diff --git a/libc/loader/linux/aarch64/CMakeLists.txt b/libc/loader/linux/aarch64/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/libc/loader/linux/aarch64/CMakeLists.txt
@@ -0,0 +1,13 @@
+add_loader_object(
+  crt1
+  SRC
+    start.cpp
+  DEPENDS
+    libc.config.linux.app_h
+    libc.include.sys_syscall
+    libc.src.__support.OSUtil.osutil
+    libc.src.string.memcpy
+  COMPILE_OPTIONS
+    -fno-omit-frame-pointer
+    -ffreestanding # To avoid compiler warnings about calling the main function.
+)
diff --git a/libc/loader/linux/aarch64/start.cpp b/libc/loader/linux/aarch64/start.cpp
new file mode 100644
--- /dev/null
+++ b/libc/loader/linux/aarch64/start.cpp
@@ -0,0 +1,83 @@
+//===-- Implementation of crt for aarch64 ---------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "config/linux/app.h"
+#include "include/sys/syscall.h"
+#include "src/__support/OSUtil/syscall.h"
+
+#include <linux/auxvec.h>
+#include <linux/elf.h>
+#include <stdint.h>
+
+extern "C" int main(int, char **, char **);
+
+// Source documentation:
+// https://github.com/ARM-software/abi-aa/tree/main/sysvabi64
+
+namespace __llvm_libc {
+
+AppProperties app;
+
+} // namespace __llvm_libc
+
+using __llvm_libc::app;
+
+struct Args {
+  // In the ARM64 ABI, arguments are usually passed in registers.  x0 is a
+  // doubleword register, so this is 64 bit.
+  uint64_t argc;
+
+  // C++ Doesn't have flexible arrays: P1039 proposes to fix this, but for now
+  // we just fake it.  Even if argc is zero, "argv[argc] shall be a null
+  // pointer" (ISO C 5.1.2.2.1) so one is fine.
+  uint64_t argv[1];
+};
+
+// TODO: Would be nice to use the aux entry structure from elf.h when available.
+struct AuxEntry {
+  uint64_t type;
+  uint64_t value;
+};
+
+extern "C" void _start() {
+  uintptr_t *frame_ptr =
+      reinterpret_cast<uintptr_t *>(__builtin_frame_address(0));
+
+  // Skip the Frame Pointer and the Link Register
+  // https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst
+  // Section 6.2.3
+
+  Args *args = reinterpret_cast<Args *>(frame_ptr + 2);
+
+  // After the argv array, is a 8-byte long NULL value before the array of env
+  // values. The end of the env values is marked by another 8-byte long NULL
+  // value. We step over it (the "+ 1" below) to get to the env values.
+  uint64_t *env_ptr = args->argv + args->argc + 1;
+  uint64_t *env_end_marker = env_ptr;
+  while (*env_end_marker)
+    ++env_end_marker;
+
+  // After the env array, is the aux-vector. The end of the aux-vector is
+  // denoted by an AT_NULL entry.
+  for (AuxEntry *aux_entry = reinterpret_cast<AuxEntry *>(env_end_marker + 1);
+       aux_entry->type != AT_NULL; ++aux_entry) {
+    switch (aux_entry->type) {
+    case AT_PAGESZ:
+      app.pageSize = aux_entry->value;
+      break;
+    default:
+      break; // TODO: Read other useful entries from the aux vector.
+    }
+  }
+
+  // TODO: Init TLS
+
+  __llvm_libc::syscall(SYS_exit,
+                       main(args->argc, reinterpret_cast<char **>(args->argv),
+                            reinterpret_cast<char **>(env_ptr)));
+}