Separate routine for fetching the current stack pointer

src/Targets/Microchip/AVR/AVR8/Avr8.cpp

@@ -254,6 +254,19 @@ void Avr8::setProgramCounter(std::uint32_t programCounter) {
     this->avr8Interface->setProgramCounter(programCounter);
 }
 
+std::uint32_t Avr8::getStackPointer() {
+    const auto stackPointerRegister = this->readRegisters(
+        {this->targetRegisterDescriptorsByType.at(TargetRegisterType::STACK_POINTER)}
+    ).front();
+
+    std::uint32_t stackPointer = 0;
+    for (std::size_t i = 0; i < stackPointerRegister.size() && i < 4; i++) {
+        stackPointer = (stackPointer << (8 * i)) | stackPointerRegister.value[i];
+    }
+
+    return stackPointer;
+}
+
 std::map<int, TargetPinState> Avr8::getPinStates(int variantId) {
     if (!this->targetVariantsById.contains(variantId)) {
         throw Exception("Invalid target variant ID");

src/Targets/Microchip/AVR/AVR8/Avr8.hpp

@@ -109,6 +109,8 @@ namespace Bloom::Targets::Microchip::Avr::Avr8Bit
         TargetRegister getProgramCounterRegister();
         void setProgramCounter(std::uint32_t programCounter) override;
 
+        std::uint32_t getStackPointer() override;
+
         std::map<int, TargetPinState> getPinStates(int variantId) override;
         void setPinState(
             const TargetPinDescriptor& pinDescriptor,

src/Targets/Target.hpp

@@ -275,6 +275,13 @@ namespace Bloom::Targets
          */
         virtual void setProgramCounter(std::uint32_t programCounter) = 0;
 
+        /**
+         * Should fetch the current stack pointer value.
+         *
+         * @return
+         */
+        virtual std::uint32_t getStackPointer() = 0;
+
         /**
          * Should get the current pin states for each pin on the target, mapped by pin number
          *