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Justine Tunney 2020-06-15 07:18:57 -07:00
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libc/mem/malloc.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/macros.h"
.yoink __FILE__
/ Allocates uninitialized memory.
/
/ Returns a pointer to a newly allocated chunk of at least n bytes, or
/ null if no space is available, in which case errno is set to ENOMEM
/ on ANSI C systems.
/
/ If n is zero, malloc returns a minimum-sized chunk. (The minimum size
/ is 32 bytes on 64bit systems.) Note that size_t is an unsigned type,
/ so calls with arguments that would be negative if signed are
/ interpreted as requests for huge amounts of space, which will often
/ fail. The maximum supported value of n differs across systems, but is
/ in all cases less than the maximum representable value of a size_t.
/
/ @param rdi is number of bytes needed
/ @return new memory, or NULL w/ errno
/ @note malloc(0) → malloc(32)
/ @see dlmalloc()
malloc: jmp *hook$malloc(%rip)
.endfn malloc,globl