CPUMGCA.asm@ 28800

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1	; $Id: CPUMGCA.asm 28800 2010-04-27 08:22:32Z vboxsync $
2	;; @file
3	; CPUM - Guest Context Assembly Routines.
4	;
5
6	; Copyright (C) 2006-2007 Oracle Corporation
7	;
8	; This file is part of VirtualBox Open Source Edition (OSE), as
9	; available from http://www.virtualbox.org. This file is free software;
10	; you can redistribute it and/or modify it under the terms of the GNU
11	; General Public License (GPL) as published by the Free Software
12	; Foundation, in version 2 as it comes in the "COPYING" file of the
13	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
14	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
15	;
16
17	;*******************************************************************************
18	;* Header Files *
19	;*******************************************************************************
20	%include "VMMGC.mac"
21	%include "VBox/vm.mac"
22	%include "VBox/err.mac"
23	%include "VBox/stam.mac"
24	%include "CPUMInternal.mac"
25	%include "VBox/x86.mac"
26	%include "VBox/cpum.mac"
27
28
29	;*******************************************************************************
30	;* External Symbols *
31	;*******************************************************************************
32	extern IMPNAME(g_CPUM) ; VMM GC Builtin import
33	extern IMPNAME(g_VM) ; VMM GC Builtin import
34	extern NAME(cpumGCHandleNPAndGP) ; CPUMGC.cpp
35
36	;
37	; Enables write protection of Hypervisor memory pages.
38	; !note! Must be commented out for Trap8 debug handler.
39	;
40	%define ENABLE_WRITE_PROTECTION 1
41
42	BEGINCODE
43
44
45	;;
46	; Restores GC context before doing iret.
47	;
48	; @param [esp + 4] Pointer to interrupt stack frame, i.e. pointer
49	; to the a struct with this layout:
50	; 00h eip
51	; 04h cs
52	; 08h eflags
53	; 0ch esp
54	; 10h ss
55	; 14h es (V86 only)
56	; 18h ds (V86 only)
57	; 1Ch fs (V86 only)
58	; 20h gs (V86 only)
59	;
60	; @uses everything but cs, ss, esp, and eflags.
61	;
62	; @remark Assumes we're restoring in Ring-0 a context which is not Ring-0.
63	; Further assumes flat stack and valid ds.
64
65	BEGINPROC CPUMGCRestoreInt
66	;
67	; Update iret frame.
68	;
69	mov eax, [esp + 4] ; get argument
70	mov edx, IMP(g_CPUM)
71	; Convert to CPUMCPU pointer
72	add edx, [edx + CPUM.ulOffCPUMCPU]
73
74	mov ecx, [edx + CPUMCPU.Guest.eip]
75	mov [eax + 0h], ecx
76	mov ecx, [edx + CPUMCPU.Guest.cs]
77	mov [eax + 4h], ecx
78	mov ecx, [edx + CPUMCPU.Guest.eflags]
79	mov [eax + 8h], ecx
80	mov ecx, [edx + CPUMCPU.Guest.esp]
81	mov [eax + 0ch], ecx
82	mov ecx, [edx + CPUMCPU.Guest.ss]
83	mov [eax + 10h], ecx
84
85	test dword [edx + CPUMCPU.Guest.eflags], X86_EFL_VM
86	jnz short CPUMGCRestoreInt_V86
87
88	;
89	; Load registers.
90	;
91	; todo: potential trouble loading invalid es,fs,gs,ds because
92	; of a VMM imposed exception?
93	mov es, [edx + CPUMCPU.Guest.es]
94	mov fs, [edx + CPUMCPU.Guest.fs]
95	mov gs, [edx + CPUMCPU.Guest.gs]
96	mov esi, [edx + CPUMCPU.Guest.esi]
97	mov edi, [edx + CPUMCPU.Guest.edi]
98	mov ebp, [edx + CPUMCPU.Guest.ebp]
99	mov ebx, [edx + CPUMCPU.Guest.ebx]
100	mov ecx, [edx + CPUMCPU.Guest.ecx]
101	mov eax, [edx + CPUMCPU.Guest.eax]
102	push dword [edx + CPUMCPU.Guest.ds]
103	mov edx, [edx + CPUMCPU.Guest.edx]
104	pop ds
105
106	ret
107
108	CPUMGCRestoreInt_V86:
109	; iret restores ds, es, fs & gs
110	mov ecx, [edx + CPUMCPU.Guest.es]
111	mov [eax + 14h], ecx
112	mov ecx, [edx + CPUMCPU.Guest.ds]
113	mov [eax + 18h], ecx
114	mov ecx, [edx + CPUMCPU.Guest.fs]
115	mov [eax + 1Ch], ecx
116	mov ecx, [edx + CPUMCPU.Guest.gs]
117	mov [eax + 20h], ecx
118	mov esi, [edx + CPUMCPU.Guest.esi]
119	mov edi, [edx + CPUMCPU.Guest.edi]
120	mov ebp, [edx + CPUMCPU.Guest.ebp]
121	mov ebx, [edx + CPUMCPU.Guest.ebx]
122	mov ecx, [edx + CPUMCPU.Guest.ecx]
123	mov eax, [edx + CPUMCPU.Guest.eax]
124	mov edx, [edx + CPUMCPU.Guest.edx]
125	ret
126
127	ENDPROC CPUMGCRestoreInt
128
129
130	;;
131	; Calls a guest trap/interrupt handler directly
132	; Assumes a trap stack frame has already been setup on the guest's stack!
133	;
134	; @param pRegFrame [esp + 4] Original trap/interrupt context
135	; @param selCS [esp + 8] Code selector of handler
136	; @param pHandler [esp + 12] GC virtual address of handler
137	; @param eflags [esp + 16] Callee's EFLAGS
138	; @param selSS [esp + 20] Stack selector for handler
139	; @param pEsp [esp + 24] Stack address for handler
140	;
141	; @remark This call never returns!
142	;
143	; VMMRCDECL(void) CPUMGCCallGuestTrapHandler(PCPUMCTXCORE pRegFrame, uint32_t selCS, RTGCPTR pHandler, uint32_t eflags, uint32_t selSS, RTGCPTR pEsp);
144	align 16
145	BEGINPROC_EXPORTED CPUMGCCallGuestTrapHandler
146	mov ebp, esp
147
148	; construct iret stack frame
149	push dword [ebp + 20] ; SS
150	push dword [ebp + 24] ; ESP
151	push dword [ebp + 16] ; EFLAGS
152	push dword [ebp + 8] ; CS
153	push dword [ebp + 12] ; EIP
154
155	;
156	; enable WP
157	;
158	%ifdef ENABLE_WRITE_PROTECTION
159	mov eax, cr0
160	or eax, X86_CR0_WRITE_PROTECT
161	mov cr0, eax
162	%endif
163
164	; restore CPU context (all except cs, eip, ss, esp & eflags; which are restored or overwritten by iret)
165	mov ebp, [ebp + 4] ; pRegFrame
166	mov ebx, [ebp + CPUMCTXCORE.ebx]
167	mov ecx, [ebp + CPUMCTXCORE.ecx]
168	mov edx, [ebp + CPUMCTXCORE.edx]
169	mov esi, [ebp + CPUMCTXCORE.esi]
170	mov edi, [ebp + CPUMCTXCORE.edi]
171
172	;; @todo load segment registers before enabling WP.
173	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_GS \| CPUM_HANDLER_CTXCORE_IN_EBP
174	mov gs, [ebp + CPUMCTXCORE.gs]
175	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_FS \| CPUM_HANDLER_CTXCORE_IN_EBP
176	mov fs, [ebp + CPUMCTXCORE.fs]
177	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_ES \| CPUM_HANDLER_CTXCORE_IN_EBP
178	mov es, [ebp + CPUMCTXCORE.es]
179	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_DS \| CPUM_HANDLER_CTXCORE_IN_EBP
180	mov ds, [ebp + CPUMCTXCORE.ds]
181
182	mov eax, [ebp + CPUMCTXCORE.eax]
183	mov ebp, [ebp + CPUMCTXCORE.ebp]
184
185	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_IRET
186	iret
187	ENDPROC CPUMGCCallGuestTrapHandler
188
189
190	;;
191	; Performs an iret to V86 code
192	; Assumes a trap stack frame has already been setup on the guest's stack!
193	;
194	; @param pRegFrame Original trap/interrupt context
195	;
196	; This function does not return!
197	;
198	;VMMRCDECL(void) CPUMGCCallV86Code(PCPUMCTXCORE pRegFrame);
199	align 16
200	BEGINPROC CPUMGCCallV86Code
201	mov ebp, [esp + 4] ; pRegFrame
202
203	; construct iret stack frame
204	push dword [ebp + CPUMCTXCORE.gs]
205	push dword [ebp + CPUMCTXCORE.fs]
206	push dword [ebp + CPUMCTXCORE.ds]
207	push dword [ebp + CPUMCTXCORE.es]
208	push dword [ebp + CPUMCTXCORE.ss]
209	push dword [ebp + CPUMCTXCORE.esp]
210	push dword [ebp + CPUMCTXCORE.eflags]
211	push dword [ebp + CPUMCTXCORE.cs]
212	push dword [ebp + CPUMCTXCORE.eip]
213
214	;
215	; enable WP
216	;
217	%ifdef ENABLE_WRITE_PROTECTION
218	mov eax, cr0
219	or eax, X86_CR0_WRITE_PROTECT
220	mov cr0, eax
221	%endif
222
223	; restore CPU context (all except cs, eip, ss, esp, eflags, ds, es, fs & gs; which are restored or overwritten by iret)
224	mov eax, [ebp + CPUMCTXCORE.eax]
225	mov ebx, [ebp + CPUMCTXCORE.ebx]
226	mov ecx, [ebp + CPUMCTXCORE.ecx]
227	mov edx, [ebp + CPUMCTXCORE.edx]
228	mov esi, [ebp + CPUMCTXCORE.esi]
229	mov edi, [ebp + CPUMCTXCORE.edi]
230	mov ebp, [ebp + CPUMCTXCORE.ebp]
231
232	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_IRET
233	iret
234	ENDPROC CPUMGCCallV86Code
235
236
237	;;
238	; This is a main entry point for resuming (or starting) guest
239	; code execution.
240	;
241	; We get here directly from VMMSwitcher.asm (jmp at the end
242	; of VMMSwitcher_HostToGuest).
243	;
244	; This call never returns!
245	;
246	; @param edx Pointer to CPUM structure.
247	;
248	align 16
249	BEGINPROC_EXPORTED CPUMGCResumeGuest
250	; Convert to CPUMCPU pointer
251	add edx, [edx + CPUM.ulOffCPUMCPU]
252	;
253	; Setup iretd
254	;
255	push dword [edx + CPUMCPU.Guest.ss]
256	push dword [edx + CPUMCPU.Guest.esp]
257	push dword [edx + CPUMCPU.Guest.eflags]
258	push dword [edx + CPUMCPU.Guest.cs]
259	push dword [edx + CPUMCPU.Guest.eip]
260
261	;
262	; Restore registers.
263	;
264	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_ES
265	mov es, [edx + CPUMCPU.Guest.es]
266	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_FS
267	mov fs, [edx + CPUMCPU.Guest.fs]
268	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_GS
269	mov gs, [edx + CPUMCPU.Guest.gs]
270
271	%ifdef VBOX_WITH_STATISTICS
272	;
273	; Statistics.
274	;
275	push edx
276	mov edx, IMP(g_VM)
277	lea edx, [edx + VM.StatTotalQemuToGC]
278	STAM_PROFILE_ADV_STOP edx
279
280	mov edx, IMP(g_VM)
281	lea edx, [edx + VM.StatTotalInGC]
282	STAM_PROFILE_ADV_START edx
283	pop edx
284	%endif
285
286	;
287	; enable WP
288	;
289	%ifdef ENABLE_WRITE_PROTECTION
290	mov eax, cr0
291	or eax, X86_CR0_WRITE_PROTECT
292	mov cr0, eax
293	%endif
294
295	;
296	; Continue restore.
297	;
298	mov esi, [edx + CPUMCPU.Guest.esi]
299	mov edi, [edx + CPUMCPU.Guest.edi]
300	mov ebp, [edx + CPUMCPU.Guest.ebp]
301	mov ebx, [edx + CPUMCPU.Guest.ebx]
302	mov ecx, [edx + CPUMCPU.Guest.ecx]
303	mov eax, [edx + CPUMCPU.Guest.eax]
304	push dword [edx + CPUMCPU.Guest.ds]
305	mov edx, [edx + CPUMCPU.Guest.edx]
306	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_DS
307	pop ds
308
309	; restart execution.
310	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_IRET
311	iretd
312	ENDPROC CPUMGCResumeGuest
313
314
315	;;
316	; This is a main entry point for resuming (or starting) guest
317	; code execution for raw V86 mode
318	;
319	; We get here directly from VMMSwitcher.asm (jmp at the end
320	; of VMMSwitcher_HostToGuest).
321	;
322	; This call never returns!
323	;
324	; @param edx Pointer to CPUM structure.
325	;
326	align 16
327	BEGINPROC_EXPORTED CPUMGCResumeGuestV86
328	; Convert to CPUMCPU pointer
329	add edx, [edx + CPUM.ulOffCPUMCPU]
330	;
331	; Setup iretd
332	;
333	push dword [edx + CPUMCPU.Guest.gs]
334	push dword [edx + CPUMCPU.Guest.fs]
335	push dword [edx + CPUMCPU.Guest.ds]
336	push dword [edx + CPUMCPU.Guest.es]
337
338	push dword [edx + CPUMCPU.Guest.ss]
339	push dword [edx + CPUMCPU.Guest.esp]
340
341	push dword [edx + CPUMCPU.Guest.eflags]
342	push dword [edx + CPUMCPU.Guest.cs]
343	push dword [edx + CPUMCPU.Guest.eip]
344
345	;
346	; Restore registers.
347	;
348
349	%ifdef VBOX_WITH_STATISTICS
350	;
351	; Statistics.
352	;
353	push edx
354	mov edx, IMP(g_VM)
355	lea edx, [edx + VM.StatTotalQemuToGC]
356	STAM_PROFILE_ADV_STOP edx
357
358	mov edx, IMP(g_VM)
359	lea edx, [edx + VM.StatTotalInGC]
360	STAM_PROFILE_ADV_START edx
361	pop edx
362	%endif
363
364	;
365	; enable WP
366	;
367	%ifdef ENABLE_WRITE_PROTECTION
368	mov eax, cr0
369	or eax, X86_CR0_WRITE_PROTECT
370	mov cr0, eax
371	%endif
372
373	;
374	; Continue restore.
375	;
376	mov esi, [edx + CPUMCPU.Guest.esi]
377	mov edi, [edx + CPUMCPU.Guest.edi]
378	mov ebp, [edx + CPUMCPU.Guest.ebp]
379	mov ecx, [edx + CPUMCPU.Guest.ecx]
380	mov ebx, [edx + CPUMCPU.Guest.ebx]
381	mov eax, [edx + CPUMCPU.Guest.eax]
382	mov edx, [edx + CPUMCPU.Guest.edx]
383
384	; restart execution.
385	TRPM_NP_GP_HANDLER NAME(cpumGCHandleNPAndGP), CPUM_HANDLER_IRET
386	iretd
387	ENDPROC CPUMGCResumeGuestV86
388

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source: vbox/trunk/src/VBox/VMM/VMMGC/CPUMGCA.asm@ 28800

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