1 # This testcase is part of GDB, the GNU debugger.
3 # Copyright 1998-2020 Free Software Foundation, Inc.
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
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10 # This program is distributed in the hope that it will be useful,
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12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
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/>.
18 # Test GDB's ability to restore saved registers from stack frames
19 # when using the `return' command.
21 # This file was written by Jim Blandy <jimb@cygnus.com>, with
22 # fragments borrowed from return.exp.
25 set executable $testfile
27 if { [prepare_for_testing "failed to prepare" $executable $srcfile] } {
31 proc restore_tests { } {
34 if { ! [ runto driver ] } {
40 # For each caller function,
41 # call each of the callee functions,
42 # force a return from the callee, and
43 # make sure that the local variables still have the right values.
45 for {set c 1} {$c <= $limit} {incr c} {
47 # Set a breakpoint at the next caller function.
48 gdb_test "tbreak caller$c" "Temporary breakpoint.*\[0-9\]*\\."
50 # Continue to the next caller function.
51 gdb_test "continue" " caller$c prologue .*" "run to caller$c"
53 # Do each callee function.
54 for {set e 1} {$e <= $limit} {incr e} {
56 gdb_test "tbreak callee$e" "Temporary breakpoint.*\[0-9\]*\\." \
57 "caller$c calls callee$e; tbreak callee"
59 gdb_test "continue" " callee$e prologue .*/" \
60 "caller$c calls callee$e; continue to callee"
62 # Do a forced return from the callee.
63 set test "caller$c calls callee$e; return callee now"
68 "Make .* return now.*y or n. $" \
71 # Check that the values of the local variables are what
73 for {set var 1} {$var <= $c} {incr var} {
74 set expected [expr 0x7eeb + $var]
75 set test "caller$c calls callee$e; return restored l$var to $expected"
76 set pass_pattern " = $expected"
77 set unsupported_pattern " = <optimized out>"
78 gdb_test_multiple "print l$var" $test {
79 -re "\[\r\n\]*(?:$pass_pattern)\[\r\n\]+$gdb_prompt $" {
82 -re "\[\r\n\]*(?:$unsupported_pattern)\[\r\n\]+$gdb_prompt $" {
90 gdb_continue_to_end "" continue 1
93 set prev_timeout $timeout
96 set timeout $prev_timeout
99 clean_restart $binfile
100 if { ![runto_main] } {
103 gdb_test "restore non-existent-file binary" \
104 "Failed to open non-existent-file: .*"