From ab07e807be533d6317ea0971900bdf547962effd Mon Sep 17 00:00:00 2001 From: Ananth N Mavinakayanahalli Date: Fri, 22 Mar 2013 20:48:38 +0530 Subject: [PATCH] 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 Acked-by: Srikar Dronamraju Signed-off-by: Oleg Nesterov --- arch/powerpc/kernel/uprobes.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c index bc77834..cb7f63d 100644 --- a/arch/powerpc/kernel/uprobes.c +++ b/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. -- 2.7.4