[PATCH v2 3/4] uprobes/powerpc: teach uprobes to ignore gdb breakpoints
Ananth N Mavinakayanahalli
ananth at in.ibm.com
Sat Mar 23 02:18:38 EST 2013
From: Ananth N Mavinakayanahalli <ananth at 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 <ananth at in.ibm.com>
arch/powerpc/kernel/uprobes.c | 10 ++++++++++
1 file changed, 10 insertions(+)
@@ -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));
* @mm: the probed address space.
* @arch_uprobe: the probepoint information.
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