79 lines
2.6 KiB
OCaml
79 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 1996 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 Alpha processor *)
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open Format
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(* Addressing modes *)
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type addressing_mode =
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Ibased of string * int (* symbol + displ *)
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| Iindexed of int (* reg + displ *)
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(* Specific operations *)
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type specific_operation =
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Iadd4 | Iadd8 | Isub4 | Isub8 (* Scaled adds and subs *)
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| Ireloadgp of bool (* The ldgp instruction *)
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| Itrunc32 (* Truncate 64-bit int to 32 bit *)
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(* Sizes, endianness *)
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let big_endian = false
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let size_addr = 8
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let size_int = 8
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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 addr delta =
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match addr with
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Ibased(s, n) -> Ibased(s, n + delta)
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| Iindexed n -> Iindexed(n + delta)
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let num_args_addressing = function
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Ibased(s, n) -> 0
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| Iindexed n -> 1
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(* Printing operations and addressing modes *)
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let print_addressing printreg addr ppf arg =
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match addr with
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| Ibased(s, n) ->
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fprintf ppf "\"%s\"%s" s
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(if n <> 0 then Printf.sprintf " + %i" n else "")
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| Iindexed n ->
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fprintf ppf "%a%s" printreg arg.(0)
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(if n <> 0 then Printf.sprintf " + %i" n else "")
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let print_specific_operation printreg op ppf arg =
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match op with
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| Iadd4 -> fprintf ppf "%a * 4 + %a" printreg arg.(0) printreg arg.(1)
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| Iadd8 -> fprintf ppf "%a * 8 + %a" printreg arg.(0) printreg arg.(1)
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| Isub4 -> fprintf ppf "%a * 4 - %a" printreg arg.(0) printreg arg.(1)
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| Isub8 -> fprintf ppf "%a * 8 - %a" printreg arg.(0) printreg arg.(1)
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| Ireloadgp _ -> fprintf ppf "ldgp"
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| Itrunc32 -> fprintf ppf "truncate32 %a" printreg arg.(0)
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(* Distinguish between the Digital assembler and other assemblers (e.g. gas) *)
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let digital_asm =
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match Config.system with
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"digital" -> true
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| _ -> false
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