[PATCH] Kprobes/IA64: support kprobe on branch/call instructions

This patch is required to support kprobe on branch/call instructions.

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, 16 insertions, 1 deletions

diff --git a/include/asm-ia64/kprobes.h b/include/asm-ia64/kprobes.h
index fec3506e53f8..d30af77a0b11 100644
--- a/include/asm-ia64/kprobes.h
+++ b/include/asm-ia64/kprobes.h
@@ -44,6 +44,17 @@ typedef struct _bundle {
 
 #define JPROBE_ENTRY(pentry)    (kprobe_opcode_t *)pentry
 
+#define SLOT0_OPCODE_SHIFT      (37)
+#define SLOT1_p1_OPCODE_SHIFT   (37 - (64-46))
+#define SLOT2_OPCODE_SHIFT      (37)
+
+#define INDIRECT_CALL_OPCODE            (1)
+#define IP_RELATIVE_CALL_OPCODE         (5)
+#define IP_RELATIVE_BRANCH_OPCODE       (4)
+#define IP_RELATIVE_PREDICT_OPCODE      (7)
+#define LONG_BRANCH_OPCODE              (0xC)
+#define LONG_CALL_OPCODE                (0xD)
+
 typedef struct kprobe_opcode {
         bundle_t bundle;
 } kprobe_opcode_t;
@@ -55,8 +66,12 @@ struct fnptr {
 
 /* Architecture specific copy of original instruction*/
 struct arch_specific_insn {
-        /* copy of the original instruction */
+        /* copy of the instruction to be emulated */
         kprobe_opcode_t insn;
+ #define INST_FLAG_FIX_RELATIVE_IP_ADDR         1
+ #define INST_FLAG_FIX_BRANCH_REG               2
+        unsigned long inst_flag;
+        unsigned short target_br_reg;
 };
 
 /* ia64 does not need this */