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- # Copyright 2020-2022 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/>.
- # Test stepping over an exec syscall instruction in a multi-threaded program.
- standard_testfile .c -execd.c
- set syscalls_src $srcdir/lib/my-syscalls.S
- # EXECR_THREAD is "leader" or "other", and decides which thread does the exec.
- #
- # If DIFFERENT_TEXT_SEGMENTS is true, the exec'er and exec'd program are
- # compiled with different, explicit text segment addresses. This makes it so
- # the address of the displaced stepping buffer in the old executable is likely
- # not accessible in the new executable. This might catch cases where GDB tries
- # (wrongfully) to restore the bytes saved from the old executable in the new
- # executable.
- #
- # DISPLACED_STEPPING is "auto" or "off" and controls the value of "set
- # displaced-stepping".
- proc do_test { execr_thread different_text_segments displaced_stepping } {
- global srcdir subdir srcfile srcfile2 binfile
- global syscalls_src
- global decimal hex
- set execr_srcs [list $srcdir/$subdir/$srcfile $syscalls_src]
- set execd_srcs [list $srcdir/$subdir/$srcfile2]
- # Generate unique filenames for each case.
- set execr_binfile $binfile-execr-thread-$execr_thread-diff-text-segs-$different_text_segments
- set execd_binfile $execr_binfile-execd
- set execr_opts [list debug]
- set execd_opts [list debug]
- if { $different_text_segments } {
- lappend execr_opts "ldflags=-Wl,-Ttext-segment=0x600000"
- lappend execd_opts "ldflags=-Wl,-Ttext-segment=0x800000"
- }
- if { $execr_thread == "leader" } {
- lappend execr_opts "additional_flags=-DLEADER_DOES_EXEC"
- } elseif { $execr_thread == "other" } {
- lappend execr_opts "additional_flags=-DOTHER_DOES_EXEC"
- } else {
- error "Invalid execr_thread value: $execr_thread."
- }
- # Compile execr binary (the one that does the exec).
- if {[gdb_compile_pthreads $execr_srcs $execr_binfile executable $execr_opts] != "" } {
- return -1
- }
- # Compile the second binary (the one that gets exec'd).
- if {[gdb_compile $execd_srcs $execd_binfile executable $execd_opts] != "" } {
- return -1
- }
- clean_restart ${execr_binfile}
- gdb_test_no_output "set displaced-stepping $displaced_stepping"
- if ![runto_main] {
- return
- }
- # Leave breakpoint main inserted, we expect to hit it after exec.
- # This breakpoint will be stepped by whatever thread does the exec.
- gdb_test "break my_execve_syscall if 0" "Breakpoint $decimal at $hex.*"
- # Continue across exec to main.
- if { [target_is_gdbserver] } {
- setup_kfail gdb/27020 "*-*-*"
- }
- set failed [gdb_test "continue" \
- "process $decimal is executing new program: .* hit Breakpoint $decimal, main .*" \
- "continue across exec"]
- if { $failed } {
- return
- }
- # Just to confirm we are indeed in the execd program.
- gdb_test "print a_variable_in_execd" " = 1212"
- # Continue execution to make sure we can step over the breakpoint on main.
- # It would be nice to use gdb_continue_to_end to ensure the program can
- # exit properly, but it hangs due to PR gdb/26995.
- gdb_breakpoint foo
- gdb_test "continue" "Breakpoint $decimal, foo .*" \
- "continue to foo"
- }
- foreach_with_prefix displaced_stepping {auto off} {
- foreach_with_prefix different_text_segments {true false} {
- foreach_with_prefix execr_thread {leader other} {
- do_test $execr_thread $different_text_segments $displaced_stepping
- }
- }
- }
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