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tracing/probes: Split [ku]probes_fetch_type_table

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Use separate fetch_type_table for kprobes and uprobes.  It currently
shares all fetch methods but some of them will be implemented
differently later.

This is not to break build if [ku]probes is configured alone (like
!CONFIG_KPROBE_EVENT and CONFIG_UPROBE_EVENT).  So I added '__weak'
to the table declaration so that it can be safely omitted when it
configured out.

Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: 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 14:56:28 +09:00 committed by Steven Rostedt
parent b26c74e116
commit 34fee3a104
4 changed files with 119 additions and 39 deletions
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20
kernel/trace/trace_kprobe.c
View file

@ -88,6 +88,26 @@ static int kprobe_dispatcher(struct kprobe *kp, struct pt_regs *regs);
static int kretprobe_dispatcher(struct kretprobe_instance *ri,
struct pt_regs *regs);
/* Fetch type information table */
const struct fetch_type kprobes_fetch_type_table[] = {
/* Special types */
[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
sizeof(u32), 1, "__data_loc char[]"),
[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
string_size, sizeof(u32), 0, "u32"),
/* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
ASSIGN_FETCH_TYPE(u16, u16, 0),
ASSIGN_FETCH_TYPE(u32, u32, 0),
ASSIGN_FETCH_TYPE(u64, u64, 0),
ASSIGN_FETCH_TYPE(s8, u8, 1),
ASSIGN_FETCH_TYPE(s16, u16, 1),
ASSIGN_FETCH_TYPE(s32, u32, 1),
ASSIGN_FETCH_TYPE(s64, u64, 1),
ASSIGN_FETCH_TYPE_END
};
/*
* Allocate new trace_probe and initialize it (including kprobes).
*/

65
kernel/trace/trace_probe.c
View file

@ -54,10 +54,6 @@ DEFINE_BASIC_PRINT_TYPE_FUNC(s16, "%d")
DEFINE_BASIC_PRINT_TYPE_FUNC(s32, "%d")
DEFINE_BASIC_PRINT_TYPE_FUNC(s64, "%Ld")
/* For defining macros, define string/string_size types */
typedef u32 string;
typedef u32 string_size;
/* Print type function for string type */
__kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
const char *name,
@ -74,7 +70,6 @@ __kprobes int PRINT_TYPE_FUNC_NAME(string)(struct trace_seq *s,
const char PRINT_TYPE_FMT_NAME(string)[] = "\\\"%s\\\"";
#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
/*
* Define macro for basic types - we don't need to define s* types, because
* we have to care only about bitwidth at recording time.
@ -359,25 +354,8 @@ free_bitfield_fetch_param(struct bitfield_fetch_param *data)
kfree(data);
}
/* Fetch type information table */
static const struct fetch_type fetch_type_table[] = {
/* Special types */
[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
sizeof(u32), 1, "__data_loc char[]"),
[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
string_size, sizeof(u32), 0, "u32"),
/* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
ASSIGN_FETCH_TYPE(u16, u16, 0),
ASSIGN_FETCH_TYPE(u32, u32, 0),
ASSIGN_FETCH_TYPE(u64, u64, 0),
ASSIGN_FETCH_TYPE(s8, u8, 1),
ASSIGN_FETCH_TYPE(s16, u16, 1),
ASSIGN_FETCH_TYPE(s32, u32, 1),
ASSIGN_FETCH_TYPE(s64, u64, 1),
};
static const struct fetch_type *find_fetch_type(const char *type)
static const struct fetch_type *find_fetch_type(const char *type,
const struct fetch_type *ftbl)
{
int i;
@ -398,21 +376,22 @@ static const struct fetch_type *find_fetch_type(const char *type)
switch (bs) {
case 8:
return find_fetch_type("u8");
return find_fetch_type("u8", ftbl);
case 16:
return find_fetch_type("u16");
return find_fetch_type("u16", ftbl);
case 32:
return find_fetch_type("u32");
return find_fetch_type("u32", ftbl);
case 64:
return find_fetch_type("u64");
return find_fetch_type("u64", ftbl);
default:
goto fail;
}
}
for (i = 0; i < ARRAY_SIZE(fetch_type_table); i++)
if (strcmp(type, fetch_type_table[i].name) == 0)
return &fetch_type_table[i];
for (i = 0; ftbl[i].name; i++) {
if (strcmp(type, ftbl[i].name) == 0)
return &ftbl[i];
}
fail:
return NULL;
@ -426,16 +405,17 @@ static __kprobes void fetch_stack_address(struct pt_regs *regs,
}
static fetch_func_t get_fetch_size_function(const struct fetch_type *type,
fetch_func_t orig_fn)
fetch_func_t orig_fn,
const struct fetch_type *ftbl)
{
int i;
if (type != &fetch_type_table[FETCH_TYPE_STRING])
if (type != &ftbl[FETCH_TYPE_STRING])
return NULL; /* Only string type needs size function */
for (i = 0; i < FETCH_MTD_END; i++)
if (type->fetch[i] == orig_fn)
return fetch_type_table[FETCH_TYPE_STRSIZE].fetch[i];
return ftbl[FETCH_TYPE_STRSIZE].fetch[i];
WARN_ON(1); /* This should not happen */
@ -504,12 +484,14 @@ static int parse_probe_vars(char *arg, const struct fetch_type *t,
static int parse_probe_arg(char *arg, const struct fetch_type *t,
struct fetch_param *f, bool is_return, bool is_kprobe)
{
const struct fetch_type *ftbl;
unsigned long param;
long offset;
char *tmp;
int ret;
int ret = 0;
ret = 0;
ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
BUG_ON(ftbl == NULL);
/* Until uprobe_events supports only reg arguments */
if (!is_kprobe && arg[0] != '%')
@ -568,7 +550,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
struct deref_fetch_param *dprm;
const struct fetch_type *t2;
t2 = find_fetch_type(NULL);
t2 = find_fetch_type(NULL, ftbl);
*tmp = '\0';
dprm = kzalloc(sizeof(struct deref_fetch_param), GFP_KERNEL);
@ -637,9 +619,13 @@ static int __parse_bitfield_probe_arg(const char *bf,
int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
struct probe_arg *parg, bool is_return, bool is_kprobe)
{
const struct fetch_type *ftbl;
const char *t;
int ret;
ftbl = is_kprobe ? kprobes_fetch_type_table : uprobes_fetch_type_table;
BUG_ON(ftbl == NULL);
if (strlen(arg) > MAX_ARGSTR_LEN) {
pr_info("Argument is too long.: %s\n", arg);
return -ENOSPC;
@ -654,7 +640,7 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
arg[t - parg->comm] = '\0';
t++;
}
parg->type = find_fetch_type(t);
parg->type = find_fetch_type(t, ftbl);
if (!parg->type) {
pr_info("Unsupported type: %s\n", t);
return -EINVAL;
@ -668,7 +654,8 @@ int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
if (ret >= 0) {
parg->fetch_size.fn = get_fetch_size_function(parg->type,
parg->fetch.fn);
parg->fetch.fn,
ftbl);
parg->fetch_size.data = parg->fetch.data;
}

53
kernel/trace/trace_probe.h
View file

@ -126,6 +126,10 @@ struct fetch_param {
void *data;
};
/* For defining macros, define string/string_size types */
typedef u32 string;
typedef u32 string_size;
#define PRINT_TYPE_FUNC_NAME(type) print_type_##type
#define PRINT_TYPE_FMT_NAME(type) print_type_format_##type
@ -146,6 +150,47 @@ DECLARE_BASIC_PRINT_TYPE_FUNC(s32);
DECLARE_BASIC_PRINT_TYPE_FUNC(s64);
DECLARE_BASIC_PRINT_TYPE_FUNC(string);
#define FETCH_FUNC_NAME(method, type) fetch_##method##_##type
/* Declare macro for basic types */
#define DECLARE_FETCH_FUNC(method, type) \
extern void FETCH_FUNC_NAME(method, type)(struct pt_regs *regs, \
void *data, void *dest)
#define DECLARE_BASIC_FETCH_FUNCS(method) \
DECLARE_FETCH_FUNC(method, u8); \
DECLARE_FETCH_FUNC(method, u16); \
DECLARE_FETCH_FUNC(method, u32); \
DECLARE_FETCH_FUNC(method, u64)
DECLARE_BASIC_FETCH_FUNCS(reg);
#define fetch_reg_string NULL
#define fetch_reg_string_size NULL
DECLARE_BASIC_FETCH_FUNCS(stack);
#define fetch_stack_string NULL
#define fetch_stack_string_size NULL
DECLARE_BASIC_FETCH_FUNCS(retval);
#define fetch_retval_string NULL
#define fetch_retval_string_size NULL
DECLARE_BASIC_FETCH_FUNCS(memory);
DECLARE_FETCH_FUNC(memory, string);
DECLARE_FETCH_FUNC(memory, string_size);
DECLARE_BASIC_FETCH_FUNCS(symbol);
DECLARE_FETCH_FUNC(symbol, string);
DECLARE_FETCH_FUNC(symbol, string_size);
DECLARE_BASIC_FETCH_FUNCS(deref);
DECLARE_FETCH_FUNC(deref, string);
DECLARE_FETCH_FUNC(deref, string_size);
DECLARE_BASIC_FETCH_FUNCS(bitfield);
#define fetch_bitfield_string NULL
#define fetch_bitfield_string_size NULL
/* Default (unsigned long) fetch type */
#define __DEFAULT_FETCH_TYPE(t) u##t
#define _DEFAULT_FETCH_TYPE(t) __DEFAULT_FETCH_TYPE(t)
@ -176,9 +221,17 @@ ASSIGN_FETCH_FUNC(bitfield, ftype), \
#define ASSIGN_FETCH_TYPE(ptype, ftype, sign) \
__ASSIGN_FETCH_TYPE(#ptype, ptype, ftype, sizeof(ftype), sign, #ptype)
#define ASSIGN_FETCH_TYPE_END {}
#define FETCH_TYPE_STRING 0
#define FETCH_TYPE_STRSIZE 1
/*
* Fetch type information table.
* It's declared as a weak symbol due to conditional compilation.
*/
extern __weak const struct fetch_type kprobes_fetch_type_table[];
extern __weak const struct fetch_type uprobes_fetch_type_table[];
struct probe_arg {
struct fetch_param fetch;

20
kernel/trace/trace_uprobe.c
View file

@ -74,6 +74,26 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs);
static int uretprobe_dispatcher(struct uprobe_consumer *con,
unsigned long func, struct pt_regs *regs);
/* Fetch type information table */
const struct fetch_type uprobes_fetch_type_table[] = {
/* Special types */
[FETCH_TYPE_STRING] = __ASSIGN_FETCH_TYPE("string", string, string,
sizeof(u32), 1, "__data_loc char[]"),
[FETCH_TYPE_STRSIZE] = __ASSIGN_FETCH_TYPE("string_size", u32,
string_size, sizeof(u32), 0, "u32"),
/* Basic types */
ASSIGN_FETCH_TYPE(u8, u8, 0),
ASSIGN_FETCH_TYPE(u16, u16, 0),
ASSIGN_FETCH_TYPE(u32, u32, 0),
ASSIGN_FETCH_TYPE(u64, u64, 0),
ASSIGN_FETCH_TYPE(s8, u8, 1),
ASSIGN_FETCH_TYPE(s16, u16, 1),
ASSIGN_FETCH_TYPE(s32, u32, 1),
ASSIGN_FETCH_TYPE(s64, u64, 1),
ASSIGN_FETCH_TYPE_END
};
static inline void init_trace_uprobe_filter(struct trace_uprobe_filter *filter)
{
rwlock_init(&filter->rwlock);