gdb/testsuite/gdb.reverse/finish-reverse-bkpt.exp

   1 # Copyright 2008-2024 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 part of the GDB testsuite.
  17 #
  18 # 'reverse-finish' used to have a bug where user breakpoints set at
  19 # the functions entry would be ignored.  Make sure the bug doesn't
  20 # reappear.
  21
  22 # The test sets a breakpoint with the command break *void_func to set a
  23 # breakpoint on the first instruction of the function.  The issue is on
  24 # PowerPC it uses Global Entry Points (GEP) and Local Entry Points (LEP).
  25 # The GEP is the first instruction in the function.  It sets up register
  26 # r2 and then reaches the LEP.
  27 #
  28 #   <void_func>:
  29 #       lis     r2,4098        <- GEP
  30 #       addi    r2,r2,32512
  31 #       mflr    r0             <- LEP
  32 #       std     r0,16(r1)
  33 #        ....
  34
  35 #
  36 # The command break *void_func sets the breakpoint on the GEP.  Calling
  37 # the function with void_func() will enter the function via the LEP.  So,
  38 # this test needs to use a function pointer to call void_func() so the
  39 # function will be entered via the GEP to work as designed on PowerPC in
  40 # addition to non-PowerPC systems.  On non-PowerPC systems, the GEP and LEP
  41 # are the same.
  42
  43 require supports_reverse
  44
  45 standard_testfile
  46
  47 if { [prepare_for_testing "failed to prepare" "$testfile" $srcfile] } {
  48     return -1
  49 }
  50
  51 if {![runto_main]} {
  52     return 0
  53 }
  54
  55 if [supports_process_record] {
  56     # Activate process record/replay
  57     gdb_test_no_output "record" "turn on process record"
  58 }
  59
  60 # Start the test.
  61 set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"]
  62 gdb_test "tbreak void_func" \
  63     "Temporary breakpoint $decimal at .*$srcfile, line $breakloc\." \
  64     "set breakpoint on void_func"
  65 gdb_continue_to_breakpoint "void_func" ".*$srcfile:$breakloc.*"
  66
  67 # We stop at the brekapoint on void_func, but breakpoint on
  68 # *void_func will be set at the same place if function void_func doesn't
  69 # have prologue.  One step forward to avoid this.
  70 gdb_test "si"
  71
  72 gdb_test "break \*void_func" \
  73     "Breakpoint $decimal at .*" \
  74     "set breakpoint at void_func's entry"
  75
  76 gdb_test "reverse-finish" \
  77     ".*Breakpoint .*, void_func.*" \
  78     "reverse-finish from void_func trips breakpoint at entry"
  79
  80 gdb_test "frame" "#0  void_func.*" "no spurious proceed after breakpoint stop"