gdbstub: fixup replaced instruction bytes in memory reads
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@ -263,6 +263,23 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
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std::vector<u8> mem(size);
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if (system.ApplicationMemory().ReadBlock(addr, mem.data(), size)) {
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// Restore any bytes belonging to replaced instructions.
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auto it = replaced_instructions.lower_bound(addr);
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for (; it != replaced_instructions.end() && it->first < addr + size; it++) {
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// Get the bytes of the instruction we previously replaced.
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const u32 original_bytes = it->second;
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// Calculate where to start writing to the output buffer.
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const size_t output_offset = it->first - addr;
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// Calculate how many bytes to write.
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// The loop condition ensures output_offset < size.
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const size_t n = std::min<size_t>(size - output_offset, sizeof(u32));
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// Write the bytes to the output buffer.
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std::memcpy(mem.data() + output_offset, &original_bytes, n);
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}
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SendReply(Common::HexToString(mem));
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} else {
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SendReply(GDB_STUB_REPLY_ERR);
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