1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
# Expect script for linker support of IFUNC symbols and relocations.
#
# Copyright 2009 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 <nickc@redhat.com>
# IFUNC support has only been implemented for the x86_64 and ix86 so far.
if {! ( [istarget "x86_64-*-elf*"]
|| [istarget "x86_64-*-linux*"]
|| [istarget "i?86-*-elf*"]
|| [istarget "i?86-*-linux*"]) } {
verbose "IFUNC tests not run - target does not support IFUNC"
return
}
# We need a native system. FIXME: Strictly speaking this
# is not true, we just need to know how to create a fully
# linked executable, including the C and Z libraries, using
# the linker that is under test.
if ![isnative] {
verbose "IFUNC tests not run - not a native toolchain"
return
}
# We need a working compiler. (Strictly speaking this is
# not true, we could use target specific assembler files).
if { [which $CC] == 0 } {
verbose "IFUNC 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 IFUNC symbol.
# Returns -1 upon error, 0 if the symbol was not found and 1 if it was found.
proc contains_ifunc_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_ifunc_symbol: Readelf produced unexpected out processing $binary_file: $got"
return -1
}
# Look for a line like this:
# 58: 0000000000400600 30 IFUNC GLOBAL DEFAULT 12 library_func2
if { ![regexp ".*\[ \]*IFUNC\[ \]+GLOBAL\[ \]+DEFAULT\[ \]+\[UND0-9\]+\[ \]+library_func2\n" [file_contents readelf.out]] } {
return 0
}
return 1
}
# A procedure to confirm that a file contains a relocation that references an IFUNC symbol.
# Returns -1 upon error, 0 if the reloc was not found and 1 if it was found.
proc contains_ifunc_reloc { binary_file } {
global READELF
global READELFFLAGS
catch "exec $READELF $READELFFLAGS --relocs $binary_file > readelf.out" got
if ![string match "" $got] then {
verbose "proc contains_ifunc_reloc: Readelf produced unexpected out processing $binary_file: $got"
return -1
}
if [string match "" [file_contents readelf.out]] then {
verbose "No relocs found in $binary_file"
return 0
}
if { ![regexp "\\(\\)" [file_contents readelf.out]] } {
return 0
}
return 1
}
set fails 0
# Create the object files, libraries and executables.
if ![ld_compile "$CC -c -shared -fPIC" "$srcdir/$subdir/prog.c" "tmpdir/shared_prog.o"] {
fail "Could not create a shared object file"
set fails [expr $fails + 1]
}
if ![ld_compile "$CC -c -static" "$srcdir/$subdir/prog.c" "tmpdir/static_prog.o"] {
fail "Could not create a static object file"
set fails [expr $fails + 1]
}
if ![ld_compile "$CC -c -shared -fPIC -DWITH_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/shared_ifunc.o"] {
fail "Could not create an object file containing an IFUNC symbol"
set fails [expr $fails + 1]
}
if ![ld_compile "$CC -c -static -DWITH_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/static_ifunc.o"] {
fail "Could not create a static object file containing an IFUNC symbol"
set fails [expr $fails + 1]
}
if ![ld_compile "$CC -c -static -DWITHOUT_IFUNC" "$srcdir/$subdir/lib.c" "tmpdir/static_noifunc.o"] {
fail "Could not create an ordinary static object file"
set fails [expr $fails + 1]
}
if { $fails != 0 } {
return
}
if ![ld_simple_link $ld "tmpdir/libshared_ifunc.so" "-shared tmpdir/shared_ifunc.o"] {
fail "Could not create a shared library containing an IFUNC symbol"
set fails [expr $fails + 1]
}
if ![ar_simple_create $ar "" "tmpdir/libifunc.a" "tmpdir/static_ifunc.o"] {
fail "Could not create a static library containing an IFUNC symbol"
set fails [expr $fails + 1]
}
if { $fails != 0 } {
return
}
if ![default_ld_link $ld "tmpdir/dynamic_prog" "-Ltmpdir tmpdir/shared_prog.o -Bdynamic -lshared_ifunc -rpath ./tmpdir"] {
fail "Could not link a dynamic executable"
set fails [expr $fails + 1]
}
if ![default_ld_link $ld "tmpdir/static_prog" "-Ltmpdir tmpdir/static_prog.o -lifunc"] {
fail "Could not link a static executable"
set fails [expr $fails + 1]
}
if ![default_ld_link $ld "tmpdir/static_nonifunc_prog" "-Ltmpdir tmpdir/static_prog.o tmpdir/static_noifunc.o"] {
fail "Could not link a non-ifunc using static executable"
set fails [expr $fails + 1]
}
if { $fails == 0 } {
pass "Building ifunc binaries"
set fails 0
} else {
return
}
# Check the executables.
#
# The linked ifunc using executables should have an OSABI field of LINUX
# The linked non-ifunc using executable should have an OSABI field of NONE (aka System V).
if {! [check_osabi tmpdir/static_prog {UNIX - Linux}]} {
fail "Static ifunc-using executable does not have an OS/ABI field of LINUX"
set fails [expr $fails + 1]
}
if {! [check_osabi tmpdir/dynamic_prog {UNIX - Linux}]} {
fail "Dynamic ifunc-using executable does not have an OS/ABI field of LINUX"
set fails [expr $fails + 1]
}
if {! [check_osabi tmpdir/static_nonifunc_prog {UNIX - System V}]} {
fail "Static non-ifunc-using executable does not have an OS/ABI field of System V"
set fails [expr $fails + 1]
}
# The linked ifunc using executables should contain an IFUNC symbol,
# The non-ifunc using executable should not.
if {[contains_ifunc_symbol tmpdir/static_prog] != 1} {
fail "Static ifunc-using executable does not contain an IFUNC symbol"
set fails [expr $fails + 1]
}
if {[contains_ifunc_symbol tmpdir/dynamic_prog] != 1} {
fail "Dynamic ifunc-using executable does not contain an IFUNC symbol"
set fails [expr $fails + 1]
}
if {[contains_ifunc_symbol tmpdir/static_nonifunc_prog] != 0} {
fail "Static non-ifunc-using executable contains an IFUNC symbol"
set fails [expr $fails + 1]
}
# The linked ifunc using executablea should contain a dynamic reloc referencing the IFUNC symbol.
# (Even the static executable which should have a dynamic section created for it).
# The non-ifunc using executable should not.
if {[contains_ifunc_reloc tmpdir/static_prog] != 1} {
fail "Static ifunc-using executable does not contain a reloc against an IFUNC symbol"
set fails [expr $fails + 1]
}
if {[contains_ifunc_reloc tmpdir/dynamic_prog] != 1} {
fail "Dynamic ifunc-using executable does not contain a reloc against an IFUNC symbol"
set fails [expr $fails + 1]
}
if {[contains_ifunc_reloc tmpdir/static_nonifunc_prog] == 1} {
fail "Static non-ifunc-using executable contains a reloc against an IFUNC symbol!"
set fails [expr $fails + 1]
}
if { $fails == 0 } {
pass "Checking ifunc binaries"
}
# Clean up, unless we are being verbose, in which case we leave the files available.
if { $verbose < 1 } {
remote_file host delete "tmpdir/shared_prog.o"
remote_file host delete "tmpdir/static_prog.o"
remote_file host delete "tmpdir/shared_ifunc.o"
remote_file host delete "tmpdir/static_ifunc.o"
remote_file host delete "tmpdir/static_noifunc.o"
remote_file host delete "tmpdir/libshared_ifunc.so"
remote_file host delete "tmpdir/libifunc.a"
remote_file host delete "tmpdir/dynamic_prog"
remote_file host delete "tmpdir/static_prog"
remote_file host delete "tmpdir/static_nonifunc_prog"
}
|
