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(***********************************************************************)
(* *)
(* Objective Caml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(* Description of the Motorola 680x0 processor *)
open Misc
open Arch
open Formatmsg
open Cmm
open Reg
open Mach
(* Registers available for register allocation *)
(* Register map:
A0 - A6 0-6 address registers (A2-A6 callee-save)
A7 stack pointer
D0 - D4 7-11 data registers (D2 - D7 callee-save)
D5 temporary
D6 allocation pointer
D7 trap pointer
FP0 - FP7 12-19 floating-point registers (FP2 - FP7 callee-save)
*)
let register_names =
[| "a0"; "a1"; "a2"; "a3"; "a4"; "a5"; "a6";
"d0"; "d1"; "d2"; "d3"; "d4";
"fp0"; "fp1"; "fp2"; "fp3"; "fp4"; "fp5"; "fp6"; "fp7" |]
let num_register_classes = 3
let register_class r =
match r.typ with
Addr -> 0
| Int -> 1
| Float -> 2
let num_available_registers = [| 7; 5; 8 |]
let first_available_register = [| 0; 7; 12 |]
let register_name r = register_names.(r)
(* There is no scheduling, so just pack registers. *)
let rotate_registers = false
(* Representation of hard registers by pseudo-registers *)
let all_phys_regs =
let v = Array.create 20 Reg.dummy in
for i = 0 to 6 do v.(i) <- Reg.at_location Addr (Reg i) done;
for i = 7 to 11 do v.(i) <- Reg.at_location Int (Reg i) done;
for i = 12 to 19 do v.(i) <- Reg.at_location Float (Reg i) done;
v
let phys_reg n = all_phys_regs.(n)
let stack_slot slot ty = Reg.at_location ty (Stack slot)
let reg_A0 = phys_reg 0
let reg_FP0 = phys_reg 12
(* Instruction selection *)
let word_addressed = false
(* Calling conventions *)
let calling_conventions first_addr last_addr first_float last_float
make_stack arg =
let loc = Array.create (Array.length arg) Reg.dummy in
let addr = ref first_addr in
let float = ref first_float in
let ofs = ref 0 in
for i = 0 to Array.length arg - 1 do
match arg.(i).typ with
(Addr | Int) as ty ->
if !addr <= last_addr then begin
loc.(i) <- phys_reg !addr;
incr addr
end else begin
loc.(i) <- stack_slot (make_stack !ofs) ty;
ofs := !ofs + size_addr
end
| Float ->
if !float <= last_float then begin
loc.(i) <- phys_reg !float;
incr float
end else begin
loc.(i) <- stack_slot (make_stack !ofs) Float;
ofs := !ofs + size_float
end
done;
(loc, !ofs)
let incoming ofs = Incoming ofs
let outgoing ofs = Outgoing ofs
let not_supported ofs = fatal_error "Proc.loc_results: cannot call"
let loc_arguments arg =
calling_conventions 0 5 12 18 outgoing arg
let loc_parameters arg =
let (loc, ofs) = calling_conventions 0 5 12 18 incoming arg in loc
let loc_results res =
let (loc, ofs) = calling_conventions 0 5 12 18 not_supported res in loc
let extcall_use_push = true
let loc_external_arguments arg =
fatal_error "Proc.loc_external_arguments"
let loc_external_results res =
let (loc, ofs) = calling_conventions 7 7 12 12 not_supported res in loc
let loc_exn_bucket = reg_A0
(* Registers destroyed by operations *)
let destroyed_at_c_call =
Array.of_list(List.map phys_reg [0; 1; 7; 8; 12; 13])
let destroyed_at_oper = function
Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
| Iop(Iextcall(_, false)) -> destroyed_at_c_call
| Iop(Iintoffloat) -> [| reg_FP0 |]
| _ -> [||]
let destroyed_at_raise = all_phys_regs
(* Maximal register pressure *)
let safe_register_pressure op = 5
let max_register_pressure = function
Iextcall(_, _) -> [| 5; 3; 6 |]
| Iintoffloat -> [| 7; 5; 7 |]
| _ -> num_available_registers
(* Layout of the stack frame *)
let num_stack_slots = [| 0; 0; 0 |]
let contains_calls = ref false
(* Calling the assembler *)
let assemble_file infile outfile =
Ccomp.command ("as -o " ^ outfile ^ " " ^ infile)
|
