Peter Maydell f02045f5f5 target/arm: Implement new v8.1M NOCP check for exception return ... In v8.1M a new exception return check is added which may cause a NOCP UsageFault (see rule R_XLTP): before we clear s0..s15 and the FPSCR we must check whether access to CP10 from the Security state of the returning exception is disabled; if it is then we must take a fault. (Note that for our implementation CPPWR is always RAZ/WI and so can never cause CP10 accesses to fail.) The other v8.1M change to this register-clearing code is that if MVE is implemented VPR must also be cleared, so add a TODO comment to that effect. Backports 3423fbf10427db7680d3237d4f62d8370052fca0		2021-03-03 18:59:37 -05:00
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arm
i386
m68k
mips
riscv
sparc