blob: 3460f767c10f6b4aba1749124ec40cb83e99dbe5 [file] [log] [blame]
# Copyright 2010-2021 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
set test "break-interp"
set binprefix [standard_output_file ${test}]
# Only to get the $interp_system name.
set srcfile_test "start.c"
set binfile_test ${test}-test
set binfile_lib ${binprefix}.so
set srcfile "${test}-main.c"
set srcfile_lib "${test}-lib.c"
if [get_compiler_info] {
return -1
}
# Use -soname so that the new library gets copied by build_executable_own_libs.
if {[gdb_compile_shlib ${srcdir}/${subdir}/${srcfile_lib} ${binfile_lib} [list debug ldflags=-Wl,-soname,${test}.so]] != ""} {
return -1
}
if {[build_executable ${test}.exp $binfile_test ${srcfile_test} {}] == -1} {
return -1
}
# Note: The separate debug info file content build-id/crc32 are not verified
# contrary to the GDB search algorithm skipping non-matching ones.
proc system_debug_get {exec} {
global debug_root
set exec_build_id_debug [build_id_debug_filename_get $exec]
set debug_base "[file tail $exec].debug"
set exec_dir [file dirname $exec]
# isfile returns 1 even for symlinks to files.
set retval $debug_root/$exec_build_id_debug
if [file isfile $retval] {
return $retval
}
set retval $exec_dir/$debug_base
if [file isfile $retval] {
return $retval
}
set retval $exec_dir/.debug/$debug_base
if [file isfile $retval] {
return $retval
}
set retval $debug_root/$exec_dir/$debug_base
if [file isfile $retval] {
return $retval
}
return ""
}
gdb_exit
gdb_start
set debug_root ""
set test "show debug-file-directory"
gdb_test_multiple $test $test {
-re "The directory where separate debug symbols are searched for is \"(.*)\".\r\n$gdb_prompt $" {
set debug_root $expect_out(1,string)
}
}
set interp_system [section_get [standard_output_file $binfile_test] .interp]
clean_restart $interp_system
set dl_main_found 0
gdb_test_multiple "info addr dl_main" "" {
-re -wrap "Symbol \"dl_main\" is a function at address $hex\\." {
set dl_main_found 1
}
-re -wrap "Symbol \"dl_main\" is at $hex in a file compiled without debugging\\." {
set dl_main_found 1
}
-re -wrap "No symbol \"dl_main\" in current context\\." {
}
}
set interp_system_debug [system_debug_get $interp_system]
verbose -log "$interp_system has debug $interp_system_debug"
proc prelinkNO {arg {name ""}} {
return [prelink_no $arg $name]
}
proc prelinkYES {arg {name ""}} {
return [prelink_yes $arg $name]
}
proc strip_debug {dest} {
set test "strip [file tail $dest]"
set strip_program [transform strip]
set command "exec $strip_program --strip-debug $dest"
verbose -log "command is $command"
if [catch $command] {
fail $test
return 0
} else {
pass $test
return 1
}
}
# The marker function for the standard runtime linker interface is
# _dl_debug_state. The probes-based interface has no specific marker
# function; the probe we will stop on (init_start) is in dl_main so we
# check for that.
set solib_bp {(_dl_debug_state|dl_main)}
# Implementation of reach.
proc reach_1 {func command displacement} {
global gdb_prompt expect_out solib_bp
if {$func == $solib_bp} {
# Breakpoint on _dl_debug_state can have problems due to its overlap
# with the existing internal breakpoint from GDB.
gdb_test_no_output "set stop-on-solib-events 1"
} elseif {! [gdb_breakpoint $func allow-pending]} {
return
}
set test "reach"
set test_displacement "seen displacement message as $displacement"
set debug_state_count 0
gdb_test_multiple $command $test {
-re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " {
# Missing "$gdb_prompt $" is intentional.
if {$expect_out(1,string) == "0x0"} {
set case "ZERO"
} else {
set case "NONZERO"
}
if {$displacement == $case || $displacement == "PRESENT"} {
pass $test_displacement
set displacement "FOUND-$displacement"
} else {
fail $test_displacement
}
exp_continue
}
-re "Breakpoint \[0-9\]+, \\.?(__GI_)?$func \\(.*\\) at .*:\[0-9\]+\r\n.*$gdb_prompt $" {
if {$func == $solib_bp} {
fail $test
} else {
pass $test
}
}
-re "Breakpoint \[0-9\]+, \[0-9xa-f\]+ in \\.?(__GI_)?$func \\(\\).*\r\n$gdb_prompt $" {
if {$func == $solib_bp} {
fail $test
} else {
pass $test
}
}
-re "Stopped due to (spurious )?shared library event.*\r\n$gdb_prompt $" {
if {$func == $solib_bp} {
if {$debug_state_count == 0} {
# First stop does not yet relocate the _start function
# descriptor on ppc64.
set debug_state_count 1
send_gdb "continue\n"
exp_continue
} else {
pass $test
}
} else {
fail $test
}
}
}
if ![regexp {^(NONE|FOUND-.*)$} $displacement] {
fail $test_displacement
}
if {$func == $solib_bp} {
gdb_test_no_output "set stop-on-solib-events 0"
}
}
# `runto' does not check we stopped really at the function we specified.
# DISPLACEMENT can be "NONE" for no message to be present, "ZERO" for
# displacement of 0 bytes to be present, "NONZERO" for displacement of non-0
# bytes to be present and "PRESENT" if both "ZERO" and "NONZERO" are valid.
#
# The optional ITERATION parameter is used in order to make unique
# test prefixes, when calling this proc with the same FUNC name
# provide a unique ITERATION value for each call.
proc reach {func command displacement {iteration 1}} {
set prefix "reach-$func"
if { $iteration > 1 } {
set prefix "$prefix-$iteration"
}
with_test_prefix $prefix {
reach_1 $func $command $displacement
}
}
proc test_core {file displacement} {
with_test_prefix "core" {
global srcdir subdir gdb_prompt expect_out
set corefile [core_find $file {} "segv"]
if {$corefile == ""} {
return
}
gdb_exit
gdb_start
# Clear it to never find any separate debug infos in $debug_root.
gdb_test_no_output "set debug-file-directory" \
"set debug-file-directory for core"
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $file
# Print the "PIE (Position Independent Executable) displacement" message.
gdb_test_no_output "set verbose on"
set test "core loaded"
set test_displacement "seen displacement message as $displacement"
gdb_test_multiple "core-file $corefile" $test {
-re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " {
# Missing "$gdb_prompt $" is intentional.
if {$expect_out(1,string) == "0x0"} {
set case "ZERO"
} else {
set case "NONZERO"
}
if {$displacement == $case || $displacement == "PRESENT"} {
pass $test_displacement
set displacement "FOUND-$displacement"
} else {
fail $test_displacement
}
exp_continue
}
-re "Core was generated by .*\r\n#0 .*$gdb_prompt $" {
# Do not check the binary filename as it may be truncated.
pass $test
}
}
if ![regexp {^(NONE|FOUND-.*)$} $displacement] {
fail $test_displacement
}
gdb_test_no_output "set verbose off"
gdb_test "bt" "#\[0-9\]+ +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#\[0-9\]+ +\[^\r\n\]*\\mmain\\M.*" "core main bt"
}
}
proc test_attach_gdb {file pid displacement prefix} {
with_test_prefix "$prefix" {
global gdb_prompt expect_out
gdb_exit
gdb_start
# Print the "PIE (Position Independent Executable) displacement" message.
gdb_test_no_output "set verbose on"
gdb_test "file $file" "Reading symbols from .*" "file"
set test "attach"
gdb_test_multiple "attach $pid" $test {
-re "Attaching to (program: .*, )?process $pid\r\n" {
# Missing "$gdb_prompt $" is intentional.
pass $test
}
}
set test "attach final prompt"
set test_displacement "seen displacement message as $displacement"
gdb_test_multiple "" $test {
-re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " {
# Missing "$gdb_prompt $" is intentional.
if {$expect_out(1,string) == "0x0"} {
set case "ZERO"
} else {
set case "NONZERO"
}
if {$displacement == $case || $displacement == "PRESENT"} {
pass $test_displacement
set displacement "FOUND-$displacement"
} else {
fail $test_displacement
}
exp_continue
}
-re "$gdb_prompt $" {
pass $test
}
}
if ![regexp {^(NONE|FOUND-.*)$} $displacement] {
fail $test_displacement
}
gdb_test_no_output "set verbose off"
gdb_test "bt" "#\[0-9\]+ +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#\[0-9\]+ +\[^\r\n\]*\\mmain\\M.*" "attach main bt"
gdb_exit
}
}
proc test_attach {file displacement {relink_args ""}} {
global board_info
global exec
gdb_exit
set test "sleep function started"
set command "${file} sleep"
set test_spawn_id [remote_spawn host $command]
if { $test_spawn_id < 0 || $test_spawn_id == "" } {
perror "Spawning $command failed."
fail $test
return
}
set pid [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 $test_spawn_id
return
}
}
if {$relink_args == ""} {
test_attach_gdb $exec $pid $displacement "attach"
} else {
# These could be rather passed as arguments.
global interp_saved interp
foreach relink {YES NO} {
# Formerly this test was testing only prelinking of $EXEC. As the
# prelink command automatically prelinks all of $EXEC's libraries,
# even $INTERP got prelinked. Therefore, we formerly had to
# `[file_copy $interp_saved $interp]' to make $INTERP not affected
# by this prelinking of $EXEC.
#
# But now we need to test even prelinking of $INTERP. We could
# create a separate test to test just the $INTERP prelinking. For
# test simplicity, we merged this test and the test above by not
# restoring $INTERP after $EXEC prelink. $INTERP gets restored
# later below.
#
# `(wrong library or version mismatch?)' messages are printed for
# $binfile_lib on platforms converting REL->RELA relocations by
# prelink (such as on i386). There is no reliable way to verify
# the library file matches the running library in such case but
# GDB at least attempts to set the right displacement. We test
# `libfunc' is present in the backtrace and therefore the
# displacement has been guessed right.
if [prelink$relink $relink_args [file tail $exec]] {
# /proc/PID/exe cannot be loaded as it is "EXECNAME (deleted)".
test_attach_gdb $exec $pid $displacement "attach-relink$relink"
}
}
file_copy $interp_saved $interp
}
kill_wait_spawned_process $test_spawn_id
}
proc test_ld {file ifmain trynosym displacement} {
global srcdir subdir gdb_prompt expect_out inferior_exited_re solib_bp
global hex dl_main_found
# First test normal `file'-command loaded $FILE with symbols.
gdb_exit
gdb_start
# Clear it to never find any separate debug infos in $debug_root.
gdb_test_no_output "set debug-file-directory"
gdb_reinitialize_dir $srcdir/$subdir
gdb_load $file
# Print the "PIE (Position Independent Executable) displacement" message.
gdb_test_no_output "set verbose on"
# We want to test the re-run of a PIE in the case where the executable
# is loaded with a different displacement, but disable-randomization
# prevents that from happening. So turn it off.
gdb_test "set disable-randomization off"
if $ifmain {
gdb_test_no_output "set args segv"
} else {
global binfile_test
# ld.so needs some executable to run to reach _dl_debug_state.
gdb_test_no_output "set args [standard_output_file $binfile_test]" \
"set args OBJDIR/${subdir}/$binfile_test"
}
reach $solib_bp "run" $displacement 1
with_test_prefix "first backtrace" {
gdb_test_no_output "set verbose off"
gdb_test_multiple "bt" "dl bt" {
-re -wrap "#0 +\[^\r\n\]*\\m(__GI_)?$solib_bp\\M.*" {
pass $gdb_test_name
}
-re -wrap "#0 ($hex) .*" {
if { $dl_main_found } {
fail $gdb_test_name
} else {
set pc $expect_out(1,string)
regsub "0x0*" $pc "" pc
gdb_test "p /x 0x$pc" ".*"
gdb_test_multiple "info probes stap rtld" $gdb_test_name {
-re -wrap "(?:init_start|init_complete) +0x0*$pc .*" {
pass $gdb_test_name
}
-re -wrap "" {
fail $gdb_test_name
}
}
}
}
}
gdb_test_no_output "set verbose on"
}
if $ifmain {
reach "main" continue "NONE"
reach "libfunc" continue "NONE"
with_test_prefix "second backtrace" {
gdb_test_no_output "set verbose off"
gdb_test "bt" "#0 +\[^\r\n\]*\\mlibfunc\\M\[^\r\n\]*\r\n#1 +\[^\r\n\]*\\mmain\\M.*" "main bt"
gdb_test_no_output "set verbose on"
}
}
# Try re-run if the new PIE displacement takes effect.
gdb_test "kill" "" "kill" {Kill the program being debugged\? \(y or n\) } "y"
reach $solib_bp "run" $displacement 2
gdb_test_no_output "set verbose off"
if $ifmain {
test_core $file $displacement
test_attach $file $displacement
}
if !$trynosym {
return
}
with_test_prefix "symbol-less" {
# Test also `exec-file'-command loaded $FILE - therefore
# without symbols. SYMBOL_OBJFILE is not available and only
# EXEC_BFD must be used.
gdb_exit
gdb_start
# Clear it to never find any separate debug infos in $debug_root.
gdb_test_no_output "set debug-file-directory"
gdb_reinitialize_dir $srcdir/$subdir
# Print the "PIE (Position Independent Executable)
# displacement" message.
gdb_test_no_output "set verbose on"
# Test no (error) message has been printed by `exec-file'.
set escapedfile [string_to_regexp $file]
gdb_test "exec-file $file" "exec-file $escapedfile" "load"
if $ifmain {
reach $solib_bp run $displacement 3
# Use two separate gdb_test_multiple statements to avoid timeouts due
# to slow processing of wildcard capturing long output
set test "info files"
set entrynohex ""
set info_line [join [list \
"\r\n" "\[\t\]" "0x\[0-9af\]+" " - " \
"0x\[0-9af\]+" " @ " "0x\[0-9af\]+" \
" is " "\[^\r\n\]+"] ""]
gdb_test_multiple $test $test {
-re "\r\n\[\t \]*Entry point:\[\t \]*0x(\[0-9a-f\]+)\r\n" {
set entrynohex $expect_out(1,string)
gdb_test_multiple "" $test {
-re "\r\n$gdb_prompt $" {
pass $test
}
-re $info_line {
# Avoid timeout with check-read1
exp_continue
}
}
}
}
# `info sym' cannot be tested for .opd as the binary may not have
# symbols.
if {[istarget powerpc64-*] && [is_lp64_target]} {
set test "convert entry point"
gdb_test_multiple "p *(void(*)(void) *) 0x$entrynohex" $test {
-re " =( \\(\[^0-9\]*\\))? 0x(\[0-9a-f\]+)( < \[^\r\n\]*)?\r\n$gdb_prompt $" {
set entrynohex $expect_out(2,string)
pass $test
}
}
}
if {$entrynohex != ""} {
gdb_test "break *0x$entrynohex" "" "break at entry point"
gdb_test "continue" "\r\nBreakpoint \[0-9\]+, 0x0*$entrynohex in .*" "entry point reached"
}
} else {
# There is no symbol to break at ld.so. Moreover it can
# exit with an error code.
set test "ld.so exit"
set test_displacement "seen displacement message as $displacement"
gdb_test_multiple "run" $test {
-re "Using PIE \\(Position Independent Executable\\) displacement (0x\[0-9a-f\]+) " {
# Missing "$gdb_prompt $" is intentional.
if {$expect_out(1,string) == "0x0"} {
set case "ZERO"
} else {
set case "NONZERO"
}
if {$displacement == $case || $displacement == "PRESENT"} {
pass $test_displacement
set displacement "FOUND-$displacement"
} else {
fail $test_displacement
}
exp_continue
}
-re "$inferior_exited_re (normally|with code \[0-9\]+).\r\n$gdb_prompt $" {
# Do not check the binary filename as it may be truncated.
pass $test
}
}
if ![regexp {^(NONE|FOUND-.*)$} $displacement] {
fail $test_displacement
}
}
gdb_test_no_output "set verbose off"
}
}
# Create separate binaries for each testcase - to make the possible reported
# problem reproducible after the whole test run finishes.
foreach_with_prefix ldprelink {NO YES} {
foreach_with_prefix ldsepdebug {NO IN SEP} {
# Skip running the ldsepdebug test if we do not have system separate
# debug info available.
if {$interp_system_debug == "" && $ldsepdebug == "SEP"} {
continue
}
set ldname "LDprelink${ldprelink}debug${ldsepdebug}"
set interp $binprefix-$ldname
# prelink needs to always prelink all the dependencies to do any file
# modifications of its files. ld.so also needs all the dependencies to
# be prelinked to omit the relocation process. In-memory file offsets
# are not dependent whether ld.so went the prelink way or through the
# relocation process.
#
# For GDB we are not interested whether prelink succeeds as it is
# transparent to GDB. GDB is being tested for differences of file
# offsets vs. in-memory offsets. So we have to prelink even ld.so for
# the BIN modification to happen but we need to restore the original
# possibly unprelinked ld.so to test all the combinations for GDB.
set interp_saved ${interp}-saved
if {$ldsepdebug == "NO"} {
file_copy $interp_system $interp
# Never call strip-debug before unprelink:
# prelink: ...: Section .note.gnu.build-id created after prelinking
if ![prelinkNO $interp] {
continue
}
strip_debug $interp
} elseif {$ldsepdebug == "IN" && $interp_system_debug == ""} {
file_copy $interp_system $interp
} elseif {$ldsepdebug == "IN" && $interp_system_debug != ""} {
file_copy $interp_system $interp
file_copy $interp_system_debug "${interp}.debug"
# eu-unstrip: DWARF data in '...' not adjusted for prelinking bias; consider prelink -u
if {![prelinkNO $interp] || ![prelinkNO "${interp}.debug"]} {
continue
}
set test "eu-unstrip unprelinked:[file tail $interp_system] + [file tail $interp_system_debug] to [file tail $interp]"
set command "exec eu-unstrip -o $interp $interp ${interp}.debug"
verbose -log "command is $command"
if [catch $command] {
setup_xfail *-*-*
fail $test
continue
} else {
pass $test
}
} elseif {$ldsepdebug == "SEP" && $interp_system_debug == ""} {
file_copy $interp_system $interp
# eu-unstrip: DWARF data in '...' not adjusted for prelinking bias; consider prelink -u
if ![prelinkNO $interp] {
continue
}
gdb_gnu_strip_debug $interp
} elseif {$ldsepdebug == "SEP" && $interp_system_debug != ""} {
file_copy $interp_system $interp
file_copy $interp_system_debug "${interp}.debug"
}
if {$ldsepdebug == "SEP"} {
if ![prelinkNO "${interp}.debug"] {
continue
}
} else {
file delete "${interp}.debug"
}
if ![prelink$ldprelink $interp "[file tail $interp], second time"] {
continue
}
if {$ldprelink == "NO"} {
set displacement "NONZERO"
} else {
# x86* kernel loads prelinked PIE binary at its
# prelinked address but ppc* kernel loads it at a
# random address. prelink normally skips PIE binaries
# during the system scan.
set displacement "PRESENT"
}
test_ld $interp 0 [expr {$ldsepdebug == "NO"}] $displacement
if ![file_copy $interp $interp_saved] {
continue
}
foreach_with_prefix binprelink {NO YES} {
foreach_with_prefix binsepdebug {NO IN SEP} {
# "ATTACH" is like "YES" but it is modified during
# run. It cannot be used for problem
# reproducibility after the testcase ends.
foreach_with_prefix binpie {NO YES ATTACH} {
# This combination is not possible, non-PIE (fixed address)
# binary cannot be prelinked to any (other) address.
if {$binprelink == "YES" && $binpie == "NO"} {
continue
}
set binname "BINprelink${binprelink}debug${binsepdebug}pie${binpie}"
set exec $binprefix-$binname
set opts "ldflags=-Wl,$binfile_lib,-rpath,[file dirname $binfile_lib]"
if {$binsepdebug != "NO"} {
lappend opts {debug}
}
if {$binpie != "NO"} {
lappend opts {pie}
} else {
# Debian9/Ubuntu16.10 onwards default to PIE enabled. Ensure it is disabled.
lappend opts {nopie}
}
set dir ${exec}.d
set relink_args [build_executable_own_libs ${test}.exp [file tail $exec] $srcfile $opts $interp $dir]
if {$relink_args == ""} {
continue
}
if {$binsepdebug == "SEP"} {
gdb_gnu_strip_debug $exec
}
if {$binpie == "NO"} {
set displacement "NONE"
} elseif {$binprelink == "NO"} {
set displacement "NONZERO"
} else {
# x86* kernel loads prelinked PIE binary at its prelinked
# address but ppc* kernel loads it at a random address.
# prelink normally skips PIE binaries during the system scan.
set displacement "PRESENT"
}
if {[prelink$binprelink $relink_args [file tail $exec]]
&& [file_copy $interp_saved $interp]} {
# In order to make test names unique wrap the core of this if block
# with a test prefix. Some of the tests performed in the if
# condition are repeated within this body.
with_test_prefix "INNER" {
if {$binpie != "ATTACH"} {
test_ld $exec 1 [expr {$binsepdebug == "NO"}] $displacement
} else {
# If the file has been randomly prelinked it must be
# "NONZERO". We could see "ZERO" only if it was unprelinked
# and it is now running at the same address - which is 0 but
# executable can never run at address 0.
set displacement "NONZERO"
test_attach $exec $displacement $relink_args
# ATTACH means that executables and libraries have been
# modified after they have been run. They cannot be reused
# for problem reproducibility after the testcase ends in
# the ATTACH case. Therefore they are rather deleted not
# to confuse after the run finishes.
set exec_debug [system_debug_get $exec]
if {$exec_debug != ""} {
# `file delete [glob "${exec_debug}*"]' does not work.
foreach f [glob "${exec_debug}*"] {
file delete $f
}
}
file delete -force $dir
# `file delete [glob "${exec}*"]' does not work.
foreach f [glob "${exec}*"] {
file delete $f
}
}
}
}
}
}
}
file delete $interp_saved
}
}