This is a collection of Intel®’ IA32® Software Developer's Manuals (URL of the day) and AMD' AMD64 Architecture Programmer's Manual together with the related specifications, application notes, white papers, and change logs. The collection aims to keep all available revisions. It was originally created by Michal Necasek, see OS/2 Museum.

If you have a public document, related to the IA32® specifications and missing from the collection, please mail it to me. The content of this URL and all sub-ULRs is available for convenient bulk download by rsync x86docs password "" (empty).

BRAA, BRAAZ, BRAB, BRABZ

Branch 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 branches to the authenticated address.

The modifier is:

• In the general-purpose register or stack pointer that is specified by <Xm|SP>, for BRAA and BRAB.
• The value zero, for BRAAZ and BRABZ.

Key A is used for BRAA and BRAAZ. Key B is used for BRAB and BRABZ.

If the authentication passes, the PE continues execution at the target of the branch. For information on behavior if the authentication fails, see Faulting on pointer authentication.

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

This instruction provides a hint that this is not a subroutine call or return.

Integer
(FEAT_PAuth)

Decode for all variants of this encoding

if !IsFeatureImplemented(FEAT_PAuth) then EndOfDecode(Decode_UNDEF); end; if Z == '0' && Rm != '11111' then EndOfDecode(Decode_UNDEF); end; let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let use_key_a : boolean = (M == '0'); let source_is_sp : boolean = ((Z == '1') && (m == 31)); let auth_then_branch : boolean = TRUE;