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[POWERPC] Transparently handle <.symbol> lookup for kprobes 

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,
====================
[root@llm27lp1 ~]# 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.  This fixes the problem.

Signed-off-by: Srinivasa Ds <srinivasa@in.ibm.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Srinivasa Ds 2007-04-23 11:28:49 +05:30 committed by Paul Mackerras
parent 14d1d2f25b
commit eb609e52d1
1 changed files with 6 additions and 0 deletions
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6
include/asm-powerpc/kprobes.h
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@ -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); \
} \
}