# Expect script for linker support of STB_GNU_UNIQUE symbols # # Copyright (C) 2009-2020 Free Software Foundation, Inc. # Contributed by Red Hat. # # This file is part of the GNU Binutils. # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, # MA 02110-1301, USA. # # Written by Nick Clifton # Adapted for unique checking by Mark J. Wielaard # Exclude non-ELF targets. if { ![is_elf_format] } { return } # Require STB_GNU_UNIQUE support with OSABI set to GNU. if { ![supports_gnu_unique] || [istarget tic6x-*-*] } { verbose "UNIQUE tests not run - target does not support UNIQUE" return } set test_list [lsort [glob -nocomplain $srcdir/$subdir/*.d]] foreach t $test_list { # We need to strip the ".d", but can leave the dirname. verbose [file rootname $t] run_dump_test [file rootname $t] } # We need a working compiler. (Strictly speaking this is # not true, we could use target specific assembler files). if { ![check_compiler_available] } { verbose "UNIQUE compiled tests not run - no compiler available" return } # A procedure to check the OS/ABI field in the ELF header of a binary file. proc check_osabi { binary_file expected_osabi } { global READELF global READELFFLAGS catch "exec $READELF $READELFFLAGS --file-header $binary_file > readelf.out" got if ![string match "" $got] then { verbose "proc check_osabi: Readelf produced unexpected out processing $binary_file: $got" return 0 } if { ![regexp "\n\[ \]*OS/ABI:\[ \]*(.+)\n\[ \]*ABI" \ [file_contents readelf.out] nil osabi] } { verbose "proc check_osabi: Readelf failed to extract an ELF header from $binary_file" return 0 } if { $osabi == $expected_osabi } { return 1 } verbose "Expected OSABI: $expected_osabi, Obtained osabi: $osabi" return 0 } # A procedure to confirm that a file contains the UNIQUE symbol. # Returns -1 upon error, 0 if the symbol was not found and 1 if it was found. proc contains_unique_symbol { binary_file } { global READELF global READELFFLAGS catch "exec $READELF $READELFFLAGS --symbols $binary_file > readelf.out" got if ![string match "" $got] then { verbose "proc contains_unique_symbol: Readelf produced unexpected out processing $binary_file: $got" return -1 } # Look for a line like this: # 54: 0000000000400474 4 OBJECT UNIQUE DEFAULT 13 a if { ![regexp ".*\[ \]*OBJECT\[ \]+UNIQUE\[ \]+DEFAULT\[ \]+\[UND0-9\]+\[ \]+\[ab\]_val\n" [file_contents readelf.out]] } { return 0 } return 1 } set fails 0 # Create object file containing unique symbol. if ![ld_compile "$CC -c" "$srcdir/$subdir/unique.s" "tmpdir/unique.o"] { fail "Could not create a unique object" set fails [expr $fails + 1] } # Create object file NOT containing unique symbol. if ![ld_compile "$CC -c" "$srcdir/$subdir/unique_empty.s" "tmpdir/unique_empty.o"] { fail "Could not create a non-unique object" set fails [expr $fails + 1] } # When using GCC as the linker driver, we need to specify board cflags when # linking because cflags may contain linker options. For example when linker # options are included in GCC spec files then we need the -specs option. if [board_info [target_info name] exists cflags] { set board_cflags " [board_info [target_info name] cflags]" } else { set board_cflags "" } # Create executable containing unique symbol. if ![ld_link "$CC $NOPIE_LDFLAGS $board_cflags" "tmpdir/unique_prog" "tmpdir/unique.o"] { fail "Could not link a unique executable" set fails [expr $fails + 1] } if { $fails != 0 } { return } # Check the object file. if {! [check_osabi tmpdir/unique.o {UNIX - GNU}]} { fail "Object containing unique does not have an OS/ABI field of GNU" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/unique.o] != 1} { fail "Object containing unique does not contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking unique object" } # Check the executable. if {! [check_osabi tmpdir/unique_prog {UNIX - GNU}]} { fail "Executable containing unique does not have an OS/ABI field of GNU" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/unique_prog] != 1} { fail "Executable containing unique does not contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking unique executable" } # Check the empty object file. switch -glob $target_triplet { hppa*-*-linux* { set expected_none {UNIX - GNU} } default { set expected_none {UNIX - System V} } } if {! [check_osabi tmpdir/unique_empty.o $expected_none]} { fail "Object NOT containing unique does not have an OS/ABI field of $expected_none" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/unique_empty.o] == 1} { fail "Object NOT containing unique does contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking empty unique object" } # ------------------------------------------------------------------------------ # Only shared library tests below. # ------------------------------------------------------------------------------ if { ![check_shared_lib_support] } { return } # Create pic object file containing unique symbol. if {![ld_compile "$CC -c -fPIC" "$srcdir/$subdir/unique_shared.s" "tmpdir/unique_shared.o"] } { fail "Could not create a pic unique object" set fails [expr $fails + 1] } # Create shared library containing unique symbol. if {![ld_link $ld "tmpdir/libunique_shared.so" "-shared tmpdir/unique_shared.o"] } { fail "Could not create a shared library containing an unique symbol" set fails [expr $fails + 1] } # Create executable NOT containing unique symbol linked against library. if {![ld_link "$CC $NOPIE_LDFLAGS $board_cflags" "tmpdir/unique_shared_prog" "-Ltmpdir tmpdir/unique_empty.o -Wl,-Bdynamic,-rpath=./tmpdir -lunique_shared"] } { fail "Could not link a dynamic executable" set fails [expr $fails + 1] } # Create shared library containing unique symbol with reference. if {![ld_link $ld "tmpdir/libunique_shared_ref.so" "-shared -z notext tmpdir/unique_shared.o tmpdir/unique_empty.o"] } { fail "Could not create a shared library containing an unique symbol with reference" set fails [expr $fails + 1] } if { $fails != 0 } { return } # Check the unique PIC file. if {! [check_osabi tmpdir/unique_shared.o {UNIX - GNU}]} { fail "PIC Object containing unique does not have an OS/ABI field of GNU" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/unique_shared.o] != 1} { fail "PIC Object containing unique does not contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking unique PIC object 1" } # Check the unique shared library. if {! [check_osabi tmpdir/libunique_shared.so {UNIX - GNU}]} { fail "Shared library containing unique does not have an OS/ABI field of GNU" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/libunique_shared.so] != 1} { fail "Shared library containing unique does not contain an UNIQUE symbol" set fails [expr $fails + 1] } # Check the unique shared library with reference. if {! [check_osabi tmpdir/libunique_shared_ref.so {UNIX - GNU}]} { fail "Shared library containing unique with reference does not have an OS/ABI field of GNU" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/libunique_shared_ref.so] != 1} { fail "Shared library containing unique with reference does not contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking unique PIC object 2" } # Check the empty executable linked against unique shared library. if {! [check_osabi tmpdir/unique_shared_prog $expected_none]} { fail "Executable NOT containing unique does not have an OS/ABI field of $expected_none" set fails [expr $fails + 1] } if {[contains_unique_symbol tmpdir/unique_shared_prog] == 1} { fail "Executable NOT containing unique does contain an UNIQUE symbol" set fails [expr $fails + 1] } if { $fails == 0 } { pass "Checking shared empty executable" }