2020-06-15 14:18:57 +00:00
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/*-*- mode:asm; 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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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/ @asyncsignalsafe
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memmove:mov %rdi,%rax
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/ 𝑠𝑙𝑖𝑑𝑒
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_memmove:
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.leafprologue
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.profilable
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push %rcx
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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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pop %rcx
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.leafepilogue
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.endfn _memmove,globl,hidden
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.endfn memmove,globl
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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