92 lines
1.7 KiB
Plaintext
92 lines
1.7 KiB
Plaintext
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#
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;
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; (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
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; See the copyright notice in the ACK home directory, in the file "Copyright".
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;
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;
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; Module: coroutine primitives
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; Author: Kees Bot, Edwin Scheffer, Ceriel Jacobs
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; Version: $Header$
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;
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; This has been taken from the ACK Modula-2 runtime system and adapted.
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;
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mes 2,EM_WSIZE,EM_PSIZE
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;
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; ___topsave: save the stack by sending it to the debugger
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;
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exp $___topsave
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pro $___topsave, 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 ; load ignore mask
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lor 0 ; load LB
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; now find the last argument base: first find the local base that has
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; dynamic link 0.
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lor 0
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1
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dup EM_PSIZE
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dch
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zer EM_PSIZE
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cmp
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zeq *2
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dch
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bra *1
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2
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lpb ; last argument base
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; Now the stuff between the current stack pointer and this argument base
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; is saved by sending it to the debugger.
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lor 1
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sbs EM_WSIZE
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loc EM_WSIZE
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adu EM_WSIZE ; gives size
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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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cal $___sendtop ; ___sendtop(char *address, char *SP, unsigned size)
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asp 4*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 $___topload
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pro $___topload, 0
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lal 0
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loi EM_PSIZE
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lxl 0
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2
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dup EM_PSIZE
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lal 0
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loi EM_PSIZE ; compare target SP with current LB to see if we must
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loi EM_PSIZE
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cmp ; find another LB first
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zgt *1
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dch ; just follow dynamic chain to make sure we find
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; a legal one
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bra *2
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1
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str 0
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str 1 ; restore SP
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lor 1
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adp -EM_PSIZE
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cal $___restoretop ; ___restoretop(char *SP)
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asp EM_PSIZE+EM_WSIZE
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str 0 ; restore local base
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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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