Store Allocation Tag multiple
This instruction writes a naturally aligned block of N Allocation Tags, where the size of N is identified in GMID_EL1.BS, and the Allocation Tag written to address A is taken from the source register at 4*A<7:4>+3:4*A<7:4>.
This instruction is UNDEFINED at EL0.
This instruction generates an Unchecked access.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | Rn | Rt | ||||||||
| opc | imm9 | op2 | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_MTE2) then EndOfDecode(Decode_UNDEF); constant integer t = UInt(Rt); constant integer n = UInt(Rn);
| <Xt> |
Is the 64-bit name of the general-purpose source register, encoded in the "Rt" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
if PSTATE.EL == EL0 then UNDEFINED; constant bits(64) data = X[t, 64]; bits(64) address; if n == 31 then CheckSPAlignment(); address = SP[64]; else address = X[n, 64]; constant integer size = 4 * (2 ^ (UInt(GMID_EL1.BS))); address = Align(address, size); constant integer count = size >> LOG2_TAG_GRANULE; integer index = UInt(address<LOG2_TAG_GRANULE+3:LOG2_TAG_GRANULE>); constant bits(64) curraddress = address; constant boolean stzgm = FALSE; constant AccessDescriptor accdesc = CreateAccDescLDGSTG(MemOp_STORE, stzgm); for i = 0 to count-1 constant bits(4) tag = Elem[data, index, 4]; AArch64.MemTag[address, accdesc] = tag; address = AddressIncrement(address, TAG_GRANULE, accdesc); index = index + 1;
Internal version only: aarchmrs v2024-12_rel, pseudocode v2024-12_rel ; Build timestamp: 2024-12-15T22:18
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