1 # Copyright (C) 2010 Free Software Foundation, Inc.
3 # This program is free software; you can redistribute it and/or modify
4 # it under the terms of the GNU General Public License as published by
5 # the Free Software Foundation; either version 3 of the License, or
6 # (at your option) any later version.
8 # This program is distributed in the hope that it will be useful,
9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 # GNU General Public License for more details.
13 # You should have received a copy of the GNU General Public License
14 # along with this program. If not, see <http://www.gnu.org/licenses/>.
16 # Return nul-terminated string read from section SECTION of EXEC. Return ""
17 # if no such section or nul-terminated string was found. Function is useful
18 # for sections ".interp" or ".gnu_debuglink".
20 proc section_get {exec section} {
23 set tmp "${objdir}/${subdir}/section_get.tmp"
24 set objcopy_program [transform objcopy]
26 set command "exec $objcopy_program -O binary --set-section-flags $section=A --change-section-address $section=0 -j $section $exec $tmp"
27 verbose -log "command is $command"
28 set result [catch $command output]
29 verbose -log "result is $result"
30 verbose -log "output is $output"
35 fconfigure $fi -translation binary
39 # .interp has size $len + 1 but .gnu_debuglink contains garbage after \000.
40 set len [string first \000 $data]
42 verbose -log "section $section not found"
45 set retval [string range $data 0 [expr $len - 1]]
46 verbose -log "section $section is <$retval>"
52 proc symlink_resolve {file} {
54 while {[file type $file] == "link"} {
55 set target [file readlink $file]
56 if {[file pathtype $target] == "relative"} {
57 set src2 [file dirname $file]/$target
61 verbose -log "Resolved symlink $file targetting $target as $src2"
64 set loop [expr $loop + 1]
66 fail "Looping symlink resolution for $file"
73 # Copy SRC to DEST, resolving any symlinks in SRC. Return nonzero iff
74 # the copy was succesful.
76 # This function is guaranteed to never raise any exception, even when the copy
79 proc file_copy {src dest} {
80 set src [symlink_resolve $src]
81 # Test name would contain unstable directory name for symlink-unresolved
83 set test "copy [file tail $src] to [file tail $dest]"
84 set command "file copy -force -- $src $dest"
85 verbose -log "command is $command"
95 # Wrap function build_executable so that the resulting executable is fully
96 # self-sufficient (without dependencies on system libraries). Parameter
97 # INTERP may be used to specify a loader (ld.so) to be used that is
98 # different from the default system one. Libraries on which the executable
99 # depends are copied into directory DIR. Default DIR value to
100 # `${objdir}/${subdir}/${EXECUTABLE}.d'.
102 # In case of success, return a string containing the arguments to be used
103 # in order to perform a prelink of the executable obtained. Return the
104 # empty string in case of failure.
106 # This can be useful when trying to prelink an executable which might
107 # depend on system libraries. To properly prelink an executable, all
108 # of its dynamically linked libraries must be prelinked as well. If
109 # the executable depends on some system libraries, we may not have
110 # sufficient write priviledges on these files to perform the prelink.
111 # This is why we make a copy of these shared libraries, and link the
112 # executable against these copies instead.
114 # Function recognizes only libraries listed by `ldd' after
115 # its ` => ' separator. That means $INTERP and any libraries not being linked
116 # with -Wl,-soname,NAME.so are not copied.
118 proc build_executable_own_libs {testname executable sources options {interp ""} {dir ""}} {
121 if {[build_executable $testname $executable $sources $options] == -1} {
124 set binfile ${objdir}/${subdir}/${executable}
126 set command "ldd $binfile"
127 set test "ldd $executable"
128 set result [catch "exec $command" output]
129 verbose -log "result of $command is $result"
130 verbose -log "output of $command is $output"
131 if {$result != 0 || $output == ""} {
137 # gdb testsuite will put there also needless -lm.
138 set test "$test output contains libs"
139 set libs [regexp -all -inline -line {^.* => (/[^ ]+).*$} $output]
140 if {[llength $libs] == 0} {
149 file delete -force -- $dir
153 set interp_system [section_get $binfile .interp]
154 set interp ${dir}/[file tail $interp_system]
155 file_copy $interp_system $interp
159 foreach {trash abspath} $libs {
160 set dest "$dir/[file tail $abspath]"
161 file_copy $abspath $dest
165 # Do not lappend it so that "-rpath $dir" overrides any possible "-rpath"s
166 # specified by the caller to be able to link it for ldd" above.
167 set options [linsert $options 0 "additional_flags=-Wl,--dynamic-linker,$interp,-rpath,$dir"]
169 if {[build_executable $testname $executable $sources $options] == -1} {
173 set prelink_args "--dynamic-linker=$interp --ld-library-path=$dir $binfile $interp [concat $dests]"
177 # Unprelink ARG. Reported test name can be specified by NAME. Return non-zero
178 # on success, zero on failure.
180 proc prelink_no {arg {name {}}} {
182 set name [file tail $arg]
184 set test "unprelink $name"
185 set command "exec /usr/sbin/prelink -uN $arg"
186 verbose -log "command is $command"
187 set result [catch $command output]
188 verbose -log "result is $result"
189 verbose -log "output is $output"
190 if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
191 # Without prelink, at least verify that all the binaries do not
192 # contain the ".gnu.prelink_undo" section (which would mean that they
193 # have already been prelinked).
194 set test "$test (missing /usr/sbin/prelink)"
195 foreach bin [split $arg] {
196 if [string match "-*" $bin] {
197 # Skip prelink options.
200 set readelf_program [transform readelf]
201 set command "exec $readelf_program -WS $bin"
202 verbose -log "command is $command"
203 set result [catch $command output]
204 verbose -log "result is $result"
205 verbose -log "output is $output"
206 if {$result != 0 || [string match {* .gnu.prelink_undo *} $output]} {
207 fail "$test ($bin is already prelinked)"
214 if {$result == 0 && $output == ""} {
215 verbose -log "$name has been now unprelinked"
216 set command "exec /usr/sbin/prelink -uN $arg"
217 verbose -log "command is $command"
218 set result [catch $command output]
219 verbose -log "result is $result"
220 verbose -log "output is $output"
222 # Last line does miss the trailing \n. There can be multiple such messages
223 # as ARG may list multiple files.
224 if {$result == 1 && [regexp {^(/usr/sbin/prelink[^\r\n]*: [^ ]* does not have .gnu.prelink_undo section\n?)*$} $output]} {
233 # Prelink ARG. Reported test name can be specified by NAME. Return non-zero
234 # on success, zero on failure.
236 proc prelink_yes {arg {name ""}} {
238 set name [file tail $arg]
241 # Try to unprelink it first so that, if it has been already prelinked
242 # before, we get a different address now, making the new result unaffected
243 # by any previous prelinking.
244 if ![prelink_no $arg "$name pre-unprelink"] {
248 set test "prelink $name"
250 # `--no-exec-shield' is for i386, where prelink in the exec-shield mode is
251 # forced to push all the libraries tight together, in order to fit into
252 # the first two memory areas (either the ASCII Shield area or at least
253 # below the executable). If the prelink was performed in exec-shield
254 # mode, prelink could have no choice on how to randomize the single new
255 # unprelinked library address without wasting space in the first one/two
256 # memory areas. In such case prelink could place $ARG repeatedly at the
257 # same place and we could have false prelink results on
258 # gdb.base/prelink.exp and others. To prevent this from happening, we use
259 # the --no-exec-shield switch. This may have some consequences in terms
260 # of security, but we do not care in our case.
262 set command "exec /usr/sbin/prelink -qNR --no-exec-shield $arg"
264 verbose -log "command is $command"
265 set result [catch $command output]
266 verbose -log "result is $result"
267 verbose -log "output is $output"
268 if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
269 set test "$test (missing /usr/sbin/prelink)"
271 # We could not find prelink. We could check whether $args is already
272 # prelinked but we don't, because:
273 # - It is unlikely that someone uninstalls prelink after having
274 # prelinked the system ld.so;
275 # - We still cannot change its prelinked address.
276 # Therefore, we just skip the test.
281 if {$result == 0 && $output == ""} {
284 } elseif {$result == 1 \
285 && [string match -nocase "*: Not enough room to add .dynamic entry" $output]} {
286 # Linker should have reserved some entries for prelink.