51 lines
2.5 KiB
ArmAsm
51 lines
2.5 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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│ 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/nexgen32e/x86feature.h"
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#include "libc/macros.h"
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.text.startup
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/ Initializes jump table for memset() and memcpy().
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/
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/ @param !ZF if required cpu vector extensions are available
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/ @param rdi is address of 64-bit jump table
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/ @param rsi is address of 8-bit jump initializers
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/ @param rdx is address of indirect branch
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/ @param ecx is size of jump table
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memjmpinit:
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.leafprologue
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setnz %r8b
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shl %r8b
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0: xor %eax,%eax
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lodsb
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add %rdx,%rax
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stosq
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loop 0b
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xor %eax,%eax
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testb X86_HAVE(ERMS)+kCpuids(%rip)
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setnz %al
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or %r8b,%al
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mov (%rsi,%rax),%al
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add %rdx,%rax
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stosq
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lodsq
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.leafepilogue
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.endfn memjmpinit,globl,hidden
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.source __FILE__
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