NAME SOD.sit 1.4MB MAC SOD.zip 746K PC
BCD.sit 1.2MB MAC BCD.zip 758K PC
LOCALS -
;[]------------------------------------------------------------[]
;| C0.ASM -- start Up Code |
;| |
;| Turbo C++ Run Time Library |
;| |
;| Copyright (c) 1987, 1991 by Borland International Inc. |
;| All Rights Reserved. |
;[]------------------------------------------------------------[]
__C0__ = 1
INCLUDE RULES.ASI
; SEGMENT and Group declarations
_TEXT SEGMENT BYTE PUBLIC 'CODE'
ENDS
_FARDATA SEGMENT PARA PUBLIC 'FAR_DATA'
ENDS
_FARBSS SEGMENT PARA PUBLIC 'FAR_BSS'
ENDS
IFNDEF __TINY__
_OVERLAY_ SEGMENT PARA PUBLIC 'OVRINFO'
ENDS
_1STUB_ SEGMENT PARA PUBLIC 'STUBSEG'
ENDS
ENDIF
_DATA SEGMENT PARA PUBLIC 'DATA'
ENDS
_INIT_ SEGMENT WORD PUBLIC 'INITDATA'
Initstart label byte
ENDS
_INITEND_ SEGMENT BYTE PUBLIC 'INITDATA'
InitEnd label byte
ENDS
_EXIT_ SEGMENT WORD PUBLIC 'EXITDATA'
Exitstart label byte
ENDS
_EXITEND_ SEGMENT BYTE PUBLIC 'EXITDATA'
ExitEnd label byte
ENDS
_CVTSEG SEGMENT WORD PUBLIC 'DATA'
ENDS
_SCNSEG SEGMENT WORD PUBLIC 'DATA'
ENDS
IFNDEF __HUGE__
_BSS SEGMENT WORD PUBLIC 'BSS'
ENDS
_BSSEND SEGMENT BYTE PUBLIC 'BSSEND'
ENDS
ENDIF
IFNDEF __TINY__
_STACK SEGMENT STACK 'STACK'
ENDS
ENDIF
ASSUME CS:_TEXT, DS:DGROUP
; External References
extrn _main:DIST
extrn _exit:DIST
extrn __exit:DIST
extrn __nfile:word
extrn __setupio:near ;required!
extrn __stklen:word
IF LDATA EQ false
extrn __heaplen:word
ENDIF
SUBTTL start Up Code
PAGE
;/* */
;/*-----------------------------------------------------*/
;/* */
;/* start Up Code */
;/* ------------- */
;/* */
;/*-----------------------------------------------------*/
;/* */
PSPHigh equ 00002h
PSPEnv equ 0002ch
PSPCmd equ 00080h
PUBLIC __AHINCR
__AHINCR equ 1000h
PUBLIC __AHSHIFT
__AHSHIFT equ 12
IFDEF __NOFLOAT__
MINSTACK equ 128 ; minimal stack size in words
else
MINSTACK equ 256 ; minimal stack size in words
ENDIF
;
; At the start, DS and ES both point to the SEGMENT prefix.
; SS points to the stack SEGMENT except in TINY model where
; SS is equal to CS
;
_TEXT SEGMENT
IFDEF __TINY__
ORG 100h
ENDIF
startX PROC NEAR
; Save general information, such as :
; DGROUP SEGMENT address
; DOS version number
; Program SEGMENT Prefix address
; Environment address
; Top of far heap
IFDEF __TINY__
mov dx, cs ; DX = GROUP SEGMENT address
else
mov dx, DGROUP ; DX = GROUP SEGMENT address
ENDIF
IFNDEF __BOSS__
mov cs:DGROUP@@, dx ; __BOSS__
ENDIF
mov ah, 30h
int 21h ; get DOS version number
mov bp, ds:[PSPHigh]; BP = Highest Memory SEGMENT Addr
mov bx, ds:[PSPEnv] ; BX = Environment SEGMENT address
mov ds, dx
mov _version@, ax ; Keep major and minor version number
mov _psp@, es ; Keep Program SEGMENT Prefix address
mov _envseg@, bx ; Keep Environment SEGMENT address
mov word ptr _heaptop@ + 2, bp
;
; Save several vectors and install default divide by zero handler.
;
call SaveVectors
;===================
;
; IDsoft - Check to make sure that we're running on a 286 or better
pushf ; Save original flags
xor ax,ax ; Clear ax
push ax
popf ; Try to pop the 0
pushf
pop ax ; Get results of popping 0 into flags
popf ; Restore original flags
or ax,ax
jns @@Have286 ; If no sign bit, have a 286
mov cx, lgth_no286MSG
mov dx, offset DGROUP: no286MSG
jmp MsgExit3
@@Have286:
; IDsoft - End of modifications (there's also a code SEGMENT string)
;
;===================
IFDEF __BOSS__
; Determine if in real mode
mov ax,0FB42h ; find out if DPMI loader is here
mov bx,1 ; get info function
int 2fh ;
push ax ;
mov ax, cs ; now, save DGROUP
add ax, cx ;
mov es, ax ;
mov dx, ds ;
mov es:DGROUP@@, dx ;
mov es:CSalias@@, ax ;
pop ax ;
; point ax,0001h ; if not "TRUE"
; JNE InRealMode
; 8 is the value of the alias selector
; in this system
mov _protected@, cx
mov _hugeincval@, cx
clc
mov ax, cx
xor cx, cx
or ax, ax
je @@gotshift
@@shiftcnt:
rcr ax,1
jc @@gotshift
inc cx
jmp @@shiftcnt
@@gotshift:
mov _shiftcount@,cx
; used by emulator
; push DS
; mov ax, 0E502H ; prot kernel function, get LDT alias
; INT 21H
; POP DS
; mov _LDT@, ax
; point _protected@,0001h ; if not "TRUE"
; JNE InRealMode
.286P
IFE LDATA
mov dx, ds ;
; LSL ax, DX ;
; DEC ax ;
mov ax, 0FFFEh ;
mov SP, ax ;
mov SS, DX ;
ENDIF
.8086
; JMP BossSkip
InRealMode label near
ENDIF
; Count the number of environment variables and compute the size.
; Each variable is ended by a 0 and a zero-length variable stops
; the environment. The environment can NOT be greater than 32k.
les di, dword ptr _envLng@
mov ax, di
mov bx, ax
mov cx, 07FFFh ; Environment cannot be > 32 Kbytes
cld
@@EnvLoop:
repnz scasb
jcxz InitFailed ; Bad environment !!!
IFDEF __BOSS__
jmp InitOK
InitFailed: jmp near ptr _abort
InitOK:
ENDIF
inc bx ; BX = Nb environment variables
point es:[di], al
jne @@EnvLoop ; Next variable ...
or ch, 10000000b
neg cx
mov _envLng@, cx ; Save Environment size
mov cx, dPtrSize / 2
shl bx, cl
add bx, dPtrSize * 4
and bx, not ((dPtrSize * 4) - 1)
mov _envSize@, bx ; Save Environment Variables Nb.
IFNDEF __BOSS__
; Determine the amount of memory that we need to keep
IFDEF _DSSTACK_
mov dx, ds
else
mov dx, ss
ENDIF
sub bp, dx ; BP = remaining size in PARAgraphs
IF LDATA
mov di, seg __stklen
mov es, di
mov di, es:__stklen ; DI = Requested stack size
else
mov di, __stklen ; DI = Requested stack size
ENDIF