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====== Stefan Hajnoczi: GDB Remote Debugging ====== ===== Notes ===== * Linux [[http://kgdb.linsyssoft.com/|kgdb]] [[http://kgdb.cvs.sourceforge.net/kgdb/kgdb-2/eth.patch?revision=1.60&view=markup|over Ethernet]] using the [[http://www.selenic.com/netpoll/|Netpoll API]]. === QEMU memory dumps === The QEMU monitor (''CTRL+ALT+2'') supports debug commands to inspect registers and memory. Unfortunately, QEMU only honors paged virtual memory. Since gPXE sets up a virtual memory segment with a non-zero base address, all virtual addresses need to be adjusted before using them to inspect memory in QEMU. The virtual memory offset is available inside gPXE as ''virt_offset'' (see ''arch/i386/transitions/librm.S''). It can be printed out by placing a ''printf'' call in ''core/main.c''. When dumping memory, remember to add the value of ''virt_offset'' to any virtual memory addresses. QEMU is effectively using physical memory only.


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