mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-23 14:42:26 +00:00
353 lines
10 KiB
Plaintext
Executable File
353 lines
10 KiB
Plaintext
Executable File
#!@@CT_bash@@
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# NON-CONFIGURABLE STUFF!
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export LC_ALL=C
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version="@@CT_VERSION@@"
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bits="@@CT_BITS@@"
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sed="@@CT_sed@@"
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grep="@@CT_grep@@"
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my_name="$( basename "${0}" )"
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prefix="${0%-ldd}"
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gcc="${prefix}-gcc"
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readelf="${prefix}-readelf"
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fake_load_addr_root="$((0xdeadbeef))"
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fake_load_addr_rpath="$((0xdeadc0de))"
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fake_load_addr_sysroot="$((0x8badf00d))"
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ld_library_path="/lib:/usr/lib"
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do_error() {
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printf "%s: %s\n" "${my_name}" "$*" >&2
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}
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do_opt_error() {
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do_error "$@"
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printf "Try \`%s --help' for more information\n" "${my_name}" >&2
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}
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do_trace() {
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local depth=0
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[ -z "${CT_XLDD_VERBOSE}" ] && return 0
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for((depth=0; "${#FUNCNAME[$((depth+1))]}" != 0; depth++)); do :; done
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printf "%*s" $((4*(depth-1))) "" >&2
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printf -- "$@" >&2
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}
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show_version() {
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# Fake a real ldd, just in case some dumb script would check
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cat <<_EOF_
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ldd (crosstool-NG) ${version}
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Copyright (C) 2010 "Yann E. MORIN" <yann.morin.1998@free.fr>
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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Licensed under the GPLv2, see the file LICENSES in the top-directory of the
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sources for this package.
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_EOF_
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}
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show_help() {
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cat <<_EOF_
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Usage: ${my_name} [OPTION]... --root DIR FILE...
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--help print this help and exit
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--version print version information and exit
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--root dir treat dir as being the root of the target
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-s, --show-system mark libs from the sysroot with a trailing '[*]'
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and libs found via RPATH with a trailing '[+]'
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_EOF_
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cat <<_EOF_ |fmt
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${my_name} tries to mimick the behavior of a real native ldd, but can be
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used in a cross-development environment. Here is how it differs from a
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real native ldd:
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If the CT_XLDD_VERBOSE variable is set and non-empty, then ${my_name} will
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print a lot of debug messages, explaining how it builds the library
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search path, and how each library was found and why.
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The LD_LIBRARY_PATH variable is not used, as it can not reliably be
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guessed except at runtime, and we can't run.
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${my_name} does not scan /etc/ld.so.cache, but instead uses /etc/ld.so.conf
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(it understands the include directives therein for libces that have that).
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${my_name} also interprets (tries to!) the RPATH/RUNPATH records found in
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the dynamic ELF section. Such paths are searched for only relative to
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the specified root, not from the sysroot (see below). Also, those paths
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are searched for not only for the file they appear in, but also for its
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dependencies.
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${my_name} will search the directory specified with --root for libraries
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to resolve the NEEDED tags. If --root is not set, then ${my_name} will
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use the value in the environment variable \${CT_XLDD_ROOT}. If neither
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is set, then this is an error.
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If NEEDED libraries can't be found in the specified root directory, then
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${my_name} will also look in the sysroot of the toolchain to see if it
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can find them.
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For NEEDED libraries that were found, the output will look like:
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libneeded.so => /path/to/libneeded.so (0xloadaddr)
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and for those that were not found, the output will look like:
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libneeded.so not found
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The paths are relative to the specified root directory, or to the sysroot
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(eg. /lib/libneeded.so, /usr/lib/libneeded.so, and so on...).
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The expected load address 'loadaddr' is a faked address to match the output
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of the real ldd, but has no actual meaning (set to some constants for now,
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0x8badf00d for libraries from the sysroot, 0xdeadc0de for those found via
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the RPATH/RUNPATH records, and 0xdeadbeef for others).
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_EOF_
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# Unimplemeted yet:
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# -d, --data-relocs process data relocations
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# -r, --function-relocs process data and function relocations
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# -u, --unused print unused direct dependencies
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# -v, --verbose print all information
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# See also this thread:
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# http://sourceware.org/ml/crossgcc/2008-09/msg00057.html
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}
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# Parse command line options
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root="${CT_XLDD_ROOT}"
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show_system=
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while true; do
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case "${1}" in
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--help)
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show_help
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exit 0
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;;
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--version)
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show_version
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exit 0
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;;
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--root)
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root="$2"
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shift
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;;
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--root=*)
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root="${1#--root=}"
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;;
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--show-system|-s)
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show_system=1
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;;
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-*)
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do_opt_error "unrecognized option \`${1}'"
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exit 1
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;;
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*)
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break
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;;
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esac
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shift
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done
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# Sanity checks
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if [ -z "${root}" ]; then
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do_opt_error "no root given"
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exit 1
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fi
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if [ ! -d "${root}" ]; then
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do_error "\`${root}': no such file or directory"
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exit 1
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fi
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sysroot="$( "${gcc}" -print-sysroot 2>/dev/null )"
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if [ -z "${sysroot}" ]; then
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sysroot="$( "${gcc}" -print-file-name=libc.so 2>/dev/null \
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|sed -r -e 's:/usr/lib/libc.so$::;' \
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)"
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fi
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if [ -z "${sysroot}" ]; then
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do_error "unable to find sysroot for \`${gcc}'"
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fi
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do_report_needed_found() {
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local needed="${1}"
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local path="${2}"
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local origin="${3}"
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local loadaddr
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local sys
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case "${origin}" in
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root)
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loadaddr="${fake_load_addr_root}"
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;;
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rpath)
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loadaddr="${fake_load_addr_rpath}"
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if [ -n "${show_system}" ]; then
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sys=" [+]"
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fi
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;;
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sysroot)
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loadaddr="${fake_load_addr_sysroot}"
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if [ -n "${show_system}" ]; then
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sys=" [*]"
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fi
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;;
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esac
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printf "%8s%s => %s (0x%0*x)%s\n" \
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"" \
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"${needed}" \
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"${path}" \
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"$((bits/4))" \
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"${loadaddr}" \
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"${sys}"
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}
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# Search a needed file, scanning ${lib_dir} in the root directory
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do_find_needed() {
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local needed="${1}"
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local -a list
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local -a dirs
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local found
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local where
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local base
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local d i
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do_trace "Searching for '%s'\n" "${needed}"
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# rpath shall come first!
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list=( \
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"rpath:${root}" \
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"root:${root}" \
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"sysroot:${sysroot}" \
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)
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for i in "${list[@]}"; do
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where="${i%%:*}"
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base="${i#*:}"
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if [ "${where}" = "rpath" ]; then
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dirs=( "${search_rpath[@]}" )
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else
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dirs=( "${needed_search_path[@]}" )
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fi
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for d in "${dirs[@]}"; do
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do_trace "-> looking in '%s' (%s)\n" "${d}" "${where}"
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if [ -f "${base}${d}/${needed}" ]; then
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found="${d}/${needed}"
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do_trace "---> found\n"
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break 2
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fi
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done
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done
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if [ -n "${found}" ]; then
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do_report_needed_found "${needed}" "${found}" "${where}"
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do_process_file "${base}${found}"
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else
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printf "%8s%s not found\n" "" "${needed}"
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fi
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do_trace "Done searching for '%s'\n" "${needed}"
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}
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# Scan a file for all NEEDED tags
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do_process_file() {
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local file="${1}"
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local -a save_search_rpath
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local n m
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local found
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do_trace "Parsing file '%s'\n" "${file}"
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save_search_rpath=( "${search_rpath[@]}" )
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for n in $( "${readelf}" -d "${file}" \
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|"${grep}" -E '\((RPATH|RUNPATH)\)' \
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|"${sed}" -r -e 's/^.*Library r(|un)path:[[:space:]]+\[(.*)\]$/\2/;'\
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); do
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do_trace "-> adding rpath '%s'\n" "${n}"
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search_rpath+=( "${n}" )
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done
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do_trace ": search path:\n"
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for n in "${search_rpath[@]}" "${needed_search_path[@]}"; do
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do_trace ": - '%s'\n" "${n}"
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done
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do_trace ": end search path\n"
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for n in $( "${readelf}" -d "${file}" \
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|"${grep}" -E '\(NEEDED\)' \
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|"${sed}" -r -e 's/^.*Shared library:[[:space:]]+\[([^]]+)\].*/\1/;' \
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); do
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found=0
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for m in "${needed_list[@]}"; do
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[ "${n}" = "${m}" ] && found=1 && break
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done
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if [ ${found} -ne 0 ]; then
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do_trace "-> skipping already known dependency '%s'\n" "${n}"
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continue
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fi
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do_trace "-> handling new dependency '%s'\n" "${n}"
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needed_list+=( "${n}" )
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do_find_needed "${n}"
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do_trace "-> done handling dependency '%s'\n" "${n}"
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done
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search_rpath=( "${save_search_rpath[@]}" )
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do_trace "Finished parsing file '%s'\n" "${file}"
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}
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# Recursively scan a /etc/ld.so.conf file
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do_scan_etc_ldsoconf() {
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local ldsoconf="${1}"
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local g
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local f
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[ -f "${ldsoconf}" ] || return 0
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do_trace "Parsing ld.so.conf: '%s'\n" "${ldsoconf}"
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while read line; do
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case "${line}" in
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include\ *)
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g="${root}${line#include }"
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do_trace "-> handling include directive '%s'\n" "${g}"
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for f in ${g}; do
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do_scan_etc_ldsoconf "${f}"
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done
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do_trace "-> finished handling include directive '%s'\n" "${g}"
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;;
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\#*|"")
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;;
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*)
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do_trace "-> adding search dir '%s'\n" "${line}"
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needed_search_path+=( "${line}" )
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;;
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esac
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done <"${ldsoconf}"
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do_trace "Finished parsing ld.so.conf: '%s'\n" "${ldsoconf}"
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}
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# Build up the full list of search directories
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declare -a needed_search_path
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do_trace "Adding basic lib dirs\n"
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ld_library_path="${ld_library_path}:"
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while [ -n "${ld_library_path}" ]; do
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d="${ld_library_path%%:*}"
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if [ -n "${d}" ]; then
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do_trace "-> adding search dir '%s'\n" "${d}"
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needed_search_path+=( "${d}" )
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fi
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ld_library_path="${ld_library_path#*:}"
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done
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do_trace "Done adding basic lib dirs\n"
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do_trace "Scanning '/etc/ld.so.conf'\n"
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do_scan_etc_ldsoconf "${root}/etc/ld.so.conf"
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do_trace "Done scanning '/etc/ld.so.conf'\n"
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do_trace "Search path:\n"
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for p in "${needed_search_path[@]}"; do
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do_trace "-> '%s'\n" "${p}"
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done
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declare -a needed_list
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declare -a search_rpath
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do_trace "Scanning file '%s'\n" "${1}"
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do_process_file "${1}"
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do_trace "Done scanning file '%s'\n" "${1}"
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