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Diffstat (limited to 'src/elf_loader.ml')
| -rw-r--r-- | src/elf_loader.ml | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/elf_loader.ml b/src/elf_loader.ml new file mode 100644 index 00000000..7e4fad07 --- /dev/null +++ b/src/elf_loader.ml @@ -0,0 +1,124 @@ +(**************************************************************************) +(* 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. *) +(**************************************************************************) + +module Big_int = Nat_big_num + +let opt_elf_threads = ref 1 +let opt_elf_entry = ref Big_int.zero + +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, 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 = seg.elf64_segment_paddr in + let base = seg.elf64_segment_base in + let offset = seg.elf64_segment_offset in + prerr_endline "\nLoading Segment"; + prerr_endline ("Segment offset: " ^ Big_int.to_string offset); + prerr_endline ("Segment base address: " ^ Big_int.to_string base); + prerr_endline ("Segment physical address: " ^ Big_int.to_string paddr); + print_segment seg; + List.iteri (fun i byte -> Sail_lib.wram (Big_int.add paddr (Big_int.of_int i)) byte) (List.map int_of_char bs) + +let load_elf name = + let segments, e_entry = read name in + opt_elf_entry := e_entry; + List.iter load_segment segments + +(* The sail model can access this by externing a unit -> int function + as Elf_loader.elf_entry. *) +let elf_entry () = !opt_elf_entry |