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# Copyright 2017-2023 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/>.
# Test the symbol needs check mechanism if it assumes that faking
# reads from a target is a safe thing to do.
#
# In particular, the test uses a relative branch DWARF operation to
# hide a register read. If the target reads are indeed faked, the
# result returned will be wrong.
load_lib dwarf.exp
# This test can only be run on targets which support DWARF-2 and use gas.
if {![dwarf2_support]} {
return 0
}
# Choose suitable integer registers for the test.
set dwarf_regnum 0
if { [is_aarch64_target] } {
set regname x0
} elseif { [is_aarch32_target]
|| [istarget "s390*-*-*" ]
|| [istarget "powerpc*-*-*"]
|| [istarget "rs6000*-*-aix*"] } {
set regname r0
} elseif { [is_x86_like_target] } {
set regname eax
} elseif { [is_amd64_regs_target] } {
set regname rax
} else {
verbose "Skipping ${gdb_test_file_name}."
return
}
standard_testfile symbol_needs_eval.c ${gdb_test_file_name}-dw.S
# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global dwarf_regnum regname
set exec_mask_var [gdb_target_symbol exec_mask]
cu {} {
DW_TAG_compile_unit {
{DW_AT_name symbol_needs_eval.c}
{DW_AT_comp_dir /tmp}
} {
declare_labels int_type_label
# define int type
int_type_label: DW_TAG_base_type {
{DW_AT_name "int"}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_byte_size 4 DW_FORM_sdata}
}
# define artificial variable a
DW_TAG_variable {
{DW_AT_name a}
{DW_AT_type :$int_type_label}
{DW_AT_location {
DW_OP_addr $exec_mask_var
DW_OP_deref
# conditional jump to DW_OP_bregx
DW_OP_bra 4
DW_OP_lit0
# jump to DW_OP_stack_value
DW_OP_skip 3
DW_OP_bregx $dwarf_regnum 0
DW_OP_stack_value
} SPECIAL_expr}
{external 1 flag}
}
}
}
}
if { [prepare_for_testing ${testfile}.exp ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
# The variable's location expression requires a frame,
# so an error should be reported.
gdb_test "print/d a" "No frame selected." "variable a can't be printed"
if ![runto_main] {
return -1
}
gdb_test_no_output "set var \$$regname = 2" "init reg to 2"
gdb_test "print/d a" " = 2" "a == 2"
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