linux-kernel - [PATCH v1 3/3] tools: Use tools/dis-asm-compat.h to fix compilation errors with new binutils

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Message-Id: <20220703044814.892617-5-andres@anarazel.de>
Date:   Sat,  2 Jul 2022 21:48:14 -0700
From:   Andres Freund <andres@...razel.de>
To:     linux-kernel@...r.kernel.org
Cc:     Quentin Monnet <quentin@...valent.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH v1 3/3] tools: Use tools/dis-asm-compat.h to fix compilation errors with new binutils

binutils changed the signature of init_disassemble_info(), which now causes
compilation failures for tools/{perf,bpf} on e.g. debian unstable. Relevant
binutils commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=60a3da00bd5407f07

Use the previously introduced compat header to fix the build failures.

I verified that:
- perf can still disassemble bpf programs
- bpftool can still disassemble bpf programs, both plain in json
- bpf_jit_disasm still works - it does. Although it turns out that
  independent of these changes bpf_jit_enable = 2 currently is broken, see
  https://lore.kernel.org/20220703030210.pmjft7qc2eajzi6c@alap3.anarazel.de

Cc: Quentin Monnet <quentin@...valent.com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Link: http://lore.kernel.org/lkml/20220622181918.ykrs5rsnmx3og4sv@alap3.anarazel.de
Signed-off-by: Andres Freund <andres@...razel.de>
---
 tools/bpf/bpf_jit_disasm.c     |  5 ++++-
 tools/bpf/bpftool/jit_disasm.c | 40 +++++++++++++++++++++++++++-------
 tools/perf/util/annotate.c     |  7 +++---
 3 files changed, 40 insertions(+), 12 deletions(-)

diff --git a/tools/bpf/bpf_jit_disasm.c b/tools/bpf/bpf_jit_disasm.c
index c8ae95804728..a90a5d110f92 100644
--- a/tools/bpf/bpf_jit_disasm.c
+++ b/tools/bpf/bpf_jit_disasm.c
@@ -28,6 +28,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <limits.h>
+#include <tools/dis-asm-compat.h>
 
 #define CMD_ACTION_SIZE_BUFFER		10
 #define CMD_ACTION_READ_ALL		3
@@ -64,7 +65,9 @@ static void get_asm_insns(uint8_t *image, size_t len, int opcodes)
 	assert(bfdf);
 	assert(bfd_check_format(bfdf, bfd_object));
 
-	init_disassemble_info(&info, stdout, (fprintf_ftype) fprintf);
+	init_disassemble_info_compat(&info, stdout,
+				     (fprintf_ftype) fprintf,
+				     fprintf_styled);
 	info.arch = bfd_get_arch(bfdf);
 	info.mach = bfd_get_mach(bfdf);
 	info.buffer = image;
diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
index 24734f2249d6..f0d5c5f0eb60 100644
--- 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, 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 +71,30 @@ 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, 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 +121,13 @@ 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) {
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 82cc396ef516..daea1867381d 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -41,6 +41,7 @@
 #include <linux/string.h>
 #include <subcmd/parse-options.h>
 #include <subcmd/run-command.h>
+#include <tools/dis-asm-compat.h>
 
 /* FIXME: For the HE_COLORSET */
 #include "ui/browser.h"
@@ -1762,9 +1763,9 @@ static int symbol__disassemble_bpf(struct symbol *sym,
 		ret = errno;
 		goto out;
 	}
-	init_disassemble_info(&info, s,
-			      (fprintf_ftype) fprintf);
-
+	init_disassemble_info_compat(&info, s,
+				     (fprintf_ftype) fprintf,
+				     fprintf_styled);
 	info.arch = bfd_get_arch(bfdf);
 	info.mach = bfd_get_mach(bfdf);
 
-- 
2.35.1.677.gabf474a5dd