Make improvements

- Fix build flakes
- Polyfill SIGWINCH on Windows
- Fix an execve issue on Windows
- Make strerror show more information
- Improve cmd.exe setup/teardown on Windows
- Support bracketed paste mode in Blinkenlights
- Show keyboard shortcuts in Blinkenlights status bar
- Fixed copy_file_range() and copyfile() w/ zip filesystem
- Size optimize GetDosArgv() to keep life.com 12kb in size
- Improve Blinkenlights ability to load weird ELF executables
- Fix program_executable_name and add GetInterpreterExecutableName
- Make Python in tiny mode fail better if docstrings are requested
- Update Python test exclusions in tiny* modes such as tinylinux
- Add bulletproof unbreakable kprintf() troubleshooting function
- Remove "oldskool" keyword from ape.S for virus scanners
- Fix issue that caused backtraces to not print sometimes
- Improve Blinkenlights serial uart character i/o
- Make clock_gettime() not clobber errno on xnu
- Improve sha256 cpuid check for old computers
- Integrate some bestline linenoise fixes
- Show runit process names better in htop
- Remove SIGPIPE from ShowCrashReports()
- Make realpath() not clobber errno
- Avoid attaching GDB on non-Linux
- Improve img.com example

tool/build/lib/machine.c

@@ -288,6 +288,12 @@ static void OpJmpf(struct Machine *m, uint32_t rde) {
   }
 }
 
+static void OpInto(struct Machine *m, uint32_t rde) {
+  if (GetFlag(m->flags, FLAGS_OF)) {
+    HaltMachine(m, kMachineOverflow);
+  }
+}
+
 static relegated void OpXlatAlBbb(struct Machine *m, uint32_t rde) {
   uint64_t v;
   v = MaskAddress(Eamode(rde), Read64(m->bx) + Read8(m->ax));
@@ -1888,7 +1894,7 @@ static const nexgen32e_f kNexgen32e[] = {
     [0x0CB] = OpRetf,
     [0x0CC] = OpInterrupt3,
     [0x0CD] = OpInterruptImm,
-    [0x0CE] = OpUd,
+    [0x0CE] = OpInto,
     [0x0CF] = OpUd,
     [0x0D0] = OpBsubi1,
     [0x0D1] = OpBsuwi1,