1 # Copyright 2020-2024 Free Software Foundation, Inc.
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.
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.
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/>.
16 # Test stepping over an exec syscall instruction in a multi-threaded program.
18 standard_testfile .c -execd.c
20 set syscalls_src $srcdir/lib/my-syscalls.S
22 # EXECR_THREAD is "leader" or "other", and decides which thread does the exec.
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
31 # DISPLACED_STEPPING is "auto" or "off" and controls the value of "set
32 # displaced-stepping".
34 proc do_test { execr_thread different_text_segments displaced_stepping } {
35 global srcdir subdir srcfile srcfile2 binfile
39 set execr_srcs [list $srcdir/$subdir/$srcfile $syscalls_src]
40 set execd_srcs [list $srcdir/$subdir/$srcfile2]
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
46 set execr_opts [list debug]
47 set execd_opts [list debug]
49 lappend_include_file execr_opts $::srcdir/lib/my-syscalls.h
51 if { $different_text_segments } {
52 lappend execr_opts "text_segment=0x600000"
53 lappend execd_opts "text_segment=0x800000"
56 if { $execr_thread == "leader" } {
57 lappend execr_opts "additional_flags=-DLEADER_DOES_EXEC"
58 } elseif { $execr_thread == "other" } {
59 lappend execr_opts "additional_flags=-DOTHER_DOES_EXEC"
61 error "Invalid execr_thread value: $execr_thread."
64 # Compile execr binary (the one that does the exec).
65 if {[gdb_compile_pthreads $execr_srcs $execr_binfile executable $execr_opts] != "" } {
69 # Compile the second binary (the one that gets exec'd).
70 if {[gdb_compile $execd_srcs $execd_binfile executable $execd_opts] != "" } {
74 clean_restart ${execr_binfile}
76 gdb_test_no_output "set displaced-stepping $displaced_stepping"
82 # Leave breakpoint main inserted, we expect to hit it after exec.
84 # This breakpoint will be stepped by whatever thread does the exec.
85 gdb_test "break my_execve_syscall if 0" "Breakpoint $decimal at $hex.*"
87 # Continue across exec to main.
88 if { [target_is_gdbserver] } {
89 setup_kfail gdb/27020 "*-*-*"
91 set failed [gdb_test "continue" \
92 "process $decimal is executing new program: .* hit Breakpoint $decimal, main .*" \
93 "continue across exec"]
98 # Just to confirm we are indeed in the execd program.
99 gdb_test "print a_variable_in_execd" " = 1212"
101 # Continue execution to make sure we can step over the breakpoint on main.
102 # It would be nice to use gdb_continue_to_end to ensure the program can
103 # exit properly, but it hangs due to PR gdb/26995.
105 gdb_test "continue" "Breakpoint $decimal, foo .*" \
109 foreach_with_prefix displaced_stepping {auto off} {
110 foreach_with_prefix different_text_segments {true false} {
111 foreach_with_prefix execr_thread {leader other} {
112 do_test $execr_thread $different_text_segments $displaced_stepping