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# Copyright (C) 2018-2023 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/>.
# This file is part of the gdb testsuite.
# Test access to special purpose registers PPR and DSCR. The test
# inferior writes to these registers, we check that GDB reads the same
# values, then write to the registers trough GDB, step once, and check
# again if we read back the same values.
require {istarget "powerpc*-*-linux*"}
standard_testfile .c
if {[build_executable "compile" $binfile $srcfile {debug}] == -1} {
return
}
proc check_register_access { regname } {
global gdb_prompt
set test "$regname register access"
gdb_test_multiple "info reg $regname" "$test" {
-re "Invalid register.*\r\n$gdb_prompt $" {
unsupported "$test"
return 0
}
-re "\r\n$regname.*\r\n$gdb_prompt $" {
pass "$test"
return 1
}
}
return 0
}
# Do one pass to check if the instructions in our test programs are
# available to this processor (e.g. mtspr 3, RS for accessing DSCR).
proc ppr_dscr_available {} {
global gdb_prompt
global inferior_exited_re
set test "PPR/DSCR available to inferior"
gdb_test_multiple "continue" "" {
-re "Illegal instruction.*\r\n$gdb_prompt $" {
unsupported "$test"
return 0
}
-re "$inferior_exited_re normally.*$gdb_prompt $" {
pass "$test"
return 1
}
}
return 0
}
with_test_prefix "check PPR/DSCR access" {
clean_restart $binfile
if ![runto_main] {
return
}
if {![check_register_access "ppr"]} {
return
}
if {![check_register_access "dscr"]} {
return
}
if {![ppr_dscr_available]} {
return
}
}
# Now do the actual test
clean_restart $binfile
if ![runto_main] {
return
}
gdb_breakpoint [gdb_get_line_number "marker"]
gdb_continue_to_breakpoint "continue to marker"
# At the breakpoint the inferior should have set the
# registers to these expected values.
with_test_prefix "before write" {
gdb_test "info reg dscr" "dscr.*0x0*20\[ \t\]+.*"
gdb_test "info reg ppr" "ppr.*0x0*8000000000000\[ \t\]+.*"
}
# Set Store Stream Enable in DSCR and set PPR to the medium-low
# priority.
gdb_test_no_output "set \$dscr = 0x8"
gdb_test_no_output "set \$ppr = 0xC000000000000"
gdb_test "stepi" "asm.*"
with_test_prefix "after write" {
gdb_test "info reg dscr" "dscr.*0x0*8+\[ \t\]+.*"
gdb_test "info reg ppr" "ppr.*0x0*\[cC\]000000000000\[ \t\]+.*"
}
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