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

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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); \
} \
}