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| 1 | #
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| 2 | ; $Header: /cvsup/minix/src/lib/ack/libp/gto.e,v 1.1 2005/10/10 15:27:46 beng Exp $
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| 3 | ; (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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| 4 | ;
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| 5 | ; This product is part of the Amsterdam Compiler Kit.
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| 6 | ;
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| 7 | ; Permission to use, sell, duplicate or disclose this software must be
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| 8 | ; obtained in writing. Requests for such permissions may be sent to
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| 9 | ;
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| 10 | ; Dr. Andrew S. Tanenbaum
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| 11 | ; Wiskundig Seminarium
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| 12 | ; Vrije Universiteit
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| 13 | ; Postbox 7161
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| 14 | ; 1007 MC Amsterdam
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| 15 | ; The Netherlands
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| 16 | ;
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| 17 |
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| 18 | /* Author: J.W. Stevenson */
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| 19 |
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| 20 |
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| 21 | mes 2,_EM_WSIZE,_EM_PSIZE
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| 22 |
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| 23 | #define TARLB 0
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| 24 | #define DESCR _EM_PSIZE
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| 25 |
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| 26 | #define NEWPC 0
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| 27 | #define SAVSP _EM_PSIZE
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| 28 |
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| 29 | #define D_PC 0
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| 30 | #define D_SP _EM_PSIZE
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| 31 | #define D_LB _EM_PSIZE+_EM_PSIZE
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| 32 |
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| 33 | #define LOCLB 0-_EM_PSIZE
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| 34 |
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| 35 | ; _gto is called with two arguments:
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| 36 | ; - pointer to the label descriptor (DESCR)
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| 37 | ; - local base (LB) of target procedure (TARLB)
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| 38 | ; the label descriptor contains two items:
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| 39 | ; - label address i.e. new PC (NEWPC)
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| 40 | ; - offset in target procedure frame (SAVSP)
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| 41 | ; using this offset and the LB of the target procedure, the address of
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| 42 | ; of local variable of the target procedure is constructed.
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| 43 | ; the target procedure must have stored the correct target SP there.
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| 44 |
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| 45 | descr
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| 46 | bss 3*_EM_PSIZE,0,0
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| 47 |
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| 48 | exp $_gto
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| 49 | pro $_gto,_EM_PSIZE
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| 50 | lal DESCR
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| 51 | loi _EM_PSIZE
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| 52 | adp NEWPC
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| 53 | loi _EM_PSIZE
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| 54 | lae descr+D_PC
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| 55 | sti _EM_PSIZE
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| 56 | lal TARLB
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| 57 | loi _EM_PSIZE
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| 58 | zer _EM_PSIZE
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| 59 | cmp
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| 60 | zeq *1
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| 61 | lal TARLB
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| 62 | loi _EM_PSIZE
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| 63 | bra *2
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| 64 | 1
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| 65 | lae _m_lb
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| 66 | loi _EM_PSIZE
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| 67 | 2
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| 68 | lal LOCLB
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| 69 | sti _EM_PSIZE
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| 70 | lal LOCLB
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| 71 | loi _EM_PSIZE
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| 72 | lal DESCR
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| 73 | loi _EM_PSIZE
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| 74 | adp SAVSP
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| 75 | loi _EM_WSIZE ; or _EM_PSIZE ?
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| 76 | ads _EM_WSIZE ; or _EM_PSIZE ?
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| 77 | loi _EM_PSIZE
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| 78 | lae descr+D_SP
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| 79 | sti _EM_PSIZE
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| 80 | lal LOCLB
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| 81 | loi _EM_PSIZE
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| 82 | lae descr+D_LB
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| 83 | sti _EM_PSIZE
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| 84 | gto descr
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| 85 | end ?
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