chkstk implementation for win32 with no CRT

win32_chkstk.asm

;; win32_chkstk.asm
;;
;; This is intended as a replacement to the MS C Runtime __chkstk method
;; This is unneeded if not build with /NODEFAULTLIB
;;

.code

__chkstk proc
    sub     rsp, 16
    mov     qword ptr [rsp], r10
    mov     qword ptr [rsp + 8], r11
    xor     r11, r11
    lea     r10, [rsp + 24]
    sub     r10, rax
    cmovb   r10, r11
    mov     r11, qword ptr gs:[16]
    cmp     r10, r11
    bnd     jae done
    and     r10w, 0F000h

force_commit_page:
    lea     r11, [r11 - 4096]
    mov     byte ptr [r11], 0
    cmp     r10, r11
    bnd     jne force_commit_page

done:
    mov     r10, qword ptr [rsp]
    mov     r11, qword ptr [rsp + 8]
    add     rsp, 16
    bnd     ret
__chkstk endp

end