Make improvements

- Emulator can now test the αcτµαlly pδrταblε εxεcµταblε bootloader

- Whipped up a webserver named redbean. It services 150k requests per
  second on a single core. Bundling assets inside zip enables extremely
  fast serving for two reasons. The first is that zip central directory
  lookups go faster than stat() system calls. The second is that both
  zip and gzip content-encoding use DEFLATE, therefore, compressed
  responses can be served via the sendfile() system call which does an
  in-kernel copy directly from the zip executable structure. Also note
  that red bean zip executables can be deployed easily to all platforms,
  since these native executables work on Linux, Mac, BSD, and Windows.

- Address sanitizer now works very well

libc/runtime/destruct.S

@@ -0,0 +1,45 @@
+/*-*- mode:unix-assembly; 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"
+.text.exit
+.source	__FILE__
+
+/	Calls linker registered finalization functions.
+/	@note	functions are called in reverse order
+_destruct:
+	push	%rbp
+	mov	%rsp,%rbp
+	ezlea	__fini_array_start,cx
+	.weak	__fini_array_start
+	ezlea	__fini_array_end,ax
+	.weak	__fini_array_end
+	cmp	%rax,%rcx
+	je	2f
+1:	sub	$8,%rax
+	push	%rax
+	push	%rcx
+	call	*(%rax)
+	pop	%rcx
+	pop	%rax
+	cmp	%rax,%rcx
+	jne	1b
+2:	pop	%rbp
+	ret
+	.endfn	_destruct,globl

libc/runtime/exit.S

@@ -31,6 +31,7 @@ exit:	push	%rbp
 	push	%rdi
 	xor	%edi,%edi
 	call	__cxa_finalize
+	call	_destruct
 	pop	%rdi
 	pop	%rdi
 	call	_Exit

libc/runtime/missioncritical.h

@@ -136,7 +136,8 @@
     }                                                                         \
   while (0)
 
-interruptfn void __print(const void *, size_t);
+void __print(const void *, size_t);
+void __print_string(const char *);
 
 #define LOAD_DEFAULT_RBX() /* disabled for now b/c clang */
 #define RESTORE_RBX()      /* disabled for now b/c clang */

libc/runtime/print.greg.c

@@ -49,9 +49,8 @@ static privileged void __print$nt(const void *data, size_t len) {
  * @clob nothing except flags
  * @see PRINT()
  */
-privileged interruptfn void __print(const void *data, size_t len) {
+privileged void __print(const void *data, size_t len) {
   int64_t ax, ordinal;
-  LOAD_DEFAULT_RBX();
   if (NT_HAVE_IMPORT(__imp_WriteFile)) {
     __print$nt(data, len);
   } else {
@@ -69,3 +68,9 @@ privileged interruptfn void __print(const void *data, size_t len) {
   }
   RESTORE_RBX();
 }
+
+privileged void __print_string(const char *s) {
+  size_t n = 0;
+  while (s[n]) ++n;
+  __print(s, n);
+}