gdb/testsuite/gdb.base/vdso-warning.exp

# Copyright 2012-2025 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/>.

# Test that on Linux, we don't warn about not finding the vDSO.  E.g.:
#
#   warning: Could not load shared library symbols for linux-vdso.so.1.

standard_testfile

if { [prepare_for_testing "failed to prepare" ${testfile} $srcfile] } {
    return -1
}

with_test_prefix "setup" {
    gdb_breakpoint "main"

    # At least some versions of Fedora/RHEL glibc have local patches that
    # hide the vDSO.  This lines re-exposes it.  See PR libc/13097,
    # comment 2.  There's no support for passing environment variables in
    # the remote protocol, but that's OK -- if we're testing against a
    # glibc that doesn't list the vDSO without this, the test should still
    # pass.
    gdb_test_no_output "set environment LD_DEBUG=unused"
}

proc test_no_vdso {command} {
    global srcfile
    global gdb_prompt

    set message "startup"
    gdb_test_multiple "$command" $message {
	-re "Could not load shared library symbols .*\r\n$gdb_prompt $" {
	    fail $message
	}
	-re "main \\(\\) at .*$srcfile.*\r\n$gdb_prompt $" {
	    pass $message
	}
    }

    # Extra testing in case the warning changes and we miss updating
    # the above.
    set test "no vdso without symbols is listed"
    gdb_test_multiple "info shared" $test {
	-re "No\[^\r\n\]+linux-(vdso|gate).*$gdb_prompt $" {
	    fail $test
	}
	-re "$gdb_prompt $" {
	    pass $test
	}
    }
}

# First, try a live process.
with_test_prefix "run" {
    gdb_run_cmd
    test_no_vdso ""
}

# Now, dump a core, and reload it.
with_test_prefix "core" {
    set corefile [standard_output_file $testfile.core]
    set core_supported [gdb_gcore_cmd "$corefile" "save a corefile"]
    if {!$core_supported} {
	return -1
    }

    clean_restart ${testfile}

    test_no_vdso "core-file $corefile"
}