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gdbstub: fixup replaced instruction bytes in memory reads

This commit is contained in:
Liam 2023-08-14 16:33:27 -04:00
parent 58a4c86797
commit fbda084acb

View file

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