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

[Thomas Huth]

QEMU 0.13 is completely outdated nowadays - can you still reproduce this
problem with the latest version of QEMU (currently version 2.8) ?

** Changed in: qemu
       Status: New => Incomplete

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/696834

Title:
  FP exception reporting not working on NetBSD host

Status in QEMU:
  Incomplete

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");
  }

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/696834/+subscriptions