Change WFI behavior : halt simulation

src/cpu/rv32cpu.c

@@ -525,7 +525,8 @@ static void cpu_execute(rv32_cpu_t* cpu, instruction_t* instruction)
 									fprintf(stderr, "SFENCE.VMA: Guest kernel must think we have an MMU. We have none.\n");
 									break;
 								case FUNC7_WFI:
-									fprintf(stderr, "WFI: Guest kernel must think we have interrupts. We have none.\n");
+									fprintf(stderr, "WFI: Guest kernel must think we have interrupts. We have none. Halting simulation.\n");
+									cpu->sim_ticks_left = 1;
 									break;
 								default:
 									fprintf(stderr, "FATAL: Unknown IMM for ECALL/EBREAK instruction while executing (IMM=0x%x)\n", instruction->immediate);