target/arm: Add commentary for CPUARMState.exclusive_high
Document the meaning of exclusive_high in a big-endian context, and why we can't change it now. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20230530191438.411344-2-richard.henderson@linaro.org Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -677,8 +677,16 @@ typedef struct CPUArchState {
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uint64_t zcr_el[4]; /* ZCR_EL[1-3] */
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uint64_t smcr_el[4]; /* SMCR_EL[1-3] */
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} vfp;
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uint64_t exclusive_addr;
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uint64_t exclusive_val;
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/*
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* Contains the 'val' for the second 64-bit register of LDXP, which comes
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* from the higher address, not the high part of a complete 128-bit value.
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* In some ways it might be more convenient to record the exclusive value
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* as the low and high halves of a 128 bit data value, but the current
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* semantics of these fields are baked into the migration format.
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*/
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uint64_t exclusive_high;
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/* iwMMXt coprocessor state. */
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