perf probe: Support comp_dir to find an absolute source path

Gcc generates DW_AT_comp_dir and stores relative source path if building kernel
without O= option. In that case, perf probe --line sometimes doesn't work
without --source option, because it tries to access relative source path.

This adds DW_AT_comp_dir support to perf probe for finding an absolute source
path when no --source option.

LKML-Reference: <4C36EBE7.3060802@hitachi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index a934a364c30f..37dcdb651a69 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -144,6 +144,15 @@ static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
         return src;
 }
 
+/* Get DW_AT_comp_dir (should be NULL with older gcc) */
+static const char *cu_get_comp_dir(Dwarf_Die *cu_die)
+{
+        Dwarf_Attribute attr;
+        if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
+                return NULL;
+        return dwarf_formstring(&attr);
+}
+
 /* Compare diename and tname */
 static bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
 {
@@ -1374,6 +1383,7 @@ int find_line_range(int fd, struct line_range *lr)
         size_t cuhl;
         Dwarf_Die *diep;
         Dwarf *dbg;
+        const char *comp_dir;
 
         dbg = dwarf_begin(fd, DWARF_C_READ);
         if (!dbg) {
@@ -1409,6 +1419,17 @@ int find_line_range(int fd, struct line_range *lr)
                 }
                 off = noff;
         }
+
+        /* Store comp_dir */
+        if (lf.found) {
+                comp_dir = cu_get_comp_dir(&lf.cu_die);
+                if (comp_dir) {
+                        lr->comp_dir = strdup(comp_dir);
+                        if (!lr->comp_dir)
+                                ret = -ENOMEM;
+                }
+        }
+
         pr_debug("path: %s\n", lr->path);
         dwarf_end(dbg);