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tools bpftool: Fix compilation error with new binutils 

binutils changed the signature of init_disassemble_info(), which now causes
compilation to fail for tools/bpf/bpftool/jit_disasm.c, e.g. on debian
unstable.

Relevant binutils commit:

  https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07

Wire up the feature test and switch to init_disassemble_info_compat(),
which were introduced in prior commits, fixing the compilation failure.

I verified that bpftool can still disassemble bpf programs, both with an
old and new dis-asm.h API. There are no output changes for plain and json
formats. When comparing the output from old binutils (2.35)
to new bintuils with the patch (upstream snapshot) there are a few output
differences, but they are unrelated to this patch. An example hunk is:

     2f:	pop    %r14
     31:	pop    %r13
     33:	pop    %rbx
  -  34:	leaveq
  -  35:	retq
  +  34:	leave
  +  35:	ret

Signed-off-by: Andres Freund <andres@anarazel.de>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Ben Hutchings <benh@debian.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Quentin Monnet <quentin@isovalent.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: bpf@vger.kernel.org
Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
Link: https://lore.kernel.org/r/20220801013834.156015-8-andres@anarazel.de
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Andres Freund 2022-07-31 18:38:33 -07:00 committed by Arnaldo Carvalho de Melo
parent bab211f637
commit 600b7b26c0
2 changed files with 38 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/bpf/bpftool/Makefile
View File

@ -93,7 +93,7 @@ INSTALL ?= install
RM ?= rm -f
FEATURE_USER = .bpftool
FEATURE_TESTS = libbfd disassembler-four-args zlib libcap \
FEATURE_TESTS = libbfd disassembler-four-args disassembler-init-styled zlib libcap \
clang-bpf-co-re
FEATURE_DISPLAY = libbfd disassembler-four-args zlib libcap \
clang-bpf-co-re
@ -117,6 +117,9 @@ endif
ifeq ($(feature-disassembler-four-args), 1)
CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
endif
ifeq ($(feature-disassembler-init-styled), 1)
CFLAGS += -DDISASM_INIT_STYLED
endif
LIBS = $(LIBBPF) -lelf -lz
LIBS_BOOTSTRAP = $(LIBBPF_BOOTSTRAP) -lelf -lz

42
tools/bpf/bpftool/jit_disasm.c
View File

@ -24,6 +24,7 @@
#include <sys/stat.h>
#include <limits.h>
#include <bpf/libbpf.h>
#include <tools/dis-asm-compat.h>
#include "json_writer.h"
#include "main.h"
@ -39,15 +40,12 @@ static void get_exec_path(char *tpath, size_t size)
}
static int oper_count;
static int fprintf_json(void *out, const char *fmt, ...)
static int printf_json(void *out, const char *fmt, va_list ap)
{
va_list ap;
char *s;
int err;
va_start(ap, fmt);
err = vasprintf(&s, fmt, ap);
va_end(ap);
if (err < 0)
return -1;
@ -73,6 +71,32 @@ static int fprintf_json(void *out, const char *fmt, ...)
return 0;
}
static int fprintf_json(void *out, const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = printf_json(out, fmt, ap);
va_end(ap);
return r;
}
static int fprintf_json_styled(void *out,
enum disassembler_style style __maybe_unused,
const char *fmt, ...)
{
va_list ap;
int r;
va_start(ap, fmt);
r = printf_json(out, fmt, ap);
va_end(ap);
return r;
}
void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
const char *arch, const char *disassembler_options,
const struct btf *btf,
@ -99,11 +123,13 @@ void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
assert(bfd_check_format(bfdf, bfd_object));
if (json_output)
init_disassemble_info(&info, stdout,
(fprintf_ftype) fprintf_json);
init_disassemble_info_compat(&info, stdout,
(fprintf_ftype) fprintf_json,
fprintf_json_styled);
else
init_disassemble_info(&info, stdout,
(fprintf_ftype) fprintf);
init_disassemble_info_compat(&info, stdout,
(fprintf_ftype) fprintf,
fprintf_styled);
/* Update architecture info for offload. */
if (arch) {