[Crash-utility] display function parameters for call stack

[Lei Wen]

Dave,

On Mon, Sep 24, 2012 at 9:55 PM, Dave Anderson <anderson at redhat.com> wrote:

>
>
> ----- Original Message -----
>
>
> > You can either use the "whatis" command to get the function
> > declaration:
> >
> > crash> help whatis
> >
> > NAME
> > whatis - search symbol table for data or type information
> >
> > SYNOPSIS
> > whatis [struct | union | typedef | symbol]
> >
> > DESCRIPTION
> > This command displays the definition of structures, unions, typedefs
> > or
> > text/data symbols.
> > ...
> >
> > crash> whatis do_vfs_ioctl
> > int do_vfs_ioctl(struct file *, unsigned int, unsigned int, long
> unsigned int);
> > crash>
> >
> > Or print it with "p", which gives you both the declaration and its
> > virtual address:
> >
> > crash> p do_vfs_ioctl
> > do_vfs_ioctl = $14 =
> > {int (struct file *, unsigned int, unsigned int, long unsigned int)}
>  0xffffffff811247ec <do_vfs_ioctl>
> > crash>
> >
> > That works. :)
> > However could it be possible to show the argument without only display
> its type?
> > The kernel is defining the do_vfs_ioctl as:
> >
> > int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
> unsigned long arg);
> > Could the "filp, fd, cmd, arg" be showed out?
>
> Anything from the output line could be selectively shown if you parse
> the gdb output with open_tmpfile() or open_tmpfile2() if necessary.
>
>
Do you mean if I want to display out something like:
int do_vfs_ioctl(struct file * filp, unsigned int fd, unsigned int cmd,
long unsigned int arg);
I need to use the tmpfile to pass "filp, fd, cmd, arg" to "whatis"?

But the reality is that I don't know how to let crash extract the four
parameter name,
then how could I pass this info to the tmpfile?

Also the interest of me is get the output as:
 do_vfs_ioctl(filp,  fd,  cmd,  arg);
The parameter's type may not need to be displayed as the whatis case.

Thanks,
Lei
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