1 # 2 # ConvertAsm.py: Automatically generated from CopyMem.asm 3 # 4 #------------------------------------------------------------------------------ 5 # 6 # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR> 7 # This program and the accompanying materials 8 # are licensed and made available under the terms and conditions of the BSD License 9 # which accompanies this distribution. The full text of the license may be found at 10 # http://opensource.org/licenses/bsd-license.php. 11 # 12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 # 15 # Module Name: 16 # 17 # CopyMem.S 18 # 19 # Abstract: 20 # 21 # CopyMem function 22 # 23 # Notes: 24 # 25 #------------------------------------------------------------------------------ 26 27 #------------------------------------------------------------------------------ 28 # VOID * 29 # EFIAPI 30 # InternalMemCopyMem ( 31 # IN VOID *Destination, 32 # IN VOID *Source, 33 # IN UINTN Count 34 # ) 35 #------------------------------------------------------------------------------ 36 ASM_GLOBAL ASM_PFX(InternalMemCopyMem) 37 ASM_PFX(InternalMemCopyMem): 38 pushq %rsi 39 pushq %rdi 40 movq %rdx, %rsi # rsi <- Source 41 movq %rcx, %rdi # rdi <- Destination 42 leaq -1(%rsi,%r8,), %r9 # r9 <- Last byte of Source 43 cmpq %rdi, %rsi 44 movq %rdi, %rax # rax <- Destination as return value 45 jae L0 # Copy forward if Source > Destination 46 cmpq %rdi, %r9 # Overlapped? 47 jae L_CopyBackward # Copy backward if overlapped 48 L0: 49 xorq %rcx, %rcx 50 subq %rdi, %rcx # rcx <- -rdi 51 andq $15, %rcx # rcx + rsi should be 16 bytes aligned 52 jz L1 # skip if rcx == 0 53 cmpq %r8, %rcx 54 cmova %r8, %rcx 55 subq %rcx, %r8 56 rep movsb 57 L1: 58 movq %r8, %rcx 59 andq $15, %r8 60 shrq $4, %rcx # rcx <- # of DQwords to copy 61 jz L_CopyBytes 62 movdqu %xmm0, 0x18(%rsp) # save xmm0 on stack 63 L2: 64 movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned 65 movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned 66 addq $16, %rsi 67 addq $16, %rdi 68 loop L2 69 mfence 70 movdqa 0x18(%rsp), %xmm0 # restore xmm0 71 jmp L_CopyBytes # copy remaining bytes 72 L_CopyBackward: 73 movq %r9, %rsi # rsi <- Last byte of Source 74 leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination 75 std 76 L_CopyBytes: 77 movq %r8, %rcx 78 rep movsb 79 cld 80 popq %rdi 81 popq %rsi 82 ret 83
