X-Git-Url: http://matita.cs.unibo.it/gitweb/?p=helm.git;a=blobdiff_plain;f=matita%2Fcontribs%2Fassembly%2Ffreescale%2Fword16.ma;fp=matita%2Fcontribs%2Fassembly%2Ffreescale%2Fword16.ma;h=98d7703b636db370c1b85225f423986b4c3379d2;hp=0000000000000000000000000000000000000000;hb=f61af501fb4608cc4fb062a0864c774e677f0d76;hpb=58ae1809c352e71e7b5530dc41e2bfc834e1aef1

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+(**************************************************************************)
+(*       ___                                                              *)
+(*      ||M||                                                             *)
+(*      ||A||       A project by Andrea Asperti                           *)
+(*      ||T||                                                             *)
+(*      ||I||       Developers:                                           *)
+(*      ||T||         The HELM team.                                      *)
+(*      ||A||         http://helm.cs.unibo.it                             *)
+(*      \   /                                                             *)
+(*       \ /        This file is distributed under the terms of the       *)
+(*        v         GNU General Public License Version 2                  *)
+(*                                                                        *)
+(**************************************************************************)
+
+(* ********************************************************************** *)
+(*                           Progetto FreeScale                           *)
+(*                                                                        *)
+(* Sviluppato da:                                                         *)
+(*   Cosimo Oliboni, oliboni@cs.unibo.it                                  *)
+(*                                                                        *)
+(* Questo materiale fa parte della tesi:                                  *)
+(*   "Formalizzazione Interattiva dei Microcontroller a 8bit FreeScale"   *)
+(*                                                                        *)
+(*                    data ultima modifica 15/11/2007                     *)
+(* ********************************************************************** *)
+
+include "freescale/byte8.ma".
+
+(* ********************** *)
+(* DEFINIZIONE DELLE WORD *)
+(* ********************** *)
+
+record word16 : Type ≝
+ {
+ w16h: byte8;
+ w16l: byte8
+ }.
+
+(* \langle \rangle *)
+notation "〈x:y〉" non associative with precedence 80
+ for @{ 'mk_word16 $x $y }.
+interpretation "mk_word16" 'mk_word16 x y = 
+ (cic:/matita/freescale/word16/word16.ind#xpointer(1/1/1) x y).
+
+(* operatore = *)
+definition eq_w16 ≝ λw1,w2.(eq_b8 (w16h w1) (w16h w2)) ⊗ (eq_b8 (w16l w1) (w16l w2)).
+
+(* operatore < *)
+definition lt_w16 ≝
+λw1,w2:word16.match lt_b8 (w16h w1) (w16h w2) with
+ [ true ⇒ true
+ | false ⇒ match gt_b8 (w16h w1) (w16h w2) with
+  [ true ⇒ false
+  | false ⇒ lt_b8 (w16l w1) (w16l w2) ]].
+
+(* operatore ≤ *)
+definition le_w16 ≝ λw1,w2:word16.(eq_w16 w1 w2) ⊕ (lt_w16 w1 w2).
+
+(* operatore > *)
+definition gt_w16 ≝ λw1,w2:word16.⊖ (le_w16 w1 w2).
+
+(* operatore ≥ *)
+definition ge_w16 ≝ λw1,w2:word16.⊖ (lt_w16 w1 w2).
+
+(* operatore and *)
+definition and_w16 ≝
+λw1,w2:word16.mk_word16 (and_b8 (w16h w1) (w16h w2)) (and_b8 (w16l w1) (w16l w2)).
+
+(* operatore or *)
+definition or_w16 ≝
+λw1,w2:word16.mk_word16 (or_b8 (w16h w1) (w16h w2)) (or_b8 (w16l w1) (w16l w2)).
+
+(* operatore xor *)
+definition xor_w16 ≝
+λw1,w2:word16.mk_word16 (xor_b8 (w16h w1) (w16h w2)) (xor_b8 (w16l w1) (w16l w2)).
+
+(* operatore rotazione destra con carry *)
+definition rcr_w16 ≝
+λw:word16.λc:bool.match rcr_b8 (w16h w) c with
+ [ pair wh' c' ⇒ match rcr_b8 (w16l w) c' with
+  [ pair wl' c'' ⇒ pair ?? (mk_word16 wh' wl') c'' ]]. 
+
+(* operatore shift destro *)
+definition shr_w16 ≝
+λw:word16.match rcr_b8 (w16h w) false with
+ [ pair wh' c' ⇒ match rcr_b8 (w16l w) c' with
+  [ pair wl' c'' ⇒ pair ?? (mk_word16 wh' wl') c'' ]].
+
+(* operatore rotazione destra *)
+definition ror_w16 ≝
+λw:word16.match rcr_b8 (w16h w) false with
+ [ pair wh' c' ⇒ match rcr_b8 (w16l w) c' with
+  [ pair wl' c'' ⇒ match c'' with
+   [ true ⇒ mk_word16 (or_b8 (mk_byte8 x8 x0) wh') wl'
+   | false ⇒ mk_word16 wh' wl' ]]].
+
+(* operatore rotazione destra n-volte *)
+let rec ror_w16_n (w:word16) (n:nat) on n ≝
+ match n with
+  [ O ⇒ w
+  | S n' ⇒ ror_w16_n (ror_w16 w) n' ].
+
+(* operatore rotazione sinistra con carry *)
+definition rcl_w16 ≝
+λw:word16.λc:bool.match rcl_b8 (w16l w) c with
+ [ pair wl' c' ⇒ match rcl_b8 (w16h w) c' with
+  [ pair wh' c'' ⇒ pair ?? (mk_word16 wh' wl') c'' ]]. 
+
+(* operatore shift sinistro *)
+definition shl_w16 ≝
+λw:word16.match rcl_b8 (w16l w) false with
+ [ pair wl' c' ⇒ match rcl_b8 (w16h w) c' with
+  [ pair wh' c'' ⇒ pair ?? (mk_word16 wh' wl') c'' ]].
+
+(* operatore rotazione sinistra *)
+definition rol_w16 ≝
+λw:word16.match rcl_b8 (w16l w) false with
+ [ pair wl' c' ⇒ match rcl_b8 (w16h w) c' with
+  [ pair wh' c'' ⇒ match c'' with
+   [ true ⇒ mk_word16 wh' (or_b8 (mk_byte8 x0 x1) wl')
+   | false ⇒ mk_word16 wh' wl' ]]].
+
+(* operatore rotazione sinistra n-volte *)
+let rec rol_w16_n (w:word16) (n:nat) on n ≝
+ match n with
+  [ O ⇒ w
+  | S n' ⇒ rol_w16_n (rol_w16 w) n' ].
+
+(* operatore not/complemento a 1 *)
+definition not_w16 ≝
+λw:word16.mk_word16 (not_b8 (w16h w)) (not_b8 (w16l w)).
+
+(* operatore somma con carry *)
+definition plus_w16 ≝
+λw1,w2:word16.λc:bool.
+ match plus_b8 (w16l w1) (w16l w2) c with
+  [ pair l c' ⇒ match plus_b8 (w16h w1) (w16h w2) c' with
+   [ pair h c'' ⇒ pair ?? (mk_word16 h l) c'' ]].
+
+(* operatore somma senza carry *)
+definition plus_w16nc ≝
+λw1,w2:word16.fst ?? (plus_w16 w1 w2 false).
+
+(* operatore carry della somma *)
+definition plus_w16c ≝
+λw1,w2:word16.snd ?? (plus_w16 w1 w2 false).
+
+(* operatore Most Significant Bit *)
+definition MSB_w16 ≝ λw:word16.eq_ex x8 (and_ex x8 (b8h (w16h w))).
+
+(* word → naturali *)
+definition nat_of_word16 ≝ λw:word16. 256 * (w16h w) + (nat_of_byte8 (w16l w)).
+
+coercion cic:/matita/freescale/word16/nat_of_word16.con.
+
+(* naturali → word *)
+definition word16_of_nat ≝
+ λn.mk_word16 (byte8_of_nat (n / 256)) (byte8_of_nat n).
+
+(* operatore predecessore *)
+definition pred_w16 ≝
+λw:word16.match eq_b8 (w16l w) (mk_byte8 x0 x0) with
+ [ true ⇒ mk_word16 (pred_b8 (w16h w)) (pred_b8 (w16l w))
+ | false ⇒ mk_word16 (w16h w) (pred_b8 (w16l w)) ].
+
+(* operatore successore *)
+definition succ_w16 ≝
+λw:word16.match eq_b8 (w16l w) (mk_byte8 xF xF) with
+ [ true ⇒ mk_word16 (succ_b8 (w16h w)) (succ_b8 (w16l w))
+ | false ⇒ mk_word16 (w16h w) (succ_b8 (w16l w)) ].
+
+(* operatore neg/complemento a 2 *)
+definition compl_w16 ≝
+λw:word16.match MSB_w16 w with
+ [ true ⇒ succ_w16 (not_w16 w)
+ | false ⇒ not_w16 (pred_w16 w) ].
+
+(* 
+   operatore moltiplicazione senza segno: b*b=[0x0000,0xFE01]
+   ... in pratica (〈a,b〉*〈c,d〉) = (a*c)<<8+(a*d)<<4+(b*c)<<4+(b*d)
+*)
+definition mul_b8 ≝
+λb1,b2:byte8.match b1 with
+[ mk_byte8 b1h b1l ⇒ match b2 with
+[ mk_byte8 b2h b2l ⇒ match mul_ex b1l b2l with
+[ mk_byte8 t1_h t1_l ⇒ match mul_ex b1h b2l with
+[ mk_byte8 t2_h t2_l ⇒ match mul_ex b2h b1l with
+[ mk_byte8 t3_h t3_l ⇒ match mul_ex b1h b2h with
+[ mk_byte8 t4_h t4_l ⇒
+ plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉
+]]]]]].
+
+(* divisione senza segno (secondo la logica delle ALU): (quoziente resto) overflow *)
+definition div_b8 ≝
+λw:word16.λb:byte8.match eq_b8 b 〈x0,x0〉 with
+(* 
+   la combinazione n/0 e' illegale, segnala solo overflow senza dare risultato
+*)
+ [ true ⇒ tripleT ??? 〈xF,xF〉 (w16l w) true
+ | false ⇒ match eq_w16 w 〈〈x0,x0〉:〈x0,x0〉〉 with
+(* 0 diviso qualsiasi cosa diverso da 0 da' q=0 r=0 o=false *)
+  [ true ⇒ tripleT ??? 〈x0,x0〉 〈x0,x0〉 false
+(* 1) e' una divisione sensata che produrra' overflow/risultato *)
+(* 2) parametri: dividendo, divisore, moltiplicatore, quoziente, contatore *)
+(* 3) ad ogni ciclo il divisore e il moltiplicatore vengono scalati di 1 a dx *)
+(* 4) il moltiplicatore e' la quantita' aggiunta al quoziente se il divisore *)
+(*    puo' essere sottratto al dividendo *) 
+  | false ⇒ let rec aux (divd:word16) (divs:word16) (molt:byte8) (q:byte8) (c:nat) on c ≝
+  let w' ≝ plus_w16nc divd (compl_w16 divs) in
+   match c with
+   [ O ⇒ match le_w16 divs divd with
+    [ true ⇒ tripleT ??? (or_b8 molt q) (w16l w') (⊖ (eq_b8 (w16h w') 〈x0,x0〉))
+    | false ⇒ tripleT ??? q (w16l divd) (⊖ (eq_b8 (w16h divd) 〈x0,x0〉)) ]
+   | S c' ⇒ match le_w16 divs divd with
+    [ true ⇒ aux w' (ror_w16 divs) (ror_b8 molt) (or_b8 molt q) c'
+    | false ⇒ aux divd (ror_w16 divs) (ror_b8 molt) q c' ]]
+  in aux w (rol_w16_n 〈〈x0,x0〉:b〉 7) 〈x8,x0〉 〈x0,x0〉 7 ]].
+
+(* operatore x in [inf,sup] *)
+definition in_range ≝
+λx,inf,sup:word16.(le_w16 inf sup) ⊗ (ge_w16 x inf) ⊗ (le_w16 x sup).
+
+(* iteratore sulle word *)
+definition forall_word16 ≝
+ λP.
+  forall_byte8 (λbh.
+  forall_byte8 (λbl.
+   P (mk_word16 bh bl ))).
+
+(* ********************** *)
+(* TEOREMI/LEMMMI/ASSIOMI *)
+(* ********************** *)
+
+(* TODO: dimostrare diversamente *)
+axiom word16_of_nat_nat_of_word16: ∀b. word16_of_nat (nat_of_word16 b) = b.
+
+(* TODO: dimostrare diversamente *)
+axiom lt_nat_of_word16_65536: ∀b. nat_of_word16 b < (256 * 256).
+
+(* TODO: dimostrare diversamente *)
+axiom nat_of_word16_word16_of_nat: ∀n. nat_of_word16 (word16_of_nat n) = n \mod (256 * 256).
+
+(* TODO: dimostrare diversamente *)
+axiom eq_nat_of_word16_n_nat_of_word16_mod_n_65536:
+ ∀n. word16_of_nat n = word16_of_nat (n \mod (256 * 256)).
+
+lemma plusw16_ok:
+ ∀b1,b2,c.
+  match plus_w16 b1 b2 c with
+   [ pair r c' ⇒ b1 + b2 + nat_of_bool c = nat_of_word16 r + nat_of_bool c' * (256 * 256)
+   ].
+ intros; elim daemon.
+qed.
+
+(* TODO: dimostrare diversamente *)
+axiom plusw16_O_x:
+ ∀b. plus_w16 (mk_word16 (mk_byte8 x0 x0) (mk_byte8 x0 x0)) b false = pair ?? b false.
+
+lemma plusw16nc_O_x:
+ ∀x. plus_w16nc (mk_word16 (mk_byte8 x0 x0) (mk_byte8 x0 x0)) x = x.
+ intros;
+ unfold plus_w16nc;
+ rewrite > plusw16_O_x;
+ reflexivity.
+qed.
+
+(* TODO: dimostrare diversamente *)
+axiom eq_nat_of_word16_mod: ∀b. nat_of_word16 b = nat_of_word16 b \mod (256 * 256).
+
+(* TODO: dimostrare diversamente *)
+axiom plusw16nc_ok:
+ ∀b1,b2:word16. nat_of_word16 (plus_w16nc b1 b2) = (b1 + b2) \mod (256 * 256).
+
+(* TODO: dimostrare diversamente *)
+axiom eq_eqw16_x0_x0_x0_x0_word16_of_nat_S_false:
+ ∀b. b < (256 * 256 - 1) → eq_w16 (mk_word16 (mk_byte8 x0 x0) (mk_byte8 x0 x0)) (word16_of_nat (S b)) = false.
+
+axiom eq_mod_O_to_exists: ∀n,m. n \mod m = 0 → ∃z. n = z*m.
+
+(* TODO: dimostrare diversamente *)
+axiom eq_w16pred_S_a_a:
+ ∀a. a < (256 * 256 - 1) → pred_w16 (word16_of_nat (S a)) = word16_of_nat a.
+
+(* TODO: dimostrare diversamente *)
+axiom plusw16nc_S:
+ ∀x:word16.∀n.plus_w16nc (word16_of_nat (x*n)) x = word16_of_nat (x * S n).
+
+(* TODO: dimostrare diversamente *)
+axiom eq_plusw16c_x0_x0_x0_x0_x_false:
+ ∀x.plus_w16c (mk_word16 (mk_byte8 x0 x0) (mk_byte8 x0 x0)) x = false.
+
+(* TODO: dimostrare diversamente *)
+axiom eqw16_true_to_eq: ∀b,b'. eq_w16 b b' = true → b=b'.
+
+(* TODO: dimostrare diversamente *)
+axiom eqw16_false_to_not_eq: ∀b,b'. eq_w16 b b' = false → b ≠ b'.
+
+(* TODO: dimostrare diversamente *)
+axiom word16_of_nat_mod: ∀n.word16_of_nat n = word16_of_nat (n \mod (256 * 256)).
+
+(* nuovi *)
+
+(*
+lemma ok_mul_b8: ∀b1,b2:byte8. nat_of_word16 (mul_b8 b1 b2) = b1 * b2.
+ intros;
+ cases b1 (b1h b1l);
+ cases b2 (b2h b2l);
+ change in ⊢ (? ? (? %) ?) with
+  (match mul_ex b1l b2l with
+[ mk_byte8 t1_h t1_l ⇒ match mul_ex b1h b2l with
+[ mk_byte8 t2_h t2_l ⇒ match mul_ex b2h b1l with
+[ mk_byte8 t3_h t3_l ⇒ match mul_ex b1h b2h with
+[ mk_byte8 t4_h t4_l ⇒
+ plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉
+]]]]);
+ lapply (ok_mul_ex b1l b2l) as ll;
+ lapply (ok_mul_ex b1h b2l) as hl;
+ lapply (ok_mul_ex b2h b1l) as lh;
+ lapply (ok_mul_ex b1h b2h) as hh;
+ elim (mul_ex b1l b2l) (t1_h t1_l);
+ change in ⊢ (? ? (? %) ?) with
+  (match mul_ex b1h b2l with
+[ mk_byte8 t2_h t2_l ⇒ match mul_ex b2h b1l with
+[ mk_byte8 t3_h t3_l ⇒ match mul_ex b1h b2h with
+[ mk_byte8 t4_h t4_l ⇒
+ plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉
+]]]);
+ elim (mul_ex b1h b2l) (t2_h t2_l);
+ change in ⊢ (? ? (? %) ?) with
+  (match mul_ex b2h b1l with
+[ mk_byte8 t3_h t3_l ⇒ match mul_ex b1h b2h with
+[ mk_byte8 t4_h t4_l ⇒
+ plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉
+]]);
+ elim (mul_ex b2h b1l) (t3_h t3_l);
+ change in ⊢ (? ? (? %) ?) with
+  (match mul_ex b1h b2h with
+[ mk_byte8 t4_h t4_l ⇒
+ plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉
+]);
+ elim (mul_ex b1h b2h) (t4_h t4_l);
+ change in ⊢ (? ? (? %) ?) with
+  (plus_w16nc
+  (plus_w16nc
+   (plus_w16nc 〈〈t4_h,t4_l〉:〈x0,x0〉〉 〈〈x0,t3_h〉:〈t3_l,x0〉〉) 〈〈x0,t2_h〉:〈t2_l,x0〉〉)〈〈x0,x0〉:〈t1_h,t1_l〉〉);
+ do 3 (rewrite > plusw16nc_ok);
+ unfold nat_of_word16;
+ unfold nat_of_byte8;
+simplify in ⊢ (? ? (? (? (? (? (? (? (? (? ? (? (? ? (? (? %))) ?)) ?) ?) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? (? ? (? (? ? (? (? %))) ?)) ?) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? (? ? (? ? (? (? %)))) ?) ?) ?) ?) ?) ?) ?);
+whd in ⊢ (? ? (? (? (? (? (? (? (? ? (? ? %)) ?) ?) ?) ?) ?) ?) ?);
+whd in ⊢ (? ? (? (? (? (? (? (? (? ? %) ?) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? (? ? (? (? ? (? %)) ?)) ?)) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? (? ? (? ? (? (? %)))) ?)) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? (? ? (? ? %)) ?)) ?) ?);
+whd in ⊢ (? ? (? (? ? (? % ?)) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? ? (? (? ? (? (? %))) ?))) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? ? (? ? (? (? %))))) ?) ?);
+simplify in ⊢ (? ? ? (? (? (? ? (? %)) ?) ?));
+simplify in ⊢ (? ? ? (? (? ? (? %)) ?));
+simplify in ⊢ (? ? ? (? ? (? (? ? (? %)) ?)));
+simplify in ⊢ (? ? ? (? ? (? ? (? %))));
+simplify in ⊢ (? ? (? (? ? (? ? (? (? ? (? %)) ?))) ?) ?);
+simplify in ⊢ (? ? (? (? ? (? ? (? ? (? %)))) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? ? (? ? (? %)))) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? ? (? (? ? (? %)) ?))) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? (? ? (? ? (? %))) ?)) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? (? ? (? (? ? (? %)) ?)) ?)) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? ? (? ? (? %)))) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? (? ? (? ? (? %))) ?)) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? (? (? ? (? (? ? (? %)) ?)) ?) ?) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? (? (? ? (? ? (? %))) ?) ?) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? ? (? (? ? (? %)) ?))) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? (? ? (? (? ? (? %)) ?)) ?)) ?) ?) ?) ?) ?) ?);
+rewrite < plus_n_O;
+change in ⊢ (? ? (? (? ? %) ?) ?) with (16*nat_of_exadecim t1_h+nat_of_exadecim t1_l);
+unfold nat_of_byte8 in H H1 H2 H3;
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? (? ? (? (? ? %) ?)) ?)) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? ? (? ? %))) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? (? ? (? (? ? %) ?)) ?)) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? ? (? ? %))) ?) ?) ?) ?);
+rewrite < plus_n_O;
+rewrite < plus_n_O;
+simplify in ⊢ (? ? (? (? (? (? (? (? ? (? (? ? %) ?)) ?) ?) ?) ?) ?) ?);
+simplify in ⊢ (? ? (? (? (? (? ? (? (? ? %) ?)) ?) ?) ?) ?);
+elim daemon.
+qed.
+*)