328 lines
12 KiB
C
328 lines
12 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define PARSE_I_INS(ins) \
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uint8_t rd = (ins >> 7) & 0b11111; \
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uint8_t funct3 = (ins >> 12) & 0b111; \
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uint8_t rs1 = (ins >> 15) & 0b11111; \
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int32_t imm = ((int32_t)ins) >> 20
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#define PARSE_R_INS(ins) \
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uint8_t rd = (ins >> 7) & 0b11111; \
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uint8_t funct3 = (ins >> 12) & 0b111; \
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uint8_t rs1 = (ins >> 15) & 0b11111; \
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uint8_t rs2 = (ins >> 20) & 0b11111; \
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int32_t funct7 = ((int32_t)ins) >> 25
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#define PARSE_B_INS(ins) \
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uint8_t funct3 = (ins >> 12) & 0b111; \
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uint8_t rs1 = (ins >> 15) & 0b11111; \
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uint8_t rs2 = (ins >> 20) & 0b11111; \
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int32_t imm_12 = (ins >> 31) & 0b1; \
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int32_t imm_10_5 = (ins >> 25) & 0b111111; \
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int32_t imm_4_1 = (ins >> 8) & 0b1111; \
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int32_t imm_11 = (ins >> 7) & 0b1; \
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int32_t imm = \
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(imm_12 << 12) | (imm_11 << 11) | (imm_10_5 << 5) | (imm_4_1 << 1); \
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imm = (imm << 19) >> 19
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#define PARSE_S_INS(ins) \
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uint8_t funct3 = (ins >> 12) & 0b111; \
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uint8_t rs1 = (ins >> 15) & 0b11111; \
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uint8_t rs2 = (ins >> 20) & 0b11111; \
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int32_t imm_11_5 = (ins >> 25) & 0b1111111; \
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int32_t imm_4_0 = (ins >> 7) & 0b11111; \
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int32_t imm = (imm_11_5 << 5) | imm_4_0; \
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imm = (imm << 20) >> 20
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#define PARSE_J_INS(ins) \
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uint8_t rd = (ins >> 7) & 0b11111; \
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int32_t imm_20 = (ins >> 31) & 0b1; \
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int32_t imm_10_1 = (ins >> 21) & 0b1111111111; \
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int32_t imm_11 = (ins >> 20) & 0b1; \
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int32_t imm_19_12 = (ins >> 12) & 0b11111111; \
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int32_t imm = \
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(imm_20 << 20) | (imm_19_12 << 12) | (imm_11 << 11) | (imm_10_1 << 1); \
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imm = (imm << 11) >> 11
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#define PARSE_U_INS(ins) \
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uint8_t rd = (ins >> 7) & 0b11111; \
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int32_t imm = ins >> 12
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typedef struct {
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size_t offset;
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size_t size;
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size_t entrypoint;
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} Section;
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typedef struct {
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uint8_t *memory;
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size_t pc;
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int64_t regs[32];
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Section code_section;
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} RISCV64;
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extern const char *const REGS[32];
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void riscv64_disassemble_one(const RISCV64 *r) { // NOLINT
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uint32_t ins;
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memcpy(&ins, r->memory + r->pc, 4);
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uint16_t opcode = ins & 0b1111111;
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// https://stackoverflow.com/questions/62939410/how-can-i-find-out-the-instruction-format-of-a-risc-v-instruction
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switch (opcode) {
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case 0b1100011: {
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PARSE_B_INS(ins);
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if (funct3 == 0b000) {
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printf("beq %s, %s, %d\n", REGS[rs1], REGS[rs2], imm);
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} else if (funct3 == 0b001) {
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printf("bne %s, %s, %d\n", REGS[rs1], REGS[rs2], imm);
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} else if (funct3 == 0b100) {
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printf("blt %s, %s, %d\n", REGS[rs1], REGS[rs2], imm);
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} else if (funct3 == 0b101) {
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printf("bge %s, %s, %d\n", REGS[rs1], REGS[rs2], imm);
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} else if (funct3 == 0b110) {
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printf("bltu %s, %s, %d\n", REGS[rs1], REGS[rs2], imm);
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} else {
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fprintf(stderr, "B-type: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0010011: {
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PARSE_I_INS(ins);
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if (funct3 == 0b000) {
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printf("addi %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else if (funct3 == 0b001) {
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uint32_t shamt = (ins >> 20) & 0b111111;
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uint32_t funct6 = (ins >> 26) & 0b111111;
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if (funct6 == 0b000000) {
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printf("slli %s, %s, %d\n", REGS[rd], REGS[rs1], shamt);
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} else {
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fprintf(stderr, "I-type 1: funct3=001: unrecognized funct6: %b\n",
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funct6);
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exit(1);
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}
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} else if (funct3 == 0b011) {
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printf("sltiu %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else if (funct3 == 0b100) {
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printf("xori %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else if (funct3 == 0b101) {
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// of course this one just has to be different
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uint32_t shamt = (ins >> 20) & 0b111111;
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uint32_t funct6 = (ins >> 26) & 0b111111;
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if (funct6 == 0b000000) {
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printf("srli %s, %s, %d\n", REGS[rd], REGS[rs1], shamt);
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} else if (funct6 == 0b010000) {
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printf("srai %s, %s, %d\n", REGS[rd], REGS[rs1], shamt);
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} else {
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fprintf(stderr, "I-type 1: funct3=101: unrecognized funct6: %b\n",
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funct6);
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exit(1);
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}
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} else if (funct3 == 0b111) {
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printf("andi %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else {
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fprintf(stderr, "I-type 1: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0000011: {
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PARSE_I_INS(ins);
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if (funct3 == 0b000) {
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printf("lb %s, %d(%s)\n", REGS[rd], imm, REGS[rs1]);
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} else if (funct3 == 0b001) {
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printf("lh %s, %d(%s)\n", REGS[rd], imm, REGS[rs1]);
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} else if (funct3 == 0b010) {
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printf("lw %s, %d(%s)\n", REGS[rd], imm, REGS[rs1]);
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} else if (funct3 == 0b011) {
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printf("ld %s, %d(%s)\n", REGS[rd], imm, REGS[rs1]);
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} else if (funct3 == 0b100) {
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printf("lbu %s, %d(%s)\n", REGS[rd], imm, REGS[rs1]);
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} else {
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fprintf(stderr, "I-type 2: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b1100111: {
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PARSE_I_INS(ins);
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printf("jalr %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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}; break;
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case 0b1110011: {
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PARSE_I_INS(ins);
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if (funct3 == 0b000) {
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if (imm == 0) {
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printf("ecall\n");
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} else {
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fprintf(stderr, "I-type 4: funct3=000 unrecognized imm: %b\n", imm);
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exit(1);
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}
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} else {
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fprintf(stderr, "I-type 4: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b1101111: {
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PARSE_J_INS(ins);
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printf("jal %s, %d\n", REGS[rd], imm);
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}; break;
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case 0b0110011: {
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PARSE_R_INS(ins);
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if (funct3 == 0b000) {
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if (funct7 == 0b0000000) {
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printf("add %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0100000) {
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printf("sub %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0000001) {
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printf("mul %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b000: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b001) {
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if (funct7 == 0b0000001) {
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printf("mulh %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b001: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b010) {
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if (funct7 == 0b0000000) {
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printf("slt %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b010: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b011) {
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if (funct7 == 0b0000000) {
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printf("sltu %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0000001) {
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printf("mulhu %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b011: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b100) {
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if (funct7 == 0b0000000) {
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printf("xor %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0000001) {
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printf("div %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b100: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b110) {
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if (funct7 == 0b0000001) {
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printf("rem %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0000000) {
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printf("or %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b110: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b111) {
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if (funct7 == 0b000) {
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printf("and %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b001) {
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printf("remu %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 1: funct3=0b111: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else {
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fprintf(stderr, "R-type 1: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0101111:
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fprintf(stderr, "R-type 2: unimplemented\n");
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exit(1);
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case 0b0111011: {
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PARSE_R_INS(ins);
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if (funct3 == 0b000) {
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if (funct7 == 0b0000000) {
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printf("addw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0100000) {
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printf("subw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct7 == 0b0000001) {
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printf("mulw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 3: funct3=000: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b100) {
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printf("divw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else if (funct3 == 0b101) {
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if (funct7 == 0b0000001) {
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printf("divuw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 3: funct3=101: unrecognized funct7: %b\n",
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funct7);
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exit(1);
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}
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} else if (funct3 == 0b111) {
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printf("remuw %s, %s, %s\n", REGS[rd], REGS[rs1], REGS[rs2]);
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} else {
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fprintf(stderr, "R-type 3: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0011011: {
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uint8_t funct3 = (ins >> 12) & 0b111;
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if (funct3 == 0b000) {
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PARSE_I_INS(ins);
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printf("addiw %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else if (funct3 == 0b001) {
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PARSE_I_INS(ins);
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printf("slliw %s, %s, %d\n", REGS[rd], REGS[rs1], imm);
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} else {
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fprintf(stderr, "R-type 4: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0100011: {
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PARSE_S_INS(ins);
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if (funct3 == 0b000) {
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printf("sb %s, %d(%s)\n", REGS[rs2], imm, REGS[rs1]);
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} else if (funct3 == 0b001) {
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printf("sh %s, %d(%s)\n", REGS[rs2], imm, REGS[rs1]);
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} else if (funct3 == 0b010) {
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printf("sw %s, %d(%s)\n", REGS[rs2], imm, REGS[rs1]);
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} else if (funct3 == 0b011) {
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printf("sd %s, %d(%s)\n", REGS[rs2], imm, REGS[rs1]);
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} else {
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fprintf(stderr, "S-type: unrecognized funct3: %03b\n", funct3);
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exit(1);
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}
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}; break;
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case 0b0110111: {
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PARSE_U_INS(ins);
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printf("lui %s, %d\n", REGS[rd], imm);
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}; break;
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case 0b0010111: {
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PARSE_U_INS(ins);
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printf("auipc %s, %d\n", REGS[rd], imm);
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}; break;
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default:
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fprintf(stderr, "Unrecognized opcode: %07b\n", opcode);
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exit(1);
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}
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}
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