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# Copyright 2020-2024 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/>.
# Test to reproduce the crash described in PR 26813.
#
# When reading a list in any table in the .debug_loclists section, GDB would
# read the header at offset 0 in the section (the header of the first table).
# When the index of the list we read was greater than the number of lists of
# the first table, GDB would erroneously report that the index is invalid.
#
# So this test creates a .debug_loclists section with two tables. The second
# table has more lists than the first one and we try to read a high index in
# the second table.
load_lib dwarf.exp
require dwarf2_support
# Test with 32-bit and 64-bit DWARF.
foreach_with_prefix is_64 {false true} {
if { $is_64 } {
standard_testfile .c -dw64.S
set testfile ${testfile}-dw64
} else {
standard_testfile .c -dw32.S
set testfile ${testfile}-dw32
}
# Get the addresses / lengths of func1 and func2.
lassign [function_range func1 $srcdir/$subdir/$srcfile] func1_addr func1_len
lassign [function_range func2 $srcdir/$subdir/$srcfile] func2_addr func2_len
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
global func1_addr func1_len
global func2_addr func2_len
global is_64
# The CU uses the DW_FORM_loclistx form to refer to the .debug_loclists
# section.
cu {
version 5
is_64 $is_64
} {
declare_labels int_type
DW_TAG_compile_unit {
{DW_AT_loclists_base cu_table DW_FORM_sec_offset}
} {
int_type: DW_TAG_base_type {
{DW_AT_byte_size 4 DW_FORM_data1}
{DW_AT_encoding @DW_ATE_signed}
{DW_AT_name "int"}
}
DW_TAG_variable {
{DW_AT_name "foo"}
{DW_AT_location 1 DW_FORM_loclistx}
{DW_AT_type :$int_type}
}
DW_TAG_subprogram {
{DW_AT_name "func1"}
{DW_AT_low_pc $func1_addr}
{DW_AT_high_pc $func1_len DW_FORM_udata}
}
DW_TAG_subprogram {
{DW_AT_name "func2"}
{DW_AT_low_pc $func2_addr}
{DW_AT_high_pc $func2_len DW_FORM_udata}
}
}
}
loclists {is-64 $is_64} {
# This table is unused, but exists so that the used table is not at
# the beginning of the section.
table {} {
list_ {
start_length 0x1000 0x1000 { DW_OP_addr 0x100000 }
}
}
# The lists in this table are accessed by index (DW_FORM_rnglistx).
table {post-header-label cu_table} {
# This list is unused, but exists to offset the next ones.
list_ {
start_length 0x1000 0x1000 { DW_OP_addr 0x100000 }
}
# For variable foo.
list_ {
# This should not affect the following addresses.
base_address 0xffff
# When in func1.
start_length $func1_addr $func1_len {
DW_OP_constu 0x123456
DW_OP_stack_value
}
# When in func2.
start_length $func2_addr $func2_len {
DW_OP_constu 0x234567
DW_OP_stack_value
}
}
}
}
}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if { ![runto_main] } {
return
}
gdb_breakpoint "func1"
gdb_breakpoint "func2"
gdb_continue_to_breakpoint "func1"
with_test_prefix "at func1" {
gdb_test "print /x foo" " = 0x123456"
}
gdb_continue_to_breakpoint "func2"
with_test_prefix "at func2" {
gdb_test "print /x foo" " = 0x234567"
}
}
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