86 lines
2.6 KiB
OCaml
86 lines
2.6 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1998 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the Q Public License version 1.0. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(* Specific operations for the ARM processor *)
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open Misc
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open Formatmsg
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(* Addressing modes *)
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type addressing_mode =
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Iindexed of int (* reg + displ *)
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(* We do not support the reg + shifted reg addressing mode, because
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what we really need is reg + shifted reg + displ,
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and this is decomposed in two instructions (reg + shifted reg -> tmp,
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then addressing tmp + displ). *)
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(* Specific operations *)
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type specific_operation =
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Ishiftarith of arith_operation * int
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| Ishiftcheckbound of int
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| Irevsubimm of int
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and arith_operation =
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Ishiftadd
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| Ishiftsub
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| Ishiftsubrev
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(* Sizes, endianness *)
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let big_endian = false
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let size_addr = 4
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let size_int = 4
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let size_float = 8
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(* Operations on addressing modes *)
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let identity_addressing = Iindexed 0
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let offset_addressing (Iindexed n) delta = Iindexed(n + delta)
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let num_args_addressing (Iindexed n) = 1
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(* Printing operations and addressing modes *)
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let print_addressing printreg addr arg =
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match addr with
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Iindexed n ->
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printreg arg.(0);
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if n <> 0 then begin print_string " + "; print_int n end
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let print_specific_operation printreg op arg =
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match op with
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Ishiftarith(op, shift) ->
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printreg arg.(0);
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begin match op with
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Ishiftadd -> print_string " + "
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| Ishiftsub -> print_string " - "
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| Ishiftsubrev -> print_string " -rev "
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end;
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printreg arg.(1);
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if shift >= 0
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then begin print_string " << "; print_int shift end
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else begin print_string " >> "; print_int (-shift) end
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| Ishiftcheckbound n ->
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print_string "check ";
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printreg arg.(0);
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print_string " >> "; print_int n; print_string " > ";
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printreg arg.(1)
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| Irevsubimm n ->
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print_int n; print_string " - "; printreg arg.(0)
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