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1 | ;; |
2 | ;; Copyright (c) 2019, Intel Corporation | |
3 | ;; | |
4 | ;; Redistribution and use in source and binary forms, with or without | |
5 | ;; modification, are permitted provided that the following conditions are met: | |
6 | ;; | |
7 | ;; * Redistributions of source code must retain the above copyright notice, | |
8 | ;; this list of conditions and the following disclaimer. | |
9 | ;; * Redistributions in binary form must reproduce the above copyright | |
10 | ;; notice, this list of conditions and the following disclaimer in the | |
11 | ;; documentation and/or other materials provided with the distribution. | |
12 | ;; * Neither the name of Intel Corporation nor the names of its contributors | |
13 | ;; may be used to endorse or promote products derived from this software | |
14 | ;; without specific prior written permission. | |
15 | ;; | |
16 | ;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
17 | ;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
18 | ;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
19 | ;; DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE | |
20 | ;; FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
21 | ;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
22 | ;; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | |
23 | ;; CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | |
24 | ;; OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
25 | ;; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
26 | ;; | |
27 | ||
28 | %include "include/os.asm" | |
29 | %include "include/clear_regs.asm" | |
30 | ||
31 | section .text | |
32 | ; | |
33 | ; This function clears all scratch GP registers | |
34 | ; | |
35 | ; void clear_scratch_gps(void) | |
36 | MKGLOBAL(clear_scratch_gps,function,internal) | |
37 | clear_scratch_gps: | |
38 | ||
39 | clear_scratch_gps_asm | |
40 | ||
41 | ret | |
42 | ||
43 | ; | |
44 | ; This function clears all scratch XMM registers | |
45 | ; | |
46 | ; void clear_scratch_xmms_sse(void) | |
47 | MKGLOBAL(clear_scratch_xmms_sse,function,internal) | |
48 | clear_scratch_xmms_sse: | |
49 | ||
50 | clear_scratch_xmms_sse_asm | |
51 | ||
52 | ret | |
53 | ||
54 | ; | |
55 | ; This function clears all scratch XMM registers | |
56 | ; | |
57 | ; It should be called before restoring the XMM registers | |
58 | ; for Windows (XMM6-XMM15) | |
59 | ; | |
60 | ; void clear_scratch_xmms_avx(void) | |
61 | MKGLOBAL(clear_scratch_xmms_avx,function,internal) | |
62 | clear_scratch_xmms_avx: | |
63 | ||
64 | clear_scratch_xmms_avx_asm | |
65 | ||
66 | ret | |
67 | ||
68 | ; | |
69 | ; This function clears all scratch YMM registers | |
70 | ; | |
71 | ; It should be called before restoring the XMM registers | |
72 | ; for Windows (XMM6-XMM15) | |
73 | ; | |
74 | ; void clear_scratch_ymms(void) | |
75 | MKGLOBAL(clear_scratch_ymms,function,internal) | |
76 | clear_scratch_ymms: | |
77 | ||
78 | clear_scratch_ymms_asm | |
79 | ||
80 | ret | |
81 | ||
82 | ; | |
83 | ; This function clears all scratch ZMM registers | |
84 | ; | |
85 | ; It should be called before restoring the XMM registers | |
86 | ; for Windows (XMM6-XMM15). YMM registers are used | |
87 | ; on purpose, since XOR'ing YMM registers is faster | |
88 | ; than XOR'ing ZMM registers, and the operation clears | |
89 | ; also the upper 256 bits | |
90 | ; | |
91 | ; void clear_scratch_zmms(void) | |
92 | MKGLOBAL(clear_scratch_zmms,function,internal) | |
93 | clear_scratch_zmms: | |
94 | ||
95 | clear_scratch_zmms_asm | |
96 | ||
97 | ret | |
98 | ||
99 | ; | |
100 | ; This function clears all memory passed | |
101 | ; | |
102 | ; void force_memset_zero(void *mem, const size_t size) | |
103 | MKGLOBAL(force_memset_zero,function,internal) | |
104 | force_memset_zero: | |
105 | ||
106 | %ifdef LINUX | |
107 | mov rcx, rsi | |
108 | %else | |
109 | push rdi | |
110 | mov rdi, rcx | |
111 | mov rcx, rdx | |
112 | %endif | |
113 | xor eax, eax | |
114 | cld | |
115 | rep stosb | |
116 | ||
117 | %ifndef LINUX | |
118 | pop rdi | |
119 | %endif | |
120 | ret | |
121 | ||
122 | %ifdef LINUX | |
123 | section .note.GNU-stack noalloc noexec nowrite progbits | |
124 | %endif |