void cpuSetUpInterrupt(ULO new_interrupt_level) { UWO vector_offset = (UWO) (0x60 + new_interrupt_level*4); ULO vector_address = memoryReadLong(cpuGetVbr() + vector_offset); cpuActivateSSP(); // Switch to using ssp or msp. Loads a7 and preserves usp if we came from user-mode. cpuStackFrameGenerate(vector_offset, cpuGetPC()); // This will end up on msp if master is enabled, or on the ssp/isp if not. cpuSetSR(cpuGetSR() & 0x38ff); // Clear interrupt level cpuSetSR(cpuGetSR() | 0x2000); // Set supervisor mode cpuSetSR(cpuGetSR() | (UWO)(new_interrupt_level << 8)); // Set interrupt level #ifdef CPU_INSTRUCTION_LOGGING cpuCallInterruptLoggingFunc(new_interrupt_level, vector_address); #endif if (cpuGetModelMajor() >= 2 && cpuGetModelMajor() < 6) { if (cpuGetFlagMaster()) { // If the cpu was in master mode, preserve msp, and switch to using ssp (isp) in a7. ULO oldA7 = cpuGetAReg(7); cpuSetMspDirect(oldA7); cpuSetAReg(7, cpuGetSspDirect()); cpuFrame1(vector_offset, cpuGetPC()); // Make the throwaway frame on ssp/isp cpuSetSR(cpuGetSR() & 0xefff); // Clear master bit } } cpuInitializeFromNewPC(vector_address); cpuSetStop(FALSE); cpuSetRaiseInterrupt(FALSE); }
/// <summary> /// Sets the master stack pointer. /// </summary> void cpuSetMspAutoMap(ULO new_msp) { if (cpuGetFlagSupervisor() && cpuGetFlagMaster()) { cpuSetAReg(7, new_msp); } else { cpuSetMspDirect(new_msp); } }