[PATCH dwarves v2 0/2] btf: support BTF_KIND_ENUM64

From: Yonghong Song <yhs@fb.com>
To: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>,
	<dwarves@vger.kernel.org>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>, <bpf@vger.kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>, <kernel-team@fb.com>
Subject: [PATCH dwarves v2 0/2] btf: support BTF_KIND_ENUM64
Date: Wed, 15 Jun 2022 16:03:06 -0700	[thread overview]
Message-ID: <20220615230306.851750-1-yhs@fb.com> (raw)

Add support for enum64. For 64-bit enumerator value,
previously, the value is truncated into 32bit, e.g.,
for the following enum in linux uapi bpf.h,
  enum {
        BPF_F_INDEX_MASK                = 0xffffffffULL,
        BPF_F_CURRENT_CPU               = BPF_F_INDEX_MASK,
  /* BPF_FUNC_perf_event_output for sk_buff input context. */
        BPF_F_CTXLEN_MASK               = (0xfffffULL << 32),
  };

BPF_F_CTXLEN_MASK will be encoded with 0 with BTF_KIND_ENUM
after pahole dwarf-to-btf conversion.
With this patch, the BPF_F_CTXLEN_MASK will be encoded properly
with BTF_KIND_ENUM64.

This patch is on top of tmp.master since tmp.master has not
been sync'ed with master branch yet.

Changelogs:
  v1 -> v2:
    - Add flag --skip_encoding_btf_enum64 to disable newly-added functionality.

Yonghong Song (2):
  libbpf: Sync with latest libbpf repo
  btf: Support BTF_KIND_ENUM64

 btf_encoder.c     | 65 +++++++++++++++++++++++++++++++++++------------
 btf_encoder.h     |  2 +-
 dwarf_loader.c    | 12 +++++++++
 dwarves.h         |  4 ++-
 dwarves_fprintf.c |  6 ++++-
 lib/bpf           |  2 +-
 pahole.c          | 10 +++++++-
 7 files changed, 80 insertions(+), 21 deletions(-)

-- 
2.30.2