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

   1 # Copyright 2014-2024 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 # 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 if { [gdb_compile $objfile $exec1 executable {debug text_segment=0x1000000}] != ""
  36      || [gdb_compile $objfile $exec2 executable {debug text_segment=0x2000000}] != ""} {
  37     untested "link failed"
  38     return -1
  39 }
  40
  41 # First check whether the address of "main" in exec1 is readable in
  42 # exec2.  If it is, then skip the test as unsupported.
  43
  44 clean_restart ${exec1}
  45 if {![runto_main]} {
  46     return -1
  47 }
  48
  49 set addr ""
  50 set test "main address first"
  51 gdb_test_multiple "p/x &main" $test {
  52     -re " = (0x\[0-9a-f\]+)\r\n$gdb_prompt $" {
  53         set addr $expect_out(1,string)
  54         pass $test
  55     }
  56 }
  57
  58 clean_restart ${exec2}
  59 if {![runto_main]} {
  60     return -1
  61 }
  62
  63 set cannot_access 0
  64 set test "probe memory access"
  65 gdb_test_multiple "x $addr" $test {
  66     -re "Cannot access memory at address .*$gdb_prompt $" {
  67         set cannot_access 1
  68         pass $test
  69     }
  70     -re ".*$gdb_prompt $" {
  71         pass $test
  72     }
  73 }
  74
  75 if {!$cannot_access} {
  76     unsupported "main address is readable in second binary"
  77     return
  78 }
  79
  80 # The test proper.  ALWAYS_INSERTED indicates whether testing in
  81 # "breakpoint always-inserted" mode.
  82
  83 proc test { always_inserted } {
  84     global exec1
  85     global gdb_prompt
  86
  87     clean_restart ${exec1}
  88
  89     gdb_test_no_output "set breakpoint always-inserted $always_inserted"
  90
  91     if {![runto_main]} {
  92         return -1
  93     }
  94
  95     # Set a second breakpoint (whose original address also ends up
  96     # unmmapped after the exec), for PR 19548.
  97     gdb_test "break some_function" "Breakpoint .*"
  98
  99     # PR17431: with always-inserted on, we'd see:
 100     #  (gdb) continue
 101     #  Continuing.
 102     #  Warning:
 103     #  Cannot insert breakpoint 1.
 104     #  Cannot access memory at address 0x10000ff
 105
 106     # PR 19548: with more than one breakpoint, we'd see:
 107     #  (gdb) continue
 108     #  Continuing.
 109     #  process (...) is executing new program: (...)/execl-update-breakpoints2
 110     #  Error in re-setting breakpoint 1: Warning:
 111     #  Cannot insert breakpoint 2.
 112     #  Cannot access memory at address 0x1000764
 113     set not_nl "\[^\r\n\]*"
 114     set regex ""
 115     append regex \
 116         "^continue\r\n" \
 117         "Continuing\\.\r\n" \
 118         "${not_nl} is executing new program: ${not_nl}\r\n" \
 119         "(Reading ${not_nl} from remote target\\.\\.\\.\r\n)*" \
 120         "(?:.Thread debugging using .*? enabled.\r\nUsing .*? library .*?\\.\r\n)?" \
 121         "\r\n" \
 122         "Breakpoint 1, main.*$gdb_prompt $"
 123     set message "continue across exec"
 124     gdb_test_multiple "continue" $message {
 125         -re $regex {
 126             pass $message
 127         }
 128     }
 129 }
 130
 131 foreach always_inserted { "off" "on" } {
 132     with_test_prefix "always-inserted $always_inserted" {
 133         test $always_inserted
 134     }
 135 }