1 # Copyright (C) 2010-2014 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} {
22 set tmp [standard_output_file section_get.tmp]
23 set objcopy_program [gdb_find_objcopy]
25 set command "exec $objcopy_program -O binary --set-section-flags $section=A --change-section-address $section=0 -j $section $exec $tmp"
26 verbose -log "command is $command"
27 set result [catch $command output]
28 verbose -log "result is $result"
29 verbose -log "output is $output"
34 fconfigure $fi -translation binary
38 # .interp has size $len + 1 but .gnu_debuglink contains garbage after \000.
39 set len [string first \000 $data]
41 verbose -log "section $section not found"
44 set retval [string range $data 0 [expr $len - 1]]
45 verbose -log "section $section is <$retval>"
51 proc symlink_resolve {file} {
53 while {[file type $file] == "link"} {
54 set target [file readlink $file]
55 if {[file pathtype $target] == "relative"} {
56 set src2 [file dirname $file]/$target
60 verbose -log "Resolved symlink $file targetting $target as $src2"
63 set loop [expr $loop + 1]
65 fail "Looping symlink resolution for $file"
72 # Copy SRC to DEST, resolving any symlinks in SRC. Return nonzero iff
73 # the copy was succesful.
75 # This function is guaranteed to never raise any exception, even when the copy
78 proc file_copy {src dest} {
79 set src [symlink_resolve $src]
80 # Test name would contain unstable directory name for symlink-unresolved
82 set test "copy [file tail $src] to [file tail $dest]"
83 set command "file copy -force -- $src $dest"
84 verbose -log "command is $command"
94 # Wrap function build_executable so that the resulting executable is fully
95 # self-sufficient (without dependencies on system libraries). Parameter
96 # INTERP may be used to specify a loader (ld.so) to be used that is
97 # different from the default system one. INTERP can be set to "no" if no ld.so
98 # copy should be made. Libraries on which the executable depends are copied
99 # into directory DIR. Default DIR value to
100 # `${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 [standard_output_file ${executable}]
126 set ldd [gdb_find_ldd]
127 set command "$ldd $binfile"
128 set test "ldd $executable"
129 set result [catch "exec $command" output]
130 verbose -log "result of $command is $result"
131 verbose -log "output of $command is $output"
132 if {$result != 0 || $output == ""} {
138 # gdb testsuite will put there also needless -lm.
139 set test "$test output contains libs"
140 set libs [regexp -all -inline -line {^.* => (/[^ ]+).*$} $output]
141 if {[llength $libs] == 0} {
150 file delete -force -- $dir
154 set interp_system [section_get $binfile .interp]
155 if {$interp_system == ""} {
156 fail "$test could not find .interp"
158 set interp ${dir}/[file tail $interp_system]
159 file_copy $interp_system $interp
162 if {$interp == "no"} {
167 foreach {trash abspath} $libs {
168 set dest "$dir/[file tail $abspath]"
169 file_copy $abspath $dest
173 # Do not lappend it so that "-rpath $dir" overrides any possible "-rpath"s
174 # specified by the caller to be able to link it for ldd" above.
175 set options [linsert $options 0 "ldflags=-Wl,-rpath,$dir"]
177 set options [linsert $options 0 "ldflags=-Wl,--dynamic-linker,$interp"]
180 if {[build_executable $testname $executable $sources $options] == -1} {
184 set prelink_args "--ld-library-path=$dir $binfile [concat $dests]"
186 set prelink_args "--dynamic-linker=$interp $prelink_args $interp"
191 # Unprelink ARG. Reported test name can be specified by NAME. Return non-zero
192 # on success, zero on failure.
194 proc prelink_no {arg {name {}}} {
196 set name [file tail $arg]
198 set test "unprelink $name"
199 set command "exec /usr/sbin/prelink -uN $arg"
200 verbose -log "command is $command"
201 set result [catch $command output]
202 verbose -log "result is $result"
203 verbose -log "output is $output"
204 if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
205 # Without prelink, at least verify that all the binaries do not
206 # contain the ".gnu.prelink_undo" section (which would mean that they
207 # have already been prelinked).
208 set test "$test (missing /usr/sbin/prelink)"
209 foreach bin [split $arg] {
210 if [string match "-*" $bin] {
211 # Skip prelink options.
214 set readelf_program [gdb_find_readelf]
215 set command "exec $readelf_program -WS $bin"
216 verbose -log "command is $command"
217 set result [catch $command output]
218 verbose -log "result is $result"
219 verbose -log "output is $output"
220 if {$result != 0 || [string match {* .gnu.prelink_undo *} $output]} {
221 fail "$test ($bin is already prelinked)"
228 if {$result == 0 && $output == ""} {
229 verbose -log "$name has been now unprelinked"
230 set command "exec /usr/sbin/prelink -uN $arg"
231 verbose -log "command is $command"
232 set result [catch $command output]
233 verbose -log "result is $result"
234 verbose -log "output is $output"
236 # Last line does miss the trailing \n. There can be multiple such messages
237 # as ARG may list multiple files.
238 if {$result == 1 && [regexp {^([^\r\n]*prelink[^\r\n]*: [^ ]* does not have .gnu.prelink_undo section\n?)*$} $output]} {
247 # Prelink ARG. Reported test name can be specified by NAME. Return non-zero
248 # on success, zero on failure.
250 proc prelink_yes {arg {name ""}} {
252 set name [file tail $arg]
255 # Try to unprelink it first so that, if it has been already prelinked
256 # before, we get a different address now, making the new result unaffected
257 # by any previous prelinking.
258 if ![prelink_no $arg "$name pre-unprelink"] {
262 set test "prelink $name"
264 # `--no-exec-shield' is for i386, where prelink in the exec-shield mode is
265 # forced to push all the libraries tight together, in order to fit into
266 # the first two memory areas (either the ASCII Shield area or at least
267 # below the executable). If the prelink was performed in exec-shield
268 # mode, prelink could have no choice on how to randomize the single new
269 # unprelinked library address without wasting space in the first one/two
270 # memory areas. In such case prelink could place $ARG repeatedly at the
271 # same place and we could have false prelink results on
272 # gdb.base/prelink.exp and others. To prevent this from happening, we use
273 # the --no-exec-shield switch. This may have some consequences in terms
274 # of security, but we do not care in our case.
276 set command "exec /usr/sbin/prelink -qNR --no-exec-shield $arg"
278 verbose -log "command is $command"
279 set result [catch $command output]
280 verbose -log "result is $result"
281 verbose -log "output is $output"
282 if {$result == 1 && [regexp {^(couldn't execute "/usr/sbin/prelink[^\r\n]*": no such file or directory\n?)*$} $output]} {
283 set test "$test (missing /usr/sbin/prelink)"
285 # We could not find prelink. We could check whether $args is already
286 # prelinked but we don't, because:
287 # - It is unlikely that someone uninstalls prelink after having
288 # prelinked the system ld.so;
289 # - We still cannot change its prelinked address.
290 # Therefore, we just skip the test.
295 if {$result == 1 && [regexp {DWARF [^\r\n]* unhandled} $output]} {
296 # Prelink didn't understand the version of dwarf present.
297 unsupported "$test (dwarf version unhandled)"
300 if {$result == 0 && $output == ""} {
303 } elseif {$result == 1 \
304 && [string match -nocase "*: Not enough room to add .dynamic entry" $output]} {
305 # Linker should have reserved some entries for prelink.