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

# Copyright 2018-2025 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 in the same vein as amd64-pseudo-unwind, making sure we can
# read write pseudo registers in outer frames.  However, it tests a special
# case where the debug info includes unwind information for a pseudo register
# but not the underlying raw register.  This can happen for the pseudo register
# s16, which is the bottom half of the raw register d8.
#
# See "DWARF for the ARM architecture":
#   https://github.com/ARM-software/abi-aa/releases/download/2023Q3/aadwarf32.pdf

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

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

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

clean_restart $testfile

if {![runto_main]} {
    return
}

gdb_breakpoint break_here_asm temporary
gdb_continue_to_breakpoint "continue to callee"

# Verify the value of s16 in the inner frame (callee).
with_test_prefix "callee, before change" {
    gdb_test "p/x \$s16" " = 0x20212223"
}

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

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

# Go up one frame, and do the same.
gdb_test "up"

# Verify the value of s16 in the outer frame (caller).
with_test_prefix "caller, before change" {
    gdb_test "p/x \$s16" " = 0x10111213"
}

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

# Verify the value of s16 in the outer frame (caller) after the change.
with_test_prefix "caller, after change" {
    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 \$s16" " = 0x3f800000"
}

# Verify that the value of the saved s16 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" " = 0x40000000"