_PUSHF:
420	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "pushfw" : pDis->uOpMode == DISCPUMODE_32BIT ? "pushfd" : "pushfq";
421	break;
422	case OP_POPF:
423	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "popfw" : pDis->uOpMode == DISCPUMODE_32BIT ? "popfd" : "popfq";
424	break;
425	case OP_PUSHA:
426	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "pushaw" : "pushad";
427	break;
428	case OP_POPA:
429	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "popaw" : "popad";
430	break;
431	case OP_INSB:
432	pszFmt = "insb";
433	break;
434	case OP_INSWD:
435	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "insw" : pDis->uOpMode == DISCPUMODE_32BIT ? "insd" : "insq";
436	break;
437	case OP_OUTSB:
438	pszFmt = "outsb";
439	break;
440	case OP_OUTSWD:
441	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "outsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "outsd" : "outsq";
442	break;
443	case OP_MOVSB:
444	pszFmt = "movsb";
445	break;
446	case OP_MOVSWD:
447	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "movsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "movsd" : "movsq";
448	break;
449	case OP_CMPSB:
450	pszFmt = "cmpsb";
451	break;
452	case OP_CMPWD:
453	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cmpsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "cmpsd" : "cmpsq";
454	break;
455	case OP_SCASB:
456	pszFmt = "scasb";
457	break;
458	case OP_SCASWD:
459	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "scasw" : pDis->uOpMode == DISCPUMODE_32BIT ? "scasd" : "scasq";
460	break;
461	case OP_LODSB:
462	pszFmt = "lodsb";
463	break;
464	case OP_LODSWD:
465	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "lodsw" : pDis->uOpMode == DISCPUMODE_32BIT ? "lodsd" : "lodsq";
466	break;
467	case OP_STOSB:
468	pszFmt = "stosb";
469	break;
470	case OP_STOSWD:
471	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "stosw" : pDis->uOpMode == DISCPUMODE_32BIT ? "stosd" : "stosq";
472	break;
473	case OP_CBW:
474	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cbw" : pDis->uOpMode == DISCPUMODE_32BIT ? "cwde" : "cdqe";
475	break;
476	case OP_CWD:
477	pszFmt = pDis->uOpMode == DISCPUMODE_16BIT ? "cwd" : pDis->uOpMode == DISCPUMODE_32BIT ? "cdq" : "cqo";
478	break;
479	case OP_SHL:
480	Assert(pszFmt[3] == '/');
481	pszFmt += 4;
482	break;
483	case OP_XLAT:
484	pszFmt = "xlatb";
485	break;
486	case OP_INT3:
487	pszFmt = "int3";
488	break;
489
490	/*
491	* Don't know how to tell yasm to generate complicated nop stuff, so 'db' it.
492	*/
493	case OP_NOP:
494	if (pDis->bOpCode == 0x90)
495	/* fine, fine */;
496	else if (pszFmt[sizeof("nop %Ev") - 1] == '/' && pszFmt[sizeof("nop %Ev")] == 'p')
497	pszFmt = "prefetch %Eb";
498	else if (pDis->bOpCode == 0x1f)
499	{
500	Assert(pDis->cbInstr >= 3);
501	PUT_SZ("db 00fh, 01fh,");
502	PUT_NUM_8(MAKE_MODRM(pDis->ModRM.Bits.Mod, pDis->ModRM.Bits.Reg, pDis->ModRM.Bits.Rm));
503	for (unsigned i = 3; i < pDis->cbInstr; i++)
504	{
505	PUT_C(',');
506	PUT_NUM_8(0x90); ///@todo fixme.
507	}
508	pszFmt = "";
509	}
510	break;
511
512	default:
513	/* ST(X) -> stX (floating point) */
514	if (*pszFmt == 'f' && strchr(pszFmt, '('))
515	{
516	char *pszFmtDst = szTmpFmt;
517	char ch;
518	do
519	{
520	ch = *pszFmt++;
521	if (ch == 'S' && pszFmt[0] == 'T' && pszFmt[1] == '(')
522	{
523	*pszFmtDst++ = 's';
524	*pszFmtDst++ = 't';
525	pszFmt += 2;
526	ch = *pszFmt;
527	Assert(pszFmt[1] == ')');
528	pszFmt += 2;
529	*pszFmtDst++ = ch;
530	}
531	else
532	*pszFmtDst++ = ch;
533	} while (ch != '\0');
534	pszFmt = szTmpFmt;
535	}
536	break;
537
538	/*
539	* Horrible hacks.
540	*/
541	case OP_FLD:
542	if (pDis->bOpCode == 0xdb) /* m80fp workaround. */
543	(int )&pDis->Param1.fParam &= ~0x1f; /* make it pure OP_PARM_M */
544	break;
545	case OP_LAR: /* hack w -> v, probably not correct. */
546	(int )&pDis->Param2.fParam &= ~0x1f;
547	(int )&pDis->Param2.fParam \|= OP_PARM_v;
548	break;
549	}
550
551	/*
552	* Formatting context and associated macros.
553	*/
554	PCDISOPPARAM pParam = &pDis->Param1;
555	int iParam = 1;
556
557	#define PUT_FAR() \
558	do { \
559	if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_p \
560	&& pOp->uOpcode != OP_LDS /* table bugs? */ \
561	&& pOp->uOpcode != OP_LES \
562	&& pOp->uOpcode != OP_LFS \
563	&& pOp->uOpcode != OP_LGS \
564	&& pOp->uOpcode != OP_LSS ) \
565	PUT_SZ("far "); \
566	} while (0)
567	/** @todo mov ah,ch ends up with a byte 'override'... - check if this wasn't fixed. */
568	/** @todo drop the work/dword/qword override when the src/dst is a register (except for movsx/movzx). */
569	#define PUT_SIZE_OVERRIDE() \
570	do { \
571	switch (OP_PARM_VSUBTYPE(pParam->fParam)) \
572	{ \
573	case OP_PARM_v: \
574	switch (pDis->uOpMode) \
575	{ \
576	case DISCPUMODE_16BIT: PUT_SZ("word "); break; \
577	case DISCPUMODE_32BIT: PUT_SZ("dword "); break; \
578	case DISCPUMODE_64BIT: PUT_SZ("qword "); break; \
579	default: break; \
580	} \
581	break; \
582	case OP_PARM_b: PUT_SZ("byte "); break; \
583	case OP_PARM_w: PUT_SZ("word "); break; \
584	case OP_PARM_d: PUT_SZ("dword "); break; \
585	case OP_PARM_q: PUT_SZ("qword "); break; \
586	case OP_PARM_dq: \
587	if (OP_PARM_VTYPE(pParam->fParam) != OP_PARM_W) /* these are 128 bit, pray they are all unambiguous.. */ \
588	PUT_SZ("qword "); \
589	break; \
590	case OP_PARM_p: break; /* see PUT_FAR */ \
591	case OP_PARM_s: if (pParam->fUse & DISUSE_REG_FP) PUT_SZ("tword "); break; /* ?? */ \
592	case OP_PARM_z: break; \
593	case OP_PARM_NONE: \
594	if ( OP_PARM_VTYPE(pParam->fParam) == OP_PARM_M \
595	&& ((pParam->fUse & DISUSE_REG_FP) \|\| pOp->uOpcode == OP_FLD)) \
596	PUT_SZ("tword "); \
597	break; \
598	default: break; /no pointer type specified/necessary/ \
599	} \
600	} while (0)
601	static const char s_szSegPrefix[6][4] = { "es:", "cs:", "ss:", "ds:", "fs:", "gs:" };
602	#define PUT_SEGMENT_OVERRIDE() \
603	do { \
604	if (pDis->fPrefix & DISPREFIX_SEG) \
605	PUT_STR(s_szSegPrefix[pDis->idxSegPrefix], 3); \
606	} while (0)
607
608
609	/*
610	* Segment prefixing for instructions that doesn't do memory access.
611	*/
612	if ( (pDis->fPrefix & DISPREFIX_SEG)
613	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param1.fUse)
614	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param2.fUse)
615	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param3.fUse))
616	{
617	PUT_STR(s_szSegPrefix[pDis->idxSegPrefix], 2);
618	PUT_C(' ');
619	}
620
621
622	/*
623	* The formatting loop.
624	*/
625	RTINTPTR off;
626	char szSymbol[128];
627	char ch;
628	while ((ch = *pszFmt++) != '\0')
629	{
630	if (ch == '%')
631	{
632	ch = *pszFmt++;
633	switch (ch)
634	{
635	/*
636	* ModRM - Register only.
637	*/
638	case 'C': /* Control register (ParseModRM / UseModRM). */
639	case 'D': /* Debug register (ParseModRM / UseModRM). */
640	case 'G': /* ModRM selects general register (ParseModRM / UseModRM). */
641	case 'S': /* ModRM byte selects a segment register (ParseModRM / UseModRM). */
642	case 'T': /* ModRM byte selects a test register (ParseModRM / UseModRM). */
643	case 'V': /* ModRM byte selects an XMM/SSE register (ParseModRM / UseModRM). */
644	case 'P': /* ModRM byte selects MMX register (ParseModRM / UseModRM). */
645	{
646	pszFmt += RT_C_IS_ALPHA(pszFmt[0]) ? RT_C_IS_ALPHA(pszFmt[1]) ? 2 : 1 : 0;
647	Assert(!(pParam->fUse & (DISUSE_INDEX \| DISUSE_SCALE) /* No SIB here... */));
648	Assert(!(pParam->fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32)));
649
650	size_t cchReg;
651	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
652	PUT_STR(pszReg, cchReg);
653	break;
654	}
655
656	/*
657	* ModRM - Register or memory.
658	*/
659	case 'E': /* ModRM specifies parameter (ParseModRM / UseModRM / UseSIB). */
660	case 'Q': /* ModRM byte selects MMX register or memory address (ParseModRM / UseModRM). */
661	case 'R': /* ModRM byte may only refer to a general register (ParseModRM / UseModRM). */
662	case 'W': /* ModRM byte selects an XMM/SSE register or a memory address (ParseModRM / UseModRM). */
663	case 'M': /* ModRM may only refer to memory (ParseModRM / UseModRM). */
664	{
665	pszFmt += RT_C_IS_ALPHA(pszFmt[0]) ? RT_C_IS_ALPHA(pszFmt[1]) ? 2 : 1 : 0;
666
667	PUT_FAR();
668	uint32_t const fUse = pParam->fUse;
669	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
670	{
671	/* Work around mov seg,[mem16] and mov [mem16],seg as these always make a 16-bit mem
672	while the register variants deals with 16, 32 & 64 in the normal fashion. */
673	if ( pParam->fParam != OP_PARM_Ev
674	\|\| pOp->uOpcode != OP_MOV
675	\|\| ( pOp->fParam1 != OP_PARM_Sw
676	&& pOp->fParam2 != OP_PARM_Sw))
677	PUT_SIZE_OVERRIDE();
678	PUT_C('[');
679	}
680	if ( (fFlags & DIS_FMT_FLAGS_STRICT)
681	&& (fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32)))
682	{
683	if ( (fUse & DISUSE_DISPLACEMENT8)
684	&& !pParam->uDisp.i8)
685	PUT_SZ("byte ");
686	else if ( (fUse & DISUSE_DISPLACEMENT16)
687	&& (int8_t)pParam->uDisp.i16 == (int16_t)pParam->uDisp.i16)
688	PUT_SZ("word ");
689	else if ( (fUse & DISUSE_DISPLACEMENT32)
690	&& (int16_t)pParam->uDisp.i32 == (int32_t)pParam->uDisp.i32) //??
691	PUT_SZ("dword ");
692	else if ( (fUse & DISUSE_DISPLACEMENT64)
693	&& (pDis->SIB.Bits.Base != 5 \|\| pDis->ModRM.Bits.Mod != 0)
694	&& (int32_t)pParam->uDisp.i64 == (int64_t)pParam->uDisp.i64) //??
695	PUT_SZ("qword ");
696	}
697	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
698	PUT_SEGMENT_OVERRIDE();
699
700	bool fBase = (fUse & DISUSE_BASE) /* When exactly is DISUSE_BASE supposed to be set? disasmModRMReg doesn't set it. */
701	\|\| ( (fUse & ( DISUSE_REG_GEN8
702	\| DISUSE_REG_GEN16
703	\| DISUSE_REG_GEN32
704	\| DISUSE_REG_GEN64
705	\| DISUSE_REG_FP
706	\| DISUSE_REG_MMX
707	\| DISUSE_REG_XMM
708	\| DISUSE_REG_CR
709	\| DISUSE_REG_DBG
710	\| DISUSE_REG_SEG
711	\| DISUSE_REG_TEST ))
712	&& !DISUSE_IS_EFFECTIVE_ADDR(fUse));
713	if (fBase)
714	{
715	size_t cchReg;
716	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
717	PUT_STR(pszReg, cchReg);
718	}
719
720	if (fUse & DISUSE_INDEX)
721	{
722	if (fBase)
723	PUT_C('+');
724
725	size_t cchReg;
726	const char *pszReg = disasmFormatYasmIndexReg(pDis, pParam, &cchReg);
727	PUT_STR(pszReg, cchReg);
728
729	if (fUse & DISUSE_SCALE)
730	{
731	PUT_C('*');
732	PUT_C('0' + pParam->uScale);
733	}
734	}
735	else
736	Assert(!(fUse & DISUSE_SCALE));
737
738	if (fUse & (DISUSE_DISPLACEMENT8 \| DISUSE_DISPLACEMENT16 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT64 \| DISUSE_RIPDISPLACEMENT32))
739	{
740	int64_t off2;
741	if (fUse & DISUSE_DISPLACEMENT8)
742	off2 = pParam->uDisp.i8;
743	else if (fUse & DISUSE_DISPLACEMENT16)
744	off2 = pParam->uDisp.i16;
745	else if (fUse & (DISUSE_DISPLACEMENT32 \| DISUSE_RIPDISPLACEMENT32))
746	off2 = pParam->uDisp.i32;
747	else if (fUse & DISUSE_DISPLACEMENT64)
748	off2 = pParam->uDisp.i64;
749	else
750	{
751	AssertFailed();
752	off2 = 0;
753	}
754
755	if (fBase \|\| (fUse & DISUSE_INDEX))
756	{
757	PUT_C(off2 >= 0 ? '+' : '-');
758	if (off2 < 0)
759	off2 = -off2;
760	}
761	if (fUse & DISUSE_DISPLACEMENT8)
762	PUT_NUM_8( off2);
763	else if (fUse & DISUSE_DISPLACEMENT16)
764	PUT_NUM_16(off2);
765	else if (fUse & DISUSE_DISPLACEMENT32)
766	PUT_NUM_32(off2);
767	else if (fUse & DISUSE_DISPLACEMENT64)
768	PUT_NUM_64(off2);
769	else
770	{
771	PUT_NUM_32(off2);
772	PUT_SZ(" wrt rip"); //??
773	}
774	}
775
776	if (DISUSE_IS_EFFECTIVE_ADDR(fUse))
777	PUT_C(']');
778	break;
779	}
780
781	case 'F': /* Eflags register (0 - popf/pushf only, avoided in adjustments above). */
782	AssertFailed();
783	break;
784
785	case 'I': /* Immediate data (ParseImmByte, ParseImmByteSX, ParseImmV, ParseImmUshort, ParseImmZ). */
786	Assert(pszFmt == 'b' \|\| pszFmt == 'v' \|\| pszFmt == 'w' \|\| pszFmt == 'z'); pszFmt++;
787	switch (pParam->fUse & ( DISUSE_IMMEDIATE8 \| DISUSE_IMMEDIATE16 \| DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64
788	\| DISUSE_IMMEDIATE16_SX8 \| DISUSE_IMMEDIATE32_SX8 \| DISUSE_IMMEDIATE64_SX8))
789	{
790	case DISUSE_IMMEDIATE8:
791	if ( (fFlags & DIS_FMT_FLAGS_STRICT)
792	&& ( (pOp->fParam1 >= OP_PARM_REG_GEN8_START && pOp->fParam1 <= OP_PARM_REG_GEN8_END)
793	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN8_START && pOp->fParam2 <= OP_PARM_REG_GEN8_END))
794	)
795	PUT_SZ("strict byte ");
796	PUT_NUM_8(pParam->uValue);
797	break;
798
799	case DISUSE_IMMEDIATE16:
800	if ( pDis->uCpuMode != pDis->uOpMode
801	\|\| ( (fFlags & DIS_FMT_FLAGS_STRICT)
802	&& ( (int8_t)pParam->uValue == (int16_t)pParam->uValue
803	\|\| (pOp->fParam1 >= OP_PARM_REG_GEN16_START && pOp->fParam1 <= OP_PARM_REG_GEN16_END)
804	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN16_START && pOp->fParam2 <= OP_PARM_REG_GEN16_END))
805	)
806	)
807	{
808	if (OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_b)
809	PUT_SZ_STRICT("strict byte ", "byte ");
810	else if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_v
811	\|\| OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_z)
812	PUT_SZ_STRICT("strict word ", "word ");
813	}
814	PUT_NUM_16(pParam->uValue);
815	break;
816
817	case DISUSE_IMMEDIATE16_SX8:
818	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
819	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
820	PUT_SZ_STRICT("strict byte ", "byte ");
821	else
822	PUT_SZ("word ");
823	PUT_NUM_16(pParam->uValue);
824	break;
825
826	case DISUSE_IMMEDIATE32:
827	if ( pDis->uOpMode != (pDis->uCpuMode == DISCPUMODE_16BIT ? DISCPUMODE_16BIT : DISCPUMODE_32BIT) /* not perfect */
828	\|\| ( (fFlags & DIS_FMT_FLAGS_STRICT)
829	&& ( (int8_t)pParam->uValue == (int32_t)pParam->uValue
830	\|\| (pOp->fParam1 >= OP_PARM_REG_GEN32_START && pOp->fParam1 <= OP_PARM_REG_GEN32_END)
831	\|\| (pOp->fParam2 >= OP_PARM_REG_GEN32_START && pOp->fParam2 <= OP_PARM_REG_GEN32_END))
832	)
833	)
834	{
835	if (OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_b)
836	PUT_SZ_STRICT("strict byte ", "byte ");
837	else if ( OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_v
838	\|\| OP_PARM_VSUBTYPE(pParam->fParam) == OP_PARM_z)
839	PUT_SZ_STRICT("strict dword ", "dword ");
840	}
841	PUT_NUM_32(pParam->uValue);
842	break;
843
844	case DISUSE_IMMEDIATE32_SX8:
845	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
846	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
847	PUT_SZ_STRICT("strict byte ", "byte ");
848	else
849	PUT_SZ("dword ");
850	PUT_NUM_32(pParam->uValue);
851	break;
852
853	case DISUSE_IMMEDIATE64_SX8:
854	if ( !(pDis->fPrefix & DISPREFIX_OPSIZE)
855	\|\| pDis->pCurInstr->uOpcode != OP_PUSH)
856	PUT_SZ_STRICT("strict byte ", "byte ");
857	else
858	PUT_SZ("qword ");
859	PUT_NUM_64(pParam->uValue);
860	break;
861
862	case DISUSE_IMMEDIATE64:
863	PUT_NUM_64(pParam->uValue);
864	break;
865
866	default:
867	AssertFailed();
868	break;
869	}
870	break;
871
872	case 'J': /* Relative jump offset (ParseImmBRel + ParseImmVRel). */
873	{
874	int32_t offDisplacement;
875	Assert(iParam == 1);
876	bool fPrefix = (fFlags & DIS_FMT_FLAGS_STRICT)
877	&& pOp->uOpcode != OP_CALL
878	&& pOp->uOpcode != OP_LOOP
879	&& pOp->uOpcode != OP_LOOPE
880	&& pOp->uOpcode != OP_LOOPNE
881	&& pOp->uOpcode != OP_JECXZ;
882	if (pOp->uOpcode == OP_CALL)
883	fFlags &= ~DIS_FMT_FLAGS_RELATIVE_BRANCH;
884
885	if (pParam->fUse & DISUSE_IMMEDIATE8_REL)
886	{
887	if (fPrefix)
888	PUT_SZ("short ");
889	offDisplacement = (int8_t)pParam->uValue;
890	Assert(*pszFmt == 'b'); pszFmt++;
891
892	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
893	PUT_NUM_S8(offDisplacement);
894	}
895	else if (pParam->fUse & DISUSE_IMMEDIATE16_REL)
896	{
897	if (fPrefix)
898	PUT_SZ("near ");
899	offDisplacement = (int16_t)pParam->uValue;
900	Assert(*pszFmt == 'v'); pszFmt++;
901
902	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
903	PUT_NUM_S16(offDisplacement);
904	}
905	else
906	{
907	if (fPrefix)
908	PUT_SZ("near ");
909	offDisplacement = (int32_t)pParam->uValue;
910	Assert(pParam->fUse & (DISUSE_IMMEDIATE32_REL\|DISUSE_IMMEDIATE64_REL));
911	Assert(*pszFmt == 'v'); pszFmt++;
912
913	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
914	PUT_NUM_S32(offDisplacement);
915	}
916	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
917	PUT_SZ(" (");
918
919	RTUINTPTR uTrgAddr = pDis->uInstrAddr + pDis->cbInstr + offDisplacement;
920	if (pDis->uCpuMode == DISCPUMODE_16BIT)
921	PUT_NUM_16(uTrgAddr);
922	else if (pDis->uCpuMode == DISCPUMODE_32BIT)
923	PUT_NUM_32(uTrgAddr);
924	else
925	PUT_NUM_64(uTrgAddr);
926
927	if (pfnGetSymbol)
928	{
929	int rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), uTrgAddr, szSymbol, sizeof(szSymbol), &off, pvUser);
930	if (RT_SUCCESS(rc))
931	{
932	PUT_SZ(" [");
933	PUT_PSZ(szSymbol);
934	if (off != 0)
935	{
936	if ((int8_t)off == off)
937	PUT_NUM_S8(off);
938	else if ((int16_t)off == off)
939	PUT_NUM_S16(off);
940	else if ((int32_t)off == off)
941	PUT_NUM_S32(off);
942	else
943	PUT_NUM_S64(off);
944	}
945	PUT_C(']');
946	}
947	}
948
949	if (fFlags & DIS_FMT_FLAGS_RELATIVE_BRANCH)
950	PUT_C(')');
951	break;
952	}
953
954	case 'A': /* Direct (jump/call) address (ParseImmAddr). */
955	{
956	Assert(*pszFmt == 'p'); pszFmt++;
957	PUT_FAR();
958	PUT_SIZE_OVERRIDE();
959	PUT_SEGMENT_OVERRIDE();
960	int rc = VERR_SYMBOL_NOT_FOUND;
961	switch (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16 \| DISUSE_IMMEDIATE_ADDR_16_32 \| DISUSE_DISPLACEMENT64 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT16))
962	{
963	case DISUSE_IMMEDIATE_ADDR_16_16:
964	PUT_NUM_16(pParam->uValue >> 16);
965	PUT_C(':');
966	PUT_NUM_16(pParam->uValue);
967	if (pfnGetSymbol)
968	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
969	break;
970	case DISUSE_IMMEDIATE_ADDR_16_32:
971	PUT_NUM_16(pParam->uValue >> 32);
972	PUT_C(':');
973	PUT_NUM_32(pParam->uValue);
974	if (pfnGetSymbol)
975	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
976	break;
977	case DISUSE_DISPLACEMENT16:
978	PUT_NUM_16(pParam->uValue);
979	if (pfnGetSymbol)
980	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
981	break;
982	case DISUSE_DISPLACEMENT32:
983	PUT_NUM_32(pParam->uValue);
984	if (pfnGetSymbol)
985	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
986	break;
987	case DISUSE_DISPLACEMENT64:
988	PUT_NUM_64(pParam->uValue);
989	if (pfnGetSymbol)
990	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), (uint64_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
991	break;
992	default:
993	AssertFailed();
994	break;
995	}
996
997	if (RT_SUCCESS(rc))
998	{
999	PUT_SZ(" [");
1000	PUT_PSZ(szSymbol);
1001	if (off != 0)
1002	{
1003	if ((int8_t)off == off)
1004	PUT_NUM_S8(off);
1005	else if ((int16_t)off == off)
1006	PUT_NUM_S16(off);
1007	else if ((int32_t)off == off)
1008	PUT_NUM_S32(off);
1009	else
1010	PUT_NUM_S64(off);
1011	}
1012	PUT_C(']');
1013	}
1014	break;
1015	}
1016
1017	case 'O': /* No ModRM byte (ParseImmAddr). */
1018	{
1019	Assert(pszFmt == 'b' \|\| pszFmt == 'v'); pszFmt++;
1020	PUT_FAR();
1021	PUT_SIZE_OVERRIDE();
1022	PUT_C('[');
1023	PUT_SEGMENT_OVERRIDE();
1024	int rc = VERR_SYMBOL_NOT_FOUND;
1025	switch (pParam->fUse & (DISUSE_IMMEDIATE_ADDR_16_16 \| DISUSE_IMMEDIATE_ADDR_16_32 \| DISUSE_DISPLACEMENT64 \| DISUSE_DISPLACEMENT32 \| DISUSE_DISPLACEMENT16))
1026	{
1027	case DISUSE_IMMEDIATE_ADDR_16_16:
1028	PUT_NUM_16(pParam->uValue >> 16);
1029	PUT_C(':');
1030	PUT_NUM_16(pParam->uValue);
1031	if (pfnGetSymbol)
1032	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint16_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1033	break;
1034	case DISUSE_IMMEDIATE_ADDR_16_32:
1035	PUT_NUM_16(pParam->uValue >> 32);
1036	PUT_C(':');
1037	PUT_NUM_32(pParam->uValue);
1038	if (pfnGetSymbol)
1039	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_VALUE(pParam->uValue >> 16), (uint32_t)pParam->uValue, szSymbol, sizeof(szSymbol), &off, pvUser);
1040	break;
1041	case DISUSE_DISPLACEMENT16:
1042	PUT_NUM_16(pParam->uDisp.i16);
1043	if (pfnGetSymbol)
1044	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u16, szSymbol, sizeof(szSymbol), &off, pvUser);
1045	break;
1046	case DISUSE_DISPLACEMENT32:
1047	PUT_NUM_32(pParam->uDisp.i32);
1048	if (pfnGetSymbol)
1049	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u32, szSymbol, sizeof(szSymbol), &off, pvUser);
1050	break;
1051	case DISUSE_DISPLACEMENT64:
1052	PUT_NUM_64(pParam->uDisp.i64);
1053	if (pfnGetSymbol)
1054	rc = pfnGetSymbol(pDis, DIS_FMT_SEL_FROM_REG(DISSELREG_CS), pParam->uDisp.u64, szSymbol, sizeof(szSymbol), &off, pvUser);
1055	break;
1056	default:
1057	AssertFailed();
1058	break;
1059	}
1060	PUT_C(']');
1061
1062	if (RT_SUCCESS(rc))
1063	{
1064	PUT_SZ(" (");
1065	PUT_PSZ(szSymbol);
1066	if (off != 0)
1067	{
1068	if ((int8_t)off == off)
1069	PUT_NUM_S8(off);
1070	else if ((int16_t)off == off)
1071	PUT_NUM_S16(off);
1072	else if ((int32_t)off == off)
1073	PUT_NUM_S32(off);
1074	else
1075	PUT_NUM_S64(off);
1076	}
1077	PUT_C(')');
1078	}
1079	break;
1080	}
1081
1082	case 'X': /* DS:SI (ParseXb, ParseXv). */
1083	case 'Y': /* ES:DI (ParseYb, ParseYv). */
1084	{
1085	Assert(pszFmt == 'b' \|\| pszFmt == 'v'); pszFmt++;
1086	PUT_FAR();
1087	PUT_SIZE_OVERRIDE();
1088	PUT_C('[');
1089	if (pParam->fUse & DISUSE_POINTER_DS_BASED)
1090	PUT_SZ("ds:");
1091	else
1092	PUT_SZ("es:");
1093
1094	size_t cchReg;
1095	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
1096	PUT_STR(pszReg, cchReg);
1097	PUT_C(']');
1098	break;
1099	}
1100
1101	case 'e': /* Register based on operand size (e.g. %eAX) (ParseFixedReg). */
1102	{
1103	Assert(RT_C_IS_ALPHA(pszFmt[0]) && RT_C_IS_ALPHA(pszFmt[1]) && !RT_C_IS_ALPHA(pszFmt[2])); pszFmt += 2;
1104	size_t cchReg;
1105	const char *pszReg = disasmFormatYasmBaseReg(pDis, pParam, &cchReg);
1106	PUT_STR(pszReg, cchReg);
1107	break;
1108	}
1109
1110	default:
1111	AssertMsgFailed(("%c%s!\n", ch, pszFmt));
1112	break;
1113	}
1114	AssertMsg(pszFmt == ',' \|\| pszFmt == '\0', ("%c%s\n", ch, pszFmt));
1115	}
1116	else
1117	{
1118	PUT_C(ch);
1119	if (ch == ',')
1120	{
1121	Assert(*pszFmt != ' ');
1122	PUT_C(' ');
1123	switch (++iParam)
1124	{
1125	case 2: pParam = &pDis->Param2; break;
1126	case 3: pParam = &pDis->Param3; break;
1127	default: pParam = NULL; break;
1128	}
1129	}
1130	}
1131	} /* while more to format */
1132	}
1133
1134	/*
1135	* Any additional output to the right of the instruction?
1136	*/
1137	if (fFlags & (DIS_FMT_FLAGS_BYTES_RIGHT \| DIS_FMT_FLAGS_ADDR_RIGHT))
1138	{
1139	/* some up front padding. */
1140	size_t cchPadding = cchOutput - offInstruction;
1141	cchPadding = cchPadding + 1 >= 42 ? 1 : 42 - cchPadding;
1142	PUT_STR(g_szSpaces, cchPadding);
1143
1144	/* comment? */
1145	if (fFlags & (DIS_FMT_FLAGS_BYTES_RIGHT \| DIS_FMT_FLAGS_ADDR_RIGHT))
1146	PUT_SZ(";");
1147
1148	/*
1149	* The address?
1150	*/
1151	if (fFlags & DIS_FMT_FLAGS_ADDR_RIGHT)
1152	{
1153	PUT_C(' ');
1154	#if HC_ARCH_BITS == 64 \|\| GC_ARCH_BITS == 64
1155	if (pDis->uInstrAddr >= _4G)
1156	PUT_NUM(9, "%08x`", (uint32_t)(pDis->uInstrAddr >> 32));
1157	#endif
1158	PUT_NUM(8, "%08x", (uint32_t)pDis->uInstrAddr);
1159	}
1160
1161	/*
1162	* Opcode bytes?
1163	*/
1164	if (fFlags & DIS_FMT_FLAGS_BYTES_RIGHT)
1165	{
1166	PUT_C(' ');
1167	size_t cchTmp = disFormatBytes(pDis, pszDst, cchDst, fFlags);
1168	cchOutput += cchTmp;
1169	if (cchTmp >= cchDst)
1170	cchTmp = cchDst - (cchDst != 0);
1171	cchDst -= cchTmp;
1172	pszDst += cchTmp;
1173	}
1174	}
1175
1176	/*
1177	* Terminate it - on overflow we'll have reserved one byte for this.
1178	*/
1179	if (cchDst > 0)
1180	*pszDst = '\0';
1181	else
1182	Assert(!cchBuf);
1183
1184	/* clean up macros */
1185	#undef PUT_PSZ
1186	#undef PUT_SZ
1187	#undef PUT_STR
1188	#undef PUT_C
1189	return cchOutput;
1190	}
1191
1192
1193	/**
1194	* Formats the current instruction in Yasm (/ Nasm) style.
1195	*
1196	* This is a simplified version of DISFormatYasmEx() provided for your convenience.
1197	*
1198	*
1199	* @returns The number of output characters. If this is >= cchBuf, then the content
1200	* of pszBuf will be truncated.
1201	* @param pDis Pointer to the disassembler state.
1202	* @param pszBuf The output buffer.
1203	* @param cchBuf The size of the output buffer.
1204	*/
1205	DISDECL(size_t) DISFormatYasm(PCDISSTATE pDis, char *pszBuf, size_t cchBuf)
1206	{
1207	return DISFormatYasmEx(pDis, pszBuf, cchBuf, 0 /* fFlags /, NULL / pfnGetSymbol /, NULL / pvUser */);
1208	}
1209
1210
1211	/**
1212	* Checks if the encoding of the given disassembled instruction is something we
1213	* can never get YASM to produce.
1214	*
1215	* @returns true if it's odd, false if it isn't.
1216	* @param pDis The disassembler output. The byte fetcher callback will
1217	* be used if present as we might need to fetch opcode
1218	* bytes.
1219	*/
1220	DISDECL(bool) DISFormatYasmIsOddEncoding(PDISSTATE pDis)
1221	{
1222	/*
1223	* Mod rm + SIB: Check for duplicate EBP encodings that yasm won't use for very good reasons.
1224	*/
1225	if ( pDis->uAddrMode != DISCPUMODE_16BIT ///@todo correct?
1226	&& pDis->ModRM.Bits.Rm == 4
1227	&& pDis->ModRM.Bits.Mod != 3)
1228	{
1229	/* No scaled index SIB (index=4), except for ESP. */
1230	if ( pDis->SIB.Bits.Index == 4
1231	&& pDis->SIB.Bits.Base != 4)
1232	return true;
1233
1234	/* EBP + displacement */
1235	if ( pDis->ModRM.Bits.Mod != 0
1236	&& pDis->SIB.Bits.Base == 5
1237	&& pDis->SIB.Bits.Scale == 0)
1238	return true;
1239	}
1240
1241	/*
1242	* Seems to be an instruction alias here, but I cannot find any docs on it... hrmpf!
1243	*/
1244	if ( pDis->pCurInstr->uOpcode == OP_SHL
1245	&& pDis->ModRM.Bits.Reg == 6)
1246	return true;
1247
1248	/*
1249	* Check for multiple prefixes of the same kind.
1250	*/
1251	uint8_t off1stSeg = UINT8_MAX;
1252	uint8_t offOpSize = UINT8_MAX;
1253	uint8_t offAddrSize = UINT8_MAX;
1254	uint32_t fPrefixes = 0;
1255	for (uint32_t offOpcode = 0; offOpcode < RT_ELEMENTS(pDis->abInstr); offOpcode++)
1256	{
1257	uint32_t f;
1258	switch (pDis->abInstr[offOpcode])
1259	{
1260	case 0xf0:
1261	f = DISPREFIX_LOCK;
1262	break;
1263
1264	case 0xf2:
1265	case 0xf3:
1266	f = DISPREFIX_REP; /* yes, both */
1267	break;
1268
1269	case 0x2e:
1270	case 0x3e:
1271	case 0x26:
1272	case 0x36:
1273	case 0x64:
1274	case 0x65:
1275	if (off1stSeg == UINT8_MAX)
1276	off1stSeg = offOpcode;
1277	f = DISPREFIX_SEG;
1278	break;
1279
1280	case 0x66:
1281	if (offOpSize == UINT8_MAX)
1282	offOpSize = offOpcode;
1283	f = DISPREFIX_OPSIZE;
1284	break;
1285
1286	case 0x67:
1287	if (offAddrSize == UINT8_MAX)
1288	offAddrSize = offOpcode;
1289	f = DISPREFIX_ADDRSIZE;
1290	break;
1291
1292	case 0x40: case 0x41: case 0x42: case 0x43: case 0x44: case 0x45: case 0x46: case 0x47:
1293	case 0x48: case 0x49: case 0x4a: case 0x4b: case 0x4c: case 0x4d: case 0x4e: case 0x4f:
1294	f = pDis->uCpuMode == DISCPUMODE_64BIT ? DISPREFIX_REX : 0;
1295	break;
1296
1297	default:
1298	f = 0;
1299	break;
1300	}
1301	if (!f)
1302	break; /* done */
1303	if (fPrefixes & f)
1304	return true;
1305	fPrefixes \|= f;
1306	}
1307
1308	/* segment overrides are fun */
1309	if (fPrefixes & DISPREFIX_SEG)
1310	{
1311	/* no effective address which it may apply to. */
1312	Assert((pDis->fPrefix & DISPREFIX_SEG) \|\| pDis->uCpuMode == DISCPUMODE_64BIT);
1313	if ( !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param1.fUse)
1314	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param2.fUse)
1315	&& !DISUSE_IS_EFFECTIVE_ADDR(pDis->Param3.fUse))
1316	return true;
1317
1318	/* Yasm puts the segment prefixes before the operand prefix with no
1319	way of overriding it. */
1320	if (offOpSize < off1stSeg)
1321	return true;
1322	}
1323
1324	/* fixed register + addr override doesn't go down all that well. */
1325	if (fPrefixes & DISPREFIX_ADDRSIZE)
1326	{
1327	Assert(pDis->fPrefix & DISPREFIX_ADDRSIZE);
1328	if ( pDis->pCurInstr->fParam3 == OP_PARM_NONE
1329	&& pDis->pCurInstr->fParam2 == OP_PARM_NONE
1330	&& ( pDis->pCurInstr->fParam1 >= OP_PARM_REG_GEN32_START
1331	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_GEN32_END))
1332	return true;
1333	}
1334
1335	/* Almost all prefixes are bad for jumps. */
1336	if (fPrefixes)
1337	{
1338	switch (pDis->pCurInstr->uOpcode)
1339	{
1340	/* nop w/ prefix(es). */
1341	case OP_NOP:
1342	return true;
1343
1344	case OP_JMP:
1345	if ( pDis->pCurInstr->fParam1 != OP_PARM_Jb
1346	&& pDis->pCurInstr->fParam1 != OP_PARM_Jv)
1347	break;
1348	/* fall thru */
1349	case OP_JO:
1350	case OP_JNO:
1351	case OP_JC:
1352	case OP_JNC:
1353	case OP_JE:
1354	case OP_JNE:
1355	case OP_JBE:
1356	case OP_JNBE:
1357	case OP_JS:
1358	case OP_JNS:
1359	case OP_JP:
1360	case OP_JNP:
1361	case OP_JL:
1362	case OP_JNL:
1363	case OP_JLE:
1364	case OP_JNLE:
1365	/** @todo branch hinting 0x2e/0x3e... */
1366	return true;
1367	}
1368
1369	}
1370
1371	/* All but the segment prefix is bad news for push/pop. */
1372	if (fPrefixes & ~DISPREFIX_SEG)
1373	{
1374	switch (pDis->pCurInstr->uOpcode)
1375	{
1376	case OP_POP:
1377	case OP_PUSH:
1378	if ( pDis->pCurInstr->fParam1 >= OP_PARM_REG_SEG_START
1379	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_SEG_END)
1380	return true;
1381	if ( (fPrefixes & ~DISPREFIX_OPSIZE)
1382	&& pDis->pCurInstr->fParam1 >= OP_PARM_REG_GEN32_START
1383	&& pDis->pCurInstr->fParam1 <= OP_PARM_REG_GEN32_END)
1384	return true;
1385	break;
1386
1387	case OP_POPA:
1388	case OP_POPF:
1389	case OP_PUSHA:
1390	case OP_PUSHF:
1391	if (fPrefixes & ~DISPREFIX_OPSIZE)
1392	return true;
1393	break;
1394	}
1395	}
1396
1397	/* Implicit 8-bit register instructions doesn't mix with operand size. */
1398	if ( (fPrefixes & DISPREFIX_OPSIZE)
1399	&& ( ( pDis->pCurInstr->fParam1 == OP_PARM_Gb /* r8 */
1400	&& pDis->pCurInstr->fParam2 == OP_PARM_Eb /* r8/mem8 */)
1401	\|\| ( pDis->pCurInstr->fParam2 == OP_PARM_Gb /* r8 */
1402	&& pDis->pCurInstr->fParam1 == OP_PARM_Eb /* r8/mem8 */))
1403	)
1404	{
1405	switch (pDis->pCurInstr->uOpcode)
1406	{
1407	case OP_ADD:
1408	case OP_OR:
1409	case OP_ADC:
1410	case OP_SBB:
1411	case OP_AND:
1412	case OP_SUB:
1413	case OP_XOR:
1414	case OP_CMP:
1415	return true;
1416	default:
1417	break;
1418	}
1419	}
1420
1421	/* Instructions taking no address or operand which thus may be annoyingly
1422	difficult to format for yasm. */
1423	if (fPrefixes)
1424	{
1425	switch (pDis->pCurInstr->uOpcode)
1426	{
1427	case OP_STI:
1428	case OP_STC:
1429	case OP_CLI:
1430	case OP_CLD:
1431	case OP_CLC:
1432	case OP_INT:
1433	case OP_INT3:
1434	case OP_INTO:
1435	case OP_HLT:
1436	/** @todo Many more to can be added here. */
1437	return true;
1438	default:
1439	break;
1440	}
1441	}
1442
1443	/* FPU and other instructions that ignores operand size override. */
1444	if (fPrefixes & DISPREFIX_OPSIZE)
1445	{
1446	switch (pDis->pCurInstr->uOpcode)
1447	{
1448	/* FPU: */
1449	case OP_FIADD:
1450	case OP_FIMUL:
1451	case OP_FISUB:
1452	case OP_FISUBR:
1453	case OP_FIDIV:
1454	case OP_FIDIVR:
1455	/** @todo there are many more. */
1456	return true;
1457
1458	case OP_MOV:
1459	/** @todo could be that we're not disassembling these correctly. */
1460	if (pDis->pCurInstr->fParam1 == OP_PARM_Sw)
1461	return true;
1462	/** @todo what about the other way? */
1463	break;
1464
1465	default:
1466	break;
1467	}
1468	}
1469
1470
1471	/*
1472	* Check for the version of xyz reg,reg instruction that the assembler doesn't use.
1473	*
1474	* For example:
1475	* expected: 1aee sbb ch, dh ; SBB r8, r/m8
1476	* yasm: 18F5 sbb ch, dh ; SBB r/m8, r8
1477	*/
1478	if (pDis->ModRM.Bits.Mod == 3 /* reg,reg */)
1479	{
1480	switch (pDis->pCurInstr->uOpcode)
1481	{
1482	case OP_ADD:
1483	case OP_OR:
1484	case OP_ADC:
1485	case OP_SBB:
1486	case OP_AND:
1487	case OP_SUB:
1488	case OP_XOR:
1489	case OP_CMP:
1490	if ( ( pDis->pCurInstr->fParam1 == OP_PARM_Gb /* r8 */
1491	&& pDis->pCurInstr->fParam2 == OP_PARM_Eb /* r8/mem8 */)
1492	\|\| ( pDis->pCurInstr->fParam1 == OP_PARM_Gv /* rX */
1493	&& pDis->pCurInstr->fParam2 == OP_PARM_Ev /* rX/memX */))
1494	return true;
1495
1496	/* 82 (see table A-6). */
1497	if (pDis->bOpCode == 0x82)
1498	return true;
1499	break;
1500
1501	/* ff /0, fe /0, ff /1, fe /0 */
1502	case OP_DEC:
1503	case OP_INC:
1504	return true;
1505
1506	case OP_POP:
1507	case OP_PUSH:
1508	Assert(pDis->bOpCode == 0x8f);
1509	return true;
1510
1511	case OP_MOV:
1512	if ( pDis->bOpCode == 0x8a
1513	\|\| pDis->bOpCode == 0x8b)
1514	return true;
1515	break;
1516
1517	default:
1518	break;
1519	}
1520	}
1521
1522	/* shl eax,1 will be assembled to the form without the immediate byte. */
1523	if ( pDis->pCurInstr->fParam2 == OP_PARM_Ib
1524	&& (uint8_t)pDis->Param2.uValue == 1)
1525	{
1526	switch (pDis->pCurInstr->uOpcode)
1527	{
1528	case OP_SHL:
1529	case OP_SHR:
1530	case OP_SAR:
1531	case OP_RCL:
1532	case OP_RCR:
1533	case OP_ROL:
1534	case OP_ROR:
1535	return true;
1536	}
1537	}
1538
1539	/* And some more - see table A-6. */
1540	if (pDis->bOpCode == 0x82)
1541	{
1542	switch (pDis->pCurInstr->uOpcode)
1543	{
1544	case OP_ADD:
1545	case OP_OR:
1546	case OP_ADC:
1547	case OP_SBB:
1548	case OP_AND:
1549	case OP_SUB:
1550	case OP_XOR:
1551	case OP_CMP:
1552	return true;
1553	break;
1554	}
1555	}
1556
1557
1558	/* check for REX.X = 1 without SIB. */
1559
1560	/* Yasm encodes setnbe al with /2 instead of /0 like the AMD manual
1561	says (intel doesn't appear to care). */
1562	switch (pDis->pCurInstr->uOpcode)
1563	{
1564	case OP_SETO:
1565	case OP_SETNO:
1566	case OP_SETC:
1567	case OP_SETNC:
1568	case OP_SETE:
1569	case OP_SETNE:
1570	case OP_SETBE:
1571	case OP_SETNBE:
1572	case OP_SETS:
1573	case OP_SETNS:
1574	case OP_SETP:
1575	case OP_SETNP:
1576	case OP_SETL:
1577	case OP_SETNL:
1578	case OP_SETLE:
1579	case OP_SETNLE:
1580	AssertMsg(pDis->bOpCode >= 0x90 && pDis->bOpCode <= 0x9f, ("%#x\n", pDis->bOpCode));
1581	if (pDis->ModRM.Bits.Reg != 2)
1582	return true;
1583	break;
1584	}
1585
1586	/*
1587	* The MOVZX reg32,mem16 instruction without an operand size prefix
1588	* doesn't quite make sense...
1589	*/
1590	if ( pDis->pCurInstr->uOpcode == OP_MOVZX
1591	&& pDis->bOpCode == 0xB7
1592	&& (pDis->uCpuMode == DISCPUMODE_16BIT) != !!(fPrefixes & DISPREFIX_OPSIZE))
1593	return true;
1594
1595	return false;
1596	}
1597

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source: vbox/trunk/src/VBox/Disassembler/DisasmFormatYasm.cpp@ 45674

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