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40 lines
2.5 KiB
ArmAsm
40 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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│ 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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#include "libc/notice.inc"
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.source __FILE__
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// Allocates aligned memory.
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//
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// Returns a pointer to a newly allocated chunk of n bytes, aligned in
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// accord with the alignment argument. The alignment argument should be
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// a power of two. If the argument is not a power of two, the nearest
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// greater power is used. 8-byte alignment is guaranteed by normal
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// malloc calls, so don't bother calling memalign with an argument of 8
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// or less.
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//
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// @param rdi is alignment in bytes
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// @param rsi (newsize) is number of bytes needed
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// @return rax is memory address, or NULL w/ errno
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// @note overreliance on memalign is a sure way to fragment space
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// @see dlmemalign()
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memalign:
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jmp *hook_memalign(%rip)
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.endfn memalign,globl
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