SvarDOSSvarDOS Packages

BlueGreycalmElegant

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  → /svarcom/trunk/rmod.asm @ 489

  → /svarcom/trunk/rmod.asm @ 490

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Ignore whitespace Rev 489 → Rev 490

/svarcom/trunk/rmod.asm
19,20 → 19,23
SIG1 dw 0x1983 ; +0
SIG2 dw 0x1985 ; +2
SIG3 dw 0x2017 ; +4
SIG4 dw 0x2019 ; +6
SIG4 dw 0x2019 ; +6 this acts also as a guardval to detect stack overflows
FFU_UNUSED dw 0 ; +8
; DOS int 21h functions that I use require at least 40 bytes of stack under
; DOS-C (FreeDOS) kernel, so here I reserve 64 bytes juste to be sure
STACKBUF db "XXX SVARCOM RMOD BY MATEUSZ VISTE XXXXXXXXXXXXXXXXXXXXXXXXXXXX"
STACKPTR dw 0
; exit code of last application
LEXCODE dw 0 ; +0Ah
LEXCODE dw 0 ; +4Ah
; offset of the COMSPEC variable in the environment block, 0 means "use
; boot drive". this value is patched by the transient part of COMMAND.COM
COMSPECPTR dw 0 ; +0Ch
COMSPECPTR dw 0 ; +4Ch
; fallback COMSPEC string used if no COMPSEC is present in the environment
; drive. drive is patched by the transient part of COMMAND.COM
COMSPECBOOT db "@:\COMMAND.COM", 0 ; +0Eh
COMSPECBOOT db "@:\COMMAND.COM", 0 ; +4Eh
; ExecParamRec used by INT 21h, AX=4b00 (load and execute program), 14 bytes:
; offset size content
40,12 → 43,12
; +2 4 address of command line to place at PSP:0080
; +6 4 address of an FCB to be placed at PSP:005c
; +0Ah 4 address of an FCB to be placed at PSP:006c
EXEC_PARAM_REC db 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ; +1Dh
EXEC_PARAM_REC db 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ; +5Dh
; Program to execute, preset by SvarCOM (128 bytes, ASCIIZ) ; +2Bh
; Program to execute, preset by SvarCOM (128 bytes, ASCIIZ) ; +6Bh
EXECPROG dd 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
skipsig: ; +ABh
skipsig: ; +EBh
; set up CS=DS=SS and point SP to my private stack buffer
mov ax, cs
145,8 → 148,3
CMDTAIL db 0x01, 0x0A, 0x0D
ERRLOAD db "ERR x, FAILED TO LOAD COMMAND.COM", 13, 10, '$'
; DOS int 21h functions that I use require at least 32 bytes of stack, here I
; allocate 64 bytes to be sure
STACKBUF db "0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF0123456789ABCDEF"
STACKPTR db "xx"