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88b9d363 | 1 | # Copyright 2020-2022 Free Software Foundation, Inc. |
3b7a962d SM |
2 | |
3 | # This program is free software; you can redistribute it and/or modify | |
4 | # it under the terms of the GNU General Public License as published by | |
5 | # the Free Software Foundation; either version 3 of the License, or | |
6 | # (at your option) any later version. | |
7 | # | |
8 | # This program is distributed in the hope that it will be useful, | |
9 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | # GNU General Public License for more details. | |
12 | # | |
13 | # You should have received a copy of the GNU General Public License | |
14 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | # Test stepping over an exec syscall instruction in a multi-threaded program. | |
17 | ||
18 | standard_testfile .c -execd.c | |
19 | ||
20 | set syscalls_src $srcdir/lib/my-syscalls.S | |
21 | ||
22 | # EXECR_THREAD is "leader" or "other", and decides which thread does the exec. | |
23 | # | |
24 | # If DIFFERENT_TEXT_SEGMENTS is true, the exec'er and exec'd program are | |
25 | # compiled with different, explicit text segment addresses. This makes it so | |
26 | # the address of the displaced stepping buffer in the old executable is likely | |
27 | # not accessible in the new executable. This might catch cases where GDB tries | |
28 | # (wrongfully) to restore the bytes saved from the old executable in the new | |
29 | # executable. | |
30 | # | |
31 | # DISPLACED_STEPPING is "auto" or "off" and controls the value of "set | |
32 | # displaced-stepping". | |
33 | ||
34 | proc do_test { execr_thread different_text_segments displaced_stepping } { | |
35 | global srcdir subdir srcfile srcfile2 binfile | |
36 | global syscalls_src | |
37 | global decimal hex | |
38 | ||
39 | set execr_srcs [list $srcdir/$subdir/$srcfile $syscalls_src] | |
40 | set execd_srcs [list $srcdir/$subdir/$srcfile2] | |
41 | ||
42 | # Generate unique filenames for each case. | |
43 | set execr_binfile $binfile-execr-thread-$execr_thread-diff-text-segs-$different_text_segments | |
44 | set execd_binfile $execr_binfile-execd | |
45 | ||
46 | set execr_opts [list debug] | |
47 | set execd_opts [list debug] | |
48 | ||
49 | if { $different_text_segments } { | |
50 | lappend execr_opts "ldflags=-Wl,-Ttext-segment=0x600000" | |
51 | lappend execd_opts "ldflags=-Wl,-Ttext-segment=0x800000" | |
52 | } | |
53 | ||
54 | if { $execr_thread == "leader" } { | |
55 | lappend execr_opts "additional_flags=-DLEADER_DOES_EXEC" | |
56 | } elseif { $execr_thread == "other" } { | |
57 | lappend execr_opts "additional_flags=-DOTHER_DOES_EXEC" | |
58 | } else { | |
59 | error "Invalid execr_thread value: $execr_thread." | |
60 | } | |
61 | ||
62 | # Compile execr binary (the one that does the exec). | |
63 | if {[gdb_compile_pthreads $execr_srcs $execr_binfile executable $execr_opts] != "" } { | |
64 | return -1 | |
65 | } | |
66 | ||
67 | # Compile the second binary (the one that gets exec'd). | |
68 | if {[gdb_compile $execd_srcs $execd_binfile executable $execd_opts] != "" } { | |
69 | return -1 | |
70 | } | |
71 | ||
72 | clean_restart ${execr_binfile} | |
73 | ||
74 | gdb_test_no_output "set displaced-stepping $displaced_stepping" | |
75 | ||
76 | if ![runto_main] { | |
77 | return | |
78 | } | |
79 | ||
80 | # Leave breakpoint main inserted, we expect to hit it after exec. | |
81 | ||
82 | # This breakpoint will be stepped by whatever thread does the exec. | |
83 | gdb_test "break my_execve_syscall if 0" "Breakpoint $decimal at $hex.*" | |
84 | ||
85 | # Continue across exec to main. | |
86 | if { [target_is_gdbserver] } { | |
87 | setup_kfail gdb/27020 "*-*-*" | |
88 | } | |
89 | set failed [gdb_test "continue" \ | |
90 | "process $decimal is executing new program: .* hit Breakpoint $decimal, main .*" \ | |
91 | "continue across exec"] | |
92 | if { $failed } { | |
93 | return | |
94 | } | |
95 | ||
96 | # Just to confirm we are indeed in the execd program. | |
97 | gdb_test "print a_variable_in_execd" " = 1212" | |
98 | ||
99 | # Continue execution to make sure we can step over the breakpoint on main. | |
100 | # It would be nice to use gdb_continue_to_end to ensure the program can | |
101 | # exit properly, but it hangs due to PR gdb/26995. | |
102 | gdb_breakpoint foo | |
103 | gdb_test "continue" "Breakpoint $decimal, foo .*" \ | |
104 | "continue to foo" | |
105 | } | |
106 | ||
107 | foreach_with_prefix displaced_stepping {auto off} { | |
108 | foreach_with_prefix different_text_segments {true false} { | |
109 | foreach_with_prefix execr_thread {leader other} { | |
110 | do_test $execr_thread $different_text_segments $displaced_stepping | |
111 | } | |
112 | } | |
113 | } |