From: Andres Freund andres@anarazel.de
commit 600b7b26c07a070d0153daa76b3806c1e52c9e00 upstream.
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%3Ba=commit%3Bh=60a3da00bd5407...
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.d... Link: https://lore.kernel.org/r/20220801013834.156015-8-andres@anarazel.de Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Hauke Mehrtens hauke@hauke-m.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/bpf/bpftool/Makefile | 5 +++- tools/bpf/bpftool/jit_disasm.c | 42 +++++++++++++++++++++++++++++++++-------- 2 files changed, 38 insertions(+), 9 deletions(-)
--- a/tools/bpf/bpftool/Makefile +++ b/tools/bpf/bpftool/Makefile @@ -76,7 +76,7 @@ INSTALL ?= install RM ?= rm -f
FEATURE_USER = .bpftool -FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap \ +FEATURE_TESTS = libbfd disassembler-four-args disassembler-init-styled reallocarray zlib libcap \ clang-bpf-co-re FEATURE_DISPLAY = libbfd disassembler-four-args zlib libcap \ clang-bpf-co-re @@ -111,6 +111,9 @@ ifeq ($(feature-libcap), 1) CFLAGS += -DUSE_LIBCAP LIBS += -lcap endif +ifeq ($(feature-disassembler-init-styled), 1) + CFLAGS += -DDISASM_INIT_STYLED +endif
include $(wildcard $(OUTPUT)*.d)
--- a/tools/bpf/bpftool/jit_disasm.c +++ b/tools/bpf/bpftool/jit_disasm.c @@ -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, s }
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 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 *im 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) {