VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMAll/IEMAllCImplStrInstr.cpp.h

Last change on this file was 106061, checked in by vboxsync, 2 months ago

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1/* $Id: IEMAllCImplStrInstr.cpp.h 106061 2024-09-16 14:03:52Z vboxsync $ */
2/** @file
3 * IEM - String Instruction Implementation Code Template.
4 */
5
6/*
7 * Copyright (C) 2011-2024 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * SPDX-License-Identifier: GPL-3.0-only
26 */
27
28
29/*******************************************************************************
30* Defined Constants And Macros *
31*******************************************************************************/
32#if OP_SIZE == 8
33# define OP_rAX al
34#elif OP_SIZE == 16
35# define OP_rAX ax
36#elif OP_SIZE == 32
37# define OP_rAX eax
38#elif OP_SIZE == 64
39# define OP_rAX rax
40#else
41# error "Bad OP_SIZE."
42#endif
43#define OP_TYPE RT_CONCAT3(uint,OP_SIZE,_t)
44
45#if ADDR_SIZE == 16
46# define ADDR_rDI di
47# define ADDR_rSI si
48# define ADDR_rCX cx
49# define ADDR2_TYPE uint32_t
50# define ADDR_VMXSTRIO 0
51#elif ADDR_SIZE == 32
52# define ADDR_rDI edi
53# define ADDR_rSI esi
54# define ADDR_rCX ecx
55# define ADDR2_TYPE uint32_t
56# define ADDR_VMXSTRIO 1
57#elif ADDR_SIZE == 64
58# define ADDR_rDI rdi
59# define ADDR_rSI rsi
60# define ADDR_rCX rcx
61# define ADDR2_TYPE uint64_t
62# define ADDR_VMXSTRIO 2
63# define IS_64_BIT_CODE(a_pVCpu) (true)
64#else
65# error "Bad ADDR_SIZE."
66#endif
67#define ADDR_TYPE RT_CONCAT3(uint,ADDR_SIZE,_t)
68
69#if ADDR_SIZE == 64 || OP_SIZE == 64
70# define IS_64_BIT_CODE(a_pVCpu) (true)
71#elif ADDR_SIZE == 32
72# define IS_64_BIT_CODE(a_pVCpu) IEM_IS_64BIT_CODE(a_pVCpu)
73#else
74# define IS_64_BIT_CODE(a_pVCpu) (false)
75#endif
76
77/** @def IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN
78 * Used in the outer (page-by-page) loop to check for reasons for returnning
79 * before completing the instruction. In raw-mode we temporarily enable
80 * interrupts to let the host interrupt us. We cannot let big string operations
81 * hog the CPU, especially not in raw-mode.
82 */
83#define IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(a_pVM, a_pVCpu, a_fEflags) \
84 do { \
85 if (RT_LIKELY( !VMCPU_FF_IS_ANY_SET(a_pVCpu, (a_fEflags) & X86_EFL_IF ? VMCPU_FF_YIELD_REPSTR_MASK \
86 : VMCPU_FF_YIELD_REPSTR_NOINT_MASK) \
87 && !VM_FF_IS_ANY_SET(a_pVM, VM_FF_YIELD_REPSTR_MASK) \
88 )) \
89 { /* probable */ } \
90 else \
91 { \
92 LogFlow(("%s: Leaving early (outer)! ffcpu=%#RX64 ffvm=%#x\n", \
93 __FUNCTION__, (uint64_t)(a_pVCpu)->fLocalForcedActions, (a_pVM)->fGlobalForcedActions)); \
94 return VINF_IEM_YIELD_PENDING_FF; \
95 } \
96 } while (0)
97
98/** @def IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN
99 * This is used in some of the inner loops to make sure we respond immediately
100 * to VMCPU_FF_IOM as well as outside requests. Use this for expensive
101 * instructions. Use IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN for
102 * ones that are typically cheap. */
103#define IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(a_pVM, a_pVCpu, a_fExitExpr) \
104 do { \
105 if (RT_LIKELY( ( !VMCPU_FF_IS_ANY_SET(a_pVCpu, VMCPU_FF_HIGH_PRIORITY_POST_REPSTR_MASK) \
106 && !VM_FF_IS_ANY_SET(a_pVM, VM_FF_HIGH_PRIORITY_POST_REPSTR_MASK)) \
107 || (a_fExitExpr) )) \
108 { /* very likely */ } \
109 else \
110 { \
111 LogFlow(("%s: Leaving early (inner)! ffcpu=%#RX64 ffvm=%#x\n", \
112 __FUNCTION__, (uint64_t)(a_pVCpu)->fLocalForcedActions, (a_pVM)->fGlobalForcedActions)); \
113 return VINF_IEM_YIELD_PENDING_FF; \
114 } \
115 } while (0)
116
117
118/** @def IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN
119 * This is used in the inner loops where
120 * IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN isn't used. It only
121 * checks the CPU FFs so that we respond immediately to the pending IOM FF
122 * (status code is hidden in IEMCPU::rcPassUp by IEM memory commit code).
123 */
124#define IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(a_pVM, a_pVCpu, a_fExitExpr) \
125 do { \
126 if (RT_LIKELY( !VMCPU_FF_IS_ANY_SET(a_pVCpu, VMCPU_FF_HIGH_PRIORITY_POST_REPSTR_MASK) \
127 || (a_fExitExpr) )) \
128 { /* very likely */ } \
129 else \
130 { \
131 LogFlow(("%s: Leaving early (inner)! ffcpu=%#RX64 (ffvm=%#x)\n", \
132 __FUNCTION__, (uint64_t)(a_pVCpu)->fLocalForcedActions, (a_pVM)->fGlobalForcedActions)); \
133 return VINF_IEM_YIELD_PENDING_FF; \
134 } \
135 } while (0)
136
137
138/**
139 * Implements 'REPE CMPS'.
140 */
141IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_repe_cmps_op,OP_SIZE,_addr,ADDR_SIZE), uint8_t, iEffSeg)
142{
143 PVM pVM = pVCpu->CTX_SUFF(pVM);
144
145 /*
146 * Setup.
147 */
148 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
149 if (uCounterReg == 0)
150 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
151
152 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_SREG_FROM_IDX(iEffSeg) | CPUMCTX_EXTRN_ES);
153
154 PCCPUMSELREGHID pSrc1Hid = iemSRegGetHid(pVCpu, iEffSeg);
155 uint64_t uSrc1Base = 0; /* gcc may not be used uninitialized */
156 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, pSrc1Hid, iEffSeg, &uSrc1Base);
157 if (rcStrict != VINF_SUCCESS)
158 return rcStrict;
159
160 uint64_t uSrc2Base = 0; /* gcc may not be used uninitialized */
161 rcStrict = iemMemSegCheckReadAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uSrc2Base);
162 if (rcStrict != VINF_SUCCESS)
163 return rcStrict;
164
165 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
166 ADDR_TYPE uSrc1AddrReg = pVCpu->cpum.GstCtx.ADDR_rSI;
167 ADDR_TYPE uSrc2AddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
168 uint32_t uEFlags = pVCpu->cpum.GstCtx.eflags.u;
169
170 /*
171 * The loop.
172 */
173 for (;;)
174 {
175 /*
176 * Do segmentation and virtual page stuff.
177 */
178 ADDR2_TYPE uVirtSrc1Addr = uSrc1AddrReg + (ADDR2_TYPE)uSrc1Base;
179 ADDR2_TYPE uVirtSrc2Addr = uSrc2AddrReg + (ADDR2_TYPE)uSrc2Base;
180 uint32_t cLeftSrc1Page = (GUEST_PAGE_SIZE - (uVirtSrc1Addr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
181 if (cLeftSrc1Page > uCounterReg)
182 cLeftSrc1Page = uCounterReg;
183 uint32_t cLeftSrc2Page = (GUEST_PAGE_SIZE - (uVirtSrc2Addr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
184 uint32_t cLeftPage = RT_MIN(cLeftSrc1Page, cLeftSrc2Page);
185
186 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
187 && cbIncr > 0 /** @todo Optimize reverse direction string ops. */
188 && ( IS_64_BIT_CODE(pVCpu)
189 || ( uSrc1AddrReg < pSrc1Hid->u32Limit
190 && uSrc1AddrReg + (cLeftPage * (OP_SIZE / 8)) <= pSrc1Hid->u32Limit
191 && uSrc2AddrReg < pVCpu->cpum.GstCtx.es.u32Limit
192 && uSrc2AddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
193 )
194 )
195 {
196 RTGCPHYS GCPhysSrc1Mem;
197 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtSrc1Addr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysSrc1Mem);
198 if (rcStrict != VINF_SUCCESS)
199 return rcStrict;
200
201 RTGCPHYS GCPhysSrc2Mem;
202 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtSrc2Addr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysSrc2Mem);
203 if (rcStrict != VINF_SUCCESS)
204 return rcStrict;
205
206 /*
207 * If we can map the page without trouble, do a block processing
208 * until the end of the current page.
209 */
210 PGMPAGEMAPLOCK PgLockSrc2Mem;
211 OP_TYPE const *puSrc2Mem;
212 rcStrict = iemMemPageMap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, (void **)&puSrc2Mem, &PgLockSrc2Mem);
213 if (rcStrict == VINF_SUCCESS)
214 {
215 PGMPAGEMAPLOCK PgLockSrc1Mem;
216 OP_TYPE const *puSrc1Mem;
217 rcStrict = iemMemPageMap(pVCpu, GCPhysSrc1Mem, IEM_ACCESS_DATA_R, (void **)&puSrc1Mem, &PgLockSrc1Mem);
218 if (rcStrict == VINF_SUCCESS)
219 {
220 if (!memcmp(puSrc2Mem, puSrc1Mem, cLeftPage * (OP_SIZE / 8)))
221 {
222 /* All matches, only compare the last itme to get the right eflags. */
223 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&puSrc1Mem[cLeftPage-1], puSrc2Mem[cLeftPage-1]);
224 uSrc1AddrReg += cLeftPage * cbIncr;
225 uSrc2AddrReg += cLeftPage * cbIncr;
226 uCounterReg -= cLeftPage;
227 }
228 else
229 {
230 /* Some mismatch, compare each item (and keep volatile
231 memory in mind). */
232 uint32_t off = 0;
233 do
234 {
235 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&puSrc1Mem[off], puSrc2Mem[off]);
236 off++;
237 } while ( off < cLeftPage
238 && (uEFlags & X86_EFL_ZF));
239 uSrc1AddrReg += cbIncr * off;
240 uSrc2AddrReg += cbIncr * off;
241 uCounterReg -= off;
242 }
243
244 /* Update the registers before looping. */
245 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg;
246 pVCpu->cpum.GstCtx.ADDR_rSI = uSrc1AddrReg;
247 pVCpu->cpum.GstCtx.ADDR_rDI = uSrc2AddrReg;
248 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
249
250 iemMemPageUnmap(pVCpu, GCPhysSrc1Mem, IEM_ACCESS_DATA_R, puSrc1Mem, &PgLockSrc1Mem);
251 iemMemPageUnmap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, puSrc2Mem, &PgLockSrc2Mem);
252 if ( uCounterReg == 0
253 || !(uEFlags & X86_EFL_ZF))
254 break;
255 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
256 continue;
257 }
258 iemMemPageUnmap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, puSrc2Mem, &PgLockSrc2Mem);
259 }
260 }
261
262 /*
263 * Fallback - slow processing till the end of the current page.
264 * In the cross page boundrary case we will end up here with cLeftPage
265 * as 0, we execute one loop then.
266 */
267 do
268 {
269 OP_TYPE uValue1;
270 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue1, iEffSeg, uSrc1AddrReg);
271 if (rcStrict != VINF_SUCCESS)
272 return rcStrict;
273 OP_TYPE uValue2;
274 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue2, X86_SREG_ES, uSrc2AddrReg);
275 if (rcStrict != VINF_SUCCESS)
276 return rcStrict;
277 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, &uValue1, uValue2);
278
279 pVCpu->cpum.GstCtx.ADDR_rSI = uSrc1AddrReg += cbIncr;
280 pVCpu->cpum.GstCtx.ADDR_rDI = uSrc2AddrReg += cbIncr;
281 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
282 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
283 cLeftPage--;
284 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0 || !(uEFlags & X86_EFL_ZF));
285 } while ( (int32_t)cLeftPage > 0
286 && (uEFlags & X86_EFL_ZF));
287
288 /*
289 * Next page? Must check for interrupts and stuff here.
290 */
291 if ( uCounterReg == 0
292 || !(uEFlags & X86_EFL_ZF))
293 break;
294 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
295 }
296
297 /*
298 * Done.
299 */
300 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
301}
302
303
304/**
305 * Implements 'REPNE CMPS'.
306 */
307IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_repne_cmps_op,OP_SIZE,_addr,ADDR_SIZE), uint8_t, iEffSeg)
308{
309 PVM pVM = pVCpu->CTX_SUFF(pVM);
310
311 /*
312 * Setup.
313 */
314 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
315 if (uCounterReg == 0)
316 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
317
318 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_SREG_FROM_IDX(iEffSeg) | CPUMCTX_EXTRN_ES);
319
320 PCCPUMSELREGHID pSrc1Hid = iemSRegGetHid(pVCpu, iEffSeg);
321 uint64_t uSrc1Base = 0; /* gcc may not be used uninitialized */;
322 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, pSrc1Hid, iEffSeg, &uSrc1Base);
323 if (rcStrict != VINF_SUCCESS)
324 return rcStrict;
325
326 uint64_t uSrc2Base = 0; /* gcc may not be used uninitialized */
327 rcStrict = iemMemSegCheckReadAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uSrc2Base);
328 if (rcStrict != VINF_SUCCESS)
329 return rcStrict;
330
331 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
332 ADDR_TYPE uSrc1AddrReg = pVCpu->cpum.GstCtx.ADDR_rSI;
333 ADDR_TYPE uSrc2AddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
334 uint32_t uEFlags = pVCpu->cpum.GstCtx.eflags.u;
335
336 /*
337 * The loop.
338 */
339 for (;;)
340 {
341 /*
342 * Do segmentation and virtual page stuff.
343 */
344 ADDR2_TYPE uVirtSrc1Addr = uSrc1AddrReg + (ADDR2_TYPE)uSrc1Base;
345 ADDR2_TYPE uVirtSrc2Addr = uSrc2AddrReg + (ADDR2_TYPE)uSrc2Base;
346 uint32_t cLeftSrc1Page = (GUEST_PAGE_SIZE - (uVirtSrc1Addr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
347 if (cLeftSrc1Page > uCounterReg)
348 cLeftSrc1Page = uCounterReg;
349 uint32_t cLeftSrc2Page = (GUEST_PAGE_SIZE - (uVirtSrc2Addr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
350 uint32_t cLeftPage = RT_MIN(cLeftSrc1Page, cLeftSrc2Page);
351
352 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
353 && cbIncr > 0 /** @todo Optimize reverse direction string ops. */
354 && ( IS_64_BIT_CODE(pVCpu)
355 || ( uSrc1AddrReg < pSrc1Hid->u32Limit
356 && uSrc1AddrReg + (cLeftPage * (OP_SIZE / 8)) <= pSrc1Hid->u32Limit
357 && uSrc2AddrReg < pVCpu->cpum.GstCtx.es.u32Limit
358 && uSrc2AddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
359 )
360 )
361 {
362 RTGCPHYS GCPhysSrc1Mem;
363 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtSrc1Addr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysSrc1Mem);
364 if (rcStrict != VINF_SUCCESS)
365 return rcStrict;
366
367 RTGCPHYS GCPhysSrc2Mem;
368 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtSrc2Addr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysSrc2Mem);
369 if (rcStrict != VINF_SUCCESS)
370 return rcStrict;
371
372 /*
373 * If we can map the page without trouble, do a block processing
374 * until the end of the current page.
375 */
376 OP_TYPE const *puSrc2Mem;
377 PGMPAGEMAPLOCK PgLockSrc2Mem;
378 rcStrict = iemMemPageMap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, (void **)&puSrc2Mem, &PgLockSrc2Mem);
379 if (rcStrict == VINF_SUCCESS)
380 {
381 OP_TYPE const *puSrc1Mem;
382 PGMPAGEMAPLOCK PgLockSrc1Mem;
383 rcStrict = iemMemPageMap(pVCpu, GCPhysSrc1Mem, IEM_ACCESS_DATA_R, (void **)&puSrc1Mem, &PgLockSrc1Mem);
384 if (rcStrict == VINF_SUCCESS)
385 {
386 if (memcmp(puSrc2Mem, puSrc1Mem, cLeftPage * (OP_SIZE / 8)))
387 {
388 /* All matches, only compare the last item to get the right eflags. */
389 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&puSrc1Mem[cLeftPage-1], puSrc2Mem[cLeftPage-1]);
390 uSrc1AddrReg += cLeftPage * cbIncr;
391 uSrc2AddrReg += cLeftPage * cbIncr;
392 uCounterReg -= cLeftPage;
393 }
394 else
395 {
396 /* Some mismatch, compare each item (and keep volatile
397 memory in mind). */
398 uint32_t off = 0;
399 do
400 {
401 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&puSrc1Mem[off], puSrc2Mem[off]);
402 off++;
403 } while ( off < cLeftPage
404 && !(uEFlags & X86_EFL_ZF));
405 uSrc1AddrReg += cbIncr * off;
406 uSrc2AddrReg += cbIncr * off;
407 uCounterReg -= off;
408 }
409
410 /* Update the registers before looping. */
411 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg;
412 pVCpu->cpum.GstCtx.ADDR_rSI = uSrc1AddrReg;
413 pVCpu->cpum.GstCtx.ADDR_rDI = uSrc2AddrReg;
414 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
415
416 iemMemPageUnmap(pVCpu, GCPhysSrc1Mem, IEM_ACCESS_DATA_R, puSrc1Mem, &PgLockSrc1Mem);
417 iemMemPageUnmap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, puSrc2Mem, &PgLockSrc2Mem);
418 if ( uCounterReg == 0
419 || (uEFlags & X86_EFL_ZF))
420 break;
421 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
422 continue;
423 }
424 iemMemPageUnmap(pVCpu, GCPhysSrc2Mem, IEM_ACCESS_DATA_R, puSrc2Mem, &PgLockSrc2Mem);
425 }
426 }
427
428 /*
429 * Fallback - slow processing till the end of the current page.
430 * In the cross page boundrary case we will end up here with cLeftPage
431 * as 0, we execute one loop then.
432 */
433 do
434 {
435 OP_TYPE uValue1;
436 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue1, iEffSeg, uSrc1AddrReg);
437 if (rcStrict != VINF_SUCCESS)
438 return rcStrict;
439 OP_TYPE uValue2;
440 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue2, X86_SREG_ES, uSrc2AddrReg);
441 if (rcStrict != VINF_SUCCESS)
442 return rcStrict;
443 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, &uValue1, uValue2);
444
445 pVCpu->cpum.GstCtx.ADDR_rSI = uSrc1AddrReg += cbIncr;
446 pVCpu->cpum.GstCtx.ADDR_rDI = uSrc2AddrReg += cbIncr;
447 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
448 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
449 cLeftPage--;
450 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0 || (uEFlags & X86_EFL_ZF));
451 } while ( (int32_t)cLeftPage > 0
452 && !(uEFlags & X86_EFL_ZF));
453
454 /*
455 * Next page? Must check for interrupts and stuff here.
456 */
457 if ( uCounterReg == 0
458 || (uEFlags & X86_EFL_ZF))
459 break;
460 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
461 }
462
463 /*
464 * Done.
465 */
466 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
467}
468
469
470/**
471 * Implements 'REPE SCAS'.
472 */
473IEM_CIMPL_DEF_0(RT_CONCAT4(iemCImpl_repe_scas_,OP_rAX,_m,ADDR_SIZE))
474{
475 PVM pVM = pVCpu->CTX_SUFF(pVM);
476
477 /*
478 * Setup.
479 */
480 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
481 if (uCounterReg == 0)
482 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
483
484 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_ES);
485 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
486 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uBaseAddr);
487 if (rcStrict != VINF_SUCCESS)
488 return rcStrict;
489
490 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
491 OP_TYPE const uValueReg = pVCpu->cpum.GstCtx.OP_rAX;
492 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
493 uint32_t uEFlags = pVCpu->cpum.GstCtx.eflags.u;
494
495 /*
496 * The loop.
497 */
498 for (;;)
499 {
500 /*
501 * Do segmentation and virtual page stuff.
502 */
503 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
504 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
505 if (cLeftPage > uCounterReg)
506 cLeftPage = uCounterReg;
507 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
508 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
509 && ( IS_64_BIT_CODE(pVCpu)
510 || ( uAddrReg < pVCpu->cpum.GstCtx.es.u32Limit
511 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
512 )
513 )
514 {
515 RTGCPHYS GCPhysMem;
516 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysMem);
517 if (rcStrict != VINF_SUCCESS)
518 return rcStrict;
519
520 /*
521 * If we can map the page without trouble, do a block processing
522 * until the end of the current page.
523 */
524 PGMPAGEMAPLOCK PgLockMem;
525 OP_TYPE const *puMem;
526 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, (void **)&puMem, &PgLockMem);
527 if (rcStrict == VINF_SUCCESS)
528 {
529 /* Search till we find a mismatching item. */
530 OP_TYPE uTmpValue;
531 bool fQuit;
532 uint32_t i = 0;
533 do
534 {
535 uTmpValue = puMem[i++];
536 fQuit = uTmpValue != uValueReg;
537 } while (i < cLeftPage && !fQuit);
538
539 /* Update the regs. */
540 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&uValueReg, uTmpValue);
541 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= i;
542 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += i * cbIncr;
543 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
544 Assert(!(uEFlags & X86_EFL_ZF) == fQuit);
545 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, puMem, &PgLockMem);
546 if ( fQuit
547 || uCounterReg == 0)
548 break;
549
550 /* If unaligned, we drop thru and do the page crossing access
551 below. Otherwise, do the next page. */
552 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
553 {
554 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
555 continue;
556 }
557 cLeftPage = 0;
558 }
559 }
560
561 /*
562 * Fallback - slow processing till the end of the current page.
563 * In the cross page boundrary case we will end up here with cLeftPage
564 * as 0, we execute one loop then.
565 */
566 do
567 {
568 OP_TYPE uTmpValue;
569 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uTmpValue, X86_SREG_ES, uAddrReg);
570 if (rcStrict != VINF_SUCCESS)
571 return rcStrict;
572 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&uValueReg, uTmpValue);
573
574 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cbIncr;
575 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
576 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
577 cLeftPage--;
578 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0 || !(uEFlags & X86_EFL_ZF));
579 } while ( (int32_t)cLeftPage > 0
580 && (uEFlags & X86_EFL_ZF));
581
582 /*
583 * Next page? Must check for interrupts and stuff here.
584 */
585 if ( uCounterReg == 0
586 || !(uEFlags & X86_EFL_ZF))
587 break;
588 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
589 }
590
591 /*
592 * Done.
593 */
594 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
595}
596
597
598/**
599 * Implements 'REPNE SCAS'.
600 */
601IEM_CIMPL_DEF_0(RT_CONCAT4(iemCImpl_repne_scas_,OP_rAX,_m,ADDR_SIZE))
602{
603 PVM pVM = pVCpu->CTX_SUFF(pVM);
604
605 /*
606 * Setup.
607 */
608 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
609 if (uCounterReg == 0)
610 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
611
612 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_ES);
613 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
614 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uBaseAddr);
615 if (rcStrict != VINF_SUCCESS)
616 return rcStrict;
617
618 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
619 OP_TYPE const uValueReg = pVCpu->cpum.GstCtx.OP_rAX;
620 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
621 uint32_t uEFlags = pVCpu->cpum.GstCtx.eflags.u;
622
623 /*
624 * The loop.
625 */
626 for (;;)
627 {
628 /*
629 * Do segmentation and virtual page stuff.
630 */
631 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
632 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
633 if (cLeftPage > uCounterReg)
634 cLeftPage = uCounterReg;
635 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
636 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
637 && ( IS_64_BIT_CODE(pVCpu)
638 || ( uAddrReg < pVCpu->cpum.GstCtx.es.u32Limit
639 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
640 )
641 )
642 {
643 RTGCPHYS GCPhysMem;
644 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysMem);
645 if (rcStrict != VINF_SUCCESS)
646 return rcStrict;
647
648 /*
649 * If we can map the page without trouble, do a block processing
650 * until the end of the current page.
651 */
652 PGMPAGEMAPLOCK PgLockMem;
653 OP_TYPE const *puMem;
654 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, (void **)&puMem, &PgLockMem);
655 if (rcStrict == VINF_SUCCESS)
656 {
657 /* Search till we find a mismatching item. */
658 OP_TYPE uTmpValue;
659 bool fQuit;
660 uint32_t i = 0;
661 do
662 {
663 uTmpValue = puMem[i++];
664 fQuit = uTmpValue == uValueReg;
665 } while (i < cLeftPage && !fQuit);
666
667 /* Update the regs. */
668 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&uValueReg, uTmpValue);
669 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= i;
670 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += i * cbIncr;
671 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
672 Assert(!!(uEFlags & X86_EFL_ZF) == fQuit);
673 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, puMem, &PgLockMem);
674 if ( fQuit
675 || uCounterReg == 0)
676 break;
677
678 /* If unaligned, we drop thru and do the page crossing access
679 below. Otherwise, do the next page. */
680 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
681 {
682 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
683 continue;
684 }
685 cLeftPage = 0;
686 }
687 }
688
689 /*
690 * Fallback - slow processing till the end of the current page.
691 * In the cross page boundrary case we will end up here with cLeftPage
692 * as 0, we execute one loop then.
693 */
694 do
695 {
696 OP_TYPE uTmpValue;
697 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uTmpValue, X86_SREG_ES, uAddrReg);
698 if (rcStrict != VINF_SUCCESS)
699 return rcStrict;
700 uEFlags = RT_CONCAT(iemAImpl_cmp_u,OP_SIZE)(uEFlags, (OP_TYPE *)&uValueReg, uTmpValue);
701 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cbIncr;
702 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
703 pVCpu->cpum.GstCtx.eflags.u = uEFlags;
704 cLeftPage--;
705 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0 || (uEFlags & X86_EFL_ZF));
706 } while ( (int32_t)cLeftPage > 0
707 && !(uEFlags & X86_EFL_ZF));
708
709 /*
710 * Next page? Must check for interrupts and stuff here.
711 */
712 if ( uCounterReg == 0
713 || (uEFlags & X86_EFL_ZF))
714 break;
715 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, uEFlags);
716 }
717
718 /*
719 * Done.
720 */
721 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
722}
723
724
725
726
727/**
728 * Implements 'REP MOVS'.
729 */
730IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_rep_movs_op,OP_SIZE,_addr,ADDR_SIZE), uint8_t, iEffSeg)
731{
732 PVM pVM = pVCpu->CTX_SUFF(pVM);
733
734 /*
735 * Setup.
736 */
737 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
738 if (uCounterReg == 0)
739 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
740
741 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_SREG_FROM_IDX(iEffSeg) | CPUMCTX_EXTRN_ES);
742
743 PCCPUMSELREGHID pSrcHid = iemSRegGetHid(pVCpu, iEffSeg);
744 uint64_t uSrcBase = 0; /* gcc may not be used uninitialized */
745 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, pSrcHid, iEffSeg, &uSrcBase);
746 if (rcStrict != VINF_SUCCESS)
747 return rcStrict;
748
749 uint64_t uDstBase = 0; /* gcc may not be used uninitialized */
750 rcStrict = iemMemSegCheckWriteAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uDstBase);
751 if (rcStrict != VINF_SUCCESS)
752 return rcStrict;
753
754 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
755 ADDR_TYPE uSrcAddrReg = pVCpu->cpum.GstCtx.ADDR_rSI;
756 ADDR_TYPE uDstAddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
757
758 /*
759 * Be careful with handle bypassing.
760 */
761 if (pVCpu->iem.s.fExec & IEM_F_BYPASS_HANDLERS)
762 {
763 Log(("%s: declining because we're bypassing handlers\n", __FUNCTION__));
764 return VERR_IEM_ASPECT_NOT_IMPLEMENTED;
765 }
766
767 /*
768 * The loop.
769 */
770 for (;;)
771 {
772 /*
773 * Do segmentation and virtual page stuff.
774 */
775 ADDR2_TYPE uVirtSrcAddr = uSrcAddrReg + (ADDR2_TYPE)uSrcBase;
776 ADDR2_TYPE uVirtDstAddr = uDstAddrReg + (ADDR2_TYPE)uDstBase;
777 uint32_t cLeftSrcPage = (GUEST_PAGE_SIZE - (uVirtSrcAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
778 if (cLeftSrcPage > uCounterReg)
779 cLeftSrcPage = uCounterReg;
780 uint32_t cLeftDstPage = (GUEST_PAGE_SIZE - (uVirtDstAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
781 uint32_t cLeftPage = RT_MIN(cLeftSrcPage, cLeftDstPage);
782
783 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
784 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
785 && ( IS_64_BIT_CODE(pVCpu)
786 || ( uSrcAddrReg < pSrcHid->u32Limit
787 && uSrcAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pSrcHid->u32Limit
788 && uDstAddrReg < pVCpu->cpum.GstCtx.es.u32Limit
789 && uDstAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
790 )
791 )
792 {
793 RTGCPHYS GCPhysSrcMem;
794 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtSrcAddr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysSrcMem);
795 if (rcStrict != VINF_SUCCESS)
796 return rcStrict;
797
798 RTGCPHYS GCPhysDstMem;
799 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtDstAddr, OP_SIZE / 8, IEM_ACCESS_DATA_W, &GCPhysDstMem);
800 if (rcStrict != VINF_SUCCESS)
801 return rcStrict;
802
803 /*
804 * If we can map the page without trouble, do a block processing
805 * until the end of the current page.
806 */
807 PGMPAGEMAPLOCK PgLockDstMem;
808 OP_TYPE *puDstMem;
809 rcStrict = iemMemPageMap(pVCpu, GCPhysDstMem, IEM_ACCESS_DATA_W, (void **)&puDstMem, &PgLockDstMem);
810 if (rcStrict == VINF_SUCCESS)
811 {
812 PGMPAGEMAPLOCK PgLockSrcMem;
813 OP_TYPE const *puSrcMem;
814 rcStrict = iemMemPageMap(pVCpu, GCPhysSrcMem, IEM_ACCESS_DATA_R, (void **)&puSrcMem, &PgLockSrcMem);
815 if (rcStrict == VINF_SUCCESS)
816 {
817 Assert( (GCPhysSrcMem >> GUEST_PAGE_SHIFT) != (GCPhysDstMem >> GUEST_PAGE_SHIFT)
818 || ((uintptr_t)puSrcMem >> GUEST_PAGE_SHIFT) == ((uintptr_t)puDstMem >> GUEST_PAGE_SHIFT));
819
820 /* Perform the operation exactly (don't use memcpy to avoid
821 having to consider how its implementation would affect
822 any overlapping source and destination area). */
823 OP_TYPE const *puSrcCur = puSrcMem;
824 OP_TYPE *puDstCur = puDstMem;
825 uint32_t cTodo = cLeftPage;
826 while (cTodo-- > 0)
827 *puDstCur++ = *puSrcCur++;
828
829 /* Update the registers. */
830 pVCpu->cpum.GstCtx.ADDR_rSI = uSrcAddrReg += cLeftPage * cbIncr;
831 pVCpu->cpum.GstCtx.ADDR_rDI = uDstAddrReg += cLeftPage * cbIncr;
832 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cLeftPage;
833
834 iemMemPageUnmap(pVCpu, GCPhysSrcMem, IEM_ACCESS_DATA_R, puSrcMem, &PgLockSrcMem);
835 iemMemPageUnmap(pVCpu, GCPhysDstMem, IEM_ACCESS_DATA_W, puDstMem, &PgLockDstMem);
836
837 if (uCounterReg == 0)
838 break;
839 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
840 continue;
841 }
842 iemMemPageUnmap(pVCpu, GCPhysDstMem, IEM_ACCESS_DATA_W, puDstMem, &PgLockDstMem);
843 }
844 }
845
846 /*
847 * Fallback - slow processing till the end of the current page.
848 * In the cross page boundrary case we will end up here with cLeftPage
849 * as 0, we execute one loop then.
850 */
851 do
852 {
853 OP_TYPE uValue;
854 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue, iEffSeg, uSrcAddrReg);
855 if (rcStrict != VINF_SUCCESS)
856 return rcStrict;
857 rcStrict = RT_CONCAT(iemMemStoreDataU,OP_SIZE)(pVCpu, X86_SREG_ES, uDstAddrReg, uValue);
858 if (rcStrict != VINF_SUCCESS)
859 return rcStrict;
860
861 pVCpu->cpum.GstCtx.ADDR_rSI = uSrcAddrReg += cbIncr;
862 pVCpu->cpum.GstCtx.ADDR_rDI = uDstAddrReg += cbIncr;
863 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
864 cLeftPage--;
865 IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0);
866 } while ((int32_t)cLeftPage > 0);
867
868 /*
869 * Next page. Must check for interrupts and stuff here.
870 */
871 if (uCounterReg == 0)
872 break;
873 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
874 }
875
876 /*
877 * Done.
878 */
879 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
880}
881
882
883/**
884 * Implements 'REP STOS'.
885 */
886IEM_CIMPL_DEF_0(RT_CONCAT4(iemCImpl_stos_,OP_rAX,_m,ADDR_SIZE))
887{
888 PVM pVM = pVCpu->CTX_SUFF(pVM);
889
890 /*
891 * Setup.
892 */
893 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
894 if (uCounterReg == 0)
895 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
896
897 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_ES);
898
899 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
900 VBOXSTRICTRC rcStrict = iemMemSegCheckWriteAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uBaseAddr);
901 if (rcStrict != VINF_SUCCESS)
902 return rcStrict;
903
904 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
905 OP_TYPE const uValue = pVCpu->cpum.GstCtx.OP_rAX;
906 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
907
908 /*
909 * Be careful with handle bypassing.
910 */
911 /** @todo Permit doing a page if correctly aligned. */
912 if (pVCpu->iem.s.fExec & IEM_F_BYPASS_HANDLERS)
913 {
914 Log(("%s: declining because we're bypassing handlers\n", __FUNCTION__));
915 return VERR_IEM_ASPECT_NOT_IMPLEMENTED;
916 }
917
918 /*
919 * The loop.
920 */
921 for (;;)
922 {
923 /*
924 * Do segmentation and virtual page stuff.
925 */
926 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
927 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
928 if (cLeftPage > uCounterReg)
929 cLeftPage = uCounterReg;
930 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
931 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
932 && ( IS_64_BIT_CODE(pVCpu)
933 || ( uAddrReg < pVCpu->cpum.GstCtx.es.u32Limit
934 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
935 )
936 )
937 {
938 RTGCPHYS GCPhysMem;
939 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_W, &GCPhysMem);
940 if (rcStrict != VINF_SUCCESS)
941 return rcStrict;
942
943 /*
944 * If we can map the page without trouble, do a block processing
945 * until the end of the current page.
946 */
947 PGMPAGEMAPLOCK PgLockMem;
948 OP_TYPE *puMem;
949 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_W, (void **)&puMem, &PgLockMem);
950 if (rcStrict == VINF_SUCCESS)
951 {
952 /* Update the regs first so we can loop on cLeftPage. */
953 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cLeftPage;
954 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cLeftPage * cbIncr;
955
956 /* Do the memsetting. */
957#if OP_SIZE == 8
958 memset(puMem, uValue, cLeftPage);
959/*#elif OP_SIZE == 32
960 ASMMemFill32(puMem, cLeftPage * (OP_SIZE / 8), uValue);*/
961#else
962 while (cLeftPage-- > 0)
963 *puMem++ = uValue;
964#endif
965
966 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_W, puMem, &PgLockMem);
967
968 if (uCounterReg == 0)
969 break;
970
971 /* If unaligned, we drop thru and do the page crossing access
972 below. Otherwise, do the next page. */
973 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
974 {
975 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
976 continue;
977 }
978 cLeftPage = 0;
979 }
980 /* If we got an invalid physical address in the page table, just skip
981 ahead to the next page or the counter reaches zero. This crazy
982 optimization is for a buggy EFI firmware that's driving me nuts. */
983 else if (rcStrict == VERR_PGM_PHYS_TLB_UNASSIGNED)
984 {
985 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cLeftPage;
986 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cLeftPage * cbIncr;
987 if (uCounterReg == 0)
988 break;
989 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
990 {
991 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
992 continue;
993 }
994 }
995 }
996
997 /*
998 * Fallback - slow processing till the end of the current page.
999 * In the cross page boundrary case we will end up here with cLeftPage
1000 * as 0, we execute one loop then.
1001 */
1002 do
1003 {
1004 rcStrict = RT_CONCAT(iemMemStoreDataU,OP_SIZE)(pVCpu, X86_SREG_ES, uAddrReg, uValue);
1005 if (rcStrict != VINF_SUCCESS)
1006 return rcStrict;
1007 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cbIncr;
1008 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
1009 cLeftPage--;
1010 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0);
1011 } while ((int32_t)cLeftPage > 0);
1012
1013 /*
1014 * Next page. Must check for interrupts and stuff here.
1015 */
1016 if (uCounterReg == 0)
1017 break;
1018 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1019 }
1020
1021 /*
1022 * Done.
1023 */
1024 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1025}
1026
1027
1028/**
1029 * Implements 'REP LODS'.
1030 */
1031IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_lods_,OP_rAX,_m,ADDR_SIZE), int8_t, iEffSeg)
1032{
1033 PVM pVM = pVCpu->CTX_SUFF(pVM);
1034
1035 /*
1036 * Setup.
1037 */
1038 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
1039 if (uCounterReg == 0)
1040 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1041
1042 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_SREG_FROM_IDX(iEffSeg));
1043 PCCPUMSELREGHID pSrcHid = iemSRegGetHid(pVCpu, iEffSeg);
1044 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
1045 VBOXSTRICTRC rcStrict = iemMemSegCheckReadAccessEx(pVCpu, pSrcHid, iEffSeg, &uBaseAddr);
1046 if (rcStrict != VINF_SUCCESS)
1047 return rcStrict;
1048
1049 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
1050 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rSI;
1051
1052 /*
1053 * The loop.
1054 */
1055 for (;;)
1056 {
1057 /*
1058 * Do segmentation and virtual page stuff.
1059 */
1060 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
1061 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
1062 if (cLeftPage > uCounterReg)
1063 cLeftPage = uCounterReg;
1064 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
1065 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
1066 && ( IS_64_BIT_CODE(pVCpu)
1067 || ( uAddrReg < pSrcHid->u32Limit
1068 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pSrcHid->u32Limit)
1069 )
1070 )
1071 {
1072 RTGCPHYS GCPhysMem;
1073 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysMem);
1074 if (rcStrict != VINF_SUCCESS)
1075 return rcStrict;
1076
1077 /*
1078 * If we can map the page without trouble, we can get away with
1079 * just reading the last value on the page.
1080 */
1081 PGMPAGEMAPLOCK PgLockMem;
1082 OP_TYPE const *puMem;
1083 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, (void **)&puMem, &PgLockMem);
1084 if (rcStrict == VINF_SUCCESS)
1085 {
1086 /* Only get the last byte, the rest doesn't matter in direct access mode. */
1087#if OP_SIZE == 32
1088 pVCpu->cpum.GstCtx.rax = puMem[cLeftPage - 1];
1089#else
1090 pVCpu->cpum.GstCtx.OP_rAX = puMem[cLeftPage - 1];
1091#endif
1092 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cLeftPage;
1093 pVCpu->cpum.GstCtx.ADDR_rSI = uAddrReg += cLeftPage * cbIncr;
1094 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, puMem, &PgLockMem);
1095
1096 if (uCounterReg == 0)
1097 break;
1098
1099 /* If unaligned, we drop thru and do the page crossing access
1100 below. Otherwise, do the next page. */
1101 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
1102 {
1103 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1104 continue;
1105 }
1106 cLeftPage = 0;
1107 }
1108 }
1109
1110 /*
1111 * Fallback - slow processing till the end of the current page.
1112 * In the cross page boundrary case we will end up here with cLeftPage
1113 * as 0, we execute one loop then.
1114 */
1115 do
1116 {
1117 OP_TYPE uTmpValue;
1118 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uTmpValue, iEffSeg, uAddrReg);
1119 if (rcStrict != VINF_SUCCESS)
1120 return rcStrict;
1121#if OP_SIZE == 32
1122 pVCpu->cpum.GstCtx.rax = uTmpValue;
1123#else
1124 pVCpu->cpum.GstCtx.OP_rAX = uTmpValue;
1125#endif
1126 pVCpu->cpum.GstCtx.ADDR_rSI = uAddrReg += cbIncr;
1127 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
1128 cLeftPage--;
1129 IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0);
1130 } while ((int32_t)cLeftPage > 0);
1131
1132 /*
1133 * Next page. Must check for interrupts and stuff here.
1134 */
1135 if (uCounterReg == 0)
1136 break;
1137 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1138 }
1139
1140 /*
1141 * Done.
1142 */
1143 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1144}
1145
1146
1147#if OP_SIZE != 64
1148
1149/**
1150 * Implements 'INS' (no rep)
1151 */
1152IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_ins_op,OP_SIZE,_addr,ADDR_SIZE), bool, fIoChecked)
1153{
1154 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1155 VBOXSTRICTRC rcStrict;
1156
1157 /*
1158 * Be careful with handle bypassing.
1159 */
1160 if (pVCpu->iem.s.fExec & IEM_F_BYPASS_HANDLERS)
1161 {
1162 Log(("%s: declining because we're bypassing handlers\n", __FUNCTION__));
1163 return VERR_IEM_ASPECT_NOT_IMPLEMENTED;
1164 }
1165
1166 /*
1167 * ASSUMES the #GP for I/O permission is taken first, then any #GP for
1168 * segmentation and finally any #PF due to virtual address translation.
1169 * ASSUMES nothing is read from the I/O port before traps are taken.
1170 */
1171 if (!fIoChecked)
1172 {
1173 rcStrict = iemHlpCheckPortIOPermission(pVCpu, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8);
1174 if (rcStrict != VINF_SUCCESS)
1175 return rcStrict;
1176 }
1177
1178 /*
1179 * Check nested-guest I/O intercepts.
1180 */
1181#ifdef VBOX_WITH_NESTED_HWVIRT_VMX
1182 if (IEM_VMX_IS_NON_ROOT_MODE(pVCpu))
1183 {
1184 VMXEXITINSTRINFO ExitInstrInfo;
1185 ExitInstrInfo.u = 0;
1186 ExitInstrInfo.StrIo.u3AddrSize = ADDR_VMXSTRIO;
1187 ExitInstrInfo.StrIo.iSegReg = X86_SREG_ES;
1188 rcStrict = iemVmxVmexitInstrStrIo(pVCpu, VMXINSTRID_IO_INS, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8, false /* fRep */,
1189 ExitInstrInfo, cbInstr);
1190 if (rcStrict != VINF_VMX_INTERCEPT_NOT_ACTIVE)
1191 return rcStrict;
1192 }
1193#endif
1194
1195#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
1196 if (IEM_SVM_IS_CTRL_INTERCEPT_SET(pVCpu, SVM_CTRL_INTERCEPT_IOIO_PROT))
1197 {
1198 rcStrict = iemSvmHandleIOIntercept(pVCpu, pVCpu->cpum.GstCtx.dx, SVMIOIOTYPE_IN, OP_SIZE / 8, ADDR_SIZE, X86_SREG_ES,
1199 false /* fRep */, true /* fStrIo */, cbInstr);
1200 if (rcStrict == VINF_SVM_VMEXIT)
1201 return VINF_SUCCESS;
1202 if (rcStrict != VINF_SVM_INTERCEPT_NOT_ACTIVE)
1203 {
1204 Log(("iemCImpl_ins_op: iemSvmHandleIOIntercept failed (u16Port=%#x, cbReg=%u) rc=%Rrc\n", pVCpu->cpum.GstCtx.dx,
1205 OP_SIZE / 8, VBOXSTRICTRC_VAL(rcStrict)));
1206 return rcStrict;
1207 }
1208 }
1209#endif
1210
1211 uint8_t bUnmapInfo;
1212 OP_TYPE *puMem;
1213 rcStrict = iemMemMap(pVCpu, (void **)&puMem, &bUnmapInfo, OP_SIZE / 8, X86_SREG_ES, pVCpu->cpum.GstCtx.ADDR_rDI,
1214 IEM_ACCESS_DATA_W, OP_SIZE / 8 - 1);
1215 if (rcStrict != VINF_SUCCESS)
1216 return rcStrict;
1217
1218 uint32_t u32Value = 0;
1219 rcStrict = IOMIOPortRead(pVM, pVCpu, pVCpu->cpum.GstCtx.dx, &u32Value, OP_SIZE / 8);
1220 if (IOM_SUCCESS(rcStrict))
1221 {
1222 /**
1223 * @todo I/O breakpoint support for INS
1224 */
1225 *puMem = (OP_TYPE)u32Value;
1226# ifdef IN_RING3
1227 VBOXSTRICTRC rcStrict2 = iemMemCommitAndUnmap(pVCpu, bUnmapInfo);
1228# else
1229 VBOXSTRICTRC rcStrict2 = iemMemCommitAndUnmapPostponeTroubleToR3(pVCpu, bUnmapInfo);
1230# endif
1231 if (RT_LIKELY(rcStrict2 == VINF_SUCCESS))
1232 {
1233 if (!pVCpu->cpum.GstCtx.eflags.Bits.u1DF)
1234 pVCpu->cpum.GstCtx.ADDR_rDI += OP_SIZE / 8;
1235 else
1236 pVCpu->cpum.GstCtx.ADDR_rDI -= OP_SIZE / 8;
1237
1238 /** @todo finish: work out how this should work wrt status codes. Not sure we
1239 * can use iemSetPassUpStatus here, but it depends on what
1240 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1241 rcStrict2 = iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1242 if (rcStrict2 != VINF_SUCCESS)
1243 {
1244 iemSetPassUpStatus(pVCpu, rcStrict);
1245 rcStrict = rcStrict2;
1246 }
1247 pVCpu->iem.s.cPotentialExits++;
1248 }
1249 else
1250 AssertLogRelMsgFailedReturn(("rcStrict2=%Rrc\n", VBOXSTRICTRC_VAL(rcStrict2)), RT_FAILURE_NP(rcStrict2) ? rcStrict2 : VERR_IEM_IPE_1);
1251 }
1252 return rcStrict;
1253}
1254
1255
1256/**
1257 * Implements 'REP INS'.
1258 */
1259IEM_CIMPL_DEF_1(RT_CONCAT4(iemCImpl_rep_ins_op,OP_SIZE,_addr,ADDR_SIZE), bool, fIoChecked)
1260{
1261 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1262
1263 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_ES | CPUMCTX_EXTRN_TR);
1264
1265 /*
1266 * Setup.
1267 */
1268 uint16_t const u16Port = pVCpu->cpum.GstCtx.dx;
1269 VBOXSTRICTRC rcStrict;
1270 if (!fIoChecked)
1271 {
1272/** @todo check if this is too early for ecx=0. */
1273 rcStrict = iemHlpCheckPortIOPermission(pVCpu, u16Port, OP_SIZE / 8);
1274 if (rcStrict != VINF_SUCCESS)
1275 return rcStrict;
1276 }
1277
1278 /*
1279 * Check nested-guest I/O intercepts.
1280 */
1281#ifdef VBOX_WITH_NESTED_HWVIRT_VMX
1282 if (IEM_VMX_IS_NON_ROOT_MODE(pVCpu))
1283 {
1284 VMXEXITINSTRINFO ExitInstrInfo;
1285 ExitInstrInfo.u = 0;
1286 ExitInstrInfo.StrIo.u3AddrSize = ADDR_VMXSTRIO;
1287 ExitInstrInfo.StrIo.iSegReg = X86_SREG_ES;
1288 rcStrict = iemVmxVmexitInstrStrIo(pVCpu, VMXINSTRID_IO_INS, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8, true /* fRep */,
1289 ExitInstrInfo, cbInstr);
1290 if (rcStrict != VINF_VMX_INTERCEPT_NOT_ACTIVE)
1291 return rcStrict;
1292 }
1293#endif
1294
1295#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
1296 if (IEM_SVM_IS_CTRL_INTERCEPT_SET(pVCpu, SVM_CTRL_INTERCEPT_IOIO_PROT))
1297 {
1298 rcStrict = iemSvmHandleIOIntercept(pVCpu, u16Port, SVMIOIOTYPE_IN, OP_SIZE / 8, ADDR_SIZE, X86_SREG_ES, true /* fRep */,
1299 true /* fStrIo */, cbInstr);
1300 if (rcStrict == VINF_SVM_VMEXIT)
1301 return VINF_SUCCESS;
1302 if (rcStrict != VINF_SVM_INTERCEPT_NOT_ACTIVE)
1303 {
1304 Log(("iemCImpl_rep_ins_op: iemSvmHandleIOIntercept failed (u16Port=%#x, cbReg=%u) rc=%Rrc\n", u16Port, OP_SIZE / 8,
1305 VBOXSTRICTRC_VAL(rcStrict)));
1306 return rcStrict;
1307 }
1308 }
1309#endif
1310
1311 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
1312 if (uCounterReg == 0)
1313 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1314
1315 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
1316 rcStrict = iemMemSegCheckWriteAccessEx(pVCpu, iemSRegUpdateHid(pVCpu, &pVCpu->cpum.GstCtx.es), X86_SREG_ES, &uBaseAddr);
1317 if (rcStrict != VINF_SUCCESS)
1318 return rcStrict;
1319
1320 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
1321 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rDI;
1322
1323 /*
1324 * Be careful with handle bypassing.
1325 */
1326 if (pVCpu->iem.s.fExec & IEM_F_BYPASS_HANDLERS)
1327 {
1328 Log(("%s: declining because we're bypassing handlers\n", __FUNCTION__));
1329 return VERR_IEM_ASPECT_NOT_IMPLEMENTED;
1330 }
1331
1332 /*
1333 * The loop.
1334 */
1335 for (;;)
1336 {
1337 /*
1338 * Do segmentation and virtual page stuff.
1339 */
1340 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
1341 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
1342 if (cLeftPage > uCounterReg)
1343 cLeftPage = uCounterReg;
1344 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
1345 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
1346 && ( IS_64_BIT_CODE(pVCpu)
1347 || ( uAddrReg < pVCpu->cpum.GstCtx.es.u32Limit
1348 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pVCpu->cpum.GstCtx.es.u32Limit)
1349 )
1350 )
1351 {
1352 RTGCPHYS GCPhysMem;
1353 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_W, &GCPhysMem);
1354 if (rcStrict != VINF_SUCCESS)
1355 return rcStrict;
1356
1357 /*
1358 * If we can map the page without trouble, use the IOM
1359 * string I/O interface to do the work.
1360 */
1361 PGMPAGEMAPLOCK PgLockMem;
1362 OP_TYPE *puMem;
1363 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_W, (void **)&puMem, &PgLockMem);
1364 if (rcStrict == VINF_SUCCESS)
1365 {
1366 uint32_t cTransfers = cLeftPage;
1367 rcStrict = IOMIOPortReadString(pVM, pVCpu, u16Port, puMem, &cTransfers, OP_SIZE / 8);
1368
1369 uint32_t cActualTransfers = cLeftPage - cTransfers;
1370 Assert(cActualTransfers <= cLeftPage);
1371 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cbIncr * cActualTransfers;
1372 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cActualTransfers;
1373 puMem += cActualTransfers;
1374
1375 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_W, puMem, &PgLockMem);
1376
1377 if (rcStrict != VINF_SUCCESS)
1378 {
1379 if (IOM_SUCCESS(rcStrict))
1380 {
1381 /** @todo finish: work out how this should work wrt status codes. Not sure we
1382 * can use iemSetPassUpStatus here, but it depends on what
1383 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1384 rcStrict = iemSetPassUpStatus(pVCpu, rcStrict);
1385 if (uCounterReg == 0)
1386 rcStrict = iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1387 pVCpu->iem.s.cPotentialExits++;
1388 }
1389 return rcStrict;
1390 }
1391
1392 /* If unaligned, we drop thru and do the page crossing access
1393 below. Otherwise, do the next page. */
1394 if (uCounterReg == 0)
1395 break;
1396 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
1397 {
1398 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1399 continue;
1400 }
1401 cLeftPage = 0;
1402 }
1403 }
1404
1405 /*
1406 * Fallback - slow processing till the end of the current page.
1407 * In the cross page boundrary case we will end up here with cLeftPage
1408 * as 0, we execute one loop then.
1409 *
1410 * Note! We ASSUME the CPU will raise #PF or #GP before access the
1411 * I/O port, otherwise it wouldn't really be restartable.
1412 */
1413 /** @todo investigate what the CPU actually does with \#PF/\#GP
1414 * during INS. */
1415 do
1416 {
1417 uint8_t bUnmapInfo;
1418 OP_TYPE *puMem;
1419 rcStrict = iemMemMap(pVCpu, (void **)&puMem, &bUnmapInfo, OP_SIZE / 8, X86_SREG_ES, uAddrReg,
1420 IEM_ACCESS_DATA_W, OP_SIZE / 8 - 1);
1421 if (rcStrict != VINF_SUCCESS)
1422 return rcStrict;
1423
1424 uint32_t u32Value = 0;
1425 rcStrict = IOMIOPortRead(pVM, pVCpu, u16Port, &u32Value, OP_SIZE / 8);
1426 if (!IOM_SUCCESS(rcStrict))
1427 {
1428 iemMemRollback(pVCpu);
1429 return rcStrict;
1430 }
1431
1432 *puMem = (OP_TYPE)u32Value;
1433# ifdef IN_RING3
1434 VBOXSTRICTRC rcStrict2 = iemMemCommitAndUnmap(pVCpu, bUnmapInfo);
1435# else
1436 VBOXSTRICTRC rcStrict2 = iemMemCommitAndUnmapPostponeTroubleToR3(pVCpu, bUnmapInfo);
1437# endif
1438 if (rcStrict2 == VINF_SUCCESS)
1439 { /* likely */ }
1440 else
1441 AssertLogRelMsgFailedReturn(("rcStrict2=%Rrc\n", VBOXSTRICTRC_VAL(rcStrict2)),
1442 RT_FAILURE(rcStrict2) ? rcStrict2 : VERR_IEM_IPE_1);
1443
1444 pVCpu->cpum.GstCtx.ADDR_rDI = uAddrReg += cbIncr;
1445 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
1446
1447 cLeftPage--;
1448 if (rcStrict != VINF_SUCCESS)
1449 {
1450 /** @todo finish: work out how this should work wrt status codes. Not sure we
1451 * can use iemSetPassUpStatus here, but it depends on what
1452 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1453 rcStrict = iemSetPassUpStatus(pVCpu, rcStrict);
1454 if (uCounterReg == 0)
1455 rcStrict = iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1456 pVCpu->iem.s.cPotentialExits++;
1457 return rcStrict;
1458 }
1459
1460 IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0);
1461 } while ((int32_t)cLeftPage > 0);
1462
1463
1464 /*
1465 * Next page. Must check for interrupts and stuff here.
1466 */
1467 if (uCounterReg == 0)
1468 break;
1469 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1470 }
1471
1472 /*
1473 * Done.
1474 */
1475 pVCpu->iem.s.cPotentialExits++;
1476 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1477}
1478
1479
1480/**
1481 * Implements 'OUTS' (no rep)
1482 */
1483IEM_CIMPL_DEF_2(RT_CONCAT4(iemCImpl_outs_op,OP_SIZE,_addr,ADDR_SIZE), uint8_t, iEffSeg, bool, fIoChecked)
1484{
1485 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1486 VBOXSTRICTRC rcStrict;
1487
1488 /*
1489 * ASSUMES the #GP for I/O permission is taken first, then any #GP for
1490 * segmentation and finally any #PF due to virtual address translation.
1491 * ASSUMES nothing is read from the I/O port before traps are taken.
1492 */
1493 if (!fIoChecked)
1494 {
1495 rcStrict = iemHlpCheckPortIOPermission(pVCpu, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8);
1496 if (rcStrict != VINF_SUCCESS)
1497 return rcStrict;
1498 }
1499
1500 /*
1501 * Check nested-guest I/O intercepts.
1502 */
1503#ifdef VBOX_WITH_NESTED_HWVIRT_VMX
1504 if (IEM_VMX_IS_NON_ROOT_MODE(pVCpu))
1505 {
1506 VMXEXITINSTRINFO ExitInstrInfo;
1507 ExitInstrInfo.u = 0;
1508 ExitInstrInfo.StrIo.u3AddrSize = ADDR_VMXSTRIO;
1509 ExitInstrInfo.StrIo.iSegReg = iEffSeg;
1510 rcStrict = iemVmxVmexitInstrStrIo(pVCpu, VMXINSTRID_IO_OUTS, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8, false /* fRep */,
1511 ExitInstrInfo, cbInstr);
1512 if (rcStrict != VINF_VMX_INTERCEPT_NOT_ACTIVE)
1513 return rcStrict;
1514 }
1515#endif
1516
1517#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
1518 if (IEM_SVM_IS_CTRL_INTERCEPT_SET(pVCpu, SVM_CTRL_INTERCEPT_IOIO_PROT))
1519 {
1520 rcStrict = iemSvmHandleIOIntercept(pVCpu, pVCpu->cpum.GstCtx.dx, SVMIOIOTYPE_OUT, OP_SIZE / 8, ADDR_SIZE, iEffSeg,
1521 false /* fRep */, true /* fStrIo */, cbInstr);
1522 if (rcStrict == VINF_SVM_VMEXIT)
1523 return VINF_SUCCESS;
1524 if (rcStrict != VINF_SVM_INTERCEPT_NOT_ACTIVE)
1525 {
1526 Log(("iemCImpl_outs_op: iemSvmHandleIOIntercept failed (u16Port=%#x, cbReg=%u) rc=%Rrc\n", pVCpu->cpum.GstCtx.dx,
1527 OP_SIZE / 8, VBOXSTRICTRC_VAL(rcStrict)));
1528 return rcStrict;
1529 }
1530 }
1531#endif
1532
1533 OP_TYPE uValue;
1534 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue, iEffSeg, pVCpu->cpum.GstCtx.ADDR_rSI);
1535 if (rcStrict == VINF_SUCCESS)
1536 {
1537 rcStrict = IOMIOPortWrite(pVM, pVCpu, pVCpu->cpum.GstCtx.dx, uValue, OP_SIZE / 8);
1538 if (IOM_SUCCESS(rcStrict))
1539 {
1540 if (!pVCpu->cpum.GstCtx.eflags.Bits.u1DF)
1541 pVCpu->cpum.GstCtx.ADDR_rSI += OP_SIZE / 8;
1542 else
1543 pVCpu->cpum.GstCtx.ADDR_rSI -= OP_SIZE / 8;
1544 /** @todo finish: work out how this should work wrt status codes. Not sure we
1545 * can use iemSetPassUpStatus here, but it depends on what
1546 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1547 if (rcStrict != VINF_SUCCESS)
1548 rcStrict = iemSetPassUpStatus(pVCpu, rcStrict);
1549 rcStrict = iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1550 pVCpu->iem.s.cPotentialExits++;
1551 }
1552 }
1553 return rcStrict;
1554}
1555
1556
1557/**
1558 * Implements 'REP OUTS'.
1559 */
1560IEM_CIMPL_DEF_2(RT_CONCAT4(iemCImpl_rep_outs_op,OP_SIZE,_addr,ADDR_SIZE), uint8_t, iEffSeg, bool, fIoChecked)
1561{
1562 PVMCC pVM = pVCpu->CTX_SUFF(pVM);
1563
1564 /*
1565 * Setup.
1566 */
1567 uint16_t const u16Port = pVCpu->cpum.GstCtx.dx;
1568 VBOXSTRICTRC rcStrict;
1569 if (!fIoChecked)
1570 {
1571/** @todo check if this is too early for ecx=0. */
1572 rcStrict = iemHlpCheckPortIOPermission(pVCpu, u16Port, OP_SIZE / 8);
1573 if (rcStrict != VINF_SUCCESS)
1574 return rcStrict;
1575 }
1576
1577 /*
1578 * Check nested-guest I/O intercepts.
1579 */
1580#ifdef VBOX_WITH_NESTED_HWVIRT_VMX
1581 if (IEM_VMX_IS_NON_ROOT_MODE(pVCpu))
1582 {
1583 VMXEXITINSTRINFO ExitInstrInfo;
1584 ExitInstrInfo.u = 0;
1585 ExitInstrInfo.StrIo.u3AddrSize = ADDR_VMXSTRIO;
1586 ExitInstrInfo.StrIo.iSegReg = iEffSeg;
1587 rcStrict = iemVmxVmexitInstrStrIo(pVCpu, VMXINSTRID_IO_OUTS, pVCpu->cpum.GstCtx.dx, OP_SIZE / 8, true /* fRep */,
1588 ExitInstrInfo, cbInstr);
1589 if (rcStrict != VINF_VMX_INTERCEPT_NOT_ACTIVE)
1590 return rcStrict;
1591 }
1592#endif
1593
1594#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
1595 if (IEM_SVM_IS_CTRL_INTERCEPT_SET(pVCpu, SVM_CTRL_INTERCEPT_IOIO_PROT))
1596 {
1597 rcStrict = iemSvmHandleIOIntercept(pVCpu, u16Port, SVMIOIOTYPE_OUT, OP_SIZE / 8, ADDR_SIZE, iEffSeg, true /* fRep */,
1598 true /* fStrIo */, cbInstr);
1599 if (rcStrict == VINF_SVM_VMEXIT)
1600 return VINF_SUCCESS;
1601 if (rcStrict != VINF_SVM_INTERCEPT_NOT_ACTIVE)
1602 {
1603 Log(("iemCImpl_rep_outs_op: iemSvmHandleIOIntercept failed (u16Port=%#x, cbReg=%u) rc=%Rrc\n", u16Port, OP_SIZE / 8,
1604 VBOXSTRICTRC_VAL(rcStrict)));
1605 return rcStrict;
1606 }
1607 }
1608#endif
1609
1610 ADDR_TYPE uCounterReg = pVCpu->cpum.GstCtx.ADDR_rCX;
1611 if (uCounterReg == 0)
1612 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1613
1614 IEM_CTX_IMPORT_RET(pVCpu, CPUMCTX_EXTRN_SREG_FROM_IDX(iEffSeg) | CPUMCTX_EXTRN_ES);
1615 PCCPUMSELREGHID pHid = iemSRegGetHid(pVCpu, iEffSeg);
1616 uint64_t uBaseAddr = 0; /* gcc may not be used uninitialized */
1617 rcStrict = iemMemSegCheckReadAccessEx(pVCpu, pHid, iEffSeg, &uBaseAddr);
1618 if (rcStrict != VINF_SUCCESS)
1619 return rcStrict;
1620
1621 int8_t const cbIncr = pVCpu->cpum.GstCtx.eflags.Bits.u1DF ? -(OP_SIZE / 8) : (OP_SIZE / 8);
1622 ADDR_TYPE uAddrReg = pVCpu->cpum.GstCtx.ADDR_rSI;
1623
1624 /*
1625 * The loop.
1626 */
1627 for (;;)
1628 {
1629 /*
1630 * Do segmentation and virtual page stuff.
1631 */
1632 ADDR2_TYPE uVirtAddr = uAddrReg + (ADDR2_TYPE)uBaseAddr;
1633 uint32_t cLeftPage = (GUEST_PAGE_SIZE - (uVirtAddr & GUEST_PAGE_OFFSET_MASK)) / (OP_SIZE / 8);
1634 if (cLeftPage > uCounterReg)
1635 cLeftPage = uCounterReg;
1636 if ( cLeftPage > 0 /* can be null if unaligned, do one fallback round. */
1637 && cbIncr > 0 /** @todo Implement reverse direction string ops. */
1638 && ( IS_64_BIT_CODE(pVCpu)
1639 || ( uAddrReg < pHid->u32Limit
1640 && uAddrReg + (cLeftPage * (OP_SIZE / 8)) <= pHid->u32Limit)
1641 )
1642 )
1643 {
1644 RTGCPHYS GCPhysMem;
1645 rcStrict = iemMemPageTranslateAndCheckAccess(pVCpu, uVirtAddr, OP_SIZE / 8, IEM_ACCESS_DATA_R, &GCPhysMem);
1646 if (rcStrict != VINF_SUCCESS)
1647 return rcStrict;
1648
1649 /*
1650 * If we can map the page without trouble, we use the IOM
1651 * string I/O interface to do the job.
1652 */
1653 PGMPAGEMAPLOCK PgLockMem;
1654 OP_TYPE const *puMem;
1655 rcStrict = iemMemPageMap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, (void **)&puMem, &PgLockMem);
1656 if (rcStrict == VINF_SUCCESS)
1657 {
1658 uint32_t cTransfers = cLeftPage;
1659 rcStrict = IOMIOPortWriteString(pVM, pVCpu, u16Port, puMem, &cTransfers, OP_SIZE / 8);
1660
1661 uint32_t cActualTransfers = cLeftPage - cTransfers;
1662 Assert(cActualTransfers <= cLeftPage);
1663 pVCpu->cpum.GstCtx.ADDR_rSI = uAddrReg += cbIncr * cActualTransfers;
1664 pVCpu->cpum.GstCtx.ADDR_rCX = uCounterReg -= cActualTransfers;
1665 puMem += cActualTransfers;
1666
1667 iemMemPageUnmap(pVCpu, GCPhysMem, IEM_ACCESS_DATA_R, puMem, &PgLockMem);
1668
1669 if (rcStrict != VINF_SUCCESS)
1670 {
1671 if (IOM_SUCCESS(rcStrict))
1672 {
1673 /** @todo finish: work out how this should work wrt status codes. Not sure we
1674 * can use iemSetPassUpStatus here, but it depends on what
1675 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1676 rcStrict = iemSetPassUpStatus(pVCpu, rcStrict);
1677 if (uCounterReg == 0)
1678 rcStrict = iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1679 pVCpu->iem.s.cPotentialExits++;
1680 }
1681 return rcStrict;
1682 }
1683
1684 if (uCounterReg == 0)
1685 break;
1686
1687 /* If unaligned, we drop thru and do the page crossing access
1688 below. Otherwise, do the next page. */
1689 if (!(uVirtAddr & (OP_SIZE / 8 - 1)))
1690 {
1691 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1692 continue;
1693 }
1694 cLeftPage = 0;
1695 }
1696 }
1697
1698 /*
1699 * Fallback - slow processing till the end of the current page.
1700 * In the cross page boundrary case we will end up here with cLeftPage
1701 * as 0, we execute one loop then.
1702 *
1703 * Note! We ASSUME the CPU will raise #PF or #GP before access the
1704 * I/O port, otherwise it wouldn't really be restartable.
1705 */
1706 /** @todo investigate what the CPU actually does with \#PF/\#GP
1707 * during INS. */
1708 do
1709 {
1710 OP_TYPE uValue;
1711 rcStrict = RT_CONCAT(iemMemFetchDataU,OP_SIZE)(pVCpu, &uValue, iEffSeg, uAddrReg);
1712 if (rcStrict != VINF_SUCCESS)
1713 return rcStrict;
1714
1715 rcStrict = IOMIOPortWrite(pVM, pVCpu, u16Port, uValue, OP_SIZE / 8);
1716 if (IOM_SUCCESS(rcStrict))
1717 {
1718 pVCpu->cpum.GstCtx.ADDR_rSI = uAddrReg += cbIncr;
1719 pVCpu->cpum.GstCtx.ADDR_rCX = --uCounterReg;
1720 cLeftPage--;
1721 }
1722 if (rcStrict != VINF_SUCCESS)
1723 {
1724 if (IOM_SUCCESS(rcStrict))
1725 {
1726 /** @todo finish: work out how this should work wrt status codes. Not sure we
1727 * can use iemSetPassUpStatus here, but it depends on what
1728 * iemRegAddToRipAndFinishingClearingRF may eventually return (if anything)... */
1729 rcStrict = iemSetPassUpStatus(pVCpu, rcStrict);
1730 if (uCounterReg == 0)
1731 iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1732 pVCpu->iem.s.cPotentialExits++;
1733 }
1734 return rcStrict;
1735 }
1736 IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN(pVM, pVCpu, uCounterReg == 0);
1737 } while ((int32_t)cLeftPage > 0);
1738
1739
1740 /*
1741 * Next page. Must check for interrupts and stuff here.
1742 */
1743 if (uCounterReg == 0)
1744 break;
1745 IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN(pVM, pVCpu, pVCpu->cpum.GstCtx.eflags.u);
1746 }
1747
1748 /*
1749 * Done.
1750 */
1751 pVCpu->iem.s.cPotentialExits++;
1752 return iemRegAddToRipAndFinishingClearingRF(pVCpu, cbInstr);
1753}
1754
1755#endif /* OP_SIZE != 64-bit */
1756
1757
1758#undef OP_rAX
1759#undef OP_SIZE
1760#undef ADDR_SIZE
1761#undef ADDR_rDI
1762#undef ADDR_rSI
1763#undef ADDR_rCX
1764#undef ADDR_rIP
1765#undef ADDR2_TYPE
1766#undef ADDR_TYPE
1767#undef ADDR2_TYPE
1768#undef ADDR_VMXSTRIO
1769#undef IS_64_BIT_CODE
1770#undef IEM_CHECK_FF_YIELD_REPSTR_MAYBE_RETURN
1771#undef IEM_CHECK_FF_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN
1772#undef IEM_CHECK_FF_CPU_HIGH_PRIORITY_POST_REPSTR_MAYBE_RETURN
1773
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