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