| # Copyright (C) 2018-2021 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. |
| |
| if {![istarget "powerpc*-*-linux*"]} then { |
| verbose "Skipping PowerPC test for the TAR register." |
| return |
| } |
| |
| 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.*" |