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target/arm: Implement v8.4-RCPC

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The v8.4-RCPC extension implements some new instructions:
 * LDAPUR, LDAPURB, LDAPURH, LDAPRSB, LDAPRSH, LDAPRSW
 * STLUR, STLURB, STLURH

These are all in a new subgroup of encodings that sits below the
top-level "Loads and Stores" group in the Arm ARM.

The STLUR* instructions have standard store-release semantics; the
LDAPUR* have Load-AcquirePC semantics, but (as with LDAPR*) we choose
to implement them as the slightly stronger Load-Acquire.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200224172846.13053-4-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2020-02-24 17:28:46 +00:00
parent 2677cf9f92
commit a1229109de
4 changed files with 97 additions and 1 deletions
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1
linux-user/elfload.c
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@ -662,6 +662,7 @@ static uint32_t get_elf_hwcap(void)
GET_FEATURE_ID(aa64_condm_4, ARM_HWCAP_A64_FLAGM);
GET_FEATURE_ID(aa64_dcpop, ARM_HWCAP_A64_DCPOP);
GET_FEATURE_ID(aa64_rcpc_8_3, ARM_HWCAP_A64_LRCPC);
GET_FEATURE_ID(aa64_rcpc_8_4, ARM_HWCAP_A64_ILRCPC);
return hwcaps;
}