gearmulator

Emulation of classic VA synths of the late 90s/2000s that are based on Motorola 56300 family DSPs
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wDsp.cpp (1141B)

      1 #include "wDsp.h"
      2 
      3 #include "dsp56kEmu/dsp.h"
      4 #include "dsp56kEmu/jitconfig.h"
      5 
      6 namespace wLib
      7 {
      8 	void Dsp::enableDynamicPeripheralAddressing(dsp56k::JitConfig& _config, dsp56k::DSP& _dsp, dsp56k::TWord _opA, dsp56k::TWord _opB, dsp56k::TWord _size)
      9 	{
     10 		// some startup code uses dynamic peripheral addressing, we allow this only for that code segment
     11 		_config.getBlockConfig = [this, _opA, _opB, _size, &_dsp](const dsp56k::TWord _pc) -> std::optional<dsp56k::JitConfig>
     12 		{
     13 			for (const auto& [start, size] : m_dynamicPeripheralAddressingRanges)
     14 			{
     15 				if(_pc < start || _pc > start + size)
     16 					continue;
     17 
     18 				auto c = _dsp.getJit().getConfig();
     19 				c.dynamicPeripheralAddressing = true;
     20 				return c;
     21 			}
     22 
     23 			// find the op as specified by parameters
     24 			// clr b M_AAR3,r2
     25 			const auto opA = _dsp.memory().get(dsp56k::MemArea_P, _pc);
     26 			const auto opB = _dsp.memory().get(dsp56k::MemArea_P, _pc + 1);
     27 
     28 			if(opA == _opA && opB == _opB)
     29 			{
     30 				m_dynamicPeripheralAddressingRanges.insert({_pc, _size});
     31 				auto c = _dsp.getJit().getConfig();
     32 				c.dynamicPeripheralAddressing = true;
     33 				return c;
     34 			}
     35 
     36 			return {};
     37 		};
     38 	}
     39 }