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[PATCH] kprobes: handle symbol resolution when <module:.symbol> is specified

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kallsyms_lookup_name() allows for <module:symbol> style specification for
looking up symbol addresses.  Handle the case where the user specifies
<module:.symbol> on powerpc, given that 64-bit powerpc uses function
descriptors.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ananth N Mavinakayanahalli 2006-10-02 02:17:31 -07:00 committed by Linus Torvalds
parent 3a872d89ba
commit 412998cf6b
1 changed files with 11 additions and 4 deletions
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15
include/asm-powerpc/kprobes.h
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@ -47,16 +47,23 @@ typedef unsigned int kprobe_opcode_t;
/*
* 64bit powerpc uses function descriptors.
* Handle cases where:
* - User passes a <.symbol>
* - User passes a <symbol>
* - User passes a <.symbol> or <module:.symbol>
* - User passes a <symbol> or <module:symbol>
* - User passes a non-existant symbol, kallsyms_lookup_name
* returns 0. Don't deref the NULL pointer in that case
*/
#define kprobe_lookup_name(name, addr) \
{ \
addr = (kprobe_opcode_t *)kallsyms_lookup_name(name); \
if (!(name[0] == '.') && addr) \
addr = *(kprobe_opcode_t **)addr; \
if (addr) { \
char *colon; \
if ((colon = strchr(name, ':')) != NULL) { \
colon++; \
if (*colon != '\0' && *colon != '.') \
addr = *(kprobe_opcode_t **)addr; \
} else if (name[0] != '.') \
addr = *(kprobe_opcode_t **)addr; \
} \
}
#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)((func_descr_t *)pentry)