gdb/testsuite/gdb.base/shreloc.exp

   1 # Copyright (C) 2003, 2005, 2007-2012 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
  17 # Tests for shared object file relocation. If two shared objects have
  18 # the same load address (actually, overlapping load spaces), one of
  19 # them gets relocated at load-time. Check that gdb gets the right
  20 # values for the debugging and minimal symbols.
  21
  22 if {[skip_shlib_tests]} {
  23     return 0
  24 }
  25
  26 #
  27 # This file uses shreloc.c, shreloc1.c and shreloc2.c
  28 #
  29
  30
  31 set workdir ${objdir}/${subdir}
  32 set testfile "shreloc"
  33 set libfile1 "shreloc1"
  34 set libfile2 "shreloc2"
  35 set srcfile $srcdir/$subdir/$testfile.c
  36 set lib1src $srcdir/$subdir/$libfile1.c
  37 set lib2src $srcdir/$subdir/$libfile2.c
  38 set binfile $objdir/$subdir/$testfile
  39 set lib1_sl $objdir/$subdir/$libfile1.sl
  40 set lib2_sl $objdir/$subdir/$libfile2.sl
  41
  42 if [get_compiler_info] {
  43     return -1
  44 }
  45
  46 set lib_opts "debug"
  47 set exec_opts [list debug shlib=$lib1_sl shlib=$lib2_sl]
  48
  49 if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
  50     lappend lib_opts "ldflags=-Wl,--image-base,0x04000000"
  51 }
  52
  53 if [test_compiler_info "xlc-*"] {
  54
  55     # IBM's xlc compiler does not add static variables to the ELF symbol
  56     # table by default.  We need this option to make the variables show
  57     # up in "maint print msymbols".
  58
  59     lappend lib_opts "additional_flags=-qstatsym"
  60
  61 }
  62
  63 if { [gdb_compile_shlib $lib1src $lib1_sl $lib_opts] != ""} {
  64     untested "Could not build $lib1_sl."
  65     return -1
  66 } elseif { [gdb_compile_shlib $lib2src $lib2_sl $lib_opts] != ""} {
  67     untested "Could not build $lib1_s2."
  68     return -1
  69 } elseif { [gdb_compile $srcfile $binfile executable $exec_opts] != ""} {
  70     untested "Could not build $binfile."
  71     return -1
  72 }
  73
  74 # Start with a fresh gdb.
  75
  76 gdb_exit
  77 gdb_start
  78 gdb_reinitialize_dir $srcdir/$subdir
  79 gdb_load ${workdir}/shreloc
  80 gdb_load_shlibs $lib1_sl $lib2_sl
  81
  82 # Load up the shared objects
  83 if ![runto_main] then {
  84     fail "Can't run to main"
  85     return 0
  86 }
  87
  88 proc get_var_address { var } {
  89     global gdb_prompt hex
  90
  91     # Match output like:
  92     # $1 = (int *) 0x0
  93     # $5 = (int (*)()) 0
  94     # $6 = (int (*)()) 0x24 <function_bar>
  95
  96     gdb_test_multiple "print &${var}" "get address of ${var}" {
  97         -re "\\\$\[0-9\]+ = \\(.*\\) (0|$hex)( <${var}>)?\[\r\n\]+${gdb_prompt} $"
  98         {
  99             pass "get address of ${var}"
 100             if { $expect_out(1,string) == "0" } {
 101                 return "0x0"
 102             } else {
 103                 return $expect_out(1,string)
 104             }
 105         }
 106     }
 107     return ""
 108 }
 109
 110 #
 111 # Check debugging symbol relocations
 112 #
 113
 114 # Check extern function for relocation
 115 set fn_1_addr [get_var_address fn_1]
 116 set fn_2_addr [get_var_address fn_2]
 117
 118 if { "${fn_1_addr}" == "${fn_2_addr}" } {
 119   fail "relocated extern functions have different addresses"
 120 } else {
 121   pass "relocated extern functions have different addresses"
 122 }
 123
 124 # Check extern var for relocation
 125 set extern_var_1_addr [get_var_address extern_var_1]
 126 set extern_var_2_addr [get_var_address extern_var_2]
 127
 128 if { "${extern_var_1_addr}" == "${extern_var_2_addr}" } {
 129   fail "relocated extern variables have different addresses"
 130 } else {
 131   pass "relocated extern variables have different addresses"
 132 }
 133
 134 # Check static var for relocation
 135 set static_var_1_addr [get_var_address static_var_1]
 136 set static_var_2_addr [get_var_address static_var_2]
 137
 138 if { "${static_var_1_addr}" == "${static_var_2_addr}" } {
 139   fail "relocated static variables have different addresses"
 140 } else {
 141   pass "relocated static variables have different addresses"
 142 }
 143
 144 #
 145 # Check minimal symbol relocations
 146 #
 147
 148 proc send_gdb_discard { command } {
 149     # Send a command to gdb and discard output up to the next prompt
 150
 151     global gdb_prompt
 152
 153     # Discard output
 154     gdb_test_multiple "${command}" "${command}" {
 155         -re ".*\[\r\n]+${gdb_prompt} $" {
 156             return 1
 157         }
 158         timeout {
 159             fail "{$command} (timeout)"
 160             return 0
 161         }
 162     }
 163 }
 164
 165 proc get_msym_addrs { var msymfile } {
 166     # Extract the list of values for symbols matching var in the
 167     # minimal symbol output file
 168
 169     global gdb_prompt hex
 170     set result ""
 171
 172     send_gdb "shell grep -E \" ${var}(\[ \t\]+.*)?\$\" ${msymfile}\n"
 173
 174     while 1 {
 175         gdb_expect {
 176             -re "\[\[\]\[ 0-9\]+\] . (${hex}) ${var}(\[ \t\]+\[^\r\n\]*)?\[\r\n\]+" {
 177                 set result [concat $result $expect_out(1,string)]
 178             }
 179
 180             -re "$gdb_prompt $" {
 181                 pass "get_msym_addrs ${var}"
 182                 return "${result}"
 183             }
 184
 185             -re "\[^\r\n\]*\[\r\n\]+" {
 186                 # Skip
 187             }
 188
 189             timeout {
 190                 fail "get_msym_addrs ${var} (timeout)"
 191                 return -1
 192             }
 193         }
 194     }
 195 }
 196
 197 proc check_same {var msymfile} {
 198     # Check that the minimal symbol values matching var are the same
 199
 200     set len [llength [lsort -unique [get_msym_addrs "${var}" "${msymfile}"]]]
 201
 202     if { $len == 1 } {
 203         return 1
 204     } else {
 205         return 0
 206     }
 207 }
 208
 209 proc check_different {var msymfile} {
 210     # Check that the minimal symbol values matching var are different
 211
 212     set addr_list [lsort [get_msym_addrs "${var}" "${msymfile}"]]
 213     set prev ""
 214
 215     if { [llength ${addr_list}] < 2 } {
 216         return 0
 217     }
 218
 219     foreach addr ${addr_list} {
 220         if { ${prev} == ${addr} } {
 221           return 0
 222         }
 223         set prev ${addr}
 224     }
 225
 226     return 1
 227 }
 228
 229 set msymfile "${workdir}/shreloc.txt"
 230
 231 if [send_gdb_discard "maint print msymbols ${msymfile}"] {
 232     if {[check_different "static_var_\[12\]" "${msymfile}"]} {
 233         pass "(msymbol) relocated static vars have different addresses"
 234     } else {
 235         fail "(msymbol) relocated static vars have different addresses"
 236     }
 237
 238     if {[check_different "extern_var_\[12\]" "${msymfile}"]} {
 239         pass "(msymbol) relocated extern vars have different addresses"
 240     } else {
 241         fail "(msymbol) relocated extern vars have different addresses"
 242     }
 243
 244     if {[check_different "fn_\[12\]" "${msymfile}"]} {
 245         pass "(msymbol) relocated functions have different addresses"
 246     } else {
 247         fail "(msymbol) relocated functions have different addresses"
 248     }
 249 }
 250
 251 if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
 252     #
 253     # We know the names of some absolute symbols included in the
 254     # portable-executable (DLL) format. Check that they didn't get
 255     # relocated.
 256     #
 257     # A better approach would be include absolute symbols via the assembler.
 258     #
 259     if {[check_same "_minor_os_version__" "${msymfile}"]} {
 260         pass "Absolute symbols not relocated"
 261     } else {
 262         fail "Absolute symbols not relocated"
 263     }
 264 }