Fun with strace and the GDB Debugger

Hi, Can you can tell me the GDB command to do following: 1. Read a register 2. Read a memory location 3. Write a register 4. Write a memory location

It would so nice if you could help me!

thanks, mudassir.

Hi,

I got the answer of how to read/write registers. i am writing it here for anyone else's use. it is as follows

to read: gdb> print $ e.g: gdb> print $PC

and to write gdb> print $= e.g: gdb> print $PC=0x01000ffc4

And to read write memory contents:

to read: gdb> print (*(int*)) e.g: gdb> print (*(int*)0x01000ffc4)

and to write

gdb> print (*(int*))= e.g: gdb> print (*(int*)0x01000ffc4=0x01014433 Note: memory region should be readable/writable for the purpose ofcourse!

But i am still interesting in knowing, how to read a chunk of memory say 100 bytes. I should specify a range with address somewhere.

thanks, mudassir shabbir.

hi, I developed a shared libarary as the end result of a c++ project.Now I need to detect the memory leaks in that shared library using valgrind.Pls anybody tell me how to do this.when I try to check the memory leaks in the source file itself I get a permission defined message(yer I tried as the root too, but again permission defined) why is this ? Thanks -rajika