* Ananth N Mavinakayanahalli <ana...@in.ibm.com> [2013-03-22 20:48:38]:
> From: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
>
> Powerpc has many trap variants that could be used by entities like gdb.
> Currently, running gdb on a program being traced by uprobes causes an
> endless loop since uprobes doesn't understand that the trap was inserted
> by some other entity and a SIGTRAP needs to be delivered.
>
> Teach uprobes to ignore breakpoints that do not belong to it.
>
> Signed-off-by: Ananth N Mavinakayanahalli <ana...@in.ibm.com>
Acked-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
> ---
> arch/powerpc/kernel/uprobes.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> Index: linux-3.9-rc3/arch/powerpc/kernel/uprobes.c
> ===================================================================
> --- linux-3.9-rc3.orig/arch/powerpc/kernel/uprobes.c
> +++ linux-3.9-rc3/arch/powerpc/kernel/uprobes.c
> @@ -31,6 +31,16 @@
> #define UPROBE_TRAP_NR UINT_MAX
>
> /**
> + * is_trap_insn - check if the instruction is a trap variant
> + * @insn: instruction to be checked.
> + * Returns true if @insn is a trap variant.
> + */
> +bool is_trap_insn(uprobe_opcode_t *insn)
> +{
> + return (is_trap(*insn));
> +}
> +
> +/**
> * arch_uprobe_analyze_insn
> * @mm: the probed address space.
> * @arch_uprobe: the probepoint information.
--
Thanks and Regards
Srikar Dronamraju
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