from __future__ import print_function # # Test some of the system debug features with the multiarch memory # test. It is a port of the original vmlinux focused test case but # using the "memory" test instead. # # This is launched via tests/guest-debug/run-test.py # import gdb import sys from test_gdbstub import main, report 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) # # Currently it's hard to create a hbreak with the pure python API and # manually matching PC to symbol address is a bit flaky thanks to # function prologues. However internally QEMU's gdbstub treats them # the same as normal breakpoints so it will do for now. # 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.BP_BREAKPOINT) gdb.execute("c") # hopefully we came back end_pc = gdb.parse_and_eval('$pc') report(bp.hit_count == 1, "break @ %s (%s %d hits)" % (end_pc, sym.value(), bp.hit_count)) bp.delete() def do_one_watch(sym, wtype, text): wp = gdb.Breakpoint(sym, gdb.BP_WATCHPOINT, wtype) gdb.execute("c") report_str = "%s for %s" % (text, sym) 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") def run_test(): "Run through 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") # If we get here we have missed some of the other breakpoints. print("Setup catch-all for _exit") cbp = gdb.Breakpoint("_exit", gdb.BP_BREAKPOINT) check_break("main") check_watches("test_data[128]") report(cbp.hit_count == 0, "didn't reach backstop") main(run_test)