[Qemu-devel] [Bug 696834] Re: FP exception reporting not working on NetBSD host

[Thomas Huth <696834@bugs.launchpad.net>]

Thanks for verifying!

** Changed in: qemu
       Status: Incomplete => Fix Released

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https://bugs.launchpad.net/bugs/696834

Title:
  FP exception reporting not working on NetBSD host

Status in QEMU:
  Fix Released

Bug description:
  I recognize that NetBSD is not one of the officially supported host
  OS.  However, qemu 0.13.0 is available in the NetBSD pkgsrc
  collection, and works quite well.  Well, with one exception (pun
  intended): It seems that Floating Point exceptions don't get reported
  properly.

  The following code-snippet demonstrates the problem:

  
  volatile int flt_signal = 0;

  static sigjmp_buf sigfpe_flt_env;
  static void
  sigfpe_flt_action(int signo, siginfo_t *info, void *ptr)
  {
          flt_signal++;
  }

  void trigger(void)
  {               
          struct sigaction sa;
          double d = strtod("0", NULL);
          
          if (sigsetjmp(sigfpe_flt_env, 0) == 0) {
                  sa.sa_flags = SA_SIGINFO;
                  sa.sa_sigaction = sigfpe_flt_action;
                  sigemptyset(&sa.sa_mask);
                  sigaction(SIGFPE, &sa, NULL);
                  fpsetmask(FP_X_INV|FP_X_DZ|FP_X_OFL|FP_X_UFL|FP_X_IMP);
                  printf("%g\n", 1 / d);
          }
          printf("FPE signal handler invoked %d times.\n");
  }

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