Commit ab07e807 authored Mar 22, 2013 by Ananth N Mavinakayanahalli Committed by Oleg Nesterov Apr 04, 2013

uprobes/powerpc: Teach uprobes to ignore gdb breakpoints

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 <ananth@in.ibm.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>

parent 0908ad6e

arch/powerpc/kernel/uprobes.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,16 @@

		#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.