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AT

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This is an alias of SYS. This means:

  • The encodings in this description are named to match the encodings of SYS.
  • The description of SYS gives the operational pseudocode for this instruction.

313029282726252423222120191817161514131211109876543210
1101010100001op10111100xop2Rt
LCRnCRm

System

AT <at_op>, <Xt>

is equivalent to

SYS #<op1>, C7, <Cm>, #<op2>, <Xt>

and is the preferred disassembly when SysOp(op1,'0111',CRm,op2) == Sys_AT.

Assembler Symbols

<at_op> Is an AT instruction name, as listed for the AT system instruction group, encoded in op1:CRm<0>:op2:
op1 CRm<0> op2 <at_op> Architectural Feature
000 0 000 S1E1R -
000 0 001 S1E1W -
000 0 010 S1E0R -
000 0 011 S1E0W -
000 1 000 S1E1RP ARMv8.2-ATS1E1
000 1 001 S1E1WP ARMv8.2-ATS1E1
100 0 000 S1E2R -
100 0 001 S1E2W -
100 0 100 S12E1R -
100 0 101 S12E1W -
100 0 110 S12E0R -
100 0 111 S12E0W -
110 0 000 S1E3R -
110 0 001 S1E3W -
<op1>

Is a 3-bit unsigned immediate, in the range 0 to 7, encoded in the "op1" field.

<Cm>

Is a name 'Cm', with 'm' in the range 0 to 15, encoded in the "CRm" field.

<op2>

Is a 3-bit unsigned immediate, in the range 0 to 7, encoded in the "op2" field.

<Xt>

Is the 64-bit name of the general-purpose source register, encoded in the "Rt" field.

Operation

The description of SYS gives the operational pseudocode for this instruction.

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