[PATCH V4 2/4] Force MAPPING_TYPE__IDENTIY for PIE

[Leo Yan]

On 8/28/2024 6:09 AM, Steve Clevenger wrote:
> 
> Use dso__is_pie() to check whether the DSO file is a Position
> Independent Executable (PIE). If PIE, change the MAPPING_TYPE to
> MAPPING_TYPE__IDENTITY so a zero map pgoff (text offset) is passed
> into the script.
> 
> Signed-off-by: Steve Clevenger <scclevenger at os.amperecomputing.com>

Reviewed-by: Leo Yan <leo.yan at arm.com>

> ---
>  tools/perf/util/map.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index e781c8d56a9a..c846faec177b 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -173,8 +173,8 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
>                 assert(!dso__kernel(dso));
>                 map__init(result, start, start + len, pgoff, dso, prot, flags);
> 
> -               if (anon || no_dso) {
> -                       map->mapping_type = MAPPING_TYPE__IDENTITY;
> +               if (anon || no_dso || dso__is_pie(dso)) {
> +                       map__set_mapping_type(map, MAPPING_TYPE__IDENTITY);
> 
>                         /*
>                          * Set memory without DSO as loaded. All map__find_*
> --
> 2.25.1
>