windows-xp/Source/XPSP1/NT/base/mvdm/wow16/inc/klayer.inc

;=======================================================
;
; Macros stolen from cmacros.inc (so we don't have to include it all)
;
    .286p

externNP    macro   n
    irp x,<n>
    extrn x:near
    endm
endm

externFP    macro   n
    irp x,<n>
    extrn x:far
    endm
endm

externW     macro   w
    irp x,<w>
        extrn x:word
    endm
endm

assumes     macro s,ln
    assume  s:_&ln
endm

createSeg   macro n,ln,a,co,cl,grp
    n segment a co '&cl'
    n ends
endm

sBegin      macro   seg
    assume  cs:_&seg
    _&seg   segment
endm

sEnd        macro   seg
    _&seg ends
    assume  cs:nothing
endm

errnz macro x               ;;display error if expression is <>0
  if2
    if x                ;;if expression is non-zero,
      errnz1  <x>,%(x)
    endif
  endif
endm

errnz1 macro x1,x2
  = *errnz* x1 = x2
  .err
endm

errn$ macro l,x             ;;error if <$-label1 (exp2)> <>0
  errnz   <offset $ - offset l x>
endm

createSeg _DATA,DATA,WORD,PUBLIC,DATA

;=======================================================
;
; Error API definitions
;
ExternFP    <HandleParamError>

; error codes
include logerror.inc

;================================================================
;   Variable and temporary initialization

VLseg  equ <>      ; Holds current segment name

VLopen = 0
VLerrnotinvoked  = 0
ifndef VLnogenpall
VLnogenpall = 0
endif

VLnogen        = 0
VLnogenparm    = 0

VLsavees       = 0
VLsavebx       = 0

;if1
if 1

;================================================================
;   Utility macros

;---------------------------------------------------------------------------
;
; lodsw cs:[si]
;
cslodsw macro
    db  2eh     ;; CS override
    lodsw
endm

;---------------------------------------------------------------------------
;
; lodsb cs:[si]
;
cslodsb macro
    db  2eh     ;; CS override
    lodsb
endm

SkipTwoBytes macro
    db  0A9h    ;; Opcode for CMP AX,(immediate word)
endm

;---------------------------------------------------------------------------
;
; Define a as the concatenation of b & c
;
concat  macro   a,b,c,d,e,f
a   equ <b&c&d&e&f>
endm

;---------------------------------------------------------------------------
;
; Assign a to b.
;
equate  macro   a,b
    a   = b
endm

;
; Print a message
;
_print  macro a,b,c
if2
    %out   a&b&c
endif
endm


;===============================================================

;---------------------------------------------------------------------------
;
; _gensub   LABEL
;
; Causes per-segment subroutine code associated with type LABEL
; to be generated, by setting the genLABEL&lseg flag.
;
_gensub2    macro   l,s
    gen&l&s = 1
endm

_gensub macro   l
        _gensub2    <l>,%VLseg
endm

;---------------------------------------------------------------------------
; _SwitchSeg
;
; Switches current segment to seg, creating the segment if needed.
;
_SwitchSeg   macro   seg,oldseg
    ifdifi  <&seg>,<oldseg>

      ifnb  <oldseg>
sEnd oldseg
      endif

    concat  <VLseg>,seg,

createSeg _&seg,seg,WORD,PUBLIC,CODE

sBegin seg
assumes CS,seg

    endif
endm


;---------------------------------------------------------------------------
; API
;
API macro   rettype,name,seg,optlist

    if  VLopen
    APIEND
    endif

VLname equ <name>
VLcbparms      = 0
VLcbskip       = 0
VLerrnotinvoked= 1
VLopen         = 1
VLnogen        = 0
VLnogenparm    = 0
VLasm          = 0
VLfunnyframe   = 0
VLnodata       = 0
VLcargs        = 0
VLplist        equ <>
VLATMframe     = 0      ; special entry/exit code sequence for ATM's patching
VLATMfrmds     = 0      ; ATM entry/exit code: mov ax,_DATA at beginning.

VLsavees    = 0
VLsavebx        = 0
    _SwitchSeg seg,%VLseg

    irp opt,<optlist>

      ifidni  <opt>,<NOGEN>
      VLnogen = 1
      endif

      ifidni  <opt>,<VOID>
      VLnogen = 1
      endif

      ifidni  <opt>,<ASM>
      VLasm = 1
      endif

      ifidni  <opt>,<ATMFRAME>
      VLATMframe = 1
      endif

      ifidni  <opt>,<ATMFRAMEDS>
      VLATMfrmds = 1
      VLATMframe = 1
      endif

      ifidni  <opt>,<FUNNYFRAME>
      VLfunnyframe = 1
      endif

      ifidni  <opt>,<NODATA>
      VLnodata = 1
      endif

      ifidni  <opt>,<DEBUGONLY>
        ifndef DEBUG
        VLnogen = 1
        endif
      endif

      ifidni  <opt>,<C>
      VLcargs  = 1
      endif

      ifidni  <opt>,<SAVEES>
      VLsavees  = 2     ; sizeof(ES)
      endif

      ifidni  <opt>,<SAVEBX>
      VLsavebx  = 2     ; sizeof(BX)
      endif

    endm

concat  <VLsegoffset>,<seg>,<offset>
concat  <VLnameerror>,<name>,<_error>
concat  <VLnamecbparms>,<name>,<cbparms>

    if1
equate %VLnamecbparms, %VLcbparms
    else
equate %VLnamecbparms, %VLnamecbparms
    endif

    ife VLnogen

    ife VLcargs
concat  <VLiname>,<I>,<name>
ExternNP I&name

public  name
name:
    else
concat  <VLiname>,<_I>,<name>
ExternNP _I&name

public  _&name
_&name:
    endif

VLframe =   0           ; no frame set up yet.

    endif  ; VLnogen

endm    ;; VL

;---------------------------------------------------------------------------
; APIERR
;
; Optionally used after parameter decls to begin error handling code
;
APIERR  macro   opts

    ife VLnogen
      ife VLframe
    _print  <Nothing to validate for >,%VLiname
      else
    pop dx      ; pop off error handler address
    pop bp      ; restore BP
       if VLATMframe
    dec bp      ; fix BP back up
       endif
       if VLsavees
    pop es
       endif
       if VLsavebx
        pop     bx
       endif
      endif
    jmp VLiname     ; jmp to internal routine.

equate %VLnamecbparms, %VLcbparms

VLnameerror:
    VLerrnotinvoked  = 0

    endif ; VLnogen

endm    ;; APIERR

;---------------------------------------------------------------------------
; APIEND
;
; Used after APIERR to terminate error handling code.
;
APIEND  macro

_PurgeParms %VLplist

    ife VLnogen

    if  VLerrnotinvoked
    APIERR
    endif
    if VLsavees
    pop es
    endif
    if VLsavebx
        pop     bx
    endif
    ife VLcargs
    retf    VLcbparms
    else
    retf
    endif

VLopen = 0

    endif   ; VLnogen

endm    ;; APIEND

;---------------------------------------------------------------------------
;
; _FlsFrame - Generate frame code
;
_FlsFrame   macro
    ife VLframe
     if VLATMfrmds
    mov ax,_DATA
     endif
     if VLsavebx
        push    bx
     endif
     if VLsavees
    push    es
     endif
     if VLATMframe
    inc bp
    push    bp
    mov bp,sp
    push    ds          ; push ds and pop it off.
    pop ds          ; (we need to pop DS rather than
                    ;  something fast like pop AX because
                    ; ATM doesn't preserve DS itself)
     else
    push    bp
    mov bp,sp
     endif
    push    offset VLnameerror  ; push address of error handler
    VLframe = 1
    endif
endm

;---------------------------------------------------------------------------
; _ChkName
;
; Ensure name was specified

_ChkName    macro name
    ifb <name>
    _print <Missing parameter name in >,%VLiname
    endif
endm

;---------------------------------------------------------------------------
; _ParmOpts
;
; Parse parameter option flags
;
_ParmOpts  macro opts

    VLnogenparm = VLnogenpall

    irp opt,<opts>
    ifidni  <opt>,<DEBUGONLY>
    ifndef DEBUG
        VLnogenparm = 1
    endif
    ifidni  <opt>,<NOGEN>
        VLnogenparm = 1
    endif
    endif
    endm
endm

;---------------------------------------------------------------------------
; _DefParm name,cb,opts
;
; Take care of default parameter stuff, such as defining argument.
;
_DP_Add     macro   old,new
    ifb     <old>
VLplist equ <new>
    else
VLplist equ <old,new>
    endif
endm

_DefParm   macro   name,cb,opts
    _ChkName    <name>
    _ParmOpts   <opts>

  if VLcargs
concat  _P_&name,<[bp]+6+>,%(VLcbparms+VLsavees+VLsavebx)
    VLcbparms=VLcbparms+(cb)
  else
    VLcbparms=VLcbparms+(cb)
concat  _P_&name,<[bp]+6->,%VLcbparms,<+>,%(VLnamecbparms+VLsavees+VLsavebx)
  endif

_DP_Add     %VLplist,<_P_&name>

    VLgen = 1
    if VLnogenparm or VLnogen
        VLgen = 0
    endif
endm

;----------------------------------------------------------------------------
;
; _GenParm  name, cb, opts
;
_GenParm    macro   name,cb,opts
    _DefParm    <name>,<cb>,<opts>
    if VLgen
    _FlsFrame
    endif
endm

lcall2  macro   op,label,seg
    op  label&seg
endm

lcall   macro   label
    lcall2  <call>,<label>,%VLseg
endm

ljmp    macro   label
    lcall2  <jmp>,<label>,%VLseg
endm

;
; _PurgeParms - purge list of parameters we've defined
;
_PurgeParms   macro   list
    irp sym,<list>
sym equ <>
    endm
endm

;---------------------------------------------------------------------------
; LAYER_START
;
; Used before any VL invocations
;
LAYER_START macro
assumes ds,DATA

endm

;---------------------------------------------------------------------------
; LAYER_END
;
; Ends all VL definitions
;
LAYER_END   macro
    if VLsopen
    ENDSTRUCT
    endif
    if VLopen
    APIEND
    endif
    if VLerrnotinvoked
    APIERR
    endif
endm

;=========================================================================
;
; Structure related macros
;
; Structure globals

VLsopen =0

;
; STRUCT - begins a structure declaration
;
STRUCT  macro   name,opts
  if VLsopen
    ENDSTRUCT
  endif
  VLsopen=1

concat  VLcbs,<VLcbs>,name
VLcbstruct  =   0
endm

;
; ENDSTRUCT macro - terminates a STRUCT declaration
;
ENDSTRUCT   macro
equate  %VLcbs,%VLcbstruct

VLsopen =0
endm

;
; Define simple field macro, given:
;   f = macro name
;   cb = size of field
;
_SSize  macro   cb,opts
VLcbstruct  =   VLcbstruct + (cb)
endm

_DefSimpleF macro   f,cb
    f   &macro  name,opts
    equate  _F_&&name,%VLcbstruct
    _SSize  cb
    &endm
endm

_DefSimpleF F_char,1
_DefSimpleF F_BYTE,1

_DefSimpleF F_int,2
_DefSimpleF F_WORD,2
_DefSimpleF F_BOOL,2
_DefSimpleF F_FLAGS,2

_DefSimpleF F_LONG,4
_DefSimpleF F_DWORD,4

_DefSimpleF F_intMBZ,2
_DefSimpleF F_DWORDMBZ,4

_DefSimpleF F_LPVOID,4
_DefSimpleF F_CLPSTR,4
_DefSimpleF F_CLPSTR0,4
_DefSimpleF F_LPSTR,4

_DefSimpleF F_POINT,4
_DefSimpleF F_RECT,8

F_RGB   macro   name,cb,opts
    equate  _F_&name,%VLcbstruct
    _SSize  cb
endm

F_RGCH  equ <F_RGB>

F_RGW   macro   name,cw,opts
    equate  _F_&name,%VLcbstruct
    _SSize  (cw*2)
endm

;
; Generate a P_?LP???? macro, given:
;
; n = parameter macro name (e.g., P_LPRECT)
; r = handler routine name (e.g., LP)
; cb = size of buffer
;
; The generated macro checks only whether the
; buffer is big enough.
;
_GenLP  macro   n,r,cb
    &n      &macro   name,opts
        _GenParm    <name>,4,<opts>
        if VLgen
        mov     ax,_P_&&name
        mov     cx,_P_&&name+2
        mov     bx,cb
        lcall   &r
            _gensub <LP>
    endif
    &endm
endm

;=========================================================================
;
; Generic parameter macros
;
P_2 macro   name, opts
    _DefParm      <name>,2,<opts>
endm

P_4 macro   name, opts
    _DefParm      <name>,4,<opts>
endm

P_char      equ <P_2>
P_int       equ <P_2>
P_BYTE      equ <P_2>
P_BOOL      equ <P_2>
P_WORD      equ <P_2>

P_WORDMBZ   equ <P_2>
P_WORDMBNZ  equ <P_2>

P_LONG      equ <P_4>
P_DWORD     equ <P_4>

;
; Generic handle
;
P_H macro   name, opts
    _GenParm    <name>,2,<opts>
    if VLgen
    mov ax,_P_&name
    lcall   H
        _gensub H
    endif
endm

;
; Generic handle or NULL
;
P_H0    equ <P_2>

;
; Ensure signed value is min <= value <= max
;
P_RVALUE    macro   name, min, max, opts
        local   valok
    _GenParm    <name>,2,<opts>
    if VLgen
    mov ax,_P_&name
    cmp ax,min
    jl  @F
    cmp ax,max
        jle     valok
@@:
        mov     bx,ERR_BAD_VALUE or ERR_WARNING
        lcall   Inval_Param_
valok:
    endif
endm

;
; Ensure signed value is 0 <= value <= max
;
P_VALUE     macro   name, max, opts
    _GenParm    <name>,2,<opts>
    if VLgen
    mov ax,_P_&name
    cmp ax,max
    jbe @F          ;; unsigned comparison to catch < 0.
        mov     bx,ERR_BAD_VALUE or ERR_WARNING
        lcall   Inval_Param_
@@:
    endif
endm

;
; Ensure unsigned value is value <= max
;
P_UVALUE    equ <P_VALUE>

;
; Ensure signed value is 0 <= value <= max
;
P_VALUEW     macro   name, max, opts
    _GenParm    <name>,2,<opts>
    if VLgen
    mov ax,_P_&name
    cmp ax,max
    jbe @F          ;; unsigned comparison to catch < 0.
        mov     bx,ERR_BAD_VALUE or ERR_WARNING
        lcall   Inval_Param_
@@:
    endif
endm

;
; Ensure unsigned value is value <= max
;
P_UVALUEW    equ <P_VALUEW>

;
; Ensure signed byte value is min <= value <= max
;
if 0
P_BVALUE    macro   name,max,opts
    _GenParm    <name>,2,<opts>
    if VLGen
    mov al,_P_&name
    cmp al,max
    jle @F
    lcall   ErrorBValue
@@:
    endif
endm
else
P_BVALUE    equ <P_2>
endif

;
; Ensure that no incorrect bits are set in a flags word
; (i.e., (name & ~valid) == 0)
;
P_FLAGS     macro   name, valid, opts
  _DefParm  <name>,2,<opts>
  if not(valid)
    if VLgen
    _FlsFrame
    mov ax,_P_&name
      ife (low(not(valid)))
    test    ah,high(not(valid))
      else
       ife (high(not(valid)))
    test    al,low(not(valid))
       else
    test    ax,not(valid)
       endif
      endif
    jz  @F
        mov     bx,ERR_BAD_FLAGS or ERR_WARNING
        lcall   Inval_Param_
@@:
    endif
  endif
endm

;
; Ensure that no incorrect bits are set in a flags dword
; (i.e., (name & ~valid) == 0)
;
P_DFLAGS    macro   name, valid_l, valid_h, opts
        local   flagok
  _DefParm   <name>,4,<opts>
  if not(valid_l) or not(valid_h)
    if VLgen
    _FlsFrame
    mov ax,_P_&name
    mov cx,_P_&name+2
      if not(valid_l)
    test    ax,not(valid_l)
       if not(valid_h)
    jnz @F
       else
        jz      flagok
       endif
      endif
      if not(valid_h)
    test    cx,not(valid_h)
        jz      flagok
@@:
      endif
        mov     bx,ERR_BAD_DFLAGS or ERR_WARNING
        lcall   Inval_Param_
flagok:
    endif
  endif
endm

;
; P_LPFN   - function pointer
; P_LPFN0  - function pointer or NULL
;
P_LPFN  macro   name, opts
    _GenParm   <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    lcall   LPFN
        _gensub LPFN
    endif
endm

P_LPFN0 macro   name, opts
    _GenParm   <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    lcall   LPFN0
        _gensub LPFN
    endif
endm

_GenBuf macro p,r
    P_&p  &macro   lpch, cch, opts
    _DefParm    <lpch>,4,<opts>
    _DefParm    <cch>,2,<opts>
        if VLgen
        _FlsFrame
        mov     ax,_P_&&lpch
        mov     cx,_P_&&lpch+2
        mov     bx,_P_&&cch
        lcall   &r
            _gensub LP
    endif
    &endm
endm

_GenBufspl macro p,r
    P_&p  &macro   lpch, cch, opts
    _DefParm    <lpch>,4,<opts>
    _DefParm    <cch>,2,<opts>
        if VLgen
        _FlsFrame
        mov     ax,_P_&&lpch
        mov     cx,_P_&&lpch+2
        lea     bx,_P_&&cch
        lcall   &r
            _gensub LPBUF
    endif
    &endm
endm

_GenBufspl <LPBUFFER>,<LPBUF>
_GenBuf <CLPBUFFER>,<CLP>
_GenBufspl <LPBUFFER0>,<LPBUF0>
_GenBuf <CLPBUFFER0>,<CLP0>

;
; If pszBuf is valid, set its first byte to 0
;
E_SETEMPTY  macro   pszBuf,cchBuf,opts
        push    bp
    mov bp,sp
    mov cx,_P_&cchBuf
        mov     bx,_P_&pszBuf
        mov     dx,_P_&pszBuf+2
    pop bp
        lcall   SETEMPTY
        _gensub SETEMPTY
endm

; Same as above, but with no supplied count
;
E_SETEMPTYNC  macro   pszBuf,opts
        push    bp
        mov     bp,sp
        mov     cx,1
        mov     bx,_P_&pszBuf
        mov     dx,_P_&pszBuf+2
        pop     bp
        lcall   SETEMPTY
        _gensub SETEMPTY
endm

_GenLP  <P_LPSTR>,<LP>,1
_GenLP  <P_LPSTR0>,<LP0>,1

P_CLPSTR macro   name,cch,opts
    _GenParm    <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    ifb <cch>
        mov     bx,-1
    else
        mov     bx,cch
    endif
    lcall   CLPSZ
        _gensub LPSZ
    endif
endm

P_CLPSTR0 macro   name,cch,opts
    _GenParm    <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    ifb <cch>
        mov     bx,-1
    else
        mov     bx,cch
    endif
    lcall   CLPSZ0
        _gensub LPSZ
    endif
endm

_GenLP  <P_LPVOID>,<LP>,1
_GenLP  <P_LPVOID0>,<LP0>,1
_GenLP  <P_CLPVOID>,<CLP>,1
_GenLP  <P_CLPVOID0>,<CLP0>,1

_GenLP  <P_LPBYTE>,<LP>,1
_GenLP  <P_LPBYTE0>,<LP0>,1
_GenLP  <P_CLPBYTE>,<CLP>,1
_GenLP  <P_CLPBYTE0>,<CLP0>,1

_GenLP  <P_LPINT>,<LP>,2
_GenLP  <P_LPINT0>,<LP0>,2
_GenLP  <P_CLPINT>,<CLP>,2
_GenLP  <P_CLPINT0>,<CLP0>,2

_GenLP  <P_LPWORD>,<LP>,2
_GenLP  <P_LPWORD0>,<LP0>,2
_GenLP  <P_CLPWORD>,<CLP>,2
_GenLP  <P_CLPWORD0>,<CLP0>,2

_GenLP  <P_LPBOOL>,<LP>,2
_GenLP  <P_LPBOOL0>,<LP0>,2
_GenLP  <P_CLPBOOL>,<CLP>,2
_GenLP  <P_CLPBOOL0>,<CLP0>,2

_GenLP  <P_LPLONG>,<LP>,4
_GenLP  <P_LPLONG0>,<LP0>,4
_GenLP  <P_CLPLONG>,<CLP>,4
_GenLP  <P_CLPLONG0>,<CLP0>,4

_GenLP  <P_LPDWORD>,<LP>,4
_GenLP  <P_LPDWORD0>,<LP0>,4
_GenLP  <P_CLPDWORD>,<CLP>,4
_GenLP  <P_CLPDWORD0>,<CLP0>,4

;=======================================================================
;
; Common USER types
;
STRUCT  <POINT>
F_int        x
F_int        y
ENDSTRUCT

_GenLP  <P_LPPOINT>,<LP>,%VLcbsPOINT
_GenLP  <P_LPPOINT0>,<LP0>,%VLcbsPOINT
_GenLP  <P_CLPPOINT>,<CLP>,%VLcbsPOINT
_GenLP  <P_CLPPOINT0>,<CLP0>,%VLcbsPOINT
P_POINT     equ <P_4>

STRUCT  <RECT>
F_int        left
F_int        top
F_int        right
F_int        bottom
ENDSTRUCT

_GenLP  <P_LPRECT>,<LP>,%VLcbsRECT
_GenLP  <P_LPRECT0>,<LP0>,%VLcbsRECT
_GenLP  <P_CLPRECT>,<CLP>,%VLcbsRECT
_GenLP  <P_CLPRECT0>,<CLP0>,%VLcbsRECT

;=======================================================================
;
; Common KERNEL types
;
P_GHANDLE   macro   h,opts
    _GenParm   <h>,2,<opts>
    if VLgen
    mov ax,_P_&h
    lcall   GHANDLE
        _gensub GHANDLE
    endif

endm

P_GHANDLE0  macro   h,opts
    _GenParm   <h>,2,<opts>
    if VLgen
    mov ax,_P_&h
    lcall   GHANDLE0
        _gensub GHANDLE
    endif
endm

P_GHANDLE32  macro   h,opts
    _GenParm   <h>,2,<opts>
    if VLgen
    mov ax,_P_&h
    test al, 0100b;
    jz   @F
    lcall   GHANDLE
    @@:
    endif
endm

P_HANDLE    equ <P_H>
P_HANDLE0   equ <P_H0>

P_ATOM      equ <P_H>

P_HINSTANCE equ <P_GHANDLE>
P_HINSTANCE0 equ <P_GHANDLE0>

P_HMODULE   equ <P_GHANDLE>
P_HMODULE0  equ <P_GHANDLE0>
P_HMODULE32 equ <P_GHANDLE32>

P_HTASK     equ <P_GHANDLE>
P_HTASK0    equ <P_GHANDLE0>

P_CLPSTRATOM macro   name, opts
    _GenParm   <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    lcall   CLPSTRATOM
        _gensub LPSZ
    endif
endm

P_CLPSTRATOM0 macro name, opts
    _GenParm   <name>,4,<opts>
    if VLgen
    mov ax,_P_&name
    mov cx,_P_&name+2
    lcall   CLPSTRATOM0
        _gensub LPSZ
    endif
endm

P_CLPSTRRSRC  equ <P_CLPSTRATOM>
P_CLPSTRRSRC0 equ <P_CLPSTRATOM0>

;---------------------------------------------------------------------------
; LAYER_EXPAND  lseg
;
; Expands per-segment validation boilerplate code into segment lseg
;
LAYER_EXPAND    macro   lseg
.list
.lall
    _SwitchSeg  &lseg,%VLseg

public  VStart&lseg
VStart&lseg:

EXTRA_EXPAND    lseg

;
; Handle validation
;
ifdef genH&lseg

public H&lseg
H&lseg:
    or  ax,ax
        jz      @F
    ret
@@:
        mov     bx,ERR_BAD_HANDLE
        jmp     short Inval_Param_&lseg

endif   ; genH&lseg

ifdef genGHANDLE&lseg

public GHANDLE0&lseg
GHANDLE0&lseg:
    or  ax,ax       ; accept NULL
    jz  GHexit&lseg

public GHANDLE&lseg
GHANDLE&lseg:
    test    al,0100b    ; Reject GDT selectors
    jnz      GHldt&lseg
                        ; not yet. Some WOW cursor/icon handles
    cmp  ax, 0f000h     ; look like GDT sels and are > 0xf000
    ifdef JAPAN
    jb   GHerr&lseg     ; Reject GDT sels now.
    else
    jae  GHexit&lseg
    jmp  GHerr&lseg     ; Reject GDT sels now.
    endif		; JAPAN
GHldt&lseg:
    cmp ax,0ffffh   ; special case: -1 -> DS
    jz  GHexit&lseg
    lar dx,ax       ; is it a valid selector?
        jnz     GHerr&lseg
GHexit&lseg:
    ret

GHerr&lseg:
        mov     bx,ERR_BAD_GLOBAL_HANDLE
        jmp     short Inval_Param_&lseg

endif   ; genGHANDLE&lseg

ifdef genLPFN&lseg

;
; Function pointer validation
;
public LPFN0&lseg
LPFN0&lseg:
    mov bx,ax       ; Allow NULL
    or  bx,cx
    jz  LPFN_exit&lseg

public LPFN&lseg
LPFN&lseg:
beg_fault_trap  LPFNbad&lseg
        lar     bx,cx
        jnz     LPFNerr&lseg
        test    bh,8
        jz      LPFNerr&lseg
        mov     es,cx       ; validate pointer & offset
        mov     bx,ax
        mov     al,es:[bx]
end_fault_trap

ifdef DEBUG
;
; Make sure the function is exported by
; ensuring that the first instructions are NOT
; push ds, pop ax or mov ax,ds.
;
    mov bx,es:[bx]+2

        cmp     bx,0581eh                   ; Push ds, pop ax instructions?
        jz      LPFNerr&lseg                ; Yes, must be an error.
        cmp     bx,0d88ch                   ; Mov ax,ds instruction?
        jz      LPFNerr&lseg                ; No, we're ok, so jump ahead
endif   ; DEBUG

LPFN_exit&lseg:
    ret

LPFNbad&lseg:
    fault_fix_stack
LPFNerr&lseg:
        mov     bx,ERR_BAD_FUNC_PTR
        jmp     short Inval_Param_&lseg

endif   ; genLPFN&lseg

public Inval_Param_&lseg
Inval_Param_&lseg:
        pop     dx          ; convert near return addr to far
        push    cs
        push    dx
        jmp     HandleParamError

ifdef genLP&lseg

public LP0&lseg
LP0&lseg:
    or  ax,ax       ; if cx:ax == NULL, exit
    jnz @F
    jcxz    CLPexit&lseg
@@:
public LP&lseg
LP&lseg:
beg_fault_trap  CLPbad&lseg
        mov     es,cx
        or      bx,bx           ; cb == 0?
        jz      CLPexit&lseg    ; yes: just check selector
        dec     bx
        add     bx,ax
        jc      CLPbad1&lseg    ; check 16 bit overflow
        or      byte ptr es:[bx],0  ; check write permission, limit
end_fault_trap
        ret

public CLP0&lseg
CLP0&lseg:
        or      ax,ax           ; Accept ax:cx == 0
    jnz @F
    jcxz    CLPexit&lseg
@@:
public CLP&lseg
CLP&lseg:
beg_fault_trap  CLPbad&lseg
        mov     es,cx
        or      bx,bx           ; cb == 0?
        jz      CLPexit&lseg    ; yes: just check selector
        dec     bx
        add     bx,ax
        jc      CLPbad1&lseg    ; check 16 bit overflow
        mov     bl,es:[bx]      ; check read permission, limit
end_fault_trap

public CLPexit&lseg
CLPexit&lseg:
    ret

CLPbad&lseg:
    fault_fix_stack
CLPbad1&lseg:
        mov     bx,ERR_BAD_PTR
    jmp Inval_Param_&lseg

endif   ; genLP&lseg

ifdef   genLPBUF&lseg
public LPBUF0&lseg
LPBUF0&lseg:
    or  ax,ax       ; if cx:ax == NULL, exit
    jnz @F
    jcxz    LPBUFexit&lseg
@@:
public LPBUF&lseg
LPBUF&lseg:
beg_fault_trap  LPBUFbad&lseg
        mov     es,cx
        mov     cx, word ptr ss:[bx]    ; cb == 0?
        jcxz    LPBUFexit&lseg      ; yes: just check selector
    mov dx, bx
    mov bx, ax
        or      byte ptr es:[bx],0      ; check write permission, start
    mov bx, dx
LPBUFpast1&lseg:
        dec     cx
        add     cx,ax
    jnc @f          ; 16-bit overflow
    mov bx, 0ffffh
    mov cx, bx
        or      byte ptr es:[bx],0      ; check write permission, 64k-1
    jmp LPBUFov&lseg
@@:
    mov bx, cx
        or      byte ptr es:[bx],0      ; check write permission, end
    ret
end_fault_trap

public LPBUFexit&lseg
LPBUFexit&lseg:
    ret
LPBUFbad&lseg:
    mov bx, dx
    pop dx          ; fault ip
    add sp, 2           ; fault
    cmp dx, offset LPBUFpast1&lseg
    jb  LPBUFbad1&lseg

    mov dx, es
    lsl cx, dx
    jnz LPBUFbad1&lseg      ; should not occur, we have loaded es
LPBUFov&lseg:
    sub cx, ax          ; max legal cb
    inc cx
    mov word ptr ss:[bx], cx    ; fix cb passed by user on stack
    mov cx, es          ; HandleParamError prints cx:ax
        mov     bx,ERR_BAD_PTR or ERR_WARNING
    jmp Inval_Param_&lseg
LPBUFbad1&lseg:
    mov cx, es          ; HandleParamError prints cx:ax
        mov     bx,ERR_BAD_PTR
    jmp Inval_Param_&lseg
endif   ; genLPBUF&lseg

ifdef   genLPSZ&lseg

;
; cx:ax -> const pointer to z-terminated string or MAKEINTATOM atom.
;
public CLPSTRATOM0&lseg
CLPSTRATOM0&lseg:
        jcxz    CLPSZexit&lseg  ; If selector is NULL, then all is well.

public CLPSTRATOM&lseg
CLPSTRATOM&lseg:
    jcxz    @F      ; if selector == 0, then may be atom.
        mov     bx,256          ; max string length of 255 characters.
    jmp short CLPSZ&lseg
@@:
    or  ax,ax       ; offset == 0? if so, it's bogus
    jz  ErrorStrPtr&lseg
CLPSZexit&lseg:
    ret
;
; cx:ax => const pointer to zero-terminated string.
; bx    => Maximum string length (including zero terminator)
;
public CLPSZ0&lseg
CLPSZ0&lseg:
        mov     dx,ax
        or      dx,cx
        jz      CLPSZexit&lseg
public CLPSZ&lseg
CLPSZ&lseg:
        push    di              ; preserve these regs
        push    cx
        mov     dx,ax           ; preserve original ax in dx
beg_fault_trap  LPSZfault&lseg
        mov     es,cx
        mov     di,ax

    xor ax,ax
    mov cx,-1
    cld
    repnz   scasb
end_fault_trap
        neg     cx              ; cx = string length + 1
        dec     cx
        cmp     cx,bx           ; error if string length + 1 > cchMax

        pop     cx              ; restore regs before branching
        pop     di
        xchg    ax,dx

        ja      ErrorStrPtr&lseg ; jump if error
        ret

LPSZfault&lseg:
        fault_fix_stack
        pop     cx              ; restore regs
        pop     di
        xchg    ax,dx

public ErrorStrPtr&lseg
ErrorStrPtr&lseg:
    mov bx,ERR_BAD_STRING_PTR
    jmp Inval_Param_&lseg

endif   ; genLPSZ&lseg

ifdef   genSETEMPTY&lseg

public  SETEMPTY&lseg
SETEMPTY&lseg:
        jcxz    SETEMPTYexit&lseg   ; 0-length buffer: do nothing.
beg_fault_trap    SETEMPTYbad&lseg
        mov     es,dx
        mov     byte ptr es:[bx],0  ; jam in a zero terminator
end_fault_trap
SETEMPTYexit&lseg:
    xor ax,ax
    cwd
        ret

SETEMPTYbad&lseg:
        fault_fix_stack
        jmp     short SETEMPTYexit&lseg

endif   ; genSETEMPTY&lseg

public VEnd&lseg
VEnd&lseg:

sEnd    %VLseg
VLseg equ <>

endm    ;LAYER_EXPAND

endif   ;; IF1