diff options
Diffstat (limited to 'asm/asmpars.mly')
| -rw-r--r-- | asm/asmpars.mly | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/asm/asmpars.mly b/asm/asmpars.mly new file mode 100644 index 0000000..ebc4ae7 --- /dev/null +++ b/asm/asmpars.mly @@ -0,0 +1,163 @@ +%{ + open Asm + + let unsigned = function + | Addu + | Subu + | Mulu + | Divu + | Sltu + | Sleu + | Jltru + | Jleru + -> true + | _ -> false + + let pc = ref 0 + + let ram = ref 0x8000 + + let add r i = r := !r + i + + let lbls2 = ref (Imap.empty) + + let li u r = function + | Imm i -> + let c = + if u then i < 1 lsl 8 + else i >= -(1 lsl 7) && i < 1 lsl 7 in + if c then (add pc 2; [Lilz (r,Imm i)]) + else (add pc 4; [Lilz (r,Imm (i land 0x00FF)); Liu (r,Imm ((i land 0xFF00) lsr 8))]) + | Lab id -> + add pc 4; [Lilz (r,Lab id); Liu (r,Labu id)] + | _ -> assert false + + let up = function + | Imm i -> Imm i + | Lab l -> Labu l + | _ -> assert false + + let explode s = (* string -> char list *) + let rec exp i l = + if i < 0 then l else exp (i - 1) (s.[i] :: l) in + exp (String.length s - 1) [];; +%} + +%token EOF,COLON,TEXT,DATA,BYTE,WORD,ASCIIZ,MINUS,MOVE,JZ,JNZ,LP,RP +%token POP,PUSH,INCRI,SHI,JJ,JAL,JR,JALR,LW,SW,LB,SB,NOT,LIL,LILZ,LIU,LIUZ,LRA,LA,LI +%token<Asm.reg> REG +%token<Asm.fmt_r> ROP,RIOP +%token<string> ID +%token<int> INT +%token<string> STR + +%start<Asm.program> program + +%% + +program: + TEXT is=instr* d=data? EOF + { { text = List.flatten is; + data = (match d with Some l -> List.flatten l | None -> []); + lbls = !lbls2 } } + +data: + DATA d=datas* { d } + +datas: + | l=label_ram d=datas { d } + | BYTE bs=int* { List.map (fun i -> add ram 1; i,false) bs } + | WORD bs=int* { List.map (fun i -> add ram 2; i,true) bs } + | ASCIIZ s=STR { + add ram 1; + List.map (fun c -> add ram 1; Char.code c, false) (explode s) @ [0, false] + } + +label_ram: + id=ID COLON { lbls2 := Imap.add id !ram !lbls2; id } +label_pc: + id=ID COLON { lbls2 := Imap.add id !pc !lbls2; id } + +instr: + | l=label_pc i=instr { i } + | i=_instr { i } + +_instr: + | o=ROP r1=REG r2=REG r3=REG { add pc 2; [R (o,r1,r2,r3)] } + | o=RIOP r1=REG r2=REG imm=imm + { let l = li (unsigned o) 5 imm in + add pc 2; l @ [R (o,r1,r2,5)] } + | INCRI r=REG i=int { + if i >= - (1 lsl 7) && i < 1 lsl 7 then + (add pc 2; [Incri (r,i)]) + else let l = li false 5 (Imm i) in + (add pc 2; l @ [R (Add,r,r,5)]) } + | SHI r=REG i=int { add pc 2; [Shi (r,i)] } + | JJ i=imm { add pc 2; [J i] } + | LI r=REG i=imm { li false r i } + | JR r=REG { add pc 2; [Jr r] } + | JAL i=imm { add pc 2; [Jal i] } + | JALR r=REG { add pc 2; [Jalr r] } + | LW r1=REG i=int LP r2=REG RP { + if i >= - (1 lsl 4) && i < 1 lsl 4 then + (add pc 2; [Lw (r1,r2,i)]) + else let l = li false 5 (Imm i) in + (add pc 2; l @ [R (Lwr,r1,r2,5)]) } + | SW r1=REG i=int LP r2=REG RP { + if i >= - (1 lsl 4) && i < 1 lsl 4 then + (add pc 2; [Sw (r1,r2,i)]) + else let l = li false 5 (Imm i) in + (add pc 2; l @ [R (Swr,r1,r2,5)]) } + | LB r1=REG i=int LP r2=REG RP { + if i >= - (1 lsl 4) && i < 1 lsl 4 then + (add pc 2; [Lb (r1,r2,i)]) + else let l = li false 5 (Imm i) in + (add pc 2; l @ [R (Lbr,r1,r2,5)]) } + | SB r1=REG i=int LP r2=REG RP { + if i >= - (1 lsl 4) && i < 1 lsl 4 then + (add pc 2; [Sb (r1,r2,i)]) + else let l = li false 5 (Imm i) in + (add pc 2; l @ [R (Sbr,r1,r2,5)]) } + | LW r1=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [Lw (r1,5,0)] } + | LB r1=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [Lb (r1,5,0)] } + | SW r1=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [Sw (r1,5,0)] } + | SB r1=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [Sb (r1,5,0)] } + | LRA i=int { assert (i > -(1 lsl 10) && i < 1 lsl 10); + add pc 2; [Lra (Imm i)] } + | LRA l=ID { add pc 2; [Lra (Lab l)] } + | LA r=REG l=ID { li false r (Lab l) } + | LIL r=REG i=int { add pc 2; [Lil (r,Imm i)] } + | LILZ r=REG i=int { add pc 2; [Lilz (r,Imm i)] } + | LIU r=REG i=int { add pc 2; [Liu (r,Imm i)] } + | LIUZ r=REG i=int { add pc 2; [Liuz (r,Imm i)] } + | MOVE r1=REG r2=REG { add pc 2; [R (Add,r1,r2,0)] } + | NOT r1=REG r2=REG { add pc 2; [R (Nor,r1,r2,0)] } + | JZ r=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [R (Jer,5,r,0)] } + | JNZ r=REG l=ID { let l = li false 5 (Lab l) in + add pc 2; l @ [R (Jner,5,r,0)] } + | POP r=REG { add pc 4; [Lw (r,7,0); Incri (7,2)] } + | PUSH r=REG { add pc 4; [Incri (7,-2); Sw (r,7,0)] } + | ASCIIZ s=STR { + let bytes = List.map Char.code (explode s) @ [0] in + let rec pair = function + | a::b::q -> (a, b)::(pair q) + | [a] -> [(a, 0)] + | [] -> [] + in + let words = pair bytes in + add pc (List.length bytes); + List.map (fun (a, b) -> TwoRawBytes (a, b)) words + } + +imm: + | id=ID { Lab id } + | n=int { Imm n } + +int: + | n=INT { n } + | MINUS n=INT { - n } |