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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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4
target/sh4/cpu.h
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@ -188,7 +188,9 @@ typedef struct CPUSH4State {
tlb_t itlb[ITLB_SIZE]; /* instruction translation table */
tlb_t utlb[UTLB_SIZE]; /* unified translation table */
uint32_t ldst;
/* LDST = LOCK_ADDR != -1. */
uint32_t lock_addr;
uint32_t lock_value;
/* Fields up to this point are cleared by a CPU reset */
struct {} end_reset_fields;