CPUMR0A.asm@ 52023

Last change on this file since 52023 was 50661, checked in by vboxsync, 11 years ago
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1	; $Id: CPUMR0A.asm 50661 2014-03-03 09:06:19Z vboxsync $
2	;; @file
3	; CPUM - Guest Context Assembly Routines.
4	;
5
6	;
7	; Copyright (C) 2006-2013 Oracle Corporation
8	;
9	; This file is part of VirtualBox Open Source Edition (OSE), as
10	; available from http://www.virtualbox.org. This file is free software;
11	; you can redistribute it and/or modify it under the terms of the GNU
12	; General Public License (GPL) as published by the Free Software
13	; Foundation, in version 2 as it comes in the "COPYING" file of the
14	; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	;
17
18	;*******************************************************************************
19	;* Header Files *
20	;*******************************************************************************
21	%include "VBox/asmdefs.mac"
22	%include "VBox/vmm/vm.mac"
23	%include "VBox/err.mac"
24	%include "VBox/vmm/stam.mac"
25	%include "CPUMInternal.mac"
26	%include "iprt/x86.mac"
27	%include "VBox/vmm/cpum.mac"
28
29	%ifdef IN_RING3
30	%error "The jump table doesn't link on leopard."
31	%endif
32
33	;*******************************************************************************
34	;* Defined Constants And Macros *
35	;*******************************************************************************
36	;; The offset of the XMM registers in X86FXSTATE.
37	; Use define because I'm too lazy to convert the struct.
38	%define XMM_OFF_IN_X86FXSTATE 160
39
40
41	;*******************************************************************************
42	;* External Symbols *
43	;*******************************************************************************
44	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
45	extern NAME(SUPR0AbsIs64bit)
46	extern NAME(SUPR0Abs64bitKernelCS)
47	extern NAME(SUPR0Abs64bitKernelSS)
48	extern NAME(SUPR0Abs64bitKernelDS)
49	extern NAME(SUPR0AbsKernelCS)
50	%endif
51
52
53	;*******************************************************************************
54	;* Global Variables *
55	;*******************************************************************************
56	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
57	BEGINDATA
58	;;
59	; Store the SUPR0AbsIs64bit absolute value here so we can cmp/test without
60	; needing to clobber a register. (This trick doesn't quite work for PE btw.
61	; but that's not relevant atm.)
62	GLOBALNAME g_fCPUMIs64bitHost
63	dd NAME(SUPR0AbsIs64bit)
64	%endif
65
66
67	BEGINCODE
68
69	;; Macro for FXSAVE/FXRSTOR leaky behaviour on AMD CPUs, see cpumR3CheckLeakyFpu().
70	; Cleans the FPU state, if necessary, before restoring the FPU.
71	;
72	; This macro ASSUMES CR0.TS is not set!
73	; @remarks Trashes xAX!!
74	; Changes here should also be reflected in CPUMRCA.asm's copy!
75	%macro CLEANFPU 0
76	test dword [xDX + CPUMCPU.fUseFlags], CPUM_USE_FFXSR_LEAKY
77	jz .nothing_to_clean
78
79	xor eax, eax
80	fnstsw ax ; Get FSW
81	test eax, RT_BIT(7) ; If FSW.ES (bit 7) is set, clear it to not cause FPU exceptions
82	; while clearing & loading the FPU bits in 'clean_fpu'
83	jz .clean_fpu
84	fnclex
85
86	.clean_fpu:
87	ffree st7 ; Clear FPU stack register(7)'s tag entry to prevent overflow if a wraparound occurs
88	; for the upcoming push (load)
89	fild dword [xDX + CPUMCPU.Guest.fpu] ; Explicit FPU load to overwrite FIP, FOP, FDP registers in the FPU.
90
91	.nothing_to_clean:
92	%endmacro
93
94	;; Macro to save and modify CR0 (if necessary) before touching the FPU state
95	; so as to not cause any FPU exceptions.
96	;
97	; @remarks Uses xCX for backing-up CR0 (if CR0 needs to be modified) otherwise clears xCX.
98	; @remarks Trashes xAX.
99	%macro SAVE_CR0_CLEAR_FPU_TRAPS 0
100	xor ecx, ecx
101	mov xAX, cr0
102	test eax, X86_CR0_TS \| X86_CR0_EM ; Make sure its safe to access the FPU state.
103	jz %%skip_cr0_write
104	mov xCX, xAX ; Save old CR0
105	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
106	mov cr0, xAX
107	%%skip_cr0_write:
108	%endmacro
109
110	;; Macro to restore CR0 from xCX if necessary.
111	;
112	; @remarks xCX should contain the CR0 value to restore or 0 if no restoration is needed.
113	%macro RESTORE_CR0 0
114	cmp ecx, 0
115	je %%skip_cr0_restore
116	mov cr0, xCX
117	%%skip_cr0_restore:
118	%endmacro
119
120	;;
121	; Saves the host FPU/XMM state and restores the guest state.
122	;
123	; @returns 0
124	; @param pCPUMCPU x86:[esp+4] gcc:rdi msc:rcx CPUMCPU pointer
125	;
126	align 16
127	BEGINPROC cpumR0SaveHostRestoreGuestFPUState
128	%ifdef RT_ARCH_AMD64
129	%ifdef RT_OS_WINDOWS
130	mov xDX, rcx
131	%else
132	mov xDX, rdi
133	%endif
134	%else
135	mov xDX, dword [esp + 4]
136	%endif
137	pushf ; The darwin kernel can get upset or upset things if an
138	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
139
140	; Switch the state.
141	or dword [xDX + CPUMCPU.fUseFlags], (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)
142
143	; Clear CR0 FPU bits to not cause exceptions, uses xCX
144	SAVE_CR0_CLEAR_FPU_TRAPS
145	; Do NOT use xCX from this point!
146
147	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
148	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
149	jz .legacy_mode
150	db 0xea ; jmp far .sixtyfourbit_mode
151	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
152	.legacy_mode:
153	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
154
155	%ifdef RT_ARCH_AMD64
156	; Use explicit REX prefix. See @bugref{6398}.
157	o64 fxsave [xDX + CPUMCPU.Host.fpu] ; ASSUMES that all VT-x/AMD-V boxes sports fxsave/fxrstor (safe assumption)
158	o64 fxrstor [xDX + CPUMCPU.Guest.fpu]
159	%else
160	fxsave [xDX + CPUMCPU.Host.fpu] ; ASSUMES that all VT-x/AMD-V boxes sports fxsave/fxrstor (safe assumption)
161	fxrstor [xDX + CPUMCPU.Guest.fpu]
162	%endif
163
164	%ifdef VBOX_WITH_KERNEL_USING_XMM
165	; Restore the non-volatile xmm registers. ASSUMING 64-bit windows
166	lea r11, [xDX + CPUMCPU.Host.fpu + XMM_OFF_IN_X86FXSTATE]
167	movdqa xmm6, [r11 + 060h]
168	movdqa xmm7, [r11 + 070h]
169	movdqa xmm8, [r11 + 080h]
170	movdqa xmm9, [r11 + 090h]
171	movdqa xmm10, [r11 + 0a0h]
172	movdqa xmm11, [r11 + 0b0h]
173	movdqa xmm12, [r11 + 0c0h]
174	movdqa xmm13, [r11 + 0d0h]
175	movdqa xmm14, [r11 + 0e0h]
176	movdqa xmm15, [r11 + 0f0h]
177	%endif
178
179	.done:
180	; Restore CR0 from xCX if it was previously saved.
181	RESTORE_CR0
182	popf
183	xor eax, eax
184	ret
185
186	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
187	ALIGNCODE(16)
188	BITS 64
189	.sixtyfourbit_mode:
190	and edx, 0ffffffffh
191	o64 fxsave [rdx + CPUMCPU.Host.fpu]
192	o64 fxrstor [rdx + CPUMCPU.Guest.fpu]
193	jmp far [.fpret wrt rip]
194	.fpret: ; 16:32 Pointer to .the_end.
195	dd .done, NAME(SUPR0AbsKernelCS)
196	BITS 32
197	%endif
198	ENDPROC cpumR0SaveHostRestoreGuestFPUState
199
200
201	%ifndef RT_ARCH_AMD64
202	%ifdef VBOX_WITH_64_BITS_GUESTS
203	%ifndef VBOX_WITH_HYBRID_32BIT_KERNEL
204	;;
205	; Saves the host FPU/XMM state
206	;
207	; @returns 0
208	; @param pCPUMCPU x86:[esp+4] gcc:rdi msc:rcx CPUMCPU pointer
209	;
210	align 16
211	BEGINPROC cpumR0SaveHostFPUState
212	mov xDX, dword [esp + 4]
213	pushf ; The darwin kernel can get upset or upset things if an
214	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
215
216	; Switch the state.
217	or dword [xDX + CPUMCPU.fUseFlags], (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)
218
219	; Clear CR0 FPU bits to not cause exceptions, uses xCX
220	SAVE_CR0_CLEAR_FPU_TRAPS
221	; Do NOT use xCX from this point!
222
223	fxsave [xDX + CPUMCPU.Host.fpu] ; ASSUMES that all VT-x/AMD-V boxes support fxsave/fxrstor (safe assumption)
224
225	; Restore CR0 from xCX if it was saved previously.
226	RESTORE_CR0
227
228	popf
229	xor eax, eax
230	ret
231	ENDPROC cpumR0SaveHostFPUState
232	%endif
233	%endif
234	%endif
235
236
237	;;
238	; Saves the guest FPU/XMM state and restores the host state.
239	;
240	; @returns 0
241	; @param pCPUMCPU x86:[esp+4] gcc:rdi msc:rcx CPUMCPU pointer
242	;
243	align 16
244	BEGINPROC cpumR0SaveGuestRestoreHostFPUState
245	%ifdef RT_ARCH_AMD64
246	%ifdef RT_OS_WINDOWS
247	mov xDX, rcx
248	%else
249	mov xDX, rdi
250	%endif
251	%else
252	mov xDX, dword [esp + 4]
253	%endif
254
255	; Only restore FPU if guest has used it.
256	; Using fxrstor should ensure that we're not causing unwanted exception on the host.
257	test dword [xDX + CPUMCPU.fUseFlags], CPUM_USED_FPU
258	jz short .fpu_not_used
259
260	pushf ; The darwin kernel can get upset or upset things if an
261	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
262
263	; Clear CR0 FPU bits to not cause exceptions, uses xCX
264	SAVE_CR0_CLEAR_FPU_TRAPS
265	; Do NOT use xCX from this point!
266
267	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
268	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
269	jz .legacy_mode
270	db 0xea ; jmp far .sixtyfourbit_mode
271	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
272	.legacy_mode:
273	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
274
275	%ifdef RT_ARCH_AMD64
276	; Use explicit REX prefix. See @bugref{6398}.
277	o64 fxsave [xDX + CPUMCPU.Guest.fpu] ; ASSUMES that all VT-x/AMD-V boxes support fxsave/fxrstor (safe assumption)
278	o64 fxrstor [xDX + CPUMCPU.Host.fpu]
279	%else
280	fxsave [xDX + CPUMCPU.Guest.fpu] ; ASSUMES that all VT-x/AMD-V boxes support fxsave/fxrstor (safe assumption)
281	fxrstor [xDX + CPUMCPU.Host.fpu]
282	%endif
283
284	.done:
285	; Restore CR0 from xCX if it was previously saved.
286	RESTORE_CR0
287	and dword [xDX + CPUMCPU.fUseFlags], ~CPUM_USED_FPU
288	popf
289	.fpu_not_used:
290	xor eax, eax
291	ret
292
293	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
294	ALIGNCODE(16)
295	BITS 64
296	.sixtyfourbit_mode:
297	and edx, 0ffffffffh
298	o64 fxsave [rdx + CPUMCPU.Guest.fpu]
299	o64 fxrstor [rdx + CPUMCPU.Host.fpu]
300	jmp far [.fpret wrt rip]
301	.fpret: ; 16:32 Pointer to .the_end.
302	dd .done, NAME(SUPR0AbsKernelCS)
303	BITS 32
304	%endif
305	ENDPROC cpumR0SaveGuestRestoreHostFPUState
306
307
308	;;
309	; Sets the host's FPU/XMM state
310	;
311	; @returns 0
312	; @param pCPUMCPU x86:[esp+4] gcc:rdi msc:rcx CPUMCPU pointer
313	;
314	align 16
315	BEGINPROC cpumR0RestoreHostFPUState
316	%ifdef RT_ARCH_AMD64
317	%ifdef RT_OS_WINDOWS
318	mov xDX, rcx
319	%else
320	mov xDX, rdi
321	%endif
322	%else
323	mov xDX, dword [esp + 4]
324	%endif
325
326	; Restore FPU if guest has used it.
327	; Using fxrstor should ensure that we're not causing unwanted exception on the host.
328	test dword [xDX + CPUMCPU.fUseFlags], CPUM_USED_FPU
329	jz short .fpu_not_used
330
331	pushf ; The darwin kernel can get upset or upset things if an
332	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
333
334	; Clear CR0 FPU bits to not cause exceptions, uses xCX
335	SAVE_CR0_CLEAR_FPU_TRAPS
336	; Do NOT use xCX from this point!
337
338	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
339	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
340	jz .legacy_mode
341	db 0xea ; jmp far .sixtyfourbit_mode
342	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
343	.legacy_mode:
344	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
345
346	%ifdef RT_ARCH_AMD64
347	o64 fxrstor [xDX + CPUMCPU.Host.fpu]
348	%else
349	fxrstor [xDX + CPUMCPU.Host.fpu]
350	%endif
351
352	.done:
353	; Restore CR0 from xCX if it was previously saved.
354	RESTORE_CR0
355	and dword [xDX + CPUMCPU.fUseFlags], ~CPUM_USED_FPU
356	popf
357	.fpu_not_used:
358	xor eax, eax
359	ret
360
361	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
362	ALIGNCODE(16)
363	BITS 64
364	.sixtyfourbit_mode:
365	and edx, 0ffffffffh
366	o64 fxrstor [rdx + CPUMCPU.Host.fpu]
367	jmp far [.fpret wrt rip]
368	.fpret: ; 16:32 Pointer to .the_end.
369	dd .done, NAME(SUPR0AbsKernelCS)
370	BITS 32
371	%endif
372	ENDPROC cpumR0RestoreHostFPUState
373
374
375	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
376	;;
377	; DECLASM(void) cpumR0SaveDRx(uint64_t *pa4Regs);
378	;
379	ALIGNCODE(16)
380	BEGINPROC cpumR0SaveDRx
381	%ifdef RT_ARCH_AMD64
382	%ifdef ASM_CALL64_GCC
383	mov xCX, rdi
384	%endif
385	%else
386	mov xCX, dword [esp + 4]
387	%endif
388	pushf ; Just to be on the safe side.
389	cli
390	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
391	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
392	jz .legacy_mode
393	db 0xea ; jmp far .sixtyfourbit_mode
394	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
395	.legacy_mode:
396	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
397
398	;
399	; Do the job.
400	;
401	mov xAX, dr0
402	mov xDX, dr1
403	mov [xCX], xAX
404	mov [xCX + 8 * 1], xDX
405	mov xAX, dr2
406	mov xDX, dr3
407	mov [xCX + 8 * 2], xAX
408	mov [xCX + 8 * 3], xDX
409
410	.done:
411	popf
412	ret
413
414	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
415	ALIGNCODE(16)
416	BITS 64
417	.sixtyfourbit_mode:
418	and ecx, 0ffffffffh
419
420	mov rax, dr0
421	mov rdx, dr1
422	mov r8, dr2
423	mov r9, dr3
424	mov [rcx], rax
425	mov [rcx + 8 * 1], rdx
426	mov [rcx + 8 * 2], r8
427	mov [rcx + 8 * 3], r9
428	jmp far [.fpret wrt rip]
429	.fpret: ; 16:32 Pointer to .the_end.
430	dd .done, NAME(SUPR0AbsKernelCS)
431	BITS 32
432	%endif
433	ENDPROC cpumR0SaveDRx
434
435
436	;;
437	; DECLASM(void) cpumR0LoadDRx(uint64_t const *pa4Regs);
438	;
439	ALIGNCODE(16)
440	BEGINPROC cpumR0LoadDRx
441	%ifdef RT_ARCH_AMD64
442	%ifdef ASM_CALL64_GCC
443	mov xCX, rdi
444	%endif
445	%else
446	mov xCX, dword [esp + 4]
447	%endif
448	pushf ; Just to be on the safe side.
449	cli
450	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
451	cmp byte [NAME(g_fCPUMIs64bitHost)], 0
452	jz .legacy_mode
453	db 0xea ; jmp far .sixtyfourbit_mode
454	dd .sixtyfourbit_mode, NAME(SUPR0Abs64bitKernelCS)
455	.legacy_mode:
456	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL
457
458	;
459	; Do the job.
460	;
461	mov xAX, [xCX]
462	mov xDX, [xCX + 8 * 1]
463	mov dr0, xAX
464	mov dr1, xDX
465	mov xAX, [xCX + 8 * 2]
466	mov xDX, [xCX + 8 * 3]
467	mov dr2, xAX
468	mov dr3, xDX
469
470	.done:
471	popf
472	ret
473
474	%ifdef VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
475	ALIGNCODE(16)
476	BITS 64
477	.sixtyfourbit_mode:
478	and ecx, 0ffffffffh
479
480	mov rax, [rcx]
481	mov rdx, [rcx + 8 * 1]
482	mov r8, [rcx + 8 * 2]
483	mov r9, [rcx + 8 * 3]
484	mov dr0, rax
485	mov dr1, rdx
486	mov dr2, r8
487	mov dr3, r9
488	jmp far [.fpret wrt rip]
489	.fpret: ; 16:32 Pointer to .the_end.
490	dd .done, NAME(SUPR0AbsKernelCS)
491	BITS 32
492	%endif
493	ENDPROC cpumR0LoadDRx
494
495	%endif ; VBOX_WITH_HYBRID_32BIT_KERNEL_IN_R0
496

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