1# Copyright 2018-2023 Free Software Foundation, Inc. 2 3# This program is free software; you can redistribute it and/or modify 4# it under the terms of the GNU General Public License as published by 5# the Free Software Foundation; either version 3 of the License, or 6# (at your option) any later version. 7# 8# This program is distributed in the hope that it will be useful, 9# but WITHOUT ANY WARRANTY; without even the implied warranty of 10# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11# GNU General Public License for more details. 12# 13# You should have received a copy of the GNU General Public License 14# along with this program. If not, see <http://www.gnu.org/licenses/>. 15 16standard_testfile 17 18if { ![istarget "x86*"] } { 19 return 20} 21 22set cflags "-mindirect-branch=thunk -mfunction-return=thunk" 23 24if { [gcc_major_version] >= 8 } { 25 append cflags " -fcf-protection=none" 26} 27if { [prepare_for_testing "failed to prepare" $testfile $srcfile \ 28 [list debug "additional_flags=$cflags"]] } { 29 return -1 30} 31 32if { ![runto_main] } { 33 return -1 34} 35 36# Do repeated instruction steps in order to reach TARGET from CURRENT 37# 38# CURRENT is a string matching the current location 39# TARGET is a string matching the target location 40# TEST is the test name 41# 42# The function issues repeated "stepi" commands as long as the location 43# matches CURRENT up to a maximum of 100 steps. 44# 45# TEST passes if the resulting location matches TARGET and fails 46# otherwise. 47# 48proc stepi_until { current target test } { 49 global gdb_prompt 50 51 set count 0 52 gdb_test_multiple "stepi" "$test" { 53 -re "$current.*$gdb_prompt $" { 54 incr count 55 if { $count < 100 } { 56 send_gdb "stepi\n" 57 exp_continue 58 } else { 59 fail "$test" 60 } 61 } 62 -re "$target.*$gdb_prompt $" { 63 pass "$test" 64 } 65 } 66} 67 68# Normal stepping steps through all thunks. 69gdb_test "step" "thrice\.2.*" "step into thrice" 70gdb_test "next" "thrice\.3.*" "step through thunks and over inc" 71gdb_test "step" "inc\.2.*" "step through call thunk into inc" 72gdb_test "step" "inc\.3.*" "step inside inc" 73gdb_test "step" "thrice\.4.*" "step through return thunk back into thrice" 74 75set alphanum_re "\[a-zA-Z0-9\]" 76set pic_thunk_re "__$alphanum_re*\\.get_pc_thunk\\.$alphanum_re* \\(\\)" 77 78# We can use instruction stepping to step into thunks. 79stepi_until "thrice" "indirect_thunk" "stepi into call thunk" 80stepi_until "indirect_thunk" "inc." "stepi out of call thunk into inc" 81stepi_until "(inc|$pic_thunk_re)" "return_thunk" "stepi into return thunk" 82stepi_until "return_thunk" "thrice" \ 83 "stepi out of return thunk back into thrice" 84