43 lines
2.3 KiB
ArmAsm
43 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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│ 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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.source __FILE__
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.testonly
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/ Empties L1 instruction cache.
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thrashcodecache:
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.leafprologue
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push %rbx
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xor %eax,%eax
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xor %ecx,%ecx
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cpuid
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/ pushpop 4,%rcx
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0: .rept 32768/(8+9)
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.byte 0x0f,0x1f,0x84,0,0,0,0,0 # fat nop x8
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.byte 0x66,0x0f,0x1f,0x84,0,0,0,0,0 # fat nop x9
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.endr
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/ loop 0b
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xor %eax,%eax
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xor %ecx,%ecx
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cpuid
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pop %rbx
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.leafepilogue
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.endfn thrashcodecache,globl
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