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d39eb83c | 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. Update using VSTM/SLDM to do 128 byte copies.\r | |
8 | ;\r | |
d6ebcab7 HT |
9 | ; Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>\r |
10 | ; This program and the accompanying materials\r | |
d39eb83c | 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 | EXPORT InternalMemCopyMem\r | |
41 | ||
42 | AREA AsmMemStuff, CODE, READONLY | |
43 | \r | |
44 | InternalMemCopyMem\r | |
45 | stmfd sp!, {r4, r9, lr} | |
46 | tst r0, #3 | |
47 | mov r4, r0 | |
48 | mov r9, r0 | |
49 | mov ip, r2 | |
50 | mov lr, r1 | |
51 | movne r0, #0 | |
52 | bne L4 | |
53 | tst r1, #3 | |
54 | movne r3, #0 | |
55 | moveq r3, #1 | |
56 | cmp r2, #127 | |
57 | movls r0, #0 | |
58 | andhi r0, r3, #1 | |
59 | L4 | |
60 | cmp r4, r1 | |
61 | bcc L26 | |
62 | bls L7 | |
63 | rsb r3, r1, r4 | |
64 | cmp ip, r3 | |
65 | bcc L26 | |
66 | cmp ip, #0 | |
67 | beq L7 | |
68 | add r9, r4, ip | |
69 | add lr, ip, r1 | |
70 | b L16 | |
71 | L29 | |
72 | sub ip, ip, #8 | |
73 | cmp ip, #7 | |
74 | ldrd r2, [lr, #-8]! | |
75 | movls r0, #0 | |
76 | cmp ip, #0 | |
77 | strd r2, [r9, #-8]! | |
78 | beq L7 | |
79 | L16 | |
80 | cmp r0, #0 | |
81 | bne L29 | |
82 | sub r3, lr, #1 | |
83 | sub ip, ip, #1 | |
84 | ldrb r3, [r3, #0] | |
85 | sub r2, r9, #1 | |
86 | cmp ip, #0 | |
87 | sub r9, r9, #1 | |
88 | sub lr, lr, #1 | |
89 | strb r3, [r2, #0] | |
90 | bne L16 | |
91 | b L7 | |
92 | L11 | |
93 | ldrb r3, [lr], #1 | |
94 | sub ip, ip, #1 | |
95 | strb r3, [r9], #1 | |
96 | L26 | |
97 | cmp ip, #0 | |
98 | beq L7 | |
99 | L30 | |
100 | cmp r0, #0 | |
101 | beq L11 | |
102 | sub ip, ip, #128 // 32 | |
103 | cmp ip, #127 // 31 | |
104 | vldm lr!, {d0-d15} | |
105 | movls r0, #0 | |
106 | cmp ip, #0 | |
107 | vstm r9!, {d0-d15} | |
108 | bne L30 | |
109 | L7 | |
110 | dsb | |
111 | mov r0, r4 | |
112 | ldmfd sp!, {r4, r9, pc} | |
113 | \r | |
114 | END\r | |
115 | \r |