| 1 | #
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| 2 | ;
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| 3 | ; (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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| 4 | ; See the copyright notice in the ACK home directory, in the file "Copyright".
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| 5 | ;
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| 6 |
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| 7 | ;
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| 8 | ; Module: coroutine primitives
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| 9 | ; Author: Kees Bot, Edwin Scheffer, Ceriel Jacobs
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| 10 | ; Version: $Header: /cvsup/minix/src/lib/ack/libm2/par_misc.e,v 1.1 2005/10/10 15:27:46 beng Exp $
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| 11 | ;
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| 12 |
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| 13 | mes 2,_EM_WSIZE,_EM_PSIZE
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| 14 |
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| 15 | ; topsize takes care of two things:
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| 16 | ; - given a stack-break,
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| 17 | ; it computes the size of the chunk of memory needed to save the stack;
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| 18 | ; - also, if this stack-break = 0, it creates one, assuming that caller is
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| 19 | ; the stack-break.
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| 20 | ;
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| 21 | ; This implementation assumes a continuous stack growing downwards
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| 22 |
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| 23 | exp $topsize
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| 24 | #ifdef __sparc
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| 25 | inp $topsize2
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| 26 | pro $topsize, 0
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| 27 | mes 11
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| 28 | zer _EM_PSIZE
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| 29 | lal 0
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| 30 | loi _EM_PSIZE
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| 31 | cal $topsize2
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| 32 | asp 2*_EM_PSIZE
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| 33 | lfr _EM_WSIZE
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| 34 | ret _EM_WSIZE
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| 35 | end 0
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| 36 | pro $topsize2, (3*_EM_WSIZE+3*_EM_PSIZE)
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| 37 | #else
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| 38 | pro $topsize, (3*_EM_WSIZE+3*_EM_PSIZE)
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| 39 | #endif
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| 40 | ; local space for line-number, ignoremask, filename, stack-break, size,
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| 41 | ; and stack-pointer (see the topsave routine)
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| 42 | mes 11
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| 43 | lal 0
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| 44 | loi _EM_PSIZE
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| 45 | loi _EM_PSIZE ; stack-break or 0
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| 46 | zer _EM_PSIZE
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| 47 | cmp
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| 48 | zne *1
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| 49 | lxl 0
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| 50 | dch ; local base of caller
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| 51 | #ifdef __sparc
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| 52 | dch ; because of the extra layer
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| 53 | #endif
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| 54 | lal 0
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| 55 | loi _EM_PSIZE
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| 56 | sti _EM_PSIZE
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| 57 | 1
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| 58 | lal 0
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| 59 | loi _EM_PSIZE
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| 60 | loi _EM_PSIZE
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| 61 | lpb ; convert this local base to an argument base.
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| 62 | ; An implementation of a sort of "topsize" EM
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| 63 | ; instruction should take a local base, and save
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| 64 | ; the whole frame.
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| 65 |
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| 66 | lor 1 ; stack-break SP
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| 67 | sbs _EM_WSIZE ; stack-break-SP
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| 68 | ret _EM_WSIZE ; return size of block to be saved
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| 69 | end 3*_EM_WSIZE+3*_EM_PSIZE
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| 70 |
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| 71 | exp $topsave
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| 72 | #ifdef __sparc
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| 73 | inp $topsave2
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| 74 | pro $topsave,0
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| 75 | mes 11
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| 76 | lal 0
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| 77 | loi 2*_EM_PSIZE
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| 78 | cal $topsave2
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| 79 | asp 2*_EM_PSIZE
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| 80 | lfr _EM_WSIZE
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| 81 | ret _EM_WSIZE
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| 82 | end 0
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| 83 | pro $topsave2,0
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| 84 | #else
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| 85 | pro $topsave, 0
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| 86 | #endif
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| 87 | mes 11
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| 88 | loe 0
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| 89 | lae 4 ; load line number and file name
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| 90 | loi _EM_PSIZE
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| 91 | lim ; ignore mask
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| 92 | lor 0 ; LB
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| 93 | lal 0
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| 94 | loi _EM_PSIZE ; stack-break
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| 95 | lpb
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| 96 | lor 1
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| 97 | sbs _EM_WSIZE
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| 98 | loc _EM_WSIZE
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| 99 | adu _EM_WSIZE ; gives size
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| 100 | dup _EM_WSIZE
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| 101 | stl 0 ; save size
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| 102 | lor 1 ; SP (the SP BEFORE pushing)
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| 103 | lor 1 ; SP (address of stack top to save)
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| 104 | lal _EM_PSIZE ; area
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| 105 | loi _EM_PSIZE
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| 106 | lol 0 ; size
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| 107 | bls _EM_WSIZE ; move whole block
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| 108 | asp 3*_EM_PSIZE+3*_EM_WSIZE ; remove the lot from the stack
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| 109 | loc 1
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| 110 | ret _EM_WSIZE ; return 1
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| 111 | end 0
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| 112 |
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| 113 | sv
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| 114 | bss _EM_PSIZE,0,0
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| 115 |
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| 116 | exp $topload
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| 117 | #ifdef __sparc
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| 118 | inp $topload1
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| 119 | pro $topload,0
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| 120 | lal 0
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| 121 | loi _EM_PSIZE
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| 122 | cal $topload1
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| 123 | asp _EM_PSIZE
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| 124 | lfr _EM_WSIZE
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| 125 | ret _EM_WSIZE
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| 126 | end 0
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| 127 | pro $topload1, 0
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| 128 | #else
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| 129 | pro $topload, 0
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| 130 | #endif
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| 131 | mes 11
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| 132 |
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| 133 | lal 0
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| 134 | loi _EM_PSIZE
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| 135 | lae sv
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| 136 | sti _EM_PSIZE ; saved parameter
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| 137 |
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| 138 | lxl 0
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| 139 | 2
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| 140 | dup _EM_PSIZE
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| 141 | adp -3*_EM_PSIZE
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| 142 | lal 0
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| 143 | loi _EM_PSIZE ; compare target SP with current LB to see if we must
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| 144 | loi _EM_PSIZE
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| 145 | cmp ; find another LB first
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| 146 | zgt *1
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| 147 | dch ; just follow dynamic chain to make sure we find
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| 148 | ; a legal one
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| 149 | bra *2
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| 150 | 1
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| 151 | str 0
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| 152 |
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| 153 | lae sv
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| 154 | loi _EM_PSIZE
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| 155 | loi _EM_PSIZE ; load indirect to
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| 156 | str 1 ; restore SP
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| 157 | asp 0-_EM_PSIZE ; to stop int from complaining about non-existent memory
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| 158 | lae sv
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| 159 | loi _EM_PSIZE ; source address
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| 160 | lor 1
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| 161 | adp _EM_PSIZE ; destination address
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| 162 | lae sv
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| 163 | loi _EM_PSIZE
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| 164 | adp _EM_PSIZE
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| 165 | loi _EM_WSIZE ; size of block
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| 166 | bls _EM_WSIZE
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| 167 | asp _EM_PSIZE+_EM_WSIZE ; drop size + SP
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| 168 | str 0 ; restore local base
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| 169 | sim ; ignore mask
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| 170 | lae 4
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| 171 | sti _EM_PSIZE
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| 172 | ste 0 ; line and file
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| 173 | loc 0
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| 174 | ret _EM_WSIZE
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| 175 | end 0
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