[PATCH] Kprobes IA64: cmp ctype unc support

The current Kprobes when patching the original instruction with the break
instruction tries to retain the original qualifying predicate(qp), however
for cmp.crel.ctype where ctype == unc, which is a special instruction
always needs to be executed irrespective of qp.  Hence, if the instruction
we are patching is of this type, then we should not copy the original qp to
the break instruction, this is because we always want the break fault to
happen so that we can emulate the instruction.

This patch is based on the feedback given by David Mosberger

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 41 insertions, 2 deletions

diff --git a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
index 5d5344681555..51bc08bd0466 100644
--- a/arch/ia64/kernel/kprobes.c
+++ b/arch/ia64/kernel/kprobes.c
@@ -120,6 +120,41 @@ static void update_kprobe_inst_flag(uint template, uint  slot, uint major_opcode
 }
 
 /*
+ * In this function we check to see if the instruction
+ * (qp) cmpx.crel.ctype p1,p2=r2,r3
+ * on which we are inserting kprobe is cmp instruction
+ * with ctype as unc.
+ */
+static uint is_cmp_ctype_unc_inst(uint template, uint slot, uint major_opcode,
+unsigned long kprobe_inst)
+{
+        cmp_inst_t cmp_inst;
+        uint ctype_unc = 0;
+
+        if (!((bundle_encoding[template][slot] == I) ||
+                (bundle_encoding[template][slot] == M)))
+                goto out;
+
+        if (!((major_opcode == 0xC) || (major_opcode == 0xD) ||
+                (major_opcode == 0xE)))
+                goto out;
+
+        cmp_inst.l = kprobe_inst;
+        if ((cmp_inst.f.x2 == 0) || (cmp_inst.f.x2 == 1)) {
+                /* Integere compare - Register Register (A6 type)*/
+                if ((cmp_inst.f.tb == 0) && (cmp_inst.f.ta == 0)
+                                &&(cmp_inst.f.c == 1))
+                        ctype_unc = 1;
+        } else if ((cmp_inst.f.x2 == 2)||(cmp_inst.f.x2 == 3)) {
+                /* Integere compare - Immediate Register (A8 type)*/
+                if ((cmp_inst.f.ta == 0) &&(cmp_inst.f.c == 1))
+                        ctype_unc = 1;
+        }
+out:
+        return ctype_unc;
+}
+
+/*
  * In this function we override the bundle with
  * the break instruction at the given slot.
  */
@@ -131,9 +166,13 @@ static void prepare_break_inst(uint template, uint  slot, uint major_opcode,
 
         /*
          * Copy the original kprobe_inst qualifying predicate(qp)
-         * to the break instruction
+         * to the break instruction iff !is_cmp_ctype_unc_inst
+         * because for cmp instruction with ctype equal to unc,
+         * which is a special instruction always needs to be
+         * executed regradless of qp
          */
-        break_inst |= (0x3f & kprobe_inst);
+        if (!is_cmp_ctype_unc_inst(template, slot, major_opcode, kprobe_inst))
+                break_inst |= (0x3f & kprobe_inst);
 
         switch (slot) {
           case 0: