Multithread gdbstub and execution, with cont/halt

src/cpu/rv32cpu.c

@@ -42,6 +42,7 @@ void cpu_init()
 {
 	cpu0 = calloc(1, sizeof(rv32_cpu_t));
 	pthread_mutex_init(&cpu0_mutex, 0);
+	pthread_cond_init(&cpu0->sim_condition, 0);
 	cpu0->regs.zero = 0;
 }
 
@@ -651,6 +652,9 @@ void cpu_loop(rv32_cpu_t* cpu)
 		pthread_mutex_lock(&cpu0_mutex);
 		pthread_mutex_lock(&memory_mutex);
 
+		while(!cpu->sim_ticks_left)
+			pthread_cond_wait(&cpu0->sim_condition, &cpu0_mutex);
+
 		// Fetch
 		raw_instruction_t raw_instruction;
 		if(cpu->pc > memory_size - 4)
@@ -675,6 +679,11 @@ void cpu_loop(rv32_cpu_t* cpu)
 
 		cpu->pc += 4;
 
+		// Update simulation data
+		cpu->sim_ticks_done++;
+		if(cpu->sim_ticks_left != (-1))
+			cpu->sim_ticks_left--;
+
 		// Let go of cpu and memory mutex
 		pthread_mutex_unlock(&cpu0_mutex);
 		pthread_mutex_unlock(&memory_mutex);

src/cpu/rv32cpu.h

@@ -3,6 +3,7 @@
 
 #include <stdint.h>
 #include <pthread.h>
+#include <stdlib.h>
 
 /*
 * This is a structure encoding for the registers of
@@ -184,8 +185,14 @@ typedef struct RV32_CPU_REGS
 
 typedef struct RV32_CPU
 {
+	// CPU values
     rv32_cpu_regs_t regs;
     uint32_t pc;
+
+	// Simulation data
+	ssize_t sim_ticks_left; // -1 : simulate forever
+	size_t sim_ticks_done;
+	pthread_cond_t sim_condition;
 } rv32_cpu_t;
 
 extern rv32_cpu_t* cpu0;