1#!/bin/awk -f
2# SPDX-License-Identifier: GPL-2.0
3# Usage: objdump -d a.out | awk -f objdump_reformat.awk | ./insn_decoder_test
4# Reformats the disassembly as follows:
5# - Removes all lines except the disassembled instructions.
6# - For instructions that exceed 1 line (7 bytes), crams all the hex bytes
7# into a single line.
8# - Remove bad(or prefix only) instructions
9
10BEGIN {
11	prev_addr = ""
12	prev_hex = ""
13	prev_mnemonic = ""
14	bad_expr = "(\\(bad\\)|^rex|^.byte|^rep(z|nz)$|^lock$|^es$|^cs$|^ss$|^ds$|^fs$|^gs$|^data(16|32)$|^addr(16|32|64))"
15	fwait_expr = "^9b "
16	fwait_str="9b\tfwait"
17}
18
19/^ *[0-9a-f]+ <[^>]*>:/ {
20	# Symbol entry
21	printf("%s%s\n", $2, $1)
22}
23
24/^ *[0-9a-f]+:/ {
25	if (split($0, field, "\t") < 3) {
26		# This is a continuation of the same insn.
27		prev_hex = prev_hex field[2]
28	} else {
29		# Skip bad instructions
30		if (match(prev_mnemonic, bad_expr))
31			prev_addr = ""
32		# Split fwait from other f* instructions
33		if (match(prev_hex, fwait_expr) && prev_mnemonic != "fwait") {
34			printf "%s\t%s\n", prev_addr, fwait_str
35			sub(fwait_expr, "", prev_hex)
36		}
37		if (prev_addr != "")
38			printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
39		prev_addr = field[1]
40		prev_hex = field[2]
41		prev_mnemonic = field[3]
42	}
43}
44
45END {
46	if (prev_addr != "")
47		printf "%s\t%s\t%s\n", prev_addr, prev_hex, prev_mnemonic
48}
49