gdb/testsuite/gdb.base/sigstep.exp

   1 # Copyright 2004, 2005, 2006, 2007, 2008 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
  17 # The program sigstep.c creates a very simple backtrace containing one
  18 # signal handler and signal trampoline.  A flag is set and then the
  19 # handler returns.  This is repeated at infinitum.
  20
  21 # This test runs the program up to the signal handler, and then
  22 # attempts to step/next out of the handler and back into main.
  23
  24 if [target_info exists gdb,nosignals] {
  25     verbose "Skipping sigstep.exp because of nosignals."
  26     continue
  27 }
  28
  29 if $tracelevel then {
  30     strace $tracelevel
  31 }
  32
  33 set prms_id 0
  34 set bug_id 0
  35
  36 set testfile sigstep
  37 set srcfile ${testfile}.c
  38 set binfile ${objdir}/${subdir}/${testfile}
  39 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  40     untested "Couldn't compile ${srcfile}.c"
  41     return -1
  42 }
  43
  44 # get things started
  45 gdb_exit
  46 gdb_start
  47 gdb_reinitialize_dir $srcdir/$subdir
  48 gdb_load ${binfile}
  49
  50 gdb_test "display/i \$pc"
  51
  52 # Advance to main
  53 if { ![runto_main] } then {
  54     gdb_suppress_tests;
  55 }
  56
  57 # Pass all the alarms straight through (but verbosely)
  58 # gdb_test "handle SIGALRM print pass nostop"
  59 # gdb_test "handle SIGVTALRM print pass nostop"
  60 # gdb_test "handle SIGPROF print pass nostop"
  61
  62 # Run to the signal handler, validate the backtrace.
  63 gdb_test "break handler"
  64 gdb_test "continue" ".* handler .*" "continue to stepi handler"
  65 send_gdb "bt\n"
  66 gdb_expect_list "backtrace for nexti" ".*$gdb_prompt $" {
  67     "\[\r\n\]+.0 \[^\r\n\]* handler "
  68     "\[\r\n\]+.1  .signal handler called."
  69     "\[\r\n\]+.2 \[^\r\n\]* main .*"
  70 }
  71
  72 proc advance { i } {
  73     global gdb_prompt
  74     set prefix "$i from handler"
  75
  76     # Get us back into the handler
  77     gdb_test "continue" ".* handler .*" "$prefix; continue to handler"
  78
  79     set test "$prefix; leave handler"
  80     gdb_test_multiple "$i" "${test}" {
  81         -re "Could not insert single-step breakpoint.*$gdb_prompt $" {
  82             setup_kfail "sparc*-*-openbsd*" gdb/1736
  83             fail "$test (could not insert single-step breakpoint)"
  84         }
  85         -re "done = 1;.*${gdb_prompt} $" {
  86             send_gdb "$i\n"
  87             exp_continue -continue_timer
  88         }
  89         -re "\} .. handler .*${gdb_prompt} $" {
  90             send_gdb "$i\n"
  91             exp_continue -continue_timer
  92         }
  93         -re "Program exited normally.*${gdb_prompt} $" {
  94             setup_kfail powerpc-*-*bsd* gdb/1639
  95             fail "$test (program exited)"
  96         }
  97         -re "(while ..done|done = 0).*${gdb_prompt} $" {
  98             # After stepping out of a function /r signal-handler, GDB will
  99             # advance the inferior until it is at the first instruction of
 100             # a code-line.  While typically things return to the middle of
 101             # the "while..." (and hence GDB advances the inferior to the
 102             # "return..." line) it is also possible for the return to land
 103             # on the first instruction of "while...".  Accept both cases.
 104             pass "$test"
 105         }
 106     }
 107 }
 108
 109 proc advancei { i } {
 110     global gdb_prompt
 111     set prefix "$i from handleri"
 112     set program_exited 0
 113
 114     # Get us back into the handler
 115     gdb_test "continue" ".* handler .*" "$prefix; continue to handler"
 116
 117     set test "$prefix; leave handler"
 118     gdb_test_multiple "$i" "${test}" {
 119         -re "Cannot insert breakpoint 0.*${gdb_prompt} $" {
 120             # Some platforms use a special read-only page for signal
 121             # trampolines.  We can't set a breakpoint there, and we
 122             # don't gracefully fall back to single-stepping.
 123             setup_kfail "i?86-*-linux*" gdb/1736
 124             setup_kfail "*-*-openbsd*" gdb/1736
 125             fail "$test (could not set breakpoint)"
 126             return
 127         }
 128         -re "Could not insert single-step breakpoint.*$gdb_prompt $" {
 129             setup_kfail "sparc*-*-openbsd*" gdb/1736
 130             fail "$test (could not insert single-step breakpoint)"
 131         }
 132         -re "Breakpoint \[0-9\]*, handler .*${gdb_prompt} $" {
 133             fail "$test (hit breakpoint again)"
 134         }
 135         -re "done = 1;.*${gdb_prompt} $" {
 136             send_gdb "$i\n"
 137             exp_continue -continue_timer
 138         }
 139         -re "\} .. handler .*${gdb_prompt} $" {
 140             send_gdb "$i\n"
 141             exp_continue -continue_timer
 142         }
 143         -re "signal handler called.*${gdb_prompt} $" {
 144             pass "$test"
 145         }
 146         -re "main .*${gdb_prompt} $" {
 147             fail "$test (in main)"
 148         }
 149         -re "Program exited normally.*${gdb_prompt} $" {
 150             fail "$test (program exited)"
 151             set program_exited 1
 152         }
 153         -re "Make handler return now.*y or n. $" {
 154             send_gdb "y\n"
 155             exp_continue -continue_timer
 156         }
 157     }
 158
 159     set test "$prefix; leave signal trampoline"
 160     gdb_test_multiple "$i" "${test}" {
 161         -re "while .*${gdb_prompt} $" {
 162             pass "$test (in main)"
 163         }
 164         -re "signal handler called.*${gdb_prompt} $" {
 165             send_gdb "$i\n"
 166             exp_continue -continue_timer
 167         }
 168         -re "return .*${gdb_prompt} $" {
 169             fail "$test (stepped)"
 170         }
 171         -re "Make .*frame return now.*y or n. $" {
 172             send_gdb "y\n"
 173             exp_continue -continue_timer
 174         }
 175         -re "Program exited normally.*${gdb_prompt} $" {
 176             kfail gdb/1639 "$test (program exited)"
 177             set program_exited 1
 178         }
 179         -re "The program is not being run.*${gdb_prompt} $" {
 180             if { $program_exited } {
 181                 # Previously kfailed with an exit
 182                 pass "$test (the program is not being run)"
 183             } else {
 184                 fail "$test (the program is not being run)"
 185             }
 186         }
 187     }
 188 }
 189
 190 # Check that we can step/next our way out of a signal handler.
 191
 192 advance step
 193 advancei stepi
 194
 195 advance next
 196 advancei nexti
 197
 198 advancei finish
 199 advancei return
 200 gdb_test "set done = 1" "" "Set done as return will have skipped it"
 201
 202
 203 # Check that we can step/next our way into / over a signal handler.
 204
 205 # There are at least the following cases: breakpoint @pc VS breakpoint
 206 # in handler VS step / next / continue.
 207
 208 # Use the real-time itimer, as otherwize the process never gets enough
 209 # time to expire the timer.
 210
 211 delete_breakpoints
 212 set infinite_loop [gdb_get_line_number {while (!done)}]
 213 gdb_test "set itimer = itimer_real"
 214 gdb_test "break [gdb_get_line_number {done = 0}]"
 215
 216 # Try stepping when there's a signal pending, and a breakpoint at the
 217 # handler.  Should step into the signal handler.
 218
 219 proc skip_to_handler { i } {
 220     global gdb_prompt
 221     global infinite_loop
 222     set prefix "$i to handler"
 223
 224     # Run around to the done
 225     # You can add more patterns to this if you need them.
 226     set test "$prefix; resync"
 227     gdb_test_multiple "continue" "$test" {
 228         -re "done = 0.*$gdb_prompt " {
 229             pass "$test"
 230         }
 231     }
 232
 233     # Advance to the infinite loop
 234     gdb_test "advance $infinite_loop" "" "$prefix; advance to infinite loop"
 235
 236     # Make the signal pending
 237     sleep 1
 238
 239     # Insert / remove the handler breakpoint.
 240     gdb_test "break handler" "" "$prefix; break handler"
 241     gdb_test "$i" " handler .*" "$prefix; performing $i"
 242     gdb_test "clear handler" "" "$prefix; clear handler"
 243 }
 244
 245 skip_to_handler step
 246 skip_to_handler next
 247 skip_to_handler continue
 248
 249 # Try stepping when there's a signal pending, and a breakpoint at the
 250 # handler's entry-point.  Should step into the signal handler stopping
 251 # at the entry-point.
 252
 253 # Some systems (e.x., GNU/Linux as of 2004-08-30), when delivering a
 254 # signal, resume the process at the first instruction of the signal
 255 # handler and not the first instruction of the signal trampoline.  The
 256 # stack is constructed such that the signal handler still appears to
 257 # have been called by the trampoline code.  This test checks that it
 258 # is possible to stop the inferior, even at that first instruction.
 259
 260 proc skip_to_handler_entry { i } {
 261     global gdb_prompt
 262     global infinite_loop
 263     set prefix "$i to handler entry"
 264
 265     # Run around to the done
 266     # You can add more patterns to this if you need them.
 267     set test "$prefix; resync"
 268     gdb_test_multiple "continue" "$test" {
 269         -re "done = 0.*$gdb_prompt " {
 270             pass "$test"
 271         }
 272     }
 273
 274     # Advance to the infinite loop
 275     gdb_test "advance $infinite_loop" "" "$prefix; advance to infinite loop"
 276
 277     # Make the signal pending
 278     sleep 1
 279
 280     # Insert / remove the handler breakpoint.
 281     gdb_test "break *handler" "" "$prefix; break handler"
 282     gdb_test "$i" " handler .*" "$prefix; performing $i"
 283     gdb_test "clear *handler" "" "$prefix; clear handler"
 284 }
 285
 286 skip_to_handler_entry step
 287 skip_to_handler_entry next
 288 skip_to_handler_entry continue
 289
 290 # Try stepping when there's a signal pending but no breakpoints.
 291 # Should skip the handler advancing to the next line.
 292
 293 proc skip_over_handler { i } {
 294     global gdb_prompt
 295     global infinite_loop
 296     set prefix "$i over handler"
 297
 298     # Run around to the done
 299     # You can add more patterns to this if you need them.
 300     set test "$prefix; resync"
 301     gdb_test_multiple "continue" "$test" {
 302         -re "done = 0.*$gdb_prompt " {
 303             pass "$test"
 304         }
 305     }
 306
 307     # Advance to the infinite loop
 308     gdb_test "advance $infinite_loop" "" "$prefix; advance to infinite loop"
 309
 310     # Make the signal pending
 311     sleep 1
 312
 313     gdb_test "$i" "done = 0.*" "$prefix; performing $i"
 314 }
 315
 316 skip_over_handler step
 317 skip_over_handler next
 318 skip_over_handler continue
 319
 320 # Try stepping when there's a signal pending, a pre-existing
 321 # breakpoint at the current instruction, and a breakpoint in the
 322 # handler.  Should advance to the signal handler.
 323
 324 proc breakpoint_to_handler { i } {
 325     global gdb_prompt
 326     global infinite_loop
 327     set prefix "$i on breakpoint, to handler"
 328
 329     # Run around to the done
 330     # You can add more patterns to this if you need them.
 331     set test "$prefix; resync"
 332     gdb_test_multiple "continue" "$test" {
 333         -re "done = 0.*$gdb_prompt " {
 334             pass "$test"
 335         }
 336     }
 337
 338     gdb_test "break $infinite_loop" "" "$prefix; break infinite loop"
 339     gdb_test "break handler" "" "$prefix; break handler"
 340
 341     # Continue to the infinite loop
 342     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"
 343
 344     # Make the signal pending
 345     sleep 1
 346
 347     setup_kfail "i*86-*-*" gdb/1738
 348     gdb_test "$i" " handler .*" "$prefix; performing $i"
 349     gdb_test "clear $infinite_loop" "" "$prefix; clear infinite loop"
 350     gdb_test "clear handler" "" "$prefix; clear handler"
 351 }
 352
 353 breakpoint_to_handler step
 354 breakpoint_to_handler next
 355 breakpoint_to_handler continue
 356
 357 # Try stepping when there's a signal pending, and a breakpoint at the
 358 # handler's entry instruction and a breakpoint at the current
 359 # instruction.  Should step into the signal handler and breakpoint at
 360 # that entry instruction.
 361
 362 # Some systems (e.x., GNU/Linux as of 2004-08-30), when delivering a
 363 # signal, resume the process at the first instruction of the signal
 364 # handler and not the first instruction of the signal trampoline.  The
 365 # stack is constructed such that the signal handler still appears to
 366 # have been called by the trampoline code.  This test checks that it
 367 # is possible to stop the inferior, even at that first instruction.
 368
 369 proc breakpoint_to_handler_entry { i } {
 370     global gdb_prompt
 371     global infinite_loop
 372     set prefix "$i on breakpoint, to handler entry"
 373
 374     # Run around to the done
 375     # You can add more patterns to this if you need them.
 376     set test "$prefix; resync"
 377     gdb_test_multiple "continue" "$test" {
 378         -re "done = 0.*$gdb_prompt " {
 379             pass "$test"
 380         }
 381     }
 382
 383     gdb_test "break $infinite_loop" "" "$prefix; break infinite loop"
 384     gdb_test "break *handler" "" "$prefix; break handler"
 385
 386     # Continue to the infinite loop
 387     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"
 388
 389     # Make the signal pending
 390     sleep 1
 391
 392     setup_kfail "i*86-*-*" gdb/1738
 393     gdb_test "$i" " handler .*" "$prefix; performing $i"
 394     gdb_test "clear $infinite_loop" "" "$prefix; clear infinite loop"
 395     gdb_test "clear *handler" "" "$prefix; clear handler"
 396 }
 397
 398 breakpoint_to_handler_entry step
 399 breakpoint_to_handler_entry next
 400 breakpoint_to_handler_entry continue
 401
 402 # Try stepping when there's a signal pending, and a pre-existing
 403 # breakpoint at the current instruction, and no breakpoint in the
 404 # handler.  Should advance to the next line.
 405
 406 proc breakpoint_over_handler { i } {
 407     global gdb_prompt
 408     global infinite_loop
 409     set prefix "$i on breakpoint, skip handler"
 410
 411     # Run around to the done
 412     # You can add more patterns to this if you need them.
 413     set test "$prefix; resync"
 414     gdb_test_multiple "continue" "$test" {
 415         -re "done = 0.*$gdb_prompt " {
 416             pass "$test"
 417         }
 418     }
 419
 420     gdb_test "break $infinite_loop" "" "$prefix; break infinite loop"
 421
 422     # Continue to the infinite loop
 423     gdb_test "continue" "while ..done.*" "$prefix; continue to infinite loop"
 424
 425     # Make the signal pending
 426     sleep 1
 427
 428     gdb_test "$i" "done = 0.*" "$prefix; performing $i"
 429     gdb_test "clear $infinite_loop" "" "$prefix; clear infinite loop"
 430 }
 431
 432 breakpoint_over_handler step
 433 breakpoint_over_handler next
 434 breakpoint_over_handler continue