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> [<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> [<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 FUNCS=("$@")
24 24
25 ${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FU 25 ${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FUNCS[*]}" '
26 BEGIN { split(_funcs, funcs); } 26 BEGIN { split(_funcs, funcs); }
27 /^$/ { func_match=0; } 27 /^$/ { func_match=0; }
28 /<.*>:/ { 28 /<.*>:/ {
29 f = gensub(/.*<(.*)>:/, "\\1", 29 f = gensub(/.*<(.*)>:/, "\\1", 1);
30 for (i in funcs) { 30 for (i in funcs) {
31 # match compiler-added 31 # match compiler-added suffixes like ".cold", etc
32 if (f ~ "^" funcs[i] " 32 if (f ~ "^" funcs[i] "(\\..*)?") {
33 func_match = 1 33 func_match = 1;
34 base = strtonu 34 base = strtonum("0x" $1);
35 break; 35 break;
36 } 36 }
37 } 37 }
38 } 38 }
39 { 39 {
40 if (func_match) { 40 if (func_match) {
41 addr = strtonum("0x" $ 41 addr = strtonum("0x" $1);
42 printf("%04x ", addr - 42 printf("%04x ", addr - base);
43 print; 43 print;
44 } 44 }
45 }' 45 }'
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