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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. It was updated to do 32-byte copies using stm/ldm. \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 | .text\r | |
41 | .align 2\r | |
42 | .globl ASM_PFX(InternalMemCopyMem)\r | |
43 | \r | |
44 | ASM_PFX(InternalMemCopyMem):\r | |
45 | stmfd sp!, {r4-r11, lr}\r | |
46 | tst r0, #3\r | |
47 | mov r11, r0\r | |
48 | mov r10, r0\r | |
49 | mov ip, r2\r | |
50 | mov lr, r1\r | |
51 | movne r0, #0\r | |
52 | bne L4\r | |
53 | tst r1, #3\r | |
54 | movne r3, #0\r | |
55 | moveq r3, #1\r | |
56 | cmp r2, #31\r | |
57 | movls r0, #0\r | |
58 | andhi r0, r3, #1\r | |
59 | L4:\r | |
60 | cmp r11, r1\r | |
61 | bcc L26\r | |
62 | bls L7\r | |
63 | rsb r3, r1, r11\r | |
64 | cmp ip, r3\r | |
65 | bcc L26\r | |
66 | cmp ip, #0\r | |
67 | beq L7\r | |
68 | add r10, r11, ip\r | |
69 | add lr, ip, r1\r | |
70 | b L16\r | |
71 | L29:\r | |
72 | sub ip, ip, #8\r | |
73 | cmp ip, #7\r | |
74 | ldrd r2, [lr, #-8]!\r | |
75 | movls r0, #0\r | |
76 | cmp ip, #0\r | |
77 | strd r2, [r10, #-8]!\r | |
78 | beq L7\r | |
79 | L16:\r | |
80 | cmp r0, #0\r | |
81 | bne L29\r | |
82 | sub r3, lr, #1\r | |
83 | sub ip, ip, #1\r | |
84 | ldrb r3, [r3, #0] \r | |
85 | sub r2, r10, #1\r | |
86 | cmp ip, #0\r | |
87 | sub r10, r10, #1\r | |
88 | sub lr, lr, #1\r | |
89 | strb r3, [r2, #0]\r | |
90 | bne L16\r | |
91 | b L7\r | |
92 | L11:\r | |
93 | ldrb r3, [lr], #1 \r | |
94 | sub ip, ip, #1\r | |
95 | strb r3, [r10], #1\r | |
96 | L26:\r | |
97 | cmp ip, #0\r | |
98 | beq L7\r | |
99 | L30:\r | |
100 | cmp r0, #0\r | |
101 | beq L11\r | |
102 | sub ip, ip, #32\r | |
103 | cmp ip, #31\r | |
104 | ldmia lr!, {r2-r9}\r | |
105 | movls r0, #0\r | |
106 | cmp ip, #0\r | |
107 | stmia r10!, {r2-r9}\r | |
108 | bne L30\r | |
109 | L7:\r | |
110 | mov r0, r11\r | |
111 | ldmfd sp!, {r4-r11, pc}\r | |
112 | \r |