Make improvements

This change progresses our AARCH64 support:

- The AARCH64 build and tests are now passing
- Add 128-bit floating-point support to printf()
- Fix clone() so it initializes cosmo's x28 TLS register
- Fix TLS memory layout issue with aarch64 _Alignas vars
- Revamp microbenchmarking tools so they work on aarch64
- Make some subtle improvements to aarch64 crash reporting
- Make kisdangerous() memory checks more accurate on aarch64
- Remove sys_open() since it's not available on Linux AARCH64

This change makes general improvements to Cosmo and Redbean:

- Introduce GetHostIsa() function in Redbean
- You can now feature check using pledge(0, 0)
- You can now feature check using unveil("",0)
- Refactor some more x86-specific asm comments
- Refactor and write docs for some libm functions
- Make the mmap() API behave more similar to Linux
- Fix WIFSIGNALED() which wrongly returned true for zero
- Rename some obscure cosmo keywords from noFOO to dontFOO

test/libc/runtime/arch_prctl_test.c

@@ -32,7 +32,7 @@
 #ifdef __x86_64__
 
 void SetUpOnce(void) {
-  __tls_enabled = false;
+  __tls_enabled_set(false);
   ASSERT_SYS(0, 0, pledge("stdio rpath", 0));
 }
 

test/libc/runtime/brk_test.c

@@ -1,96 +0,0 @@
-/*-*- 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 2022 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 "ape/sections.internal.h"
-#include "libc/calls/struct/rlimit.h"
-#include "libc/dce.h"
-#include "libc/errno.h"
-#include "libc/limits.h"
-#include "libc/runtime/runtime.h"
-#include "libc/sysv/consts/map.h"
-#include "libc/sysv/consts/prot.h"
-#include "libc/sysv/consts/rlimit.h"
-#include "libc/testlib/subprocess.h"
-#include "libc/testlib/testlib.h"
-
-void SetUp(void) {
-  if (IsWindows()) {
-    ASSERT_SYS(ENOSYS, -1, brk(0));
-    ASSERT_SYS(ENOSYS, MAP_FAILED, sbrk(0));
-    exit(0);
-  }
-}
-
-TEST(sbrk, testReportCurrentBreak) {
-  ASSERT_SYS(0, _end, sbrk(0));
-}
-
-TEST(sbrk, hugeDelta_returnsEoverflow) {
-  ASSERT_SYS(EOVERFLOW, MAP_FAILED, sbrk(INTPTR_MAX));
-}
-
-TEST(brk, underflowsEnd_returnsEinval) {
-  ASSERT_SYS(EINVAL, -1, brk(0));
-}
-
-TEST(sbrk, underflowsEnd_returnsEinval) {
-  ASSERT_SYS(EINVAL, MAP_FAILED, sbrk(-GUARDSIZE));
-}
-
-#ifndef __aarch64__
-// not sure if qemu-aarch64 supports this
-TEST(sbrk, giantDelta_returnsEnomem) {
-  if (IsXnu()) return;   // mmap polyfills this but brk doesn't right now
-  if (IsWsl1()) return;  // WSL1 setrlimit() is busted
-  SPAWN(fork);
-  struct rlimit rl = {1024 * 1024, 1024 * 1024};
-  ASSERT_SYS(0, 0, setrlimit(RLIMIT_AS, &rl));
-  ASSERT_SYS(ENOMEM, MAP_FAILED, sbrk(1024 * 1024 * 4));
-  EXITS(0);
-}
-#endif
-
-TEST(sbrk, overlapsExistingMapping_failsWithEexist) {
-  char *p = (char *)ROUNDUP((intptr_t)_end, FRAMESIZE);
-  ASSERT_EQ(p, mmap(p, FRAMESIZE, PROT_READ | PROT_WRITE,
-                    MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, -1, 0));
-  ASSERT_SYS(EEXIST, MAP_FAILED, sbrk(FRAMESIZE));
-  ASSERT_SYS(0, 0, munmap(p, FRAMESIZE));
-}
-
-TEST(sbrk, testGrowAndShrink) {
-  SPAWN(fork);
-  ASSERT_FALSE(testlib_memoryexists(_end));
-  ASSERT_SYS(0, _end, sbrk(GUARDSIZE));
-  ASSERT_SYS(0, _end + GUARDSIZE, sbrk(0));
-  ASSERT_TRUE(testlib_memoryexists(_end));
-  ASSERT_FALSE(testlib_memoryexists(_end + GUARDSIZE));
-  ASSERT_SYS(0, _end + GUARDSIZE, sbrk(-GUARDSIZE));
-  ASSERT_FALSE(testlib_memoryexists(_end));
-  EXITS(0);
-}
-
-TEST(brk, testGrowAndShrink) {
-  SPAWN(fork);
-  ASSERT_FALSE(testlib_memoryexists(_end));
-  ASSERT_EQ(0, brk(_end + GUARDSIZE));
-  ASSERT_TRUE(testlib_memoryexists(_end));
-  ASSERT_FALSE(testlib_memoryexists(_end + GUARDSIZE));
-  ASSERT_EQ(0, brk(_end));
-  EXITS(0);
-}