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91 lines
3.3 KiB
Forth
91 lines
3.3 KiB
Forth
\ ========== Copyright Header Begin ==========================================
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\
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\ Hypervisor Software File: byteload.fth
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\
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\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
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\
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\ - Do no alter or remove copyright notices
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\
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\ - Redistribution and use of this software in source and binary forms, with
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\ or without modification, are permitted provided that the following
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\ conditions are met:
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\
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\ - Redistribution of source code must retain the above copyright notice,
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\ this list of conditions and the following disclaimer.
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\
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\ - Redistribution in binary form must reproduce the above copyright notice,
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\ this list of conditions and the following disclaimer in the
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\ documentation and/or other materials provided with the distribution.
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\
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\ Neither the name of Sun Microsystems, Inc. or the names of contributors
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\ may be used to endorse or promote products derived from this software
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\ without specific prior written permission.
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\
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\ This software is provided "AS IS," without a warranty of any kind.
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\ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
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\ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
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\ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
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\ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
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\ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
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\ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
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\ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
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\ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
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\ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
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\ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
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\ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
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\
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\ You acknowledge that this software is not designed, licensed or
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\ intended for use in the design, construction, operation or maintenance of
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\ any nuclear facility.
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\
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\ ========== Copyright Header End ============================================
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purpose: Implements byte-load interface to FCode interpreter
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copyright: Copyright 1990-2001 Sun Microsystems, Inc. All Rights Reserved
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headerless
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: compile-byte ( adr immediate? -- )
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state @ 0= or if execute else compile, then
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;
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\ Interpret FCode beginning at "adr", with successive FCode bytes
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\ separated by "stride" address units. "stride" is usually 1,
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\ but may be otherwise; for example, if "stride" is 4, then the
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\ FCode interpreter will fetch every fourth byte (e.g. a byte-wide
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\ FCode PROM on a 32-bit justified bus).
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: (byte-load) ( adr stride -- )
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['] compile-byte is do-byte-compile
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depth 2- >r \ Save stack depth
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\ Interpret byte sequence
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['] byte-interpret catch ?dup if throw then
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depth r> - ?dup if
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??cr ." Warning: Fcode sequence resulted in "
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." a net stack depth change of " .d cr
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nullstring throw
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then
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;
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headers
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: byte-load ( adr stride -- )
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new-token-tables >r
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['] (byte-load) catch ?dup if ( adr stride err# )
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.error ( adr stride )
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2drop
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then
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r> old-token-tables
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;
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\ Support for FCode-encoded dropin drivers
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: execute-buffer ( adr len -- )
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over c@ dup h# f0 h# f3 between swap h# fd = or if
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drop 1 byte-load exit
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then
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execute-buffer
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;
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