54 lines
2.3 KiB
ArmAsm
54 lines
2.3 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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/ Copies memory.
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/
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/ DEST and SRC may overlap.
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/
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/ @param rdi is dest
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/ @param rsi is src
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/ @param rdx is number of bytes
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/ @return original rdi copied to rax
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/ @clob flags,rcx
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/ @asyncsignalsafe
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memmove:
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mov %rdi,%rax
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/ 𝑠𝑙𝑖𝑑𝑒
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.endfn MemMove,globl,hidden
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MemMove:
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.leafprologue
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.profilable
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push %rdi
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push %rsi
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mov %rdx,%rcx
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cmp %rsi,%rdi
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jb 1f
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lea -1(%rdi,%rcx),%rdi
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lea -1(%rsi,%rcx),%rsi
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std
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1: rep movsb
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cld
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pop %rsi
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pop %rdi
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.leafepilogue
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.endfn memmove,globl
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.source __FILE__
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