EMGCA.asm@ 29287

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1	; $Id: EMAllA.asm 20278 2007-04-09 11:56:29Z sandervl $
2	;; @file
3	; EM Assembly Routines.
4	;
5
6	;
7	; Copyright (C) 2006-2007 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/err.mac"
23	%include "VBox/x86.mac"
24
25	BEGINCODE
26
27	;;
28	; Emulate LOCK CMPXCHG instruction, CDECL calling conv.
29	; VMMRCDECL(uint32_t) EMGCEmulateLockCmpXchg(RTGCPTR pu32Param1, uint32_t pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t pEflags);
30	;
31	; @returns eax=0 if data written, other code - invalid access, #PF was generated.
32	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
33	; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (eax)
34	; @param [esp + 0ch] Param 3 - Third parameter - third parameter
35	; @param [esp + 10h] Param 4 - Size of parameters, only 1/2/4 is valid.
36	; @param [esp + 14h] Param 4 - Pointer to eflags (out)
37	; @uses eax, ecx, edx
38	;
39	align 16
40	BEGINPROC EMGCEmulateLockCmpXchg
41	push ebx
42	mov ecx, [esp + 04h + 4] ; ecx = first parameter
43	mov ebx, [esp + 08h + 4] ; ebx = 2nd parameter (eax)
44	mov edx, [esp + 0ch + 4] ; edx = third parameter
45	mov eax, [esp + 10h + 4] ; eax = size of parameters
46
47	cmp al, 4
48	je short .do_dword ; 4 bytes variant
49	cmp al, 2
50	je short .do_word ; 2 byte variant
51	cmp al, 1
52	je short .do_byte ; 1 bytes variant
53	int3
54
55	.do_dword:
56	; load 2nd parameter's value
57	mov eax, dword [ebx]
58
59	lock cmpxchg dword [ecx], edx ; do 4 bytes CMPXCHG
60	mov dword [ebx], eax
61	jmp short .done
62
63	.do_word:
64	; load 2nd parameter's value
65	mov eax, dword [ebx]
66
67	lock cmpxchg word [ecx], dx ; do 2 bytes CMPXCHG
68	mov word [ebx], ax
69	jmp short .done
70
71	.do_byte:
72	; load 2nd parameter's value
73	mov eax, dword [ebx]
74
75	lock cmpxchg byte [ecx], dl ; do 1 bytes CMPXCHG
76	mov byte [ebx], al
77
78	.done:
79	; collect flags and return.
80	pushf
81	pop eax
82
83	mov edx, [esp + 14h + 4] ; eflags pointer
84	mov dword [edx], eax
85
86	pop ebx
87	mov eax, VINF_SUCCESS
88	retn
89
90	; Read error - we will be here after our page fault handler.
91	GLOBALNAME EMGCEmulateLockCmpXchg_Error
92	pop ebx
93	mov eax, VERR_ACCESS_DENIED
94	ret
95
96	ENDPROC EMGCEmulateLockCmpXchg
97
98	;;
99	; Emulate CMPXCHG instruction, CDECL calling conv.
100	; VMMRCDECL(uint32_t) EMGCEmulateCmpXchg(RTGCPTR pu32Param1, uint32_t pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t pEflags);
101	;
102	; @returns eax=0 if data written, other code - invalid access, #PF was generated.
103	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
104	; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (eax)
105	; @param [esp + 0ch] Param 3 - Third parameter - third parameter
106	; @param [esp + 10h] Param 4 - Size of parameters, only 1/2/4 is valid.
107	; @param [esp + 14h] Param 4 - Pointer to eflags (out)
108	; @uses eax, ecx, edx
109	;
110	align 16
111	BEGINPROC EMGCEmulateCmpXchg
112	push ebx
113	mov ecx, [esp + 04h + 4] ; ecx = first parameter
114	mov ebx, [esp + 08h + 4] ; ebx = 2nd parameter (eax)
115	mov edx, [esp + 0ch + 4] ; edx = third parameter
116	mov eax, [esp + 10h + 4] ; eax = size of parameters
117
118	cmp al, 4
119	je short .do_dword ; 4 bytes variant
120	cmp al, 2
121	je short .do_word ; 2 byte variant
122	cmp al, 1
123	je short .do_byte ; 1 bytes variant
124	int3
125
126	.do_dword:
127	; load 2nd parameter's value
128	mov eax, dword [ebx]
129
130	cmpxchg dword [ecx], edx ; do 4 bytes CMPXCHG
131	mov dword [ebx], eax
132	jmp short .done
133
134	.do_word:
135	; load 2nd parameter's value
136	mov eax, dword [ebx]
137
138	cmpxchg word [ecx], dx ; do 2 bytes CMPXCHG
139	mov word [ebx], ax
140	jmp short .done
141
142	.do_byte:
143	; load 2nd parameter's value
144	mov eax, dword [ebx]
145
146	cmpxchg byte [ecx], dl ; do 1 bytes CMPXCHG
147	mov byte [ebx], al
148
149	.done:
150	; collect flags and return.
151	pushf
152	pop eax
153
154	mov edx, [esp + 14h + 4] ; eflags pointer
155	mov dword [edx], eax
156
157	pop ebx
158	mov eax, VINF_SUCCESS
159	retn
160
161	; Read error - we will be here after our page fault handler.
162	GLOBALNAME EMGCEmulateCmpXchg_Error
163	pop ebx
164	mov eax, VERR_ACCESS_DENIED
165	ret
166	ENDPROC EMGCEmulateCmpXchg
167
168	;;
169	; Emulate LOCK CMPXCHG8B instruction, CDECL calling conv.
170	; VMMRCDECL(uint32_t) EMGCEmulateLockCmpXchg8b(RTGCPTR pu32Param1, uint32_t pEAX, uint32_t pEDX, uint32_t uEBX, uint32_t uECX, uint32_t *pEflags);
171	;
172	; @returns eax=0 if data written, other code - invalid access, #PF was generated.
173	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
174	; @param [esp + 08h] Param 2 - Address of the eax register
175	; @param [esp + 0ch] Param 3 - Address of the edx register
176	; @param [esp + 10h] Param 4 - EBX
177	; @param [esp + 14h] Param 5 - ECX
178	; @param [esp + 18h] Param 6 - Pointer to eflags (out)
179	; @uses eax, ecx, edx
180	;
181	align 16
182	BEGINPROC EMGCEmulateLockCmpXchg8b
183	push ebp
184	push ebx
185	mov ebp, [esp + 04h + 8] ; ebp = first parameter
186	mov eax, [esp + 08h + 8] ; &EAX
187	mov eax, dword [eax]
188	mov edx, [esp + 0ch + 8] ; &EDX
189	mov edx, dword [edx]
190	mov ebx, [esp + 10h + 8] ; EBX
191	mov ecx, [esp + 14h + 8] ; ECX
192
193	%ifdef RT_OS_OS2
194	lock cmpxchg8b [ebp] ; do CMPXCHG8B
195	%else
196	lock cmpxchg8b qword [ebp] ; do CMPXCHG8B
197	%endif
198	mov ebx, dword [esp + 08h + 8]
199	mov dword [ebx], eax
200	mov ebx, dword [esp + 0ch + 8]
201	mov dword [ebx], edx
202
203	; collect flags and return.
204	pushf
205	pop eax
206
207	mov edx, [esp + 18h + 8] ; eflags pointer
208	mov dword [edx], eax
209
210	pop ebx
211	pop ebp
212	mov eax, VINF_SUCCESS
213	retn
214
215	; Read error - we will be here after our page fault handler.
216	GLOBALNAME EMGCEmulateLockCmpXchg8b_Error
217	pop ebx
218	pop ebp
219	mov eax, VERR_ACCESS_DENIED
220	ret
221
222	ENDPROC EMGCEmulateLockCmpXchg8b
223
224	;;
225	; Emulate CMPXCHG8B instruction, CDECL calling conv.
226	; VMMRCDECL(uint32_t) EMGCEmulateCmpXchg8b(RTGCPTR pu32Param1, uint32_t pEAX, uint32_t pEDX, uint32_t uEBX, uint32_t uECX, uint32_t *pEflags);
227	;
228	; @returns eax=0 if data written, other code - invalid access, #PF was generated.
229	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
230	; @param [esp + 08h] Param 2 - Address of the eax register
231	; @param [esp + 0ch] Param 3 - Address of the edx register
232	; @param [esp + 10h] Param 4 - EBX
233	; @param [esp + 14h] Param 5 - ECX
234	; @param [esp + 18h] Param 6 - Pointer to eflags (out)
235	; @uses eax, ecx, edx
236	;
237	align 16
238	BEGINPROC EMGCEmulateCmpXchg8b
239	push ebp
240	push ebx
241	mov ebp, [esp + 04h + 8] ; ebp = first parameter
242	mov eax, [esp + 08h + 8] ; &EAX
243	mov eax, dword [eax]
244	mov edx, [esp + 0ch + 8] ; &EDX
245	mov edx, dword [edx]
246	mov ebx, [esp + 10h + 8] ; EBX
247	mov ecx, [esp + 14h + 8] ; ECX
248
249	%ifdef RT_OS_OS2
250	cmpxchg8b [ebp] ; do CMPXCHG8B
251	%else
252	cmpxchg8b qword [ebp] ; do CMPXCHG8B
253	%endif
254	mov ebx, dword [esp + 08h + 8]
255	mov dword [ebx], eax
256	mov ebx, dword [esp + 0ch + 8]
257	mov dword [ebx], edx
258
259	; collect flags and return.
260	pushf
261	pop eax
262
263	mov edx, [esp + 18h + 8] ; eflags pointer
264	mov dword [edx], eax
265
266	pop ebx
267	pop ebp
268	mov eax, VINF_SUCCESS
269	retn
270
271	; Read error - we will be here after our page fault handler.
272	GLOBALNAME EMGCEmulateCmpXchg8b_Error
273	pop ebx
274	pop ebp
275	mov eax, VERR_ACCESS_DENIED
276	ret
277	ENDPROC EMGCEmulateCmpXchg8b
278
279	;;
280	; Emulate LOCK XADD instruction, CDECL calling conv.
281	; VMMRCDECL(uint32_t) EMGCEmulateLockXAdd(RTGCPTR pu32Param1, uint32_t pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t pEflags);
282	;
283	; @returns eax=0 if data exchanged, other code - invalid access, #PF was generated.
284	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
285	; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (general register)
286	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
287	; @param [esp + 10h] Param 4 - Pointer to eflags (out)
288	; @uses eax, ecx, edx
289	;
290	align 16
291	BEGINPROC EMGCEmulateLockXAdd
292	mov ecx, [esp + 04h + 0] ; ecx = first parameter
293	mov edx, [esp + 08h + 0] ; edx = 2nd parameter
294	mov eax, [esp + 0ch + 0] ; eax = size of parameters
295
296	cmp al, 4
297	je short .do_dword ; 4 bytes variant
298	cmp al, 2
299	je short .do_word ; 2 byte variant
300	cmp al, 1
301	je short .do_byte ; 1 bytes variant
302	int3
303
304	.do_dword:
305	; load 2nd parameter's value
306	mov eax, dword [edx]
307	lock xadd dword [ecx], eax ; do 4 bytes XADD
308	mov dword [edx], eax
309	jmp short .done
310
311	.do_word:
312	; load 2nd parameter's value
313	mov eax, dword [edx]
314	lock xadd word [ecx], ax ; do 2 bytes XADD
315	mov word [edx], ax
316	jmp short .done
317
318	.do_byte:
319	; load 2nd parameter's value
320	mov eax, dword [edx]
321	lock xadd byte [ecx], al ; do 1 bytes XADD
322	mov byte [edx], al
323
324	.done:
325	; collect flags and return.
326	mov edx, [esp + 10h + 0] ; eflags pointer
327	pushf
328	pop dword [edx]
329
330	mov eax, VINF_SUCCESS
331	retn
332
333	; Read error - we will be here after our page fault handler.
334	GLOBALNAME EMGCEmulateLockXAdd_Error
335	mov eax, VERR_ACCESS_DENIED
336	ret
337
338	ENDPROC EMGCEmulateLockXAdd
339
340	;;
341	; Emulate XADD instruction, CDECL calling conv.
342	; VMMRCDECL(uint32_t) EMGCEmulateXAdd(RTGCPTR pu32Param1, uint32_t pu32Param2, uint32_t u32Param3, size_t cbSize, uint32_t pEflags);
343	;
344	; @returns eax=0 if data written, other code - invalid access, #PF was generated.
345	; @param [esp + 04h] Param 1 - First parameter - pointer to first parameter
346	; @param [esp + 08h] Param 2 - Second parameter - pointer to second parameter (general register)
347	; @param [esp + 0ch] Param 3 - Size of parameters, only 1/2/4 is valid.
348	; @param [esp + 10h] Param 4 - Pointer to eflags (out)
349	; @uses eax, ecx, edx
350	;
351	align 16
352	BEGINPROC EMGCEmulateXAdd
353	mov ecx, [esp + 04h + 0] ; ecx = first parameter
354	mov edx, [esp + 08h + 0] ; edx = 2nd parameter (eax)
355	mov eax, [esp + 0ch + 0] ; eax = size of parameters
356
357	cmp al, 4
358	je short .do_dword ; 4 bytes variant
359	cmp al, 2
360	je short .do_word ; 2 byte variant
361	cmp al, 1
362	je short .do_byte ; 1 bytes variant
363	int3
364
365	.do_dword:
366	; load 2nd parameter's value
367	mov eax, dword [edx]
368	xadd dword [ecx], eax ; do 4 bytes XADD
369	mov dword [edx], eax
370	jmp short .done
371
372	.do_word:
373	; load 2nd parameter's value
374	mov eax, dword [edx]
375	xadd word [ecx], ax ; do 2 bytes XADD
376	mov word [edx], ax
377	jmp short .done
378
379	.do_byte:
380	; load 2nd parameter's value
381	mov eax, dword [edx]
382	xadd byte [ecx], al ; do 1 bytes XADD
383	mov byte [edx], al
384
385	.done:
386	; collect flags and return.
387	mov edx, [esp + 10h + 0] ; eflags pointer
388	pushf
389	pop dword [edx]
390
391	mov eax, VINF_SUCCESS
392	retn
393
394	; Read error - we will be here after our page fault handler.
395	GLOBALNAME EMGCEmulateXAdd_Error
396	mov eax, VERR_ACCESS_DENIED
397	ret
398	ENDPROC EMGCEmulateXAdd

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source: vbox/trunk/src/VBox/VMM/VMMGC/EMGCA.asm@ 29287

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