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author | Alex Bennée <alex.bennee@linaro.org> | 2015-12-17 13:37:15 +0000 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-11-29 19:28:19 -0600 |
commit | 9871a6eda22c8ffa94038ce5a1c2d82cc81d61a5 (patch) | |
tree | d9394eca4e61b14dcee4666a1e330635b05d650b /tests | |
parent | cb6111e080bcfc71422830a87aee6cdbc10a9b96 (diff) | |
download | hqemu-9871a6eda22c8ffa94038ce5a1c2d82cc81d61a5.zip hqemu-9871a6eda22c8ffa94038ce5a1c2d82cc81d61a5.tar.gz |
tests/guest-debug: introduce basic gdbstub tests
The aim of these tests is to combine with an appropriate kernel
image (with symbol-file vmlinux) and check it behaves as it should.
Given a kernel it checks:
- single step
- software breakpoint
- hardware breakpoint
- access, read and write watchpoints
On success it returns 0 to the calling process.
I've not plumbed this into the "make check" logic though as we need a
solution for providing non-host binaries to the tests. However the test
is structured to work with pretty much any Linux kernel image as it
uses the basic kernel_init code which is common across architectures.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1449599553-24713-7-git-send-email-alex.bennee@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'tests')
-rw-r--r-- | tests/guest-debug/test-gdbstub.py | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/tests/guest-debug/test-gdbstub.py b/tests/guest-debug/test-gdbstub.py new file mode 100644 index 0000000..31ba6c9 --- /dev/null +++ b/tests/guest-debug/test-gdbstub.py @@ -0,0 +1,176 @@ +# +# This script needs to be run on startup +# qemu -kernel ${KERNEL} -s -S +# and then: +# gdb ${KERNEL}.vmlinux -x ${QEMU_SRC}/tests/guest-debug/test-gdbstub.py + +import gdb + +failcount = 0 + + +def report(cond, msg): + "Report success/fail of test" + if cond: + print ("PASS: %s" % (msg)) + else: + print ("FAIL: %s" % (msg)) + failcount += 1 + + +def check_step(): + "Step an instruction, check it moved." + start_pc = gdb.parse_and_eval('$pc') + gdb.execute("si") + end_pc = gdb.parse_and_eval('$pc') + + return not (start_pc == end_pc) + + +def check_break(sym_name): + "Setup breakpoint, continue and check we stopped." + sym, ok = gdb.lookup_symbol(sym_name) + bp = gdb.Breakpoint(sym_name) + + gdb.execute("c") + + # hopefully we came back + end_pc = gdb.parse_and_eval('$pc') + print ("%s == %s %d" % (end_pc, sym.value(), bp.hit_count)) + bp.delete() + + # can we test we hit bp? + return end_pc == sym.value() + + +# We need to do hbreak manually as the python interface doesn't export it +def check_hbreak(sym_name): + "Setup hardware breakpoint, continue and check we stopped." + sym, ok = gdb.lookup_symbol(sym_name) + gdb.execute("hbreak %s" % (sym_name)) + gdb.execute("c") + + # hopefully we came back + end_pc = gdb.parse_and_eval('$pc') + print ("%s == %s" % (end_pc, sym.value())) + + if end_pc == sym.value(): + gdb.execute("d 1") + return True + else: + return False + + +class WatchPoint(gdb.Breakpoint): + + def get_wpstr(self, sym_name): + "Setup sym and wp_str for given symbol." + self.sym, ok = gdb.lookup_symbol(sym_name) + wp_addr = gdb.parse_and_eval(sym_name).address + self.wp_str = '*(%(type)s)(&%(address)s)' % dict( + type = wp_addr.type, address = sym_name) + + return(self.wp_str) + + def __init__(self, sym_name, type): + wp_str = self.get_wpstr(sym_name) + super(WatchPoint, self).__init__(wp_str, gdb.BP_WATCHPOINT, type) + + def stop(self): + end_pc = gdb.parse_and_eval('$pc') + print ("HIT WP @ %s" % (end_pc)) + return True + + +def do_one_watch(sym, wtype, text): + + wp = WatchPoint(sym, wtype) + gdb.execute("c") + report_str = "%s for %s (%s)" % (text, sym, wp.sym.value()) + + if wp.hit_count > 0: + report(True, report_str) + wp.delete() + else: + report(False, report_str) + + +def check_watches(sym_name): + "Watch a symbol for any access." + + # Should hit for any read + do_one_watch(sym_name, gdb.WP_ACCESS, "awatch") + + # Again should hit for reads + do_one_watch(sym_name, gdb.WP_READ, "rwatch") + + # Finally when it is written + do_one_watch(sym_name, gdb.WP_WRITE, "watch") + + +class CatchBreakpoint(gdb.Breakpoint): + def __init__(self, sym_name): + super(CatchBreakpoint, self).__init__(sym_name) + self.sym, ok = gdb.lookup_symbol(sym_name) + + def stop(self): + end_pc = gdb.parse_and_eval('$pc') + print ("CB: %s == %s" % (end_pc, self.sym.value())) + if end_pc == self.sym.value(): + report(False, "Hit final catchpoint") + + +def run_test(): + "Run throught the tests one by one" + + print ("Checking we can step the first few instructions") + step_ok = 0 + for i in range(3): + if check_step(): + step_ok += 1 + + report(step_ok == 3, "single step in boot code") + + print ("Checking HW breakpoint works") + break_ok = check_hbreak("kernel_init") + report(break_ok, "hbreak @ kernel_init") + + # Can't set this up until we are in the kernel proper + # if we make it to run_init_process we've over-run and + # one of the tests failed + print ("Setup catch-all for run_init_process") + cbp = CatchBreakpoint("run_init_process") + cpb2 = CatchBreakpoint("try_to_run_init_process") + + print ("Checking Normal breakpoint works") + break_ok = check_break("wait_for_completion") + report(break_ok, "break @ wait_for_completion") + + print ("Checking watchpoint works") + check_watches("system_state") + +# +# This runs as the script it sourced (via -x) +# + +try: + print ("Connecting to remote") + gdb.execute("target remote localhost:1234") + + # These are not very useful in scripts + gdb.execute("set pagination off") + gdb.execute("set confirm off") + + # Run the actual tests + run_test() + +except: + print ("GDB Exception: %s" % (sys.exc_info()[0])) + failcount += 1 + import code + code.InteractiveConsole(locals=globals()).interact() + raise + +# Finally kill the inferior and exit gdb with a count of failures +gdb.execute("kill") +exit(failcount) |