Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 208 insertions, 0 deletions

diff --git a/tools/bpf/bpftool/jit_disasm.c b/tools/bpf/bpftool/jit_disasm.c
new file mode 100644
index 000000000..24734f224
--- /dev/null
+++ b/tools/bpf/bpftool/jit_disasm.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+/*
+ * Based on:
+ *
+ * Minimal BPF JIT image disassembler
+ *
+ * Disassembles BPF JIT compiler emitted opcodes back to asm insn's for
+ * debugging or verification purposes.
+ *
+ * Copyright 2013 Daniel Borkmann <daniel@iogearbox.net>
+ * Licensed under the GNU General Public License, version 2.0 (GPLv2)
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <unistd.h>
+#include <string.h>
+#include <bfd.h>
+#include <dis-asm.h>
+#include <sys/stat.h>
+#include <limits.h>
+#include <bpf/libbpf.h>
+
+#include "json_writer.h"
+#include "main.h"
+
+static void get_exec_path(char *tpath, size_t size)
+{
+	const char *path = "/proc/self/exe";
+	ssize_t len;
+
+	len = readlink(path, tpath, size - 1);
+	assert(len > 0);
+	tpath[len] = 0;
+}
+
+static int oper_count;
+static int fprintf_json(void *out, const char *fmt, ...)
+{
+	va_list ap;
+	char *s;
+	int err;
+
+	va_start(ap, fmt);
+	err = vasprintf(&s, fmt, ap);
+	va_end(ap);
+	if (err < 0)
+		return -1;
+
+	if (!oper_count) {
+		int i;
+
+		/* Strip trailing spaces */
+		i = strlen(s) - 1;
+		while (s[i] == ' ')
+			s[i--] = '\0';
+
+		jsonw_string_field(json_wtr, "operation", s);
+		jsonw_name(json_wtr, "operands");
+		jsonw_start_array(json_wtr);
+		oper_count++;
+	} else if (!strcmp(fmt, ",")) {
+		   /* Skip */
+	} else {
+		jsonw_string(json_wtr, s);
+		oper_count++;
+	}
+	free(s);
+	return 0;
+}
+
+void disasm_print_insn(unsigned char *image, ssize_t len, int opcodes,
+		       const char *arch, const char *disassembler_options,
+		       const struct btf *btf,
+		       const struct bpf_prog_linfo *prog_linfo,
+		       __u64 func_ksym, unsigned int func_idx,
+		       bool linum)
+{
+	const struct bpf_line_info *linfo = NULL;
+	disassembler_ftype disassemble;
+	struct disassemble_info info;
+	unsigned int nr_skip = 0;
+	int count, i, pc = 0;
+	char tpath[PATH_MAX];
+	bfd *bfdf;
+
+	if (!len)
+		return;
+
+	memset(tpath, 0, sizeof(tpath));
+	get_exec_path(tpath, sizeof(tpath));
+
+	bfdf = bfd_openr(tpath, NULL);
+	assert(bfdf);
+	assert(bfd_check_format(bfdf, bfd_object));
+
+	if (json_output)
+		init_disassemble_info(&info, stdout,
+				      (fprintf_ftype) fprintf_json);
+	else
+		init_disassemble_info(&info, stdout,
+				      (fprintf_ftype) fprintf);
+
+	/* Update architecture info for offload. */
+	if (arch) {
+		const bfd_arch_info_type *inf = bfd_scan_arch(arch);
+
+		if (inf) {
+			bfdf->arch_info = inf;
+		} else {
+			p_err("No libbfd support for %s", arch);
+			return;
+		}
+	}
+
+	info.arch = bfd_get_arch(bfdf);
+	info.mach = bfd_get_mach(bfdf);
+	if (disassembler_options)
+		info.disassembler_options = disassembler_options;
+	info.buffer = image;
+	info.buffer_length = len;
+
+	disassemble_init_for_target(&info);
+
+#ifdef DISASM_FOUR_ARGS_SIGNATURE
+	disassemble = disassembler(info.arch,
+				   bfd_big_endian(bfdf),
+				   info.mach,
+				   bfdf);
+#else
+	disassemble = disassembler(bfdf);
+#endif
+	assert(disassemble);
+
+	if (json_output)
+		jsonw_start_array(json_wtr);
+	do {
+		if (prog_linfo) {
+			linfo = bpf_prog_linfo__lfind_addr_func(prog_linfo,
+								func_ksym + pc,
+								func_idx,
+								nr_skip);
+			if (linfo)
+				nr_skip++;
+		}
+
+		if (json_output) {
+			jsonw_start_object(json_wtr);
+			oper_count = 0;
+			if (linfo)
+				btf_dump_linfo_json(btf, linfo, linum);
+			jsonw_name(json_wtr, "pc");
+			jsonw_printf(json_wtr, "\"0x%x\"", pc);
+		} else {
+			if (linfo)
+				btf_dump_linfo_plain(btf, linfo, "; ",
+						     linum);
+			printf("%4x:\t", pc);
+		}
+
+		count = disassemble(pc, &info);
+		if (json_output) {
+			/* Operand array, was started in fprintf_json. Before
+			 * that, make sure we have a _null_ value if no operand
+			 * other than operation code was present.
+			 */
+			if (oper_count == 1)
+				jsonw_null(json_wtr);
+			jsonw_end_array(json_wtr);
+		}
+
+		if (opcodes) {
+			if (json_output) {
+				jsonw_name(json_wtr, "opcodes");
+				jsonw_start_array(json_wtr);
+				for (i = 0; i < count; ++i)
+					jsonw_printf(json_wtr, "\"0x%02hhx\"",
+						     (uint8_t)image[pc + i]);
+				jsonw_end_array(json_wtr);
+			} else {
+				printf("\n\t");
+				for (i = 0; i < count; ++i)
+					printf("%02x ",
+					       (uint8_t)image[pc + i]);
+			}
+		}
+		if (json_output)
+			jsonw_end_object(json_wtr);
+		else
+			printf("\n");
+
+		pc += count;
+	} while (count > 0 && pc < len);
+	if (json_output)
+		jsonw_end_array(json_wtr);
+
+	bfd_close(bfdf);
+}
+
+int disasm_init(void)
+{
+	bfd_init();
+	return 0;
+}