Update to v089r02 release.

(r01 was not posted to the WIP thread)

byuu says:

r01 changelog:
- major improvements to SPC7110 MCU (memory controller unit)
- revised SPC7110 memory map to reflect aforementioned improvements
- added "Toggle Tracer" hotkey to target-ethos (only works for SFC so
  far, I plan to use this as a lightweight laevateinn for FEoEZ)

r02 changelog:
- quick fix: SRAM is mapped to 00-3f|80-bf:6000-7fff
- quick fix: $4830.d7 is SRAM chip enable, not SRAM write enable. Reads
  return 0x00 when this bit is clear

bsnes/emulator/emulator.hpp

@@ -3,7 +3,7 @@
 
 namespace Emulator {
   static const char Name[] = "bsnes";
-  static const char Version[] = "089";
+  static const char Version[] = "089.02";
   static const char Author[] = "byuu";
   static const char License[] = "GPLv3";
 }

bsnes/emulator/interface.hpp

@@ -98,7 +98,10 @@ struct Interface {
   virtual void cheatSet(const lstring& = lstring{}) {}
 
   //utility functions
-  virtual void updatePalette() {}
+  virtual void paletteUpdate() {}
+
+  //debugger functions
+  virtual bool tracerEnable(bool) { return false; }
 
   Interface() : bind(nullptr) {}
 };

bsnes/fc/interface/interface.cpp

@@ -76,7 +76,7 @@ void Interface::cheatSet(const lstring &list) {
   cheat.synchronize();
 }
 
-void Interface::updatePalette() {
+void Interface::paletteUpdate() {
   video.generate_palette();
 }
 

bsnes/fc/interface/interface.hpp

@@ -33,7 +33,7 @@ struct Interface : Emulator::Interface {
 
   void cheatSet(const lstring&);
 
-  void updatePalette();
+  void paletteUpdate();
 
   Interface();
 

bsnes/gb/interface/interface.cpp

@@ -99,7 +99,7 @@ void Interface::cheatSet(const lstring &list) {
   cheat.synchronize();
 }
 
-void Interface::updatePalette() {
+void Interface::paletteUpdate() {
   video.generate_palette();
 }
 

bsnes/gb/interface/interface.hpp

@@ -45,7 +45,7 @@ struct Interface : Emulator::Interface {
 
   void cheatSet(const lstring&);
 
-  void updatePalette();
+  void paletteUpdate();
 
   Interface();
 

bsnes/gba/interface/interface.cpp

@@ -79,7 +79,7 @@ bool Interface::unserialize(serializer &s) {
   return system.unserialize(s);
 }
 
-void Interface::updatePalette() {
+void Interface::paletteUpdate() {
   video.generate_palette();
 }
 

bsnes/gba/interface/interface.hpp

@@ -32,7 +32,7 @@ struct Interface : Emulator::Interface {
   serializer serialize();
   bool unserialize(serializer&);
 
-  void updatePalette();
+  void paletteUpdate();
 
   Interface();
 

bsnes/nall/snes/cartridge.hpp

@@ -158,26 +158,11 @@ SuperFamicomCartridge::SuperFamicomCartridge(const uint8_t *data, unsigned size)
 
   else if(has_spc7110) {
     markup.append(
-      "  <rom>\n"
-      "    <map mode='shadow' address='00-0f:8000-ffff'/>\n"
-      "    <map mode='shadow' address='80-bf:8000-ffff'/>\n"
-      "    <map mode='linear' address='c0-cf:0000-ffff'/>\n"
-      "  </rom>\n"
       "  <spc7110>\n"
-      "    <ram size='0x", hex(ram_size), "'>\n"
-      "      <map mode='linear' address='00:6000-7fff'/>\n"
-      "      <map mode='linear' address='30:6000-7fff'/>\n"
-      "    </ram>\n"
       "    <mmio>\n"
       "      <map address='00-3f:4800-483f'/>\n"
       "      <map address='80-bf:4800-483f'/>\n"
       "    </mmio>\n"
-      "    <mcu>\n"
-      "      <map address='d0-ff:0000-ffff' offset='0x100000' size='0x", hex(size - 0x100000), "'/>\n"
-      "    </mcu>\n"
-      "    <dcu>\n"
-      "      <map address='50:0000-ffff'/>\n"
-      "    </dcu>\n"
     );
     if(has_spc7110rtc) markup.append(
       "    <rtc>\n"
@@ -186,6 +171,22 @@ SuperFamicomCartridge::SuperFamicomCartridge(const uint8_t *data, unsigned size)
       "    </rtc>\n"
     );
     markup.append(
+      "    <dcu>\n"
+      "      <map address='50:0000-ffff'/>\n"
+      "    </dcu>\n"
+      "    <mcu>\n"
+      "      <rom>\n"
+      "        <program offset='0x000000' size='0x100000'/>\n"
+      "        <data offset='0x100000' size='", hex(rom_size - 0x100000), "'/>\n"
+      "        <map address='00-0f:8000-ffff'/>\n"
+      "        <map address='80-bf:8000-ffff'/>\n"
+      "        <map address='c0-cf:0000-ffff'/>\n"
+      "      </rom>\n"
+      "      <ram size='0x", hex(ram_size), "'>\n"
+      "        <map address='00-3f:6000-7fff'/>\n"
+      "        <map address='80-bf:6000-7fff'/>\n"
+      "      </ram>\n"
+      "    </mcu>\n"
       "  </spc7110>\n"
     );
   }

bsnes/processor/r65816/disassembler.cpp

@@ -424,9 +424,5 @@ void R65816::disassemble_opcode(char *output, uint32 addr) {
       regs.p.z ? 'Z' : 'z', regs.p.c ? 'C' : 'c');
   }
 
-  strcat(s, t);
-//strcat(s, " ");
-
-//sprintf(t, "V:%3d H:%4d", cpu.vcounter(), cpu.hcounter());
   strcat(s, t);
 }

bsnes/sfc/cartridge/markup.cpp

@@ -400,19 +400,19 @@ void Cartridge::parse_markup_spc7110(XML::Node &root) {
   has_spc7110 = true;
   has_spc7110rtc = root["rtc"].exists();
 
-  auto &ram = root["ram"];
   auto &mmio = root["mmio"];
-  auto &mcu = root["mcu"];
-  auto &dcu = root["dcu"];
   auto &rtc = root["rtc"];
+  auto &dcu = root["dcu"];
+  auto &mcurom = root["mcu"]["rom"];
+  auto &mcuram = root["mcu"]["ram"];
 
-  ram_size = numeral(ram["size"].data);
-  for(auto &node : ram) {
-    if(node.name != "map") continue;
-    Mapping m({ &SPC7110::ram_read, &spc7110 }, { &SPC7110::ram_write, &spc7110 });
-    parse_markup_map(m, node);
-    mapping.append(m);
-  }
+  spc7110.prom_base = numeral(mcurom["program"]["offset"].data);
+  spc7110.prom_size = numeral(mcurom["program"]["size"].data);
+
+  spc7110.drom_base = numeral(mcurom["data"]["offset"].data);
+  spc7110.drom_size = numeral(mcurom["data"]["size"].data);
+
+  ram_size = numeral(mcuram["size"].data);
 
   for(auto &node : mmio) {
     if(node.name != "map") continue;
@@ -421,11 +421,9 @@ void Cartridge::parse_markup_spc7110(XML::Node &root) {
     mapping.append(m);
   }
 
-  spc7110.data_rom_offset = numeral(mcu["offset"].data);
-  if(spc7110.data_rom_offset == 0) spc7110.data_rom_offset = 0x100000;
-  for(auto &node : mcu) {
+  for(auto &node : rtc) {
     if(node.name != "map") continue;
-    Mapping m({ &SPC7110::mcu_read, &spc7110 }, { &SPC7110::mcu_write, &spc7110 });
+    Mapping m({&SPC7110::mmio_read, &spc7110}, {&SPC7110::mmio_write, &spc7110});
     parse_markup_map(m, node);
     mapping.append(m);
   }
@@ -437,9 +435,16 @@ void Cartridge::parse_markup_spc7110(XML::Node &root) {
     mapping.append(m);
   }
 
-  for(auto &node : rtc) {
+  for(auto &node : mcurom) {
     if(node.name != "map") continue;
-    Mapping m({ &SPC7110::mmio_read, &spc7110 }, { &SPC7110::mmio_write, &spc7110 });
+    Mapping m({&SPC7110::mcurom_read, &spc7110}, {&SPC7110::mcurom_write, &spc7110});
+    parse_markup_map(m, node);
+    mapping.append(m);
+  }
+
+  for(auto &node : mcuram) {
+    if(node.name != "map") continue;
+    Mapping m({&SPC7110::mcuram_read, &spc7110}, {&SPC7110::mcuram_write, &spc7110});
     parse_markup_map(m, node);
     mapping.append(m);
   }

bsnes/sfc/chip/spc7110/decomp.cpp

@@ -24,9 +24,8 @@ void SPC7110::Decomp::write(uint8 data) {
 }
 
 uint8 SPC7110::Decomp::dataread() {
-  unsigned size = cartridge.rom.size() - spc7110.data_rom_offset;
-  while(decomp_offset >= size) decomp_offset -= size;
-  return cartridge.rom.read(spc7110.data_rom_offset + decomp_offset++);
+  unsigned addr = Bus::mirror(decomp_offset++, spc7110.drom_size);
+  return cartridge.rom.read(spc7110.drom_base + addr);
 }
 
 void SPC7110::Decomp::init(unsigned mode, unsigned offset, unsigned index) {

bsnes/sfc/chip/spc7110/serialization.cpp

@@ -65,10 +65,6 @@ void SPC7110::serialize(serializer &s) {
   s.integer(r4833);
   s.integer(r4834);
 
-  s.integer(dx_offset);
-  s.integer(ex_offset);
-  s.integer(fx_offset);
-
   s.integer(r4840);
   s.integer(r4841);
   s.integer(r4842);

bsnes/sfc/chip/spc7110/spc7110.cpp

@@ -71,9 +71,9 @@ void SPC7110::reset() {
   r482f = 0x00;
 
   r4830 = 0x00;
-  mmio_write(0x4831, 0);
-  mmio_write(0x4832, 1);
-  mmio_write(0x4833, 2);
+  r4831 = 0x00;
+  r4832 = 0x01;
+  r4833 = 0x02;
   r4834 = 0x00;
 
   r4840 = 0x00;
@@ -88,9 +88,8 @@ void SPC7110::reset() {
 }
 
 unsigned SPC7110::datarom_addr(unsigned addr) {
-  unsigned size = cartridge.rom.size() - data_rom_offset;
-  while(addr >= size) addr -= size;
-  return data_rom_offset + addr;
+  addr = Bus::mirror(addr, drom_size);
+  return drom_base + addr;
 }
 
 unsigned SPC7110::data_pointer()   { return r4811 + (r4812 << 8) + (r4813 << 16); }
@@ -194,6 +193,7 @@ uint8 SPC7110::mmio_read(unsigned addr) {
   addr &= 0xffff;
 
   switch(addr) {
+
   //==================
   //decompression unit
   //==================
@@ -333,6 +333,7 @@ uint8 SPC7110::mmio_read(unsigned addr) {
     r4842 &= 0x7f;
     return status;
   }
+
   }
 
   return cpu.regs.mdr;
@@ -342,6 +343,7 @@ void SPC7110::mmio_write(unsigned addr, uint8 data) {
   addr &= 0xffff;
 
   switch(addr) {
+
   //==================
   //decompression unit
   //==================
@@ -530,24 +532,11 @@ void SPC7110::mmio_write(unsigned addr, uint8 data) {
   //memory mapping unit
   //===================
 
-    case 0x4830: r4830 = data; break;
-
-    case 0x4831: {
-      r4831 = data;
-      dx_offset = datarom_addr(data * 0x100000);
-    } break;
-
-    case 0x4832: {
-      r4832 = data;
-      ex_offset = datarom_addr(data * 0x100000);
-    } break;
-
-    case 0x4833: {
-      r4833 = data;
-      fx_offset = datarom_addr(data * 0x100000);
-    } break;
-
-    case 0x4834: r4834 = data; break;
+  case 0x4830: r4830 = data & 0x87; break;
+  case 0x4831: r4831 = data & 0x07; break;
+  case 0x4832: r4832 = data & 0x07; break;
+  case 0x4833: r4833 = data & 0x07; break;
+  case 0x4834: r4834 = data & 0x07; break;
 
   //====================
   //real-time clock unit
@@ -628,26 +617,13 @@ void SPC7110::mmio_write(unsigned addr, uint8 data) {
       } break;
     } //switch(rtc_state)
   } break;
+
   }
 }
 
 SPC7110::SPC7110() {
 }
 
-//============
-//SPC7110::MCU
-//============
-
-uint8 SPC7110::mcu_read(unsigned addr) {
-  if(addr <= 0xdfffff) return cartridge.rom.read(dx_offset + (addr & 0x0fffff));
-  if(addr <= 0xefffff) return cartridge.rom.read(ex_offset + (addr & 0x0fffff));
-  if(addr <= 0xffffff) return cartridge.rom.read(fx_offset + (addr & 0x0fffff));
-  return cpu.regs.mdr;
-}
-
-void SPC7110::mcu_write(unsigned addr, uint8 data) {
-}
-
 //============
 //SPC7110::DCU
 //============
@@ -659,16 +635,86 @@ uint8 SPC7110::dcu_read(unsigned) {
 void SPC7110::dcu_write(unsigned, uint8) {
 }
 
-//============
-//SPC7110::RAM
-//============
+//===============
+//SPC7110::MCUROM
+//===============
 
-uint8 SPC7110::ram_read(unsigned addr) {
-  return cartridge.ram.read(addr & 0x1fff);
+uint8 SPC7110::mcurom_read(unsigned addr) {
+  unsigned bank = 0;
+
+  if((addr & 0x708000) == 0x008000  //$00-0f|80-8f:8000-ffff
+  || (addr & 0xf00000) == 0xc00000  //      $c0-cf:0000-ffff
+  ) {
+    addr &= 0x0fffff;
+    if(true) {  //8mbit PROM
+      return cartridge.rom.read(prom_base + bus.mirror(0x000000 + addr, prom_size));
+    }
+    return mcurom_read_data(r4830 & 7, addr);
   }
 
-void SPC7110::ram_write(unsigned addr, uint8 data) {
-  if(r4830 & 0x80) cartridge.ram.write(addr & 0x1fff, data);
+  if((addr & 0x708000) == 0x108000  //$10-1f|90-9f:8000-ffff
+  || (addr & 0xf00000) == 0xd00000  //      $d0-df:0000-ffff
+  ) {
+    addr &= 0x0fffff;
+    if(r4834 & 4) {  //16mbit PROM
+      return cartridge.rom.read(prom_base + bus.mirror(0x100000 + addr, prom_size));
+    }
+    return mcurom_read_data(r4831 & 7, addr);
+  }
+
+  if((addr & 0x708000) == 0x208000  //$20-2f|a0-af:8000-ffff
+  || (addr & 0xf00000) == 0xe00000  //      $e0-ef:0000-ffff
+  ) {
+    addr &= 0x0fffff;
+    return mcurom_read_data(r4832 & 7, addr);
+  }
+
+  if((addr & 0x708000) == 0x308000  //$30-3f|b0-bf:8000-ffff
+  || (addr & 0xf00000) == 0xf00000  //      $f0-ff:0000-ffff
+  ) {
+    addr &= 0x0fffff;
+    return mcurom_read_data(r4833 & 7, addr);
+  }
+
+  return cpu.regs.mdr;
+}
+
+uint8 SPC7110::mcurom_read_data(unsigned bank, unsigned addr) {
+  unsigned mask = (1 << (r4834 & 3)) - 1;  //8mbit, 16mbit, 32mbit, 64mbit DROM
+  unsigned range = 0x100000 * (1 + mask);
+  unsigned offset = 0x100000 * (bank & mask);
+
+  //mirroring behavior is non-sensical. assuming a 32mbit data ROM:
+  //banks 4-7 with mask 0-2 returns 0x00; banks 4-7 with mask 3 mirrors banks 0-3
+  if(range <= drom_size && offset >= drom_size) return 0x00;
+
+  return cartridge.rom.read(drom_base + bus.mirror(offset + addr, drom_size));
+}
+
+void SPC7110::mcurom_write(unsigned addr, uint8 data) {
+}
+
+//===============
+//SPC7110::MCURAM
+//===============
+
+uint8 SPC7110::mcuram_read(unsigned addr) {
+  //$00-3f|80-bf:6000-7fff
+  if(r4830 & 0x80) {
+    unsigned bank = (addr >> 16) & 0x3f;
+    addr = bus.mirror(bank * 0x2000 + (addr & 0x1fff), cartridge.ram.size());
+    return cartridge.ram.read(addr);
+  }
+  return 0x00;
+}
+
+void SPC7110::mcuram_write(unsigned addr, uint8 data) {
+  //$00-3f|80-bf:6000-7fff
+  if(r4830 & 0x80) {
+    unsigned bank = (addr >> 16) & 0x3f;
+    addr = bus.mirror(bank * 0x2000 + (addr & 0x1fff), cartridge.ram.size());
+    cartridge.ram.write(addr, data);
+  }
 }
 
 }

bsnes/sfc/chip/spc7110/spc7110.hpp

@@ -3,7 +3,8 @@
 
 struct SPC7110 {
   uint8 rtc[20];
-  unsigned data_rom_offset;
+  unsigned prom_base, prom_size;  //program ROM
+  unsigned drom_base, drom_size;  //data ROM
 
   void init();
   void load();
@@ -25,14 +26,15 @@ struct SPC7110 {
   uint8 mmio_read(unsigned addr);
   void mmio_write(unsigned addr, uint8 data);
 
-  uint8 mcu_read(unsigned addr);
-  void mcu_write(unsigned addr, uint8 data);
-
   uint8 dcu_read(unsigned);
   void dcu_write(unsigned, uint8);
 
-  uint8 ram_read(unsigned addr);
-  void ram_write(unsigned addr, uint8 data);
+  uint8 mcurom_read(unsigned addr);
+  uint8 mcurom_read_data(unsigned bank, unsigned addr);
+  void mcurom_write(unsigned addr, uint8 data);
+
+  uint8 mcuram_read(unsigned addr);
+  void mcuram_write(unsigned addr, uint8 data);
 
   //spc7110decomp
   void decomp_init();
@@ -101,15 +103,11 @@ private:
   //===================
   //memory mapping unit
   //===================
-  uint8 r4830;  //SRAM write enable
-  uint8 r4831;  //$[d0-df]:[0000-ffff] mapping
-  uint8 r4832;  //$[e0-ef]:[0000-ffff] mapping
-  uint8 r4833;  //$[f0-ff]:[0000-ffff] mapping
-  uint8 r4834;  //???
-
-  unsigned dx_offset;
-  unsigned ex_offset;
-  unsigned fx_offset;
+  uint8 r4830;  //bank 0 mapping + SRAM write enable
+  uint8 r4831;  //bank 1 mapping
+  uint8 r4832;  //bank 2 mapping
+  uint8 r4833;  //bank 3 mapping
+  uint8 r4834;  //bank mapping control
 
   //====================
   //real-time clock unit

bsnes/sfc/cpu/cpu.cpp

@@ -86,6 +86,11 @@ void CPU::enter() {
 
 void CPU::op_step() {
   debugger.op_exec(regs.pc.d);
+  if(interface->tracer.open()) {
+    char text[4096];
+    disassemble_opcode(text, regs.pc.d);
+    interface->tracer.print(text, "\n");
+  }
 
   (this->*opcode_table[op_readpc()])();
 }

bsnes/sfc/interface/interface.cpp

@@ -174,6 +174,7 @@ void Interface::save(unsigned id, const stream &stream) {
 
 void Interface::unload() {
   cartridge.unload();
+  tracerEnable(false);
 }
 
 void Interface::connect(unsigned port, unsigned device) {
@@ -230,10 +231,30 @@ void Interface::cheatSet(const lstring &list) {
   cheat.synchronize();
 }
 
-void Interface::updatePalette() {
+void Interface::paletteUpdate() {
   video.generate_palette();
 }
 
+bool Interface::tracerEnable(bool trace) {
+  string pathname = path(group(ID::ROM));
+
+  if(trace == true && !tracer.open()) {
+    for(unsigned n = 0; n <= 999; n++) {
+      string filename = {pathname, "trace-", decimal<3, '0'>(n), ".log"};
+      if(file::exists(filename)) continue;
+      tracer.open(filename, file::mode::write);
+      return true;
+    }
+  }
+
+  if(trace == false && tracer.open()) {
+    tracer.close();
+    return true;
+  }
+
+  return false;
+}
+
 Interface::Interface() {
   interface = this;
   system.init();

bsnes/sfc/interface/interface.hpp

@@ -53,11 +53,13 @@ struct Interface : Emulator::Interface {
 
   void cheatSet(const lstring&);
 
-  void updatePalette();
+  void paletteUpdate();
+
+  bool tracerEnable(bool);
 
   Interface();
 
-private:
+  file tracer;
   vector<Device> device;
 };
 

bsnes/sfc/memory/memory-inline.hpp

@@ -51,6 +51,24 @@ MappedRAM::MappedRAM() : data_(nullptr), size_(0), write_protect_(false) {}
 
 //Bus
 
+unsigned Bus::mirror(unsigned addr, unsigned size) {
+  unsigned base = 0;
+  if(size) {
+    unsigned mask = 1 << 23;
+    while(addr >= size) {
+      while(!(addr & mask)) mask >>= 1;
+      addr -= mask;
+      if(size > mask) {
+        size -= mask;
+        base += mask;
+      }
+      mask >>= 1;
+    }
+    base += addr;
+  }
+  return base;
+}
+
 uint8 Bus::read(unsigned addr) {
   if(cheat.override[addr]) return cheat.read(addr);
   return reader[lookup[addr]](target[addr]);

bsnes/sfc/memory/memory.cpp

@@ -5,24 +5,6 @@ namespace SuperFamicom {
 
 Bus bus;
 
-unsigned Bus::mirror(unsigned addr, unsigned size) {
-  unsigned base = 0;
-  if(size) {
-    unsigned mask = 1 << 23;
-    while(addr >= size) {
-      while(!(addr & mask)) mask >>= 1;
-      addr -= mask;
-      if(size > mask) {
-        size -= mask;
-        base += mask;
-      }
-      mask >>= 1;
-    }
-    base += addr;
-  }
-  return base;
-}
-
 void Bus::map(
   MapMode mode,
   unsigned bank_lo, unsigned bank_hi,

bsnes/sfc/memory/memory.hpp

@@ -42,7 +42,7 @@ private:
 };
 
 struct Bus {
-  unsigned mirror(unsigned addr, unsigned size);
+  alwaysinline static unsigned mirror(unsigned addr, unsigned size);
 
   alwaysinline uint8 read(unsigned addr);
   alwaysinline void write(unsigned addr, uint8 data);

bsnes/target-ethos/Makefile

@@ -74,6 +74,8 @@ ifeq ($(USER),root)
 	@echo The installer needs to know your home directory to install important files.
 else ifeq ($(platform),x)
 	sudo install -D -m 755 out/$(name) $(DESTDIR)$(prefix)/bin/$(name)
+	sudo install -D -m 644 data/$(name).png $(DESTDIR)$(prefix)/share/pixmaps/$(name).png
+	sudo install -D -m 644 data/$(name).desktop $(DESTDIR)$(prefix)/share/applications/$(name).desktop
 
 	mkdir -p ~/.config/$(name)
 	cp -R profile/* ~/.config/$(name)

bsnes/target-ethos/input/hotkeys.cpp

@@ -119,6 +119,16 @@ void InputManager::appendHotkeys() {
     };
   }
 
+  {
+    auto hotkey = new HotkeyInput;
+    hotkey->name    = "Toggle Tracer";
+    hotkey->mapping = "None";
+
+    hotkey->press = [&] {
+      utility->tracerToggle();
+    };
+  }
+
   for(auto &hotkey : hotkeyMap) {
     string name = {"Hotkey::", hotkey->name};
     name.replace(" ", "");

bsnes/target-ethos/settings/video.cpp

@@ -59,5 +59,5 @@ void VideoSettings::synchronize() {
   overscanHorizontal.value.setText({config->video.maskOverscanHorizontal, "px"});
   overscanVertical.value.setText({config->video.maskOverscanVertical, "px"});
 
-  if(application->active) system().updatePalette();
+  if(application->active) system().paletteUpdate();
 }

bsnes/target-ethos/utility/utility.cpp

@@ -99,7 +99,7 @@ void Utility::load() {
 
   loadMemory();
 
-  system().updatePalette();
+  system().paletteUpdate();
   synchronizeDSP();
 
   resize();
@@ -109,6 +109,7 @@ void Utility::load() {
 
 void Utility::unload() {
   if(application->active == nullptr) return;
+  if(tracerEnable) tracerToggle();
 
   saveMemory();
   system().unload();
@@ -143,6 +144,16 @@ void Utility::loadState(unsigned slot) {
   showMessage({"Loaded from slot ", slot});
 }
 
+void Utility::tracerToggle() {
+  if(application->active == nullptr) return;
+  tracerEnable = !tracerEnable;
+  bool result = system().tracerEnable(tracerEnable);
+  if( tracerEnable &&  result) return utility->showMessage("Tracer activated");
+  if( tracerEnable && !result) return tracerEnable = false, utility->showMessage("Unable to activate tracer");
+  if(!tracerEnable &&  result) return utility->showMessage("Tracer deactivated");
+  if(!tracerEnable && !result) return utility->showMessage("Unable to deactivate tracer");
+}
+
 void Utility::synchronizeDSP() {
   if(application->active == nullptr) return;
 
@@ -280,5 +291,6 @@ void Utility::showMessage(const string &message) {
 }
 
 Utility::Utility() {
+  tracerEnable = false;
   statusTime = 0;
 }

bsnes/target-ethos/utility/utility.hpp

@@ -16,6 +16,8 @@ struct Utility {
   void saveState(unsigned slot);
   void loadState(unsigned slot);
 
+  void tracerToggle();
+
   void synchronizeDSP();
   void synchronizeRuby();
   void updateShader();
@@ -32,6 +34,7 @@ struct Utility {
   lstring pathname;
 
 private:
+  bool tracerEnable;
   string statusText;
   string statusMessage;
   time_t statusTime;