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@ -140,10 +140,12 @@ static void cpu_execute(rv32_cpu_t* cpu, instruction_t* instruction) |
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case OPCODE_JALR: |
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{ |
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// Jump And Link Register
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cpu->regs.x[instruction->rd] = cpu->pc + 4; |
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uint32_t old_pc = cpu->pc; |
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// Sign extend immediate from 12 bits to 32 bits
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uint32_t immediate = (instruction->immediate & 0xFFF) | (instruction->immediate & 0x800 ? 0xFFFFF000 : 0); |
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cpu->pc = ((cpu->regs.x[instruction->rs1] + immediate) & 0xFFFFFFFE) - 4; |
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// Save old pc
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cpu->regs.x[instruction->rd] = old_pc + 4; |
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break; |
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} |
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case OPCODE_BRANCH: |
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