diff options
Diffstat (limited to 'qdme.c')
| -rwxr-xr-x | qdme.c | 57 |
1 files changed, 37 insertions, 20 deletions
@@ -4,7 +4,7 @@ #include <arpa/inet.h> #include "qdme.h" -uint8_t memory[MEM_SIZE] = {0}; +uint8_t memory[MEM_SIZE * WORD_SIZE] = {0}; uint32_t pc = 0, hi = 0, lo = 0; uint32_t regFile[32] = {0}; @@ -13,7 +13,6 @@ uint32_t regFile[32] = {0}; void InstFetch(inst_t *inst) { uint32_t value = 0; memcpy(&value, memory + pc, WORD_SIZE); - value = ntohl(value); switch ((value & 0xFC000000) >> 24) { case 0: inst->type = RTYPE; @@ -185,6 +184,7 @@ void InstExec(const inst_t inst) { if (inst.type == NOP) { return; } + int16_t imm = inst.i.imm; switch (inst.j.op) { case 0: // R-type instruction ExecRtype(inst); @@ -197,43 +197,41 @@ void InstExec(const inst_t inst) { break; case 4: // beq pc = (regFile[inst.i.rs] == regFile[inst.i.rt]) ? pc + 4 + - inst.i.imm : pc; + imm : pc; break; case 5: // bne pc = (regFile[inst.i.rs] != regFile[inst.i.rt]) ? pc + 4 + - inst.i.imm : pc; + imm : pc; break; case 8: // addi - regFile[inst.i.rt] = (signed)inst.i.rs + (signed)inst.i.imm; + regFile[inst.i.rt] = (signed)inst.i.rs + imm; break; case 9: // addiu - regFile[inst.i.rt] = inst.i.rs + inst.i.imm; + regFile[inst.i.rt] = inst.i.rs + (uint16_t)imm; break; case 12: // andi - regFile[inst.i.rt] = inst.i.rs & inst.i.imm; + regFile[inst.i.rt] = inst.i.rs & (uint16_t)imm; break; case 13: // ori - regFile[inst.i.rt] = inst.i.rs | inst.i.imm; + regFile[inst.i.rt] = inst.i.rs | (uint16_t)imm; break; case 14: // xori - regFile[inst.i.rt] = inst.i.rs ^ inst.i.imm; + regFile[inst.i.rt] = inst.i.rs ^ (uint16_t)imm; break; case 10: // slti - regFile[inst.i.rt] = (signed)inst.i.rs < (signed)inst.i.imm; + regFile[inst.i.rt] = (signed)inst.i.rs < imm; break; case 11: // sltiu - regFile[inst.i.rt] = inst.i.rs < inst.i.imm; + regFile[inst.i.rt] = inst.i.rs < (uint16_t)imm; break; case 15: // lui - regFile[inst.i.rt] = inst.i.imm << 16; + regFile[inst.i.rt] = (uint16_t)imm << 16; break; case 35: // lw - memcpy(regFile + inst.i.rs, memory + inst.i.rt + inst.i.imm, - WORD_SIZE); + memcpy(regFile + inst.i.rs, memory + inst.i.rt + imm, WORD_SIZE); break; case 43: // sw - memcpy(memory + inst.i.rt + inst.i.imm, regFile + inst.i.rs, - WORD_SIZE); + memcpy(memory + inst.i.rt + imm, regFile + inst.i.rs, WORD_SIZE); break; } } @@ -255,12 +253,31 @@ int LoadBinary(const char * const path) { perror("LoadBinary"); return -1; } - int8_t byte = 0; - size_t i = 0; - while ((byte = fgetc(fp)) != EOF && i < MEM_SIZE) { - memory[i++] = byte; + + uint8_t *freeMem = memory; + size_t i = 0, offset = 0; + while ((i = fread(freeMem + offset, sizeof(memory[0]), (MEM_SIZE * WORD_SIZE) - offset, fp)) != 0) { + offset += i; + } + + if (ferror(fp) || !feof(fp)) { + perror("fread"); + return -1; } + fclose(fp); + + /* Convert from Big Endian to Little Endian */ + uint32_t test = 10; + if (test != ntohl(test)) { + for (size_t j = 0; j < offset; j += WORD_SIZE) { + uint32_t word = 0; + memcpy(&word, memory + j, WORD_SIZE); + word = ntohl(word); + memcpy(memory + j, &word, WORD_SIZE); + } + } + return 0; } |