Refactor some code

- Write tests for cthreads
- Fix bugs in pe2.com tool
- Fix ASAN issue with GetDosEnviron()
- Consolidate the cthread header files
- Some code size optimizations for MODE=
- Attempted to squash a tls linker warning
- Attempted to get futexes working on FreeBSD

libc/intrin/asan.c

@@ -753,7 +753,7 @@ dontdiscard static __asan_die_f *__asan_report(const void *addr, int size,
   p = __fatalbuf;
   kprintf("\n\e[J\e[1;31masan error\e[0m: %s %d-byte %s at %p shadow %p\n",
           __asan_describe_access_poison(kind), size, message, addr,
-          SHADOW(addr), __argv[0]);
+          SHADOW(addr));
   if (0 < size && size < 80) {
     base = (char *)addr - ((80 >> 1) - (size >> 1));
     for (i = 0; i < 80; ++i) {

libc/intrin/gettid.greg.c

@@ -58,7 +58,7 @@ privileged int gettid(void) {
   struct WinThread *wt;
 
   if (__tls_enabled) {
-    rc = *(int *)(__get_tls() + 0x38);
+    rc = *(int *)(__get_tls_inline() + 0x38);
     return rc;
   }
 

libc/intrin/isdebuggerpresent.c

@@ -21,23 +21,28 @@
 #include "libc/log/log.h"
 #include "libc/nexgen32e/vendor.internal.h"
 #include "libc/nt/struct/teb.h"
+#include "libc/runtime/runtime.h"
 #include "libc/sysv/consts/o.h"
 
 #define kBufSize 1024
 #define kPid     "TracerPid:\t"
 
+static textwindows noasan bool IsBeingDebugged(void) {
+  return !!NtGetPeb()->BeingDebugged;
+}
+
 /**
  * Determines if gdb, strace, windbg, etc. is controlling process.
  * @return non-zero if attached, otherwise 0
  */
-noasan noubsan int IsDebuggerPresent(bool force) {
+int IsDebuggerPresent(bool force) {
   /* asan runtime depends on this function */
   int fd, res;
   ssize_t got;
   char *p, buf[1024];
   if (!force && IsGenuineCosmo()) return 0;
-  if (!force && getenv("HEISENDEBUG")) return 0;
-  if (IsWindows()) return NtGetPeb()->BeingDebugged; /* needs noasan */
+  if (!force && __getenv(environ, "HEISENDEBUG")) return 0;
+  if (IsWindows()) return IsBeingDebugged();
   if (__isworker) return false;
   res = 0;
   if ((fd = __sysv_open("/proc/self/status", O_RDONLY, 0)) >= 0) {