67 lines
2.4 KiB
Text
67 lines
2.4 KiB
Text
|
# Copyright 2021-2022 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/>. */
|
||
|
|
|
||
|
|
# Set a breakpoint on libc's _exit, and verify that it triggers. The function
|
||
|
|
# tends to do a syscall immediately after the prologue, and if the breakpoint is
|
||
|
|
# set past the syscall due to faulty prologue skipping, the breakpoint will not
|
||
|
|
# trigger.
|
||
|
|
#
|
||
|
|
# In particular, we're trying to excercise the instruction analysis
|
||
|
|
# functionality of prologue skipping. If the non-minimal symbols are
|
||
|
|
# read for libc, then that functionality might not be used because f.i.
|
||
|
|
# line-info is used instead. Also, if the minimal symbols are not read
|
||
|
|
# for libc, then the breakpoint is set on the exec-local _exit@plt instead,
|
||
|
|
# and that functionality will also not be used.
|
||
|
|
#
|
||
|
|
# We may get the required setup in case of a libc with misssing separate
|
||
|
|
# debuginfo, but we want the same effect if that debuginfo is installed.
|
||
|
|
#
|
||
|
|
# So, we use -readnever to read minimal symbols, but not non-miminal symbols.
|
||
|
|
#
|
||
|
|
# Because the code at _exit may be and usually is optimized, the test is in
|
||
|
|
# the gdb.opt directory.
|
||
|
|
|
||
|
|
standard_testfile
|
||
|
|
|
||
|
|
# See if we have target board readnow.exp or similar.
|
||
|
|
if { [lsearch -exact $GDBFLAGS -readnow] != -1 \
|
||
|
|
|| [lsearch -exact $GDBFLAGS --readnow] != -1 } {
|
||
|
|
untested "--readnever not allowed in combination with --readnow"
|
||
|
|
return -1
|
||
|
|
}
|
||
|
|
|
||
|
|
save_vars { GDBFLAGS } {
|
||
|
|
append GDBFLAGS " -readnever"
|
||
|
|
|
||
|
|
if {[prepare_for_testing "failed to prepare" $testfile $srcfile nodebug]} {
|
||
|
|
return -1
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if ![runto_main] then {
|
||
|
|
return 0
|
||
|
|
}
|
||
|
|
|
||
|
|
gdb_breakpoint "_exit"
|
||
|
|
|
||
|
|
# Give some background information about the breakpoint(s) and corresponding
|
||
|
|
# the shared lib(s).
|
||
|
|
gdb_test "info breakpoints"
|
||
|
|
gdb_test "info shared"
|
||
|
|
|
||
|
|
# If the skip_prologue analysis of _exit is too eager, we may not hit the
|
||
|
|
# breakpoint.
|
||
|
|
gdb_continue_to_breakpoint "_exit" "_exit \\(\\) .*"
|