66 lines
1.3 KiB
Text
66 lines
1.3 KiB
Text
#
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mes 2,EM_WSIZE,EM_PSIZE
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exp $top_size
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pro $top_size, 3*EM_WSIZE+3*EM_PSIZE
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mes 11
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lal 0
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loi EM_PSIZE ; s_brk
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lor 1 ; s_brk SP
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sbs EM_PSIZE ; s_brk-SP
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ret EM_PSIZE ; return size of block to be saved
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end 3*EM_WSIZE+3*EM_PSIZE
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exp $top_save
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pro $top_save, 0
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mes 11
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loe 0
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lae 4 ; load line number and file name
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loi EM_PSIZE
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lim ; ignore mask
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lor 0 ; LB
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lal 0
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loi EM_PSIZE ; size of block
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loc EM_PSIZE
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loc EM_WSIZE
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cuu
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dup EM_WSIZE
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stl 0 ; push & store size in 2 bytes
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lor 1 ; SP (the SP BEFORE pushing)
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lor 1 ; SP (address of stack top to save)
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lal EM_PSIZE ; area
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loi EM_PSIZE
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lol 0 ; size
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bls EM_WSIZE ; move whole block
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asp 3*EM_PSIZE+3*EM_WSIZE ; remove the lot from the stack
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loc 1
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ret EM_WSIZE ; return 1
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end 0
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exp $top_load
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pro $top_load, 0
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mes 11
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lal 0
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loi EM_PSIZE
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dup EM_PSIZE
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loi EM_PSIZE
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sti EM_PSIZE ; copy pointer from argument 0 to new frame
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lal 0
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loi EM_PSIZE
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loi EM_PSIZE ; load indirect to
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str 1 ; restore SP
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dup EM_PSIZE ; givesargument 0 again
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lor 1 ; SP (the SP AFTER, see above)
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lor 1
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adp EM_PSIZE
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loi EM_PSIZE
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lof EM_PSIZE ; size of block
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bls EM_WSIZE ; move block back (SP becomes the SP BEFORE again!)
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asp EM_WSIZE ; drop size
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str 0 ; LB
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sim ; ignore mask
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lae 4
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sti EM_PSIZE
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ste 0 ; line and file
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loc 0
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ret EM_WSIZE ; return 0
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end 0
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