gdb/testsuite/gdb.arch/i386-prologue-skip-cf-protection.exp

# Copyright 2020-2021 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 skipping a prologue that was generated with gcc's -fcf-protection=full
# (control flow protection) option.
#
# This option places an `endbr32`/`endbr64` instruction at the start of
# all functions, which can interfere with prologue analysis.

standard_testfile .c
set binfile ${binfile}

if { ![istarget x86_64-*-*] && ![istarget i?86-*-*] } {
    verbose "Skipping ${testfile}."
    return
}

if { ![supports_fcf_protection] } {
    untested "-fcf-protection not supported"
    return
}

set opts {debug additional_flags=-fcf-protection=full}

if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $opts] != "" } {
    untested "failed to compile"
    return
}

clean_restart ${binfile}

# Get start address of function main.
set main_addr [get_integer_valueof &main -1]
gdb_assert {$main_addr != -1}

set bp_addr -1

# Put breakpoint on main, get the address where the breakpoint was installed.
gdb_test_multiple "break -q main" "break on main, get address" {
    -re -wrap "Breakpoint $decimal at ($hex).*" {
	set bp_addr $expect_out(1,string)

	# Convert to decimal.
	set bp_addr [expr $bp_addr]

	pass $gdb_test_name
    }
}

if { $bp_addr != -1 } {
    # Make sure some prologue was skipped.
    gdb_assert {$bp_addr > $main_addr}
}