Gdb + gdb server + socat
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The document describes using socat as a proxy between GDB on a build server and GDB server on a BMC to enable remote debugging. It outlines the overall sequence: 1) Start socat, 2) Start GDB server which hangs until GDB connects, 3) Start GDB and configure sysroot, 4) Connect GDB to socat, 5) Debug, 6) Exit GDB which automatically stops GDB server and socat. It also provides details on socat, GDB server, and GDB commands used.
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Gdb + gdb server + socat
- 1. GDB + GDB Server via socat by Wei-Chung Wen @ 2015-05-15
- 2. Overall Sequence 1. Start socat as proxy 2. Start GDB server a. GDB server hangs until GDB connects b. No way to stop GDB server 3. Start GDB 4. Configure GDB sysroot 5. Connect GDB to socat 6. Debug 7. Exit GDB a. GDB server automatically stops b. socat automatically stops
- 3. socat ● Multipurpose relay (SOcket CAT) ● We use it as a proxy bridging GDB on build server and GDB server on BMC ● socat command ○ Template: socat FROM TO ○ Template: socat TCP4-LISTEN:5566 TCP4: 192.168.1.100:5566
- 4. GDB Server ● GDB server ~ 263KB ○ An agent complying with GDB’s instruction to debug programs ● GDB server command ○ Template: gdbserver :PORT CMD ARGS ○ Example: gdbserver :5566 /sbin/fullfw
- 5. GDB ● GDB ~ 4.2MB ● GDB command ○ Template: gdb CMD ARGS ○ Example: gdb build/rootfs/sbin/fullfw ● Internal comman for debugging via GDB server ○ set sysroot build/rootfs ○ target remote 192.168.1.100:5566
- 6. Demo and FAQ