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tracing/probes: Move 'symbol' fetch method to kprobes

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Move existing functions to trace_kprobe.c and add NULL entries to the
uprobes fetch type table.  I don't make them static since some generic
routines like update/free_XXX_fetch_param() require pointers to the
functions.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: zhangwei(Jovi) <jovi.zhangwei@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Namhyung Kim 2013-11-26 15:21:04 +09:00 committed by Steven Rostedt
parent 3fd996a295
commit 1301a44e77
4 changed files with 91 additions and 59 deletions
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59
kernel/trace/trace_kprobe.c
View File

@ -88,6 +88,51 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_dispatcher(struct kretprobe_instance *ri,
struct pt_regs *regs);
/* Memory fetching by symbol */
struct symbol_cache {
char *symbol;
long offset;
unsigned long addr;
};
unsigned long update_symbol_cache(struct symbol_cache *sc)
{
sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
if (sc->addr)
sc->addr += sc->offset;
return sc->addr;
}
void free_symbol_cache(struct symbol_cache *sc)
{
kfree(sc->symbol);
kfree(sc);
}
struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
{
struct symbol_cache *sc;
if (!sym || strlen(sym) == 0)
return NULL;
sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
if (!sc)
return NULL;
sc->symbol = kstrdup(sym, GFP_KERNEL);
if (!sc->symbol) {
kfree(sc);
return NULL;
}
sc->offset = offset;
update_symbol_cache(sc);
return sc;
}
/*
* Kprobes-specific fetch functions
*/
@ -103,6 +148,20 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
#define fetch_stack_string NULL
#define fetch_stack_string_size NULL
#define DEFINE_FETCH_symbol(type) \
__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \
void *data, void *dest) \
{ \
struct symbol_cache *sc = data; \
if (sc->addr) \
fetch_memory_##type(regs, (void *)sc->addr, dest); \
else \
*(type *)dest = 0; \
}
DEFINE_BASIC_FETCH_FUNCS(symbol)
DEFINE_FETCH_symbol(string)
DEFINE_FETCH_symbol(string_size)
/* Fetch type information table */
const struct fetch_type kprobes_fetch_type_table[] = {
/* Special types */

59
kernel/trace/trace_probe.c
View File

@ -180,65 +180,6 @@ __kprobes void FETCH_FUNC_NAME(memory, string_size)(struct pt_regs *regs,
*(u32 *)dest = len;
}
/* Memory fetching by symbol */
struct symbol_cache {
char *symbol;
long offset;
unsigned long addr;
};
static unsigned long update_symbol_cache(struct symbol_cache *sc)
{
sc->addr = (unsigned long)kallsyms_lookup_name(sc->symbol);
if (sc->addr)
sc->addr += sc->offset;
return sc->addr;
}
static void free_symbol_cache(struct symbol_cache *sc)
{
kfree(sc->symbol);
kfree(sc);
}
static struct symbol_cache *alloc_symbol_cache(const char *sym, long offset)
{
struct symbol_cache *sc;
if (!sym || strlen(sym) == 0)
return NULL;
sc = kzalloc(sizeof(struct symbol_cache), GFP_KERNEL);
if (!sc)
return NULL;
sc->symbol = kstrdup(sym, GFP_KERNEL);
if (!sc->symbol) {
kfree(sc);
return NULL;
}
sc->offset = offset;
update_symbol_cache(sc);
return sc;
}
#define DEFINE_FETCH_symbol(type) \
__kprobes void FETCH_FUNC_NAME(symbol, type)(struct pt_regs *regs, \
void *data, void *dest) \
{ \
struct symbol_cache *sc = data; \
if (sc->addr) \
fetch_memory_##type(regs, (void *)sc->addr, dest); \
else \
*(type *)dest = 0; \
}
DEFINE_BASIC_FETCH_FUNCS(symbol)
DEFINE_FETCH_symbol(string)
DEFINE_FETCH_symbol(string_size)
/* Dereference memory access function */
struct deref_fetch_param {
struct fetch_param orig;

24
kernel/trace/trace_probe.h
View File

@ -239,6 +239,30 @@ ASSIGN_FETCH_FUNC(bitfield, ftype), \
extern __weak const struct fetch_type kprobes_fetch_type_table[];
extern __weak const struct fetch_type uprobes_fetch_type_table[];
#ifdef CONFIG_KPROBE_EVENT
struct symbol_cache;
unsigned long update_symbol_cache(struct symbol_cache *sc);
void free_symbol_cache(struct symbol_cache *sc);
struct symbol_cache *alloc_symbol_cache(const char *sym, long offset);
#else
struct symbol_cache {
};
static inline unsigned long __used update_symbol_cache(struct symbol_cache *sc)
{
return 0;
}
static inline void __used free_symbol_cache(struct symbol_cache *sc)
{
}
static inline struct symbol_cache * __used
alloc_symbol_cache(const char *sym, long offset)
{
return NULL;
}
#endif /* CONFIG_KPROBE_EVENT */
struct probe_arg {
struct fetch_param fetch;
struct fetch_param fetch_size;

8
kernel/trace/trace_uprobe.c
View File

@ -115,6 +115,14 @@ DEFINE_BASIC_FETCH_FUNCS(stack)
#define fetch_stack_string_size NULL
/* uprobes do not support symbol fetch methods */
#define fetch_symbol_u8 NULL
#define fetch_symbol_u16 NULL
#define fetch_symbol_u32 NULL
#define fetch_symbol_u64 NULL
#define fetch_symbol_string NULL
#define fetch_symbol_string_size NULL
/* Fetch type information table */
const struct fetch_type uprobes_fetch_type_table[] = {
/* Special types */