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, a set of strategic symbols is preserved in .symtab
# that are frequently used in valgrind suppressions.
set -ex
ldso_tmp="$(mktemp)"
libc_tmp="$(mktemp)"
# 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 "$ldso_tmp" "$libc_tmp"
}
trap cleanup 0
sysroot_path="$1"
shift
script_path="$1"
shift
# See ldso_path setting in glibc.spec.
ldso_path=
for ldso_candidate in `find "$sysroot_path" -regextype posix-extended \
-regex '.*/ld(-.*|64|)\.so\.[0-9]+$' -type f` ; do
if test -z "$ldso_path" ; then
ldso_path="$ldso_candidate"
else
echo "error: multiple ld.so candidates: $ldso_path, $ldso_candidate"
exit 1
fi
done
# libc.so.6 always uses this name, so it is simpler to locate.
libc_path=
for libc_candidate in `find "$sysroot_path" -name libc.so.6`; do
if test -z "$libc_path" ; then
libc_path="$libc_candidate"
else
echo "error: multiple libc.so.6 candidates: $libc_path, $libc_candidate"
exit 1
fi
done
# Preserve the original files.
cp "$ldso_path" "$ldso_tmp"
cp "$libc_path" "$libc_tmp"
# Run the debuginfo extraction.
"$script_path" "$@"
# Restore the original files.
cp "$ldso_tmp" "$ldso_path"
cp "$libc_tmp" "$libc_path"
# Reduce the size of notes. Primarily for annobin.
objcopy --merge-notes "$ldso_path"
objcopy --merge-notes "$libc_path"
# libc.so.6: Reduce to strategic symbols needed by valgrind.
# pthread_create is needed to trigger loading of libthread_db in GDB.
# (Debuginfo is gone after this, so no need to optimize it.)
strip \
-K __GI___rawmemchr \
-K __GI___strcasecmp_l \
-K __GI___strncasecmp_l \
-K __GI_memchr \
-K __GI_memcmp \
-K __GI_memcpy \
-K __GI_memmove \
-K __GI_mempcpy \
-K __GI_stpcpy \
-K __GI_strcasecmp \
-K __GI_strcasecmp_l \
-K __GI_strcat \
-K __GI_strchr \
-K __GI_strcmp \
-K __GI_strcpy \
-K __GI_strcspn \
-K __GI_strlen \
-K __GI_strncasecmp \
-K __GI_strncasecmp_l \
-K __GI_strncmp \
-K __GI_strncpy \
-K __GI_strnlen \
-K __GI_strrchr \
-K __GI_wcsnlen \
-K __GI_wmemchr \
-K __memcmp_sse2 \
-K __memcmp_sse4_1 \
-K __memcpy_avx_unaligned_erms \
-K __memcpy_chk \
-K __memcpy_sse2 \
-K __memmove_chk \
-K __stpcpy_chk \
-K __stpcpy_sse2 \
-K __stpcpy_sse2_unaligned \
-K __strchr_sse2 \
-K __strchr_sse2_no_bsf \
-K __strcmp_sse2 \
-K __strcmp_sse42 \
-K __strcpy_chk \
-K __strlen_sse2 \
-K __strlen_sse2_no_bsf \
-K __strlen_sse42 \
-K __strncmp_sse2 \
-K __strncmp_sse42 \
-K __strncpy_sse2 \
-K __strncpy_sse2_unaligned \
-K __strrchr_sse2 \
-K __strrchr_sse2_no_bsf \
-K __strrchr_sse42 \
-K __strstr_sse2 \
-K __strstr_sse42 \
-K pthread_create \
"$libc_path"
# 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}
$debugedit -b "$debug_base_name" -d "$debug_dest_name" -n $ldso_path
# Apply single-file DWARF optimization.
dwz $ldso_path