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> [<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> [<func> ...]" >&2
  17         exit 1
  18 }
  19
  20 [[ $# -lt 2 ]] && usage
  21
  22 OBJ=$1; shift
  23 FUNCS=("$@")
  24
  25 ${OBJDUMP} -wdr $OBJ | gawk -M -v _funcs="${FUNCS[*]}" '
  26         BEGIN { split(_funcs, funcs); }
  27         /^$/ { func_match=0; }
  28         /<.*>:/ {
  29                 f = gensub(/.*<(.*)>:/, "\\1", 1);
  30                 for (i in funcs) {
  31                         # match compiler-added suffixes like ".cold", etc
  32                         if (f ~ "^" funcs[i] "(\\..*)?") {
  33                                 func_match = 1;
  34                                 base = strtonum("0x" $1);
  35                                 break;
  36                         }
  37                 }
  38         }
  39         {
  40                 if (func_match) {
  41                         addr = strtonum("0x" $1);
  42                         printf("%04x ", addr - base);
  43                         print;
  44                 }
  45         }'