Is there a way to test for whether we are on a breakpoint, using pure gdb scripting?

Question

I am attempting to use this answer to generate an instruction trace between two lines of code.

Unfortunately, the condition in the while loop is a simple count, and I need to keep running the loop until a particular line of code in the source code is reached.

Does there exists a way to check whether we are either on a particular line of code, or at a particular breakpoint, within a pure gdb script?

I am aware of the solution here which uses the Python API. I am also aware of pin-instat, but I want to know whether this can done with pure gdb.

What if 1) use info line or use disas /m to get information about addresses of the particular line of code and when 2) while $pc != ADDRESS | si | end ?. This way you will keep running the loop until a particular line of code in the source code is reached. — user184968
– user184968, Commented Jul 2, 2014 at 9:09

Community · Accepted Answer · 2017-05-23 12:29:27Z

1

What if do what you want in this way

1) Get information about pc for the line which you would like to reach

Use info line or use disas /m to get information about addresses of the particular line of code.

2) Write the similar loop as in Tracing/profiling instructions

 while $pc != ADDRESS-FROM-FIRST-STEP si end.

This way you will keep running the loop until a particular line of code in the source code is reached

edited May 23, 2017 at 12:29

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answered Jul 4, 2014 at 9:14

user184968

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2 Comments

merlin2011 Over a year ago

With ASLR, which is enabled on most systems, the address will change across runs. By the way, I had meant to respond to the comment but I lost track of it.

user184968 Over a year ago

1) You are running under gdb, aren't you? It is possible to disable randomization under gdb with set disable-randomization. 2) ASLR on Linux can have three possible values. On my computer its value is 2 and it seems that when I run a program addresses of functions are the same yet addresses of heap are different.

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