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Overview

The Thru VM supports debugging via the GDB remote server protocol. Clients such as GDB and LLDB which support RISC-V can connect to a running VM instance, and can inspect and alter execution.

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Remote Server Protocol

The GDB remote server protocol specifies how clients, such as GDB, interact with a running remote, which in this case is the Thru VM. When the VM is run in debug mode, it accepts a connection over TCP, by default on port 9001. Using target remote localhost:9001, GDB can connect to the VM and start debugging. Several important commands are supported, including:
  • g/G: Read and write registers
  • m/M: Read and write memory
  • z/Z: Set and clear breakpoints and watchpoints