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target/sh4: Use cmpxchg for movco when parallel_cpus

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As for other targets, cmpxchg isn't quite right for ll/sc,
suffering from an ABA race, but is sufficient to implement
portable atomic operations.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <20170907185057.23421-2-richard.henderson@linaro.org>
[aurel32: fix whitespace]
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Richard Henderson 2017-09-07 11:50:53 -07:00 • committed by Aurelien Jarno
parent 6d56fc6cc3
commit f85da3081d
4 changed files with 79 additions and 27 deletions
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target/sh4/helper.c
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@ -171,6 +171,7 @@ void superh_cpu_do_interrupt(CPUState *cs)
env->spc = env->pc;
env->sgr = env->gregs[15];
env->sr |= (1u << SR_BL) | (1u << SR_MD) | (1u << SR_RB);
env->lock_addr = -1;
if (env->flags & DELAY_SLOT_MASK) {
/* Branch instruction should be executed again before delay slot. */