Add ocaml run-time and updates to sail for ocaml backend

1 files changed, 132 insertions, 0 deletions

diff --git a/lib/ocaml_rts/elf_loader.ml b/lib/ocaml_rts/elf_loader.ml
new file mode 100644
index 00000000..4e35a192
--- /dev/null
+++ b/lib/ocaml_rts/elf_loader.ml
@@ -0,0 +1,132 @@
+(**************************************************************************)
+(*     Sail                                                               *)
+(*                                                                        *)
+(*  Copyright (c) 2013-2017                                               *)
+(*    Kathyrn Gray                                                        *)
+(*    Shaked Flur                                                         *)
+(*    Stephen Kell                                                        *)
+(*    Gabriel Kerneis                                                     *)
+(*    Robert Norton-Wright                                                *)
+(*    Christopher Pulte                                                   *)
+(*    Peter Sewell                                                        *)
+(*    Alasdair Armstrong                                                  *)
+(*                                                                        *)
+(*  All rights reserved.                                                  *)
+(*                                                                        *)
+(*  This software was developed by the University of Cambridge Computer   *)
+(*  Laboratory as part of the Rigorous Engineering of Mainstream Systems  *)
+(*  (REMS) project, funded by EPSRC grant EP/K008528/1.                   *)
+(*                                                                        *)
+(*  Redistribution and use in source and binary forms, with or without    *)
+(*  modification, are permitted provided that the following conditions    *)
+(*  are met:                                                              *)
+(*  1. Redistributions of source code must retain the above copyright     *)
+(*     notice, this list of conditions and the following disclaimer.      *)
+(*  2. Redistributions in binary form must reproduce the above copyright  *)
+(*     notice, this list of conditions and the following disclaimer in    *)
+(*     the documentation and/or other materials provided with the         *)
+(*     distribution.                                                      *)
+(*                                                                        *)
+(*  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''    *)
+(*  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED     *)
+(*  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A       *)
+(*  PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR   *)
+(*  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,          *)
+(*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      *)
+(*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF      *)
+(*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND   *)
+(*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,    *)
+(*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT    *)
+(*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF    *)
+(*  SUCH DAMAGE.                                                          *)
+(**************************************************************************)
+
+open Big_int
+
+let opt_file_arguments = ref ([] : string list)
+let opt_elf_threads = ref 1
+
+let options = Arg.align []
+
+let usage_msg = "Sail OCaml RTS options:"
+
+let () =
+  Arg.parse options (fun s -> opt_file_arguments := !opt_file_arguments @ [s]) usage_msg
+
+type word8 = int
+
+let escape_char c =
+  if int_of_char c <= 31 then '.'
+  else if int_of_char c >= 127 then '.'
+  else c
+
+let hex_line bs =
+  let hex_char i c =
+    (if i mod 2 == 0 && i <> 0 then " " else "") ^ Printf.sprintf "%02x" (int_of_char c)
+  in
+  String.concat "" (List.mapi hex_char bs) ^ " " ^ String.concat "" (List.map (fun c -> Printf.sprintf "%c" (escape_char c)) bs)
+
+let rec break n = function
+  | [] -> []
+  | (_ :: _ as xs) -> [Lem_list.take n xs] @ break n (Lem_list.drop n xs)
+
+let print_segment seg =
+  let (Byte_sequence.Sequence bs) = seg.Elf_interpreted_segment.elf64_segment_body in
+  prerr_endline "0011 2233 4455 6677 8899 aabb ccdd eeff 0123456789abcdef";
+  List.iter (fun bs -> prerr_endline (hex_line bs)) (break 16 bs)
+
+let read name =
+  let info = Sail_interface.populate_and_obtain_global_symbol_init_info name in
+
+  prerr_endline "Elf read:";
+  let (elf_file, elf_epi, symbol_map) =
+    begin match info with
+    | Error.Fail s -> failwith (Printf.sprintf "populate_and_obtain_global_symbol_init_info: %s" s)
+    | Error.Success ((elf_file: Elf_file.elf_file),
+                     (elf_epi: Sail_interface.executable_process_image),
+                     (symbol_map: Elf_file.global_symbol_init_info))
+      ->
+       prerr_endline (Sail_interface.string_of_executable_process_image elf_epi);
+       (elf_file, elf_epi, symbol_map)
+    end
+  in
+
+  prerr_endline "\nElf segments:";
+  let (segments, e_entry, e_machine) =
+    begin match elf_epi, elf_file with
+    | (Sail_interface.ELF_Class_32 _, _) -> failwith "cannot handle ELF_Class_32"
+    | (_, Elf_file.ELF_File_32 _)  -> failwith "cannot handle ELF_File_32"
+    | (Sail_interface.ELF_Class_64 (segments, e_entry, e_machine), Elf_file.ELF_File_64 f1) ->
+       (* remove all the auto generated segments (they contain only 0s) *)
+       let segments =
+         Lem_list.mapMaybe
+           (fun (seg, prov) -> if prov = Elf_file.FromELF then Some seg else None)
+           segments
+       in
+       (segments, big_int_of_string (Nat_big_num.to_string e_entry),e_machine)
+    end
+  in
+  (segments, e_entry)
+
+let load_segment seg =
+  let open Elf_interpreted_segment in
+  let (Byte_sequence.Sequence bs) = seg.elf64_segment_body in
+  let paddr = big_int_of_string (Nat_big_num.to_string (seg.elf64_segment_paddr)) in
+  let base = big_int_of_string (Nat_big_num.to_string (seg.elf64_segment_base)) in
+  let offset = big_int_of_string (Nat_big_num.to_string (seg.elf64_segment_offset)) in
+  prerr_endline "\nLoading Segment";
+  prerr_endline ("Segment offset: " ^ string_of_big_int offset);
+  prerr_endline ("Segment base address: " ^ string_of_big_int base);
+  prerr_endline ("Segment physical address: " ^ string_of_big_int paddr);
+  print_segment seg;
+  List.iteri (fun i byte -> Sail_lib.wram (add_big_int paddr (big_int_of_int i)) byte) (List.map int_of_char bs)
+
+let load_elf () =
+  let name =
+    match !opt_file_arguments with
+    | (name :: _) -> name
+    | [] -> failwith "Must provide an elf file"
+  in
+  let segments, e_entry = read name in
+  List.iter load_segment segments;
+  ()