gdb/testsuite/gdb.base/breakpoint-in-ro-region.exp

   1 # Copyright 2014 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 standard_testfile
  19
  20 if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
  21     return -1
  22 }
  23
  24 if ![runto main] {
  25     return -1
  26 }
  27
  28 delete_breakpoints
  29
  30 # Get the bounds of a function, and write them to FUNC_LO (inclusive),
  31 # FUNC_HI (exclusive).  Return true on success and false on failure.
  32 proc get_function_bounds {function func_lo func_hi} {
  33     global gdb_prompt
  34     global hex decimal
  35
  36     upvar $func_lo lo
  37     upvar $func_hi hi
  38
  39     set lo ""
  40     set size ""
  41
  42     set test "get lo address of $function"
  43     gdb_test_multiple "disassemble $function" $test {
  44         -re "($hex) .*$hex <\\+($decimal)>:\[^\r\n\]+\r\nEnd of assembler dump\.\r\n$gdb_prompt $" {
  45             set lo $expect_out(1,string)
  46             set size $expect_out(2,string)
  47             pass $test
  48         }
  49     }
  50
  51     if { $lo == "" || $size == "" } {
  52         return false
  53     }
  54
  55     # Account for the size of the last instruction.
  56     set test "get hi address of $function"
  57     gdb_test_multiple "x/2i $function+$size" $test {
  58         -re ".*$hex <$function\\+$size>:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
  59             set hi $expect_out(1,string)
  60             pass $test
  61         }
  62     }
  63
  64     if { $hi == "" } {
  65         return false
  66     }
  67
  68     # Remove unnecessary leading 0's (0x00000ADDR => 0xADDR) so we can
  69     # easily do matches.  Disassemble includes leading zeros, while
  70     # x/i doesn't.
  71     regsub -all "0x0\+" $lo "0x" lo
  72     regsub -all "0x0\+" $hi "0x" hi
  73
  74     return true
  75 }
  76
  77 # Get the address where the thread is currently stopped.
  78 proc get_curr_insn {} {
  79     global gdb_prompt
  80     global hex
  81
  82     set pc ""
  83     set test "get current insn"
  84     gdb_test_multiple "p /x \$pc" $test {
  85         -re " = ($hex)\r\n$gdb_prompt $" {
  86             set pc $expect_out(1,string)
  87             pass $test
  88         }
  89     }
  90
  91     return $pc
  92 }
  93
  94 # Get the address of where a single-step should land.
  95 proc get_next_insn {} {
  96     global gdb_prompt
  97     global hex
  98
  99     set next ""
 100     set test "get next insn"
 101     gdb_test_multiple "x/2i \$pc" $test {
 102         -re "$hex .*:\[^\r\n\]+\r\n\[ \]+($hex).*\.\r\n$gdb_prompt $" {
 103             set next $expect_out(1,string)
 104             pass $test
 105         }
 106     }
 107
 108     return $next
 109 }
 110
 111
 112 if ![get_function_bounds "main" main_lo main_hi] {
 113     # Can't do the following tests if main's bounds are unknown.
 114     return -1
 115 }
 116
 117 # Manually create a read-only memory region that covers 'main'.
 118 gdb_test_no_output "mem $main_lo $main_hi ro" \
 119     "create read-only mem region covering main"
 120
 121 # So that we don't fail inserting breakpoints on addresses outside
 122 # main, like the internal event breakpoints.
 123 gdb_test_no_output "set mem inaccessible-by-default off"
 124
 125 # So we get an immediate warning/error without needing to resume the
 126 # target.
 127 gdb_test_no_output "set breakpoint always-inserted on"
 128
 129 # Disable the automatic fallback to HW breakpoints.  We want a
 130 # software breakpoint to be attempted, and to fail.
 131 gdb_test_no_output "set breakpoint auto-hw off"
 132
 133 # Confirm manual writes to the read-only memory region fail.
 134 gdb_test "p /x *(char *) $main_lo = 1" \
 135     "Cannot access memory at address $main_lo" \
 136     "writing to read-only memory fails"
 137
 138 # Ensure that inserting a software breakpoint in a known-read-only
 139 # region fails.
 140 gdb_test "break *$main_lo" \
 141     "Cannot insert breakpoint .*Cannot set software breakpoint at read-only address $main_lo.*" \
 142     "inserting software breakpoint in read-only memory fails"