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92 lines
2.3 KiB
Python
92 lines
2.3 KiB
Python
#
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# Test some of the system debug features with the multiarch memory
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# test. It is a port of the original vmlinux focused test case but
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# using the "memory" test instead.
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#
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# This is launched via tests/guest-debug/run-test.py
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#
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import gdb
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import sys
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from test_gdbstub import main, report
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def check_step():
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"Step an instruction, check it moved."
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start_pc = gdb.parse_and_eval('$pc')
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gdb.execute("si")
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end_pc = gdb.parse_and_eval('$pc')
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return not (start_pc == end_pc)
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#
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# Currently it's hard to create a hbreak with the pure python API and
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# manually matching PC to symbol address is a bit flaky thanks to
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# function prologues. However internally QEMU's gdbstub treats them
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# the same as normal breakpoints so it will do for now.
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#
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def check_break(sym_name):
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"Setup breakpoint, continue and check we stopped."
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sym, ok = gdb.lookup_symbol(sym_name)
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bp = gdb.Breakpoint(sym_name, gdb.BP_BREAKPOINT)
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gdb.execute("c")
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# hopefully we came back
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end_pc = gdb.parse_and_eval('$pc')
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report(bp.hit_count == 1,
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"break @ %s (%s %d hits)" % (end_pc, sym.value(), bp.hit_count))
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bp.delete()
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def do_one_watch(sym, wtype, text):
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wp = gdb.Breakpoint(sym, gdb.BP_WATCHPOINT, wtype)
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gdb.execute("c")
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report_str = "%s for %s" % (text, sym)
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if wp.hit_count > 0:
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report(True, report_str)
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wp.delete()
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else:
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report(False, report_str)
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def check_watches(sym_name):
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"Watch a symbol for any access."
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# Should hit for any read
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do_one_watch(sym_name, gdb.WP_ACCESS, "awatch")
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# Again should hit for reads
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do_one_watch(sym_name, gdb.WP_READ, "rwatch")
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# Finally when it is written
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do_one_watch(sym_name, gdb.WP_WRITE, "watch")
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def run_test():
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"Run through the tests one by one"
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print("Checking we can step the first few instructions")
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step_ok = 0
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for i in range(3):
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if check_step():
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step_ok += 1
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report(step_ok == 3, "single step in boot code")
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# If we get here we have missed some of the other breakpoints.
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print("Setup catch-all for _exit")
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cbp = gdb.Breakpoint("_exit", gdb.BP_BREAKPOINT)
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check_break("main")
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check_watches("test_data[128]")
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report(cbp.hit_count == 0, "didn't reach backstop")
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main(run_test)
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