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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]; if HaveCSRExt() && CallStackRecordingActive() then AddCallStackRecord(); X[30] = PC[] + 4; // Value in BTypeNext will be used to set PSTATE.BTYPE BTypeNext = '10'; BranchTo(target, BranchType_INDCALL);