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target-arm: Don't permit ARMv8-only Neon insns on ARMv7

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The Neon instructions VCVTA, VCVTM, VCVTN, VCVTP, VRINTA, VRINTM,
VRINTN, VRINTP, VRINTX, and VRINTZ were only introduced with ARMv8,
so they need a guard to make them UNDEF if the CPU only supports ARMv7.
(We got this right for all the other new-in-v8 insns, but forgot
it for these Neon 2-reg-misc ops.)

Backports commit fe8fcf3d642b4de1369841bf6acac13e0ec8770d from qemu
This commit is contained in:
Peter Maydell 2018-02-24 18:19:58 -05:00 committed by Lioncash
parent a9fb399490
commit 9bdf310d49
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1 changed files with 28 additions and 0 deletions
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28
qemu/target-arm/translate.c
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@ -5454,6 +5454,30 @@ static int neon_2rm_is_float_op(int op)
op >= NEON_2RM_VRECPE_F);
}
static bool neon_2rm_is_v8_op(int op)
{
/* Return true if this neon 2reg-misc op is ARMv8 and up */
switch (op) {
case NEON_2RM_VRINTN:
case NEON_2RM_VRINTA:
case NEON_2RM_VRINTM:
case NEON_2RM_VRINTP:
case NEON_2RM_VRINTZ:
case NEON_2RM_VRINTX:
case NEON_2RM_VCVTAU:
case NEON_2RM_VCVTAS:
case NEON_2RM_VCVTNU:
case NEON_2RM_VCVTNS:
case NEON_2RM_VCVTPU:
case NEON_2RM_VCVTPS:
case NEON_2RM_VCVTMU:
case NEON_2RM_VCVTMS:
return true;
default:
return false;
}
}
/* Each entry in this array has bit n set if the insn allows
* size value n (otherwise it will UNDEF). Since unallocated
* op values will have no bits set they always UNDEF.
@ -6944,6 +6968,10 @@ static int disas_neon_data_insn(DisasContext *s, uint32_t insn)
if ((neon_2rm_sizes[op] & (1 << size)) == 0) {
return 1;
}
if (neon_2rm_is_v8_op(op) &&
!arm_dc_feature(s, ARM_FEATURE_V8)) {
return 1;
}
if ((op != NEON_2RM_VMOVN && op != NEON_2RM_VQMOVN) &&
q && ((rm | rd) & 1)) {
return 1;