vriscv/src/cpu/rv32cpu.h

#ifndef RV32CPU_H
#define RV32CPU_H

#include <stdint.h>

/*
* This is a structure encoding for the registers of
* the rv32 cpu.
* It allows access of register x0 using :
* structname.x0, structname.zero, structname.x[0]
* This way, access can be really flexible
*/
typedef struct RV32_CPU_REGS
{
	union
	{
		struct
		{
			union
			{
				uint32_t x0;
				uint32_t zero;
			};
			union
			{
				uint32_t x1;
				uint32_t ra;
			};
			union
			{
				uint32_t x2;
				uint32_t sp;
			};
			union
			{
				uint32_t x3;
				uint32_t gp;
			};
			union
			{
				uint32_t x4;
				uint32_t tp;
			};
			union
			{
				uint32_t x5;
				uint32_t t0;
			};
			union
			{
				uint32_t x6;
				uint32_t t1;
			};
			union
			{
				uint32_t x7;
				uint32_t t2;
			};
			union
			{
				uint32_t x8;
				uint32_t s0;
			};
			union
			{
				uint32_t x9;
				uint32_t s1;
			};
			union
			{
				uint32_t x10;
				uint32_t a0;
			};
			union
			{
				uint32_t x11;
				uint32_t a1;
			};
			union
			{
				uint32_t x12;
				uint32_t a2;
			};
			union
			{
				uint32_t x13;
				uint32_t a3;
			};
			union
			{
				uint32_t x14;
				uint32_t a4;
			};
			union
			{
				uint32_t x15;
				uint32_t a5;
			};
			union
			{
				uint32_t x16;
				uint32_t a6;
			};
			union
			{
				uint32_t x17;
				uint32_t a7;
			};
			union
			{
				uint32_t x18;
				uint32_t s2;
			};
			union
			{
				uint32_t x19;
				uint32_t s3;
			};
			union
			{
				uint32_t x20;
				uint32_t s4;
			};
			union
			{
				uint32_t x21;
				uint32_t s5;
			};
			union
			{
				uint32_t x22;
				uint32_t s6;
			};
			union
			{
				uint32_t x23;
				uint32_t s7;
			};
			union
			{
				uint32_t x24;
				uint32_t s8;
			};
			union
			{
				uint32_t x25;
				uint32_t s9;
			};
			union
			{
				uint32_t x26;
				uint32_t s10;
			};
			union
			{
				uint32_t x27;
				uint32_t s11;
			};
			union
			{
				uint32_t x28;
				uint32_t t3;
			};
			union
			{
				uint32_t x29;
				uint32_t t4;
			};
			union
			{
				uint32_t x30;
				uint32_t t5;
			};
			union
			{
				uint32_t x31;
				uint32_t t6;
			};
		};
		uint32_t x[32];
	};
} rv32_cpu_regs_t;

typedef struct RV32_CPU
{
    rv32_cpu_regs_t regs;
    uint32_t pc;
} rv32_cpu_t;

extern rv32_cpu_t* cpu0;
void cpu_init();
void cpu_loop(rv32_cpu_t* cpu);

#endif