[PATCH v2 14/14] tests/tcg: finesse the registers check for "hidden" regs

The reason the ppc64 and s390x test where failing was because gdb hides them although they are still accessible via regnum. We can re-arrange the test a little bit and include these two arches in our test. We still don't explicitly fail for registers that just disappear like in the ARM case: xml-tdesc has 228 registers remote-registers has 219 registers of which 0 are hidden {'name': 'CNTP_CVAL', 'regnum': 96} wasn't seen in remote-registers {'name': 'CNTV_CVAL', 'regnum': 101} wasn't seen in remote-registers {'name': 'PAR', 'regnum': 113} wasn't seen in remote-registers {'name': 'CPUACTLR', 'regnum': 114} wasn't seen in remote-registers {'name': 'CPUECTLR', 'regnum': 127} wasn't seen in remote-registers {'name': 'CPUMERRSR', 'regnum': 140} wasn't seen in remote-registers {'name': 'TTBR1', 'regnum': 148} wasn't seen in remote-registers {'name': 'L2MERRSR', 'regnum': 161} wasn't seen in remote-registers {'name': 'TTBR0', 'regnum': 168} wasn't seen in remote-registers Signed-off-by: Alex Bennée <alex.bennee(a)linaro.org&gt; Cc: Ilya Leoshkevich <iii(a)linux.ibm.com&gt; Cc: qemu-s390x(a)nongnu.org Cc: Nicholas Piggin <npiggin(a)gmail.com&gt; Cc: Daniel Henrique Barboza <danielhb413(a)gmail.com&gt; Cc: qemu-ppc(a)nongnu.org Cc: Luis Machado <luis.machado(a)arm.com&gt; --- v2 - skip if check for total_regs != total_r_regs and always dump what is elided/missed --- tests/tcg/multiarch/gdbstub/registers.py | 87 +++++++++++++++++------- tests/tcg/ppc64/Makefile.target | 7 -- tests/tcg/s390x/Makefile.target | 4 -- 3 files changed, 64 insertions(+), 34 deletions(-) diff --git a/tests/tcg/multiarch/gdbstub/registers.py b/tests/tcg/multiarch/gdbstub/registers.py index ff6076b09e..8ba14099b5 100644 --- a/tests/tcg/multiarch/gdbstub/registers.py +++ b/tests/tcg/multiarch/gdbstub/registers.py @@ -44,7 +44,6 @@ def fetch_xml_regmap(): total_regs = 0 reg_map = {} - frame = gdb.selected_frame() tree = ET.fromstring(xml) for f in tree.findall("feature"): @@ -61,12 +60,8 @@ def fetch_xml_regmap(): for r in regs: name = r.attrib["name"] regnum = int(r.attrib["regnum"]) - try: - value = frame.read_register(name) - except ValueError: - report(False, f"failed to read reg: {name}") - entry = { "name": name, "initial": value, "regnum": regnum } + entry = { "name": name, "regnum": regnum } if name in reg_map: report(False, f"duplicate register {entry} vs {reg_map[name]}") @@ -80,6 +75,15 @@ def fetch_xml_regmap(): return reg_map +def get_register_by_regnum(reg_map, regnum): + """ + Helper to find a register from the map via its XML regnum + """ + for regname, entry in reg_map.items(): + if entry['regnum'] == regnum: + return entry + return None + def crosscheck_remote_xml(reg_map): """ Cross-check the list of remote-registers with the XML info. @@ -90,6 +94,7 @@ def crosscheck_remote_xml(reg_map): total_regs = len(reg_map.keys()) total_r_regs = 0 + total_r_elided_regs = 0 for r in r_regs: fields = r.split() @@ -100,6 +105,15 @@ def crosscheck_remote_xml(reg_map): r_name = fields[0] r_regnum = int(fields[6]) + # Some registers are "hidden" so don't have a name + # although they still should have a register number + if r_name == "''": + total_r_elided_regs += 1 + x_reg = get_register_by_regnum(reg_map, r_regnum) + if x_reg is not None: + x_reg["hidden"] = True + continue + # check in the XML try: x_reg = reg_map[r_name] @@ -117,14 +131,39 @@ def crosscheck_remote_xml(reg_map): # Just print a mismatch in totals as gdb will filter out 64 bit # registers on a 32 bit machine. Also print what is missing to # help with debug. - if total_regs != total_r_regs: - print(f"xml-tdesc has ({total_regs}) registers") - print(f"remote-registers has ({total_r_regs}) registers") + print(f"xml-tdesc has {total_regs} registers") + print(f"remote-registers has {total_r_regs} registers") + print(f"of which {total_r_elided_regs} are hidden") + + for x_key in reg_map.keys(): + x_reg = reg_map[x_key] + if "hidden" in x_reg: + print(f"{x_reg} elided by gdb") + elif "seen" not in x_reg: + print(f"{x_reg} wasn't seen in remote-registers") + +def initial_register_read(reg_map): + """ + Do an initial read of all registers that we know gdb cares about + (so ignore the elided ones). + """ + frame = gdb.selected_frame() + + for e in reg_map.values(): + name = e["name"] + regnum = e["regnum"] + + try: + if "hidden" in e: + value = frame.read_register(regnum) + e["initial"] = value + elif "seen" in e: + value = frame.read_register(name) + e["initial"] = value + + except ValueError: + report(False, f"failed to read reg: {name}") - for x_key in reg_map.keys(): - x_reg = reg_map[x_key] - if "seen" not in x_reg: - print(f"{x_reg} wasn't seen in remote-registers") def complete_and_diff(reg_map): """ @@ -144,18 +183,19 @@ def complete_and_diff(reg_map): changed = 0 for e in reg_map.values(): - name = e["name"] - old_val = e["initial"] + if "initial" in e and "hidden" not in e: + name = e["name"] + old_val = e["initial"] - try: - new_val = frame.read_register(name) - except: - report(False, f"failed to read {name} at end of run") - continue + try: + new_val = frame.read_register(name) + except ValueError: + report(False, f"failed to read {name} at end of run") + continue - if new_val != old_val: - print(f"{name} changes from {old_val} to {new_val}") - changed += 1 + if new_val != old_val: + print(f"{name} changes from {old_val} to {new_val}") + changed += 1 # as long as something changed we can be confident its working report(changed > 0, f"{changed} registers were changed") @@ -168,6 +208,7 @@ def run_test(): if reg_map is not None: crosscheck_remote_xml(reg_map) + initial_register_read(reg_map) complete_and_diff(reg_map) diff --git a/tests/tcg/ppc64/Makefile.target b/tests/tcg/ppc64/Makefile.target index 1d08076756..5721c159f2 100644 --- a/tests/tcg/ppc64/Makefile.target +++ b/tests/tcg/ppc64/Makefile.target @@ -38,11 +38,4 @@ PPC64_TESTS += signal_save_restore_xer PPC64_TESTS += xxspltw PPC64_TESTS += test-aes -ifneq ($(GDB),) -# Skip for now until vsx registers sorted out -run-gdbstub-registers: - $(call skip-test, $<, "BROKEN reading VSX registers") -endif - - TESTS += $(PPC64_TESTS) diff --git a/tests/tcg/s390x/Makefile.target b/tests/tcg/s390x/Makefile.target index 46544fecd4..0e670f3f8b 100644 --- a/tests/tcg/s390x/Makefile.target +++ b/tests/tcg/s390x/Makefile.target @@ -103,10 +103,6 @@ run-gdbstub-svc: hello-s390x-asm --bin $< --test $(S390X_SRC)/gdbstub/test-svc.py, \ single-stepping svc) -# Skip for now until vx registers sorted out -run-gdbstub-registers: - $(call skip-test, $<, "BROKEN reading VX registers") - EXTRA_RUNS += run-gdbstub-signals-s390x run-gdbstub-svc endif -- 2.39.2