When data symbols are not present in kernel image, user needs to add
dot(".") before function name explicitly, that he wants to probe in kprobe
module on ppc64.
for ex:-
When data symbols are missing on ppc64,
====================
[EMAIL PROTECTED] ~]# cat /proc/kallsyms | grep do_fork
c00000000006283c T .do_fork
==============================
User needs add "." to "do_fork"
kp.symbol_name = ".do_fork";
============================
This makes kprobe modules unportable. Below patch fixes the problem.
Signed-off-by: Srinivasa Ds <[EMAIL PROTECTED]>
Signed-off-by: Ananth N Mavinakayanahalli <[EMAIL PROTECTED]>
---
include/asm-powerpc/kprobes.h | 6 ++++++
1 file changed, 6 insertions(+)
Index: linux-2.6.21-rc7/include/asm-powerpc/kprobes.h
===================================================================
--- linux-2.6.21-rc7.orig/include/asm-powerpc/kprobes.h
+++ linux-2.6.21-rc7/include/asm-powerpc/kprobes.h
@@ -64,6 +64,12 @@ typedef unsigned int kprobe_opcode_t;
addr = *(kprobe_opcode_t **)addr; \
} else if (name[0] != '.') \
addr = *(kprobe_opcode_t **)addr; \
+ } else { \
+ char dot_name[KSYM_NAME_LEN+1]; \
+ dot_name[0] = '.'; \
+ dot_name[1] = '\0'; \
+ strncat(dot_name, name, KSYM_NAME_LEN); \
+ addr = (kprobe_opcode_t *)kallsyms_lookup_name(dot_name); \
} \
}
