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1 | ;------------------------------------------------------------------------------ \r | |
2 | ;\r | |
3 | ; CopyMem() worker for ARM\r | |
4 | ;\r | |
5 | ; This file started out as C code that did 64 bit moves if the buffer was\r | |
6 | ; 32-bit aligned, else it does a byte copy. It also does a byte copy for\r | |
7 | ; any trailing bytes. It was updated to do 32-byte copies using stm/ldm.\r | |
8 | ;\r | |
9 | ; Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r | |
10 | ; This program and the accompanying materials\r | |
11 | ; are licensed and made available under the terms and conditions of the BSD License\r | |
12 | ; which accompanies this distribution. The full text of the license may be found at\r | |
13 | ; http://opensource.org/licenses/bsd-license.php\r | |
14 | ;\r | |
15 | ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
16 | ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
17 | ;\r | |
18 | ;------------------------------------------------------------------------------\r | |
19 | \r | |
20 | /**\r | |
21 | Copy Length bytes from Source to Destination. Overlap is OK.\r | |
22 | \r | |
23 | This implementation \r | |
24 | \r | |
25 | @param Destination Target of copy\r | |
26 | @param Source Place to copy from\r | |
27 | @param Length Number of bytes to copy\r | |
28 | \r | |
29 | @return Destination\r | |
30 | \r | |
31 | \r | |
32 | VOID *\r | |
33 | EFIAPI\r | |
34 | InternalMemCopyMem (\r | |
35 | OUT VOID *DestinationBuffer,\r | |
36 | IN CONST VOID *SourceBuffer,\r | |
37 | IN UINTN Length\r | |
38 | )\r | |
39 | **/\r | |
40 | \s\sEXPORT InternalMemCopyMem\r | |
41 | ||
42 | \s\sAREA AsmMemStuff, CODE, READONLY | |
43 | \r | |
44 | InternalMemCopyMem\r | |
45 | \s\sstmfd\s\ssp!, {r4-r11, lr} | |
46 | \s\stst\s\sr0, #3 | |
47 | \s\smov\s\sr11, r0 | |
48 | \s\smov\s\sr10, r0 | |
49 | \s\smov\s\sip, r2 | |
50 | \s\smov\s\slr, r1 | |
51 | \s\smovne\s\sr0, #0 | |
52 | \s\sbne\s\sL4 | |
53 | \s\stst\s\sr1, #3 | |
54 | \s\smovne\s\sr3, #0 | |
55 | \s\smoveq\s\sr3, #1 | |
56 | \s\scmp\s\sr2, #31 | |
57 | \s\smovls\s\sr0, #0 | |
58 | \s\sandhi\s\sr0, r3, #1 | |
59 | L4 | |
60 | \s\scmp\s\sr11, r1 | |
61 | \s\sbcc\s\sL26 | |
62 | \s\sbls\s\sL7 | |
63 | \s\srsb\s\sr3, r1, r11 | |
64 | \s\scmp\s\sip, r3 | |
65 | \s\sbcc\s\sL26 | |
66 | \s\scmp\s\sip, #0 | |
67 | \s\sbeq\s\sL7 | |
68 | \s\sadd\s\sr10, r11, ip | |
69 | \s\sadd\s\slr, ip, r1 | |
70 | \s\sb\s\sL16 | |
71 | L29 | |
72 | \s\ssub\s\sip, ip, #8 | |
73 | \s\scmp\s\sip, #7 | |
74 | \s\sldrd\s\sr2, [lr, #-8]! | |
75 | \s\smovls\s\sr0, #0 | |
76 | \s\scmp\s\sip, #0 | |
77 | \s\sstrd\s\sr2, [r10, #-8]! | |
78 | \s\sbeq\s\sL7 | |
79 | L16 | |
80 | \s\scmp\s\sr0, #0 | |
81 | \s\sbne\s\sL29 | |
82 | \s\ssub\s\sr3, lr, #1 | |
83 | \s\ssub\s\sip, ip, #1 | |
84 | \s\sldrb\s\sr3, [r3, #0]\s\s | |
85 | \s\ssub\s\sr2, r10, #1 | |
86 | \s\scmp\s\sip, #0 | |
87 | \s\ssub\s\sr10, r10, #1 | |
88 | \s\ssub\s\slr, lr, #1 | |
89 | \s\sstrb\s\sr3, [r2, #0] | |
90 | \s\sbne\s\sL16 | |
91 | \s\sb L7 | |
92 | L11 | |
93 | \s\sldrb\s\sr3, [lr], #1\s\s | |
94 | \s\ssub\s\sip, ip, #1 | |
95 | \s\sstrb\s\sr3, [r10], #1 | |
96 | L26 | |
97 | \s\scmp\s\sip, #0 | |
98 | \s\sbeq\s\sL7 | |
99 | L30 | |
100 | \s\scmp\s\sr0, #0 | |
101 | \s\sbeq\s\sL11 | |
102 | \s\ssub\s\sip, ip, #32 | |
103 | \s\scmp\s\sip, #31 | |
104 | \s\sldmia\s\slr!, {r2-r9} | |
105 | \s\smovls\s\sr0, #0 | |
106 | \s\scmp\s\sip, #0 | |
107 | \s\sstmia\s\sr10!, {r2-r9} | |
108 | \s\sbne\s\sL30 | |
109 | L7 | |
110 | mov\s\sr0, r11 | |
111 | \s\sldmfd\s\ssp!, {r4-r11, pc}\r | |
112 | \s\s\r | |
113 | END\r | |
114 | \r |