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qemu/atomic128: Split atomic16_read

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Create both atomic16_read_ro and atomic16_read_rw.
Previously we pretended that we had atomic16_read in system mode,
because we "know" that all ram is always writable to the host.
Now, expose read-only and read-write versions all of the time.

For aarch64, do not fall back to __atomic_read_16 even if
supported by the compiler, to work around a clang bug.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-19 18:30:28 -07:00
parent 4deb39ebb3
commit 21c38f31c0
3 changed files with 36 additions and 18 deletions
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2
target/s390x/tcg/mem_helper.c
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@ -1780,7 +1780,7 @@ static uint32_t do_csst(CPUS390XState *env, uint32_t r3, uint64_t a1,
max = 3;
#endif
if ((HAVE_CMPXCHG128 ? 0 : fc + 2 > max) ||
(HAVE_ATOMIC128 ? 0 : sc > max)) {
(HAVE_ATOMIC128_RW ? 0 : sc > max)) {
cpu_loop_exit_atomic(env_cpu(env), ra);
}
}