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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT COMPILER COMPONENTS --
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4 -- --
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5 -- V X L I N K . M A I N --
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6 -- --
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7 -- B o d y --
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8 -- --
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9 -- Copyright (C) 2018, AdaCore --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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17 -- for more details. You should have received a copy of the GNU General --
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18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
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19 -- http://www.gnu.org/licenses for a complete copy of the license. --
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20 -- --
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21 -- GNAT was originally developed by the GNAT team at New York University. --
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22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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23 -- --
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24 ------------------------------------------------------------------------------
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25
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26 -- VxLink is a helper tool used as a wrapper around g++/gcc to build VxWorks
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27 -- DKM (Downloadable Kernel Modules).
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28 -- Such DKM is a partially linked object that contains entry points for
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29 -- constructors and destructors. This tool thus uses g++ to generate an
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30 -- intermediate partially linked object, retrieves the list of constructors
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31 -- and destructors in it and produces a C file that lists those ctors/dtors
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32 -- in a way that is understood be VxWorks kernel. It then links this file
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33 -- with the intermediate object to produce a valid DKM.
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34
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35 pragma Ada_2012;
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36
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37 with GNAT.OS_Lib; use GNAT.OS_Lib;
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38
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39 with VxLink.Link; use VxLink.Link;
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40 with VxLink.Bind; use VxLink.Bind;
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41
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42 procedure VxLink.Main is
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43 Linker : VxLink_Linker;
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44 Binder : VxLink_Binder;
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45 VSB_Dir : String_Access := Getenv ("VSB_DIR");
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46 begin
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47 Initialize (Linker);
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48
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49 if Is_Error_State then
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50 return;
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51 end if;
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52
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53 Do_Initial_Link (Linker);
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54
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55 if Is_Error_State then
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56 return;
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57 end if;
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58
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59 if not Needs_CDtor (Linker) then
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60 -- Initial link is enough, let's return
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61 return;
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62 end if;
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63
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64 if VSB_Dir /= null and then VSB_Dir'Length > 0 then
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65 declare
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66 DKM_Tag_File : constant String :=
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67 Normalize_Pathname
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68 ("krnl/tags/dkm.tags", VSB_Dir.all);
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69 begin
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70 if Is_Regular_File (DKM_Tag_File) then
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71 Parse_Tag_File (Binder, DKM_Tag_File);
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72 end if;
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73 end;
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74 end if;
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75
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76 Initialize (Binder, Object_File => Partial_Object (Linker));
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77 Emit_CTDT (Binder, Namespace => Namespace (Linker));
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78
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79 Do_Final_Link (Linker, CTDT_File (Binder));
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80 Free (VSB_Dir);
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81 end VxLink.Main;
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