210 lines
6.5 KiB
OCaml
210 lines
6.5 KiB
OCaml
(***********************************************************************)
|
|
(* *)
|
|
(* 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 Mips processor *)
|
|
|
|
open Misc
|
|
open Cmm
|
|
open Reg
|
|
open Arch
|
|
open Mach
|
|
|
|
(* Instruction selection *)
|
|
|
|
let word_addressed = false
|
|
|
|
(* Registers available for register allocation *)
|
|
|
|
(* Register map:
|
|
$0 always 0
|
|
$1 temporary for the assembler
|
|
$2 - $7 0 - 5 function results
|
|
$8 - $15 6 - 13 function arguments
|
|
$16 - $21 14 - 19 general purpose (preserved by C)
|
|
$22 allocation pointer (preserved by C)
|
|
$23 allocation limit (preserved by C)
|
|
$24 - $25 temporaries
|
|
$26 - $29 kernel regs, stack pointer, global pointer
|
|
$30 trap pointer (preserved by C)
|
|
$31 return address
|
|
|
|
$f0 - $f3 100 - 103 function results
|
|
$f4 - $f11 104 - 111 general purpose
|
|
$f12 - $f19 112 - 119 function arguments
|
|
$f20 - $f30 120 - 130 general purpose (even numbered preserved by C)
|
|
$f31 temporary *)
|
|
|
|
let int_reg_name = [|
|
|
(* 0-5 *) "$2"; "$3"; "$4"; "$5"; "$6"; "$7";
|
|
(* 6-13 *) "$8"; "$9"; "$10"; "$11"; "$12"; "$13"; "$14"; "$15";
|
|
(* 14-19 *) "$16"; "$17"; "$18"; "$19"; "$20"; "$21"
|
|
|]
|
|
|
|
let float_reg_name = [|
|
|
"$f0"; "$f1"; "$f2"; "$f3"; "$f4";
|
|
"$f5"; "$f6"; "$f7"; "$f8"; "$f9";
|
|
"$f10"; "$f11"; "$f12"; "$f13"; "$f14";
|
|
"$f15"; "$f16"; "$f17"; "$f18"; "$f19";
|
|
"$f20"; "$f21"; "$f22"; "$f23"; "$f24";
|
|
"$f25"; "$f26"; "$f27"; "$f28"; "$f29"; "$f30"
|
|
|]
|
|
|
|
let num_register_classes = 2
|
|
|
|
let register_class r =
|
|
match r.typ with
|
|
Int -> 0
|
|
| Addr -> 0
|
|
| Float -> 1
|
|
|
|
let num_available_registers = [| 20; 31 |]
|
|
|
|
let first_available_register = [| 0; 100 |]
|
|
|
|
let register_name r =
|
|
if r < 100 then int_reg_name.(r) else float_reg_name.(r - 100)
|
|
|
|
let rotate_registers = true
|
|
|
|
(* Representation of hard registers by pseudo-registers *)
|
|
|
|
let hard_int_reg =
|
|
let v = Array.create 20 Reg.dummy in
|
|
for i = 0 to 19 do v.(i) <- Reg.at_location Int (Reg i) done;
|
|
v
|
|
|
|
let hard_float_reg =
|
|
let v = Array.create 31 Reg.dummy in
|
|
for i = 0 to 30 do v.(i) <- Reg.at_location Float (Reg(100 + i)) done;
|
|
v
|
|
|
|
let all_phys_regs =
|
|
Array.append hard_int_reg hard_float_reg
|
|
|
|
let phys_reg n =
|
|
if n < 100 then hard_int_reg.(n) else hard_float_reg.(n - 100)
|
|
|
|
let stack_slot slot ty =
|
|
Reg.at_location ty (Stack slot)
|
|
|
|
(* Calling conventions *)
|
|
|
|
let calling_conventions first_int last_int first_float last_float
|
|
make_stack arg =
|
|
let loc = Array.create (Array.length arg) Reg.dummy in
|
|
let int = ref first_int 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
|
|
Int | Addr as ty ->
|
|
if !int <= last_int then begin
|
|
loc.(i) <- phys_reg !int;
|
|
incr int
|
|
end else begin
|
|
loc.(i) <- stack_slot (make_stack !ofs) ty;
|
|
ofs := !ofs + size_int
|
|
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, Misc.align !ofs 16) (* Keep stack 16-aligned *)
|
|
|
|
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 6 13 112 119 outgoing arg
|
|
let loc_parameters arg =
|
|
let (loc, ofs) = calling_conventions 6 13 112 119 incoming arg in loc
|
|
let loc_results res =
|
|
let (loc, ofs) = calling_conventions 0 5 100 103 not_supported res in loc
|
|
|
|
(* The C calling conventions are as follows:
|
|
the first 8 arguments are passed either in integer regs $4...$11
|
|
or float regs $f12...$f19. Each argument "consumes" both one slot
|
|
in the int register file and one slot in the float register file.
|
|
Extra arguments are passed on stack, in a 64-bits slot, right-justified
|
|
(i.e. at +4 from natural address). *)
|
|
|
|
let loc_external_arguments arg =
|
|
let loc = Array.create (Array.length arg) Reg.dummy in
|
|
let int = ref 2 in
|
|
let float = ref 112 in
|
|
let ofs = ref 0 in
|
|
for i = 0 to Array.length arg - 1 do
|
|
if i < 8 then begin
|
|
loc.(i) <- phys_reg (if arg.(i).typ = Float then !float else !int);
|
|
incr int;
|
|
incr float
|
|
end else begin
|
|
begin match arg.(i).typ with
|
|
Float -> loc.(i) <- stack_slot (Outgoing !ofs) Float
|
|
| ty -> loc.(i) <- stack_slot (Outgoing (!ofs + 4)) ty
|
|
end;
|
|
ofs := !ofs + 8
|
|
end
|
|
done;
|
|
(loc, Misc.align !ofs 16)
|
|
|
|
let loc_external_results res =
|
|
let (loc, ofs) = calling_conventions 0 0 100 100 not_supported res in loc
|
|
|
|
let loc_exn_bucket = phys_reg 0 (* $2 *)
|
|
|
|
(* Registers destroyed by operations *)
|
|
|
|
let destroyed_at_c_call =
|
|
(* $16 - $21, $f20, $f22, $f24, $f26, $f28, $f30 preserved *)
|
|
Array.of_list(List.map phys_reg
|
|
[0;1;2;3;4;5;6;7;8;9;10;11;12;13;
|
|
100;101;102;103;104;105;106;107;108;109;110;111;112;113;114;
|
|
115;116;117;118;119;121;123;125;127;129])
|
|
|
|
let destroyed_at_oper = function
|
|
Iop(Icall_ind | Icall_imm _ | Iextcall(_, true)) -> all_phys_regs
|
|
| Iop(Iextcall(_, false)) -> destroyed_at_c_call
|
|
| _ -> [||]
|
|
|
|
let destroyed_at_raise = all_phys_regs
|
|
|
|
(* Maximal register pressure *)
|
|
|
|
let safe_register_pressure = function
|
|
Iextcall(_, _) -> 6
|
|
| _ -> 20
|
|
let max_register_pressure = function
|
|
Iextcall(_, _) -> [| 6; 6 |]
|
|
| _ -> [| 20; 31 |]
|
|
|
|
(* Layout of the stack *)
|
|
|
|
let num_stack_slots = [| 0; 0 |]
|
|
let contains_calls = ref false
|
|
|
|
(* Calling the assembler *)
|
|
|
|
let asm_command = "as -n32 -O2 -nocpp -g0 -o "
|
|
|
|
let assemble_file infile outfile =
|
|
Ccomp.command (asm_command ^ outfile ^ " " ^ infile)
|
|
|