1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
| ; RUN: llc -mtriple=i386-pc-windows-msvc < %s -o - | FileCheck -check-prefix=MSVC-X86 %s
; RUN: llc -mtriple=x86_64-pc-windows-msvc < %s -o - | FileCheck -check-prefix=MSVC-X64 %s
; Make sure fastisel falls back and does something secure.
; RUN: llc -mtriple=i686-pc-windows-msvc -O0 < %s -o - | FileCheck -check-prefix=MSVC-X86-O0 %s
; RUN: llc -mtriple=x86_64-pc-windows-msvc -O0 < %s -o - | FileCheck -check-prefix=MSVC-X64-O0 %s
@"\01LC" = internal constant [11 x i8] c"buf == %s\0A\00" ; <[11 x i8]*> [#uses=1]
define void @test(i8* %a) nounwind ssp {
entry:
%a_addr = alloca i8* ; <i8**> [#uses=2]
%buf = alloca [8 x i8] ; <[8 x i8]*> [#uses=2]
store i8* %a, i8** %a_addr
%buf1 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
%0 = load i8*, i8** %a_addr, align 4 ; <i8*> [#uses=1]
%1 = call i8* @strcpy(i8* %buf1, i8* %0) nounwind ; <i8*> [#uses=0]
%buf2 = bitcast [8 x i8]* %buf to i8* ; <i8*> [#uses=1]
%2 = call i32 (i8*, ...) @printf(i8* getelementptr ([11 x i8], [11 x i8]* @"\01LC", i32 0, i32 0), i8* %buf2) nounwind ; <i32> [#uses=0]
br label %return
return: ; preds = %entry
ret void
}
; MSVC-X86-LABEL: _test:
; MSVC-X86: movl ___security_cookie, %[[REG1:[^ ]*]]
; MSVC-X86: xorl %esp, %[[REG1]]
; MSVC-X86: movl %[[REG1]], [[SLOT:[0-9]*]](%esp)
; MSVC-X86: calll _strcpy
; MSVC-X86: movl [[SLOT]](%esp), %ecx
; MSVC-X86: xorl %esp, %ecx
; MSVC-X86: calll @__security_check_cookie@4
; MSVC-X86: retl
; MSVC-X64-LABEL: test:
; MSVC-X64: movq __security_cookie(%rip), %[[REG1:[^ ]*]]
; MSVC-X64: xorq %rsp, %[[REG1]]
; MSVC-X64: movq %[[REG1]], [[SLOT:[0-9]*]](%rsp)
; MSVC-X64: callq strcpy
; MSVC-X64: movq [[SLOT]](%rsp), %rcx
; MSVC-X64: xorq %rsp, %rcx
; MSVC-X64: callq __security_check_cookie
; MSVC-X64: retq
; MSVC-X86-O0-LABEL: _test:
; MSVC-X86-O0: movl ___security_cookie, %[[REG1:[^ ]*]]
; MSVC-X86-O0: xorl %esp, %[[REG1]]
; MSVC-X86-O0: movl %[[REG1]], [[SLOT:[0-9]*]](%esp)
; MSVC-X86-O0: calll _strcpy
; MSVC-X86-O0: movl [[SLOT]](%esp), %[[REG1:[^ ]*]]
; MSVC-X86-O0: xorl %esp, %[[REG1]]
; MSVC-X86-O0: movl %[[REG1]], %ecx
; MSVC-X86-O0: calll @__security_check_cookie@4
; MSVC-X86-O0: retl
; MSVC-X64-O0-LABEL: test:
; MSVC-X64-O0: movq __security_cookie(%rip), %[[REG1:[^ ]*]]
; MSVC-X64-O0: xorq %rsp, %[[REG1]]
; MSVC-X64-O0: movq %[[REG1]], [[SLOT:[0-9]*]](%rsp)
; MSVC-X64-O0: callq strcpy
; MSVC-X64-O0: movq [[SLOT]](%rsp), %[[REG1:[^ ]*]]
; MSVC-X64-O0: xorq %rsp, %[[REG1]]
; MSVC-X64-O0: movq %[[REG1]], %rcx
; MSVC-X64-O0: callq __security_check_cookie
; MSVC-X64-O0: retq
declare void @escape(i32*)
define void @test_vla(i32 %n) nounwind ssp {
%vla = alloca i32, i32 %n
call void @escape(i32* %vla)
ret void
}
; MSVC-X86-LABEL: _test_vla:
; MSVC-X86: pushl %ebp
; MSVC-X86: movl %esp, %ebp
; MSVC-X86: movl ___security_cookie, %[[REG1:[^ ]*]]
; MSVC-X86: xorl %ebp, %[[REG1]]
; MSVC-X86: movl %[[REG1]], [[SLOT:-[0-9]*]](%ebp)
; MSVC-X86: calll __chkstk
; MSVC-X86: pushl
; MSVC-X86: calll _escape
; MSVC-X86: movl [[SLOT]](%ebp), %ecx
; MSVC-X86: xorl %ebp, %ecx
; MSVC-X86: calll @__security_check_cookie@4
; MSVC-X86: movl %ebp, %esp
; MSVC-X86: popl %ebp
; MSVC-X86: retl
; MSVC-X64-LABEL: test_vla:
; MSVC-X64: pushq %rbp
; MSVC-X64: subq $16, %rsp
; MSVC-X64: leaq 16(%rsp), %rbp
; MSVC-X64: movq __security_cookie(%rip), %[[REG1:[^ ]*]]
; MSVC-X64: xorq %rbp, %[[REG1]]
; MSVC-X64: movq %[[REG1]], [[SLOT:-[0-9]*]](%rbp)
; MSVC-X64: callq __chkstk
; MSVC-X64: callq escape
; MSVC-X64: movq [[SLOT]](%rbp), %rcx
; MSVC-X64: xorq %rbp, %rcx
; MSVC-X64: callq __security_check_cookie
; MSVC-X64: retq
; This case is interesting because we address local variables with RBX but XOR
; the guard value with RBP. That's fine, either value will do, as long as they
; are the same across the life of the frame.
define void @test_vla_realign(i32 %n) nounwind ssp {
%realign = alloca i32, align 32
%vla = alloca i32, i32 %n
call void @escape(i32* %realign)
call void @escape(i32* %vla)
ret void
}
; MSVC-X86-LABEL: _test_vla_realign:
; MSVC-X86: pushl %ebp
; MSVC-X86: movl %esp, %ebp
; MSVC-X86: pushl %esi
; MSVC-X86: andl $-32, %esp
; MSVC-X86: subl $32, %esp
; MSVC-X86: movl %esp, %esi
; MSVC-X86: movl ___security_cookie, %[[REG1:[^ ]*]]
; MSVC-X86: xorl %ebp, %[[REG1]]
; MSVC-X86: movl %[[REG1]], [[SLOT:[0-9]*]](%esi)
; MSVC-X86: calll __chkstk
; MSVC-X86: pushl
; MSVC-X86: calll _escape
; MSVC-X86: movl [[SLOT]](%esi), %ecx
; MSVC-X86: xorl %ebp, %ecx
; MSVC-X86: calll @__security_check_cookie@4
; MSVC-X86: leal -8(%ebp), %esp
; MSVC-X86: popl %esi
; MSVC-X86: popl %ebp
; MSVC-X86: retl
; MSVC-X64-LABEL: test_vla_realign:
; MSVC-X64: pushq %rbp
; MSVC-X64: pushq %rbx
; MSVC-X64: subq $32, %rsp
; MSVC-X64: leaq 32(%rsp), %rbp
; MSVC-X64: andq $-32, %rsp
; MSVC-X64: movq %rsp, %rbx
; MSVC-X64: movq __security_cookie(%rip), %[[REG1:[^ ]*]]
; MSVC-X64: xorq %rbp, %[[REG1]]
; MSVC-X64: movq %[[REG1]], [[SLOT:[0-9]*]](%rbx)
; MSVC-X64: callq __chkstk
; MSVC-X64: callq escape
; MSVC-X64: movq [[SLOT]](%rbx), %rcx
; MSVC-X64: xorq %rbp, %rcx
; MSVC-X64: callq __security_check_cookie
; MSVC-X64: retq
declare i8* @strcpy(i8*, i8*) nounwind
declare i32 @printf(i8*, ...) nounwind
|