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# Copyright 2022-2023 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/>.
# Test a binary that uses SVE and exercise changing the SVE vector length.
require !skip_aarch64_sve_tests
standard_testfile
if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] } {
return
}
set linespec ${srcfile}:[gdb_get_line_number "break here"]
if ![runto ${linespec}] {
return
}
# Count number of lines in "info registers" output.
proc count_info_registers {} {
global gdb_prompt
set ret 0
gdb_test_multiple "info all-registers" "" {
-re ".*$gdb_prompt $" {
set ret [count_newlines $expect_out(buffer)]
}
}
return ${ret}
}
proc get_register_value {register} {
global gdb_prompt
set ret ""
gdb_test_multiple "print \$${register}" "" {
-re ". = \[0-9\]+\r\n$gdb_prompt $" {
regexp {. = ([0-9]+)} $expect_out(buffer) matched ret
}
-re ".*$gdb_prompt $" {
}
}
return ${ret}
}
# The test executable halves the vector length in a loop, so loop along
# to check it.
for {set i [get_register_value "vg"]} {$i > 1} {set i [expr $i / 2]} {
set lines_before [count_info_registers]
gdb_test "next" ".*if .res < 0." "step over prctl vg = ${i}"
set lines_after [count_info_registers]
# There was a bug where GDB would lose track of some registers when the
# vector length changed. Make sure they're still all there.
if {${lines_before} == ${lines_after}} {
pass "same number of registers vg = ${i}"
} else {
fail "same number of registers vg = ${i}"
}
gdb_test "print \$vg" ". = ${i}" "vg was changed to ${i}"
set size_after [expr {$i * 8}]
for {set j 0} {$j < 32} {set j [incr j]} {
gdb_test "print sizeof(\$z$j)" ". = ${size_after}" "z$j has ${size_after} bytes"
}
gdb_test_multiple "continue" "" {
-re ".*Breakpoint $decimal, do_sve_ioctl_test .*$gdb_prompt $" {
# Next iteration.
}
-re "Inferior 1 .* exited normally.*$gdb_prompt $" {
# We're done.
break
}
-re "$gdb_prompt $" {
fail "unexpected output"
break;
}
}
}
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