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3666a04883
This commits the result of running gdb/copyright.py as per our Start
of New Year procedure...
gdb/ChangeLog
Update copyright year range in copyright header of all GDB files.
114 lines
4.0 KiB
Plaintext
114 lines
4.0 KiB
Plaintext
# Copyright 2020-2021 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test stepping over an exec syscall instruction in a multi-threaded program.
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standard_testfile .c -execd.c
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set syscalls_src $srcdir/lib/my-syscalls.S
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# EXECR_THREAD is "leader" or "other", and decides which thread does the exec.
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#
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# If DIFFERENT_TEXT_SEGMENTS is true, the exec'er and exec'd program are
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# compiled with different, explicit text segment addresses. This makes it so
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# the address of the displaced stepping buffer in the old executable is likely
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# not accessible in the new executable. This might catch cases where GDB tries
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# (wrongfully) to restore the bytes saved from the old executable in the new
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# executable.
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#
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# DISPLACED_STEPPING is "auto" or "off" and controls the value of "set
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# displaced-stepping".
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proc do_test { execr_thread different_text_segments displaced_stepping } {
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global srcdir subdir srcfile srcfile2 binfile
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global syscalls_src
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global decimal hex
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set execr_srcs [list $srcdir/$subdir/$srcfile $syscalls_src]
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set execd_srcs [list $srcdir/$subdir/$srcfile2]
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# Generate unique filenames for each case.
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set execr_binfile $binfile-execr-thread-$execr_thread-diff-text-segs-$different_text_segments
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set execd_binfile $execr_binfile-execd
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set execr_opts [list debug]
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set execd_opts [list debug]
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if { $different_text_segments } {
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lappend execr_opts "ldflags=-Wl,-Ttext-segment=0x600000"
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lappend execd_opts "ldflags=-Wl,-Ttext-segment=0x800000"
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}
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if { $execr_thread == "leader" } {
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lappend execr_opts "additional_flags=-DLEADER_DOES_EXEC"
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} elseif { $execr_thread == "other" } {
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lappend execr_opts "additional_flags=-DOTHER_DOES_EXEC"
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} else {
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error "Invalid execr_thread value: $execr_thread."
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}
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# Compile execr binary (the one that does the exec).
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if {[gdb_compile_pthreads $execr_srcs $execr_binfile executable $execr_opts] != "" } {
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return -1
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}
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# Compile the second binary (the one that gets exec'd).
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if {[gdb_compile $execd_srcs $execd_binfile executable $execd_opts] != "" } {
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return -1
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}
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clean_restart ${execr_binfile}
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gdb_test_no_output "set displaced-stepping $displaced_stepping"
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if ![runto_main] {
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return
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}
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# Leave breakpoint main inserted, we expect to hit it after exec.
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# This breakpoint will be stepped by whatever thread does the exec.
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gdb_test "break my_execve_syscall if 0" "Breakpoint $decimal at $hex.*"
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# Continue across exec to main.
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if { [target_is_gdbserver] } {
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setup_kfail gdb/27020 "*-*-*"
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}
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set failed [gdb_test "continue" \
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"process $decimal is executing new program: .* hit Breakpoint $decimal, main .*" \
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"continue across exec"]
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if { $failed } {
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return
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}
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# Just to confirm we are indeed in the execd program.
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gdb_test "print a_variable_in_execd" " = 1212"
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# Continue execution to make sure we can step over the breakpoint on main.
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# It would be nice to use gdb_continue_to_end to ensure the program can
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# exit properly, but it hangs due to PR gdb/26995.
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gdb_breakpoint foo
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gdb_test "continue" "Breakpoint $decimal, foo .*" \
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"continue to foo"
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}
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foreach_with_prefix displaced_stepping {auto off} {
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foreach_with_prefix different_text_segments {true false} {
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foreach_with_prefix execr_thread {leader other} {
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do_test $execr_thread $different_text_segments $displaced_stepping
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}
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}
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}
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