git.openwrt.org Git - openwrt/staging/pepe2k.git/blob

   1 From 042e7f11769adac0736d77d76262912b90724d7d Mon Sep 17 00:00:00 2001
   2 From: Andres Freund <andres@anarazel.de>
   3 Date: Sun, 31 Jul 2022 18:38:31 -0700
   4 Subject: [PATCH 4/5] tools bpf_jit_disasm: Fix compilation error with new
   5  binutils
   6
   7 binutils changed the signature of init_disassemble_info(), which now causes
   8 compilation to fail for tools/bpf/bpf_jit_disasm.c, e.g. on debian
   9 unstable.
  10
  11 Relevant binutils commit:
  12
  13   https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07
  14
  15 Wire up the feature test and switch to init_disassemble_info_compat(),
  16 which were introduced in prior commits, fixing the compilation failure.
  17
  18 I verified that bpf_jit_disasm can still disassemble bpf programs, both
  19 with the old and new dis-asm.h API. With old binutils there's no change in
  20 output before/after this patch. When comparing the output from old
  21 binutils (2.35) to new bintuils with the patch (upstream snapshot) there
  22 are a few output differences, but they are unrelated to this patch. An
  23 example hunk is:
  24
  25      f4:        mov    %r14,%rsi
  26      f7:        mov    %r15,%rdx
  27      fa:        mov    $0x2a,%ecx
  28   -  ff:        callq  0xffffffffea8c4988
  29   +  ff:        call   0xffffffffea8c4988
  30     104:        test   %rax,%rax
  31     107:        jge    0x0000000000000110
  32     109:        xor    %eax,%eax
  33   - 10b:        jmpq   0x0000000000000073
  34   + 10b:        jmp    0x0000000000000073
  35     110:        cmp    $0x16,%rax
  36
  37 However, I had to use an older kernel to generate the bpf_jit_enabled =
  38 2 output, as that has been broken since 5.18 / 1022a5498f6f745c ("bpf,
  39 x86_64: Use bpf_jit_binary_pack_alloc").
  40
  41   https://lore.kernel.org/20220703030210.pmjft7qc2eajzi6c@alap3.anarazel.de
  42
  43 Signed-off-by: Andres Freund <andres@anarazel.de>
  44 Acked-by: Quentin Monnet <quentin@isovalent.com>
  45 Cc: Alexei Starovoitov <ast@kernel.org>
  46 Cc: Ben Hutchings <benh@debian.org>
  47 Cc: Daniel Borkmann <daniel@iogearbox.net>
  48 Cc: Jiri Olsa <jolsa@kernel.org>
  49 Cc: Quentin Monnet <quentin@isovalent.com>
  50 Cc: Sedat Dilek <sedat.dilek@gmail.com>
  51 Cc: bpf@vger.kernel.org
  52 Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
  53 Link: https://lore.kernel.org/r/20220801013834.156015-6-andres@anarazel.de
  54 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
  55 (cherry picked from commit 96ed066054abf11c7d3e106e3011a51f3f1227a3)
  56 ---
  57  tools/bpf/Makefile         | 5 ++++-
  58  tools/bpf/bpf_jit_disasm.c | 5 ++++-
  59  2 files changed, 8 insertions(+), 2 deletions(-)
  60
  61 --- a/tools/bpf/Makefile
  62 +++ b/tools/bpf/Makefile
  63 @@ -34,7 +34,7 @@ else
  64  endif
  65
  66  FEATURE_USER = .bpf
  67 -FEATURE_TESTS = libbfd disassembler-four-args
  68 +FEATURE_TESTS = libbfd disassembler-four-args disassembler-init-styled
  69  FEATURE_DISPLAY = libbfd disassembler-four-args
  70
  71  check_feat := 1
  72 @@ -56,6 +56,9 @@ endif
  73  ifeq ($(feature-disassembler-four-args), 1)
  74  CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
  75  endif
  76 +ifeq ($(feature-disassembler-init-styled), 1)
  77 +CFLAGS += -DDISASM_INIT_STYLED
  78 +endif
  79
  80  $(OUTPUT)%.yacc.c: $(srctree)/tools/bpf/%.y
  81         $(QUIET_BISON)$(YACC) -o $@ -d $<
  82 --- a/tools/bpf/bpf_jit_disasm.c
  83 +++ b/tools/bpf/bpf_jit_disasm.c
  84 @@ -28,6 +28,7 @@
  85  #include <sys/types.h>
  86  #include <sys/stat.h>
  87  #include <limits.h>
  88 +#include <tools/dis-asm-compat.h>
  89
  90  #define CMD_ACTION_SIZE_BUFFER         10
  91  #define CMD_ACTION_READ_ALL            3
  92 @@ -64,7 +65,9 @@ static void get_asm_insns(uint8_t *image
  93         assert(bfdf);
  94         assert(bfd_check_format(bfdf, bfd_object));
  95
  96 -       init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf);
  97 +       init_disassemble_info_compat(&info, stdout,
  98 +                                    (fprintf_ftype) fprintf,
  99 +                                    fprintf_styled);
 100         info.arch = bfd_get_arch(bfdf);
 101         info.mach = bfd_get_mach(bfdf);
 102         info.buffer = image;