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33 lines
757 B
ArmAsm
33 lines
757 B
ArmAsm
*
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* _salloc function.
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*
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* This function allocates a data area on the stack.
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*
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* Calling Sequence:
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*
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* adr = _salloc(size);
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*
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* Returns the address of the area allocated.
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*
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* Pulled out of 'w.s' 1/84 whf
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* Fixed 2/84 sw
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*
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.globl __salloc
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__salloc:
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move.l (sp)+,a0 * Save return address
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clr.l d0 * Zap d0 high word
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move.w (sp)+,d0 * Get arg (word size)
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addq.l #1+4,d0 * Round
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bclr.l #0,d0 * up to word
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move.l __break,a1 * a1 -> break area
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lea $100(a1),a1 * Add chicken factor
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lea 0(a1,d0.l),a1 * And size
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cmpa.l a1,sp * OK?
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bhi ok *sw Overflow, die
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jmp __sovf *sw Jump to error in s.o
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ok: sub.l d0,sp * allocate
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lea 4(sp),a1 * a1 -> area start
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move.l a1,d0 * set return code
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jmp (a0) * and "return"
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*
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