1 #!/bin/bash 1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0 2 # SPDX-License-Identifier: GPL-2.0
3 # 3 #
4 # Disassemble a single function. 4 # Disassemble a single function.
5 # 5 #
6 # usage: objdump-func <file> <func> [<func> .. !! 6 # usage: objdump-func <file> <func>
7 7
8 set -o errexit 8 set -o errexit
9 set -o nounset 9 set -o nounset
10 10
11 OBJDUMP="${CROSS_COMPILE:-}objdump" 11 OBJDUMP="${CROSS_COMPILE:-}objdump"
12 12
13 command -v gawk >/dev/null 2>&1 || die "gawk i 13 command -v gawk >/dev/null 2>&1 || die "gawk isn't installed"
14 14
15 usage() { 15 usage() {
16 echo "usage: objdump-func <file> <func !! 16 echo "usage: objdump-func <file> <func>" >&2
17 exit 1 17 exit 1
18 } 18 }
19 19
20 [[ $# -lt 2 ]] && usage 20 [[ $# -lt 2 ]] && usage
21 21
22 OBJ=$1; shift 22 OBJ=$1; shift
23 FUNCS=("$@") !! 23 FUNC=$1; shift
24 24
25 ${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FU !! 25 # Secret feature to allow adding extra objdump args at the end
26 BEGIN { split(_funcs, funcs); } !! 26 EXTRA_ARGS=$@
27 /^$/ { func_match=0; } !! 27
28 /<.*>:/ { !! 28 # Note this also matches compiler-added suffixes like ".cold", etc
29 f = gensub(/.*<(.*)>:/, "\\1", !! 29 ${OBJDUMP} -wdr $EXTRA_ARGS $OBJ | gawk -M -v f=$FUNC '/^$/ { P=0; } $0 ~ "<" f "(\\..*)?>:" { P=1; O=strtonum("0x" $1); } { if (P) { o=strtonum("0x" $1); printf("%04x ", o-O); print $0; } }'
30 for (i in funcs) { <<
31 # match compiler-added <<
32 if (f ~ "^" funcs[i] " <<
33 func_match = 1 <<
34 base = strtonu <<
35 break; <<
36 } <<
37 } <<
38 } <<
39 { <<
40 if (func_match) { <<
41 addr = strtonum("0x" $ <<
42 printf("%04x ", addr - <<
43 print; <<
44 } <<
45 }' <<
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