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# Copyright 2010-2020 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/>.
# This test only works on GNU/Linux.
if { ![isnative] || [is_remote host] || [use_gdb_stub]
|| ![istarget *-linux*] || [skip_shlib_tests]} {
continue
}
load_lib prelink-support.exp
standard_testfile .c
set genfile [standard_output_file ${testfile}-gen.h]
set executable $testfile
if {[build_executable_own_libs ${testfile}.exp $executable $srcfile [list additional_flags=-fPIE ldflags=-pie]] == ""} {
return -1
}
# Program Headers:
# Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
# LOAD 0x000000 0x0000000000400000 0x0000000000400000 0x134f5ec 0x134f5ec R E 0x200000
# LOAD 0x134f5f0 0x000000000194f5f0 0x000000000194f5f0 0x1dbc60 0x214088 RW 0x200000
# DYNAMIC 0x134f618 0x000000000194f618 0x000000000194f618 0x000200 0x000200 RW 0x8
#
proc read_phdr {binfile test} {
set readelf_program [gdb_find_readelf]
set command "exec $readelf_program -Wl $binfile"
verbose -log "command is $command"
set result [catch $command output]
verbose -log "result is $result"
verbose -log "output is $output"
if {$result != 0} {
fail $test
return
}
if ![regexp {\nProgram Headers:\n *Type [^\n]* Align\n(.*?)\n\n} $output trash phdr] {
fail "$test (no Program Headers)"
return
}
if ![regexp -line {^ *DYNAMIC +0x[0-9a-f]+ +(0x[0-9a-f]+) } $phdr trash dynamic_vaddr] {
fail "$test (no DYNAMIC found)"
return
}
verbose -log "dynamic_vaddr is $dynamic_vaddr"
set align_max -1
foreach {trash align} [regexp -line -all -inline {^ *LOAD .* (0x[0-9]+)$} $phdr] {
if {$align_max < $align} {
set align_max $align
}
}
verbose -log "align_max is $align_max"
if {$align_max == -1} {
fail "$test (no LOAD found)"
return
}
pass $test
return [list $dynamic_vaddr $align_max]
}
set phdr [read_phdr $binfile "readelf initial scan"]
set dynamic_vaddr [lindex $phdr 0]
set align_max [lindex $phdr 1]
set stub_size [format 0x%x [expr "2 * $align_max - ($dynamic_vaddr & ($align_max - 1))"]]
verbose -log "stub_size is $stub_size"
# On x86_64 it is commonly about 4MB.
if {$stub_size > 25000000} {
xfail "stub size $stub_size is too large"
return
}
set test "generate stub"
set command "exec $binfile $stub_size >$genfile"
verbose -log "command is $command"
set result [catch $command output]
verbose -log "result is $result"
verbose -log "output is $output"
if {$result == 0} {
pass $test
} else {
fail $test
}
set prelink_args [build_executable_own_libs ${test}.exp $executable $srcfile [list "additional_flags=-fPIE -DGEN=\"$genfile\"" "ldflags=-pie"]]
if {$prelink_args == ""} {
return -1
}
# x86_64 file has 25MB, no need to keep it.
file delete -- $genfile
set phdr [read_phdr $binfile "readelf rebuilt with stub_size"]
set dynamic_vaddr_prelinkno [lindex $phdr 0]
if ![prelink_yes $prelink_args] {
return -1
}
set phdr [read_phdr $binfile "readelf with prelink -R"]
set dynamic_vaddr_prelinkyes [lindex $phdr 0]
set first_offset [format 0x%x [expr $dynamic_vaddr_prelinkyes - $dynamic_vaddr_prelinkno]]
verbose -log "first_offset is $first_offset"
set test "first offset is non-zero"
if {$first_offset == 0} {
fail "$test (-fPIE -pie in effect?)"
} else {
pass $test
}
set test "start inferior"
gdb_exit
set test_spawn_id [remote_spawn host $binfile]
if { $test_spawn_id < 0 || $test_spawn_id == "" } {
perror "Spawning $binfile failed."
fail $test
return
}
set testpid [spawn_id_get_pid $test_spawn_id]
gdb_expect {
-re "sleeping\r\n" {
pass $test
}
eof {
fail "$test (eof)"
wait -i $test_spawn_id
return
}
timeout {
fail "$test (timeout)"
kill_wait_spawned_process $test_spawn_id
return
}
}
# Due to alignments it was reproducible with 1 on x86_64 but 2 on i686.
foreach align_mult {1 2} { with_test_prefix "shift-by-$align_mult" {
# FIXME: We believe there is enough room under FIRST_OFFSET.
set shifted_offset [format 0x%x [expr "$first_offset - $align_mult * $align_max"]]
verbose -log "shifted_offset is $shifted_offset"
# For normal prelink (prelink_yes call), we need to supply $prelink_args.
# For the prelink `-r' option below, $prelink_args is not required.
# Moreover, if it was used, the problem would not longer be reproducible
# as the libraries would also get relocated.
set command "exec /usr/sbin/prelink -q -N --no-exec-shield -r $shifted_offset $binfile"
verbose -log "command is $command"
set result [catch $command output]
verbose -log "result is $result"
verbose -log "output is $output"
set test "prelink -r"
if {$result == 0 && $output == ""} {
pass $test
} else {
fail $test
}
clean_restart $executable
set test "attach"
gdb_test_multiple "attach $testpid" $test {
-re "Attaching to program: .*, process $testpid\r\n" {
# Missing "$gdb_prompt $" is intentional.
pass $test
}
}
set test "error on Cannot access memory at address"
gdb_test_multiple "" $test {
-re "\r\nCannot access memory at address .*$gdb_prompt $" {
fail $test
}
-re "$gdb_prompt $" {
pass $test
}
}
gdb_test "detach" "Detaching from program: .*"
}}
kill_wait_spawned_process $test_spawn_id
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