#! /bin/sh
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# Add a .gdb_index section to a file.
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# Copyright (C) 2010-2021 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This program assumes gdb and objcopy are in $PATH.
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# If not, or you want others, pass the following in the environment
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GDB=${GDB:=gdb}
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OBJCOPY=${OBJCOPY:=objcopy}
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READELF=${READELF:=readelf}
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myname="${0##*/}"
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dwarf5=""
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if [ "$1" = "-dwarf-5" ]; then
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dwarf5="$1"
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shift
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fi
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if test $# != 1; then
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echo "usage: $myname [-dwarf-5] FILE" 1>&2
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exit 1
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fi
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file="$1"
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if test ! -r "$file"; then
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echo "$myname: unable to access: $file" 1>&2
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exit 1
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fi
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dir="${file%/*}"
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test "$dir" = "$file" && dir="."
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dwz_file=""
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if $READELF -S "$file" | grep -q " \.gnu_debugaltlink "; then
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dwz_file=$($READELF --string-dump=.gnu_debugaltlink "$file" \
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| grep -A1 "'\.gnu_debugaltlink':" \
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| tail -n +2 \
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| sed 's/.*]//')
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dwz_file=$(echo $dwz_file)
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if $READELF -S "$dwz_file" | grep -E -q " \.(gdb_index|debug_names) "; then
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# Already has an index, skip it.
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dwz_file=""
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fi
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fi
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set_files ()
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{
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local file="$1"
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index4="${file}.gdb-index"
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index5="${file}.debug_names"
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debugstr="${file}.debug_str"
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debugstrmerge="${file}.debug_str.merge"
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debugstrerr="${file}.debug_str.err"
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}
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tmp_files=
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for f in "$file" "$dwz_file"; do
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if [ "$f" = "" ]; then
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continue
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fi
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set_files "$f"
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tmp_files="$tmp_files $index4 $index5 $debugstr $debugstrmerge $debugstrerr"
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done
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rm -f $tmp_files
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# Ensure intermediate index file is removed when we exit.
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trap "rm -f $tmp_files" 0
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$GDB --batch -nx -iex 'set auto-load no' \
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-ex "file $file" -ex "save gdb-index $dwarf5 $dir" || {
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# Just in case.
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status=$?
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echo "$myname: gdb error generating index for $file" 1>&2
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exit $status
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}
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# In some situations gdb can exit without creating an index. This is
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# not an error.
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# E.g., if $file is stripped. This behaviour is akin to stripping an
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# already stripped binary, it's a no-op.
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status=0
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handle_file ()
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{
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local file
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file="$1"
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set_files "$file"
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if test -f "$index4" -a -f "$index5"; then
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echo "$myname: Both index types were created for $file" 1>&2
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status=1
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elif test -f "$index4" -o -f "$index5"; then
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if test -f "$index4"; then
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index="$index4"
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section=".gdb_index"
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else
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index="$index5"
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section=".debug_names"
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fi
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debugstradd=false
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debugstrupdate=false
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if test -s "$debugstr"; then
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if ! $OBJCOPY --dump-section .debug_str="$debugstrmerge" "$file" \
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/dev/null 2>$debugstrerr; then
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cat >&2 $debugstrerr
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exit 1
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fi
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if grep -q "can't dump section '.debug_str' - it does not exist" \
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$debugstrerr; then
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debugstradd=true
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else
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debugstrupdate=true
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cat >&2 $debugstrerr
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fi
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cat "$debugstr" >>"$debugstrmerge"
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fi
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$OBJCOPY --add-section $section="$index" \
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--set-section-flags $section=readonly \
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$(if $debugstradd; then \
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echo --add-section .debug_str="$debugstrmerge"; \
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echo --set-section-flags .debug_str=readonly; \
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fi; \
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if $debugstrupdate; then \
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echo --update-section .debug_str="$debugstrmerge"; \
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fi) \
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"$file" "$file"
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status=$?
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else
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echo "$myname: No index was created for $file" 1>&2
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echo "$myname: [Was there no debuginfo? Was there already an index?]" \
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1>&2
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fi
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}
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handle_file "$file"
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if [ "$dwz_file" != "" ]; then
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handle_file "$dwz_file"
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fi
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exit $status
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