gdb - ybendito/tips GitHub Wiki

GDB cheat sheet

• attach: gdb -p $(pidof qemu-system-x86_64)

• info threads

• thread <id>

• memdump: x/8xg <mem>

• breakpoint:
  b procedure -> c -> break
  i r a5 (info registers a5) -> si (step instruction)

• vs.QEMU stub: qemu-riscv -s -S ...
  riscv-gdb riscv.elf
  target extended-remote localhost:1234
  

• signal processing (example):
  handle SIGUSR1 nostop print pass (to just prevent break on this signal)

• coredump analysis: (especially when the dump is lz4)
  coredumpctl list
coredumpctl info <pid>
coredumpctl gdb <pid>