CPUMR0A.asm@ 87361

Last change on this file since 87361 was 87361, checked in by vboxsync, 4 years ago
VMM/CPUM,HMSVM: Mirror the state of fUseFlags[CPUM_USED_FPU_GUEST] in CPUMCTX::fUsedFpuGuest so the HM switcher code can get at it (only relevant for windows) and avoid a call to CPUMIsGuestFPUStateActive/Loaded.
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1	; $Id: CPUMR0A.asm 87361 2021-01-21 21:13:55Z vboxsync $
2	;; @file
3	; CPUM - Ring-0 Assembly Routines (supporting HM and IEM).
4	;
5
6	;
7	; Copyright (C) 2006-2020 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	;*******************************************************************************
20	;* Header Files *
21	;*******************************************************************************
22	%define RT_ASM_WITH_SEH64
23	%include "iprt/asmdefs.mac"
24	%include "VBox/asmdefs.mac"
25	%include "VBox/vmm/vm.mac"
26	%include "VBox/err.mac"
27	%include "VBox/vmm/stam.mac"
28	%include "CPUMInternal.mac"
29	%include "iprt/x86.mac"
30	%include "VBox/vmm/cpum.mac"
31
32
33	BEGINCODE
34
35	;;
36	; Makes sure the EMTs have a FPU state associated with them on hosts where we're
37	; allowed to use it in ring-0 too.
38	;
39	; This ensure that we don't have to allocate the state lazily while trying to execute
40	; guest code with preemption disabled or worse.
41	;
42	; @cproto VMMR0_INT_DECL(void) CPUMR0RegisterVCpuThread(PVMCPU pVCpu);
43	;
44	BEGINPROC CPUMR0RegisterVCpuThread
45	push xBP
46	SEH64_PUSH_xBP
47	mov xBP, xSP
48	SEH64_SET_FRAME_xBP 0
49	SEH64_END_PROLOGUE
50
51	%ifdef VMM_R0_TOUCH_FPU
52	movdqa xmm0, xmm0 ; hope this is harmless.
53	%endif
54
55	.return:
56	xor eax, eax ; paranoia
57	leave
58	ret
59	ENDPROC CPUMR0RegisterVCpuThread
60
61
62	%ifdef VMM_R0_TOUCH_FPU
63	;;
64	; Touches the host FPU state.
65	;
66	; @uses nothing (well, maybe cr0)
67	;
68	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
69	ALIGNCODE(16)
70	%endif
71	BEGINPROC CPUMR0TouchHostFpu
72	push xBP
73	SEH64_PUSH_xBP
74	mov xBP, xSP
75	SEH64_SET_FRAME_xBP 0
76	SEH64_END_PROLOGUE
77
78	movdqa xmm0, xmm0 ; Hope this is harmless.
79
80	leave
81	ret
82	ENDPROC CPUMR0TouchHostFpu
83	%endif ; VMM_R0_TOUCH_FPU
84
85
86	;;
87	; Saves the host FPU/SSE/AVX state and restores the guest FPU/SSE/AVX state.
88	;
89	; @returns VINF_SUCCESS (0) or VINF_CPUM_HOST_CR0_MODIFIED. (EAX)
90	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
91	;
92	; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
93	; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
94	; However the compiler docs have different idea:
95	; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
96	; We'll go with the former for now.
97	;
98	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
99	ALIGNCODE(16)
100	%endif
101	BEGINPROC cpumR0SaveHostRestoreGuestFPUState
102	push xBP
103	SEH64_PUSH_xBP
104	mov xBP, xSP
105	SEH64_SET_FRAME_xBP 0
106	SEH64_END_PROLOGUE
107
108	;
109	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
110	;
111	%ifdef RT_ARCH_AMD64
112	%ifdef RT_OS_WINDOWS
113	mov r11, rcx
114	%else
115	mov r11, rdi
116	%endif
117	%define pCpumCpu r11
118	%define pXState r10
119	%else
120	push ebx
121	push esi
122	mov ebx, dword [ebp + 8]
123	%define pCpumCpu ebx
124	%define pXState esi
125	%endif
126
127	pushf ; The darwin kernel can get upset or upset things if an
128	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
129
130	;
131	; Save the host state.
132	;
133	test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_HOST
134	jnz .already_saved_host
135
136	CPUMRZ_TOUCH_FPU_CLEAR_CR0_FPU_TRAPS_SET_RC xCX, xAX, pCpumCpu ; xCX is the return value for VT-x; xAX is scratch.
137
138	CPUMR0_SAVE_HOST
139
140	%ifdef VBOX_WITH_KERNEL_USING_XMM
141	jmp .load_guest
142	%endif
143	.already_saved_host:
144	%ifdef VBOX_WITH_KERNEL_USING_XMM
145	; If we didn't save the host state, we must save the non-volatile XMM registers.
146	mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0]
147	stmxcsr [pXState + X86FXSTATE.MXCSR]
148	movdqa [pXState + X86FXSTATE.xmm6 ], xmm6
149	movdqa [pXState + X86FXSTATE.xmm7 ], xmm7
150	movdqa [pXState + X86FXSTATE.xmm8 ], xmm8
151	movdqa [pXState + X86FXSTATE.xmm9 ], xmm9
152	movdqa [pXState + X86FXSTATE.xmm10], xmm10
153	movdqa [pXState + X86FXSTATE.xmm11], xmm11
154	movdqa [pXState + X86FXSTATE.xmm12], xmm12
155	movdqa [pXState + X86FXSTATE.xmm13], xmm13
156	movdqa [pXState + X86FXSTATE.xmm14], xmm14
157	movdqa [pXState + X86FXSTATE.xmm15], xmm15
158
159	;
160	; Load the guest state.
161	;
162	.load_guest:
163	%endif
164	CPUMR0_LOAD_GUEST
165
166	%ifdef VBOX_WITH_KERNEL_USING_XMM
167	; Restore the non-volatile xmm registers. ASSUMING 64-bit host.
168	mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0]
169	movdqa xmm6, [pXState + X86FXSTATE.xmm6]
170	movdqa xmm7, [pXState + X86FXSTATE.xmm7]
171	movdqa xmm8, [pXState + X86FXSTATE.xmm8]
172	movdqa xmm9, [pXState + X86FXSTATE.xmm9]
173	movdqa xmm10, [pXState + X86FXSTATE.xmm10]
174	movdqa xmm11, [pXState + X86FXSTATE.xmm11]
175	movdqa xmm12, [pXState + X86FXSTATE.xmm12]
176	movdqa xmm13, [pXState + X86FXSTATE.xmm13]
177	movdqa xmm14, [pXState + X86FXSTATE.xmm14]
178	movdqa xmm15, [pXState + X86FXSTATE.xmm15]
179	ldmxcsr [pXState + X86FXSTATE.MXCSR]
180	%endif
181
182	or dword [pCpumCpu + CPUMCPU.fUseFlags], (CPUM_USED_FPU_GUEST \| CPUM_USED_FPU_SINCE_REM \| CPUM_USED_FPU_HOST)
183	mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 1
184	popf
185
186	mov eax, ecx
187	.return:
188	%ifdef RT_ARCH_X86
189	pop esi
190	pop ebx
191	%endif
192	leave
193	ret
194	ENDPROC cpumR0SaveHostRestoreGuestFPUState
195
196
197	;;
198	; Saves the guest FPU/SSE/AVX state and restores the host FPU/SSE/AVX state.
199	;
200	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
201	;
202	; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
203	; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
204	; However the compiler docs have different idea:
205	; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
206	; We'll go with the former for now.
207	;
208	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
209	ALIGNCODE(16)
210	%endif
211	BEGINPROC cpumR0SaveGuestRestoreHostFPUState
212	push xBP
213	SEH64_PUSH_xBP
214	mov xBP, xSP
215	SEH64_SET_FRAME_xBP 0
216	SEH64_END_PROLOGUE
217
218	;
219	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
220	;
221	%ifdef RT_ARCH_AMD64
222	%ifdef RT_OS_WINDOWS
223	mov r11, rcx
224	%else
225	mov r11, rdi
226	%endif
227	%define pCpumCpu r11
228	%define pXState r10
229	%else
230	push ebx
231	push esi
232	mov ebx, dword [ebp + 8]
233	%define pCpumCpu ebx
234	%define pXState esi
235	%endif
236	pushf ; The darwin kernel can get upset or upset things if an
237	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
238
239	%ifdef VBOX_WITH_KERNEL_USING_XMM
240	;
241	; Copy non-volatile XMM registers to the host state so we can use
242	; them while saving the guest state (we've gotta do this anyway).
243	;
244	mov pXState, [pCpumCpu + CPUMCPU.Host.pXStateR0]
245	stmxcsr [pXState + X86FXSTATE.MXCSR]
246	movdqa [pXState + X86FXSTATE.xmm6], xmm6
247	movdqa [pXState + X86FXSTATE.xmm7], xmm7
248	movdqa [pXState + X86FXSTATE.xmm8], xmm8
249	movdqa [pXState + X86FXSTATE.xmm9], xmm9
250	movdqa [pXState + X86FXSTATE.xmm10], xmm10
251	movdqa [pXState + X86FXSTATE.xmm11], xmm11
252	movdqa [pXState + X86FXSTATE.xmm12], xmm12
253	movdqa [pXState + X86FXSTATE.xmm13], xmm13
254	movdqa [pXState + X86FXSTATE.xmm14], xmm14
255	movdqa [pXState + X86FXSTATE.xmm15], xmm15
256	%endif
257
258	;
259	; Save the guest state if necessary.
260	;
261	test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_GUEST
262	jz .load_only_host
263
264	%ifdef VBOX_WITH_KERNEL_USING_XMM
265	; Load the guest XMM register values we already saved in HMR0VMXStartVMWrapXMM.
266	mov pXState, [pCpumCpu + CPUMCPU.Guest.pXStateR0]
267	movdqa xmm0, [pXState + X86FXSTATE.xmm0]
268	movdqa xmm1, [pXState + X86FXSTATE.xmm1]
269	movdqa xmm2, [pXState + X86FXSTATE.xmm2]
270	movdqa xmm3, [pXState + X86FXSTATE.xmm3]
271	movdqa xmm4, [pXState + X86FXSTATE.xmm4]
272	movdqa xmm5, [pXState + X86FXSTATE.xmm5]
273	movdqa xmm6, [pXState + X86FXSTATE.xmm6]
274	movdqa xmm7, [pXState + X86FXSTATE.xmm7]
275	movdqa xmm8, [pXState + X86FXSTATE.xmm8]
276	movdqa xmm9, [pXState + X86FXSTATE.xmm9]
277	movdqa xmm10, [pXState + X86FXSTATE.xmm10]
278	movdqa xmm11, [pXState + X86FXSTATE.xmm11]
279	movdqa xmm12, [pXState + X86FXSTATE.xmm12]
280	movdqa xmm13, [pXState + X86FXSTATE.xmm13]
281	movdqa xmm14, [pXState + X86FXSTATE.xmm14]
282	movdqa xmm15, [pXState + X86FXSTATE.xmm15]
283	ldmxcsr [pXState + X86FXSTATE.MXCSR]
284	%endif
285	CPUMR0_SAVE_GUEST
286
287	;
288	; Load the host state.
289	;
290	.load_only_host:
291	CPUMR0_LOAD_HOST
292
293	; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
294	; in cpumRZSaveHostFPUState.
295	mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
296	CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
297	and dword [pCpumCpu + CPUMCPU.fUseFlags], ~(CPUM_USED_FPU_GUEST \| CPUM_USED_FPU_HOST)
298	mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 0
299
300	popf
301	%ifdef RT_ARCH_X86
302	pop esi
303	pop ebx
304	%endif
305	leave
306	ret
307	%undef pCpumCpu
308	%undef pXState
309	ENDPROC cpumR0SaveGuestRestoreHostFPUState
310
311
312	%if ARCH_BITS == 32
313	%ifdef VBOX_WITH_64_BITS_GUESTS
314	;;
315	; Restores the host's FPU/SSE/AVX state from pCpumCpu->Host.
316	;
317	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
318	;
319	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
320	ALIGNCODE(16)
321	%endif
322	BEGINPROC cpumR0RestoreHostFPUState
323	;
324	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
325	;
326	push ebp
327	mov ebp, esp
328	push ebx
329	push esi
330	mov ebx, dword [ebp + 8]
331	%define pCpumCpu ebx
332	%define pXState esi
333
334	;
335	; Restore host CPU state.
336	;
337	pushf ; The darwin kernel can get upset or upset things if an
338	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
339
340	CPUMR0_LOAD_HOST
341
342	; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
343	; in cpumRZSaveHostFPUState.
344	;; @todo What about XCR0?
345	mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
346	CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
347
348	and dword [pCpumCpu + CPUMCPU.fUseFlags], ~CPUM_USED_FPU_HOST
349	popf
350
351	pop esi
352	pop ebx
353	leave
354	ret
355	%undef pCpumCPu
356	%undef pXState
357	ENDPROC cpumR0RestoreHostFPUState
358	%endif ; VBOX_WITH_64_BITS_GUESTS
359	%endif ; ARCH_BITS == 32
360

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source: vbox/trunk/src/VBox/VMM/VMMR0/CPUMR0A.asm@ 87361

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