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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/nexgen32e/memjmpinit.S Normal file
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/nexgen32e/x86feature.h"
#include "libc/macros.h"
.text.startup
/ Initializes jump table for memset() and memcpy().
/
/ @param !ZF if required cpu vector extensions are available
/ @param rdi is address of 64-bit jump table
/ @param rsi is address of 8-bit jump initializers
/ @param rdx is address of indirect branch
/ @param ecx is size of jump table
memjmpinit:
setnz %r8b
shl %r8b
0: xor %eax,%eax
lodsb
add %rdx,%rax
stosq
loop 0b
xor %eax,%eax
testb X86_HAVE(ERMS)+kCpuids(%rip)
setnz %al
or %r8b,%al
mov (%rsi,%rax),%al
add %rdx,%rax
stosq
lodsq
ret
.endfn memjmpinit,globl,hidden
.yoink __FILE__