70 lines
1.7 KiB
Forth
70 lines
1.7 KiB
Forth
\ Copyright 2022 Bradley D. Nelson
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\
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\ Licensed under the Apache License, Version 2.0 (the "License");
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\ you may not use this file except in compliance with the License.
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\ You may obtain a copy of the License at
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\
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\ http://www.apache.org/licenses/LICENSE-2.0
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\
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\ Unless required by applicable law or agreed to in writing, software
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\ distributed under the License is distributed on an "AS IS" BASIS,
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\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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\ See the License for the specific language governing permissions and
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\ limitations under the License.
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( Lazy loaded code words )
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: asm r|
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also forth definitions
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vocabulary asm
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internals definitions
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: ca! ( n a -- ) dup cell-base >r cell-shift swap over lshift
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swap 255 swap lshift invert r@ @ and or r> ! ;
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also asm definitions
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variable code-start
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variable code-at
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DEFINED? posix [IF]
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also posix
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: reserve ( n -- )
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0 swap PROT_READ PROT_WRITE PROT_EXEC or or
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MAP_ANONYMOUS MAP_PRIVATE or -1 0 mmap code-start ! ;
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previous
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4096 reserve
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[THEN]
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DEFINED? esp [IF]
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also esp
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: reserve ( n -- ) MALLOC_CAP_EXEC heap_caps_malloc code-start ! ;
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previous
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1024 reserve
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[THEN]
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code-start @ code-at !
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: chere ( -- a ) code-at @ ;
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: callot ( n -- ) code-at +! ;
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: code1, ( n -- ) chere ca! 1 callot ;
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: code2, ( n -- ) dup code1, 8 rshift code1, ;
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: code3, ( n -- ) dup code2, 16 rshift code1, ;
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: code4, ( n -- ) dup code2, 16 rshift code2, ;
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cell 8 = [IF]
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: code, dup code4, 32 rshift code4, ;
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[ELSE]
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: code, code4, ;
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[THEN]
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: end-code previous ;
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also forth definitions
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: code ( "name" ) create ['] callcode @ latestxt !
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code-at @ latestxt cell+ ! also asm ;
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previous previous previous
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asm
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| evaluate ;
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