1# Copyright 2010-2015 Free Software Foundation, Inc. 2 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. 7# 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. 12# 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/>. 15 16# This test only works on GNU/Linux. 17if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub] 18 || ![istarget *-linux*] || [skip_shlib_tests]} { 19 continue 20} 21 22load_lib prelink-support.exp 23 24set test "break-interp" 25set binprefix [standard_output_file ${test}] 26# Only to get the $interp_system name. 27set srcfile_test "start.c" 28set binfile_test ${test}-test 29set binfile_lib ${binprefix}.so 30set srcfile "${test}-main.c" 31set srcfile_lib "${test}-lib.c" 32 33if [get_compiler_info] { 34 return -1 35} 36 37# Use -soname so that the new library gets copied by build_executable_own_libs. 38 39if {[gdb_compile_shlib ${srcdir}/${subdir}/${srcfile_lib} ${binfile_lib} [list debug ldflags=-Wl,-soname,${test}.so]] != ""} { 40 return -1 41} 42 43if {[build_executable ${test}.exp $binfile_test ${srcfile_test} {}] == -1} { 44 return -1 45} 46 47# Note: The separate debug info file content build-id/crc32 are not verified 48# contrary to the GDB search algorithm skipping non-matching ones. 49proc system_debug_get {exec} { 50 global debug_root 51 52 set exec_build_id_debug [build_id_debug_filename_get $exec] 53 set debug_base "[file tail $exec].debug" 54 set exec_dir [file dirname $exec] 55 56 # isfile returns 1 even for symlinks to files. 57 set retval $debug_root/$exec_build_id_debug 58 if [file isfile $retval] { 59 return $retval 60 } 61 set retval $exec_dir/$debug_base 62 if [file isfile $retval] { 63 return $retval 64 } 65 set retval $exec_dir/.debug/$debug_base 66 if [file isfile $retval] { 67 return $retval 68 } 69 set retval $debug_root/$exec_dir/$debug_base 70 if [file isfile $retval] { 71 return $retval 72 } 73 return "" 74} 75 76gdb_exit 77gdb_start 78set debug_root "" 79set test "show debug-file-directory" 80gdb_test_multiple $test $test { 81 -re "The directory where separate debug symbols are searched for is \"(.*)\".\r\n$gdb_prompt $" { 82 set debug_root $expect_out(1,string) 83 } 84} 85 86set interp_system [section_get [standard_output_file $binfile_test] .interp] 87set interp_system_debug [system_debug_get $interp_system] 88verbose -log "$interp_system has debug $interp_system_debug" 89 90proc prelinkNO {arg {name ""}} { 91 return [prelink_no $arg $name] 92} 93 94proc prelinkYES {arg {name ""}} { 95 return [prelink_yes $arg $name] 96} 97 98proc strip_debug {dest} { 99 set test "strip [file tail $dest]" 100 set strip_program [transform strip] 101 set command "exec $strip_program --strip-debug $dest" 102 verbose -log "command is $command" 103 if [catch $command] { 104 fail $test 105 return 0 106 } else { 107 pass $test 108 return 1 109 } 110} 111 112# The marker function for the standard runtime linker interface is 113# _dl_debug_state. The probes-based interface has no specific marker 114# function; the probe we will stop on (init_start) is in dl_main so we 115# check for that. 116 117set solib_bp {(_dl_debug_state|dl_main)} 118 119# Implementation of reach. 120 121proc reach_1 {func command displacement} { 122 global gdb_prompt expect_out solib_bp 123 124 if {$func == $solib_bp} { 125 # Breakpoint on _dl_debug_state can have problems due to its overlap 126 # with the existing internal breakpoint from GDB. 127 gdb_test_no_output "set stop-on-solib-events 1" 128 } elseif {! [gdb_breakpoint $func allow-pending]} { 129 return 130 } 131 132 set test "reach" 133 set test_displacement "seen displacement message as $displacement" 134 set debug_state_count 0 135 gdb_test_multiple $command $test { 136 -re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " { 137 # Missing "$gdb_prompt $" is intentional. 138 if {$expect_out(1,string) == "0x0"} { 139 set case "ZERO" 140 } else { 141 set case "NONZERO" 142 } 143 if {$displacement == $case || $displacement == "PRESENT"} { 144 pass $test_displacement 145 set displacement "FOUND-$displacement" 146 } else { 147 fail $test_displacement 148 } 149 exp_continue 150 } 151 -re "Breakpoint \[0-9\]+, \\.?(__GI_)?$func \\(.*\\) at .*:\[0-9\]+\r\n.*$gdb_prompt $" { 152 if {$func == $solib_bp} { 153 fail $test 154 } else { 155 pass $test 156 } 157 } 158 -re "Breakpoint \[0-9\]+, \[0-9xa-f\]+ in \\.?(__GI_)?$func \\(\\).*\r\n$gdb_prompt $" { 159 if {$func == $solib_bp} { 160 fail $test 161 } else { 162 pass $test 163 } 164 } 165 -re "Stopped due to (spurious )?shared library event.*\r\n$gdb_prompt $" { 166 if {$func == $solib_bp} { 167 if {$debug_state_count == 0} { 168 # First stop does not yet relocate the _start function 169 # descriptor on ppc64. 170 set debug_state_count 1 171 send_gdb "continue\n" 172 exp_continue 173 } else { 174 pass $test 175 } 176 } else { 177 fail $test 178 } 179 } 180 } 181 if ![regexp {^(NONE|FOUND-.*)$} $displacement] { 182 fail $test_displacement 183 } 184 185 if {$func == $solib_bp} { 186 gdb_test_no_output "set stop-on-solib-events 0" 187 } 188} 189 190# `runto' does not check we stopped really at the function we specified. 191# DISPLACEMENT can be "NONE" for no message to be present, "ZERO" for 192# displacement of 0 bytes to be present, "NONZERO" for displacement of non-0 193# bytes to be present and "PRESENT" if both "ZERO" and "NONZERO" are valid. 194proc reach {func command displacement} { 195 with_test_prefix "reach-$func" { 196 reach_1 $func $command $displacement 197 } 198} 199 200proc test_core {file displacement} { 201 with_test_prefix "core" { 202 global srcdir subdir gdb_prompt expect_out 203 204 set corefile [core_find $file {} "segv"] 205 if {$corefile == ""} { 206 return 207 } 208 209 gdb_exit 210 gdb_start 211 # Clear it to never find any separate debug infos in $debug_root. 212 gdb_test_no_output "set debug-file-directory" \ 213 "set debug-file-directory for core" 214 gdb_reinitialize_dir $srcdir/$subdir 215 gdb_load $file 216 217 # Print the "PIE (Position Independent Executable) displacement" message. 218 gdb_test_no_output "set verbose on" 219 220 set test "core loaded" 221 set test_displacement "seen displacement message as $displacement" 222 gdb_test_multiple "core-file $corefile" $test { 223 -re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " { 224 # Missing "$gdb_prompt $" is intentional. 225 if {$expect_out(1,string) == "0x0"} { 226 set case "ZERO" 227 } else { 228 set case "NONZERO" 229 } 230 if {$displacement == $case || $displacement == "PRESENT"} { 231 pass $test_displacement 232 set displacement "FOUND-$displacement" 233 } else { 234 fail $test_displacement 235 } 236 exp_continue 237 } 238 -re "Core was generated by .*\r\n#0 .*$gdb_prompt $" { 239 # Do not check the binary filename as it may be truncated. 240 pass $test 241 } 242 } 243 if ![regexp {^(NONE|FOUND-.*)$} $displacement] { 244 fail $test_displacement 245 } 246 247 gdb_test "bt" "#\[0-9\]+ +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#\[0-9\]+ +\[^\r\n\]*\\mmain\\M.*" "core main bt" 248 } 249} 250 251proc test_attach_gdb {file pid displacement prefix} { 252 with_test_prefix "$prefix" { 253 global gdb_prompt expect_out 254 255 gdb_exit 256 gdb_start 257 258 # Print the "PIE (Position Independent Executable) displacement" message. 259 gdb_test_no_output "set verbose on" 260 261 gdb_test "file $file" "Reading symbols from .*done\\." "file" 262 263 set test "attach" 264 gdb_test_multiple "attach $pid" $test { 265 -re "Attaching to (program: .*, )?process $pid\r\n" { 266 # Missing "$gdb_prompt $" is intentional. 267 pass $test 268 } 269 } 270 271 set test "attach final prompt" 272 set test_displacement "seen displacement message as $displacement" 273 gdb_test_multiple "" $test { 274 -re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " { 275 # Missing "$gdb_prompt $" is intentional. 276 if {$expect_out(1,string) == "0x0"} { 277 set case "ZERO" 278 } else { 279 set case "NONZERO" 280 } 281 if {$displacement == $case || $displacement == "PRESENT"} { 282 pass $test_displacement 283 set displacement "FOUND-$displacement" 284 } else { 285 fail $test_displacement 286 } 287 exp_continue 288 } 289 -re "$gdb_prompt $" { 290 pass $test 291 } 292 } 293 if ![regexp {^(NONE|FOUND-.*)$} $displacement] { 294 fail $test_displacement 295 } 296 297 gdb_test "bt" "#\[0-9\]+ +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#\[0-9\]+ +\[^\r\n\]*\\mmain\\M.*" "attach main bt" 298 gdb_exit 299 } 300} 301 302proc test_attach {file displacement {relink_args ""}} { 303 global board_info 304 global exec 305 306 gdb_exit 307 308 set test "sleep function started" 309 310 set command "${file} sleep" 311 set res [remote_spawn host $command] 312 if { $res < 0 || $res == "" } { 313 perror "Spawning $command failed." 314 fail $test 315 return 316 } 317 set pid [exp_pid -i $res] 318 gdb_expect { 319 -re "sleeping\r\n" { 320 pass $test 321 } 322 eof { 323 fail "$test (eof)" 324 return 325 } 326 timeout { 327 fail "$test (timeout)" 328 return 329 } 330 } 331 332 if {$relink_args == ""} { 333 test_attach_gdb $exec $pid $displacement "attach" 334 } else { 335 # These could be rather passed as arguments. 336 global interp_saved interp 337 338 foreach relink {YES NO} { 339 # Formerly this test was testing only prelinking of $EXEC. As the 340 # prelink command automatically prelinks all of $EXEC's libraries, 341 # even $INTERP got prelinked. Therefore, we formerly had to 342 # `[file_copy $interp_saved $interp]' to make $INTERP not affected 343 # by this prelinking of $EXEC. 344 # 345 # But now we need to test even prelinking of $INTERP. We could 346 # create a separate test to test just the $INTERP prelinking. For 347 # test simplicity, we merged this test and the test above by not 348 # restoring $INTERP after $EXEC prelink. $INTERP gets restored 349 # later below. 350 # 351 # `(wrong library or version mismatch?)' messages are printed for 352 # $binfile_lib on platforms converting REL->RELA relocations by 353 # prelink (such as on i386). There is no reliable way to verify 354 # the library file matches the running library in such case but 355 # GDB at least attempts to set the right displacement. We test 356 # `libfunc' is present in the backtrace and therefore the 357 # displacement has been guessed right. 358 359 if [prelink$relink $relink_args [file tail $exec]] { 360 # /proc/PID/exe cannot be loaded as it is "EXECNAME (deleted)". 361 test_attach_gdb $exec $pid $displacement "attach-relink$relink" 362 } 363 } 364 file_copy $interp_saved $interp 365 } 366 367 remote_exec host "kill -9 $pid" 368} 369 370proc test_ld {file ifmain trynosym displacement} { 371 global srcdir subdir gdb_prompt expect_out inferior_exited_re solib_bp 372 373 # First test normal `file'-command loaded $FILE with symbols. 374 375 gdb_exit 376 gdb_start 377 # Clear it to never find any separate debug infos in $debug_root. 378 gdb_test_no_output "set debug-file-directory" 379 gdb_reinitialize_dir $srcdir/$subdir 380 gdb_load $file 381 382 # Print the "PIE (Position Independent Executable) displacement" message. 383 gdb_test_no_output "set verbose on" 384 385 # We want to test the re-run of a PIE in the case where the executable 386 # is loaded with a different displacement, but disable-randomization 387 # prevents that from happening. So turn it off. 388 gdb_test "set disable-randomization off" 389 390 if $ifmain { 391 gdb_test_no_output "set args segv" 392 } else { 393 global binfile_test 394 395 # ld.so needs some executable to run to reach _dl_debug_state. 396 gdb_test_no_output "set args [standard_output_file $binfile_test]" \ 397 "set args OBJDIR/${subdir}/$binfile_test" 398 } 399 400 reach $solib_bp "run" $displacement 401 402 gdb_test "bt" "#0 +\[^\r\n\]*\\m(__GI_)?$solib_bp\\M.*" "dl bt" 403 404 if $ifmain { 405 reach "main" continue "NONE" 406 407 reach "libfunc" continue "NONE" 408 409 gdb_test "bt" "#0 +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#1 +\[^\r\n\]*\\mmain\\M.*" "main bt" 410 } 411 412 # Try re-run if the new PIE displacement takes effect. 413 gdb_test "kill" "" "kill" {Kill the program being debugged\? \(y or n\) } "y" 414 reach $solib_bp "run" $displacement 415 416 if $ifmain { 417 test_core $file $displacement 418 419 test_attach $file $displacement 420 } 421 422 if !$trynosym { 423 return 424 } 425 426 with_test_prefix "symbol-less" { 427 # Test also `exec-file'-command loaded $FILE - therefore 428 # without symbols. SYMBOL_OBJFILE is not available and only 429 # EXEC_BFD must be used. 430 431 gdb_exit 432 gdb_start 433 # Clear it to never find any separate debug infos in $debug_root. 434 gdb_test_no_output "set debug-file-directory" 435 gdb_reinitialize_dir $srcdir/$subdir 436 437 # Print the "PIE (Position Independent Executable) 438 # displacement" message. 439 gdb_test_no_output "set verbose on" 440 441 # Test no (error) message has been printed by `exec-file'. 442 set escapedfile [string_to_regexp $file] 443 gdb_test "exec-file $file" "exec-file $escapedfile" "load" 444 445 if $ifmain { 446 reach $solib_bp run $displacement 447 448 # Use two separate gdb_test_multiple statements to avoid timeouts due 449 # to slow processing of wildcard capturing long output 450 set test "info files" 451 set entrynohex "" 452 gdb_test_multiple $test $test { 453 -re "\r\n\[\t \]*Entry point:\[\t \]*0x(\[0-9a-f\]+)\r\n" { 454 set entrynohex $expect_out(1,string) 455 gdb_test_multiple "" $test { 456 -re "\r\n$gdb_prompt $" { 457 pass $test 458 } 459 } 460 } 461 } 462 463 # `info sym' cannot be tested for .opd as the binary may not have 464 # symbols. 465 if {[istarget powerpc64-*] && [is_lp64_target]} { 466 set test "convert entry point" 467 gdb_test_multiple "p *(void(*)(void) *) 0x$entrynohex" $test { 468 -re " =( \\(\[^0-9\]*\\))? 0x(\[0-9a-f\]+)( < \[^\r\n\]*)?\r\n$gdb_prompt $" { 469 set entrynohex $expect_out(2,string) 470 pass $test 471 } 472 } 473 } 474 if {$entrynohex != ""} { 475 gdb_test "break *0x$entrynohex" "" "break at entry point" 476 gdb_test "continue" "\r\nBreakpoint \[0-9\]+, 0x0*$entrynohex in .*" "entry point reached" 477 } 478 } else { 479 # There is no symbol to break at ld.so. Moreover it can 480 # exit with an error code. 481 482 set test "ld.so exit" 483 set test_displacement "seen displacement message as $displacement" 484 gdb_test_multiple "run" $test { 485 -re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " { 486 # Missing "$gdb_prompt $" is intentional. 487 if {$expect_out(1,string) == "0x0"} { 488 set case "ZERO" 489 } else { 490 set case "NONZERO" 491 } 492 if {$displacement == $case || $displacement == "PRESENT"} { 493 pass $test_displacement 494 set displacement "FOUND-$displacement" 495 } else { 496 fail $test_displacement 497 } 498 exp_continue 499 } 500 -re "$inferior_exited_re (normally|with code \[0-9\]+).\r\n$gdb_prompt $" { 501 # Do not check the binary filename as it may be truncated. 502 pass $test 503 } 504 } 505 if ![regexp {^(NONE|FOUND-.*)$} $displacement] { 506 fail $test_displacement 507 } 508 } 509 } 510} 511 512# Create separate binaries for each testcase - to make the possible reported 513# problem reproducible after the whole test run finishes. 514 515foreach ldprelink {NO YES} { 516 foreach ldsepdebug {NO IN SEP} { 517 # Skip running the ldsepdebug test if we do not have system separate 518 # debug info available. 519 if {$interp_system_debug == "" && $ldsepdebug == "SEP"} { 520 continue 521 } 522 523 set ldname "LDprelink${ldprelink}debug${ldsepdebug}" 524 set interp $binprefix-$ldname 525 526 # prelink needs to always prelink all the dependencies to do any file 527 # modifications of its files. ld.so also needs all the dependencies to 528 # be prelinked to omit the relocation process. In-memory file offsets 529 # are not dependent whether ld.so went the prelink way or through the 530 # relocation process. 531 # 532 # For GDB we are not interested whether prelink succeeds as it is 533 # transparent to GDB. GDB is being tested for differences of file 534 # offsets vs. in-memory offsets. So we have to prelink even ld.so for 535 # the BIN modification to happen but we need to restore the original 536 # possibly unprelinked ld.so to test all the combinations for GDB. 537 set interp_saved ${interp}-saved 538 539 with_test_prefix "$ldname" { 540 if {$ldsepdebug == "NO"} { 541 file_copy $interp_system $interp 542 # Never call strip-debug before unprelink: 543 # prelink: ...: Section .note.gnu.build-id created after prelinking 544 if ![prelinkNO $interp] { 545 continue 546 } 547 strip_debug $interp 548 } elseif {$ldsepdebug == "IN" && $interp_system_debug == ""} { 549 file_copy $interp_system $interp 550 } elseif {$ldsepdebug == "IN" && $interp_system_debug != ""} { 551 file_copy $interp_system $interp 552 file_copy $interp_system_debug "${interp}.debug" 553 # eu-unstrip: DWARF data in '...' not adjusted for prelinking bias; consider prelink -u 554 if {![prelinkNO $interp] || ![prelinkNO "${interp}.debug"]} { 555 continue 556 } 557 set test "eu-unstrip unprelinked:[file tail $interp_system] + [file tail $interp_system_debug] to [file tail $interp]" 558 set command "exec eu-unstrip -o $interp $interp ${interp}.debug" 559 verbose -log "command is $command" 560 if [catch $command] { 561 setup_xfail *-*-* 562 fail $test 563 continue 564 } else { 565 pass $test 566 } 567 } elseif {$ldsepdebug == "SEP" && $interp_system_debug == ""} { 568 file_copy $interp_system $interp 569 # eu-unstrip: DWARF data in '...' not adjusted for prelinking bias; consider prelink -u 570 if ![prelinkNO $interp] { 571 continue 572 } 573 gdb_gnu_strip_debug $interp 574 } elseif {$ldsepdebug == "SEP" && $interp_system_debug != ""} { 575 file_copy $interp_system $interp 576 file_copy $interp_system_debug "${interp}.debug" 577 } 578 579 if {$ldsepdebug == "SEP"} { 580 if ![prelinkNO "${interp}.debug"] { 581 continue 582 } 583 } else { 584 file delete "${interp}.debug" 585 } 586 587 if ![prelink$ldprelink $interp] { 588 continue 589 } 590 if {$ldprelink == "NO"} { 591 set displacement "NONZERO" 592 } else { 593 # x86* kernel loads prelinked PIE binary at its 594 # prelinked address but ppc* kernel loads it at a 595 # random address. prelink normally skips PIE binaries 596 # during the system scan. 597 set displacement "PRESENT" 598 } 599 test_ld $interp 0 [expr {$ldsepdebug == "NO"}] $displacement 600 601 if ![file_copy $interp $interp_saved] { 602 continue 603 } 604 605 foreach binprelink {NO YES} { 606 foreach binsepdebug {NO IN SEP} { 607 # "ATTACH" is like "YES" but it is modified during 608 # run. It cannot be used for problem 609 # reproducibility after the testcase ends. 610 foreach binpie {NO YES ATTACH} { 611 # This combination is not possible, non-PIE (fixed address) 612 # binary cannot be prelinked to any (other) address. 613 if {$binprelink == "YES" && $binpie == "NO"} { 614 continue 615 } 616 617 set binname "BINprelink${binprelink}debug${binsepdebug}pie${binpie}" 618 set exec $binprefix-$binname 619 620 with_test_prefix "$binname" { 621 set opts "ldflags=-Wl,$binfile_lib,-rpath,[file dirname $binfile_lib]" 622 if {$binsepdebug != "NO"} { 623 lappend opts {debug} 624 } 625 if {$binpie != "NO"} { 626 lappend opts {additional_flags=-fPIE -pie} 627 } 628 629 set dir ${exec}.d 630 set relink_args [build_executable_own_libs ${test}.exp [file tail $exec] $srcfile $opts $interp $dir] 631 if {$relink_args == ""} { 632 continue 633 } 634 635 if {$binsepdebug == "SEP"} { 636 gdb_gnu_strip_debug $exec 637 } 638 639 if {$binpie == "NO"} { 640 set displacement "NONE" 641 } elseif {$binprelink == "NO"} { 642 set displacement "NONZERO" 643 } else { 644 # x86* kernel loads prelinked PIE binary at its prelinked 645 # address but ppc* kernel loads it at a random address. 646 # prelink normally skips PIE binaries during the system scan. 647 set displacement "PRESENT" 648 } 649 650 if {[prelink$binprelink $relink_args [file tail $exec]] 651 && [file_copy $interp_saved $interp]} { 652 if {$binpie != "ATTACH"} { 653 test_ld $exec 1 [expr {$binsepdebug == "NO"}] $displacement 654 } else { 655 # If the file has been randomly prelinked it must be 656 # "NONZERO". We could see "ZERO" only if it was unprelinked 657 # and it is now running at the same address - which is 0 but 658 # executable can never run at address 0. 659 660 set displacement "NONZERO" 661 test_attach $exec $displacement $relink_args 662 663 # ATTACH means that executables and libraries have been 664 # modified after they have been run. They cannot be reused 665 # for problem reproducibility after the testcase ends in 666 # the ATTACH case. Therefore they are rather deleted not 667 # to confuse after the run finishes. 668 set exec_debug [system_debug_get $exec] 669 if {$exec_debug != ""} { 670 # `file delete [glob "${exec_debug}*"]' does not work. 671 foreach f [glob "${exec_debug}*"] { 672 file delete $f 673 } 674 } 675 file delete -force $dir 676 # `file delete [glob "${exec}*"]' does not work. 677 foreach f [glob "${exec}*"] { 678 file delete $f 679 } 680 } 681 } 682 } 683 } 684 } 685 } 686 687 file delete $interp_saved 688 } 689 } 690} 691