2023-08-30 17:31:07 +02:00
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Disassemble a single function.
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#
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2023-10-24 12:59:35 +02:00
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# usage: objdump-func <file> <func> [<func> ...]
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2023-08-30 17:31:07 +02:00
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set -o errexit
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set -o nounset
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OBJDUMP="${CROSS_COMPILE:-}objdump"
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command -v gawk >/dev/null 2>&1 || die "gawk isn't installed"
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usage() {
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2023-10-24 12:59:35 +02:00
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echo "usage: objdump-func <file> <func> [<func> ...]" >&2
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2023-08-30 17:31:07 +02:00
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exit 1
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}
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[[ $# -lt 2 ]] && usage
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OBJ=$1; shift
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2023-10-24 12:59:35 +02:00
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FUNCS=("$@")
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${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FUNCS[*]}" '
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BEGIN { split(_funcs, funcs); }
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/^$/ { func_match=0; }
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/<.*>:/ {
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f = gensub(/.*<(.*)>:/, "\\1", 1);
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for (i in funcs) {
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# match compiler-added suffixes like ".cold", etc
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if (f ~ "^" funcs[i] "(\\..*)?") {
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func_match = 1;
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base = strtonum("0x" $1);
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break;
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}
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}
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}
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{
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if (func_match) {
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addr = strtonum("0x" $1);
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printf("%04x ", addr - base);
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print;
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}
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}'
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