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target/arm: Enforce M-profile VMRS/VMSR register restrictions
For M-profile before v8.1M, the only valid register for VMSR/VMRS is the FPSCR. We have a comment that states this, but the actual logic to forbid accesses for any other register value is missing, so we would end up with A-profile style behaviour. Add the missing check. Backports ede97c9d71110821738a48f88ff9f10d6bec017f
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@ -632,7 +632,10 @@ static bool trans_VMSR_VMRS(DisasContext *s, arg_VMSR_VMRS *a)
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* Accesses to R15 are UNPREDICTABLE; we choose to undef.
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* (FPSCR -> r15 is a special case which writes to the PSR flags.)
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*/
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if (a->rt == 15 && (!a->l || a->reg != ARM_VFP_FPSCR)) {
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if (a->reg != ARM_VFP_FPSCR) {
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return false;
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}
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if (a->rt == 15 && !a->l) {
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return false;
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}
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}
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