Offline lifter unsupported opcodes

[ailrst]

Both of the below throw unsupported;

• 0xd4207d00
• 0xd503201f

[ndrwbrwn]

Also experienced by 0xd503233f (which is just a variant of the second one already listed)

Instruction is https://www.scs.stanford.edu/~zyedidia/arm64/autia.htm; should be turned into NOP and/or should get ignored when if IsFeatureImplemented(FEAT_PAuth) gets executed (and fails), but that doesn't appear to be happening

Theoretically, aarch64-linux-gnu-gcc -march=armv8-a+nopauth should turn off pointer auth instructions, but that doesn't quite work either.

[katrinafyi]

0xd503233f this one is a funny one. it is a paciasp but it hits a SEE statement

│ ┊ │ ┊ │ ┊ │ ╭─ dis_stmt --> case op2 of EOL INDENT when '000'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "PACIAZ" ) ;
│ ┊ │ ┊ │ ┊ │ } when '001'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "PACIASP" ) ;
│ ┊ │ ┊ │ ┊ │ } when '010'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "PACIBZ" ) ;
│ ┊ │ ┊ │ ┊ │ } when '011'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "PACIBSP" ) ;
│ ┊ │ ┊ │ ┊ │ } when '100'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "AUTIAZ" ) ;
│ ┊ │ ┊ │ ┊ │ } when '101'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "AUTHASP" ) ;
│ ┊ │ ┊ │ ┊ │ } when '110'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "AUTIBZ" ) ;
│ ┊ │ ┊ │ ┊ │ } when '111'  {
│ ┊ │ ┊ │ ┊ │ SEE ( "AUTIBSP" ) ;
│ ┊ │ ┊ │ ┊ │ }  DEDENT
│ ┊ │ ┊ │ ┊ │ ┊ ╭─ dis_expr --> op2
│ ┊ │ ┊ │ ┊ │ ┊ │ ╭─ dis_load --> op2
│ ┊ │ ┊ │ ┊ │ ┊ │ ╰─ = Val(3'001')
│ ┊ │ ┊ │ ┊ │ ┊ ╰─ = Val(3'001')
│ ┊ │ ┊ │ ┊ │ ┊ ╭─ dis_stmt --> SEE ( "PACIASP" ) ;
│ ┊ │ ┊ │ ┊ │ ┊ ╰─ = ()

and it looks like SEE is translated to a NOP. the error we see ("Casting unhandled value type to expression") is in the SystemHintOp_WFE case which wouldn't actually apply to this opcode. however, because SEE is not handled, it falls through to partially evaluating every possible case in the following block, including this WFE case.