159 lines
4.6 KiB
Racket
159 lines
4.6 KiB
Racket
#lang racket
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(struct mem
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(regs pc sp flags bank))
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(define (make-mem)
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(mem (make-regs)
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0
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0
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0
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(make-bank)))
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(define (make-regs)
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(make-vector 8 0))
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(define (get-reg x mem)
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(if (and (< x 8) (>= x 0))
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(let ([regs (mem-regs mem)])
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(if (not (= x 6))
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(vector-ref regs x)
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(let([bank (mem-bank mem)]
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[h (vector-ref regs 4)]
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[l (vector-ref regs 5)])
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(vector-ref bank (make-16b-addr h l)))))
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(error "unknown register index")))
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(define (set-reg x val m)
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(if (and (< x 8) (>= x 0))
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(let ([regs (mem-regs m)])
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(if (not (= x 6))
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(let ([newregs (vector-copy regs)])
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(vector-set! newregs x (mod-8bit val))
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(struct-copy mem m [regs newregs]))
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(let ([newbank (vector-copy (mem-bank m))]
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[h (vector-ref regs 4)]
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[l (vector-ref regs 5)])
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(vector-set! newbank (make-16b-addr h l) (mod-8bit val))
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(struct-copy mem m [bank newbank]))))
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(error "unknown register index")))
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(define (make-bank)
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(make-vector 65536 #x00))
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(define (mod-8bit val)
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(modulo val 256))
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(define (mod-16bit val)
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(modulo val 65536))
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(define (set-pc addr m)
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(begin
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(struct-copy mem m [pc (mod-16bit addr)])))
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(define (get-byte addr m)
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(let ([b (mem-bank m)])
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(if (and (>= addr 0)
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(< addr (vector-length b)))
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(vector-ref b addr)
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(error (format "address ~a out of bounds" addr)))))
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(define (set-byte addr val m)
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(let ([b (mem-bank m)])
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(if (and (>= addr 0)
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(< addr (vector-length b)))
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(let ([newbank (vector-copy b)])
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(vector-set! newbank addr (mod-8bit val))
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(struct-copy mem m [bank newbank]))
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(error (format "address ~a out of bounds" addr)))))
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(define (set-bytes addr bs m)
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(if (null? bs)
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m
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(set-bytes (mod-16bit (add1 addr))
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(cdr bs)
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(set-byte addr (car bs) m))))
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(define (inc-sp m)
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(struct-copy mem m [sp (add1 (mem-sp m))]))
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(define (inc-pc m)
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(struct-copy mem m [pc (add1 (mem-pc m))]))
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(define (make-16b-addr x y)
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(bitwise-ior y (arithmetic-shift x 8)))
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(define (8b-ld-reg-imm reg imm)
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(lambda (m)
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(set-reg reg imm m)))
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(define (8b-ld-reg-reg dst src)
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(lambda (m)
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(set-reg dst
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(get-reg src m)
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m)))
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(define (display-byte-hex v)
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(~a #:align 'right #:left-pad-string "0" #:width 2
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(format "~x" v)))
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(define (display-word-hex v)
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(~a #:align 'right #:left-pad-string "0" #:width 4
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(format "~x" v)))
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(define (display-bin v)
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(~a #:left-pad-string "0" #:width 8 #:align 'right
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(format "~b" v)))
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(define (print-regs m)
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(letrec ([regs (mem-regs m)]
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[F (display-byte-hex (mem-flags m))]
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[B (display-byte-hex (vector-ref regs 0))]
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[C (display-byte-hex (vector-ref regs 1))]
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[D (display-byte-hex (vector-ref regs 2))]
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[E (display-byte-hex (vector-ref regs 3))]
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[h (vector-ref regs 4)]
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[l (vector-ref regs 5)]
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[H (display-byte-hex (vector-ref regs 4))]
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[L (display-byte-hex (vector-ref regs 5))]
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[HL-ind (display-byte-hex (get-byte (make-16b-addr h l) m))]
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[A (display-byte-hex (vector-ref regs 7))])
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(displayln (format "BC: $~a~a, DE: $~a~a" B C D E))
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(displayln (format "HL: $~a~a, AF: $~a~a" H L A F))
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(displayln (format "(HL): $~a" HL-ind))
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(void)))
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(define (print-state m)
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(displayln (format "PC: $~a, SP: $~a, Flags: %~a"
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(display-byte-hex (mem-pc m))
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(display-byte-hex (mem-sp m))
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(display-bin(mem-flags m)))))
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(define (print-part-bank start count m)
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(define (print-mem v)
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(display (format " $~a" (display-byte-hex v))))
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(let ([s (display-word-hex start)]
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[e (display-word-hex (mod-16bit (+ start count)))])
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(display (format "$~a >" s))
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(let ([splice (vector-take
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(vector-drop (mem-bank m) start)
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count)])
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(vector-map print-mem splice))
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(display (format " < $~a\n" e) ))
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(void))
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(define (run-lines ls)
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(define (run-line-help ls m)
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(if (null? ls)
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m
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(run-line-help (cdr ls)
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((car ls) (inc-pc m)))))
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(let ([fin (run-line-help ls (make-mem))])
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(begin
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(print-state fin)
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(print-regs fin)
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(print-part-bank #x150 16 fin))))
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(provide (all-defined-out))
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