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tracing: Integrate similar probe argument parsers 

Integrate similar argument parsers for kprobes and uprobes events
into traceprobe_parse_probe_arg().

Link: http://lkml.kernel.org/r/154140850016.17322.9836787731210512176.stgit@devbox

Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2018-11-05 18:01:40 +09:00 committed by Steven Rostedt (VMware)
parent faacb361f2
commit d00bbea945
4 changed files with 50 additions and 96 deletions
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48
kernel/trace/trace_kprobe.c
View File

@ -548,7 +548,6 @@ static int create_trace_kprobe(int argc, char **argv)
bool is_return = false, is_delete = false;
char *symbol = NULL, *event = NULL, *group = NULL;
int maxactive = 0;
char *arg;
long offset = 0;
void *addr = NULL;
char buf[MAX_EVENT_NAME_LEN];
@ -676,53 +675,10 @@ static int create_trace_kprobe(int argc, char **argv)
}
/* parse arguments */
ret = 0;
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
struct probe_arg *parg = &tk->tp.args[i];
/* Increment count for freeing args in error case */
tk->tp.nr_args++;
/* Parse argument name */
arg = strchr(argv[i], '=');
if (arg) {
*arg++ = '\0';
parg->name = kstrdup(argv[i], GFP_KERNEL);
} else {
arg = argv[i];
/* If argument name is omitted, set "argN" */
snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
parg->name = kstrdup(buf, GFP_KERNEL);
}
if (!parg->name) {
pr_info("Failed to allocate argument[%d] name.\n", i);
ret = -ENOMEM;
ret = traceprobe_parse_probe_arg(&tk->tp, i, argv[i], flags);
if (ret)
goto error;
}
if (!is_good_name(parg->name)) {
pr_info("Invalid argument[%d] name: %s\n",
i, parg->name);
ret = -EINVAL;
goto error;
}
if (traceprobe_conflict_field_name(parg->name,
tk->tp.args, i)) {
pr_info("Argument[%d] name '%s' conflicts with "
"another field.\n", i, argv[i]);
ret = -EINVAL;
goto error;
}
/* Parse fetch argument */
ret = traceprobe_parse_probe_arg(arg, &tk->tp.size, parg,
flags);
if (ret) {
pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
goto error;
}
}
ret = register_trace_kprobe(tk);

47
kernel/trace/trace_probe.c
View File

@ -348,7 +348,7 @@ static int __parse_bitfield_probe_arg(const char *bf,
}
/* String length checking wrapper */
int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
static int traceprobe_parse_probe_arg_body(char *arg, ssize_t *size,
struct probe_arg *parg, unsigned int flags)
{
struct fetch_insn *code, *scode, *tmp = NULL;
@ -491,8 +491,8 @@ fail:
}
/* Return 1 if name is reserved or already used by another argument */
int traceprobe_conflict_field_name(const char *name,
struct probe_arg *args, int narg)
static int traceprobe_conflict_field_name(const char *name,
struct probe_arg *args, int narg)
{
int i;
@ -507,6 +507,47 @@ int traceprobe_conflict_field_name(const char *name,
return 0;
}
int traceprobe_parse_probe_arg(struct trace_probe *tp, int i, char *arg,
unsigned int flags)
{
struct probe_arg *parg = &tp->args[i];
char *body;
int ret;
/* Increment count for freeing args in error case */
tp->nr_args++;
body = strchr(arg, '=');
if (body) {
parg->name = kmemdup_nul(arg, body - arg, GFP_KERNEL);
body++;
} else {
/* If argument name is omitted, set "argN" */
parg->name = kasprintf(GFP_KERNEL, "arg%d", i + 1);
body = arg;
}
if (!parg->name)
return -ENOMEM;
if (!is_good_name(parg->name)) {
pr_info("Invalid argument[%d] name: %s\n",
i, parg->name);
return -EINVAL;
}
if (traceprobe_conflict_field_name(parg->name, tp->args, i)) {
pr_info("Argument[%d]: '%s' conflicts with another field.\n",
i, parg->name);
return -EINVAL;
}
/* Parse fetch argument */
ret = traceprobe_parse_probe_arg_body(body, &tp->size, parg, flags);
if (ret)
pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
return ret;
}
void traceprobe_free_probe_arg(struct probe_arg *arg)
{
struct fetch_insn *code = arg->code;

7
kernel/trace/trace_probe.h
View File

@ -272,11 +272,8 @@ find_event_file_link(struct trace_probe *tp, struct trace_event_file *file)
#define TPARG_FL_FENTRY BIT(2)
#define TPARG_FL_MASK GENMASK(2, 0)
extern int traceprobe_parse_probe_arg(char *arg, ssize_t *size,
struct probe_arg *parg, unsigned int flags);
extern int traceprobe_conflict_field_name(const char *name,
struct probe_arg *args, int narg);
extern int traceprobe_parse_probe_arg(struct trace_probe *tp, int i,
char *arg, unsigned int flags);
extern int traceprobe_update_arg(struct probe_arg *arg);
extern void traceprobe_free_probe_arg(struct probe_arg *arg);

44
kernel/trace/trace_uprobe.c
View File

@ -517,51 +517,11 @@ static int create_trace_uprobe(int argc, char **argv)
}
/* parse arguments */
ret = 0;
for (i = 0; i < argc && i < MAX_TRACE_ARGS; i++) {
struct probe_arg *parg = &tu->tp.args[i];
/* Increment count for freeing args in error case */
tu->tp.nr_args++;
/* Parse argument name */
arg = strchr(argv[i], '=');
if (arg) {
*arg++ = '\0';
parg->name = kstrdup(argv[i], GFP_KERNEL);
} else {
arg = argv[i];
/* If argument name is omitted, set "argN" */
snprintf(buf, MAX_EVENT_NAME_LEN, "arg%d", i + 1);
parg->name = kstrdup(buf, GFP_KERNEL);
}
if (!parg->name) {
pr_info("Failed to allocate argument[%d] name.\n", i);
ret = -ENOMEM;
goto error;
}
if (!is_good_name(parg->name)) {
pr_info("Invalid argument[%d] name: %s\n", i, parg->name);
ret = -EINVAL;
goto error;
}
if (traceprobe_conflict_field_name(parg->name, tu->tp.args, i)) {
pr_info("Argument[%d] name '%s' conflicts with "
"another field.\n", i, argv[i]);
ret = -EINVAL;
goto error;
}
/* Parse fetch argument */
ret = traceprobe_parse_probe_arg(arg, &tu->tp.size, parg,
ret = traceprobe_parse_probe_arg(&tu->tp, i, argv[i],
is_return ? TPARG_FL_RETURN : 0);
if (ret) {
pr_info("Parse error at argument[%d]. (%d)\n", i, ret);
if (ret)
goto error;
}
}
ret = register_trace_uprobe(tu);