PGMR3DbgA.asm@ 106952

Last change on this file since 106952 was 106061, checked in by vboxsync, 2 months ago
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1	; $Id: PGMR3DbgA.asm 106061 2024-09-16 14:03:52Z vboxsync $
2	;; @file
3	; PGM - Page Manager and Monitor - Debugger & Debugging API Optimizations.
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 "VBox/asmdefs.mac"
34
35	BEGINCODE ;; Doesn't end up in code seg on 64-bit darwin. weird.
36
37
38	;
39	; Common to all code below.
40	;
41	%ifdef ASM_CALL64_MSC
42	%define pvNeedle r8
43	%define cbNeedle r9d
44	%define bTmp dl
45	%elifdef ASM_CALL64_GCC
46	%define pvNeedle rdx
47	%define cbNeedle esi
48	%define bTmp r9b
49	%elifdef RT_ARCH_X86
50	%define pvNeedle dword [esp + 8h]
51	%define cbNeedle dword [esp + 10h]
52	%else
53	%error "Unsupported arch!"
54	%endif
55
56	;;
57	; Searches for a 8 byte needle in steps of 8.
58	;
59	; In 32-bit mode, this will only actually search for a 8 byte needle.
60	;
61	; @param pbHaystack [msc:rcx, gcc:rdi, x86:ebp+08h] What to search thru.
62	; @param cbHaystack [msc:edx, gcc:rsi, x86:ebp+0ch] The amount of hay to search.
63	; @param pvNeedle [msc:r8, gcc:rdx, x86:ebp+10h] What we're searching for
64	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
65	;
66	; @remarks ASSUMES pbHaystack is aligned at uAlign.
67	;
68	BEGINPROC pgmR3DbgFixedMemScan8Wide8Step
69	%ifdef ASM_CALL64_MSC
70	mov r10, rdi ; save it
71	mov rdi, rcx ; rdi=pbHaystack
72	mov ecx, edx ; rcx=cbHaystack
73	mov rax, [r8] ; (uint64_t )pvNeedle
74	%elifdef ASM_CALL64_GCC
75	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
76	mov rax, [rdx] ; (uint64_t )pvNeedle
77	%elifdef RT_ARCH_X86
78	push ebp
79	mov ebp, esp
80	push edi ; save it
81	mov edi, [ebp + 08h] ; pbHaystack
82	mov ecx, [ebp + 0ch] ; cbHaystack
83	mov eax, [ebp + 10h] ; pvNeedle
84	mov edx, [eax + 4] ; ((uint32_t *)pvNeedle)[1]
85	mov eax, [eax] ; ((uint32_t *)pvNeedle)[0]
86	%else
87	%error "Unsupported arch!"
88	%endif
89	SEH64_END_PROLOGUE
90
91	%ifdef RT_ARCH_X86
92	;
93	; No string instruction to help us here. Do a simple tight loop instead.
94	;
95	shr ecx, 3
96	jz .return_null
97	.again:
98	cmp [edi], eax
99	je .needle_check
100	.continue:
101	add edi, 8
102	dec ecx
103	jnz .again
104	jmp .return_null
105
106	; Check the needle 2nd dword, caller can do the rest.
107	.needle_check:
108	cmp edx, [edi + 4]
109	jne .continue
110
111	.return_edi:
112	mov eax, edi
113
114	%else ; RT_ARCH_AMD64
115	cmp ecx, 8
116	jb .return_null
117	.continue:
118	shr ecx, 3
119	repne scasq
120	jne .return_null
121	; check more of the needle if we can.
122	mov r11d, 8
123	shl ecx, 3
124	.needle_check:
125	cmp cbNeedle, r11d
126	je .return_edi
127	cmp ecx, r11d
128	jb .return_edi ; returns success here as we've might've lost stuff while shifting ecx around.
129	mov bTmp, [pvNeedle + r11]
130	cmp bTmp, [xDI + r11 - 8]
131	jne .continue
132	inc r11d
133	jmp .needle_check
134
135	.return_edi:
136	lea xAX, [xDI - 8]
137	%endif ; RT_ARCH_AMD64
138
139	.return:
140	%ifdef ASM_CALL64_MSC
141	mov rdi, r10
142	%elifdef RT_ARCH_X86
143	pop edi
144	leave
145	%endif
146	ret
147
148	.return_null:
149	xor eax, eax
150	jmp .return
151	ENDPROC pgmR3DbgFixedMemScan8Wide8Step
152
153
154	;;
155	; Searches for a 4 byte needle in steps of 4.
156	;
157	; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
158	; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
159	; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
160	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
161	;
162	; @remarks ASSUMES pbHaystack is aligned at uAlign.
163	;
164	BEGINPROC pgmR3DbgFixedMemScan4Wide4Step
165	%ifdef ASM_CALL64_MSC
166	mov r10, rdi ; save it
167	mov rdi, rcx ; rdi=pbHaystack
168	mov ecx, edx ; rcx=cbHaystack
169	mov eax, [r8] ; (uint32_t )pvNeedle
170	%elifdef ASM_CALL64_GCC
171	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
172	mov eax, [rdx] ; (uint32_t )pvNeedle
173	%elifdef RT_ARCH_X86
174	mov edx, edi ; save it
175	mov edi, [esp + 04h] ; pbHaystack
176	mov ecx, [esp + 08h] ; cbHaystack
177	mov eax, [esp + 0ch] ; pvNeedle
178	mov eax, [eax] ; (uint32_t )pvNeedle
179	%else
180	%error "Unsupported arch!"
181	%endif
182	SEH64_END_PROLOGUE
183
184	.continue:
185	cmp ecx, 4
186	jb .return_null
187	shr ecx, 2
188	repne scasd
189	jne .return_null
190
191	%ifdef RT_ARCH_AMD64
192	; check more of the needle if we can.
193	mov r11d, 4
194	.needle_check:
195	cmp cbNeedle, r11d
196	je .return_edi
197	cmp ecx, r11d ; don't bother converting ecx to bytes.
198	jb .return_edi
199	mov bTmp, [pvNeedle + r11]
200	cmp bTmp, [xDI + r11 - 4]
201	jne .continue
202	inc r11d
203	jmp .needle_check
204	%endif
205
206	.return_edi:
207	lea xAX, [xDI - 4]
208	.return:
209	%ifdef ASM_CALL64_MSC
210	mov rdi, r10
211	%elifdef RT_ARCH_X86
212	mov edi, edx
213	%endif
214	ret
215
216	.return_null:
217	xor eax, eax
218	jmp .return
219	ENDPROC pgmR3DbgFixedMemScan4Wide4Step
220
221
222	;;
223	; Searches for a 2 byte needle in steps of 2.
224	;
225	; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
226	; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
227	; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
228	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
229	;
230	; @remarks ASSUMES pbHaystack is aligned at uAlign.
231	;
232	BEGINPROC pgmR3DbgFixedMemScan2Wide2Step
233	%ifdef ASM_CALL64_MSC
234	mov r10, rdi ; save it
235	mov rdi, rcx ; rdi=pbHaystack
236	mov ecx, edx ; rcx=cbHaystack
237	mov ax, [r8] ; (uint16_t )pvNeedle
238	%elifdef ASM_CALL64_GCC
239	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
240	mov ax, [rdx] ; (uint16_t )pvNeedle
241	%elifdef RT_ARCH_X86
242	mov edx, edi ; save it
243	mov edi, [esp + 04h] ; pbHaystack
244	mov ecx, [esp + 08h] ; cbHaystack
245	mov eax, [esp + 0ch] ; pvNeedle
246	mov ax, [eax] ; (uint16_t )pvNeedle
247	%else
248	%error "Unsupported arch!"
249	%endif
250	SEH64_END_PROLOGUE
251
252	.continue:
253	cmp ecx, 2
254	jb .return_null
255	shr ecx, 1
256	repne scasw
257	jne .return_null
258
259	%ifdef RT_ARCH_AMD64
260	; check more of the needle if we can.
261	mov r11d, 2
262	.needle_check:
263	cmp cbNeedle, r11d
264	je .return_edi
265	cmp ecx, r11d ; don't bother converting ecx to bytes.
266	jb .return_edi
267	mov bTmp, [pvNeedle + r11]
268	cmp bTmp, [xDI + r11 - 2]
269	jne .continue
270	inc r11d
271	jmp .needle_check
272	%endif
273
274	.return_edi:
275	lea xAX, [xDI - 2]
276	.return:
277	%ifdef ASM_CALL64_MSC
278	mov rdi, r10
279	%elifdef RT_ARCH_X86
280	mov edi, edx
281	%endif
282	ret
283
284	.return_null:
285	xor eax, eax
286	jmp .return
287	ENDPROC pgmR3DbgFixedMemScan2Wide2Step
288
289
290	;;
291	; Searches for a 1 byte needle in steps of 1.
292	;
293	; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
294	; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
295	; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
296	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
297	;
298	BEGINPROC pgmR3DbgFixedMemScan1Wide1Step
299	%ifdef ASM_CALL64_MSC
300	mov r10, rdi ; save it
301	mov rdi, rcx ; rdi=pbHaystack
302	mov ecx, edx ; rcx=cbHaystack
303	mov al, [r8] ; (uint8_t )pvNeedle
304	%elifdef ASM_CALL64_GCC
305	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
306	mov al, [rdx] ; (uint8_t )pvNeedle
307	%elifdef RT_ARCH_X86
308	mov edx, edi ; save it
309	mov edi, [esp + 04h] ; pbHaystack
310	mov ecx, [esp + 08h] ; cbHaystack
311	mov eax, [esp + 0ch] ; pvNeedle
312	mov al, [eax] ; (uint8_t )pvNeedle
313	%else
314	%error "Unsupported arch!"
315	%endif
316	SEH64_END_PROLOGUE
317
318	cmp ecx, 1
319	jb .return_null
320	.continue:
321	repne scasb
322	jne .return_null
323
324	%ifdef RT_ARCH_AMD64
325	; check more of the needle if we can.
326	mov r11d, 1
327	.needle_check:
328	cmp cbNeedle, r11d
329	je .return_edi
330	cmp ecx, r11d
331	jb .return_edi
332	mov bTmp, [pvNeedle + r11]
333	cmp bTmp, [xDI + r11 - 1]
334	jne .continue
335	inc r11d
336	jmp .needle_check
337	%endif
338
339	.return_edi:
340	lea xAX, [xDI - 1]
341	.return:
342	%ifdef ASM_CALL64_MSC
343	mov rdi, r10
344	%elifdef RT_ARCH_X86
345	mov edi, edx
346	%endif
347	ret
348
349	.return_null:
350	xor eax, eax
351	%ifdef ASM_CALL64_MSC
352	mov rdi, r10
353	%elifdef RT_ARCH_X86
354	mov edi, edx
355	%endif
356	ret
357	ENDPROC pgmR3DbgFixedMemScan1Wide1Step
358
359
360	;;
361	; Searches for a 4 byte needle in steps of 1.
362	;
363	; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
364	; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
365	; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
366	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
367	;
368	BEGINPROC pgmR3DbgFixedMemScan4Wide1Step
369	%ifdef ASM_CALL64_MSC
370	mov r10, rdi ; save it
371	mov rdi, rcx ; rdi=pbHaystack
372	mov ecx, edx ; rcx=cbHaystack
373	mov eax, [r8] ; (uint32_t )pvNeedle
374	%elifdef ASM_CALL64_GCC
375	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
376	mov eax, [rdx] ; (uint32_t )pvNeedle
377	%elifdef RT_ARCH_X86
378	mov edx, edi ; save it
379	mov edi, [esp + 04h] ; pbHaystack
380	mov ecx, [esp + 08h] ; cbHaystack
381	mov eax, [esp + 0ch] ; pvNeedle
382	mov eax, [eax] ; (uint32_t )pvNeedle
383	%else
384	%error "Unsupported arch!"
385	%endif
386	SEH64_END_PROLOGUE
387
388	cmp ecx, 1
389	jb .return_null
390	.continue:
391	repne scasb
392	jne .return_null
393	cmp ecx, 3
394	jb .return_null
395	cmp eax, [xDI - 1]
396	jne .continue
397
398	.return_edi:
399	lea xAX, [xDI - 1]
400	.return:
401	%ifdef ASM_CALL64_MSC
402	mov rdi, r10
403	%elifdef RT_ARCH_X86
404	mov edi, edx
405	%endif
406	ret
407
408	.return_null:
409	xor eax, eax
410	%ifdef ASM_CALL64_MSC
411	mov rdi, r10
412	%elifdef RT_ARCH_X86
413	mov edi, edx
414	%endif
415	ret
416	ENDPROC pgmR3DbgFixedMemScan4Wide1Step
417
418	;;
419	; Searches for a 8 byte needle in steps of 1.
420	;
421	; @param pbHaystack [msc:rcx, gcc:rdi, x86:esp+04h] What to search thru.
422	; @param cbHaystack [msc:edx, gcc:rsi, x86:esp+08h] The amount of hay to search.
423	; @param pvNeedle [msc:r8, gcc:rdx, x86:esp+0ch] What we're searching for
424	; @param cbNeedle [msc:r9, gcc:rcx, x86:esp+10h] Size of what we're searcing for. Currently ignored.
425	;
426	; @remarks The 32-bit version is currently identical to pgmR3DbgFixedMemScan4Wide1Step.
427	;
428	BEGINPROC pgmR3DbgFixedMemScan8Wide1Step
429	%ifdef ASM_CALL64_MSC
430	mov r10, rdi ; save it
431	mov rdi, rcx ; rdi=pbHaystack
432	mov ecx, edx ; rcx=cbHaystack
433	mov rax, [r8] ; (uint64_t )pvNeedle
434	%elifdef ASM_CALL64_GCC
435	xchg rcx, rsi ; rcx=cbHaystack, rsi=cbNeedle
436	mov rax, [rdx] ; (uint64_t )pvNeedle
437	%elifdef RT_ARCH_X86
438	mov edx, edi ; save it
439	mov edi, [esp + 04h] ; pbHaystack
440	mov ecx, [esp + 08h] ; cbHaystack
441	mov eax, [esp + 0ch] ; pvNeedle
442	mov eax, [eax] ; (uint32_t )pvNeedle
443	%else
444	%error "Unsupported arch!"
445	%endif
446	SEH64_END_PROLOGUE
447
448	cmp ecx, 1
449	jb .return_null
450	.continue:
451	repne scasb
452	jne .return_null
453	%ifdef RT_ARCH_AMD64
454	cmp ecx, 7
455	jb .check_smaller
456	cmp rax, [xDI - 1]
457	jne .continue
458	jmp .return_edi
459	.check_smaller:
460	%endif
461	cmp ecx, 3
462	jb .return_null
463	cmp eax, [xDI - 1]
464	jne .continue
465
466	.return_edi:
467	lea xAX, [xDI - 1]
468	.return:
469	%ifdef ASM_CALL64_MSC
470	mov rdi, r10
471	%elifdef RT_ARCH_X86
472	mov edi, edx
473	%endif
474	ret
475
476	.return_null:
477	xor eax, eax
478	%ifdef ASM_CALL64_MSC
479	mov rdi, r10
480	%elifdef RT_ARCH_X86
481	mov edi, edx
482	%endif
483	ret
484	ENDPROC pgmR3DbgFixedMemScan8Wide1Step
485

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source: vbox/trunk/src/VBox/VMM/VMMR3/PGMR3DbgA.asm@ 106952

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