On Tue, 06 Aug 2013, nidhi mittal hada wrote: > ---------- Forwarded message ---------- > From: nidhi mittal hada <nidhimittal19@xxxxxxxxx> > Date: Tue, Aug 6, 2013 at 2:16 PM > Subject: Understanding disassembly x86 + understanding function call + > parameter pass and stack frame > To: Kernelnewbies <kernelnewbies@xxxxxxxxxxxx> > Cc: Mulyadi Santosa <mulyadi.santosa@xxxxxxxxx> > > > Hi All, > > I am using crash tool to analyze core dump obtained from red hat linux on > x86_64 platform. > > And crash tool gives a stack trace of panic. > But its does not show function parameters which were passed in this stack > trace. > > So i have to disassemble and understand the value of parameters passed to > these functions, while it panicked. > Which i am not able to understand much. > > I would request help in knowing, how to understand disassembled function > call , on x86_64 arch. > > Putting some of the doubts.. > > a)like which sequence the parameters, return address, etc are pushed on > stack? Not necessarily on the stack. The AMD64 ABI [0] should help you here. However, without knowledge of assembly I doubt you can achieve very much. > b)Which registers are used, if some registers play some spl. role ? You'll see in [0]. > c)lets say for a program a.c i use gcc -S a.c ...do we have some other > command to generate > somewhat more clear assembly code, may be with some comments in english > Never heard of such a thing. Actually without optimisation, the generated assembly code from gcc (from all I have seen and remember) is very clear - sometimes a little bit clumsy, but clear. You should in fact practice with something like -O2 if you are about to disassemble kernel functions... > Any kind of help in understanding this will be appreciated .. Regards, Tobi [0] http://www.uclibc.org/docs/psABI-x86_64.pdf _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
