source: src/LIN/joint_LTL_LIN_semantics.ma @ 3037

Last change on this file since 3037 was 3037, checked in by tranquil, 7 years ago
  • ADDRESS joint instruction now has also an offset
  • corrected call to pointer (needed to clear the accumulator)
  • now we make sure globals contain also function names

LINToASM will be fixed in an upcoming commit

File size: 4.1 KB
Line 
1include "LIN/joint_LTL_LIN.ma".
2include "joint/semanticsUtils.ma".
3
4definition hw_reg_store ≝ λr,v,e. OK … (hwreg_store r v e).
5definition hw_reg_retrieve ≝ λl,r. OK … (hwreg_retrieve l r).
6definition hw_arg_retrieve ≝
7  λl,a.match a with
8  [ Reg r ⇒ hw_reg_retrieve l r
9  | Imm b ⇒ OK … (BVByte b)
10  ].
11
12definition eval_registers_move ≝ λe,m.
13match m with
14[ from_acc r _ ⇒
15  hw_reg_store r (hwreg_retrieve e RegisterA) e
16| to_acc _ r ⇒
17  hw_reg_store RegisterA (hwreg_retrieve e r) e
18| int_to_reg r v ⇒
19  hw_reg_store r (BVByte v) e
20| int_to_acc _ v ⇒
21  hw_reg_store RegisterA (BVByte v) e
22].
23
24definition LTL_LIN_state : sem_state_params ≝
25  mk_sem_state_params
26 (* framesT ≝ *) unit
27 (* empty_framesT ≝ *) it
28 (* regsT ≝ *) hw_register_env
29 (* empty_regsT ≝ *) init_hw_register_env
30 (* load_sp ≝ *) hwreg_retrieve_sp
31 (* store_sp ≝ *) hwreg_store_sp.
32
33(*CSC: XXXX, for external functions only*)
34axiom ltl_lin_fetch_external_args: external_function → state LTL_LIN_state → ℕ → res (list val).
35axiom ltl_lin_set_result: list val → unit → state LTL_LIN_state → res (state LTL_LIN_state).
36
37definition LTL_LIN_save_frame :
38call_kind → unit → state_pc LTL_LIN_state → res(state LTL_LIN_state) ≝
39λk.λ_.λst. match k with
40[ PTR ⇒
41  ! v ← Byte_of_val BadFunction
42    (hwreg_retrieve (regs … st) RegisterA) ;
43  if eq_bv … v (bv_zero …) then return (st_no_pc … st)
44  else Error … [MSG BadFunction; MSG BadPointer]
45| ID ⇒ push_ra … st (pc … st)
46].
47
48definition eval_LTL_LIN_ext_seq :
49 ∀F.∀globals.∀ge : genv_gen F globals.ltl_lin_seq → ident → state LTL_LIN_state → res (state LTL_LIN_state) ≝
50λF,globals,ge,s,curr_id,st.
51match s with
52[ SAVE_CARRY ⇒
53  let regs ≝ hwreg_set_other … (carry … st) (regs … st) in
54  return set_regs LTL_LIN_state regs st
55| RESTORE_CARRY ⇒
56  let carry ≝ other_bit (regs … st) in
57  return set_carry LTL_LIN_state carry st
58| LOW_ADDRESS l ⇒  ! pc_lab ← gen_pc_from_label … ge curr_id l;
59                    let 〈addrl,addrh〉 ≝ beval_pair_of_pc pc_lab in
60                    let regs ≝ hwreg_store RegisterA addrl (regs … st) in
61                    return set_regs LTL_LIN_state regs st
62| HIGH_ADDRESS l ⇒ ! pc_lab ← gen_pc_from_label … ge curr_id l;
63                    let 〈addrl,addrh〉 ≝  beval_pair_of_pc pc_lab in
64                    let regs ≝ hwreg_store RegisterA addrh (regs … st) in
65                    return set_regs LTL_LIN_state regs st
66].
67
68definition LTL_LIN_semantics ≝
69  λF.mk_sem_unserialized_params LTL_LIN F
70  (* st_pars            ≝ *) LTL_LIN_state
71  (* acca_store_        ≝ *) (λ_.hw_reg_store RegisterA)
72  (* acca_retrieve_     ≝ *) (λe.λ_.hw_reg_retrieve e RegisterA)
73  (* acca_arg_retrieve_ ≝ *) (λe.λ_.hw_reg_retrieve e RegisterA)
74  (* accb_store_        ≝ *) (λ_.hw_reg_store RegisterB)
75  (* accb_retrieve_     ≝ *) (λe.λ_.hw_reg_retrieve e RegisterB)
76  (* accb_arg_retrieve_ ≝ *) (λe.λ_.hw_reg_retrieve e RegisterB)
77  (* dpl_store_         ≝ *) (λ_.hw_reg_store RegisterDPL)
78  (* dpl_retrieve_      ≝ *) (λe.λ_.hw_reg_retrieve e RegisterDPL)
79  (* dpl_arg_retrieve_  ≝ *) (λe.λ_.hw_reg_retrieve e RegisterDPL)
80  (* dph_store_         ≝ *) (λ_.hw_reg_store RegisterDPH)
81  (* dph_retrieve_      ≝ *) (λe.λ_.hw_reg_retrieve e RegisterDPH)
82  (* dph_arg_retrieve_  ≝ *) (λe.λ_.hw_reg_retrieve e RegisterDPH)
83  (* snd_arg_retrieve_  ≝ *) hw_arg_retrieve
84  (* pair_reg_move_     ≝ *) eval_registers_move
85(*  (* fetch_ra           ≝ *) (load_ra …)
86  (* allocate_local     ≝ *) (λabs.match abs in void with [ ])
87*)  (* save_frame         ≝ *) LTL_LIN_save_frame
88  (* setup_call         ≝ *) (λ_.λ_.λ_.λst.return st)
89  (* fetch_external_args≝ *) ltl_lin_fetch_external_args
90  (* set_result         ≝ *) ltl_lin_set_result
91  (* call_args_for_main ≝ *) 0
92  (* call_dest_for_main ≝ *) it
93  (* read_result        ≝ *) (λ_.λ_.λ_.
94  λst.return map … (hwreg_retrieve (regs … st)) RegisterRets)
95  (* eval_ext_seq       ≝ *) (eval_LTL_LIN_ext_seq ?)
96  (* pop_frame          ≝ *) ((λ_.λ_.λ_.λ_.λst.pop_ra … st)).
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