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Fri, 18 Dec 2020 03:27:15 -0800 (PST) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id a17sm13644131wrs.20.2020.12.18.03.27.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Dec 2020 03:27:13 -0800 (PST) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 117011FF90; Fri, 18 Dec 2020 11:27:08 +0000 (GMT) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH v2 4/9] gdbstub: implement a softmmu based test Date: Fri, 18 Dec 2020 11:27:02 +0000 Message-Id: <20201218112707.28348-5-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201218112707.28348-1-alex.bennee@linaro.org> References: <20201218112707.28348-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x436.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Eduardo Habkost , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson , "open list:ARM TCG CPUs" , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This adds a new tests that allows us to test softmmu only features including watchpoints. To do achieve this we need to: - add _exit: labels to the boot codes - write a memory.py test case - plumb the test case into the build system - tweak the run_test script to: - re-direct output when asked - use socket based connection for all tests - add a small pause before connection Signed-off-by: Alex Bennée --- tests/guest-debug/run-test.py | 36 +++-- tests/tcg/aarch64/Makefile.softmmu-target | 1 + tests/tcg/aarch64/system/boot.S | 1 + tests/tcg/i386/Makefile.softmmu-target | 1 + tests/tcg/i386/system/boot.S | 2 +- tests/tcg/multiarch/gdbstub/memory.py | 130 ++++++++++++++++++ .../multiarch/system/Makefile.softmmu-target | 19 ++- tests/tcg/x86_64/Makefile.softmmu-target | 1 + tests/tcg/x86_64/system/boot.S | 2 +- 9 files changed, 181 insertions(+), 12 deletions(-) create mode 100644 tests/tcg/multiarch/gdbstub/memory.py diff --git a/tests/guest-debug/run-test.py b/tests/guest-debug/run-test.py index 0c4f5c3808..8b91ff95af 100755 --- a/tests/guest-debug/run-test.py +++ b/tests/guest-debug/run-test.py @@ -16,6 +16,7 @@ import subprocess import shutil import shlex import os +from time import sleep from tempfile import TemporaryDirectory def get_args(): @@ -27,10 +28,21 @@ def get_args(): required=True) parser.add_argument("--test", help="GDB test script", required=True) - parser.add_argument("--gdb", help="The gdb binary to use", default=None) + parser.add_argument("--gdb", help="The gdb binary to use", + default=None) + parser.add_argument("--output", help="A file to redirect output to") return parser.parse_args() + +def log(output, msg): + if output: + output.write(msg + "\n") + output.flush() + else: + print(msg) + + if __name__ == '__main__': args = get_args() @@ -42,18 +54,25 @@ if __name__ == '__main__': if not args.gdb: print("We need gdb to run the test") exit(-1) + if args.output: + output = open(args.output, "w") + else: + output = None socket_dir = TemporaryDirectory("qemu-gdbstub") socket_name = os.path.join(socket_dir.name, "gdbstub.socket") # Launch QEMU with binary if "system" in args.qemu: - cmd = "%s %s %s -s -S" % (args.qemu, args.qargs, args.binary) + cmd = "%s %s %s -gdb unix:path=%s,server" % (args.qemu, + args.qargs, + args.binary, + socket_name) else: cmd = "%s %s -g %s %s" % (args.qemu, args.qargs, socket_name, args.binary) - print("QEMU CMD: %s" % (cmd)) + log(output, "QEMU CMD: %s" % (cmd)) inferior = subprocess.Popen(shlex.split(cmd)) # Now launch gdb with our test and collect the result @@ -63,16 +82,15 @@ if __name__ == '__main__': # disable prompts in case of crash gdb_cmd += " -ex 'set confirm off'" # connect to remote - if "system" in args.qemu: - gdb_cmd += " -ex 'target remote localhost:1234'" - else: - gdb_cmd += " -ex 'target remote %s'" % (socket_name) + gdb_cmd += " -ex 'target remote %s'" % (socket_name) # finally the test script itself gdb_cmd += " -x %s" % (args.test) - print("GDB CMD: %s" % (gdb_cmd)) - result = subprocess.call(gdb_cmd, shell=True); + sleep(1) + log(output, "GDB CMD: %s" % (gdb_cmd)) + + result = subprocess.call(gdb_cmd, shell=True, stdout=output) # A negative result is the result of an internal gdb failure like # a crash. We force a return of 0 so we don't fail the test on diff --git a/tests/tcg/aarch64/Makefile.softmmu-target b/tests/tcg/aarch64/Makefile.softmmu-target index 1057a8ac49..a7286ac295 100644 --- a/tests/tcg/aarch64/Makefile.softmmu-target +++ b/tests/tcg/aarch64/Makefile.softmmu-target @@ -15,6 +15,7 @@ CRT_PATH=$(AARCH64_SYSTEM_SRC) LINK_SCRIPT=$(AARCH64_SYSTEM_SRC)/kernel.ld LDFLAGS=-Wl,-T$(LINK_SCRIPT) TESTS+=$(AARCH64_TESTS) $(MULTIARCH_TESTS) +EXTRA_RUNS+=$(MULTIARCH_RUNS) CFLAGS+=-nostdlib -ggdb -O0 $(MINILIB_INC) LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc diff --git a/tests/tcg/aarch64/system/boot.S b/tests/tcg/aarch64/system/boot.S index b14e94f332..e190b1efa6 100644 --- a/tests/tcg/aarch64/system/boot.S +++ b/tests/tcg/aarch64/system/boot.S @@ -197,6 +197,7 @@ __start: bl main /* pass return value to sys exit */ +_exit: mov x1, x0 ldr x0, =0x20026 /* ADP_Stopped_ApplicationExit */ stp x0, x1, [sp, #-16]! diff --git a/tests/tcg/i386/Makefile.softmmu-target b/tests/tcg/i386/Makefile.softmmu-target index 1c8790eecd..5266f2335a 100644 --- a/tests/tcg/i386/Makefile.softmmu-target +++ b/tests/tcg/i386/Makefile.softmmu-target @@ -19,6 +19,7 @@ CFLAGS+=-nostdlib -ggdb -O0 $(MINILIB_INC) LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc TESTS+=$(MULTIARCH_TESTS) +EXTRA_RUNS+=$(MULTIARCH_RUNS) # building head blobs .PRECIOUS: $(CRT_OBJS) diff --git a/tests/tcg/i386/system/boot.S b/tests/tcg/i386/system/boot.S index 90aa174908..794c2cb0ad 100644 --- a/tests/tcg/i386/system/boot.S +++ b/tests/tcg/i386/system/boot.S @@ -76,7 +76,7 @@ _start: */ call main - /* output any non-zero result in eax to isa-debug-exit device */ +_exit: /* output any non-zero result in eax to isa-debug-exit device */ test %al, %al jz 1f out %ax, $0xf4 diff --git a/tests/tcg/multiarch/gdbstub/memory.py b/tests/tcg/multiarch/gdbstub/memory.py new file mode 100644 index 0000000000..67864ad902 --- /dev/null +++ b/tests/tcg/multiarch/gdbstub/memory.py @@ -0,0 +1,130 @@ +from __future__ import print_function +# +# Test some of the softmmu debug features with the multiarch memory +# test. It is a port of the original vmlinux focused test case but +# using the "memory" test instead. +# +# This is launched via tests/guest-debug/run-test.py +# + +import gdb +import sys + +failcount = 0 + + +def report(cond, msg): + "Report success/fail of test" + if cond: + print("PASS: %s" % (msg)) + else: + print("FAIL: %s" % (msg)) + global failcount + failcount += 1 + + +def check_step(): + "Step an instruction, check it moved." + start_pc = gdb.parse_and_eval('$pc') + gdb.execute("si") + end_pc = gdb.parse_and_eval('$pc') + + return not (start_pc == end_pc) + + +# +# Currently it's hard to create a hbreak with the pure python API and +# manually matching PC to symbol address is a bit flaky thanks to +# function prologues. However internally QEMU's gdbstub treats them +# the same as normal breakpoints so it will do for now. +# +def check_break(sym_name): + "Setup breakpoint, continue and check we stopped." + sym, ok = gdb.lookup_symbol(sym_name) + bp = gdb.Breakpoint(sym_name, gdb.BP_BREAKPOINT) + + gdb.execute("c") + + # hopefully we came back + end_pc = gdb.parse_and_eval('$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") + +# +# This runs as the script it sourced (via -x, via run-test.py) +# +try: + inferior = gdb.selected_inferior() + arch = inferior.architecture() + print("ATTACHED: %s" % arch.name()) +except (gdb.error, AttributeError): + print("SKIPPING (not connected)", file=sys.stderr) + exit(0) + +if gdb.parse_and_eval('$pc') == 0: + print("SKIP: PC not set") + exit(0) + +try: + # These are not very useful in scripts + gdb.execute("set pagination off") + + # Run the actual tests + run_test() +except (gdb.error): + print("GDB Exception: %s" % (sys.exc_info()[0])) + failcount += 1 + pass + +# Finally kill the inferior and exit gdb with a count of failures +gdb.execute("kill") +exit(failcount) diff --git a/tests/tcg/multiarch/system/Makefile.softmmu-target b/tests/tcg/multiarch/system/Makefile.softmmu-target index db4bbeda44..4657f6e4cf 100644 --- a/tests/tcg/multiarch/system/Makefile.softmmu-target +++ b/tests/tcg/multiarch/system/Makefile.softmmu-target @@ -7,8 +7,25 @@ # complications of building. # -MULTIARCH_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/multiarch/system +MULTIARCH_SRC=$(SRC_PATH)/tests/tcg/multiarch +MULTIARCH_SYSTEM_SRC=$(MULTIARCH_SRC)/system VPATH+=$(MULTIARCH_SYSTEM_SRC) MULTIARCH_TEST_SRCS=$(wildcard $(MULTIARCH_SYSTEM_SRC)/*.c) MULTIARCH_TESTS = $(patsubst $(MULTIARCH_SYSTEM_SRC)/%.c, %, $(MULTIARCH_TEST_SRCS)) + +ifneq ($(HAVE_GDB_BIN),) +GDB_SCRIPT=$(SRC_PATH)/tests/guest-debug/run-test.py + +run-gdbstub-memory: memory + $(call run-test, $@, $(GDB_SCRIPT) \ + --gdb $(HAVE_GDB_BIN) \ + --qemu $(QEMU) \ + --output $<.gdb.out \ + --qargs \ + "-monitor none -display none -chardev file$(COMMA)path=$<.out$(COMMA)id=output $(QEMU_OPTS)" \ + --bin $< --test $(MULTIARCH_SRC)/gdbstub/memory.py, \ + "softmmu gdbstub support") + +MULTIARCH_RUNS += run-gdbstub-memory +endif diff --git a/tests/tcg/x86_64/Makefile.softmmu-target b/tests/tcg/x86_64/Makefile.softmmu-target index df252e761c..1bd763f2e6 100644 --- a/tests/tcg/x86_64/Makefile.softmmu-target +++ b/tests/tcg/x86_64/Makefile.softmmu-target @@ -19,6 +19,7 @@ CFLAGS+=-nostdlib -ggdb -O0 $(MINILIB_INC) LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc TESTS+=$(MULTIARCH_TESTS) +EXTRA_RUNS+=$(MULTIARCH_RUNS) # building head blobs .PRECIOUS: $(CRT_OBJS) diff --git a/tests/tcg/x86_64/system/boot.S b/tests/tcg/x86_64/system/boot.S index 73b19a2bda..f8a2fcc839 100644 --- a/tests/tcg/x86_64/system/boot.S +++ b/tests/tcg/x86_64/system/boot.S @@ -124,7 +124,7 @@ _start: /* don't worry about stack frame, assume everthing is garbage when we return */ call main - /* output any non-zero result in eax to isa-debug-exit device */ +_exit: /* output any non-zero result in eax to isa-debug-exit device */ test %al, %al jz 1f out %ax, $0xf4 -- 2.20.1