gdb/testsuite/lib/gdbserver-support.exp

   1 # Copyright 2000-2020 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 file is based on config/gdbserver.exp, which was written by
  17 # Michael Snyder (msnyder@redhat.com).
  18
  19 #
  20 # To be addressed or set in your baseboard config file:
  21 #
  22 #   set_board_info gdb_protocol "remote"
  23 #       Unles you have a gdbserver that uses a different protocol...
  24 #       After GDB starts you should check global $gdbserver_protocol instead as
  25 #       the testfile may force a specific different target protocol itself.
  26 #
  27 #   set_board_info gdb_server_prog
  28 #       This will be the path to the gdbserver program you want to test.
  29 #       Defaults to "gdbserver".
  30 #
  31 #   set_board_info sockethost
  32 #       The name of the host computer whose socket is being used.
  33 #       Defaults to "localhost".  Note: old gdbserver requires
  34 #       that you define this, but libremote/gdbserver does not.
  35 #
  36 #   set_board_info gdb,socketport
  37 #       Port id to use for socket connection.  If not set explicitly,
  38 #       it will start at "2345" and increment for each use.
  39 #       After GDB starts you should check global $gdbserver_gdbport for the
  40 #       real port used.  It is not useful if $gdbserver_reconnect_p was not set.
  41 #
  42
  43 #
  44 # gdb_target_cmd_ext
  45 # Send gdb the "target" command.  Returns 0 on success, 1 on failure, 2 on
  46 # unsupported.
  47 # If specified, then ADDITIONAL_TEXT must match the text that comes after
  48 # the connection message in order for the procedure to succeed.
  49 #
  50 proc gdb_target_cmd_ext { targetname serialport {additional_text ""} } {
  51     global gdb_prompt
  52
  53     set serialport_re [string_to_regexp $serialport]
  54     for {set i 1} {$i <= 3} {incr i} {
  55         send_gdb "target $targetname $serialport\n"
  56         gdb_expect 60 {
  57             -re "A program is being debugged already.*ill it.*y or n. $" {
  58                 send_gdb "y\n"
  59                 exp_continue
  60             }
  61             -re "unknown host.*$gdb_prompt" {
  62                 verbose "Couldn't look up $serialport"
  63             }
  64             -re "Couldn't establish connection to remote.*$gdb_prompt $" {
  65                 verbose "Connection failed"
  66             }
  67             -re "Non-stop mode requested, but remote does not support non-stop.*$gdb_prompt $" {
  68                 verbose "remote does not support non-stop"
  69                 return 1
  70             }
  71             -re "Remote MIPS debugging.*$additional_text.*$gdb_prompt" {
  72                 verbose "Set target to $targetname"
  73                 return 0
  74             }
  75             -re "Remote debugging using .*$serialport_re.*$additional_text.*$gdb_prompt $" {
  76                 verbose "Set target to $targetname"
  77                 return 0
  78             }
  79             -re "Remote debugging using stdio.*$additional_text.*$gdb_prompt $" {
  80                 verbose "Set target to $targetname"
  81                 return 0
  82             }
  83             -re "Remote target $targetname connected to.*$additional_text.*$gdb_prompt $" {
  84                 verbose "Set target to $targetname"
  85                 return 0
  86             }
  87             -re "Connected to.*$additional_text.*$gdb_prompt $" {
  88                 verbose "Set target to $targetname"
  89                 return 0
  90             }
  91             -re "Ending remote.*$gdb_prompt $" { }
  92             -re "Connection refused.*$gdb_prompt $" {
  93                 verbose "Connection refused by remote target.  Pausing, and trying again."
  94                 sleep 30
  95                 continue
  96             }
  97             -re "Timeout reading from remote system.*$gdb_prompt $" {
  98                 verbose "Got timeout error from gdb."
  99             }
 100             -notransfer -re "Remote debugging using .*\r\n> $" {
 101                 # We got an unexpected prompt while creating the target.
 102                 # Leave it there for the test to diagnose.
 103                 return 1
 104             }
 105             -re ": Network is unreachable.\r\n.*$gdb_prompt $" {
 106                 return 2
 107             }
 108             timeout {
 109                 send_gdb "\ 3"
 110                 break
 111             }
 112         }
 113     }
 114     return 1
 115 }
 116
 117 # Like gdb_target_cmd_ext, but returns 0 on success, 1 on failure.
 118
 119 proc gdb_target_cmd { args } {
 120     set res [eval gdb_target_cmd_ext $args]
 121     return [expr $res == 0 ? 0 : 1]
 122 }
 123
 124 global portnum
 125 set portnum "2345"
 126
 127 # Locate the gdbserver binary.  Returns "" if gdbserver could not be found.
 128
 129 proc find_gdbserver { } {
 130   global GDB
 131   global GDBSERVER
 132
 133   if [info exists GDBSERVER] {
 134     return ${GDBSERVER}
 135   }
 136
 137   if [target_info exists gdb_server_prog] {
 138     return [target_info gdb_server_prog]
 139   }
 140
 141   set toplevel [file join [file dirname $GDB] .. gdbserver]
 142   foreach gdbserver [list "${GDB}server" $toplevel] {
 143       if { [file isdirectory $gdbserver] } {
 144           append gdbserver "/gdbserver"
 145       }
 146
 147       if { [file executable $gdbserver] } {
 148           return $gdbserver
 149       }
 150   }
 151
 152   return ""
 153 }
 154
 155 # Return non-zero if we should skip gdbserver-specific tests.
 156
 157 proc skip_gdbserver_tests { } {
 158   if { [find_gdbserver] == "" } {
 159     return 1
 160   }
 161
 162     # If GDB is lack of XML support, and targets, like arm, have
 163     # multiple target descriptions, GDB doesn't know which target
 164     # description GDBserver uses, and may fail to parse 'g' packet
 165     # after connection.
 166     if { [gdb_skip_xml_test]
 167          && ([istarget "arm*-*-linux*"]
 168              || [istarget "mips*-*-linux*"]
 169              || [istarget "powerpc*-*-linux*"]
 170              || [istarget "s390*-*-linux*"]
 171              || [istarget "x86_64-*-linux*"]
 172              || [istarget "i\[34567\]86-*-linux*"]) } {
 173         return 1
 174     }
 175
 176   return 0
 177 }
 178
 179 # Download the currently loaded program to the target if necessary.
 180 # Return the target system filename.
 181 # NOTE: This was named "gdbserver_download", but that collides with the
 182 # dejagnu "download" API function when using load_generic_config "gdbserver".
 183
 184 proc gdbserver_download_current_prog { } {
 185     global gdbserver_host_exec
 186     global gdbserver_host_mtime
 187     global gdbserver_server_exec
 188     global last_loaded_file
 189
 190     if { ![info exists last_loaded_file] } {
 191         return ""
 192     }
 193
 194     set host_exec $last_loaded_file
 195
 196     # If we already downloaded a file to the target, see if we can reuse it.
 197     set reuse 0
 198     if { [info exists gdbserver_server_exec] } {
 199         set reuse 1
 200
 201         # If the file has changed, we can not.
 202         if { $host_exec != $gdbserver_host_exec } {
 203             set reuse 0
 204         }
 205
 206         # If the mtime has changed, we can not.
 207         if { [file mtime $host_exec] != $gdbserver_host_mtime } {
 208             set reuse 0
 209         }
 210     }
 211
 212     if { $reuse == 0 } {
 213         set gdbserver_host_exec $host_exec
 214         set gdbserver_host_mtime [file mtime $host_exec]
 215         set gdbserver_server_exec [gdb_remote_download target $host_exec]
 216     }
 217
 218     return $gdbserver_server_exec
 219 }
 220
 221 # Default routine to compute the argument to "target remote".
 222
 223 proc gdbserver_default_get_remote_address { host port } {
 224     # Historically HOST included the trailing ":".
 225     # To avoid breaking any board files out there we leave things alone.
 226     return "$host$port"
 227 }
 228
 229 # Default routine to compute the "comm" argument for gdbserver.
 230
 231 proc gdbserver_default_get_comm_port { port } {
 232     return "$port"
 233 }
 234
 235 # Start a gdbserver process with initial OPTIONS and trailing ARGUMENTS.
 236 # The port will be filled in between them automatically.
 237 #
 238 # Returns the target protocol and socket to connect to.
 239
 240 proc gdbserver_start { options arguments } {
 241     global portnum
 242     global GDB_TEST_SOCKETHOST
 243
 244     # Port id -- either specified in baseboard file, or managed here.
 245     if [target_info exists gdb,socketport] {
 246         set portnum [target_info gdb,socketport]
 247     } else {
 248         # Bump the port number to avoid conflicts with hung ports.
 249         incr portnum
 250     }
 251
 252     # Extract the local and remote host ids from the target board struct.
 253     if { [info exists GDB_TEST_SOCKETHOST] } {
 254         # The user is not supposed to provide a port number, just a
 255         # hostname/address, therefore we add the trailing ":" here.
 256         set debughost "${GDB_TEST_SOCKETHOST}:"
 257         # Escape open and close square brackets.
 258         set debughost_tmp [string map { [ \\[ ] \\] } $debughost]
 259         # We need a "gdbserver" version of the debughost, which will
 260         # have the possible connection prefix stripped.  This is
 261         # because gdbserver currently doesn't recognize the prefixes.
 262         regsub -all "^\(tcp:|udp:|tcp4:|udp4:|tcp6:|udp6:\)" $debughost_tmp "" debughost_gdbserver
 263     } elseif [target_info exists sockethost] {
 264         set debughost [target_info sockethost]
 265         set debughost_gdbserver $debughost
 266     } else {
 267         set debughost "localhost:"
 268         set debughost_gdbserver $debughost
 269     }
 270
 271     # Some boards use a different value for the port that is passed to
 272     # gdbserver and the port that is passed to the "target remote" command.
 273     # One example is the stdio gdbserver support.
 274     if [target_info exists gdb,get_remote_address] {
 275         set get_remote_address [target_info gdb,get_remote_address]
 276     } else {
 277         set get_remote_address gdbserver_default_get_remote_address
 278     }
 279     if [target_info exists gdbserver,get_comm_port] {
 280         set get_comm_port [target_info gdbserver,get_comm_port]
 281     } else {
 282         set get_comm_port gdbserver_default_get_comm_port
 283     }
 284
 285     # Extract the protocol
 286     if [target_info exists gdb_protocol] {
 287         set protocol [target_info gdb_protocol]
 288     } else {
 289         set protocol "remote"
 290     }
 291
 292     set gdbserver [find_gdbserver]
 293
 294     # Loop till we find a free port.
 295     while 1 {
 296         # Fire off the debug agent.
 297         set gdbserver_command "$gdbserver"
 298
 299         # If gdbserver_reconnect will be called $gdbserver_reconnect_p must be
 300         # set to true already during gdbserver_start.
 301         global gdbserver_reconnect_p
 302         global srcdir
 303         global subdir
 304         if {![info exists gdbserver_reconnect_p] || !$gdbserver_reconnect_p} {
 305             # GDB client could accidentally connect to a stale server.
 306             append gdbserver_command " --once"
 307         }
 308
 309         # Enable debug if set.
 310         if [gdbserver_debug_enabled] {
 311             global gdbserverdebug
 312             set enabled 0
 313             foreach entry [split $gdbserverdebug ,] {
 314               switch -- $entry {
 315                 "debug" {
 316                   append gdbserver_command " --debug"
 317                   set enabled 1
 318                 }
 319                 "remote" {
 320                   append gdbserver_command " --remote-debug"
 321                   set enabled 1
 322                 }
 323               }
 324             }
 325             # Ensure debugfile is only added if something has been enabled
 326             if { $enabled } {
 327               set debugfile [standard_output_file gdbserver.debug]
 328               append gdbserver_command " --debug-file=$debugfile"
 329             }
 330         }
 331
 332         if { $options != "" } {
 333             append gdbserver_command " $options"
 334         }
 335         if { $debughost_gdbserver != "" } {
 336             append gdbserver_command " $debughost_gdbserver"
 337         }
 338         if { $portnum != "" } {
 339             if { $debughost_gdbserver == "" } {
 340                 append gdbserver_command " "
 341             }
 342             append gdbserver_command "[$get_comm_port $portnum]"
 343         }
 344         if { $arguments != "" } {
 345             append gdbserver_command " $arguments"
 346         }
 347
 348         gdbserver_write_cmd_file $gdbserver_command
 349
 350         global server_spawn_id
 351         set server_spawn_id [remote_spawn target $gdbserver_command]
 352
 353         # GDBserver doesn't do inferior I/O through GDB.  But we can
 354         # talk to the program using GDBserver's tty instead.
 355         global inferior_spawn_id
 356         set inferior_spawn_id $server_spawn_id
 357
 358         # Wait for the server to open its TCP socket, so that GDB can connect.
 359         expect {
 360             -i $server_spawn_id
 361             -timeout 120
 362             -notransfer
 363             -re "Listening on" { }
 364             -re "Can't (bind address|listen on socket): Address already in use\\.\r\n" {
 365                 verbose -log "Port $portnum is already in use."
 366                 if ![target_info exists gdb,socketport] {
 367                     # Bump the port number to avoid the conflict.
 368                     wait -i $expect_out(spawn_id)
 369                     incr portnum
 370                     continue
 371                 }
 372             }
 373             -re ".*: cannot resolve name: .*\r\n" {
 374                 error "gdbserver cannot resolve name."
 375             }
 376             timeout {
 377                 error "Timeout waiting for gdbserver response."
 378             }
 379         }
 380         break
 381     }
 382
 383     return [list $protocol [$get_remote_address $debughost $portnum]]
 384 }
 385
 386 # Start a gdbserver process running SERVER_EXEC, and connect GDB
 387 # to it.  CHILD_ARGS are passed to the inferior.
 388 #
 389 # Returns the target protocol and socket to connect to.
 390
 391 proc gdbserver_spawn { child_args } {
 392     set target_exec [gdbserver_download_current_prog]
 393
 394     # Fire off the debug agent.  This flavour of gdbserver takes as
 395     # arguments the port information, the name of the executable file to
 396     # be debugged, and any arguments.
 397     set arguments "$target_exec"
 398     if { $child_args != "" } {
 399         append arguments " $child_args"
 400     }
 401     return [gdbserver_start "" $arguments]
 402 }
 403
 404 # Close the GDBserver connection.
 405
 406 proc close_gdbserver {} {
 407     global server_spawn_id
 408
 409     # We can't just call close, because if gdbserver is local then that means
 410     # that it will get a SIGHUP.  Doing it this way could also allow us to
 411     # get at the inferior's input or output if necessary, and means that we
 412     # don't need to redirect output.
 413
 414     if {![info exists server_spawn_id]} {
 415         return
 416     }
 417
 418     verbose "Quitting GDBserver"
 419
 420     catch "close -i $server_spawn_id"
 421     catch "wait -i $server_spawn_id"
 422     unset server_spawn_id
 423 }
 424
 425 # Hook into GDB exit, and close GDBserver.  We must load this
 426 # explicitly here, and rename the procedures we want to override.
 427 load_lib mi-support.exp
 428
 429 if { [info procs gdbserver_orig_gdb_exit] == "" } {
 430     rename gdb_exit gdbserver_orig_gdb_exit
 431     rename mi_gdb_exit gdbserver_orig_mi_gdb_exit
 432 }
 433
 434 # Cleanup gdbserver $server_spawn_id
 435
 436 proc gdbserver_exit { is_mi } {
 437     global gdb_spawn_id server_spawn_id
 438     global gdb_prompt
 439
 440     if {[info exists gdb_spawn_id] && [info exists server_spawn_id]} {
 441         # GDB may be terminated in an expected way or an unexpected way,
 442         # but DejaGNU doesn't know that, so gdb_spawn_id isn't unset.
 443         # Catch the exceptions.
 444         catch {
 445             if { $is_mi } {
 446                 set monitor_exit "-interpreter-exec console \"monitor exit\""
 447             } else {
 448                 set monitor_exit "monitor exit"
 449             }
 450             send_gdb "$monitor_exit\n";
 451             # We use expect rather than gdb_expect because
 452             # we want to suppress printing exception messages, otherwise,
 453             # remote_expect, invoked by gdb_expect, prints the exceptions.
 454             expect {
 455                 -i "$gdb_spawn_id" -re "$gdb_prompt $" {
 456                     exp_continue
 457                 }
 458                 -i "$server_spawn_id" eof {
 459                     wait -i $expect_out(spawn_id)
 460                     unset server_spawn_id
 461                 }
 462                timeout {
 463                    warning "Timed out waiting for EOF in server after $monitor_exit"
 464                }
 465             }
 466         }
 467     }
 468     close_gdbserver
 469 }
 470
 471 # Local version of gdb_exit that also cleans up gdbserver $server_spawn_id.
 472
 473 proc gdbserver_gdb_exit { is_mi } {
 474     global gdb_spawn_id server_spawn_id
 475     global gdb_prompt
 476     global gdbserver_reconnect_p
 477
 478     # Leave GDBserver running if we're exiting GDB in order to
 479     # reconnect to the same instance of GDBserver again.
 480     if {[info exists gdbserver_reconnect_p] && $gdbserver_reconnect_p} {
 481         if { $is_mi } {
 482             gdbserver_orig_mi_gdb_exit
 483         } else {
 484             gdbserver_orig_gdb_exit
 485         }
 486         return
 487     }
 488
 489     gdbserver_exit $is_mi
 490
 491     if { $is_mi } {
 492         gdbserver_orig_mi_gdb_exit
 493     } else {
 494         gdbserver_orig_gdb_exit
 495     }
 496 }
 497
 498 proc gdb_exit {} {
 499     gdbserver_gdb_exit 0
 500 }
 501
 502 proc mi_gdb_exit {} {
 503     gdbserver_gdb_exit 1
 504 }
 505
 506 # Start a gdbserver process running HOST_EXEC and pass CHILD_ARGS
 507 # to it.  Return 0 on success, or non-zero on failure: 2 if gdbserver
 508 # failed to start or 1 if we couldn't connect to it.
 509
 510 proc gdbserver_run { child_args } {
 511     global gdbserver_protocol
 512     global gdbserver_gdbport
 513
 514     # Kill anything running before we try to start gdbserver, in case
 515     # we are sharing a serial connection.
 516     global gdb_prompt
 517     send_gdb "kill\n" optional
 518     gdb_expect 120 {
 519         -re "Kill the program being debugged. .y or n. $" {
 520             send_gdb "y\n"
 521             verbose "\t\tKilling previous program being debugged"
 522             exp_continue
 523         }
 524         -re "$gdb_prompt $" {
 525             # OK.
 526         }
 527     }
 528
 529     if { [catch { gdbserver_spawn $child_args } res] == 1 } {
 530         perror $res
 531         return 2
 532     }
 533     set gdbserver_protocol [lindex $res 0]
 534     set gdbserver_gdbport [lindex $res 1]
 535
 536     return [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 537 }
 538
 539 # Reconnect to the previous gdbserver session.
 540
 541 proc gdbserver_reconnect { } {
 542     global gdbserver_protocol
 543     global gdbserver_gdbport
 544
 545     global gdbserver_reconnect_p
 546     if {![info exists gdbserver_reconnect_p] || !$gdbserver_reconnect_p} {
 547         error "gdbserver_reconnect_p is not set before gdbserver_reconnect"
 548         return 0
 549     }
 550
 551     return [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 552 }
 553
 554 # Start gdbserver in extended mode with OPTIONS and connect to it.  Note
 555 # this frobs $gdbserver_protocol, so should be used only from a board
 556 # that usually connects in target remote mode.
 557 proc gdbserver_start_extended { {options ""} } {
 558     global gdbserver_protocol
 559     global gdbserver_gdbport
 560     global use_gdb_stub
 561
 562     set gdbserver_options "--multi"
 563
 564     if { $options != "" } {
 565         append gdbserver_options " $options"
 566     }
 567
 568     if { [catch { gdbserver_start $gdbserver_options "" } res] == 1 } {
 569         perror $res
 570         return 2
 571     }
 572     set gdbserver_protocol [lindex $res 0]
 573     if { [string first "extended-" $gdbserver_protocol] != 0} {
 574         set gdbserver_protocol "extended-$gdbserver_protocol"
 575     }
 576     set gdbserver_gdbport [lindex $res 1]
 577
 578     # Even if the board file is testing with target remote, our caller
 579     # wants to test against gdbserver in extended-remote mode.  Make sure to
 580     # disable stub-like techniques.
 581     set use_gdb_stub 0
 582
 583     return [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 584 }
 585
 586 # Start and connect to a gdbserver in extended/multi mode.  Unlike
 587 # gdbserver_start_extended, this does not frob $gdbserver_protocol.
 588
 589 proc gdbserver_start_multi { } {
 590     global gdbserver_protocol
 591     global gdbserver_gdbport
 592
 593     if { [catch { gdbserver_start "--multi" "" } res] == 1 } {
 594         perror $res
 595         return 2
 596     }
 597     set gdbserver_protocol [lindex $res 0]
 598     set gdbserver_gdbport [lindex $res 1]
 599
 600     return [gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 601 }
 602
 603 # Start a gdbserver process in multi/extended mode, and have GDB
 604 # connect to it (MI version).  Return 0 on success, or non-zero on
 605 # failure.
 606
 607 proc mi_gdbserver_start_multi { } {
 608     global gdbserver_protocol
 609     global gdbserver_gdbport
 610
 611     if { [catch { gdbserver_start "--multi" "" } res] == 1 } {
 612         perror $res
 613         return 2
 614     }
 615     set gdbserver_protocol [lindex $res 0]
 616     set gdbserver_gdbport [lindex $res 1]
 617
 618     return [mi_gdb_target_cmd $gdbserver_protocol $gdbserver_gdbport]
 619 }
 620
 621 # Check if debugging is enabled for gdbserver.
 622
 623 proc gdbserver_debug_enabled { } {
 624     global gdbserverdebug
 625
 626     # If not already read, get the debug setting from environment or board setting.
 627     if ![info exists gdbserverdebug] {
 628         global env
 629         if [info exists env(GDBSERVER_DEBUG)] {
 630             set gdbserverdebug $env(GDBSERVER_DEBUG)
 631         } elseif [target_info exists gdbserver,debug] {
 632             set gdbserverdebug [target_info gdbserver,debug]
 633         } else {
 634             return 0
 635         }
 636     }
 637
 638     # Expand the all option
 639     if { $gdbserverdebug == "all" } {
 640       set gdbserverdebug "debug,remote,replay"
 641     }
 642
 643     # Ensure it is not empty.
 644     return [expr { $gdbserverdebug != "" }]
 645 }
 646
 647 # Write the command line used to invocate gdbserver to the cmd file.
 648
 649 proc gdbserver_write_cmd_file { cmdline } {
 650     set logfile [standard_output_file_with_gdb_instance gdbserver.cmd]
 651     set cmd_file [open $logfile w]
 652     puts $cmd_file $cmdline
 653     catch "close $cmd_file"
 654 }
 655
 656 # Override gdb_debug_init so that we can set replay logging in GDB if required.
 657 # Backup the original function so we can call it afterwards
 658
 659 rename gdb_debug_init _gdb_debug_init
 660
 661 proc gdb_debug_init { } {
 662     global gdbserverdebug
 663     global gdb_prompt
 664
 665     if [gdbserver_debug_enabled] {
 666       foreach entry [split $gdbserverdebug ,] {
 667         if { $entry == "replay" } {
 668           set replayfile [standard_output_file_with_gdb_instance gdbserver.replay]
 669           send_gdb "set remotelogfile $replayfile\n" optional
 670           gdb_expect 10 {
 671             -re "$gdb_prompt $" {}
 672           }
 673         }
 674       }
 675     }
 676
 677     # Now call the standard debug init function
 678     _gdb_debug_init
 679 }