glibc/wrap-find-debuginfo.sh

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#!/bin/bash
# Wrapper script for find-debuginfo.sh
#
# Usage:
# wrap-find-debuginfo.sh SYSROOT-PATH SCRIPT-PATH SCRIPT-ARGS...
#
# The wrapper saves the original version of ld.so found in SYSROOT-PATH,
# invokes SCRIPT-PATH with SCRIPT-ARGS, and then restores the
# LDSO-PATH file, followed by note merging and DWZ compression.
# As a result, ld.so has (mostly) unchanged debuginfo even
# after debuginfo extraction.
#
# For libc.so.6 and other shared objects, a set of strategic symbols
# is preserved in .symtab that are frequently used in valgrind
# suppressions and elsewhere.
set -evx
tar_tmp="$(mktemp)"
declare -A libc_dlink_tmp_list
ldso_annobin_sym_tmp_list=""
# Prefer a separately installed debugedit over the RPM-integrated one.
if command -v debugedit >/dev/null ; then
debugedit=debugedit
else
debugedit=/usr/lib/rpm/debugedit
fi
cleanup () {
rm -f "$tar_tmp" ${libc_dlink_tmp_list[@]} $ldso_annobin_sym_tmp_list
}
trap cleanup 0
sysroot_path="$1"
shift
script_path="$1"
shift
# See run_ldso setting in glibc.spec.
ldso_list=`cd "$sysroot_path"; find . -name 'ld-*.so' -type f`
libc_list=`cd "$sysroot_path"; find . -name 'libc-*.so' -type f`
libdl_list=`cd "$sysroot_path"; find . -name 'libdl-*.so' -type f`
libpthread_list=`cd "$sysroot_path"; find . -name 'libpthread-*.so' -type f`
librt_list=`cd "$sysroot_path"; find . -name 'librt-*.so' -type f`
full_list="$ldso_list $libc_list $libdl_list $libpthread_list $librt_list"
# Preserve the original files.
(cd "$sysroot_path"; ls -l $full_list)
(cd "$sysroot_path"; tar cvf "$tar_tmp" $full_list)
# Run the debuginfo extraction.
"$script_path" "$@"
# libc.so.6: Extract the .gnu_debuglink section
for f in $libc_list
do
dlink_tmp="$(mktemp)"
libc_dlink_tmp_list["$f"]="$dlink_tmp"
objcopy -j.gnu_debuglink --set-section-flags .gnu_debuglink=alloc \
-O binary "$sysroot_path/$f" "$dlink_tmp"
done
# Restore the original files.
(cd "$sysroot_path"; tar xf "$tar_tmp")
(cd "$sysroot_path"; ls -l $full_list)
# Reduce the size of notes. Primarily for annobin.
for p in $full_list
do
objcopy --merge-notes "$sysroot_path/$p"
done
# libc.so.6: Restore the .gnu_debuglink section
for f in ${!libc_dlink_tmp_list[@]}
do
dlink_tmp="${libc_dlink_tmp_list[$f]}"
objcopy --add-section .gnu_debuglink="$dlink_tmp" "$sysroot_path/$f"
done
# ld.so does not have separated debuginfo and so the debuginfo file
# generated by find-debuginfo is redundant. Therefore, remove it.
for ldso_debug in `find "$sysroot_path" -name 'ld-*.so*.debug' -type f`
do
rm -f "$ldso_debug"
done
# libc.so.6 and other shared objects: Reduce to valuable symbols.
# Eliminate file symbols, annobin symbols, and symbols used by the
# glibc build to implement hidden aliases (__EI_*). We would also
# like to remove __GI_* symbols, but even listing them explicitly (as
# in -K __GI_strlen) still causes strip to remove them, so there is no
# filtering of __GI_* here. (Debuginfo is gone after this, so no need
# to optimize it.)
for p in $libc_list $libdl_list $libpthread_list $librt_list ; do
strip -w \
-K '*' \
-K '!*.c' \
-K '!*.os' \
-K '!.annobin_*' \
-K '!__EI_*' \
-K '!__PRETTY_FUNCTION__*' \
"$sysroot_path/$p"
done
# ld.so: Rewrite the source file paths to match the extracted
# locations. First compute the arguments for invoking debugedit.
# See find-debuginfo.sh.
debug_dest_name="/usr/src/debug"
last_arg=
while true ; do
arg="$1"
shift || break
case "$arg" in
(--unique-debug-src-base)
debug_dest_name="/usr/src/debug/$1"
shift
;;
(-*)
;;
(*)
last_arg="$arg"
;;
esac
done
debug_base_name=${last_arg:-$RPM_BUILD_ROOT}
for p in $ldso_list
do
$debugedit -b "$debug_base_name" -d "$debug_dest_name" -n "$sysroot_path/$p"
# Remove the .annobin* symbols (and only them).
ldso_annobin_sym_tmp="$(mktemp)"
ldso_annobin_sym_tmp_list+=" $ldso_annobin_sym_tmp"
if nm --format=posix "$sysroot_path/$p" | cut -d' ' -f1 \
| grep '^\.annobin' > "$ldso_annobin_sym_tmp"; then
objcopy --strip-symbols="$ldso_annobin_sym_tmp" "$sysroot_path/$p"
fi
done
# Apply single-file DWARF optimization.
for ldso in $ldso_list
do
dwz "$sysroot_path/$p"
done