2014-08-16 06:48:26 +00:00
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; *Not* the original file, but an edit to turn it into an includable slice.
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; Changes include:
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; * removal of RULES.ASI to eliminate redundancy
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; * removal of external data declarations
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; * removal of the segment macro references (for obvious reasons)
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; * and a section of code in CopyPathName, where the Japanese / PC-98 version
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; of the Borland C runtime verifies the executable type in advance, and also
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; checks the entire file extension rather than just its first letter
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; (presumably to eliminate false positives when dealing with Shift-JIS).
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;[]-----------------------------------------------------------------[]
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;| EXEC.ASM -- Execute a program with Overlay |
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;[]-----------------------------------------------------------------[]
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;
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; C/C++ Run Time Library - Version 5.0
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;
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; Copyright (c) 1987, 1992 by Borland International
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; All Rights Reserved.
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;
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;* Miscellaneous equates */
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ExeSignature equ 05A4Dh
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;/* Data for the Loader */
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LdDesc STRUC
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LdErrorMsg db 'Exec failure.',00Dh,00Ah
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LdStack db 80H dup(?) ;Loader stack
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LdPSP dw ? ;PSP address
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LdPathName db 80 dup(?) ;File to be loaded
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LdAX dw ? ;Parse file name results
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LdExeSignature dw ? ;EXE header buffer
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LdLength dw ?
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LdNbPages dw ?
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LdNbItems dw ?
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LdHdrSize dw ?
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LdMin dw ?
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LdMax dw ?
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LdSS dw ?
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LdSP dw ?
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LdCheckSum dw ?
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LdIP dw ?
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LdCS dw ?
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LdLoadAddr dw ? ;Load Overlay interface block
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LdRelocFactor dw ? ;Relocation factor to be used
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LdDesc ENDS
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SUBTTL Loader program
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PAGE
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;/* */
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;/*------------------------------------------------------*/
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;/* */
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;/* Loader Program */
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;/* -------------- */
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;/* */
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;/*------------------------------------------------------*/
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;/* */
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LoaderDatas db size LdDesc dup (0)
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_Loader PROC NEAR ;CX = EnvSeg, DX = End of Memory
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;/* Setup segment registers */
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xor di, di
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mov ax, cs
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mov ds, ax
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mov es, ax
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cli
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mov ss, ax
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lea sp, [di+LdPSP]
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sti
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;/* Load The Program */
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push cx
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push dx
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mov ax, 4B03h
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lea bx, [di+LdLoadAddr]
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lea dx, [di+LdPathName]
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int 21h
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pop dx
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pop cx
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jb LoadError
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xor di, di
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cli
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mov ss, [di+LdSS]
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mov sp, [di+LdSP]
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sti
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mov bp, sp
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xor ax, ax
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push ax ;Return to MSDOS for .COM
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mov ax, [di+LdPSP]
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mov ds, ax
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mov es, ax
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mov es:[2h], dx ;Set End of Program into PSP
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mov es:[2ch], cx ;Set EnvSeg into PSP
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mov ax, cs:[di+LdAX] ;AX = validity of FCBs
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jmp dword ptr cs:[LdIP]
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;/* Fatal Error if unable to load the program */
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LoadError label near
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mov ah, 040h
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mov bx, 2
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mov cx, LdStack - LdErrorMsg
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xor dx, dx
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int 21h ;Error message on stderr
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mov ax, 4C02h
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int 21h ;exit(2)
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_Loader ENDP
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LoaderSize equ ($ - LoaderDatas + 15) / 16
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wLoaderSize equ LoaderSize * 8
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LoaderVector dd _Loader - LoaderDatas
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SUBTTL Loader program
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PAGE
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;/* */
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;/*------------------------------------------------------*/
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;/* */
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;/* int _exec(pathP, cmdP, envP); */
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;/* char *pathP; */
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;/* char *cmdP; */
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;/* char *envP; */
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;/* */
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;/*------------------------------------------------------*/
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;/* */
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pathP equ 4
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IF LDATA
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cmdP equ pathP + 4
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envP equ cmdP + 4
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ELSE
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cmdP equ pathP + 2
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envP equ cmdP + 2
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ENDIF
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FileHandle equ 2
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MemSize equ FileHandle + 2
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EnvSize equ MemSize + 2
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EnvAddr equ EnvSize + 4
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OldEnv equ EnvAddr + 2
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OldEnvSave dw ?
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UseOldEnv db 1 ;flag, defaults to true
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public __exec
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__exec proc near
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push bp
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mov bp, sp
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sub sp, OldEnv
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cld
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push si
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push ds
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push di
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push es
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IFDEF __HUGE__
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mov ds, cs:DGROUP@@ ; Get DS if we're huge
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ENDIF
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mov ax,__envseg ;save old environment
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mov cs:OldEnvSave,ax
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;/* Open the file to be loaded */
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mov ax, 3d00h
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pushDS_
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LDS_ dx, [bp+pathP]
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int 21h
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popDS_
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mov [bp-FileHandle], ax
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jnb CopyCmdLine
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jmp ExecExit
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;/* Copy the command line into the PSP */
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CopyCmdLine label near
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IFDEF __HUGE__
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mov ax, seg _psp@
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mov ds, ax
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ENDIF
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mov es, _psp@
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mov LoaderDatas.LdPSP, es
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mov ax, es:[2ch]
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mov [bp-OldEnv], ax
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mov di, 080h
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pushDS_
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LDS_ si, [bp+cmdP]
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lodsb
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mov dx, si ;Save cmdP for parse
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stosb
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xor cx, cx
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mov cl, al
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inc cx
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rep movsb
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;/* Parse the command line for FCBs */
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mov ax, 2901h
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mov si, dx
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mov di, 05ch
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int 21h ;Build FCB 1 in PSP
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mov byte ptr LoaderDatas.LdAX, al
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FindWhite label near
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mov al,[si]
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cmp al,20h ; Space
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je NextFCB
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cmp al,09h ; Tab
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je NextFCB
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cmp al,0dh ; Carriage Return
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je NextFCB
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inc si
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jmp FindWhite
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NextFCB label near
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mov ax, 2901h
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mov di, 06ch
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int 21h ;Build FCB 2 in PSP
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mov byte ptr LoaderDatas.LdAX+1, al
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popDS_
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;/* Get the maximum memory block size */
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mov ah, 4Ah
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mov bx, -1
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int 21h
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cmp byte ptr _version@, 3
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jnb GetMaxMem
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sub bx, 280h
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GetMaxMem label near
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mov [bp-MemSize], bx
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;/* Compute environment size */
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IF LDATA
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mov ax, [bp+envP]
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mov dx, [bp+envP+2]
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ELSE
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mov ax, [bp+envP]
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or ax, ax
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mov dx, ds
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jnz DoWeHaveAnEnv
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cwd
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ENDIF
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DoWeHaveAnEnv label near
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mov bx, ax
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or bx, dx
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jnz WeHaveAnEnv
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xor ax, ax
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mov di, ax
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jmp short SetEnvSize
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WeHaveAnEnv label near
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mov es, dx
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mov di, ax
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push di
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mov cx, -1
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xor ax, ax
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GetEnvSize label near
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repnz scasb
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cmp es:[di], al
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jne GetEnvSize
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dec cx
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add di, 3
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repnz scasb ;/* EnvSize += PathSize */
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dec cx
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mov ax, cx
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neg ax
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pop di
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SetEnvSize label near
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mov [bp-EnvAddr], di
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mov [bp-EnvAddr+2], es
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add ax, 15
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mov cx, 4
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shr ax, cl
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mov [bp-EnvSize], ax
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mov si,__envseg ;get the arena header for the environ
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dec si
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mov es,si
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cmp ax,word ptr es:[03] ;can we use the orig environ?
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jbe SavePath
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dec cs:UseOldEnv ;set to false
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inc ax
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sub [bp-MemSize], ax ;Reserve space for Env
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;/* Save the pathname of the file to be loaded */
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SavePath label near
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LDS_ si, [bp+pathP]
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push cs
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pop es
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lea di, LoaderDatas.LdPathName
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CopyPathName label near
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lodsb
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stosb
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or al, al
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jnz CopyPathName
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;/* Process the file according to its type */
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mov bx, [bp-FileHandle]
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; PC-98 / Japanese-specific code below...
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; ---
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push ds
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pop es
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push cs
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pop ds
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mov di, offset LoaderDatas
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mov ah, 3fh
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mov cx, LdLoadAddr - LdExeSignature
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lea dx, [di+LdExeSignature]
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int 21h
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jb ExecError
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cmp [di+LdExeSignature], ExeSignature
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jz EXEFile
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mov ax, es:[si-5]
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or ah, ' ' ; one space
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cmp ax, 'c.'
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jnz NoExec
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mov ax, es:[si-3]
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or ax, ' ' ; two spaces
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cmp ax, 'mo'
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jnz NoExec
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jmp COMFile
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NoExec label near
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mov ax, 11
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;/* Here comes all Exec Error */
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ExecError label near
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push ax
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mov ah, 3eh
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mov bx, [bp-FileHandle]
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int 21h
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pop ax
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jmp ExecExit
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;/* This file must be an .EXE file */
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EXEFile label near
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mov ax, [di+LdNbPages]
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xor dx, dx
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mov dl, ah
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mov ah, al
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xor al, al
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shl ax, 1
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rcl dx, 1 ;DX:AX = NbPages * 512
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add ax, [di+LdLength]
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adc dx, 0
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mov cx, 4
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EXECompute label near
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shr dx, 1
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rcr ax, 1
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loop EXECompute
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inc ax
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sub ax, [di+LdHdrSize]
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add ax, [di+LdMin]
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|
|
|
|
xchg bx, ax
|
|
|
|
|
mov ax, [di+LdPSP]
|
|
|
|
|
add ax, 16
|
|
|
|
|
add [di+LdCS], ax
|
|
|
|
|
add [di+LdSS], ax
|
|
|
|
|
xchg ax, bx
|
|
|
|
|
jmp short IsItEnough
|
|
|
|
|
|
|
|
|
|
;/* The file to be loaded is .COM file */
|
|
|
|
|
|
|
|
|
|
COMFile label near
|
|
|
|
|
mov ax, 4202h
|
|
|
|
|
xor cx, cx
|
|
|
|
|
xor dx, dx
|
|
|
|
|
int 21h
|
|
|
|
|
mov cx, 4
|
|
|
|
|
|
|
|
|
|
COMCompute label near
|
|
|
|
|
shr dx, 1
|
|
|
|
|
rcr ax, 1
|
|
|
|
|
loop COMCompute
|
|
|
|
|
inc ax
|
|
|
|
|
xchg bx, ax
|
|
|
|
|
mov ax, [di+LdPSP]
|
|
|
|
|
mov [di+LdCS], ax
|
|
|
|
|
mov [di+LdIP], 0100h
|
|
|
|
|
mov [di+LdSS], ax
|
|
|
|
|
add ax, 16
|
|
|
|
|
xchg ax, bx
|
|
|
|
|
|
|
|
|
|
IsItEnough label near ;AX = Pgm requirements, BX = Pgm Load Addr
|
|
|
|
|
mov [di+LdLoadAddr], bx
|
|
|
|
|
mov [di+LdRelocFactor], bx
|
|
|
|
|
add ax, LoaderSize
|
|
|
|
|
cmp ax, [bp-MemSize]
|
|
|
|
|
mov ax, 8
|
|
|
|
|
jna $+5
|
|
|
|
|
jmp ExecError
|
|
|
|
|
|
|
|
|
|
;/* Close the file before load it */
|
|
|
|
|
|
|
|
|
|
mov ah, 3eh
|
|
|
|
|
mov bx, [bp-FileHandle]
|
|
|
|
|
int 21h
|
|
|
|
|
|
|
|
|
|
;/* Takes all the memory above the current program */
|
|
|
|
|
|
|
|
|
|
mov es, [di+LdPSP]
|
|
|
|
|
mov ah, 4ah
|
|
|
|
|
mov bx, [bp-MemSize]
|
|
|
|
|
int 21h
|
|
|
|
|
jnb $+5
|
|
|
|
|
jmp ExecError
|
|
|
|
|
|
|
|
|
|
;/* Move the Loader before loading the overlay */
|
|
|
|
|
|
|
|
|
|
add bx, [di+LdPSP]
|
|
|
|
|
mov dx, bx ;Save end of memory
|
|
|
|
|
sub bx, LoaderSize+1
|
|
|
|
|
mov word ptr LoaderVector+2, bx
|
|
|
|
|
mov es, bx
|
|
|
|
|
mov cx, wLoaderSize
|
|
|
|
|
mov si, offset LoaderDatas
|
|
|
|
|
xor di, di
|
|
|
|
|
rep movsw
|
|
|
|
|
|
|
|
|
|
;/* Copy the environment */
|
|
|
|
|
|
|
|
|
|
mov es, [bp-OldEnv]
|
|
|
|
|
mov cx, [bp-EnvSize]
|
|
|
|
|
cmp cs:UseOldEnv,0
|
|
|
|
|
jne ReUseEnv
|
|
|
|
|
|
|
|
|
|
mov ah, 48h
|
|
|
|
|
mov bx, cx
|
|
|
|
|
int 21h
|
|
|
|
|
jb ExecExit
|
|
|
|
|
jmp short CopyEnv
|
|
|
|
|
|
|
|
|
|
ReUseEnv: mov ax, cs:OldEnvSave
|
|
|
|
|
CopyEnv: mov es, ax
|
|
|
|
|
xor di, di
|
|
|
|
|
lds si, [bp-EnvAddr]
|
|
|
|
|
add cx, cx
|
|
|
|
|
add cx, cx
|
|
|
|
|
add cx, cx
|
|
|
|
|
rep movsw
|
|
|
|
|
push es
|
|
|
|
|
|
|
|
|
|
;/* Call exit procedures. Note: do not close file handles */
|
|
|
|
|
;/* Once we do this we can't go back! */
|
|
|
|
|
|
|
|
|
|
push dx
|
|
|
|
|
push ds
|
|
|
|
|
mov ds, cs:DGROUP@@ ; Get DS
|
2014-08-22 15:08:37 +00:00
|
|
|
nopcall __cexit
|
2014-08-16 06:48:26 +00:00
|
|
|
pop ds
|
|
|
|
|
pop dx
|
|
|
|
|
|
|
|
|
|
;/* Free the old environment space */
|
|
|
|
|
|
|
|
|
|
cmp cs:UseOldEnv,0
|
|
|
|
|
jne ReadyToOverlay
|
|
|
|
|
mov es, cs:OldEnvSave
|
|
|
|
|
mov ah, 49h
|
|
|
|
|
int 21h
|
|
|
|
|
|
|
|
|
|
;/* Jump to Loader and overlay the current program */
|
|
|
|
|
|
|
|
|
|
ReadyToOverlay label near
|
|
|
|
|
pop cx
|
|
|
|
|
jmp LoaderVector
|
|
|
|
|
|
|
|
|
|
;/* All error conditions set _doserrno and errno */
|
|
|
|
|
|
|
|
|
|
ExecExit label near
|
|
|
|
|
pop es
|
|
|
|
|
pop di
|
|
|
|
|
pop ds
|
|
|
|
|
pop si
|
|
|
|
|
push ax
|
|
|
|
|
call __IOERROR
|
|
|
|
|
mov sp, bp
|
|
|
|
|
pop bp
|
|
|
|
|
ret
|
|
|
|
|
endp
|
