SELMAll.cpp@ 107044

Last change on this file since 107044 was 106061, checked in by vboxsync, 2 months ago
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1	/* $Id: SELMAll.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* SELM All contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2024 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	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_SELM
33	#include <VBox/vmm/selm.h>
34	#include <VBox/vmm/stam.h>
35	#include <VBox/vmm/em.h>
36	#include <VBox/vmm/mm.h>
37	#include <VBox/vmm/hm.h>
38	#include <VBox/vmm/pgm.h>
39	#include <VBox/vmm/hm.h>
40	#include "SELMInternal.h"
41	#include <VBox/vmm/vmcc.h>
42	#include <VBox/err.h>
43	#include <VBox/param.h>
44	#include <iprt/assert.h>
45	#include <VBox/vmm/vmm.h>
46	#include <iprt/x86.h>
47	#include <iprt/string.h>
48
49
50
51	/**
52	* Converts a GC selector based address to a flat address.
53	*
54	* No limit checks are done. Use the SELMToFlat() or SELMValidate() functions
55	* for that.
56	*
57	* @returns Flat address.
58	* @param pVCpu The cross context virtual CPU structure.
59	* @param idxSeg The selector register to use (X86_SREG_XXX).
60	* @param pCtx Pointer to the register context for the CPU.
61	* @param Addr Address part.
62	*/
63	VMMDECL(RTGCPTR) SELMToFlat(PVMCPUCC pVCpu, unsigned idxSeg, PCPUMCTX pCtx, RTGCPTR Addr)
64	{
65	Assert(idxSeg < RT_ELEMENTS(pCtx->aSRegs));
66	PCPUMSELREG pSReg = &pCtx->aSRegs[idxSeg];
67
68	/*
69	* Deal with real & v86 mode first.
70	*/
71	if ( pCtx->eflags.Bits.u1VM
72	\|\| CPUMIsGuestInRealMode(pVCpu))
73	{
74	uint32_t uFlat = (uint32_t)Addr & 0xffff;
75	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSReg))
76	uFlat += (uint32_t)pSReg->u64Base;
77	else
78	uFlat += (uint32_t)pSReg->Sel << 4;
79	return (RTGCPTR)uFlat;
80	}
81
82	Assert(CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSReg));
83	Assert(CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &pCtx->cs));
84
85	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0
86	(Intel(r) 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
87	if ( pCtx->cs.Attr.n.u1Long
88	&& CPUMIsGuestInLongMode(pVCpu))
89	{
90	switch (idxSeg)
91	{
92	case X86_SREG_FS:
93	case X86_SREG_GS:
94	return (RTGCPTR)(pSReg->u64Base + Addr);
95
96	default:
97	return Addr; /* base 0 */
98	}
99	}
100
101	/* AMD64 manual: compatibility mode ignores the high 32 bits when calculating an effective address. */
102	Assert(pSReg->u64Base <= 0xffffffff);
103	return (uint32_t)pSReg->u64Base + (uint32_t)Addr;
104	}
105
106
107	/**
108	* Converts a GC selector based address to a flat address.
109	*
110	* Some basic checking is done, but not all kinds yet.
111	*
112	* @returns VBox status
113	* @param pVCpu The cross context virtual CPU structure.
114	* @param idxSeg The selector register to use (X86_SREG_XXX).
115	* @param pCtx Pointer to the register context for the CPU.
116	* @param Addr Address part.
117	* @param fFlags SELMTOFLAT_FLAGS_*
118	* GDT entires are valid.
119	* @param ppvGC Where to store the GC flat address.
120	*/
121	VMMDECL(int) SELMToFlatEx(PVMCPU pVCpu, unsigned idxSeg, PCPUMCTX pCtx, RTGCPTR Addr, uint32_t fFlags, PRTGCPTR ppvGC)
122	{
123	AssertReturn(idxSeg < RT_ELEMENTS(pCtx->aSRegs), VERR_INVALID_PARAMETER);
124	PCPUMSELREG pSReg = &pCtx->aSRegs[idxSeg];
125
126	/*
127	* Deal with real & v86 mode first.
128	*/
129	if ( pCtx->eflags.Bits.u1VM
130	\|\| CPUMIsGuestInRealMode(pVCpu))
131	{
132	if (ppvGC)
133	{
134	uint32_t uFlat = (uint32_t)Addr & 0xffff;
135	if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSReg))
136	*ppvGC = (uint32_t)pSReg->u64Base + uFlat;
137	else
138	*ppvGC = ((uint32_t)pSReg->Sel << 4) + uFlat;
139	}
140	return VINF_SUCCESS;
141	}
142
143	Assert(CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSReg));
144	Assert(CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &pCtx->cs));
145
146	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0
147	(Intel(r) 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
148	RTGCPTR pvFlat;
149	bool fCheckLimit = true;
150	if ( pCtx->cs.Attr.n.u1Long
151	&& CPUMIsGuestInLongMode(pVCpu))
152	{
153	fCheckLimit = false;
154	switch (idxSeg)
155	{
156	case X86_SREG_FS:
157	case X86_SREG_GS:
158	pvFlat = pSReg->u64Base + Addr;
159	break;
160
161	default:
162	pvFlat = Addr;
163	break;
164	}
165	}
166	else
167	{
168	/* AMD64 manual: compatibility mode ignores the high 32 bits when calculating an effective address. */
169	Assert(pSReg->u64Base <= UINT32_C(0xffffffff));
170	pvFlat = (uint32_t)pSReg->u64Base + (uint32_t)Addr;
171	Assert(pvFlat <= UINT32_MAX);
172	}
173
174	/*
175	* Check type if present.
176	*/
177	if (pSReg->Attr.n.u1Present)
178	{
179	switch (pSReg->Attr.n.u4Type)
180	{
181	/* Read only selector type. */
182	case X86_SEL_TYPE_RO:
183	case X86_SEL_TYPE_RO_ACC:
184	case X86_SEL_TYPE_RW:
185	case X86_SEL_TYPE_RW_ACC:
186	case X86_SEL_TYPE_EO:
187	case X86_SEL_TYPE_EO_ACC:
188	case X86_SEL_TYPE_ER:
189	case X86_SEL_TYPE_ER_ACC:
190	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
191	{
192	/** @todo fix this mess */
193	}
194	/* check limit. */
195	if (fCheckLimit && Addr > pSReg->u32Limit)
196	return VERR_OUT_OF_SELECTOR_BOUNDS;
197	/* ok */
198	if (ppvGC)
199	*ppvGC = pvFlat;
200	return VINF_SUCCESS;
201
202	case X86_SEL_TYPE_EO_CONF:
203	case X86_SEL_TYPE_EO_CONF_ACC:
204	case X86_SEL_TYPE_ER_CONF:
205	case X86_SEL_TYPE_ER_CONF_ACC:
206	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
207	{
208	/** @todo fix this mess */
209	}
210	/* check limit. */
211	if (fCheckLimit && Addr > pSReg->u32Limit)
212	return VERR_OUT_OF_SELECTOR_BOUNDS;
213	/* ok */
214	if (ppvGC)
215	*ppvGC = pvFlat;
216	return VINF_SUCCESS;
217
218	case X86_SEL_TYPE_RO_DOWN:
219	case X86_SEL_TYPE_RO_DOWN_ACC:
220	case X86_SEL_TYPE_RW_DOWN:
221	case X86_SEL_TYPE_RW_DOWN_ACC:
222	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
223	{
224	/** @todo fix this mess */
225	}
226	/* check limit. */
227	if (fCheckLimit)
228	{
229	if (!pSReg->Attr.n.u1Granularity && Addr > UINT32_C(0xffff))
230	return VERR_OUT_OF_SELECTOR_BOUNDS;
231	if (Addr <= pSReg->u32Limit)
232	return VERR_OUT_OF_SELECTOR_BOUNDS;
233	}
234	/* ok */
235	if (ppvGC)
236	*ppvGC = pvFlat;
237	return VINF_SUCCESS;
238
239	default:
240	return VERR_INVALID_SELECTOR;
241
242	}
243	}
244	return VERR_SELECTOR_NOT_PRESENT;
245	}
246
247
248
249	/**
250	* Validates and converts a GC selector based code address to a flat
251	* address when in real or v8086 mode.
252	*
253	* @returns VINF_SUCCESS.
254	* @param pVCpu The cross context virtual CPU structure.
255	* @param SelCS Selector part.
256	* @param pSReg The hidden CS register part. Optional.
257	* @param Addr Address part.
258	* @param ppvFlat Where to store the flat address.
259	*/
260	DECLINLINE(int) selmValidateAndConvertCSAddrRealMode(PVMCPU pVCpu, RTSEL SelCS, PCCPUMSELREGHID pSReg, RTGCPTR Addr,
261	PRTGCPTR ppvFlat)
262	{
263	NOREF(pVCpu);
264	uint32_t uFlat = Addr & 0xffff;
265	if (!pSReg \|\| !CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSReg))
266	uFlat += (uint32_t)SelCS << 4;
267	else
268	uFlat += (uint32_t)pSReg->u64Base;
269	*ppvFlat = uFlat;
270	return VINF_SUCCESS;
271	}
272
273
274	/**
275	* Validates and converts a GC selector based code address to a flat address
276	* when in protected/long mode using the standard hidden selector registers
277	*
278	* @returns VBox status code.
279	* @param pVCpu The cross context virtual CPU structure.
280	* @param SelCPL Current privilege level. Get this from SS - CS might be
281	* conforming! A full selector can be passed, we'll only
282	* use the RPL part.
283	* @param SelCS Selector part.
284	* @param pSRegCS The full CS selector register.
285	* @param Addr The address (think IP/EIP/RIP).
286	* @param ppvFlat Where to store the flat address upon successful return.
287	*/
288	DECLINLINE(int) selmValidateAndConvertCSAddrHidden(PVMCPU pVCpu, RTSEL SelCPL, RTSEL SelCS, PCCPUMSELREGHID pSRegCS,
289	RTGCPTR Addr, PRTGCPTR ppvFlat)
290	{
291	NOREF(SelCPL); NOREF(SelCS);
292
293	/*
294	* Check if present.
295	*/
296	if (pSRegCS->Attr.n.u1Present)
297	{
298	/*
299	* Type check.
300	*/
301	if ( pSRegCS->Attr.n.u1DescType == 1
302	&& (pSRegCS->Attr.n.u4Type & X86_SEL_TYPE_CODE))
303	{
304	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0
305	(Intel(r) 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
306	if ( pSRegCS->Attr.n.u1Long
307	&& CPUMIsGuestInLongMode(pVCpu))
308	{
309	*ppvFlat = Addr;
310	return VINF_SUCCESS;
311	}
312
313	/*
314	* Limit check. Note that the limit in the hidden register is the
315	* final value. The granularity bit was included in its calculation.
316	*/
317	uint32_t u32Limit = pSRegCS->u32Limit;
318	if ((uint32_t)Addr <= u32Limit)
319	{
320	*ppvFlat = (uint32_t)Addr + (uint32_t)pSRegCS->u64Base;
321	return VINF_SUCCESS;
322	}
323
324	return VERR_OUT_OF_SELECTOR_BOUNDS;
325	}
326	return VERR_NOT_CODE_SELECTOR;
327	}
328	return VERR_SELECTOR_NOT_PRESENT;
329	}
330
331
332	/**
333	* Validates and converts a GC selector based code address to a flat address.
334	*
335	* @returns VBox status code.
336	* @param pVCpu The cross context virtual CPU structure.
337	* @param fEFlags Current EFLAGS.
338	* @param SelCPL Current privilege level. Get this from SS - CS might be
339	* conforming! A full selector can be passed, we'll only
340	* use the RPL part.
341	* @param SelCS Selector part.
342	* @param pSRegCS The full CS selector register.
343	* @param Addr The address (think IP/EIP/RIP).
344	* @param ppvFlat Where to store the flat address upon successful return.
345	*/
346	VMMDECL(int) SELMValidateAndConvertCSAddr(PVMCPU pVCpu, uint32_t fEFlags, RTSEL SelCPL, RTSEL SelCS, PCPUMSELREG pSRegCS,
347	RTGCPTR Addr, PRTGCPTR ppvFlat)
348	{
349	if ( (fEFlags & X86_EFL_VM)
350	\|\| CPUMIsGuestInRealMode(pVCpu))
351	return selmValidateAndConvertCSAddrRealMode(pVCpu, SelCS, pSRegCS, Addr, ppvFlat);
352
353	Assert(CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, pSRegCS));
354	Assert(pSRegCS->Sel == SelCS);
355
356	return selmValidateAndConvertCSAddrHidden(pVCpu, SelCPL, SelCS, pSRegCS, Addr, ppvFlat);
357	}
358
359
360	/**
361	* Gets info about the current TSS.
362	*
363	* @returns VBox status code.
364	* @retval VINF_SUCCESS if we've got a TSS loaded.
365	* @retval VERR_SELM_NO_TSS if we haven't got a TSS (rather unlikely).
366	*
367	* @param pVM The cross context VM structure.
368	* @param pVCpu The cross context virtual CPU structure.
369	* @param pGCPtrTss Where to store the TSS address.
370	* @param pcbTss Where to store the TSS size limit.
371	* @param pfCanHaveIOBitmap Where to store the can-have-I/O-bitmap indicator. (optional)
372	*/
373	VMMDECL(int) SELMGetTSSInfo(PVM pVM, PVMCPU pVCpu, PRTGCUINTPTR pGCPtrTss, PRTGCUINTPTR pcbTss, bool *pfCanHaveIOBitmap)
374	{
375	NOREF(pVM);
376
377	/*
378	* The TR hidden register is always valid.
379	*/
380	CPUMSELREGHID trHid;
381	RTSEL tr = CPUMGetGuestTR(pVCpu, &trHid);
382	if (!(tr & X86_SEL_MASK_OFF_RPL))
383	return VERR_SELM_NO_TSS;
384
385	*pGCPtrTss = trHid.u64Base;
386	pcbTss = trHid.u32Limit + (trHid.u32Limit != UINT32_MAX); / be careful. */
387	if (pfCanHaveIOBitmap)
388	*pfCanHaveIOBitmap = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
389	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
390	return VINF_SUCCESS;
391	}
392

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source: vbox/trunk/src/VBox/VMM/VMMAll/SELMAll.cpp@ 107044

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