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c54547dad9
Author | SHA1 | Date | |
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Théophile Bastian | c54547dad9 | ||
Théophile Bastian | 24383471fd |
1
.gitignore
vendored
1
.gitignore
vendored
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@ -20,3 +20,4 @@ _build/
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setup.data
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setup.log
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.merlin
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2
dune-project
Normal file
2
dune-project
Normal file
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@ -0,0 +1,2 @@
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(lang dune 1.9)
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(using menhir 2.0)
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131
src/asm_acquire.ml
Normal file
131
src/asm_acquire.ml
Normal file
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@ -0,0 +1,131 @@
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(** Module to acquire the ASM of a given ELF object by its path
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Uses `objdump -d` internally, and parses the output
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*)
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module StrMap = Map.Make(String)
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(** A memory address *)
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type addr_t = int
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(** A single asm instruction *)
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type asm_instr_t = {
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instr_addr: addr_t; (** Memory location of this instruction *)
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instr_bytes: Bytes.t; (** Binary representation of the instruction *)
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instr_asm: string; (** Asm for the instruction (eg `movq …`) *)
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}
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type asm_t = asm_instr_t list
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type asm_sub_t = {
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sub_section: string;
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sub_name: string;
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sub_addr: addr_t;
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sub_asm: asm_t;
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}
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type asm_info_t = asm_sub_t StrMap.t
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exception ParseError of string
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(** Pretty printers *)
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let pp_hex_bytes ppx bytes_array =
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Bytes.iter (fun byte -> Format.fprintf ppx "%02x" (int_of_char byte))
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bytes_array
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let pp_asm_instr ppx asm_instr =
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Format.fprintf ppx "%04x:\t%a\t%s@."
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asm_instr.instr_addr
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pp_hex_bytes asm_instr.instr_bytes
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asm_instr.instr_asm
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let pp_asm ppx asm_instrs = List.iter (pp_asm_instr ppx) asm_instrs
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let pp_asm_sub ppx asm_sub =
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Format.fprintf ppx "%016x <%s> {%s}:@.@[%a@]@."
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asm_sub.sub_addr
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asm_sub.sub_name
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asm_sub.sub_section
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pp_asm asm_sub.sub_asm
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let pp_asm_info ppx asm_info =
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StrMap.iter (fun _ asm_sub -> Format.fprintf ppx "%a" pp_asm_sub asm_sub)
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asm_info
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(** Reads the whole content of a Unix file descriptor, returning it as a Bytes
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sequence *)
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let read_all_fd fd =
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Unix.set_nonblock fd ;
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let rec do_read accu cur_size =
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let n_accu = Bytes.extend accu 0 256 in
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let bytes_read = (
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try
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Unix.read fd n_accu cur_size 256
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with
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| Unix.Unix_error(Unix.EAGAIN, _, _)
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| Unix.Unix_error(Unix.EWOULDBLOCK, _, _) ->
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0
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) in
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if bytes_read = 256 then
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do_read n_accu (cur_size + 256)
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else (
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Bytes.extend n_accu 0 (bytes_read - 256)
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)
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in
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do_read (Bytes.create 0) 0
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(** Raised when the call to objdump failed. An exception
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[ObjdumpFailed (status_code, stderr)] will contain the status code of the
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objdump process, and its stderr contents as a string. *)
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exception ObjdumpFailed of int * string
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(** Runs `objdump -d prog_path` and returns its stdout as a string *)
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let get_objdump prog_path =
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(* Setup process *)
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let stdin_read, stdin = Unix.pipe () in
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let stdout, stdout_write = Unix.pipe () in
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let stderr, stderr_write = Unix.pipe () in
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(* Run the process *)
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Format.eprintf "Running objdump...@." ;
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let objdump_pid = Unix.create_process
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"objdump"
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[| "objdump" ; "-d" ; prog_path |]
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stdin_read stdout_write stderr_write
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in
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(* Close stdin already: we won't send anything and make it clear *)
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Unix.close stdin ;
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Format.eprintf "\tPID = %d@." objdump_pid;
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let pid, status = Unix.waitpid [] objdump_pid in
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if pid <> objdump_pid then
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raise (Failure ("Could not properly wait on objdump")) ;
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Format.eprintf "Run objdump: done. Status: %a@." (fun ppx sc -> match sc with
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| Unix.WEXITED ex_code -> Format.fprintf ppx "%d" ex_code
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| _ -> Format.fprintf ppx "Not exited") status ;
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(* Extract stdout, stderr data *)
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let stdout_content = read_all_fd stdout in
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let stderr_content = read_all_fd stderr in
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(* Properly close pipes *)
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Unix.close stdout ;
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Unix.close stderr ;
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(* Check status code *)
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match status with
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| Unix.WEXITED 0 ->
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Bytes.to_string stdout_content
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| Unix.WEXITED err_code ->
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raise (ObjdumpFailed (err_code, (Bytes.to_string stderr_content)))
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| _ ->
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raise (ObjdumpFailed (-1, (Bytes.to_string stderr_content)))
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(** Interprets `objdump -d` output and yield a list of functions, alongside
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with their addresses, symbol names, asm, … *)
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let interpret_objdump objdump_out : asm_info_t =
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(* TODO *)
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ignore objdump_out;
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assert false
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55
src/elf_arrows.ml
Normal file
55
src/elf_arrows.ml
Normal file
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@ -0,0 +1,55 @@
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(** Entry point file for elf_arrows *)
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exception NotElf;;
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exception NoDwarf;;
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exception NoDwarfStatic;;
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let (>>=) = Error.bind
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let make_pp linksem_pp =
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(fun fmt arg ->
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linksem_pp arg
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|> Format.fprintf fmt "%s")
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type elf_path = string
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type elf_handle = ElfHandle of elf_path * Elf_file.elf_file * Dwarf.dwarf_static
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(** Open an ELF file and loads its dwarf_static infos. *)
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let open_elf elf_path =
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(Byte_sequence.acquire elf_path >>= fun elf_bs -> (
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match Elf_file.read_elf64_file elf_bs with
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| Error.Success elf64 -> Error.Success (Elf_file.ELF_File_64 elf64)
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| Error.Fail _ -> (match Elf_file.read_elf32_file elf_bs with
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| Error.Success elf32 -> Error.Success (Elf_file.ELF_File_32 elf32)
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| Error.Fail _ -> raise NotElf)
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))
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>>= fun elf_file -> (
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let static_info = (match Dwarf.extract_dwarf_static elf_file with
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| Some static_info -> static_info
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| None -> raise NoDwarfStatic) in
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Error.Success (ElfHandle (elf_path, elf_file, static_info)))
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let elf_files = ref []
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let speclist = []
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let parse_anon_arg arg =
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elf_files := arg :: (!elf_files)
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let _ =
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Arg.parse speclist parse_anon_arg "./test ELF_FILE" ;
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let elf_handles = List.rev @@
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List.map (fun path -> match open_elf path with
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| Error.Success handle -> handle
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| Error.Fail msg ->
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raise (Failure ("Could not open " ^ path ^ ": " ^ msg)))
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!elf_files
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in
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List.iter (fun (ElfHandle(path, _, static_info)) ->
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let line_info = static_info.ds_evaluated_line_info in
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Format.eprintf "Line infos <%s>:@. %a@."
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path
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(make_pp Dwarf.pp_evaluated_line_info)
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line_info ;
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) elf_handles
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