MiscStubs.asm

;; Licensed to the .NET Foundation under one or more agreements.
;; The .NET Foundation licenses this file to you under the MIT license.

#include "AsmMacros.h"

    TEXTAREA

; void* PacStripPtr(void *);
; This function strips the pointer of PAC info that is passed as an agrument.
; To avoid failing on non-PAC enabled machines, we use xpaclri (instead of xpaci) which strips lr explicitly.
; Thus we move need to move input in lr, strip it and copy it back to the result register.
    LEAF_ENTRY PacStripPtr
        mov x9, lr
        mov lr, x0
        DCD     0xD50320FF  ; xpaclri instruction in binary to avoid error while compiling with non-PAC enabled compilers
        mov x0, lr
        ret     x9
    LEAF_END PacStripPtr

; void* PacSignPtr(void *);
; This function sign the input pointer using zero as salt.
; To avoid failing on non-PAC enabled machines, we use paciaz (instead of paciza) which signs lr explicitly.
; Thus we need to move input in lr, sign it and then copy it back to the result register.
    LEAF_ENTRY PacSignPtr
        mov x9, lr
        mov lr, x0
        DCD 0xD503231F  ; paciaz instruction in binary to avoid error while compiling with non-PAC enabled compilers
        mov x0, lr
        ret x9
    LEAF_END PacSignPtr

    end