45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
#include <core/Interpreter.hpp>
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#include <log.hpp>
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namespace n64 {
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inline bool ShouldServiceInterrupt(Registers& regs) {
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bool interrupts_pending = (regs.cop0.status.im & regs.cop0.cause.interruptPending) != 0;
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bool interrupts_enabled = regs.cop0.status.ie == 1;
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bool currently_handling_exception = regs.cop0.status.exl == 1;
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bool currently_handling_error = regs.cop0.status.erl == 1;
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return interrupts_pending && interrupts_enabled &&
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!currently_handling_exception && !currently_handling_error;
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}
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inline void CheckCompareInterrupt(MI& mi, Registers& regs) {
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regs.cop0.count++;
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regs.cop0.count &= 0x1FFFFFFFF;
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if(regs.cop0.count == (u64)regs.cop0.compare << 1) {
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regs.cop0.cause.ip7 = 1;
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UpdateInterrupt(mi, regs);
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}
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}
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void Interpreter::Step(Mem& mem, Registers& regs) {
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regs.gpr[0] = 0;
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CheckCompareInterrupt(mem.mmio.mi, regs);
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regs.prevDelaySlot = regs.delaySlot;
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regs.delaySlot = false;
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if(ShouldServiceInterrupt(regs)) {
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FireException(regs, ExceptionCode::Interrupt, 0, false);
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return;
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}
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u32 instruction = mem.Read32(regs, regs.pc, regs.pc);
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regs.oldPC = regs.pc;
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regs.pc = regs.nextPC;
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regs.nextPC += 4;
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Exec(regs, mem, instruction);
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}
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} |