gdb/testsuite/gdb.base/execl-update-breakpoints.exp

   1 # Copyright 2014-2016 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 # Test that when following an exec, we don't try to insert breakpoints
  17 # in the new image at the addresses the symbols had before the exec.
  18
  19 standard_testfile
  20
  21 # Build two copies of the program, each linked at a different address.
  22 # The address of "main" in the first binary should end up being an
  23 # unmapped address in the second binary.
  24
  25 set objfile ${binfile}.o
  26 set exec1 ${binfile}1
  27 set exec2 ${binfile}2
  28
  29 if { [gdb_compile [file join $srcdir $subdir $srcfile] $objfile \
  30           object [list debug]] != "" } {
  31     untested "compile failed"
  32     return -1
  33 }
  34
  35 set opts1_ld [list debug ldflags=-Wl,-Ttext-segment=0x1000000]
  36 set opts1_gold [list debug ldflags=-Wl,-Ttext=0x1000000]
  37 set opts2_ld [list debug ldflags=-Wl,-Ttext-segment=0x2000000]
  38 set opts2_gold [list debug ldflags=-Wl,-Ttext=0x2000000]
  39
  40 if { [gdb_compile $objfile $exec1 executable $opts1_ld] != "" } {
  41     # Old gold linker versions don't support -Ttext-segment.  Fall
  42     # back to -Ttext.
  43     if { [gdb_compile $objfile $exec1 executable $opts1_gold] != ""
  44          || [gdb_compile $objfile $exec2 executable $opts2_gold] != ""} {
  45         untested "link failed"
  46         return -1
  47     }
  48 } elseif { [gdb_compile $objfile $exec2 executable $opts2_ld] != "" } {
  49     untested "link failed"
  50     return -1
  51 }
  52
  53 # First check whether the address of "main" in exec1 is readable in
  54 # exec2.  If it is, then skip the test as unsupported.
  55
  56 clean_restart ${exec1}
  57 if ![runto_main] then {
  58     fail "Couldn't run to main"
  59     return -1
  60 }
  61
  62 set addr ""
  63 set test "main address first"
  64 gdb_test_multiple "p/x &main" $test {
  65     -re " = (0x\[0-9a-f\]+)\r\n$gdb_prompt $" {
  66         set addr $expect_out(1,string)
  67         pass $test
  68     }
  69 }
  70
  71 clean_restart ${exec2}
  72 if ![runto_main] then {
  73     fail "Couldn't run to main"
  74     return -1
  75 }
  76
  77 set cannot_access 0
  78 set test "probe memory access"
  79 gdb_test_multiple "x $addr" $test {
  80     -re "Cannot access memory at address .*$gdb_prompt $" {
  81         set cannot_access 1
  82         pass $test
  83     }
  84     -re ".*$gdb_prompt $" {
  85         pass $test
  86     }
  87 }
  88
  89 if {!$cannot_access} {
  90     unsupported "main address is readable in second binary"
  91     return
  92 }
  93
  94 # The test proper.  ALWAYS_INSERTED indicates whether testing in
  95 # "breakpoint always-inserted" mode.
  96
  97 proc test { always_inserted } {
  98     global exec1
  99
 100     clean_restart ${exec1}
 101
 102     gdb_test_no_output "set breakpoint always-inserted $always_inserted"
 103
 104     if ![runto_main] then {
 105         fail "Couldn't run to main"
 106         return -1
 107     }
 108
 109     # On a buggy GDB, with always-inserted on, we'd see:
 110     #  (gdb) continue
 111     #  Continuing.
 112     #  Warning:
 113     #  Cannot insert breakpoint 1.
 114     #  Cannot access memory at address 0x10000ff
 115     gdb_test "continue" "Breakpoint 1, main.*" "continue across exec"
 116 }
 117
 118 foreach always_inserted { "off" "on" } {
 119     with_test_prefix "always-inserted $always_inserted" {
 120         test $always_inserted
 121     }
 122 }