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tracing/uprobes: Add @+file_offset fetch method

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Enable to fetch data from a file offset.  Currently it only supports
fetching from same binary uprobe set.  It'll translate the file offset
to a proper virtual address in the process.

The syntax is "@+OFFSET" as it does similar to normal memory fetching
(@ADDR) which does no address translation.

Suggested-by: Oleg Nesterov <oleg@redhat.com>
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
2013-11-25 13:42:47 +09:00
committed by Steven Rostedt
parent 72fd293aa9
commit b7e0bf341f
5 changed files with 63 additions and 1 deletions
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kernel/trace/trace_probe.c
+12 -1
View File
@@ -374,7 +374,7 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
}
break;
case '@': /* memory or symbol */
case '@': /* memory, file-offset or symbol */
if (isdigit(arg[1])) {
ret = kstrtoul(arg + 1, 0, &param);
if (ret)
@@ -382,6 +382,17 @@ static int parse_probe_arg(char *arg, const struct fetch_type *t,
f->fn = t->fetch[FETCH_MTD_memory];
f->data = (void *)param;
} else if (arg[1] == '+') {
/* kprobes don't support file offsets */
if (is_kprobe)
return -EINVAL;
ret = kstrtol(arg + 2, 0, &offset);
if (ret)
break;
f->fn = t->fetch[FETCH_MTD_file_offset];
f->data = (void *)offset;
} else {
/* uprobes don't support symbols */
if (!is_kprobe)