160 lines
4.2 KiB
Bash
160 lines
4.2 KiB
Bash
#!/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 -ex
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ldso_tmp="$(mktemp)"
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libc_tmp="$(mktemp)"
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libdl_tmp="$(mktemp)"
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libpthread_tmp="$(mktemp)"
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librt_tmp="$(mktemp)"
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# Prefer a separately installed debugedit over the RPM-integrated one.
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if command -v debugedit >/dev/null ; then
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debugedit=debugedit
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else
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debugedit=/usr/lib/rpm/debugedit
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fi
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cleanup () {
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rm -f "$ldso_tmp" "$libc_tmp" "$libdl_tmp" "$libpthread_tmp" "$librt_tmp"
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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="$1"
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shift
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# See run_ldso setting in glibc.spec.
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ldso_path=
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for ldso_candidate in `find "$sysroot_path" -name 'ld-*.so' -type f` ; do
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if test -z "$ldso_path" ; then
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ldso_path="$ldso_candidate"
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else
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echo "error: multiple ld.so candidates: $ldso_path, $ldso_candidate"
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exit 1
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fi
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done
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libc_path=
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for libc_candidate in `find "$sysroot_path" -name 'libc-*.so' -type f` ; do
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if test -z "$libc_path" ; then
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libc_path="$libc_candidate"
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else
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echo "error: multiple libc.so.6 candidates: $libc_path, $libc_candidate"
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exit 1
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fi
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done
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libdl_path=
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for libdl_candidate in `find "$sysroot_path" -name 'libdl-*.so' -type f` ; do
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if test -z "$libdl_path" ; then
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libdl_path="$libdl_candidate"
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else
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echo "error: multiple libdl.so.6 candidates: $libdl_path, $libdl_candidate"
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exit 1
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fi
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done
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libpthread_path=
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for libpthread_candidate in `find "$sysroot_path" -name 'libpthread-*.so' -type f` ; do
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if test -z "$libpthread_path" ; then
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libpthread_path="$libpthread_candidate"
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else
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echo "error: multiple libpthread.so.6 candidates: $libpthread_path, $libpthread_candidate"
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exit 1
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fi
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done
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librt_path=
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for librt_candidate in `find "$sysroot_path" -name 'librt-*.so' -type f` ; do
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if test -z "$librt_path" ; then
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librt_path="$librt_candidate"
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else
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echo "error: multiple librt.so.6 candidates: $librt_path, $librt_candidate"
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exit 1
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fi
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done
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# Preserve the original files.
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cp "$ldso_path" "$ldso_tmp"
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cp "$libc_path" "$libc_tmp"
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cp "$libdl_path" "$libdl_tmp"
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cp "$libpthread_path" "$libpthread_tmp"
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cp "$librt_path" "$librt_tmp"
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# Run the debuginfo extraction.
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"$script_path" "$@"
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# Restore the original files.
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cp "$ldso_tmp" "$ldso_path"
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cp "$libc_tmp" "$libc_path"
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cp "$libdl_tmp" "$libdl_path"
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cp "$libpthread_tmp" "$libpthread_path"
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cp "$librt_tmp" "$librt_path"
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# Reduce the size of notes. Primarily for annobin.
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objcopy --merge-notes "$ldso_path"
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objcopy --merge-notes "$libc_path"
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objcopy --merge-notes "$libdl_path"
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objcopy --merge-notes "$libpthread_path"
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objcopy --merge-notes "$librt_path"
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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 "$libc_path" "$libdl_path" "$libpthread_path" "$librt_path"; 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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"$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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$debugedit -b "$debug_base_name" -d "$debug_dest_name" -n $ldso_path
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# Apply single-file DWARF optimization.
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dwz $ldso_path
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