On Tue, Sep 19, 2017 at 6:00 AM, Nayan Gadre <beejoy.na...@gmail.com> wrote:
> Hi,
>
> I am new to solaris dtrace debugging tool, but I have prior experience
> with Linux SystemTap.
>
> I need to debug my Solaris kernel module particularly extract the data
> in a structure passed by reference to my kernel function.
>
> msg_recv(struct sk_buff *skbp, uint_t link, uchar_t* src)
> {
> pkt_hdr_t *pkt;
> pkt = (pkt_hdr_t *)skbp->data;
> port = pkt->port;
> }
>
> I have written a systemtap script in linux to access the argument and
> extract data.
>
> How can I do this using DTRACE for solaris modules.
>
I'm assuming you're talking about a kernel module, and reading a pointer to
kernel memory. (But the other respondents on this thread seem to be
assuming otherwise, so maybe I've misunderstood). Here are a few examples:
dtrace -n 'msg_recv:entry{print(*args[0])}'
or if you want a specific member:
dtrace -n 'msg_recv:entry{printf("a=%u", args[0]->a)}'
Or if you need to cast a member as the code does:
dtrace -n 'msg_recv:entry{print(*((pkt_hdr_t*)args[0]->data))}'
--matt
>
> I tried looking into the system and trying few commands, but thats all
> i know about dtrace:
>
> [root@vcssx247-ldm7 ~]#dtrace -l | grep msg_recv
> 7090 fbt mymod msg_recv1 entry
> 7091 fbt mymod msg_recv1 return
> 7548 fbt mymod msg_recv entry
> 7549 fbt mymod msg_recv return
>
> Any pointers to correct, to the point documentation would be appreciated.
>
> Thanks
> Nayan
>
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