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