linux-kernel - [PATCH 0/9] x86/bpf: unwinder fixes

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Message-Id: <cover.1560431531.git.jpoimboe@redhat.com>
Date:   Thu, 13 Jun 2019 08:20:57 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Kairui Song <kasong@...hat.com>
Subject: [PATCH 0/9] x86/bpf: unwinder fixes

The following commit

  d15d356887e7 ("perf/x86: Make perf callchains work without CONFIG_FRAME_POINTER")

was a step in the right direction, but it triggered some BPF selftest
failures.  That commit exposed the fact that we currently can't unwind
through BPF code.

- Patch 1 (originally from Song Liu) fixes a bug in the above commit
  (regs->ip getting skipped in the stack trace).

- Patch 2 fixes non-JIT BPF for the ORC unwinder.

- Patches 3-5 are preparatory improvements for patch 6.

- Patch 6 fixes JIT BPF for the FP unwinder.

- Patch 7 fixes JIT BPF for the ORC unwinder (building on patch 6).

- Patches 8-9 are some readability cleanups.


Josh Poimboeuf (8):
  objtool: Fix ORC unwinding in non-JIT BPF generated code
  x86/bpf: Move epilogue generation to a dedicated function
  x86/bpf: Simplify prologue generation
  x86/bpf: Support SIB byte generation
  x86/bpf: Fix JIT frame pointer usage
  x86/unwind/orc: Fall back to using frame pointers for generated code
  x86/bpf: Convert asm comments to AT&T syntax
  x86/bpf: Convert MOV function/macro argument ordering to AT&T syntax

Song Liu (1):
  perf/x86: Always store regs->ip in perf_callchain_kernel()

 arch/x86/events/core.c       |  10 +-
 arch/x86/kernel/unwind_orc.c |  26 ++-
 arch/x86/net/bpf_jit_comp.c  | 355 ++++++++++++++++++++---------------
 kernel/bpf/core.c            |   5 +-
 tools/objtool/check.c        |  16 +-
 5 files changed, 246 insertions(+), 166 deletions(-)

-- 
2.20.1