# 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/>.

# This file is part of the gdb testsuite.

# Test explicitly unwinding the PC DWARF register on aarch64

if {![is_aarch64_target]} {
    verbose "Skipping ${gdb_test_file_name}."
    return
}

standard_testfile .S

if { [prepare_for_testing "failed to prepare" $testfile $srcfile] } {
    return -1
}

if ![runto_main] {
    return -1
}

proc test_reg_vals {} {
    gdb_test "p \$pc - &main" "= 8" "p \$pc"
    gdb_test "p/x \$x30" "= 0x1234" "p \$x30"
}

proc test_unwind_pc { inst } {
    gdb_test "si" "$inst" "single step"
    gdb_test "backtrace" \
	".*#1.*in main ().*" \
	"backtrace"
    gdb_test "up" "in main ().*" "parent frame"
    test_reg_vals
}

# Ready to enter the function
gdb_test "si" "bl test_func" "call site"
# Step through the 3 instructions in the function to make sure that
# we have the same unwind info throughout.
with_test_prefix "1st stepi" {
    test_unwind_pc "mov     x0, x30"
}
with_test_prefix "2nd stepi" {
    test_unwind_pc "mov     x30, 0x1234"
}
with_test_prefix "3rd stepi" {
    test_unwind_pc "ret     x0"
}
# Check again after we returned
with_test_prefix "final" {
    # Check that we've stepped out (si prints out the new function name)
    gdb_test "si" ".*main *().*" "single step out"
    gdb_test "backtrace" \
	"#0\[\t \]+main ().*" \
	"backtrace"
    test_reg_vals
}