24 lines
602 B
ArmAsm
24 lines
602 B
ArmAsm
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#
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! alloca() - allocate space on the stack Author: Kees J. Bot
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! 26 Jan 1994
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#if __ACK__ /* BCC can't do alloca(), register saving is wrong. */
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.text
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.define _alloca
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_alloca:
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pop cx ! Return address
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pop ax ! Bytes to allocate
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add ax, #2*2+1 ! Add space for two saved register variables
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andb al, #0xFE ! Align
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mov bx, sp ! Keep current sp
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sub sp, ax ! Lower stack
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mov ax, sp ! Return value
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push 2(bx) ! Push what is probably the saved si
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push (bx) ! Saved di
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! Now ACK can still do:
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! pop di; pop si; mov sp, bp; pop bp; ret
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push ax ! Dummy argument
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jmp (cx)
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#endif
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