CPUMR0A.asm@ 20540

Last change on this file since 20540 was 20540, checked in by vboxsync, 15 years ago
CPUMR0A.asm: More pushf;cli ... popf paranoia.
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1	; $Id: CPUMR0A.asm 20540 2009-06-13 21:23:51Z vboxsync $
2	;; @file
3	; CPUM - Guest Context Assembly Routines.
4	;
5
6	;
7	; Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	; Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	; Clara, CA 95054 USA or visit http://www.sun.com if you need
19	; additional information or have any questions.
20	;
21
22	;*******************************************************************************
23	;* Header Files *
24	;*******************************************************************************
25	%include "VBox/asmdefs.mac"
26	%include "VBox/vm.mac"
27	%include "VBox/err.mac"
28	%include "VBox/stam.mac"
29	%include "CPUMInternal.mac"
30	%include "VBox/x86.mac"
31	%include "VBox/cpum.mac"
32
33	%ifdef IN_RING3
34	%error "The jump table doesn't link on leopard."
35	%endif
36
37
38	;*******************************************************************************
39	;* External Symbols *
40	;*******************************************************************************
41	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
42	extern NAME(SUPR0AbsIs64bit)
43	extern NAME(SUPR0Abs64bitKernelCS)
44	extern NAME(SUPR0Abs64bitKernelSS)
45	extern NAME(SUPR0Abs64bitKernelDS)
46	extern NAME(SUPR0AbsKernelCS)
47	%endif
48
49
50	;*******************************************************************************
51	;* Global Variables *
52	;*******************************************************************************
53	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
54	BEGINDATA
55	;;
56	; Store the SUPR0AbsIs64bit absolute value here so we can cmp/test without
57	; needing to clobber a register. (This trick doesn't quite work for PE btw.
58	; but that's not relevant atm.)
59	GLOBALNAME g_fCPUMIs64bitHost
60	dd NAME(SUPR0AbsIs64bit)
61	%endif
62
63
64	BEGINCODE
65
66
67	;;
68	; Saves the host FPU/XMM state and restores the guest state.
69	;
70	; @returns 0
71	; @param pCPUMCPU x86:[esp+4] GCC:rdi MSC:rcx CPUMCPU pointer
72	;
73	align 16
74	BEGINPROC cpumR0SaveHostRestoreGuestFPUState
75	%ifdef RT_ARCH_AMD64
76	%ifdef RT_OS_WINDOWS
77	mov xDX, rcx
78	%else
79	mov xDX, rdi
80	%endif
81	%else
82	mov xDX, dword [esp + 4]
83	%endif
84	pushf ; The darwin kernel can get upset or upset things if an
85	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
86
87	; Switch the state.
88	or dword [xDX + CPUMCPU.fUseFlags], (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)
89
90	mov xAX, cr0 ; Make sure its safe to access the FPU state.
91	mov xCX, xAX ; save old CR0
92	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
93	mov cr0, xAX ;; @todo optimize this.
94
95	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
96	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
97	jz .legacy_mode
98	db 0xea ; jmp far .sixtyfourbit_mode
99	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
100	.legacy_mode:
101	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
102
103	fxsave [xDX + CPUMCPU.Host.fpu] ; ASSUMES that all VT-x/AMD-V boxes sports fxsave/fxrstor (safe assumption)
104	fxrstor [xDX + CPUMCPU.Guest.fpu]
105
106	.done:
107	mov cr0, xCX ; and restore old CR0 again ;; @todo optimize this.
108	popf
109	xor eax, eax
110	ret
111
112	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
113	ALIGNCODE(16)
114	BITS 64
115	.sixtyfourbit_mode:
116	and edx, 0ffffffffh
117	fxsave [rdx + CPUMCPU.Host.fpu]
118	fxrstor [rdx + CPUMCPU.Guest.fpu]
119	jmp far [.fpret wrt rip]
120	.fpret: ; 16:32 Pointer to .the_end.
121	dd .done, NAME(SUPR0AbsKernelCS)
122	BITS 32
123	%endif
124	ENDPROC cpumR0SaveHostRestoreGuestFPUState
125
126
127	%ifndef RT_ARCH_AMD64
128	%ifdef VBOX_WITH_64_BITS_GUESTS
129	%ifndef VBOX_WITH_HYBRID_32BIT_KERNEL
130	;;
131	; Saves the host FPU/XMM state
132	;
133	; @returns 0
134	; @param pCPUMCPU x86:[esp+4] GCC:rdi MSC:rcx CPUMCPU pointer
135	;
136	align 16
137	BEGINPROC cpumR0SaveHostFPUState
138	mov xDX, dword [esp + 4]
139	pushf ; The darwin kernel can get upset or upset things if an
140	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
141
142	; Switch the state.
143	or dword [xDX + CPUMCPU.fUseFlags], (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)
144
145	mov xAX, cr0 ; Make sure its safe to access the FPU state.
146	mov xCX, xAX ; save old CR0
147	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
148	mov cr0, xAX ;; @todo optimize this.
149
150	fxsave [xDX + CPUMCPU.Host.fpu] ; ASSUMES that all VT-x/AMD-V boxes sports fxsave/fxrstor (safe assumption)
151
152	mov cr0, xCX ; and restore old CR0 again ;; @todo optimize this.
153	popf
154	xor eax, eax
155	ret
156	ENDPROC cpumR0SaveHostFPUState
157	%endif
158	%endif
159	%endif
160
161
162	;;
163	; Saves the guest FPU/XMM state and restores the host state.
164	;
165	; @returns 0
166	; @param pCPUMCPU x86:[esp+4] GCC:rdi MSC:rcx CPUMCPU pointer
167	;
168	align 16
169	BEGINPROC cpumR0SaveGuestRestoreHostFPUState
170	%ifdef RT_ARCH_AMD64
171	%ifdef RT_OS_WINDOWS
172	mov xDX, rcx
173	%else
174	mov xDX, rdi
175	%endif
176	%else
177	mov xDX, dword [esp + 4]
178	%endif
179
180	; Only restore FPU if guest has used it.
181	; Using fxrstor should ensure that we're not causing unwanted exception on the host.
182	test dword [xDX + CPUMCPU.fUseFlags], CPUM_USED_FPU
183	jz short .fpu_not_used
184
185	pushf ; The darwin kernel can get upset or upset things if an
186	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
187
188	mov xAX, cr0 ; Make sure it's safe to access the FPU state.
189	mov xCX, xAX ; save old CR0
190	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
191	mov cr0, xAX ;; @todo optimize this.
192
193	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
194	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
195	jz .legacy_mode
196	db 0xea ; jmp far .sixtyfourbit_mode
197	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
198	.legacy_mode:
199	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
200
201	fxsave [xDX + CPUMCPU.Guest.fpu] ; ASSUMES that all VT-x/AMD-V boxes sports fxsave/fxrstor (safe assumption)
202	fxrstor [xDX + CPUMCPU.Host.fpu]
203
204	.done:
205	mov cr0, xCX ; and restore old CR0 again ;; @todo optimize this.
206	and dword [xDX + CPUMCPU.fUseFlags], ~CPUM_USED_FPU
207	popf
208	.fpu_not_used:
209	xor eax, eax
210	ret
211
212	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
213	ALIGNCODE(16)
214	BITS 64
215	.sixtyfourbit_mode:
216	and edx, 0ffffffffh
217	fxsave [rdx + CPUMCPU.Guest.fpu]
218	fxrstor [rdx + CPUMCPU.Host.fpu]
219	jmp far [.fpret wrt rip]
220	.fpret: ; 16:32 Pointer to .the_end.
221	dd .done, NAME(SUPR0AbsKernelCS)
222	BITS 32
223	%endif
224	ENDPROC cpumR0SaveGuestRestoreHostFPUState
225
226
227	;;
228	; Sets the host's FPU/XMM state
229	;
230	; @returns 0
231	; @param pCPUMCPU x86:[esp+4] GCC:rdi MSC:rcx CPUMCPU pointer
232	;
233	align 16
234	BEGINPROC cpumR0RestoreHostFPUState
235	%ifdef RT_ARCH_AMD64
236	%ifdef RT_OS_WINDOWS
237	mov xDX, rcx
238	%else
239	mov xDX, rdi
240	%endif
241	%else
242	mov xDX, dword [esp + 4]
243	%endif
244
245	; Restore FPU if guest has used it.
246	; Using fxrstor should ensure that we're not causing unwanted exception on the host.
247	test dword [xDX + CPUMCPU.fUseFlags], CPUM_USED_FPU
248	jz short .fpu_not_used
249
250	pushf ; The darwin kernel can get upset or upset things if an
251	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
252
253	mov xAX, cr0
254	mov xCX, xAX ; save old CR0
255	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
256	mov cr0, xAX
257
258	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
259	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
260	jz .legacy_mode
261	db 0xea ; jmp far .sixtyfourbit_mode
262	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
263	.legacy_mode:
264	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
265
266	fxrstor [xDX + CPUMCPU.Host.fpu]
267
268	.done:
269	mov cr0, xCX ; and restore old CR0 again
270	and dword [xDX + CPUMCPU.fUseFlags], ~CPUM_USED_FPU
271	popf
272	.fpu_not_used:
273	xor eax, eax
274	ret
275
276	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
277	ALIGNCODE(16)
278	BITS 64
279	.sixtyfourbit_mode:
280	and edx, 0ffffffffh
281	fxrstor [rdx + CPUMCPU.Host.fpu]
282	jmp far [.fpret wrt rip]
283	.fpret: ; 16:32 Pointer to .the_end.
284	dd .done, NAME(SUPR0AbsKernelCS)
285	BITS 32
286	%endif
287	ENDPROC cpumR0RestoreHostFPUState
288
289
290	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
291	;;
292	; DECLASM(void) cpumR0SaveDRx(uint64_t *pa4Regs);
293	;
294	ALIGNCODE(16)
295	BEGINPROC cpumR0SaveDRx
296	%ifdef RT_ARCH_AMD64
297	%ifdef ASM_CALL64_GCC
298	mov xCX, rdi
299	%endif
300	%else
301	mov xCX, dword [esp + 4]
302	%endif
303	pushf ; Just to be on the safe side.
304	cli
305	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
306	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
307	jz .legacy_mode
308	db 0xea ; jmp far .sixtyfourbit_mode
309	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
310	.legacy_mode:
311	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
312
313	;
314	; Do the job.
315	;
316	mov xAX, dr0
317	mov xDX, dr1
318	mov [xCX], xAX
319	mov [xCX + 8 * 1], xDX
320	mov xAX, dr2
321	mov xDX, dr3
322	mov [xCX + 8 * 2], xAX
323	mov [xCX + 8 * 3], xDX
324
325	.done:
326	popf
327	ret
328
329	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
330	ALIGNCODE(16)
331	BITS 64
332	.sixtyfourbit_mode:
333	and ecx, 0ffffffffh
334
335	mov rax, dr0
336	mov rdx, dr1
337	mov r8, dr2
338	mov r9, dr3
339	mov [rcx], rax
340	mov [rcx + 8 * 1], rdx
341	mov [rcx + 8 * 2], r8
342	mov [rcx + 8 * 3], r9
343	jmp far [.fpret wrt rip]
344	.fpret: ; 16:32 Pointer to .the_end.
345	dd .done, NAME(SUPR0AbsKernelCS)
346	BITS 32
347	%endif
348	ENDPROC cpumR0SaveDRx
349
350
351	;;
352	; DECLASM(void) cpumR0LoadDRx(uint64_t const *pa4Regs);
353	;
354	ALIGNCODE(16)
355	BEGINPROC cpumR0LoadDRx
356	%ifdef RT_ARCH_AMD64
357	%ifdef ASM_CALL64_GCC
358	mov xCX, rdi
359	%endif
360	%else
361	mov xCX, dword [esp + 4]
362	%endif
363	pushf ; Just to be on the safe side.
364	cli
365	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
366	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
367	jz .legacy_mode
368	db 0xea ; jmp far .sixtyfourbit_mode
369	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
370	.legacy_mode:
371	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
372
373	;
374	; Do the job.
375	;
376	mov xAX, [xCX]
377	mov xDX, [xCX + 8 * 1]
378	mov dr0, xAX
379	mov dr1, xDX
380	mov xAX, [xCX + 8 * 2]
381	mov xDX, [xCX + 8 * 3]
382	mov dr2, xAX
383	mov dr3, xDX
384
385	.done:
386	popf
387	ret
388
389	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
390	ALIGNCODE(16)
391	BITS 64
392	.sixtyfourbit_mode:
393	and ecx, 0ffffffffh
394
395	mov rax, [rcx]
396	mov rdx, [rcx + 8 * 1]
397	mov r8, [rcx + 8 * 2]
398	mov r9, [rcx + 8 * 3]
399	mov dr0, rax
400	mov dr1, rdx
401	mov dr2, r8
402	mov dr3, r9
403	jmp far [.fpret wrt rip]
404	.fpret: ; 16:32 Pointer to .the_end.
405	dd .done, NAME(SUPR0AbsKernelCS)
406	BITS 32
407	%endif
408	ENDPROC cpumR0LoadDRx
409
410	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
411

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source: vbox/trunk/src/VBox/VMM/VMMR0/CPUMR0A.asm@ 20540

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