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authorAnanth N Mavinakayanahalli <ananth@in.ibm.com>2013-03-22 20:48:38 +0530
committerOleg Nesterov <oleg@redhat.com>2013-04-04 13:57:04 +0200
commitab07e807be533d6317ea0971900bdf547962effd (patch)
treedf6362115a358a9e198e934b4e0bcd98a30265f9 /arch/powerpc
parent0908ad6e56b5a6e86745680bc324bdbfac64d0b6 (diff)
downloadlinux-ab07e807be533d6317ea0971900bdf547962effd.tar.gz
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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/uprobes.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/uprobes.c b/arch/powerpc/kernel/uprobes.c
index bc77834dbf4..cb7f63da140 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.