linux_dsm_epyc7002/test-dwarf_getlocations.c at 8dccafaa281aa1d240a58bbcdff338aec114a021 - linux_dsm_epyc7002 - Cephas TEA

AuxXxilium/linux_dsm_epyc7002

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Arnaldo Carvalho de Melo 4924734570 perf probe: Check if dwarf_getlocations() is available

If not, tell the user that:

  config/Makefile:273: Old libdw.h, finding variables at given 'perf probe' point will not work, install elfutils-devel/libdw-dev >= 0.157

And return -ENOTSUPP in die_get_var_range(), failing features that
need it, like the one pointed out above.

This fixes the build on older systems, such as Ubuntu 12.04.5.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Vinson Lee <vlee@freedesktop.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-9l7luqkq4gfnx7vrklkq4obs@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2016-05-12 11:26:59 -03:00

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 #include <stdlib.h>
 #include <elfutils/libdw.h>
 int main(void)
 {
 	Dwarf_Addr base, start, end;
 	Dwarf_Attribute attr;
 	Dwarf_Op *op;
         size_t nops;
 	ptrdiff_t offset = 0;
         return (int)dwarf_getlocations(&attr, offset, &base, &start, &end, &op, &nops);
 }