CPUMAllA.asm@ 13085

Last change on this file since 13085 was 12657, checked in by vboxsync, 16 years ago
#1865: CPUM. Also added missing aliasing for DR4&5 to the guest DRx setter and getter.
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1	; $Id: CPUMAllA.asm 12657 2008-09-22 18:29:06Z 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	; Enables write protection of Hypervisor memory pages.
39	; !note! Must be commented out for Trap8 debug handler.
40	;
41	%define ENABLE_WRITE_PROTECTION 1
42
43	;; @def CPUM_REG
44	; The register which we load the CPUM pointer into.
45	%ifdef RT_ARCH_AMD64
46	%define CPUM_REG rdx
47	%else
48	%define CPUM_REG edx
49	%endif
50
51	BEGINCODE
52
53
54	;;
55	; Handles lazy FPU saving and restoring.
56	;
57	; This handler will implement lazy fpu (sse/mmx/stuff) saving.
58	; Two actions may be taken in this handler since the Guest OS may
59	; be doing lazy fpu switching. So, we'll have to generate those
60	; traps which the Guest CPU CTX shall have according to the
61	; its CR0 flags. If no traps for the Guest OS, we'll save the host
62	; context and restore the guest context.
63	;
64	; @returns 0 if caller should continue execution.
65	; @returns VINF_EM_RAW_GUEST_TRAP if a guest trap should be generated.
66	; @param pCPUM x86:[esp+4] GCC:rdi MSC:rcx CPUM pointer
67	;
68	align 16
69	BEGINPROC CPUMHandleLazyFPUAsm
70	;
71	; Figure out what to do.
72	;
73	; There are two basic actions:
74	; 1. Save host fpu and restore guest fpu.
75	; 2. Generate guest trap.
76	;
77	; When entering the hypervisor we'll always enable MP (for proper wait
78	; trapping) and TS (for intercepting all fpu/mmx/sse stuff). The EM flag
79	; is taken from the guest OS in order to get proper SSE handling.
80	;
81	;
82	; Actions taken depending on the guest CR0 flags:
83	;
84	; 3 2 1
85	; TS \| EM \| MP \| FPUInstr \| WAIT :: VMM Action
86	; ------------------------------------------------------------------------
87	; 0 \| 0 \| 0 \| Exec \| Exec :: Clear TS & MP, Save HC, Load GC.
88	; 0 \| 0 \| 1 \| Exec \| Exec :: Clear TS, Save HC, Load GC.
89	; 0 \| 1 \| 0 \| #NM \| Exec :: Clear TS & MP, Save HC, Load GC;
90	; 0 \| 1 \| 1 \| #NM \| Exec :: Clear TS, Save HC, Load GC.
91	; 1 \| 0 \| 0 \| #NM \| Exec :: Clear MP, Save HC, Load GC. (EM is already cleared.)
92	; 1 \| 0 \| 1 \| #NM \| #NM :: Go to host taking trap there.
93	; 1 \| 1 \| 0 \| #NM \| Exec :: Clear MP, Save HC, Load GC. (EM is already set.)
94	; 1 \| 1 \| 1 \| #NM \| #NM :: Go to host taking trap there.
95
96	;
97	; Before taking any of these actions we're checking if we have already
98	; loaded the GC FPU. Because if we have, this is an trap for the guest - raw ring-3.
99	;
100	%ifdef RT_ARCH_AMD64
101	%ifdef RT_OS_WINDOWS
102	mov xDX, rcx
103	%else
104	mov xDX, rdi
105	%endif
106	%else
107	mov xDX, dword [esp + 4]
108	%endif
109	test dword [xDX + CPUM.fUseFlags], CPUM_USED_FPU
110	jz hlfpua_not_loaded
111	jmp hlfpua_to_host
112
113	;
114	; Take action.
115	;
116	align 16
117	hlfpua_not_loaded:
118	mov eax, [xDX + CPUM.Guest.cr0]
119	and eax, X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS
120	%ifdef RT_ARCH_AMD64
121	lea r8, [hlfpuajmp1 wrt rip]
122	jmp qword [rax*4 + r8]
123	%else
124	jmp dword [eax*2 + hlfpuajmp1]
125	%endif
126	align 16
127	;; jump table using fpu related cr0 flags as index.
128	hlfpuajmp1:
129	RTCCPTR_DEF hlfpua_switch_fpu_ctx
130	RTCCPTR_DEF hlfpua_switch_fpu_ctx
131	RTCCPTR_DEF hlfpua_switch_fpu_ctx
132	RTCCPTR_DEF hlfpua_switch_fpu_ctx
133	RTCCPTR_DEF hlfpua_switch_fpu_ctx
134	RTCCPTR_DEF hlfpua_to_host
135	RTCCPTR_DEF hlfpua_switch_fpu_ctx
136	RTCCPTR_DEF hlfpua_to_host
137	;; and mask for cr0.
138	hlfpu_afFlags:
139	RTCCPTR_DEF ~(X86_CR0_TS \| X86_CR0_MP)
140	RTCCPTR_DEF ~(X86_CR0_TS)
141	RTCCPTR_DEF ~(X86_CR0_TS \| X86_CR0_MP)
142	RTCCPTR_DEF ~(X86_CR0_TS)
143	RTCCPTR_DEF ~(X86_CR0_MP)
144	RTCCPTR_DEF 0
145	RTCCPTR_DEF ~(X86_CR0_MP)
146	RTCCPTR_DEF 0
147
148	;
149	; Action - switch FPU context and change cr0 flags.
150	;
151	align 16
152	hlfpua_switch_fpu_ctx:
153	%ifndef IN_RING3 ; IN_GC or IN_RING0
154	mov xCX, cr0
155	%ifdef RT_ARCH_AMD64
156	lea r8, [hlfpu_afFlags wrt rip]
157	and rcx, [rax*4 + r8] ; calc the new cr0 flags.
158	%else
159	and ecx, [eax*2 + hlfpu_afFlags] ; calc the new cr0 flags.
160	%endif
161	mov xAX, cr0
162	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
163	mov cr0, xAX ; clear flags so we don't trap here.
164	%endif
165	%ifndef RT_ARCH_AMD64
166	test dword [xDX + CPUM.CPUFeatures.edx], X86_CPUID_FEATURE_EDX_FXSR
167	jz short hlfpua_no_fxsave
168	%endif
169
170	fxsave [xDX + CPUM.Host.fpu]
171	or dword [xDX + CPUM.fUseFlags], (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)
172	fxrstor [xDX + CPUM.Guest.fpu]
173	hlfpua_finished_switch:
174	%ifdef IN_GC
175	mov cr0, xCX ; load the new cr0 flags.
176	%endif
177	; return continue execution.
178	xor eax, eax
179	ret
180
181	%ifndef RT_ARCH_AMD64
182	; legacy support.
183	hlfpua_no_fxsave:
184	fnsave [xDX + CPUM.Host.fpu]
185	or dword [xDX + CPUM.fUseFlags], dword (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM) ; yasm / nasm
186	mov eax, [xDX + CPUM.Guest.fpu] ; control word
187	not eax ; 1 means exception ignored (6 LS bits)
188	and eax, byte 03Fh ; 6 LS bits only
189	test eax, [xDX + CPUM.Guest.fpu + 4]; status word
190	jz short hlfpua_no_exceptions_pending
191	; technically incorrect, but we certainly don't want any exceptions now!!
192	and dword [xDX + CPUM.Guest.fpu + 4], ~03Fh
193	hlfpua_no_exceptions_pending:
194	frstor [xDX + CPUM.Guest.fpu]
195	jmp near hlfpua_finished_switch
196	%endif ; !RT_ARCH_AMD64
197
198
199	;
200	; Action - Generate Guest trap.
201	;
202	hlfpua_action_4:
203	hlfpua_to_host:
204	mov eax, VINF_EM_RAW_GUEST_TRAP
205	ret
206	ENDPROC CPUMHandleLazyFPUAsm
207
208
209	;;
210	; Restores the host's FPU/XMM state
211	;
212	; @returns 0
213	; @param pCPUM x86:[esp+4] GCC:rdi MSC:rcx CPUM pointer
214	;
215	align 16
216	BEGINPROC CPUMRestoreHostFPUStateAsm
217	%ifdef RT_ARCH_AMD64
218	%ifdef RT_OS_WINDOWS
219	mov xDX, rcx
220	%else
221	mov xDX, rdi
222	%endif
223	%else
224	mov xDX, dword [esp + 4]
225	%endif
226
227	; Restore FPU if guest has used it.
228	; Using fxrstor should ensure that we're not causing unwanted exception on the host.
229	test dword [xDX + CPUM.fUseFlags], CPUM_USED_FPU
230	jz short gth_fpu_no
231
232	mov xAX, cr0
233	mov xCX, xAX ; save old CR0
234	and xAX, ~(X86_CR0_TS \| X86_CR0_EM)
235	mov cr0, xAX
236
237	fxsave [xDX + CPUM.Guest.fpu]
238	fxrstor [xDX + CPUM.Host.fpu]
239
240	mov cr0, xCX ; and restore old CR0 again
241	and dword [xDX + CPUM.fUseFlags], ~CPUM_USED_FPU
242	gth_fpu_no:
243	xor eax, eax
244	ret
245	ENDPROC CPUMRestoreHostFPUStateAsm
246
247
248	;;
249	; Restores the guest's FPU/XMM state
250	;
251	; @param pCtx x86:[esp+4] GCC:rdi MSC:rcx CPUMCTX pointer
252	;
253	align 16
254	BEGINPROC CPUMLoadFPUAsm
255	%ifdef RT_ARCH_AMD64
256	%ifdef RT_OS_WINDOWS
257	mov xDX, rcx
258	%else
259	mov xDX, rdi
260	%endif
261	%else
262	mov xDX, dword [esp + 4]
263	%endif
264	fxrstor [xDX + CPUMCTX.fpu]
265	ret
266	ENDPROC CPUMLoadFPUAsm
267
268
269	;;
270	; Restores the guest's FPU/XMM state
271	;
272	; @param pCtx x86:[esp+4] GCC:rdi MSC:rcx CPUMCTX pointer
273	;
274	align 16
275	BEGINPROC CPUMSaveFPUAsm
276	%ifdef RT_ARCH_AMD64
277	%ifdef RT_OS_WINDOWS
278	mov xDX, rcx
279	%else
280	mov xDX, rdi
281	%endif
282	%else
283	mov xDX, dword [esp + 4]
284	%endif
285	fxsave [xDX + CPUMCTX.fpu]
286	ret
287	ENDPROC CPUMSaveFPUAsm
288
289
290	;;
291	; Restores the guest's XMM state
292	;
293	; @param pCtx x86:[esp+4] GCC:rdi MSC:rcx CPUMCTX pointer
294	;
295	align 16
296	BEGINPROC CPUMLoadXMMAsm
297	%ifdef RT_ARCH_AMD64
298	%ifdef RT_OS_WINDOWS
299	mov xDX, rcx
300	%else
301	mov xDX, rdi
302	%endif
303	%else
304	mov xDX, dword [esp + 4]
305	%endif
306	movdqa xmm0, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*0]
307	movdqa xmm1, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*1]
308	movdqa xmm2, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*2]
309	movdqa xmm3, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*3]
310	movdqa xmm4, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*4]
311	movdqa xmm5, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*5]
312	movdqa xmm6, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*6]
313	movdqa xmm7, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*7]
314
315	%ifdef RT_ARCH_AMD64
316	test qword [xDX + CPUMCTX.msrEFER], MSR_K6_EFER_LMA
317	jz CPUMLoadXMMAsm_done
318
319	movdqa xmm8, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*8]
320	movdqa xmm9, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*9]
321	movdqa xmm10, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*10]
322	movdqa xmm11, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*11]
323	movdqa xmm12, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*12]
324	movdqa xmm13, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*13]
325	movdqa xmm14, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*14]
326	movdqa xmm15, [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*15]
327	CPUMLoadXMMAsm_done:
328	%endif
329
330	ret
331	ENDPROC CPUMLoadXMMAsm
332
333
334	;;
335	; Restores the guest's XMM state
336	;
337	; @param pCtx x86:[esp+4] GCC:rdi MSC:rcx CPUMCTX pointer
338	;
339	align 16
340	BEGINPROC CPUMSaveXMMAsm
341	%ifdef RT_ARCH_AMD64
342	%ifdef RT_OS_WINDOWS
343	mov xDX, rcx
344	%else
345	mov xDX, rdi
346	%endif
347	%else
348	mov xDX, dword [esp + 4]
349	%endif
350	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*0], xmm0
351	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*1], xmm1
352	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*2], xmm2
353	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*3], xmm3
354	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*4], xmm4
355	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*5], xmm5
356	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*6], xmm6
357	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*7], xmm7
358
359	%ifdef RT_ARCH_AMD64
360	test qword [xDX + CPUMCTX.msrEFER], MSR_K6_EFER_LMA
361	jz CPUMSaveXMMAsm_done
362
363	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*8], xmm8
364	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*9], xmm9
365	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*10], xmm10
366	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*11], xmm11
367	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*12], xmm12
368	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*13], xmm13
369	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*14], xmm14
370	movdqa [xDX + CPUMCTX.fpu + X86FXSTATE.aXMM + 16*15], xmm15
371
372	CPUMSaveXMMAsm_done:
373	%endif
374	ret
375	ENDPROC CPUMSaveXMMAsm
376
377
378	;;
379	; Set the FPU control word; clearing exceptions first
380	;
381	; @param u16FCW x86:[esp+4] GCC:rdi MSC:rcx New FPU control word
382	align 16
383	BEGINPROC CPUMSetFCW
384	%ifdef RT_ARCH_AMD64
385	%ifdef RT_OS_WINDOWS
386	mov xAX, rcx
387	%else
388	mov xAX, rdi
389	%endif
390	%else
391	mov xAX, dword [esp + 4]
392	%endif
393	fnclex
394	push xAX
395	fldcw [xSP]
396	pop xAX
397	ret
398	ENDPROC CPUMSetFCW
399
400
401	;;
402	; Get the FPU control word
403	;
404	align 16
405	BEGINPROC CPUMGetFCW
406	fnstcw [xSP - 8]
407	mov ax, word [xSP - 8]
408	ret
409	ENDPROC CPUMGetFCW
410
411
412	;;
413	; Set the MXCSR;
414	;
415	; @param u32MXCSR x86:[esp+4] GCC:rdi MSC:rcx New MXCSR
416	align 16
417	BEGINPROC CPUMSetMXCSR
418	%ifdef RT_ARCH_AMD64
419	%ifdef RT_OS_WINDOWS
420	mov xAX, rcx
421	%else
422	mov xAX, rdi
423	%endif
424	%else
425	mov xAX, dword [esp + 4]
426	%endif
427	push xAX
428	ldmxcsr [xSP]
429	pop xAX
430	ret
431	ENDPROC CPUMSetMXCSR
432
433
434	;;
435	; Get the MXCSR
436	;
437	align 16
438	BEGINPROC CPUMGetMXCSR
439	stmxcsr [xSP - 8]
440	mov eax, dword [xSP - 8]
441	ret
442	ENDPROC CPUMGetMXCSR

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source: vbox/trunk/src/VBox/VMM/VMMAll/CPUMAllA.asm@ 13085

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