Merge pull request #22 from stffrdhrn/fpee-support

Add floating point exceptions support

Author: stffrdhrn

cpu-config.c

@@ -244,6 +244,7 @@ static void
 cpu_hardfloat (union param_val val, void *dat)
 {
   config.cpu.hardfloat = val.int_val;
+  cpu_state.sprs[SPR_CPUCFGR] |= SPR_CPUCFGR_OF32S;
 }
 /*---------------------------------------------------------------------------*/
 /*!Register the functions to handle a section cpu

cpu/or1k/except.c

@@ -99,6 +99,7 @@ except_handle (oraddr_t except, oraddr_t ea)
 	cpu_state.pc - (cpu_state.delay_insn ? 4 : 0);
       break;
       /* EPCR is loaded with address of next not-yet-executed instruction */
+    case EXCEPT_FPE:
     case EXCEPT_SYSCALL:
       cpu_state.sprs[SPR_EPCR_BASE] =
 	(cpu_state.pc + 4) - (cpu_state.delay_insn ? 4 : 0);

cpu/or32/execute.c

@@ -1113,12 +1113,10 @@ float_set_flags ()
 	 !!(float_exception_flags & float_flag_underflow),
 	 !!(float_exception_flags & float_flag_inexact));
   */
-  // TODO: Call FP exception is FPEE set and any of the flags were set
-  /*
-     if ((cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_FPEE) &
-     (|(cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_ALLF)))
-     except_handle (EXCEPT_FPE, cpu_state.iqueue.insn_addr);
-  */
+  // Call FP exception if FPEE set and any of the flags were set
+  if ((cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_FPEE) &&
+      (cpu_state.sprs[SPR_FPCSR] & SPR_FPCSR_ALLF))
+     except_handle (EXCEPT_FPE, cpu_state.sprs[SPR_EEAR_BASE]);
   // Now clear softfloat's flags:
   float_exception_flags = 0;