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BLRAA, BLRAAZ, BLRAB, BLRABZ

Branch with Link to Register, with pointer authentication.

Syntax

BLRAA Xn, Xm|SP ; BLRAA general registers

BLRAAZ Xn ; BLRAAZ general registers

BLRAB Xn, Xm|SP ; BLRAB general registers

BLRABZ Xn ; BLRABZ general registers

Where:

Xn
Is the 64-bit name of the general-purpose register holding the address to be branched to.
Xm|SP
Is the 64-bit name of the general-purpose source register or stack pointer holding the modifier.

Architectures supported

Supported in ARMv8.3.

Usage

Branch with Link to Register, with pointer authentication. This instruction authenticates the address in the general-purpose register that is specified by Xn, using a modifier and the specified key, and calls a subroutine at the authenticated address, setting register X30 to PC+4.

The modifier is:

  • In the general-purpose register or stack pointer that is specified by Xm|SP for BLRAA and BLRAB.
  • The value zero, for BLRAAZ and BLRABZ.

Key A is used for BLRAA and BLRAAZ, and key B is used for BLRAB and BLRABZ.

If the authentication passes, the PE continues execution at the target of the branch. If the authentication fails, a Translation fault is generated.

The authenticated address is not written back to the general-purpose register.

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