# 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/>.

# This test-case tests the scenario for the crash fixed by commit ee3c5f8968
# "Fix GDB crash when registers cannot be modified":
# $ valgrind /usr/bin/sleep 10000
# ==31595== Memcheck, a memory error detector
# ==31595== Command: /usr/bin/sleep 10000
# ==31595==
# $ gdb /usr/bin/sleep
# (gdb) target remote | vgdb --pid=31595
# Remote debugging using | vgdb --pid=31595
#   ...
# $hex in __GI___nanosleep () at nanosleep.c:27
# 27	  return SYSCALL_CANCEL (nanosleep, requested_time, remaining);
# (gdb) p printf ("bla")
# terminate called after throwing an instance of 'gdb_exception_error'
# Aborted (core dumped)

# Valgrind gdbserver requires gdb with xml support.
require gdb_skip_xml_test 0

load_lib valgrind.exp

if [is_remote target] {
    # The test always runs locally.
    return 0
}

standard_testfile .c
if {[build_executable $testfile.exp $testfile $srcfile {debug}] == -1} {
    return -1
}

set active_at_startup 0
if { [vgdb_start $active_at_startup] == -1 } {
    return -1
}

# Determine whether we're at nanosleep.
gdb_test_multiple "bt 1" "do printf" {
    -re -wrap "nanosleep.*" {
	# If gdb doesn't crash, we get something like:
	# (gdb) p printf ("bla")
	# Could not write register "rdi"; remote failure reply 'E.
	# ERROR changing register rdi regno 5
	# gdb commands changing registers (pc, sp, ...) (e.g. 'jump',
	# set pc, calling from gdb a function in the debugged process, ...)
	# can only be accepted if the thread is VgTs_Runnable or VgTs_Yielding
	# state
	# Thread status is VgTs_WaitSys
	# '
	# (gdb)
	gdb_test "p (int)printf (\"bla\")" \
	    "can only be accepted if the thread is .*" \
	    $gdb_test_name
    }
    -re -wrap "" {
	# For some reason the error condition does not trigger if we're not
	# at nanosleep at the point that we're connecting to vgdb.  See also
	# comment at "exec sleep 1" in vgdb_start.
	unsupported $gdb_test_name
    }
}

vgdb_stop