target/linux/generic/backport-5.15/060-v6.0-02-tools-include-add-dis-asm-compat.h-to-handle-version.patch

   1 From 08ec5766e5cf7b24fdebefb83b6f760bceeddf40 Mon Sep 17 00:00:00 2001
   2 From: Andres Freund <andres@anarazel.de>
   3 Date: Sun, 31 Jul 2022 18:38:29 -0700
   4 Subject: [PATCH 2/5] tools include: add dis-asm-compat.h to handle version
   5  differences
   6
   7 binutils changed the signature of init_disassemble_info(), which now causes
   8 compilation failures for tools/{perf,bpf}, e.g. on debian unstable.
   9
  10 Relevant binutils commit:
  11
  12   https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07
  13
  14 This commit introduces a wrapper for init_disassemble_info(), to avoid
  15 spreading #ifdef DISASM_INIT_STYLED to a bunch of places. Subsequent
  16 commits will use it to fix the build failures.
  17
  18 It likely is worth adding a wrapper for disassember(), to avoid the already
  19 existing DISASM_FOUR_ARGS_SIGNATURE ifdefery.
  20
  21 Signed-off-by: Andres Freund <andres@anarazel.de>
  22 Signed-off-by: Ben Hutchings <benh@debian.org>
  23 Acked-by: Quentin Monnet <quentin@isovalent.com>
  24 Cc: Alexei Starovoitov <ast@kernel.org>
  25 Cc: Ben Hutchings <benh@debian.org>
  26 Cc: Jiri Olsa <jolsa@kernel.org>
  27 Cc: Quentin Monnet <quentin@isovalent.com>
  28 Cc: Sedat Dilek <sedat.dilek@gmail.com>
  29 Cc: bpf@vger.kernel.org
  30 Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
  31 Link: https://lore.kernel.org/r/20220801013834.156015-4-andres@anarazel.de
  32 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
  33 (cherry picked from commit a45b3d6926231c3d024ea0de4f7bd967f83709ee)
  34 ---
  35  tools/include/tools/dis-asm-compat.h | 55 ++++++++++++++++++++++++++++
  36  1 file changed, 55 insertions(+)
  37  create mode 100644 tools/include/tools/dis-asm-compat.h
  38
  39 --- /dev/null
  40 +++ b/tools/include/tools/dis-asm-compat.h
  41 @@ -0,0 +1,55 @@
  42 +/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
  43 +#ifndef _TOOLS_DIS_ASM_COMPAT_H
  44 +#define _TOOLS_DIS_ASM_COMPAT_H
  45 +
  46 +#include <stdio.h>
  47 +#include <dis-asm.h>
  48 +
  49 +/* define types for older binutils version, to centralize ifdef'ery a bit */
  50 +#ifndef DISASM_INIT_STYLED
  51 +enum disassembler_style {DISASSEMBLER_STYLE_NOT_EMPTY};
  52 +typedef int (*fprintf_styled_ftype) (void *, enum disassembler_style, const char*, ...);
  53 +#endif
  54 +
  55 +/*
  56 + * Trivial fprintf wrapper to be used as the fprintf_styled_func argument to
  57 + * init_disassemble_info_compat() when normal fprintf suffices.
  58 + */
  59 +static inline int fprintf_styled(void *out,
  60 +                                enum disassembler_style style,
  61 +                                const char *fmt, ...)
  62 +{
  63 +       va_list args;
  64 +       int r;
  65 +
  66 +       (void)style;
  67 +
  68 +       va_start(args, fmt);
  69 +       r = vfprintf(out, fmt, args);
  70 +       va_end(args);
  71 +
  72 +       return r;
  73 +}
  74 +
  75 +/*
  76 + * Wrapper for init_disassemble_info() that hides version
  77 + * differences. Depending on binutils version and architecture either
  78 + * fprintf_func or fprintf_styled_func will be called.
  79 + */
  80 +static inline void init_disassemble_info_compat(struct disassemble_info *info,
  81 +                                               void *stream,
  82 +                                               fprintf_ftype unstyled_func,
  83 +                                               fprintf_styled_ftype styled_func)
  84 +{
  85 +#ifdef DISASM_INIT_STYLED
  86 +       init_disassemble_info(info, stream,
  87 +                             unstyled_func,
  88 +                             styled_func);
  89 +#else
  90 +       (void)styled_func;
  91 +       init_disassemble_info(info, stream,
  92 +                             unstyled_func);
  93 +#endif
  94 +}
  95 +
  96 +#endif /* _TOOLS_DIS_ASM_COMPAT_H */