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target/arm: Make isar_feature_aa32_fp16_arith() handle M-profile

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The M-profile definition of the MVFR1 ID register differs slightly
from the A-profile one, and in particular the check for "does the CPU
support fp16 arithmetic" is not the same.

We don't currently implement any M-profile CPUs with fp16 arithmetic,
so this is not yet a visible bug, but correcting the logic now
disarms this beartrap for when we eventually do.

Backports commit dfc523a84b06b6a4b583ed4c29d24fd980dd37a0
This commit is contained in:
Peter Maydell 2021-03-01 19:17:17 -05:00 committed by Lioncash
parent 09a7d6381e
commit 79feec40df
1 changed files with 26 additions and 5 deletions
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31
qemu/target/arm/cpu.h
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@ -1672,6 +1672,15 @@ FIELD(ID_MMFR4, LSM, 20, 4)
FIELD(ID_MMFR4, CCIDX, 24, 4)
FIELD(ID_MMFR4, EVT, 28, 4)
FIELD(ID_PFR1, PROGMOD, 0, 4)
FIELD(ID_PFR1, SECURITY, 4, 4)
FIELD(ID_PFR1, MPROGMOD, 8, 4)
FIELD(ID_PFR1, VIRTUALIZATION, 12, 4)
FIELD(ID_PFR1, GENTIMER, 16, 4)
FIELD(ID_PFR1, SEC_FRAC, 20, 4)
FIELD(ID_PFR1, VIRT_FRAC, 24, 4)
FIELD(ID_PFR1, GIC, 28, 4)
FIELD(ID_AA64ISAR0, AES, 4, 4)
FIELD(ID_AA64ISAR0, SHA1, 8, 4)
FIELD(ID_AA64ISAR0, SHA2, 12, 4)
@ -1789,10 +1798,12 @@ FIELD(MVFR0, FPROUND, 28, 4)
FIELD(MVFR1, FPFTZ, 0, 4)
FIELD(MVFR1, FPDNAN, 4, 4)
FIELD(MVFR1, SIMDLS, 8, 4)
FIELD(MVFR1, SIMDINT, 12, 4)
FIELD(MVFR1, SIMDSP, 16, 4)
FIELD(MVFR1, SIMDHP, 20, 4)
FIELD(MVFR1, SIMDLS, 8, 4) /* A-profile only */
FIELD(MVFR1, SIMDINT, 12, 4) /* A-profile only */
FIELD(MVFR1, SIMDSP, 16, 4) /* A-profile only */
FIELD(MVFR1, SIMDHP, 20, 4) /* A-profile only */
FIELD(MVFR1, MVE, 8, 4) /* M-profile only */
FIELD(MVFR1, FP16, 20, 4) /* M-profile only */
FIELD(MVFR1, FPHP, 24, 4)
FIELD(MVFR1, SIMDFMAC, 28, 4)
@ -3381,9 +3392,19 @@ static inline bool isar_feature_aa32_predinv(const ARMISARegisters *id)
return FIELD_EX32(id->id_isar6, ID_ISAR6, SPECRES) != 0;
}
static inline bool isar_feature_aa32_mprofile(const ARMISARegisters *id)
{
return FIELD_EX32(id->id_pfr1, ID_PFR1, MPROGMOD) != 0;
}
static inline bool isar_feature_aa32_fp16_arith(const ARMISARegisters *id)
{
return FIELD_EX32(id->mvfr1, MVFR1, FPHP) >= 3;
/* Sadly this is encoded differently for A-profile and M-profile */
if (isar_feature_aa32_mprofile(id)) {
return FIELD_EX32(id->mvfr1, MVFR1, FP16) > 0;
} else {
return FIELD_EX32(id->mvfr1, MVFR1, FPHP) >= 3;
}
}
static inline bool isar_feature_aa32_vfp_simd(const ARMISARegisters *id)