[ltt-dev] Question about instruction pointer and address attributes

[Francis Giraldeau]

Hi,

I want to relate trace events to source code. For testing, I did a  
small C program that does a file access. In the event  
kernel.syscall_entry sys_access, I got the instruction pointer  
ip=0x7fa4fba26ee7. I dumped the process memory map from  
/proc/$PID/maps, and this address doesn't fit in the process memory  
space. It's somewhat close to libc addresses, that are in the range of  
0x7f6471f56000-0x7f64724fc000.

Another example, inside a TRAP, I got two addresses,  
ip=0xffffffff812c722b and address=0x7fa4fba2cbc0, those two addresses  
doesn't map in the process space.

First, what is the difference between ip and address attribute? And  
wow does the ip can be converted back to the process address space?

Cheer,

Francis