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windows-nt/Source/XPSP1/NT/base/mvdm/wow16/inc/layer.inc

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2020-09-26 03:20:57 -05:00
;=======================================================
;
; 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,BYTE,PUBLIC,CODE
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
ifndef WOW
; don't need that bp and ds stuff
ifidni <opt>,<ATMFRAME>
VLATMframe = 1
endif
ifidni <opt>,<ATMFRAMEDS>
VLATMfrmds = 1
VLATMframe = 1
endif
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
ifdef WOW
_DefSimpleF F_LARGEPOINT,8
endif
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_8 macro name, opts
_DefParm <name>,8,<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
STRUCT <LARGEPOINT>
F_LONG x
F_LONG 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>
_GenLP <P_LPLARGEPOINT>,<LP>,%VLcbsLARGEPOINT
P_LARGEPOINT equ <P_8>
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 ;let zero & BOGUSGDT hInst's through
jz @F
lcall GHANDLE
_gensub 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_HINSTANCE32 equ <P_GHANDLE32>
P_HMODULE equ <P_GHANDLE>
P_HMODULE0 equ <P_GHANDLE0>
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
jz GHerr&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
Reference in a new issue Copy permalink