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 #------------------------------------------------------------------------------ 29 # VOID * 30 # EFIAPI 31 # InternalMemCopyMem ( 32 # IN VOID *Destination, 33 # IN VOID *Source, 34 # IN UINTN Count 35 # ) 36 #------------------------------------------------------------------------------ 37 ASM_GLOBAL ASM_PFX(InternalMemCopyMem) 38 ASM_PFX(InternalMemCopyMem): 39 pushq %rsi 40 pushq %rdi 41 movq %rdx, %rsi # rsi <- Source 42 movq %rcx, %rdi # rdi <- Destination 43 leaq -1(%rsi, %r8,), %r9 # r9 <- Last byte of Source 44 cmpq %rdi, %rsi 45 movq %rdi, %rax # rax <- Destination as return value 46 jae L0 # Copy forward if Source > Destination 47 cmpq %rdi, %r9 # Overlapped? 48 jae L_CopyBackward # Copy backward if overlapped 49 L0: 50 xorq %rcx, %rcx 51 subq %rdi, %rcx # rcx <- -rdi 52 andq $15, %rcx # rcx + rsi should be 16 bytes aligned 53 jz L1 # skip if rcx == 0 54 cmpq %r8, %rcx 55 cmova %r8, %rcx 56 subq %rcx, %r8 57 rep movsb 58 L1: 59 movq %r8, %rcx 60 andq $15, %r8 61 shrq $4, %rcx # rcx <- # of DQwords to copy 62 jz L_CopyBytes 63 movdqa %xmm0, 0x18(%rsp) # save xmm0 on stack 64 L2: 65 movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned 66 movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned 67 addq $16, %rsi 68 addq $16, %rdi 69 loop L2 70 mfence 71 movdqa 0x18(%rsp), %xmm0 # restore xmm0 72 jmp L_CopyBytes # copy remaining bytes 73 L_CopyBackward: 74 movq %r9, %rsi # rsi <- Last byte of Source 75 leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination 76 std 77 L_CopyBytes: 78 movq %r8, %rcx 79 rep movsb 80 cld 81 popq %rdi 82 popq %rsi 83 ret 84
