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tracing/kprobes: Move common functions to trace_probe.h

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The __get_data_size() and store_trace_args() will be used by uprobes
too.  Move them to a common location.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Acked-by: Oleg Nesterov <oleg@redhat.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 2013-07-03 15:55:36 +09:00 committed by Steven Rostedt
parent 14577c3992
commit 2dc1018372
2 changed files with 48 additions and 48 deletions
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48
kernel/trace/trace_kprobe.c
View File

@ -740,54 +740,6 @@ static const struct file_operations kprobe_profile_ops = {
.release = seq_release,
};
/* Sum up total data length for dynamic arraies (strings) */
static __kprobes int __get_data_size(struct trace_probe *tp,
struct pt_regs *regs)
{
int i, ret = 0;
u32 len;
for (i = 0; i < tp->nr_args; i++)
if (unlikely(tp->args[i].fetch_size.fn)) {
call_fetch(&tp->args[i].fetch_size, regs, &len);
ret += len;
}
return ret;
}
/* Store the value of each argument */
static __kprobes void store_trace_args(int ent_size, struct trace_probe *tp,
struct pt_regs *regs,
u8 *data, int maxlen)
{
int i;
u32 end = tp->size;
u32 *dl; /* Data (relative) location */
for (i = 0; i < tp->nr_args; i++) {
if (unlikely(tp->args[i].fetch_size.fn)) {
/*
* First, we set the relative location and
* maximum data length to *dl
*/
dl = (u32 *)(data + tp->args[i].offset);
*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
/* Then try to fetch string or dynamic array data */
call_fetch(&tp->args[i].fetch, regs, dl);
/* Reduce maximum length */
end += get_rloc_len(*dl);
maxlen -= get_rloc_len(*dl);
/* Trick here, convert data_rloc to data_loc */
*dl = convert_rloc_to_loc(*dl,
ent_size + tp->args[i].offset);
} else
/* Just fetching data normally */
call_fetch(&tp->args[i].fetch, regs,
data + tp->args[i].offset);
}
}
/* Kprobe handler */
static __kprobes void
__kprobe_trace_func(struct trace_kprobe *tk, struct pt_regs *regs,

48
kernel/trace/trace_probe.h
View File

@ -178,3 +178,51 @@ extern ssize_t traceprobe_probes_write(struct file *file,
int (*createfn)(int, char**));
extern int traceprobe_command(const char *buf, int (*createfn)(int, char**));
/* Sum up total data length for dynamic arraies (strings) */
static inline __kprobes int
__get_data_size(struct trace_probe *tp, struct pt_regs *regs)
{
int i, ret = 0;
u32 len;
for (i = 0; i < tp->nr_args; i++)
if (unlikely(tp->args[i].fetch_size.fn)) {
call_fetch(&tp->args[i].fetch_size, regs, &len);
ret += len;
}
return ret;
}
/* Store the value of each argument */
static inline __kprobes void
store_trace_args(int ent_size, struct trace_probe *tp, struct pt_regs *regs,
u8 *data, int maxlen)
{
int i;
u32 end = tp->size;
u32 *dl; /* Data (relative) location */
for (i = 0; i < tp->nr_args; i++) {
if (unlikely(tp->args[i].fetch_size.fn)) {
/*
* First, we set the relative location and
* maximum data length to *dl
*/
dl = (u32 *)(data + tp->args[i].offset);
*dl = make_data_rloc(maxlen, end - tp->args[i].offset);
/* Then try to fetch string or dynamic array data */
call_fetch(&tp->args[i].fetch, regs, dl);
/* Reduce maximum length */
end += get_rloc_len(*dl);
maxlen -= get_rloc_len(*dl);
/* Trick here, convert data_rloc to data_loc */
*dl = convert_rloc_to_loc(*dl,
ent_size + tp->args[i].offset);
} else
/* Just fetching data normally */
call_fetch(&tp->args[i].fetch, regs,
data + tp->args[i].offset);
}
}