2022-05-17 14:40:00 +00:00
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/*-*- 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 2022 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.internal.h"
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// Checks that stack is 16-byte aligned.
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//
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// This function crashes if called with a misaligned stack.
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2022-05-19 23:57:49 +00:00
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CheckStackIsAligned:
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2022-05-17 14:40:00 +00:00
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push %rbp
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mov %rsp,%rbp
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2022-05-27 06:17:19 +00:00
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// allocate sixteen bytes
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2022-05-17 14:40:00 +00:00
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push %rax
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push %rax
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2022-05-27 06:17:19 +00:00
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// put a value in it
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2022-05-17 14:40:00 +00:00
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xorps %xmm0,%xmm0
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movaps %xmm0,-16(%rbp)
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leave
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ret
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2022-05-19 23:57:49 +00:00
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.endfn CheckStackIsAligned,globl
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