restore.exp revision 1.8 
1# This testcase is part of GDB, the GNU debugger.
2
3# Copyright 1998-2019 Free Software Foundation, Inc.
4
5# This program is free software; you can redistribute it and/or modify
6# it under the terms of the GNU General Public License as published by
7# the Free Software Foundation; either version 3 of the License, or
8# (at your option) any later version.
9#
10# This program is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13# GNU General Public License for more details.
14#
15# You should have received a copy of the GNU General Public License
16# along with this program.  If not, see <http://www.gnu.org/licenses/>.
17
18# Test GDB's ability to restore saved registers from stack frames
19# when using the `return' command.
20#
21# This file was written by Jim Blandy <jimb@cygnus.com>, with
22# fragments borrowed from return.exp.
23
24standard_testfile
25set executable $testfile
26
27if { [prepare_for_testing "failed to prepare" $executable $srcfile] } {
28    return -1
29}
30
31proc restore_tests { } {
32    global gdb_prompt
33
34    if { ! [ runto driver ] } {
35	return 0
36    }
37
38    set limit 5
39
40    # For each caller function,
41    #   call each of the callee functions,
42    #   force a return from the callee, and
43    #   make sure that the local variables still have the right values.
44
45    for {set c 1} {$c <= $limit} {incr c} {
46
47        # Set a breakpoint at the next caller function.
48        gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\." \
49	    "tbreak caller$c"
50
51	# Continue to the next caller function.
52	gdb_test "continue" " caller$c prologue .*" "run to caller$c"
53
54	# Do each callee function.
55        for {set e 1} {$e <= $limit} {incr e} {
56
57            gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
58		"caller$c calls callee$e; tbreak callee"
59
60  	    gdb_test "continue" " callee$e prologue .*/" \
61		"caller$c calls callee$e; continue to callee"
62
63            # Do a forced return from the callee.
64	    set test "caller$c calls callee$e; return callee now"
65
66	    gdb_test "return 0" \
67		" caller$c .*" \
68		"$test" \
69		"Make .* return now.*y or n. $" \
70		"y"
71
72            # Check that the values of the local variables are what
73	    # they should be.
74            for {set var 1} {$var <= $c} {incr var} {
75                set expected [expr 0x7eeb + $var]
76	        gdb_test "print l$var" " = $expected" \
77		    "caller$c calls callee$e; return restored l$var to $expected"
78            }
79        }
80    }
81
82    gdb_continue_to_end "" continue 1
83}
84
85set prev_timeout $timeout
86set timeout 30
87restore_tests
88set timeout $prev_timeout
89
90# Test PR cli/23785
91clean_restart $binfile
92if { ![runto_main] } {
93    return -1
94}
95gdb_test "restore non-existent-file binary" \
96    "Failed to open non-existent-file: .*"
97