[PATCH] perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

[PATCH] perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

[Namhyung Kim]

The dwarf_getcfi() only checks .debug_frame section for CFI, but as
most binaries only have .eh_frame it'd return NULL and it makes
some variables inaccessible.

Using dwarf_getcfi_elf (along with dwarf_getelf()) allows to show and
add probe to more variables.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/probe-finder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 3bf0c8cdccb7..d58da0672736 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -985,7 +985,7 @@ static int debuginfo__find_probes(struct debuginfo *dbg,
 
 #if _ELFUTILS_PREREQ(0, 142)
 	/* Get the call frame information from this dwarf */
-	pf->cfi = dwarf_getcfi(dbg->dbg);
+	pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg));
 #endif
 
 	off = 0;
-- 
1.7.11.7

Re: [PATCH] perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

[Masami Hiramatsu]

(2014/04/07 16:05), Namhyung Kim wrote:
> The dwarf_getcfi() only checks .debug_frame section for CFI, but as
> most binaries only have .eh_frame it'd return NULL and it makes
> some variables inaccessible.
> 
> Using dwarf_getcfi_elf (along with dwarf_getelf()) allows to show and
> add probe to more variables.
> 
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Thank you for fixing :)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>

> ---
>  tools/perf/util/probe-finder.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 3bf0c8cdccb7..d58da0672736 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -985,7 +985,7 @@ static int debuginfo__find_probes(struct debuginfo *dbg,
>  
>  #if _ELFUTILS_PREREQ(0, 142)
>  	/* Get the call frame information from this dwarf */
> -	pf->cfi = dwarf_getcfi(dbg->dbg);
> +	pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg));
>  #endif
>  
>  	off = 0;
> 


-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@hitachi.com

[tip:perf/urgent] perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

[tip-bot for Namhyung Kim]

Commit-ID:  03d89412981a7681971bc77edba1669595763030
Gitweb:     http://git.kernel.org/tip/03d89412981a7681971bc77edba1669595763030
Author:     Namhyung Kim <namhyung@kernel.org>
AuthorDate: Mon, 7 Apr 2014 16:05:48 +0900
Committer:  Jiri Olsa <jolsa@redhat.com>
CommitDate: Mon, 14 Apr 2014 12:55:40 +0200

perf probe: Use dwarf_getcfi_elf() instead of dwarf_getcfi()

The dwarf_getcfi() only checks .debug_frame section for CFI, but as
most binaries only have .eh_frame it'd return NULL and it makes
some variables inaccessible.

Using dwarf_getcfi_elf (along with dwarf_getelf()) allows to show and
add probe to more variables.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Link: http://lkml.kernel.org/r/1396854348-9296-1-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
 tools/perf/util/probe-finder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index fae274e..5627621 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -985,7 +985,7 @@ static int debuginfo__find_probes(struct debuginfo *dbg,
 
 #if _ELFUTILS_PREREQ(0, 142)
 	/* Get the call frame information from this dwarf */
-	pf->cfi = dwarf_getcfi(dbg->dbg);
+	pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg));
 #endif
 
 	off = 0;