gdb/testsuite/gdb.arch/arm-pseudo-unwind.exp

# Copyright 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 test is equivalent to amd64-pseudo-unwind, but specific to ARM.  We
# use the raw register d8 which is 64 bits long.  We use pseudo register s16,
# which is the low 32 bits of d8.

if { ![istarget arm*-*-* ] } {
    verbose "Skipping arm pseudo register unwind."
    return
}

standard_testfile arm-pseudo-unwind.c arm-pseudo-unwind-asm.S

if { [prepare_for_testing "failed to prepare" ${testfile} \
	"${srcfile} ${srcfile2}" {debug additional_flags=-marm}] } {
    return -1
}

clean_restart ${binfile}

if ![runto_main] then {
    fail "could not run to main"
}

gdb_breakpoint break_here_asm temporary
gdb_continue_to_breakpoint "continue to callee"

# Verify the value of d8/s16 in the inner frame (callee).
with_test_prefix "callee, before change" {
    gdb_test "p/x \$d8" " = 0x2021222324252627"
    gdb_test "p/x \$s16" " = 0x24252627"
}

# Verify that we can change the value of the pseudo register (s16) in the inner
# frame (callee).
gdb_test_no_output "set \$s16 = 1.0"

# Verify the value of d8/s16 in the inner frame (callee) after the change.
with_test_prefix "callee, after change" {
    gdb_test "p/x \$d8" " = 0x202122233f800000"
    gdb_test "p/x \$s16" " = 0x3f800000"
}

# Go up one frame (to caller), and do the same.
gdb_test "up"

# Verify the value of d8/s16 in the outer frame (caller).
with_test_prefix "caller, before change" {
    gdb_test "p/x \$d8" " = 0x1011121314151617"
    gdb_test "p/x \$s16" " = 0x14151617"
}

# Verify that we can change the value of the pseudo register (s16) in the outer
# frame (caller).
gdb_test_no_output "set \$s16 = 2.0"

# Verify the value of d8/s16 in the outer frame (caller) after the change.
with_test_prefix "caller, after change" {
    gdb_test "p/x \$d8" " = 0x1011121340000000"
    gdb_test "p/x \$s16" " = 0x40000000"
}

# Go back to frame 0 (callee), check that the change to the outer frame didn't
# mess up anything there.
gdb_test "down"
with_test_prefix "callee, after change in caller" {
    gdb_test "p/x \$d8" " = 0x202122233f800000"
    gdb_test "p/x \$s16" " = 0x3f800000"
}

# Verify that the value of the saved d8 we changed is correctly seen by the
# inferior.
gdb_breakpoint break_here_c temporary
gdb_continue_to_breakpoint "continue to break_here_c"
gdb_test "p/x value" " = 0x1011121340000000"