2007-02-20 00:25:12 +00:00
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#
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! $Source$
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! $State$
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2007-02-20 00:31:54 +00:00
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! $Revision$
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2007-02-20 00:25:12 +00:00
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! Declare segments (the order is important).
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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! This file contains the code necessary to extend the ACK heap. This is called
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! by a i86/libem helper function called .strhp, which takes care of updating
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! some magic global variables --- defined here.
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! Pointer to the current top of the heap.
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.sect .data
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.define .reghp
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.reghp:
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.data2 endbss
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! Pointer to the current top of memory.
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.sect .data
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.define .limhp
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.limhp:
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.data2 endbss
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! Claims more memory from the system, but does not actually change those
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! global variables (.strhp does that). This does not use the C calling
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! convention!
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!
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! Stack: ( desired_limhp : actual_limhp )
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! Also returns: ax = -1 on failure
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.sect .text
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.define BRK
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BRK:
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pop bx ! holds return address
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pop ax ! holds desired limhp
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cmp ax, sp ! compare sp with si
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jae fail ! si too big? (Overlaps stack?)
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cmp ax, endbss ! compare with bottom of heap
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jb fail ! si too small? (Overlaps bss?)
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return:
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push ax ! success
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jmp bx
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fail:
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mov ax, -1
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jmp return
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