tests/tcg: Replace -mpower8-vector with -mcpu=power8

[1] deprecated -mpower8-vector, resulting in:

powerpc64-linux-gnu-gcc: warning: switch '-mpower8-vector' is no longer supported
qemu/tes

tests/tcg: Replace -mpower8-vector with -mcpu=power8

[1] deprecated -mpower8-vector, resulting in:

powerpc64-linux-gnu-gcc: warning: switch '-mpower8-vector' is no longer supported
qemu/tests/tcg/ppc64/vsx_f2i_nan.c:4:15: error: expected ';' before 'float'
4 | typedef vector float vsx_float32_vec_t;
| ^~~~~~

Use -mcpu=power8 instead. In order to properly verify that this works,
one needs a big-endian (the minimum supported CPU for 64-bit
little-endian is power8 anyway) GCC configured with --enable-checking
(see GCC commit e154242724b0 ("[RS6000] Don't pass -many to the
assembler").

[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109987

Cc: qemu-stable@nongnu.org
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

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tests/tcg/multiarch: add test for plugin memory access

Add an explicit test to check expected memory values are read/written.
8,16,32 load/store are tested for all arch.
64,128 load/store are tested

tests/tcg/multiarch: add test for plugin memory access

Add an explicit test to check expected memory values are read/written.
8,16,32 load/store are tested for all arch.
64,128 load/store are tested for aarch64/x64.
atomic operations (8,16,32,64) are tested for x64 only.

By default, atomic accesses are non atomic if a single cpu is running,
so we force creation of a second one by creating a new thread first.

load/store helpers code path can't be triggered easily in user mode (no
softmmu), so we can't test it here.

Output of test-plugin-mem-access.c is the list of expected patterns in
plugin output. By reading stdout, we can compare to plugins output and
have a multiarch test.

Can be run with:
make -C build/tests/tcg/$ARCH-linux-user run-plugin-test-plugin-mem-access-with-libmem.so

Tested-by: Xingtao Yao <yaoxt.fnst@fujitsu.com>
Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240910172033.1427812-7-pierrick.bouvier@linaro.org>
Message-Id: <20240916085400.1046925-10-alex.bennee@linaro.org>

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tests/tcg: Skip failing ppc64 multi-threaded tests

In Gitlab CI, some ppc64 multi-threaded tcg tests crash when run in the
clang-user job with an assertion failure in glibc that seems to
indicate co

tests/tcg: Skip failing ppc64 multi-threaded tests

In Gitlab CI, some ppc64 multi-threaded tcg tests crash when run in the
clang-user job with an assertion failure in glibc that seems to
indicate corruption:

signals: allocatestack.c:223: allocate_stack:
Assertion `powerof2 (pagesize_m1 + 1)' failed.

Disable these tests for now.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

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