[bpf-next,0/3] libbpf: Fix accessing the first syscall argument on s390

Message

Ilya Leoshkevich Feb. 1, 2022, 11:41 p.m. UTC

libbpf CI reported a bpf_syscall_macro test failure on s390 [1], which
happens because the code uses gprs[2] instead of orig_gpr2 to access
the first syscall argument. Patches 1-2 are preparations, patch 3 fixes
the issue.

@Heiko, @Vasily, @Christian, @Alexander - could you please review
patch 1, which touches arch/s390? Would it be ok to put it into
bpf-next tree?

[1] https://github.com/libbpf/libbpf/runs/5025905587

Ilya Leoshkevich (3):
  s390/bpf: Add orig_gpr2 to user_pt_regs
  selftests/bpf: Fix an endianness issue in bpf_syscall_macro test
  libbpf: Fix accessing the first syscall argument on s390

 arch/s390/include/asm/ptrace.h                        | 2 +-
 arch/s390/include/uapi/asm/ptrace.h                   | 1 +
 tools/lib/bpf/bpf_tracing.h                           | 9 +++++++++
 tools/testing/selftests/bpf/progs/bpf_syscall_macro.c | 5 ++++-
 4 files changed, 15 insertions(+), 2 deletions(-)