CPUMR0A.asm

Last change on this file was 106061, checked in by vboxsync, 7 weeks ago
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1	; $Id: CPUMR0A.asm 106061 2024-09-16 14:03:52Z vboxsync $
2	;; @file
3	; CPUM - Ring-0 Assembly Routines (supporting HM and IEM).
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 RT_ASM_WITH_SEH64
33	%include "iprt/asmdefs.mac"
34	%include "VBox/asmdefs.mac"
35	%include "VBox/vmm/vm.mac"
36	%include "VBox/err.mac"
37	%include "VBox/vmm/stam.mac"
38	%include "CPUMInternal.mac"
39	%include "iprt/x86.mac"
40	%include "VBox/vmm/cpum.mac"
41
42
43	BEGINCODE
44
45	;;
46	; Makes sure the EMTs have a FPU state associated with them on hosts where we're
47	; allowed to use it in ring-0 too.
48	;
49	; This ensure that we don't have to allocate the state lazily while trying to execute
50	; guest code with preemption disabled or worse.
51	;
52	; @cproto VMMR0_INT_DECL(void) CPUMR0RegisterVCpuThread(PVMCPU pVCpu);
53	;
54	BEGINPROC CPUMR0RegisterVCpuThread
55	push xBP
56	SEH64_PUSH_xBP
57	mov xBP, xSP
58	SEH64_SET_FRAME_xBP 0
59	SEH64_END_PROLOGUE
60
61	%ifdef VMM_R0_TOUCH_FPU
62	movdqa xmm0, xmm0 ; hope this is harmless.
63	%endif
64
65	.return:
66	xor eax, eax ; paranoia
67	leave
68	ret
69	ENDPROC CPUMR0RegisterVCpuThread
70
71
72	%ifdef VMM_R0_TOUCH_FPU
73	;;
74	; Touches the host FPU state.
75	;
76	; @uses nothing (well, maybe cr0)
77	;
78	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
79	ALIGNCODE(16)
80	%endif
81	BEGINPROC CPUMR0TouchHostFpu
82	push xBP
83	SEH64_PUSH_xBP
84	mov xBP, xSP
85	SEH64_SET_FRAME_xBP 0
86	SEH64_END_PROLOGUE
87
88	movdqa xmm0, xmm0 ; Hope this is harmless.
89
90	leave
91	ret
92	ENDPROC CPUMR0TouchHostFpu
93	%endif ; VMM_R0_TOUCH_FPU
94
95
96	;;
97	; Saves the host FPU/SSE/AVX state and restores the guest FPU/SSE/AVX state.
98	;
99	; @returns VINF_SUCCESS (0) or VINF_CPUM_HOST_CR0_MODIFIED. (EAX)
100	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
101	;
102	; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
103	; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
104	; However the compiler docs have different idea:
105	; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
106	; We'll go with the former for now.
107	;
108	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
109	ALIGNCODE(16)
110	%endif
111	BEGINPROC cpumR0SaveHostRestoreGuestFPUState
112	push xBP
113	SEH64_PUSH_xBP
114	mov xBP, xSP
115	SEH64_SET_FRAME_xBP 0
116	SEH64_END_PROLOGUE
117
118	;
119	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
120	;
121	%ifdef RT_ARCH_AMD64
122	%ifdef RT_OS_WINDOWS
123	mov r11, rcx
124	%else
125	mov r11, rdi
126	%endif
127	%define pCpumCpu r11
128	%define pXState r10
129	%else
130	push ebx
131	push esi
132	mov ebx, dword [ebp + 8]
133	%define pCpumCpu ebx
134	%define pXState esi
135	%endif
136
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	;
141	; Save the host state.
142	;
143	test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_HOST
144	jnz .already_saved_host
145
146	CPUMRZ_TOUCH_FPU_CLEAR_CR0_FPU_TRAPS_SET_RC xCX, xAX, pCpumCpu ; xCX is the return value for VT-x; xAX is scratch.
147
148	CPUMR0_SAVE_HOST
149
150	%ifdef VBOX_WITH_KERNEL_USING_XMM
151	jmp .load_guest
152	%endif
153	.already_saved_host:
154	%ifdef VBOX_WITH_KERNEL_USING_XMM
155	; If we didn't save the host state, we must save the non-volatile XMM registers.
156	lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
157	stmxcsr [pXState + X86FXSTATE.MXCSR]
158	movdqa [pXState + X86FXSTATE.xmm6 ], xmm6
159	movdqa [pXState + X86FXSTATE.xmm7 ], xmm7
160	movdqa [pXState + X86FXSTATE.xmm8 ], xmm8
161	movdqa [pXState + X86FXSTATE.xmm9 ], xmm9
162	movdqa [pXState + X86FXSTATE.xmm10], xmm10
163	movdqa [pXState + X86FXSTATE.xmm11], xmm11
164	movdqa [pXState + X86FXSTATE.xmm12], xmm12
165	movdqa [pXState + X86FXSTATE.xmm13], xmm13
166	movdqa [pXState + X86FXSTATE.xmm14], xmm14
167	movdqa [pXState + X86FXSTATE.xmm15], xmm15
168
169	;
170	; Load the guest state.
171	;
172	.load_guest:
173	%endif
174	CPUMR0_LOAD_GUEST
175
176	%ifdef VBOX_WITH_KERNEL_USING_XMM
177	; Restore the non-volatile xmm registers. ASSUMING 64-bit host.
178	lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
179	movdqa xmm6, [pXState + X86FXSTATE.xmm6]
180	movdqa xmm7, [pXState + X86FXSTATE.xmm7]
181	movdqa xmm8, [pXState + X86FXSTATE.xmm8]
182	movdqa xmm9, [pXState + X86FXSTATE.xmm9]
183	movdqa xmm10, [pXState + X86FXSTATE.xmm10]
184	movdqa xmm11, [pXState + X86FXSTATE.xmm11]
185	movdqa xmm12, [pXState + X86FXSTATE.xmm12]
186	movdqa xmm13, [pXState + X86FXSTATE.xmm13]
187	movdqa xmm14, [pXState + X86FXSTATE.xmm14]
188	movdqa xmm15, [pXState + X86FXSTATE.xmm15]
189	ldmxcsr [pXState + X86FXSTATE.MXCSR]
190	%endif
191
192	or dword [pCpumCpu + CPUMCPU.fUseFlags], (CPUM_USED_FPU_GUEST \| CPUM_USED_FPU_SINCE_REM \| CPUM_USED_FPU_HOST)
193	mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 1
194	popf
195
196	mov eax, ecx
197	.return:
198	%ifdef RT_ARCH_X86
199	pop esi
200	pop ebx
201	%endif
202	leave
203	ret
204	ENDPROC cpumR0SaveHostRestoreGuestFPUState
205
206
207	;;
208	; Saves the guest FPU/SSE/AVX state and restores the host FPU/SSE/AVX state.
209	;
210	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
211	;
212	; @remarks 64-bit Windows drivers shouldn't use AVX registers without saving+loading:
213	; https://msdn.microsoft.com/en-us/library/windows/hardware/ff545910%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
214	; However the compiler docs have different idea:
215	; https://msdn.microsoft.com/en-us/library/9z1stfyw.aspx
216	; We'll go with the former for now.
217	;
218	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
219	ALIGNCODE(16)
220	%endif
221	BEGINPROC cpumR0SaveGuestRestoreHostFPUState
222	push xBP
223	SEH64_PUSH_xBP
224	mov xBP, xSP
225	SEH64_SET_FRAME_xBP 0
226	SEH64_END_PROLOGUE
227
228	;
229	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
230	;
231	%ifdef RT_ARCH_AMD64
232	%ifdef RT_OS_WINDOWS
233	mov r11, rcx
234	%else
235	mov r11, rdi
236	%endif
237	%define pCpumCpu r11
238	%define pXState r10
239	%else
240	push ebx
241	push esi
242	mov ebx, dword [ebp + 8]
243	%define pCpumCpu ebx
244	%define pXState esi
245	%endif
246	pushf ; The darwin kernel can get upset or upset things if an
247	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
248
249	%ifdef VBOX_WITH_KERNEL_USING_XMM
250	;
251	; Copy non-volatile XMM registers to the host state so we can use
252	; them while saving the guest state (we've gotta do this anyway).
253	;
254	lea pXState, [pCpumCpu + CPUMCPU.Host.XState]
255	stmxcsr [pXState + X86FXSTATE.MXCSR]
256	movdqa [pXState + X86FXSTATE.xmm6], xmm6
257	movdqa [pXState + X86FXSTATE.xmm7], xmm7
258	movdqa [pXState + X86FXSTATE.xmm8], xmm8
259	movdqa [pXState + X86FXSTATE.xmm9], xmm9
260	movdqa [pXState + X86FXSTATE.xmm10], xmm10
261	movdqa [pXState + X86FXSTATE.xmm11], xmm11
262	movdqa [pXState + X86FXSTATE.xmm12], xmm12
263	movdqa [pXState + X86FXSTATE.xmm13], xmm13
264	movdqa [pXState + X86FXSTATE.xmm14], xmm14
265	movdqa [pXState + X86FXSTATE.xmm15], xmm15
266	%endif
267
268	;
269	; Save the guest state if necessary.
270	;
271	test dword [pCpumCpu + CPUMCPU.fUseFlags], CPUM_USED_FPU_GUEST
272	jz .load_only_host
273
274	%ifdef VBOX_WITH_KERNEL_USING_XMM
275	; Load the guest XMM register values we already saved in HMR0VMXStartVMWrapXMM.
276	lea pXState, [pCpumCpu + CPUMCPU.Guest.XState]
277	movdqa xmm0, [pXState + X86FXSTATE.xmm0]
278	movdqa xmm1, [pXState + X86FXSTATE.xmm1]
279	movdqa xmm2, [pXState + X86FXSTATE.xmm2]
280	movdqa xmm3, [pXState + X86FXSTATE.xmm3]
281	movdqa xmm4, [pXState + X86FXSTATE.xmm4]
282	movdqa xmm5, [pXState + X86FXSTATE.xmm5]
283	movdqa xmm6, [pXState + X86FXSTATE.xmm6]
284	movdqa xmm7, [pXState + X86FXSTATE.xmm7]
285	movdqa xmm8, [pXState + X86FXSTATE.xmm8]
286	movdqa xmm9, [pXState + X86FXSTATE.xmm9]
287	movdqa xmm10, [pXState + X86FXSTATE.xmm10]
288	movdqa xmm11, [pXState + X86FXSTATE.xmm11]
289	movdqa xmm12, [pXState + X86FXSTATE.xmm12]
290	movdqa xmm13, [pXState + X86FXSTATE.xmm13]
291	movdqa xmm14, [pXState + X86FXSTATE.xmm14]
292	movdqa xmm15, [pXState + X86FXSTATE.xmm15]
293	ldmxcsr [pXState + X86FXSTATE.MXCSR]
294	%endif
295	CPUMR0_SAVE_GUEST
296
297	;
298	; Load the host state.
299	;
300	.load_only_host:
301	CPUMR0_LOAD_HOST
302
303	; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
304	; in cpumRZSaveHostFPUState.
305	mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
306	CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
307	and dword [pCpumCpu + CPUMCPU.fUseFlags], ~(CPUM_USED_FPU_GUEST \| CPUM_USED_FPU_HOST)
308	mov byte [pCpumCpu + CPUMCPU.Guest.fUsedFpuGuest], 0
309
310	popf
311	%ifdef RT_ARCH_X86
312	pop esi
313	pop ebx
314	%endif
315	leave
316	ret
317	%undef pCpumCpu
318	%undef pXState
319	ENDPROC cpumR0SaveGuestRestoreHostFPUState
320
321
322	%if ARCH_BITS == 32
323	%ifdef VBOX_WITH_64_BITS_GUESTS
324	;;
325	; Restores the host's FPU/SSE/AVX state from pCpumCpu->Host.
326	;
327	; @param pCpumCpu x86:[ebp+8] gcc:rdi msc:rcx CPUMCPU pointer
328	;
329	%ifndef RT_ASM_WITH_SEH64 ; workaround for yasm 1.3.0 bug (error: prologue -1 bytes, must be <256)
330	ALIGNCODE(16)
331	%endif
332	BEGINPROC cpumR0RestoreHostFPUState
333	;
334	; Prologue - xAX+xDX must be free for XSAVE/XRSTOR input.
335	;
336	push ebp
337	mov ebp, esp
338	push ebx
339	push esi
340	mov ebx, dword [ebp + 8]
341	%define pCpumCpu ebx
342	%define pXState esi
343
344	;
345	; Restore host CPU state.
346	;
347	pushf ; The darwin kernel can get upset or upset things if an
348	cli ; interrupt occurs while we're doing fxsave/fxrstor/cr0.
349
350	CPUMR0_LOAD_HOST
351
352	; Restore the CR0 value we saved in cpumR0SaveHostRestoreGuestFPUState or
353	; in cpumRZSaveHostFPUState.
354	;; @todo What about XCR0?
355	mov xCX, [pCpumCpu + CPUMCPU.Host.cr0Fpu]
356	CPUMRZ_RESTORE_CR0_IF_TS_OR_EM_SET xCX
357
358	and dword [pCpumCpu + CPUMCPU.fUseFlags], ~CPUM_USED_FPU_HOST
359	popf
360
361	pop esi
362	pop ebx
363	leave
364	ret
365	%undef pCpumCPu
366	%undef pXState
367	ENDPROC cpumR0RestoreHostFPUState
368	%endif ; VBOX_WITH_64_BITS_GUESTS
369	%endif ; ARCH_BITS == 32
370

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

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