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21e350233b
Add a simple script which disassembles a single function from an object file. Comes in handy for objtool warnings and kernel stack traces. Originally-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Link: https://lore.kernel.org/r/3eb3f091fd6bd9caba50392ceab98ce756804f3b.1650578171.git.jpoimboe@redhat.com
30 lines
711 B
Bash
Executable File
30 lines
711 B
Bash
Executable File
#!/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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# usage: objdump-func <file> <func>
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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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echo "usage: objdump-func <file> <func>" >&2
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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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FUNC=$1; shift
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# Secret feature to allow adding extra objdump args at the end
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EXTRA_ARGS=$@
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# Note this also matches compiler-added suffixes like ".cold", etc
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${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; } }'
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