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# Copyright (C) 2003-2013 Free Software Foundation, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Tests for shared object file relocation. If two shared objects have
# the same load address (actually, overlapping load spaces), one of
# them gets relocated at load-time. Check that gdb gets the right
# values for the debugging and minimal symbols.
if {[skip_shlib_tests]} {
return 0
}
#
# This file uses shreloc.c, shreloc1.c and shreloc2.c
#
standard_testfile .c shreloc1.c shreloc2.c
set srcfile $srcdir/$subdir/$srcfile
set lib1src $srcdir/$subdir/$srcfile2
set lib2src $srcdir/$subdir/$srcfile3
set binfile [standard_output_file $testfile]
set lib1_sl [standard_output_file shreloc1.sl]
set lib2_sl [standard_output_file shreloc2.sl]
if [get_compiler_info] {
return -1
}
set lib_opts "debug"
set exec_opts [list debug shlib=$lib1_sl shlib=$lib2_sl]
if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
lappend lib_opts "ldflags=-Wl,--image-base,0x04000000"
}
if [test_compiler_info "xlc-*"] {
# IBM's xlc compiler does not add static variables to the ELF symbol
# table by default. We need this option to make the variables show
# up in "maint print msymbols".
lappend lib_opts "additional_flags=-qstatsym"
}
if { [gdb_compile_shlib $lib1src $lib1_sl $lib_opts] != ""} {
untested "Could not build $lib1_sl."
return -1
} elseif { [gdb_compile_shlib $lib2src $lib2_sl $lib_opts] != ""} {
untested "Could not build $lib1_s2."
return -1
} elseif { [gdb_compile $srcfile $binfile executable $exec_opts] != ""} {
untested "Could not build $binfile."
return -1
}
# Start with a fresh gdb.
clean_restart $binfile
gdb_load_shlibs $lib1_sl $lib2_sl
# Load up the shared objects
if ![runto_main] then {
fail "Can't run to main"
return 0
}
proc get_var_address { var } {
global gdb_prompt hex
# Match output like:
# $1 = (int *) 0x0
# $5 = (int (*)()) 0
# $6 = (int (*)()) 0x24 <function_bar>
gdb_test_multiple "print &${var}" "get address of ${var}" {
-re "\\\$\[0-9\]+ = \\(.*\\) (0|$hex)( <${var}>)?\[\r\n\]+${gdb_prompt} $"
{
pass "get address of ${var}"
if { $expect_out(1,string) == "0" } {
return "0x0"
} else {
return $expect_out(1,string)
}
}
}
return ""
}
#
# Check debugging symbol relocations
#
# Check extern function for relocation
set fn_1_addr [get_var_address fn_1]
set fn_2_addr [get_var_address fn_2]
if { "${fn_1_addr}" == "${fn_2_addr}" } {
fail "relocated extern functions have different addresses"
} else {
pass "relocated extern functions have different addresses"
}
# Check extern var for relocation
set extern_var_1_addr [get_var_address extern_var_1]
set extern_var_2_addr [get_var_address extern_var_2]
if { "${extern_var_1_addr}" == "${extern_var_2_addr}" } {
fail "relocated extern variables have different addresses"
} else {
pass "relocated extern variables have different addresses"
}
# Check static var for relocation
set static_var_1_addr [get_var_address static_var_1]
set static_var_2_addr [get_var_address static_var_2]
if { "${static_var_1_addr}" == "${static_var_2_addr}" } {
fail "relocated static variables have different addresses"
} else {
pass "relocated static variables have different addresses"
}
#
# Check minimal symbol relocations
#
proc send_gdb_discard { command } {
# Send a command to gdb and discard output up to the next prompt
global gdb_prompt
# Discard output
gdb_test_multiple "${command}" "${command}" {
-re ".*\[\r\n]+${gdb_prompt} $" {
return 1
}
timeout {
fail "{$command} (timeout)"
return 0
}
}
}
proc get_msym_addrs { var msymfile } {
# Extract the list of values for symbols matching var in the
# minimal symbol output file
global gdb_prompt hex
set result ""
send_gdb "shell grep -E \" ${var}(\[ \t\]+.*)?\$\" ${msymfile}\n"
while 1 {
gdb_expect {
-re "\[\[\]\[ 0-9\]+\] . (${hex}) ${var}(\[ \t\]+\[^\r\n\]*)?\[\r\n\]+" {
set result [concat $result $expect_out(1,string)]
}
-re "$gdb_prompt $" {
pass "get_msym_addrs ${var}"
return "${result}"
}
-re "\[^\r\n\]*\[\r\n\]+" {
# Skip
}
timeout {
fail "get_msym_addrs ${var} (timeout)"
return -1
}
}
}
}
proc check_same {var msymfile} {
# Check that the minimal symbol values matching var are the same
set len [llength [lsort -unique [get_msym_addrs "${var}" "${msymfile}"]]]
if { $len == 1 } {
return 1
} else {
return 0
}
}
proc check_different {var msymfile} {
# Check that the minimal symbol values matching var are different
set addr_list [lsort [get_msym_addrs "${var}" "${msymfile}"]]
set prev ""
if { [llength ${addr_list}] < 2 } {
return 0
}
foreach addr ${addr_list} {
if { ${prev} == ${addr} } {
return 0
}
set prev ${addr}
}
return 1
}
set msymfile [standard_output_file shreloc.txt]
if [send_gdb_discard "maint print msymbols ${msymfile}"] {
if {[check_different "static_var_\[12\]" "${msymfile}"]} {
pass "(msymbol) relocated static vars have different addresses"
} else {
fail "(msymbol) relocated static vars have different addresses"
}
if {[check_different "extern_var_\[12\]" "${msymfile}"]} {
pass "(msymbol) relocated extern vars have different addresses"
} else {
fail "(msymbol) relocated extern vars have different addresses"
}
if {[check_different "fn_\[12\]" "${msymfile}"]} {
pass "(msymbol) relocated functions have different addresses"
} else {
fail "(msymbol) relocated functions have different addresses"
}
}
if {([istarget "*pc-cygwin"] || [istarget "*pc-mingw32"]) } {
#
# We know the names of some absolute symbols included in the
# portable-executable (DLL) format. Check that they didn't get
# relocated.
#
# A better approach would be include absolute symbols via the assembler.
#
if {[check_same "_minor_os_version__" "${msymfile}"]} {
pass "Absolute symbols not relocated"
} else {
fail "Absolute symbols not relocated"
}
}
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