43 lines
878 B
ArmAsm
43 lines
878 B
ArmAsm
.define _begsig
|
|
.sect .text; .sect .rom; .sect .data
|
|
.extern _begsig
|
|
.extern _vectab, _M
|
|
mtype = 2 ! M+mtype = &M.m_type
|
|
.sect .text
|
|
_begsig:
|
|
push ax ! after interrupt, save all regs
|
|
push bx
|
|
push cx
|
|
push dx
|
|
push si
|
|
push di
|
|
push bp
|
|
push ds
|
|
push es
|
|
mov bx,sp
|
|
mov bx,18(bx) ! bx = signal number
|
|
mov ax,bx ! ax = signal number
|
|
dec bx ! vectab[0] is for sig 1
|
|
add bx,bx ! pointers are two bytes on 8088
|
|
mov bx,_vectab(bx) ! bx = address of routine to call
|
|
push (_M+mtype) ! push status of last system call
|
|
push ax ! func called with signal number as arg
|
|
call (bx)
|
|
back:
|
|
pop ax ! get signal number off stack
|
|
pop (_M+mtype) ! restore status of previous system call
|
|
pop es ! signal handling finished
|
|
pop ds
|
|
pop bp
|
|
pop di
|
|
pop si
|
|
pop dx
|
|
pop cx
|
|
pop bx
|
|
pop ax
|
|
pop (dummy) ! remove signal number from stack
|
|
iret
|
|
|
|
.sect .data
|
|
dummy: .data2 0
|