> On Jun 13, 2019, at 6:20 AM, Josh Poimboeuf <jpoim...@redhat.com> wrote:
>
> 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.
These work well in my tests. Thanks!
Tested-by: Song Liu <songliubrav...@fb.com>
>
>
> 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
>
