RTEMS | Add another machine exception signal map test (!868)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion on testsuites/psxtests/psxsignal10/init.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/868#note_137027

 > +  rtems_test_assert( !status );
 > +  status = sigdelset( &all_masked, SIGILL );
 > +  rtems_test_assert( !status );
 > +
 > +  memset( &fault_act, 0, sizeof( fault_act ) );
 > +  fault_act.sa_handler = fault_handler;
 > +  fault_act.sa_mask = all_masked;
 > +
 > +  status = sigprocmask( SIG_SETMASK, &fault_act.sa_mask, &oset );
 > +  rtems_test_assert( !status );
 > +  status = sigaction( SIGILL, &fault_act, &fault_oact );
 > +  rtems_test_assert( !status );
 > +
 > +  if ( sigsetjmp( fault_jmp, 1 ) == 0 ) {
 > +    /* Generate machine exception */
 > +    _CPU_Instruction_illegal();

The test enablement is keyed on RTEMS_EXCEPTION_EXTENSIONS which should be adequate.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/868#note_137027
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