Index

BLR

Branch with Link to Register calls a subroutine at an address in a register, setting register X30 to PC+4.

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 0 1 1 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 Rn 0 0 0 0 0
Z op A M Rm

BLR <Xn>

integer n = UInt(Rn);

Assembler Symbols

<Xn>

Is the 64-bit name of the general-purpose register holding the address to be branched to, encoded in the "Rn" field.

Operation

bits(64) target = X[n, 64];

if IsFeatureImplemented(FEAT_GCS) && GCSPCREnabled(PSTATE.EL) then
    AddGCSRecord(PC64 + 4);
X[30, 64] = PC64 + 4;

// Value in BTypeNext will be used to set PSTATE.BTYPE
BTypeNext = '10';
BranchTo(target, BranchType_INDCALL, FALSE);