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gem5: classify all test failures

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To skip tests, create a decent list of "which instructions a test use"
and "which instructions each simulator does not support".
This commit is contained in:
Ciro Santilli 六四事件 法轮功
2019-11-05 00:00:00 +00:00
parent 5b67747214
commit 988289f766
2 changed files with 98 additions and 28 deletions
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14
README.adoc
View File

@@ -3815,6 +3815,20 @@ However, in case something goes wrong, you can also try statically linked execut
* gem5 user mode currently only supports static executables as mentioned at: xref:gem5-syscall-emulation-mode[xrefstyle=full]
* QEMU x86_64 guest on x86_64 host was failing with <<stack-smashing-detected>>, but we found a workaround
Running statically linked executables sometimes makes things break:
* <<user-mode-static-executables-with-dynamic-libraries>>
* TODO understand why:
+
....
./run --static --userland userland/c/file_write_read.c
....
fails our assertion that the data was read back correctly:
+
....
Assertion `strcmp(data, output) == 0' faile
....
==== User mode static executables with dynamic libraries
One limitation of static executables is that Buildroot mostly only builds dynamic versions of libraries (the libc is an exception).

112
path_properties.py
View File

@@ -50,7 +50,8 @@ class PathProperties:
# We should get rid of this if we ever properly implement dependency graphs.
'extra_objs_lkmc_common': False,
'gem5_unimplemented_instruction': False,
'qemu_unimplemented_instruction': False,
# Fully, or partially unimplemented.
'gem5_unimplemented_syscall': False,
# For some reason QEMU fails with SIGSEGV on int syscalls in x86_64.
'qemu_x86_64_int_syscall': False,
'interactive': False,
@@ -62,6 +63,7 @@ class PathProperties:
# it only generates intermediate object files. Therefore it
# should not be run while testing.
'no_executable': False,
'qemu_unimplemented_instruction': False,
# The script requires a non-trivial to determine argument to be passed to run properly.
'requires_argument': False,
# Let's not test stuff that relies on the internet by default, user might be offline,
@@ -95,6 +97,34 @@ class PathProperties:
'test_run_args': {},
# Examples that can be built in userland.
'userland': False,
# Known instructions that this test uses, and which may not be implemented
# in a given simulator, in which case we skip.
'uses_instructions': {},
}
unimplemented_instructions = {
'gem5': {
'arm': {
'vcvta',
},
'x86_64': {
'fcomi',
'fcomip',
'fsqrt',
'popcnt',
'rdrand',
'rdtscp',
'vfmadd132pd',
},
},
'qemu': {
'x86_64': {
'popcnt',
'rdtscp',
'rdrand',
'vfmadd132pd',
}
},
}
'''
@@ -160,6 +190,17 @@ class PathProperties:
# Our C compiler does not suppport SVE yet.
# https://cirosantilli.com/linux-kernel-module-cheat#update-gcc-gcc-supported-by-buildroot
os.path.splitext(self.path_components[-1])[1] == '.c' and self['arm_sve']
) and not (
# C++ multithreading in static does not seem to work:
# https://cirosantilli.com/linux-kernel-module-cheat#user-mode-static-executables-with-dynamic-libraries
os.path.splitext(self.path_components[-1])[1] == '.cpp' and (
# TODO the better check here would be for 'static'
# to factor out with test-executable logic, but lazy.
# env['static'] and
env['emulator'] == 'gem5' and
'cpus' in self['test_run_args'] and
self['test_run_args']['cpus'] > 1
)
)
)
@@ -187,8 +228,8 @@ class PathProperties:
not (
env['emulator'] == 'gem5' and
(
self['gem5_unimplemented_instruction'] or
# gem5 does not report signals properly.
self['gem5_unimplemented_syscall'] or
# https://github.com/cirosantilli/linux-kernel-module-cheat/issues/101
self['signal_received'] is not None or
self['requires_dynamic_library'] or
self['requires_semihosting'] or
@@ -198,8 +239,16 @@ class PathProperties:
not (
env['emulator'] == 'qemu' and
(
self['requires_m5ops'] or
self['qemu_unimplemented_instruction']
self['requires_m5ops']
)
) and
not (
env['arch'] in self['uses_instructions'] and
env['emulator'] in self.unimplemented_instructions and
env['arch'] in self.unimplemented_instructions[env['emulator']] and
(
self.unimplemented_instructions[env['emulator']][env['arch']] &
self['uses_instructions'][env['arch']]
)
)
)
@@ -403,7 +452,7 @@ path_properties_tuples = (
},
'vcvta.S': {
'arm_aarch32': True,
'gem5_unimplemented_instruction': True,
'uses_instructions': {'arm': {'vcvta'}}
},
}
),
@@ -450,32 +499,34 @@ path_properties_tuples = (
{},
{
'freestanding': freestanding_properties,
'sqrt_x87.c': {'uses_instructions': {'x86_64': {'fsqrt'}}},
}
),
'intrinsics': (
{},
{
'rdtscp.c': {
'gem5_unimplemented_instruction': True,
'qemu_unimplemented_instruction': True,
},
'rdtscp.c': {'uses_instructions': {'x86_64': {'rdtscp'}}},
}
),
'div_overflow.S': {'signal_received': signal.Signals.SIGFPE},
'div_zero.S': {'signal_received': signal.Signals.SIGFPE},
'fabs.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fadd.S': {'uses_instructions': {'x86_64': {'fcomi'}}},
'faddp.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fchs.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fild.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fld1.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fldz.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fscale.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'fsqrt.S': {'uses_instructions': {'x86_64': {'fcomip', 'fsqrt'}}},
'fxch.S': {'uses_instructions': {'x86_64': {'fcomip'}}},
'lkmc_assert_eq_fail.S': {'signal_received': signal.Signals.SIGABRT},
'lkmc_assert_memcmp_fail.S': {'signal_received': signal.Signals.SIGABRT},
'popcnt.S': {'qemu_unimplemented_instruction': True},
'rdrand.S': {
'gem5_unimplemented_instruction': True,
'qemu_unimplemented_instruction': True,
},
'rdtscp.S': {'qemu_unimplemented_instruction': True},
'popcnt.S': {'uses_instructions': {'x86_64': {'popcnt'}}},
'rdrand.S': {'uses_instructions': {'x86_64': {'rdrand'}}},
'rdtscp.S': {'uses_instructions': {'x86_64': {'rdtscp'}}},
'ring0.c': {'signal_received': signal.Signals.SIGSEGV},
'vfmadd132pd.S': {
'gem5_unimplemented_instruction': True,
'qemu_unimplemented_instruction': True,
},
'vfmadd132pd.S': {'uses_instructions': {'x86_64': {'vfmadd132pd'}}},
}
),
'lkmc_assert_fail.S': {
@@ -506,14 +557,7 @@ path_properties_tuples = (
'cpp': (
{},
{
'atomic.cpp': {
'test_run_args': {'cpus': 3},
# LDADD from LSE
# https://cirosantilli.com/linux-kernel-module-cheat#arm-lse
# Implemented on master:
# https://gem5-review.googlesource.com/c/public/gem5/+/19812
'gem5_unimplemented_instruction': True,
},
'atomic.cpp': {'test_run_args': {'cpus': 3}},
'count.cpp': {'more_than_1s': True},
'sleep_for.cpp': {
'more_than_1s': True,
@@ -544,8 +588,16 @@ path_properties_tuples = (
{
'ctrl_alt_del.c': {'requires_sudo': True},
'init_env_poweroff.c': {'requires_sudo': True},
'mmap_anonymous_touch.c': {
# https://github.com/cirosantilli/linux-kernel-module-cheat/issues/103
'gem5_unimplemented_syscall': True
},
'myinsmod.c': {'requires_sudo': True},
'myrmmod.c': {'requires_sudo': True},
'open_o_tmpfile.c': {
# https://github.com/cirosantilli/linux-kernel-module-cheat/issues/100
'gem5_unimplemented_syscall': True
},
'pagemap_dump.c': {'requires_argument': True},
'poweroff.c': {'requires_sudo': True},
'proc_events.c': {'requires_sudo': True},
@@ -575,6 +627,10 @@ path_properties_tuples = (
'pthread_self.c': {
'test_run_args': {'cpus': 2},
},
'mmap_file.c': {
# https://github.com/cirosantilli/linux-kernel-module-cheat/issues/102
'gem5_unimplemented_syscall': True
},
'wget.c': {'requires_internet': True},
'sleep_forever.c': {'more_than_1s': True},
'virt_to_phys_test.c': {'more_than_1s': True},