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Gdb: Difference between revisions
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<tt>display</tt> will evaluate and print an expression after each command run. | <tt>display</tt> will evaluate and print an expression after each command run. | ||
* Use <tt>display/i $pc</tt> to get the current instruction address and decode | * Use <tt>display/i $pc</tt> to get the current instruction address and decode | ||
** <tt>2i</tt> will give you the current and next instruction | |||
==Control flow== | |||
* Use <tt>finish</tt> to move to the end of a stack frame | |||
* Use <tt>step</tt> and <tt>stepi</tt> to move forward, descending into new stack frames | |||
* Use <tt>next</tt> and <tt>nexti</tt> to move forward, skipping over new stack frames | |||
* Export <tt>LD_BIND_NOW=1</tt> to force early symbol binding. This eliminates annoying dl code when resolving the [[ELF|.plt section]] | |||
* Use <tt>set follow-fork-mode child</tt> to follow the child of <tt>fork</tt>/<tt>vfork</tt> | |||
==Stacktraces== | |||
* Stacktrace of all threads -- <tt>thread apply all bt</tt> | |||
Latest revision as of 20:45, 7 October 2019
Display
display will evaluate and print an expression after each command run.
- Use display/i $pc to get the current instruction address and decode
- 2i will give you the current and next instruction
Control flow
- Use finish to move to the end of a stack frame
- Use step and stepi to move forward, descending into new stack frames
- Use next and nexti to move forward, skipping over new stack frames
- Export LD_BIND_NOW=1 to force early symbol binding. This eliminates annoying dl code when resolving the .plt section
- Use set follow-fork-mode child to follow the child of fork/vfork
Stacktraces
- Stacktrace of all threads -- thread apply all bt
