src/os/bsd/vm/vmError_bsd.cpp

rev 7905 : 8074552:  SafeFetch32 and SafeFetchN do not work in error handling
Summary: handle SafeFetch faults in secondary signal handlers
Contributed-by: Thomas Stuefe

*** 110,120 ****
    for (int i = 0; i < NUM_SIGNALS; i++) {
      sigaddset(&newset, SIGNALS[i]);
    }
    pthread_sigmask(SIG_UNBLOCK, &newset, NULL);
  
!   VMError err(NULL, sig, NULL, info, ucVoid);
    err.report_and_die();
  }
  
  void VMError::reset_signal_handlers() {
    // install signal handlers for all synchronous program error signals
--- 110,129 ----
    for (int i = 0; i < NUM_SIGNALS; i++) {
      sigaddset(&newset, SIGNALS[i]);
    }
    pthread_sigmask(SIG_UNBLOCK, &newset, NULL);
  
!   // support safefetch faults in error handling
!   ucontext_t* const uc = (ucontext_t*) ucVoid;
!   address const pc = uc ? os::Bsd::ucontext_get_pc(uc) : NULL;
! 
!   if (uc && pc && StubRoutines::is_safefetch_fault(pc)) {
!     os::Bsd::ucontext_set_pc(uc, StubRoutines::continuation_for_safefetch_fault(pc));
!     return;
!   }
! 
!   VMError err(NULL, sig, pc, info, ucVoid);
    err.report_and_die();
  }
  
  void VMError::reset_signal_handlers() {
    // install signal handlers for all synchronous program error signals