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# Copyright (C) 2018-2024 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/>.
# This file is part of the gdb testsuite.
# Test access to special purpose register TAR (the Target Address
# Register). The test inferior writes to this register, we check that
# GDB reads the same value, then write to the register the address of
# another label. We then let the inferior continue and execute a
# branch to TAR and check that we stop at the address that we wrote to
# register.
require {istarget "powerpc*-*-linux*"}
standard_testfile .c
if {[build_executable "compile" $binfile $srcfile {debug}] == -1} {
return -1
}
proc check_register_access { regname } {
global gdb_prompt
set test "$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
}
proc tar_available {} {
global gdb_prompt
global inferior_exited_re
set test "TAR 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
}
# Do one pass to check if TAR is usable, system
# software can prevent it from being used.
with_test_prefix "check TAR access" {
clean_restart $binfile
if ![runto_main] {
return
}
if {![check_register_access "tar"]} {
return
}
if {![tar_available]} {
return
}
}
# Now do the actual test
clean_restart $binfile
if ![runto_main] {
return
}
gdb_breakpoint [gdb_get_line_number "marker"]
gdb_continue_to_breakpoint "continue to marker"
set target1 [get_hexadecimal_valueof "target1" -1]
set tar [get_hexadecimal_valueof "\$tar" -2]
set test "TAR value from mtspr"
if {${target1} == ${tar}} {
pass $test
} else {
fail $test
}
set target2 [get_hexadecimal_valueof "target2" -1]
if {$target2 == -1} {
fail "Could not get value of target2"
return
}
gdb_test_no_output "set \$tar = $target2" "set tar"
gdb_breakpoint [gdb_get_line_number "marker 2"]
gdb_continue_to_breakpoint "continue to new target address" ".*marker 2.*"
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