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

   1 # Copyright 2014-2018 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 "failed to compile"
  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     global gdb_prompt
 100
 101     clean_restart ${exec1}
 102
 103     gdb_test_no_output "set breakpoint always-inserted $always_inserted"
 104
 105     if ![runto_main] then {
 106         fail "couldn't run to main"
 107         return -1
 108     }
 109
 110     # Set a second breakpoint (whose original address also ends up
 111     # unmmapped after the exec), for PR 19548.
 112     gdb_test "break some_function" "Breakpoint .*"
 113
 114     # PR17431: with always-inserted on, we'd see:
 115     #  (gdb) continue
 116     #  Continuing.
 117     #  Warning:
 118     #  Cannot insert breakpoint 1.
 119     #  Cannot access memory at address 0x10000ff
 120
 121     # PR 19548: with more than one breakpoint, we'd see:
 122     #  (gdb) continue
 123     #  Continuing.
 124     #  process (...) is executing new program: (...)/execl-update-breakpoints2
 125     #  Error in re-setting breakpoint 1: Warning:
 126     #  Cannot insert breakpoint 2.
 127     #  Cannot access memory at address 0x1000764
 128     set not_nl "\[^\r\n\]*"
 129     set regex ""
 130     append regex \
 131         "^continue\r\n" \
 132         "Continuing\\.\r\n" \
 133         "${not_nl} is executing new program: ${not_nl}\r\n" \
 134         "(Reading ${not_nl} from remote target\\.\\.\\.\r\n)*" \
 135         "\r\n" \
 136         "Breakpoint 1, main.*$gdb_prompt $"
 137     set message "continue across exec"
 138     gdb_test_multiple "continue" $message {
 139         -re $regex {
 140             pass $message
 141         }
 142     }
 143 }
 144
 145 foreach always_inserted { "off" "on" } {
 146     with_test_prefix "always-inserted $always_inserted" {
 147         test $always_inserted
 148     }
 149 }