scripts/objdump-func

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Disassemble a single function.
   5 #
   6 # usage: objdump-func <file> <func>
   7
   8 set -o errexit
   9 set -o nounset
  10
  11 OBJDUMP="${CROSS_COMPILE:-}objdump"
  12
  13 command -v gawk >/dev/null 2>&1 || die "gawk isn't installed"
  14
  15 usage() {
  16         echo "usage: objdump-func <file> <func>" >&2
  17         exit 1
  18 }
  19
  20 [[ $# -lt 2 ]] && usage
  21
  22 OBJ=$1; shift
  23 FUNC=$1; shift
  24
  25 # Secret feature to allow adding extra objdump args at the end
  26 EXTRA_ARGS=$@
  27
  28 # Note this also matches compiler-added suffixes like ".cold", etc
  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; } }'