1 ;------------------------------------------------------------------------------ 2 ; 3 ; CopyMem() worker for ARM 4 ; 5 ; This file started out as C code that did 64 bit moves if the buffer was 6 ; 32-bit aligned, else it does a byte copy. It also does a byte copy for 7 ; any trailing bytes. Update using VSTM/SLDM to do 128 byte copies. 8 ; 9 ; Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR> 10 ; This program and the accompanying materials 11 ; are licensed and made available under the terms and conditions of the BSD License 12 ; which accompanies this distribution. The full text of the license may be found at 13 ; http://opensource.org/licenses/bsd-license.php 14 ; 15 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 16 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 17 ; 18 ;------------------------------------------------------------------------------ 19 20 /** 21 Copy Length bytes from Source to Destination. Overlap is OK. 22 23 This implementation 24 25 @param Destination Target of copy 26 @param Source Place to copy from 27 @param Length Number of bytes to copy 28 29 @return Destination 30 31 32 VOID * 33 EFIAPI 34 InternalMemCopyMem ( 35 OUT VOID *DestinationBuffer, 36 IN CONST VOID *SourceBuffer, 37 IN UINTN Length 38 ) 39 **/ 40 41 INCLUDE AsmMacroExport.inc 42 43 RVCT_ASM_EXPORT InternalMemCopyMem 44 stmfd sp!, {r4, r9, lr} 45 tst r0, #3 46 mov r4, r0 47 mov r9, r0 48 mov ip, r2 49 mov lr, r1 50 movne r0, #0 51 bne L4 52 tst r1, #3 53 movne r3, #0 54 moveq r3, #1 55 cmp r2, #127 56 movls r0, #0 57 andhi r0, r3, #1 58 L4 59 cmp r4, r1 60 bcc L26 61 bls L7 62 rsb r3, r1, r4 63 cmp ip, r3 64 bcc L26 65 cmp ip, #0 66 beq L7 67 add r9, r4, ip 68 add lr, ip, r1 69 b L16 70 L29 71 sub ip, ip, #8 72 cmp ip, #7 73 ldrd r2, [lr, #-8]! 74 movls r0, #0 75 cmp ip, #0 76 strd r2, [r9, #-8]! 77 beq L7 78 L16 79 cmp r0, #0 80 bne L29 81 sub r3, lr, #1 82 sub ip, ip, #1 83 ldrb r3, [r3, #0] 84 sub r2, r9, #1 85 cmp ip, #0 86 sub r9, r9, #1 87 sub lr, lr, #1 88 strb r3, [r2, #0] 89 bne L16 90 b L7 91 L11 92 ldrb r3, [lr], #1 93 sub ip, ip, #1 94 strb r3, [r9], #1 95 L26 96 cmp ip, #0 97 beq L7 98 L30 99 cmp r0, #0 100 beq L11 101 sub ip, ip, #128 // 32 102 cmp ip, #127 // 31 103 vldm lr!, {d0-d15} 104 movls r0, #0 105 cmp ip, #0 106 vstm r9!, {d0-d15} 107 bne L30 108 L7 109 dsb 110 mov r0, r4 111 ldmfd sp!, {r4, r9, pc} 112 113 END 114 115
