From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: Rashmica Gupta <rashmicy@gmail.com>, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] powerpc: Add rN aliases to the pt_regs_offset table.
Date: Mon, 23 Nov 2015 13:54:34 +0530 [thread overview]
Message-ID: <5652CD42.5010008@linux.vnet.ibm.com> (raw)
In-Reply-To: <1448086096-3117-1-git-send-email-rashmicy@gmail.com>
On 11/21/2015 11:38 AM, Rashmica Gupta wrote:
> It is common practice with powerpc to use 'rN' to refer to register 'N'. However
> when using the pt_regs_offset table we have to use 'gprN'.
>
> So add aliases such that both 'rN' and 'gprN' can be used.
>
> For example, we can currently do:
> $ su -
> $ echo "p:probe/sys_fchownat .sys_fchownat %gpr3:s32 +0(%gpr4):string %gpr5:s32
> %gpr6:s32 %gpr7:s32" > /sys/kernel/debug/tracing/kprobe_events
> $ echo 1 > /sys/kernel/debug/tracing/events/probe/sys_fchownat/enable
> $ touch /tmp/foo
> $ chown root /tmp/foo
> $ echo 0 > /sys/kernel/debug/tracing/events/enable
> $ cat /sys/kernel/debug/tracing/trace
> chown-5040 [001] d... 24800.047211: sys_fchownat:
> (.SyS_fchownat+0x0/0x190) arg1=-100 arg2="foo" arg3=0 arg4=-1 arg5=0
>
> Instead we'd like to be able to use:
> $ echo "p:probe/sys_fchownat sys_fchownat %r3:s32 +0(%r4):string %r5:s32
> %r6:s32 %r7:s32" > /sys/kernel/debug/tracing/kprobe_events
This makes sense and works for me on a LE guest. Just that the symbol
should not have the "." before it.
next prev parent reply other threads:[~2015-11-23 8:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-21 6:08 [PATCH] powerpc: Add rN aliases to the pt_regs_offset table Rashmica Gupta
2015-11-23 8:24 ` Anshuman Khandual [this message]
2015-11-23 10:15 ` Michael Ellerman
2015-11-26 12:15 ` Michael Ellerman
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