Fixed alignment bug in EDBG and RISC-V drivers

src/DebugToolDrivers/Microchip/Protocols/Edbg/Avr/EdbgAvr8Interface.cpp

@@ -605,6 +605,10 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
         TargetMemorySize bytes,
         const std::set<Targets::TargetMemoryAddressRange>& excludedAddressRanges
     ) {
+        if (bytes == 0) {
+            return {};
+        }
+
         if (this->programmingModeEnabled && memorySegmentDescriptor.type == TargetMemorySegmentType::RAM) {
             throw Exception{"Cannot access RAM when programming mode is enabled"};
         }
@@ -742,6 +746,10 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
         TargetMemoryAddress startAddress,
         Targets::TargetMemoryBufferSpan buffer
     ) {
+        if (buffer.empty()) {
+            return;
+        }
+
         if (memorySegmentDescriptor.type == TargetMemorySegmentType::FLASH) {
             if (this->session.configVariant == Avr8ConfigVariant::XMEGA) {
                 const auto bootSectionStartAddress = this->session.programBootSection.value().get().startAddress;
@@ -1614,6 +1622,8 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
         TargetMemorySize bytes,
         const std::set<TargetMemoryAddress>& excludedAddresses
     ) {
+        assert(bytes > 0);
+
         if (type == Avr8MemoryType::FUSES && this->session.configVariant == Avr8ConfigVariant::DEBUG_WIRE) {
             throw Exception{"Cannot access AVR fuses via the debugWIRE interface"};
         }
@@ -1732,6 +1742,8 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
         TargetMemoryAddress startAddress,
         Targets::TargetMemoryBufferSpan buffer
     ) {
+        assert(!buffer.empty());
+
         if (type == Avr8MemoryType::FUSES && this->session.configVariant == Avr8ConfigVariant::DEBUG_WIRE) {
             throw Exception{"Cannot access AVR fuses via the debugWIRE interface"};
         }
@@ -1770,10 +1782,12 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
                     alignedBuffer.begin() + (startAddress - alignedStartAddress)
                 );
 
+                const auto backAlignmentBytes = alignedBytes - bytes - (startAddress - alignedStartAddress);
+                if (backAlignmentBytes > 0) {
                     const auto dataBack = this->readMemory(
                         readMemType,
                         startAddress + bytes,
-                    alignedBytes - bytes - (startAddress - alignedStartAddress),
+                        backAlignmentBytes,
                         {}
                     );
                     std::copy(
@@ -1781,6 +1795,7 @@ namespace DebugToolDrivers::Microchip::Protocols::Edbg::Avr
                         dataBack.end(),
                         alignedBuffer.begin() + (startAddress - alignedStartAddress) + bytes
                     );
+                }
 
                 return this->writeMemory(type, alignedStartAddress, alignedBuffer);
             }

src/DebugToolDrivers/Protocols/RiscVDebug/DebugTranslator.cpp

@@ -529,11 +529,13 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
                 alignedBuffer.begin() + (startAddress - alignedStartAddress)
             );
 
+            const auto backAlignmentBytes = alignedBytes - bytes - (startAddress - alignedStartAddress);
+            if (backAlignmentBytes > 0) {
                 const auto dataBack = this->readMemory(
                     addressSpaceDescriptor,
                     memorySegmentDescriptor,
                     startAddress + bytes,
-                alignedBytes - bytes - (startAddress - alignedStartAddress),
+                    backAlignmentBytes,
                     {}
                 );
                 std::copy(
@@ -541,6 +543,7 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
                     dataBack.end(),
                     alignedBuffer.begin() + (startAddress - alignedStartAddress) + bytes
                 );
+            }
 
             return this->writeMemory(
                 addressSpaceDescriptor,
@@ -958,6 +961,7 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
         Targets::TargetMemoryAddress startAddress,
         Targets::TargetMemorySize bytes
     ) {
+        assert(bytes > 0);
         assert(startAddress % DebugTranslator::WORD_BYTE_SIZE == 0);
         assert(bytes % DebugTranslator::WORD_BYTE_SIZE == 0);
 
@@ -1006,6 +1010,7 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
         Targets::TargetMemoryBufferSpan buffer
     ) {
         using DebugModule::Registers::MemoryAccessControlField;
+        assert(!buffer.empty());
         assert(startAddress % DebugTranslator::WORD_BYTE_SIZE == 0);
         assert(buffer.size() % DebugTranslator::WORD_BYTE_SIZE == 0);
 
@@ -1049,6 +1054,7 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
         Targets::TargetMemoryAddress startAddress,
         Targets::TargetMemorySize bytes
     ) {
+        assert(bytes > 0);
         assert(startAddress % DebugTranslator::WORD_BYTE_SIZE == 0);
         assert(bytes % DebugTranslator::WORD_BYTE_SIZE == 0);
 
@@ -1186,6 +1192,7 @@ namespace DebugToolDrivers::Protocols::RiscVDebug
         Targets::TargetMemoryAddress startAddress,
         Targets::TargetMemoryBufferSpan buffer
     ) {
+        assert(!buffer.empty());
         assert(startAddress % DebugTranslator::WORD_BYTE_SIZE == 0);
         assert(buffer.size() % DebugTranslator::WORD_BYTE_SIZE == 0);