Commit-ID: ab07e807be533d6317ea0971900bdf547962effd
Gitweb: http://git.kernel.org/tip/ab07e807be533d6317ea0971900bdf547962effd
Author: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
AuthorDate: Fri, 22 Mar 2013 20:48:38 +0530
Committer: Oleg Nesterov <oleg@xxxxxxxxxx>
CommitDate: Thu, 4 Apr 2013 13:57:04 +0200
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@xxxxxxxxxx>
Acked-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
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.
--
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