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Last change
on this file since 444 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
2.2 KB
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| 1 | /* |
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| 2 | * ==================================================== |
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| 3 | * Copyright (C) 2007 by Ellips BV. All rights reserved. |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this |
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| 6 | * software is freely granted, provided that this notice |
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| 7 | * is preserved. |
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| 8 | * ==================================================== |
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| 9 | */ |
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| 10 | |
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| 11 | #include "x86_64mach.h" |
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| 12 | |
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| 13 | .global SYM (memcpy) |
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| 14 | SOTYPE_FUNCTION(memcpy) |
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| 15 | |
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| 16 | SYM (memcpy): |
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| 17 | movq rdi, rax /* Store destination in return value */ |
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| 18 | cmpq $16, rdx |
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| 19 | jb byte_copy |
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| 20 | |
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| 21 | movq rdi, r8 /* Align destination on quad word boundary */ |
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| 22 | andq $7, r8 |
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| 23 | jz quadword_aligned |
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| 24 | movq $8, rcx |
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| 25 | subq r8, rcx |
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| 26 | subq rcx, rdx |
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| 27 | rep movsb |
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| 28 | |
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| 29 | quadword_aligned: |
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| 30 | cmpq $256, rdx |
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| 31 | jb quadword_copy |
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| 32 | |
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| 33 | pushq rax |
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| 34 | pushq r12 |
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| 35 | pushq r13 |
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| 36 | pushq r14 |
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| 37 | |
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| 38 | movq rdx, rcx /* Copy 128 bytes at a time with minimum cache polution */ |
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| 39 | shrq $7, rcx |
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| 40 | |
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| 41 | .p2align 4 |
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| 42 | loop: |
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| 43 | prefetchnta 768 (rsi) |
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| 44 | prefetchnta 832 (rsi) |
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| 45 | |
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| 46 | movq (rsi), rax |
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| 47 | movq 8 (rsi), r8 |
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| 48 | movq 16 (rsi), r9 |
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| 49 | movq 24 (rsi), r10 |
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| 50 | movq 32 (rsi), r11 |
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| 51 | movq 40 (rsi), r12 |
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| 52 | movq 48 (rsi), r13 |
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| 53 | movq 56 (rsi), r14 |
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| 54 | |
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| 55 | movntiq rax, (rdi) |
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| 56 | movntiq r8 , 8 (rdi) |
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| 57 | movntiq r9 , 16 (rdi) |
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| 58 | movntiq r10, 24 (rdi) |
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| 59 | movntiq r11, 32 (rdi) |
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| 60 | movntiq r12, 40 (rdi) |
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| 61 | movntiq r13, 48 (rdi) |
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| 62 | movntiq r14, 56 (rdi) |
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| 63 | |
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| 64 | movq 64 (rsi), rax |
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| 65 | movq 72 (rsi), r8 |
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| 66 | movq 80 (rsi), r9 |
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| 67 | movq 88 (rsi), r10 |
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| 68 | movq 96 (rsi), r11 |
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| 69 | movq 104 (rsi), r12 |
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| 70 | movq 112 (rsi), r13 |
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| 71 | movq 120 (rsi), r14 |
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| 72 | |
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| 73 | movntiq rax, 64 (rdi) |
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| 74 | movntiq r8 , 72 (rdi) |
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| 75 | movntiq r9 , 80 (rdi) |
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| 76 | movntiq r10, 88 (rdi) |
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| 77 | movntiq r11, 96 (rdi) |
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| 78 | movntiq r12, 104 (rdi) |
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| 79 | movntiq r13, 112 (rdi) |
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| 80 | movntiq r14, 120 (rdi) |
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| 81 | |
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| 82 | leaq 128 (rsi), rsi |
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| 83 | leaq 128 (rdi), rdi |
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| 84 | |
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| 85 | dec rcx |
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| 86 | jnz loop |
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| 87 | |
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| 88 | sfence |
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| 89 | movq rdx, rcx |
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| 90 | andq $127, rcx |
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| 91 | rep movsb |
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| 92 | popq r14 |
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| 93 | popq r13 |
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| 94 | popq r12 |
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| 95 | popq rax |
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| 96 | ret |
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| 97 | |
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| 98 | |
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| 99 | byte_copy: |
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| 100 | movq rdx, rcx |
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| 101 | rep movsb |
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| 102 | ret |
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| 103 | |
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| 104 | |
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| 105 | quadword_copy: |
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| 106 | movq rdx, rcx |
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| 107 | shrq $3, rcx |
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| 108 | .p2align 4 |
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| 109 | rep movsq |
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| 110 | movq rdx, rcx |
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| 111 | andq $7, rcx |
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| 112 | rep movsb /* Copy the remaining bytes */ |
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| 113 | ret |
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