Get LIBC_MEM and LIBC_STDIO building with aarch64

libc/mem/malloc.c

@@ -0,0 +1,45 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/mem/hook.internal.h"
+#include "libc/mem/mem.h"
+#include "third_party/dlmalloc/dlmalloc.h"
+
+void *(*hook_malloc)(size_t) = dlmalloc;
+
+/**
+ * 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, coerced to 1+
+ * @return new memory, or NULL w/ errno
+ * @threadsafe
+ */
+void *malloc(size_t n) {
+  return hook_malloc(n);
+}