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b1ff428c | 1 | #\r |
2 | # ConvertAsm.py: Automatically generated from CopyMem.asm\r | |
3 | #\r | |
4 | #------------------------------------------------------------------------------\r | |
5 | #\r | |
1fef058f | 6 | # Copyright (c) 2006 - 2009, Intel Corporation\r |
b1ff428c | 7 | # All rights reserved. This program and the accompanying materials\r |
8 | # are licensed and made available under the terms and conditions of the BSD License\r | |
9 | # which accompanies this distribution. The full text of the license may be found at\r | |
10 | # http://opensource.org/licenses/bsd-license.php\r | |
11 | #\r | |
12 | # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
13 | # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | #\r | |
15 | # Module Name:\r | |
16 | #\r | |
17 | # CopyMem.S\r | |
18 | #\r | |
19 | # Abstract:\r | |
20 | #\r | |
21 | # CopyMem function\r | |
22 | #\r | |
23 | # Notes:\r | |
24 | #\r | |
25 | #------------------------------------------------------------------------------\r | |
26 | \r | |
27 | \r | |
28 | #------------------------------------------------------------------------------\r | |
29 | # VOID *\r | |
30 | # EFIAPI\r | |
31 | # InternalMemCopyMem (\r | |
32 | # IN VOID *Destination,\r | |
33 | # IN VOID *Source,\r | |
34 | # IN UINTN Count\r | |
35 | # )\r | |
36 | #------------------------------------------------------------------------------\r | |
132f41f0 | 37 | ASM_GLOBAL ASM_PFX(InternalMemCopyMem)\r |
b1ff428c | 38 | ASM_PFX(InternalMemCopyMem):\r |
1fef058f | 39 | pushq %rsi\r |
40 | pushq %rdi\r | |
41 | movq %rdx, %rsi # rsi <- Source\r | |
42 | movq %rcx, %rdi # rdi <- Destination\r | |
43 | leaq -1(%rsi, %r8,), %r9 # r9 <- Last byte of Source\r | |
44 | cmpq %rdi, %rsi\r | |
45 | movq %rdi, %rax # rax <- Destination as return value\r | |
b1ff428c | 46 | jae L0 # Copy forward if Source > Destination\r |
1fef058f | 47 | cmpq %rdi, %r9 # Overlapped?\r |
b1ff428c | 48 | jae L_CopyBackward # Copy backward if overlapped\r |
49 | L0: \r | |
1fef058f | 50 | xorq %rcx, %rcx \r |
51 | subq %rdi, %rcx # rcx <- -rdi\r | |
52 | andq $15, %rcx # rcx + rsi should be 16 bytes aligned\r | |
b1ff428c | 53 | jz L1 # skip if rcx == 0\r |
1fef058f | 54 | cmpq %r8, %rcx\r |
55 | cmova %r8, %rcx\r | |
56 | subq %rcx, %r8\r | |
b1ff428c | 57 | rep movsb\r |
58 | L1:\r | |
1fef058f | 59 | movq %r8, %rcx\r |
60 | andq $15, %r8\r | |
61 | shrq $4, %rcx # rcx <- # of DQwords to copy\r | |
b1ff428c | 62 | jz L_CopyBytes\r |
1fef058f | 63 | movdqa %xmm0, 0x18(%rsp) # save xmm0 on stack\r |
b1ff428c | 64 | L2:\r |
1fef058f | 65 | movdqu (%rsi), %xmm0 # rsi may not be 16-byte aligned\r |
66 | movntdq %xmm0, (%rdi) # rdi should be 16-byte aligned\r | |
67 | addq $16, %rsi\r | |
68 | addq $16, %rdi\r | |
b1ff428c | 69 | loop L2\r |
70 | mfence\r | |
1fef058f | 71 | movdqa 0x18(%rsp), %xmm0 # restore xmm0\r |
b1ff428c | 72 | jmp L_CopyBytes # copy remaining bytes\r |
73 | L_CopyBackward:\r | |
1fef058f | 74 | movq %r9, %rsi # rsi <- Last byte of Source\r |
75 | leaq -1(%rdi, %r8,), %rdi # rdi <- Last byte of Destination\r | |
b1ff428c | 76 | std\r |
77 | L_CopyBytes:\r | |
1fef058f | 78 | movq %r8, %rcx\r |
b1ff428c | 79 | rep movsb\r |
80 | cld\r | |
1fef058f | 81 | popq %rdi\r |
82 | popq %rsi\r | |
b1ff428c | 83 | ret\r |