Dave, On Fri, Sep 21, 2012 at 9:44 PM, Dave Anderson <[email protected]> wrote:
> > > ----- Original Message ----- > > > > Hi Dave, > > > > > > I notice there was some discussion around on enabling > > the display function parameters feature for crash tool. > > Like this one: > > http://www.redhat.com/archives/crash-utility/2009-May/msg00016.html > > Yes, it seems to come up every few years. People have tried, but it > has never come to fruition. > > > > > Although the answer seems to be quite clear, it should be hard to > > support such feature. But does this feature cannot be done anyway? > > I think this feature would be great in assisting kernel debug. > > > > The main feature I require, first should be know each param's value > > in the call stack. > > Then it is better to know each call stack's param's name. > > > > Like for do_vfs_ioctl function, it is better to display as: > > do_vfs_ioctl(filp=xxx, fd=xxx, cmd=xxx, arg=xxx) > > > > Do you have any idea on how this could be implemented? > > No I don't. > Sorry for asking the stupid question, but I notice that we could get the structure member in crash by "struct" command: crash> struct stackframe struct stackframe { long unsigned int fp; long unsigned int sp; long unsigned int lr; long unsigned int pc; } SIZE: 16 I check the crash code, and find cmd_struct use gdb interface to parse it out. And the gdb itself seems already could parse out function argument[1], so could we still use similar mechanism as the "struct" command to implement a "func" command, which could shows the function declaration? Reference: [1] http://www.chemie.fu-berlin.de/chemnet/use/info/gdb/gdb_7.html GDB could shows the function param string and corresponding value #0 m4_traceon (obs=0x24eb0, argc=1, argv=0x2b8c8) at builtin.c:993 #1 0x6e38 in expand_macro (sym=0x2b600) at macro.c:242 #2 0x6840 in expand_token (obs=0x0, t=177664, td=0xf7fffb08) at macro.c:71 (More stack frames follow...) Thanks, Lei
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