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# Copyright 2015-2024 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/>.
standard_testfile
require {is_any_target i?86-*-* x86_64-*-*}
set default_pkru_re 0x0
if { [istarget *-*-linux*] } {
# Starting with v4.9, the linux kernel contains commit acd547b29880
# ("x86/pkeys: Default to a restrictive init PKRU"), which sets the
# pkru register to 0x55555554 by default.
set default_pkru_re (0x0|0x55555554)
}
set comp_flags "-I${srcdir}/../nat/"
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
[list debug additional_flags=${comp_flags}]] } {
untested "failed to compile x86 PKEYS test."
return -1
}
if ![runto_main] {
return -1
}
set supports_pkru 0
set test "probe PKRU support"
gdb_test_multiple "print have_pkru()" $test {
-re ".. = 1\r\n$gdb_prompt $" {
pass $test
set supports_pkru 1
}
-re ".. = 0\r\n$gdb_prompt $" {
pass $test
}
}
if { !$supports_pkru } {
unsupported "processor does not support protection key feature."
return
}
# Linux kernel versions 5.14.0 to 6.1.x contain a regression related to writing
# the PKRU using ptrace, see commit 4a804c4f8356 ("x86/fpu: Allow PKRU to be
# (once again) written by ptrace.").
set have_xfail 0
set v [linux_kernel_version]
if { $v != {} } {
set have_xfail \
[expr \
[version_compare [list 5 14 0] <= $v] \
&& [version_compare $v < [list 6 2 0]]]
}
# Test pkru register at startup
gdb_test "print /x \$pkru" "= $default_pkru_re" "pkru register"
# Read values from pseudo registers.
gdb_breakpoint [ gdb_get_line_number "break here 1" ]
gdb_continue_to_breakpoint "break here 1" ".*break here 1.*"
set val1 0x12345678
gdb_test "info register pkru" ".*pkru.*$val1.*" "read pkru register"
set val2 0x44444444
gdb_test "print /x \$pkru = $val2" "= $val2" "set pkru value"
gdb_test_multiple "info register pkru" "read value after setting value" {
-re -wrap ".*pkru.*$val2.*" {
pass $gdb_test_name
}
-re -wrap ".*pkru.*$val1.*" {
if { $have_xfail } {
xfail $gdb_test_name
} else {
fail $gdb_test_name
}
}
}
gdb_breakpoint [ gdb_get_line_number "break here 2" ]
gdb_continue_to_breakpoint "break here 2" ".*break here 2.*"
gdb_test_multiple "print /x rd_value" "variable after reading pkru" {
-re -wrap "= $val2" {
pass $gdb_test_name
}
-re -wrap "= $val1" {
if { $have_xfail } {
xfail $gdb_test_name
} else {
fail $gdb_test_name
}
}
}
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