577 lines
12 KiB
NASM
577 lines
12 KiB
NASM
; kern_wasm.asm
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;
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; Open Watcom WASM/MASM-syntax port of the old TASM IDEAL kern.asm.
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; Intended for 16-bit DOS large memory model builds on Linux with Open Watcom v2.
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;
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; Keep kern.asm as the historical TASM source and use this file for the
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; reproducible Open Watcom build.
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.286
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.model large
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.data
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enterIPX dd 0
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.code
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public _IPXinit
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public _IPXopen_socket
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public _IPXclose_socket
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public _IPXlisten
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public _xmemmove
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public _Net_Call
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public _C32_LoadNios_Probe
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public _C32_GetFunc_Probe
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public _C32_CallName0_Probe
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public _Net_Call_VLM_Raw
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_IPXinit proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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mov ax, 7A00h
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int 2Fh
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cmp al, 0FFh
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jne ipxinit_done
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mov cx, @data
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mov ds, cx
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mov word ptr enterIPX, di
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mov ax, es
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mov word ptr enterIPX+2, ax
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mov al, 1
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ipxinit_done:
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mov ah, 0
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXinit endp
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_xmemmove proc far
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push bp
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mov bp, sp
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; far procedure stack layout, large model:
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; [bp+0] old bp
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; [bp+2] return offset
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; [bp+4] return segment
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; [bp+6] z offset
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; [bp+8] z segment
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; [bp+10] q offset
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; [bp+12] q segment
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; [bp+14] nmbr
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cli
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mov cx, [bp+14]
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or cx, cx
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jz xmem_done
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push ds
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push si
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push di
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pushf
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lds si, dword ptr [bp+10]
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les di, dword ptr [bp+6]
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cmp di, si
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jl xmem_forward
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std
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dec cx
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add di, cx
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add si, cx
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inc cx
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jmp xmem_copy
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xmem_forward:
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cld
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xmem_copy:
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rep movsb
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popf
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pop di
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pop si
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pop ds
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xmem_done:
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pop bp
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sti
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ret
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_xmemmove endp
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_IPXopen_socket proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; int IPXopen_socket(UI sock, int live)
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mov ax, [bp+8] ; live
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mov dx, [bp+6] ; sock
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mov bx, @data
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mov ds, bx
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mov bx, 0
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call dword ptr enterIPX
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cmp al, 0FFh
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jne ipxopen_not_already
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mov ax, -1 ; socket already open
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jmp ipxopen_done
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ipxopen_not_already:
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cmp al, 0FEh
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jne ipxopen_ok
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mov ax, -2 ; socket table full
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jmp ipxopen_done
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ipxopen_ok:
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mov ax, dx
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ipxopen_done:
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXopen_socket endp
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_IPXclose_socket proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; void IPXclose_socket(UI sock)
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mov dx, [bp+6]
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mov bx, @data
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mov ds, bx
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mov bx, 1
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call dword ptr enterIPX
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXclose_socket endp
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_IPXlisten proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; int IPXlisten(ECB *ecb)
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les si, dword ptr [bp+6]
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mov bx, @data
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mov ds, bx
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mov bx, 4
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call dword ptr enterIPX
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pop di
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pop si
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pop ds
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pop bp
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mov ah, 0
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ret
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_IPXlisten endp
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_Net_Call proc far
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push bp
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mov bp, sp
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; int Net_Call(UI func, void *req, void *repl)
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; [bp+6] func
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; [bp+8] req offset
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; [bp+10] req segment
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; [bp+12] repl offset
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; [bp+14] repl segment
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mov ax, [bp+6]
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push ds
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push si
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push di
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pushf
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lds si, dword ptr [bp+8]
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les di, dword ptr [bp+12]
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int 21h
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popf
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pop di
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pop si
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pop ds
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pop bp
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mov ah, 0
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ret
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_Net_Call endp
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; int Net_Call_VLM_Raw(UI ax, UI bx, UI cx, UI dx,
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; void *req, void *repl,
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; UI p1, UI p2, UI p3)
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;
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; Experimental VLM entry caller.
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; INT 2F AX=7A20 returns ES:BX = VLM entry if AX == 0000.
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;
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; Register setup for VLM entry:
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; AX, BX, CX, DX from function args
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; DS:SI = req
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; ES:DI = repl
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;
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; Extra stack args pushed before calling VLM entry:
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; p3, p2, p1
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;
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; For NWCREQUEST/VLM test:
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; AX=function
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; BX=numReqFrags
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; CX=connid
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; DX=numReplyFrags
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; DS:SI=reqFragList
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; ES:DI=replyFragList
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; p1=6, p2=20h, p3=0
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_Net_Call_VLM_Raw proc far
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push bp
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mov bp, sp
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sub sp, 4
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push ds
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push si
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push di
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push es
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mov ax, 7A20h
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xor bx, bx
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int 2Fh
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or ax, ax
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jz vlm_raw_found
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mov ax, 88FFh
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jmp short vlm_raw_done
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vlm_raw_found:
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; save VLM entry ES:BX in stack locals
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mov [bp-4], bx
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mov ax, es
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mov [bp-2], ax
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; load caller-requested registers
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mov ax, [bp+6]
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mov bx, [bp+8]
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mov cx, [bp+10]
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mov dx, [bp+12]
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lds si, dword ptr [bp+14]
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les di, dword ptr [bp+18]
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push word ptr [bp+26]
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push word ptr [bp+24]
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push word ptr [bp+22]
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call dword ptr [bp-4]
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vlm_raw_done:
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pop es
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pop di
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pop si
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pop ds
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mov sp, bp
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pop bp
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ret
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_Net_Call_VLM_Raw endp
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; int C32_LoadNios_Probe(UI axfunc, void *outbuf)
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;
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; 16-bit object, but captures 32-bit ESI and ECX using manual 386 opcodes.
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; This keeps the OMF/linker in 16-bit mode while still reading Client32/NIOS
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; values returned by:
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; INT 2F AX=D8C1
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;
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; outbuf:
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; +00 word AX after INT 2F
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; +02 dword ESI after INT 2F
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; +06 dword ECX after INT 2F
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; +0A word BX
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; +0C word CX low
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; +0E word DX
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; +10 word SI low
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; +12 word DS
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; +14 word ES
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_C32_LoadNios_Probe proc far
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push bp
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mov bp, sp
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push ds
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push es
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push si
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push di
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; xor ecx, ecx
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db 66h, 33h, 0C9h
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; xor esi, esi
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db 66h, 33h, 0F6h
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mov ax, [bp+6]
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int 2Fh
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push ds
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push es
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push si
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push cx
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push bx
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push dx
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push ax
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les di, dword ptr [bp+8]
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; restore AX result into AX and store word at out+0
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pop ax
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mov es:[di+0], ax
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; Store ESI dword at es:[di+2].
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; Encoding: ES override + operand-size prefix + MOV r/m32,r32
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; mov es:[di+02], esi = 26 66 89 75 02
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db 26h, 66h, 89h, 75h, 02h
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; Store ECX dword at es:[di+6].
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; mov es:[di+06], ecx = 26 66 89 4Dh 06
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db 26h, 66h, 89h, 4Dh, 06h
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pop dx
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pop bx
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pop cx
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mov es:[di+10], bx
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mov es:[di+12], cx
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mov es:[di+14], dx
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pop ax ; saved SI
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mov es:[di+16], ax
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pop ax ; saved ES
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pop bx ; saved DS
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mov es:[di+18], bx
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mov es:[di+20], ax
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pop di
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pop si
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pop es
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pop ds
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pop bp
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xor ah, ah
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ret
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_C32_LoadNios_Probe endp
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; int C32_GetFunc_Probe(char *name, void *outbuf)
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;
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; 16-bit OMF Client32 function resolver probe.
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; This mimics C32BEGINUSE for one function name:
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; INT 2F AX=D8C1
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; save ESI as far pointer to __Nios+8 function resolver
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; push name segment
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; push name offset
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; push 0
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; push 0
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; call far [ESI]
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; add sp,8
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;
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; outbuf:
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; +00 word load AX from INT2F
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; +02 dword ESI from INT2F
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; +06 dword ECX from INT2F
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; +0A word resolver return AX
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; +0C word resolver return DX
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; +0E word BX
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; +10 word CX
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_C32_GetFunc_Probe proc far
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push bp
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mov bp, sp
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sub sp, 4
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push ds
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push es
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push si
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push di
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; clear ECX/ESI
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db 66h, 33h, 0C9h
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db 66h, 33h, 0F6h
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mov ax, 0D8C1h
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int 2Fh
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; save ESI dword to [bp-4]
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db 66h, 89h, 76h, 0FCh
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push ax ; save load AX
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; call resolver only if AX == 0
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or ax, ax
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jne c32get_store_fail
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push word ptr [bp+8] ; name segment
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push word ptr [bp+6] ; name offset
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push 0
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push 0
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call dword ptr [bp-4]
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add sp, 8
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jmp short c32get_store
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c32get_store_fail:
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xor dx, dx
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xor ax, ax
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c32get_store:
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push dx
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push ax
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les di, dword ptr [bp+10]
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pop ax ; resolver AX
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pop dx ; resolver DX
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pop bx ; load AX saved in BX temporarily
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mov es:[di+0], bx
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; Store ESI dword at out+2: ES override + operand prefix
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db 26h, 66h, 89h, 75h, 02h
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; Store ECX dword at out+6
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db 26h, 66h, 89h, 4Dh, 06h
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mov es:[di+10], ax
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mov es:[di+12], dx
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mov es:[di+14], bx
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mov es:[di+16], cx
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pop di
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pop si
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pop es
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pop ds
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mov sp, bp
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pop bp
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xor ah, ah
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ret
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_C32_GetFunc_Probe endp
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; int C32_CallName0_Probe(char *name, void *outbuf)
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;
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; Resolve Client32 function by name via NIOS resolver returned by D8C1,
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; then call resolved function with zero arguments.
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;
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; This is safe for CLIENT32GetVersion. Do not use for functions needing args.
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;
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; outbuf:
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; +00 load AX
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; +02 resolver ptr off
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; +04 resolver ptr seg
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; +06 resolved fn off
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; +08 resolved fn seg
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; +0A call return AX
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; +0C call return DX
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; +0E call return FLAGS
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_C32_CallName0_Probe proc far
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push bp
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mov bp, sp
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sub sp, 8
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push ds
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push es
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push si
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push di
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pushf
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; clear ECX/ESI
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db 66h, 33h, 0C9h
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db 66h, 33h, 0F6h
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mov ax, 0D8C1h
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int 2Fh
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; save resolver ESI at [bp-4]
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db 66h, 89h, 76h, 0FCh
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push ax ; load AX
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or ax, ax
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jne c32call_store_fail
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; resolve function name:
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; push name segment, name offset, 0, 0; call resolver; add sp,8
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push word ptr [bp+8]
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push word ptr [bp+6]
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push 0
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push 0
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call dword ptr [bp-4]
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add sp, 8
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; save resolved function pointer DX:AX at [bp-8]
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mov word ptr [bp-8], ax
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mov word ptr [bp-6], dx
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or ax, dx
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je c32call_store_fail2
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; call resolved function with zero args
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call dword ptr [bp-8]
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pushf
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push dx
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push ax
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jmp short c32call_store
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c32call_store_fail2:
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xor dx, dx
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xor ax, ax
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c32call_store_fail:
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pushf
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push dx
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push ax
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c32call_store:
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les di, dword ptr [bp+10]
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pop ax ; call AX
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pop dx ; call DX
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pop bx ; flags
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pop cx ; load AX
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mov es:[di+0], cx
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mov cx, word ptr [bp-4]
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mov es:[di+2], cx
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mov cx, word ptr [bp-2]
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mov es:[di+4], cx
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mov cx, word ptr [bp-8]
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mov es:[di+6], cx
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mov cx, word ptr [bp-6]
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mov es:[di+8], cx
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mov es:[di+10], ax
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mov es:[di+12], dx
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mov es:[di+14], bx
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popf
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pop di
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pop si
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pop es
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pop ds
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mov sp, bp
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pop bp
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xor ah, ah
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ret
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_C32_CallName0_Probe endp
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end
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