1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
185 lines
6 KiB
Text
185 lines
6 KiB
Text
# Copyright 2018-2024 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# This file is part of the gdb testsuite.
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# Test initial values of x87 control registers, before any x87
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# instructions have been executed in the inferior.
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require is_amd64_regs_target
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standard_testfile .S
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set options [list debug \
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additional_flags=-static \
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additional_flags=-nostartfiles]
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if { [build_executable "failed to prepare" ${testfile} ${srcfile} $options] } {
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return -1
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}
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# Start the test file, and check the x87 control registers (and
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# mxcsr), we expect the default values in all registers.
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#
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# Step forward until the x87 unit is enabled, recheck the register
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# values; they should still have the default values.
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#
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# Finally, step forward until the x87 state has changed, and then
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# recheck the register state to view the changes.
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proc_with_prefix check_x87_regs_around_init {} {
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global binfile
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clean_restart ${binfile}
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# Get things started.
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if {![runto_main]} {
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return 0
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}
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# Check initial values of x87 control registers. The MXCSR isn't part
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# of the x87 set, it belongs with SSE/AVX, however we test it here
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# too, it should have its default value in both cases.
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foreach {regname regvalue} { "fctrl" "0x37f" \
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"fstat" "0x0" \
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"ftag" "0xffff" \
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"fiseg" "0x0" \
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"fioff" "0x0" \
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"foseg" "0x0" \
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"fooff" "0x0" \
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"fop" "0x0" \
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"mxcsr" "0x1f80"} {
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gdb_test "p/x \$${regname}" " = ${regvalue}" "check initial value of \$${regname}"
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}
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# No x87 instructions have been executed yet. Step up to FWAIT
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# instruction. Executing this instruction will enable the x87 unit,
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# causing the kernel to place the default values into all registers.
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# After this GDB will no longer supply the default values itself but
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# will instread read the values out of the xsave buffer.
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gdb_test "stepi" "fwait" "step to FWAIT instruction"
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gdb_test "stepi" "nop" "step past FWAIT instruction"
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# The x87 unit is now enabled, but the register values should be
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# unchanged.
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foreach {regname regvalue} { "fctrl" "0x37f" \
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"fstat" "0x0" \
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"ftag" "0xffff" \
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"fiseg" "0x0" \
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"fioff" "0x0" \
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"foseg" "0x0" \
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"fooff" "0x0" \
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"fop" "0x0" \
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"mxcsr" "0x1f80"} {
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gdb_test "p/x \$${regname}" " = ${regvalue}" "check post FWAIT value of \$${regname}"
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}
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# Now step to an x87 instruction that modifies some state.
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gdb_test "stepi" "fld1" "step to FLD1 instruction"
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# Grab the address of this instruction, it will appear in later
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# results.
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set addr [get_hexadecimal_valueof "\$pc" "0"]
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# Step past the FLD1 instruction.
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gdb_test "stepi" "nop" "step past FLD1 instruction"
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# Check new values of x87 control registers (and MXCSR).
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foreach {regname regvalue} [list "fctrl" "0x37f" \
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"fstat" "0x3800" \
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"ftag" "0x3fff" \
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"fiseg" "0x0" \
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"fioff" "($addr|0x0)" \
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"foseg" "0x0" \
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"fooff" "0x0" \
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"fop" "0x0" \
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"mxcsr" "0x1f80" ] {
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gdb_test "p/x \$${regname}" " = ${regvalue}" "check post FLD1 value of \$${regname}"
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}
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}
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# Start the test file, all FP features will be disabled. Set a new
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# value into the MXCSR register, then step forward one instruction (a
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# nop that does not enable any FP features). Finally check that the
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# mxcsr register still has the value we set.
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proc_with_prefix check_setting_mxcsr_before_enable {} {
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global binfile gdb_prompt
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clean_restart ${binfile}
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if {![runto_main]} {
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return 0
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}
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gdb_test_no_output "set \$mxcsr=0x9f80" "set a new value for MXCSR"
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gdb_test "stepi" "fwait" "step forward one instruction for mxcsr test"
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set test "check new value of MXCSR is still in place"
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set pass_pattern " = 0x9f80"
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# Pre-4.14 kernels have a bug (fixed by commit 0852b374173b "x86/fpu:
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# Add FPU state copying quirk to handle XRSTOR failure on Intel Skylake
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# CPUs") that causes mxcsr not to be copied, in which case we get 0 instead of
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# the just saved value.
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set xfail_pattern " = 0x0"
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gdb_test_multiple "p/x \$mxcsr" $test {
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-re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
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pass $test
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}
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-re "\[\r\n\]*(?:$xfail_pattern)\[\r\n\]+$gdb_prompt $" {
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xfail $test
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}
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}
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}
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# Start the test file, all FP features will be disabled. Set new
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# values into the x87 control-registers, then step forward one
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# instruction (a nop that does not enable any FP features). Finally
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# check that all the x87 control-registers still have the values we
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# set.
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proc_with_prefix check_setting_x87_regs_before_enable {} {
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global binfile
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clean_restart ${binfile}
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if {![runto_main]} {
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return 0
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}
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foreach {regname regvalue} [list "fctrl" "0x37f" \
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"fstat" "0x3800" \
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"ftag" "0x7777" \
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"fiseg" "0x12" \
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"fioff" "0x2418" \
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"foseg" "0x24" \
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"fooff" "0x36" \
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"fop" "0x100" ] {
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gdb_test_no_output "set \$$regname=$regvalue" "set a new value for $regname"
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}
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gdb_test "stepi" "fwait" "step forward one instruction for x87 test"
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foreach {regname regvalue} [list "fctrl" "0x37f" \
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"fstat" "0x3800" \
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"ftag" "0x7777" \
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"fiseg" "0x12" \
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"fioff" "0x2418" \
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"foseg" "0x24" \
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"fooff" "0x36" \
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"fop" "0x100" ] {
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gdb_test "p/x \$$regname" "= $regvalue" "check new value of $regname"
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}
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}
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check_x87_regs_around_init
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check_setting_mxcsr_before_enable
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check_setting_x87_regs_before_enable
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