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tracing/uprobes: Support perf-style return probe

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Support perf-style return probe ("SYMBOL%return") for uprobe events
as same as kprobe events does.

Link: https://lkml.kernel.org/r/159972814601.428528.7641183316212425445.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu 2020-09-10 17:55:46 +09:00 committed by Steven Rostedt (VMware)
parent 4725cd8997
commit 3dd3aae32d
2 changed files with 15 additions and 2 deletions
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2
kernel/trace/trace.c
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@ -5125,7 +5125,7 @@ static const char readme_msg[] =
"place (kretprobe): [<module>:]<symbol>[+<offset>]%return|<memaddr>\n"
#endif
#ifdef CONFIG_UPROBE_EVENTS
" place (uprobe): <path>:<offset>[(ref_ctr_offset)]\n"
" place (uprobe): <path>:<offset>[%return][(ref_ctr_offset)]\n"
#endif
"\t args: <name>=fetcharg[:type]\n"
"\t fetcharg: %<register>, @<address>, @<symbol>[+|-<offset>],\n"

15
kernel/trace/trace_uprobe.c
View File

@ -528,7 +528,7 @@ end:
/*
* Argument syntax:
* - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]
* - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET[%return][(REF)] [FETCHARGS]
*/
static int trace_uprobe_create(int argc, const char **argv)
{
@ -617,6 +617,19 @@ static int trace_uprobe_create(int argc, const char **argv)
}
}
/* Check if there is %return suffix */
tmp = strchr(arg, '%');
if (tmp) {
if (!strcmp(tmp, "%return")) {
*tmp = '\0';
is_return = true;
} else {
trace_probe_log_err(tmp - filename, BAD_ADDR_SUFFIX);
ret = -EINVAL;
goto fail_address_parse;
}
}
/* Parse uprobe offset. */
ret = kstrtoul(arg, 0, &offset);
if (ret) {