stack-vcc.asm@ 95845

最後變更在這個檔案從95845是 95832,由 vboxsync 提交於 3 年前
IPRT/nocrt: Moved generic compiler support code for VS 2019 out of the r3/win dir and into common/compiler/vcc. bugref:10261
屬性 svn:eol-style 設為 `native` 屬性 svn:keywords 設為 `Author Date Id Revision`
檔案大小: 10.5 KB

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1	; $Id: stack-vcc.asm 95832 2022-07-26 11:53:47Z vboxsync $
2	;; @file
3	; IPRT - Stack related Visual C++ support routines.
4	;
5
6	;
7	; Copyright (C) 2022 Oracle Corporation
8	;
9	; This file is part of VirtualBox Open Source Edition (OSE), as
10	; available from http://www.alldomusa.eu.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	; The contents of this file may alternatively be used under the terms
18	; of the Common Development and Distribution License Version 1.0
19	; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	; VirtualBox OSE distribution, in which case the provisions of the
21	; CDDL are applicable instead of those of the GPL.
22	;
23	; You may elect to license modified versions of this file under the
24	; terms and conditions of either the GPL or the CDDL or both.
25	;
26
27
28
29	;*********************************************************************************************************************************
30	;* Header Files *
31	;*********************************************************************************************************************************
32	%include "iprt/asmdefs.mac"
33	%include "iprt/x86.mac"
34
35
36	;*********************************************************************************************************************************
37	;* Structures and Typedefs *
38	;*********************************************************************************************************************************
39
40	;; Variable descriptor.
41	struc RTC_VAR_DESC_T
42	.offFrame resd 1
43	.cbVar resd 1
44	alignb RTCCPTR_CB
45	.pszName RTCCPTR_RES 1
46	endstruc
47
48	;; Frame descriptor.
49	struc RTC_FRAME_DESC_T
50	.cVars resd 1
51	alignb RTCCPTR_CB
52	.paVars RTCCPTR_RES 1 ; Array of RTC_VAR_DESC_T.
53	endstruc
54
55	;; An alloca allocation.
56	struc RTC_ALLOCA_ENTRY_T
57	.uGuard1 resd 1
58	.pNext RTCCPTR_RES 1 ; Misaligned.
59	%if ARCH_BITS == 32
60	.pNextPad resd 1
61	%endif
62	.cb RTCCPTR_RES 1 ; Misaligned.
63	%if ARCH_BITS == 32
64	.cbPad resd 1
65	%endif
66	.auGuard2 resd 3
67	endstruc
68
69	%ifdef RT_ARCH_X86
70	%define FASTCALL_NAME(a_Name, a_cbArgs) @ %+ a_Name %+ @ %+ a_cbArgs
71	%else
72	%define FASTCALL_NAME(a_Name, a_cbArgs) NAME(a_Name)
73	%endif
74
75
76	;*********************************************************************************************************************************
77	;* Defined Constants And Macros *
78	;*********************************************************************************************************************************
79	%define VARIABLE_MARKER_PRE 0xcccccccc
80	%define VARIABLE_MARKER_POST 0xcccccccc
81
82	%define ALLOCA_FILLER_BYTE 0xcc
83	%define ALLOCA_FILLER_32 0xcccccccc
84
85
86	;*********************************************************************************************************************************
87	;* Global Variables *
88	;*********************************************************************************************************************************
89	BEGINDATA
90	GLOBALNAME __security_cookie
91	dd 0xdeadbeef
92	dd 0x0c00ffe0
93
94
95	;*********************************************************************************************************************************
96	;* External Symbols *
97	;*********************************************************************************************************************************
98	BEGINCODE
99	extern NAME(_RTC_StackVarCorrupted)
100	extern NAME(_RTC_SecurityCookieMismatch)
101
102
103	BEGINPROC __GSHandlerCheck
104	int3
105	ENDPROC __GSHandlerCheck
106
107	;;
108	; Probe stack to trigger guard faults.
109	;
110	; @param eax Frame size.
111	; @uses Nothing (because we don't quite now the convention).
112	;
113	ALIGNCODE(32)
114	BEGINPROC __chkstk
115	push xBP
116	mov xBP, xSP
117	pushf
118	push xAX
119	push xBX
120
121	xor ebx, ebx
122	.again:
123	sub xBX, PAGE_SIZE
124	mov [xBP + xBX], bl
125	sub eax, PAGE_SIZE
126	jnl .again
127
128	pop xBX
129	pop xAX
130	popf
131	leave
132	ret
133	ENDPROC __chkstk
134
135
136	BEGINPROC _RTC_InitBase
137	int3
138	ENDPROC _RTC_InitBase
139
140
141	BEGINPROC _RTC_Shutdown
142	int3
143	ENDPROC _RTC_Shutdown
144
145
146
147
148	;;
149	; Checks stack variable markers.
150	;
151	; This seems to be a regular C function in the CRT, but x86 is conveniently
152	; using the fastcall convention which makes it very similar to amd64.
153	;
154	; We try make this as sleek as possible, leaving all the trouble for when we
155	; find a corrupted stack variable and need to call a C function to complain.
156	;
157	; @param pStackFrame The caller RSP/ESP. [RCX/ECX]
158	; @param pFrameDesc Frame descriptor. [RDX/EDX]
159	;
160	ALIGNCODE(64)
161	BEGINPROC FASTCALL_NAME(_RTC_CheckStackVars, 8)
162	push xBP
163
164	;
165	; Load the variable count into eax and check that it's not zero.
166	;
167	mov eax, [xDX + RTC_FRAME_DESC_T.cVars]
168	test eax, eax
169	jz .return
170
171	;
172	; Make edx/rdx point to the current variable and xBP be the frame pointer.
173	; The latter frees up xCX for scratch use and incidentally make stack access
174	; go via SS instead of DS (mostly irrlevant in 64-bit and 32-bit mode).
175	;
176	mov xDX, [xDX + RTC_FRAME_DESC_T.paVars]
177	mov xBP, xCX
178
179	;
180	; Loop thru the variables and check that their markers/fences haven't be
181	; trampled over.
182	;
183	.next_var:
184	; Marker before the variable.
185	%if ARCH_BITS == 64
186	movsxd rcx, dword [xDX + RTC_VAR_DESC_T.offFrame]
187	%else
188	mov xCX, dword [xDX + RTC_VAR_DESC_T.offFrame]
189	%endif
190	cmp dword [xBP + xCX - 4], VARIABLE_MARKER_PRE
191	jne .corrupted
192
193	; Marker after the variable.
194	add ecx, dword [xDX + RTC_VAR_DESC_T.cbVar]
195	%if ARCH_BITS == 64
196	movsxd rcx, ecx
197	%endif
198	cmp dword [xBP + xCX], VARIABLE_MARKER_POST
199	jne .corrupted
200
201	;
202	; Advance to the next variable.
203	;
204	.advance:
205	add xDX, RTC_VAR_DESC_T_size
206	dec eax
207	jnz .next_var
208
209	;
210	; Return.
211	;
212	.return:
213	pop xBP
214	ret
215
216	;
217	; Complain about corrupt variable.
218	;
219	.corrupted:
220	push xAX
221	push xDX
222	%ifdef RT_ARCH_AMD64
223	sub xSP, 28h
224	mov xCX, xBP ; frame pointer + variable descriptor.
225	%else
226	push xBP ; save EBP
227	push xDX ; parameter 2 - variable descriptor
228	push xBP ; parameter 1 - frame pointer.
229	lea xBP, [xSP + 3*xCB] ; turn it into a frame pointer during the call for better unwind.
230	%endif
231
232	call NAME(_RTC_StackVarCorrupted)
233
234	%ifdef RT_ARCH_AMD64
235	add xSP, 28h
236	%else
237	add xSP, xCB * 4 ; parameters
238	pop xBP
239	%endif
240	pop xDX
241	pop xAX
242	jmp .advance
243	ENDPROC FASTCALL_NAME(_RTC_CheckStackVars, 8)
244
245
246	;;
247	; Initialize an alloca allocation list entry and add it to it.
248	;
249	; When this is call, presumably _RTC_CheckStackVars2 is used to verify the frame.
250	;
251	; @param pNewEntry Pointer to the new entry. [RCX/ECX]
252	; @param cbEntry The entry size, including header. [RDX/EDX]
253	; @param ppHead Pointer to the list head pointer. [R8/stack]
254	;
255	ALIGNCODE(64)
256	BEGINPROC FASTCALL_NAME(_RTC_AllocaHelper, 12)
257	;
258	; Check that input isn't NULL or the size isn't zero.
259	;
260	test xCX, xCX
261	jz .return
262	test xDX, xDX
263	jz .return
264	%if ARCH_BITS == 64
265	test r8, r8
266	%else
267	cmp dword [xSP + xCB], 0
268	%endif
269	jz .return
270
271	;
272	; Memset the memory to ALLOCA_FILLER
273	;
274	%if ARCH_BITS == 64
275	mov r10, rdi ; save rdi
276	mov r11, rcx ; save pNewEntry
277	%else
278	push xDI
279	push xCX
280	cld ; paranoia
281	%endif
282
283	mov al, ALLOCA_FILLER_BYTE
284	mov xDI, xCX ; entry pointer
285	mov xCX, xDX ; entry size (in bytes)
286	rep stosb
287
288	%if ARCH_BITS == 64
289	mov rdi, r10
290	%else
291	pop xCX
292	pop xDI
293	%endif
294
295	;
296	; Fill in the entry and link it as onto the head of the chain.
297	;
298	%if ARCH_BITS == 64
299	mov [r11 + RTC_ALLOCA_ENTRY_T.cb], xDX
300	mov xAX, [r8]
301	mov [r11 + RTC_ALLOCA_ENTRY_T.pNext], xAX
302	mov [r8], r11
303	%else
304	mov [xCX + RTC_ALLOCA_ENTRY_T.cb], xDX
305	mov xAX, [xSP + xCB] ; ppHead
306	mov xDX, [xAX]
307	mov [xCX + RTC_ALLOCA_ENTRY_T.pNext], xDX
308	mov [xAX], xCX
309	%endif
310
311	.return:
312	%if ARCH_BITS == 64
313	ret
314	%else
315	ret 4
316	%endif
317	ENDPROC FASTCALL_NAME(_RTC_AllocaHelper, 12)
318
319
320	;;
321	; Checks if the secuity cookie ok, complaining and terminating if it isn't.
322	;
323	ALIGNCODE(16)
324	BEGINPROC FASTCALL_NAME(__security_check_cookie, 4)
325	cmp xCX, [__security_cookie xWrtRIP]
326	jne .corrupted
327	;; amd64 version checks if the top 16 bits are zero, we skip that for now.
328	ret
329
330	.corrupted:
331	%ifdef RT_ARCH_AMD64
332	jmp NAME(_RTC_SecurityCookieMismatch)
333	%else
334	push ebp
335	mov ebp, esp
336	push ecx
337	call NAME(_RTC_SecurityCookieMismatch)
338	pop ecx
339	leave
340	ret
341	%endif
342	ENDPROC FASTCALL_NAME(__security_check_cookie, 4)
343
344
345
346	; Not stack related stubs.
347	BEGINPROC __C_specific_handler
348	int3
349	ENDPROC __C_specific_handler
350
351
352	BEGINPROC __report_rangecheckfailure
353	int3
354	ENDPROC __report_rangecheckfailure
355

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source: vbox/trunk/src/VBox/Runtime/common/compiler/vcc/stack-vcc.asm@ 95845

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