projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | EXPORT InternalMemCopyMem\r | |
| 41 | ||
| 42 | AREA AsmMemStuff, CODE, READONLY | |
| 43 | \r | |
| 44 | InternalMemCopyMem\r | |
| 45 | stmfd sp!, {r4-r11, lr} | |
| 46 | tst r0, #3 | |
| 47 | mov r11, r0 | |
| 48 | mov r10, 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, #31 | |
| 57 | movls r0, #0 | |
| 58 | andhi r0, r3, #1 | |
| 59 | L4 | |
| 60 | cmp r11, r1 | |
| 61 | bcc L26 | |
| 62 | bls L7 | |
| 63 | rsb r3, r1, r11 | |
| 64 | cmp ip, r3 | |
| 65 | bcc L26 | |
| 66 | cmp ip, #0 | |
| 67 | beq L7 | |
| 68 | add r10, r11, 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, [r10, #-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, r10, #1 | |
| 86 | cmp ip, #0 | |
| 87 | sub r10, r10, #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, [r10], #1 | |
| 96 | L26 | |
| 97 | cmp ip, #0 | |
| 98 | beq L7 | |
| 99 | L30 | |
| 100 | cmp r0, #0 | |
| 101 | beq L11 | |
| 102 | sub ip, ip, #32 | |
| 103 | cmp ip, #31 | |
| 104 | ldmia lr!, {r2-r9} | |
| 105 | movls r0, #0 | |
| 106 | cmp ip, #0 | |
| 107 | stmia r10!, {r2-r9} | |
| 108 | bne L30 | |
| 109 | L7 | |
| 110 | mov r0, r11 | |
| 111 | ldmfd sp!, {r4-r11, pc}\r | |
| 112 | \r | |
| 113 | END\r | |
| 114 | \r |