ld/testsuite/ld-ifunc/ifunc.exp

   1 # Expect script for linker support of IFUNC symbols and relocations.
   2 #
   3 #   Copyright 2009  Free Software Foundation, Inc.
   4 #   Contributed by Red Hat.
   5 #
   6 # This file is part of the GNU Binutils.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write to the Free Software
  20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 # MA 02110-1301, USA.
  22 #
  23 # Written by Nick Clifton <nickc@redhat.com>
  24
  25
  26 # IFUNC support has only been implemented for the x86_64 and ix86 so far.
  27 if {! (  [istarget "x86_64-*-elf*"]
  28       || [istarget "x86_64-*-linux*"]
  29       || [istarget "i?86-*-elf*"]
  30       || [istarget "i?86-*-linux*"]) } {
  31     verbose "IFUNC tests not run - target does not support IFUNC"
  32     return
  33 }
  34
  35 # We need a native system.  FIXME: Strictly speaking this
  36 # is not true, we just need to know how to create a fully
  37 # linked executable, including the C and Z libraries, using
  38 # the linker that is under test.
  39 if ![isnative] {
  40     verbose "IFUNC tests not run - not a native toolchain"
  41     return
  42 }
  43
  44 # We need a working compiler.  (Strictly speaking this is
  45 # not true, we could use target specific assembler files).
  46 if { [which $CC] == 0 } {
  47     verbose "IFUNC tests not run - no compiler available"
  48     return
  49 }
  50
  51 # A procedure to check the OS/ABI field in the ELF header of a binary file.
  52 proc check_osabi { binary_file expected_osabi } {
  53     global READELF
  54     global READELFFLAGS
  55
  56     catch "exec $READELF $READELFFLAGS --file-header $binary_file > readelf.out" got
  57
  58     if ![string match "" $got] then {
  59         verbose "proc check_osabi: Readelf produced unexpected out processing $binary_file: $got"
  60         return 0
  61     }
  62
  63     if { ![regexp "\n\[ \]*OS/ABI:\[ \]*(.+)\n\[ \]*ABI" \
  64            [file_contents readelf.out] nil osabi] } {
  65         verbose "proc check_osabi: Readelf failed to extract an ELF header from $binary_file"
  66         return 0
  67     }
  68
  69     if { $osabi == $expected_osabi } {
  70         return 1
  71     }
  72
  73     verbose "Expected OSABI: $expected_osabi, Obtained osabi: $osabi"
  74
  75     return 0
  76 }
  77
  78 # A procedure to confirm that a file contains the IFUNC symbol.
  79 # Returns -1 upon error, 0 if the symbol was not found and 1 if it was found.
  80 proc contains_ifunc_symbol { binary_file } {
  81     global READELF
  82     global READELFFLAGS
  83
  84     catch "exec $READELF $READELFFLAGS --symbols $binary_file > readelf.out" got
  85
  86     if ![string match "" $got] then {
  87         verbose "proc contains_ifunc_symbol: Readelf produced unexpected out processing $binary_file: $got"
  88         return -1
  89     }
  90
  91     # Look for a line like this:
  92     #    58: 0000000000400600    30 IFUNC   GLOBAL DEFAULT   12 library_func2
  93
  94     if { ![regexp ".*\[ \]*IFUNC\[ \]+GLOBAL\[ \]+DEFAULT\[ \]+\[UND0-9\]+\[ \]+library_func2\n" [file_contents readelf.out]] } {
  95         return 0
  96     }
  97
  98     return 1
  99 }
 100
 101 # A procedure to confirm that a file contains a relocation that references an IFUNC symbol.
 102 # Returns -1 upon error, 0 if the reloc was not found and 1 if it was found.
 103 proc contains_ifunc_reloc { binary_file } {
 104     global READELF
 105     global READELFFLAGS
 106
 107     catch "exec $READELF $READELFFLAGS --relocs $binary_file > readelf.out" got
 108
 109     if ![string match "" $got] then {
 110         verbose "proc contains_ifunc_reloc: Readelf produced unexpected out processing $binary_file: $got"
 111         return -1
 112     }
 113
 114     if [string match "" [file_contents readelf.out]] then {
 115         verbose "No relocs found in $binary_file"
 116         return 0
 117     }
 118
 119     if { ![regexp "\\(\\)" [file_contents readelf.out]] } {
 120         return 0
 121     }
 122
 123     return 1
 124 }
 125
 126 set fails 0
 127
 128 # Create the object files, libraries and executables.
 129 if ![ld_compile "$CC -c -shared -fPIC" "$srcdir/$subdir/prog.c" "tmpdir/shared_prog.o"] {
 130     fail "Could not create a shared object file"
 131     set fails [expr $fails + 1]
 132 }
 133 if ![ld_compile "$CC -c -static" "$srcdir/$subdir/prog.c" "tmpdir/static_prog.o"] {
 134     fail "Could not create a static object file"
 135     set fails [expr $fails + 1]
 136 }
 137 if ![ld_compile "$CC -c -shared -fPIC -DWITH_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/shared_ifunc.o"] {
 138     fail "Could not create an object file containing an IFUNC symbol"
 139     set fails [expr $fails + 1]
 140 }
 141 if ![ld_compile "$CC -c -static -DWITH_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/static_ifunc.o"] {
 142     fail "Could not create a static object file containing an IFUNC symbol"
 143     set fails [expr $fails + 1]
 144 }
 145 if ![ld_compile "$CC -c -static -DWITHOUT_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/static_noifunc.o"] {
 146     fail "Could not create an ordinary static object file"
 147     set fails [expr $fails + 1]
 148 }
 149
 150 if { $fails != 0 } {
 151     return
 152 }
 153
 154 if ![ld_simple_link $ld "tmpdir/libshared_ifunc.so" "-shared tmpdir/shared_ifunc.o"] {
 155     fail "Could not create a shared library containing an IFUNC symbol"
 156     set fails [expr $fails + 1]
 157 }
 158 if ![ar_simple_create $ar "" "tmpdir/libifunc.a" "tmpdir/static_ifunc.o"] {
 159     fail "Could not create a static library containing an IFUNC symbol"
 160     set fails [expr $fails + 1]
 161 }
 162
 163 if { $fails != 0 } {
 164     return
 165 }
 166
 167 if ![default_ld_link $ld "tmpdir/dynamic_prog" "-Ltmpdir tmpdir/shared_prog.o -Bdynamic -lshared_ifunc -rpath ./tmpdir"] {
 168     fail "Could not link a dynamic executable"
 169     set fails [expr $fails + 1]
 170 }
 171 if ![default_ld_link $ld "tmpdir/static_prog" "-Ltmpdir tmpdir/static_prog.o -lifunc"] {
 172     fail "Could not link a static executable"
 173     set fails [expr $fails + 1]
 174 }
 175 if ![default_ld_link $ld "tmpdir/static_nonifunc_prog" "-Ltmpdir tmpdir/static_prog.o tmpdir/static_noifunc.o"] {
 176     fail "Could not link a non-ifunc using static executable"
 177     set fails [expr $fails + 1]
 178 }
 179
 180 if { $fails == 0 } {
 181   pass "Building ifunc binaries"
 182   set fails 0
 183 } else {
 184     return
 185 }
 186
 187 # Check the executables.
 188 #
 189 # The linked ifunc using executables should have an OSABI field of LINUX
 190 # The linked non-ifunc using executable should have an OSABI field of NONE (aka System V).
 191
 192 if {! [check_osabi tmpdir/static_prog {UNIX - Linux}]} {
 193     fail "Static ifunc-using executable does not have an OS/ABI field of LINUX"
 194     set fails [expr $fails + 1]
 195 }
 196 if {! [check_osabi tmpdir/dynamic_prog {UNIX - Linux}]} {
 197     fail "Dynamic ifunc-using executable does not have an OS/ABI field of LINUX"
 198     set fails [expr $fails + 1]
 199 }
 200 if {! [check_osabi tmpdir/static_nonifunc_prog {UNIX - System V}]} {
 201     fail "Static non-ifunc-using executable does not have an OS/ABI field of System V"
 202     set fails [expr $fails + 1]
 203 }
 204
 205 # The linked ifunc using executables should contain an IFUNC symbol,
 206 # The non-ifunc using executable should not.
 207
 208 if {[contains_ifunc_symbol tmpdir/static_prog] != 1} {
 209     fail "Static ifunc-using executable does not contain an IFUNC symbol"
 210     set fails [expr $fails + 1]
 211 }
 212 if {[contains_ifunc_symbol tmpdir/dynamic_prog] != 1} {
 213     fail "Dynamic ifunc-using executable does not contain an IFUNC symbol"
 214     set fails [expr $fails + 1]
 215 }
 216 if {[contains_ifunc_symbol tmpdir/static_nonifunc_prog] != 0} {
 217     fail "Static non-ifunc-using executable contains an IFUNC symbol"
 218     set fails [expr $fails + 1]
 219 }
 220
 221 # The linked ifunc using executablea should contain a dynamic reloc referencing the IFUNC symbol.
 222 # (Even the static executable which should have a dynamic section created for it).
 223 # The non-ifunc using executable should not.
 224
 225 if {[contains_ifunc_reloc tmpdir/static_prog] != 1} {
 226     fail "Static ifunc-using executable does not contain a reloc against an IFUNC symbol"
 227     set fails [expr $fails + 1]
 228 }
 229 if {[contains_ifunc_reloc tmpdir/dynamic_prog] != 1} {
 230     fail "Dynamic ifunc-using executable does not contain a reloc against an IFUNC symbol"
 231     set fails [expr $fails + 1]
 232 }
 233 if {[contains_ifunc_reloc tmpdir/static_nonifunc_prog] == 1} {
 234     fail "Static non-ifunc-using executable contains a reloc against an IFUNC symbol!"
 235     set fails [expr $fails + 1]
 236 }
 237
 238 if { $fails == 0 } {
 239   pass "Checking ifunc binaries"
 240 }
 241
 242 # Clean up, unless we are being verbose, in which case we leave the files available.
 243 if { $verbose < 1 } {
 244     remote_file host delete "tmpdir/shared_prog.o"
 245     remote_file host delete "tmpdir/static_prog.o"
 246     remote_file host delete "tmpdir/shared_ifunc.o"
 247     remote_file host delete "tmpdir/static_ifunc.o"
 248     remote_file host delete "tmpdir/static_noifunc.o"
 249     remote_file host delete "tmpdir/libshared_ifunc.so"
 250     remote_file host delete "tmpdir/libifunc.a"
 251     remote_file host delete "tmpdir/dynamic_prog"
 252     remote_file host delete "tmpdir/static_prog"
 253     remote_file host delete "tmpdir/static_nonifunc_prog"
 254 }