这个都是过去DOS时代的汇编源码，虽然已经过去了，但是对于学习汇编还是有帮助的，汇编语言只是程序员一门基础语言，大多人掌握即可，不一定要深入研究.......
;COBLOAD.ASM 07/09/84 - DKeels
;----------------------------------------------------------------------------
;This program provides COBOL programs with access to the program loader (LOAD)
;by passing parameters via the system parameter area (SYSPARM).
;
;Inputs:
;01 COBLOAD-PARMS
; 05 FILE-SPEC-1 PIC X(80). Contains complete drive, path and filename.
; 05 PARAMETER-1 PIC X(80). Contains command line parameters.
; 05 FILE-SPEC-2 PIC X(80). Same as 1.
; 05 PARAMETER-2 PIC X(80). Same as 1.
;
;Outputs:
; None.
;----------------------------------------------------------------------------
CL_CODE_SEG SEGMENT PUBLIC 'CODE'
ASSUME CS:CL_CODE_SEG,DS:CL_CODE_SEG,ES:CL_CODE_SEG
STACK_PARM STRUC
PUSHED_SI DW ?
PUSHED_DI DW ?
PUSHED_DS DW ?
PUSHED_ES DW ?
PUSHED_BP DW ?
RETURN_IP DW ?
RETURN_CS DW ?
PARM1_OFFSET DW ?
PARM1_DS DW ?
STACK_PARM ENDS
PUBLIC COBLOAD ;make known to COBOL at link time
COBLOAD PROC FAR
;prologue
PUSH BP
PUSH ES
PUSH DS
PUSH DI
PUSH SI
MOV BP,SP ;set base for stack parm structure
;address caller's parameter block
MOV AX,[BP].PARM1_DS
MOV DS,AX ;DS -> cobol data seg
MOV SI,[BP].PARM1_OFFSET ;SI -> offset to parm block
;address load's parameter block in sysparm
MOV DX,'dk' ;verification switch
INT 77H ;get seg addr in AX
MOV ES,AX ;ES -> sysparm
MOV DI,0 ;DI -> offset to LOAD parms
;move cobol's parm block to load's parm block (in sysparm)
CLD ;set direction for moves
MOV CX,80 ;length of move
REP MOVSB ;move file spec 1
ASCIIZ1: MOV BYTE PTR ES:[DI],0 ;make asciiz string
DEC DI
MOV AL,BYTE PTR ES:[DI]
CMP AL,' ' ;nullify trailing spaces
JE ASCIIZ1
MOV BX,81 ;point to parm length byte
MOV BYTE PTR ES:[BX],82 ;init length of parm, + 2
MOV DI,82 ;point to 1st parm position
MOV CX,80 ;length of move
REP MOVSB ;move parm
ADD_CR_1: MOV BYTE PTR ES:[DI],13 ;add carriage return
DEC BYTE PTR ES:[BX] ;sub 1 from length of parm
DEC DI
MOV AL,BYTE PTR ES:[DI]
CMP AL,' ' ;put cr in trailing spaces
JE ADD_CR_1
MOV DI,163
MOV CX,80 ;length of move
REP MOVSB ;move file spec 2
ASCIIZ2: MOV BYTE PTR ES:[DI],0 ;make asciiz string
DEC DI
MOV AL,BYTE PTR ES:[DI]
CMP AL,' ' ;nullify trailing spaces
JE ASCIIZ2
MOV BX,244 ;point to parm length byte
MOV BYTE PTR ES:[BX],82 ;init length of parm, + 2
MOV DI,245 ;point to 1st parm position
MOV CX,80 ;length of move
REP MOVSB ;move parm
ADD_CR_2: MOV BYTE PTR ES:[DI],13 ;add carriage return
DEC BYTE PTR ES:[BX] ;sub 1 from length of parm
DEC DI
MOV AL,BYTE PTR ES:[DI]
CMP AL,' ' ;put cr in trailing spaces
JE ADD_CR_2
;return to caller
POP SI
POP DI
POP DS
POP ES
POP BP
RET 4
COBLOAD ENDP
CL_CODE_SEG ENDS
END