src/asm.hpp


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#ifndef SRC_ASM_HPP_
#define SRC_ASM_HPP_

#include <cstdint>

enum class type_t {R, I, S, U, B, J};

struct r_type {
    uint32_t funct7 : 7;
    uint32_t rs2    : 5;
    uint32_t rs1    : 5;
    uint32_t funct3 : 3;
    uint32_t rd     : 5;
    uint32_t opcode : 7;
};

struct i_type {
    uint32_t imm    : 12;
    uint32_t rs1    : 5;
    uint32_t funct3 : 3;
    uint32_t rd     : 5;
    uint32_t opcode : 7;
};

struct s_type {
    uint32_t imm_hi : 7;
    uint32_t rs2    : 5;
    uint32_t rs1    : 5;
    uint32_t funct3 : 3;
    uint32_t imm_lo : 5;
    uint32_t opcode : 7;
};

struct u_type {
    uint32_t imm    : 10;
    uint32_t rd     : 5;
    uint32_t opcode : 7;
};

struct b_type {
    uint32_t a      : 1;
    uint32_t imm_hi : 6;
    uint32_t rs2    : 5;
    uint32_t rs1    : 5;
    uint32_t funct3 : 3;
    uint32_t imm_lo : 4;
    uint32_t b      : 1;
    uint32_t opcode : 7;
};

struct j_type {
    uint32_t a      : 1;
    uint32_t imm_lo : 10;
    uint32_t b      : 1;
    uint32_t imm_hi : 8;
    uint32_t rd     : 5;
    uint32_t opcode : 7;
};

struct instruction_t {
    type_t t;
    union {
        r_type   r;
        i_type   i;
        s_type   s;
        u_type   u;
        b_type   b;
        j_type   j;
        uint32_t value;
    };
};

#endif  // SRC_ASM_HPP_