19 lines
816 B
Rust
19 lines
816 B
Rust
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use super::super::cpu::{Core, CpuPipelineAction, CpuError, CpuInstruction, CpuExecResult};
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use super::super::sysbus::SysBus;
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use super::{ArmInstruction, ArmInstructionFormat};
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impl Core {
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pub fn exec_arm(&mut self, sysbus: &mut SysBus, insn: ArmInstruction) -> CpuExecResult {
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match insn.fmt {
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ArmInstructionFormat::BX => {
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self.pc = self.get_reg(insn.rn());
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Ok((CpuInstruction::Arm(insn), CpuPipelineAction::Branch))
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},
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ArmInstructionFormat::B_BL => {
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self.pc = (self.pc as i32).wrapping_add(insn.branch_offset()) as u32;
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Ok((CpuInstruction::Arm(insn), CpuPipelineAction::Branch))
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}
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fmt => Err(CpuError::UnimplementedCpuInstruction(CpuInstruction::Arm(insn))),
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}
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}
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}
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