| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT RUN-TIME COMPONENTS -- |
| -- -- |
| -- G N A T . T R A C E B A C K . S Y M B O L I C . M O D U L E _ N A M E -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2012-2021, AdaCore -- |
| -- -- |
| -- GNAT is free software; you can redistribute it and/or modify it under -- |
| -- terms of the GNU General Public License as published by the Free Soft- -- |
| -- ware Foundation; either version 3, or (at your option) any later ver- -- |
| -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- |
| -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- |
| -- or FITNESS FOR A PARTICULAR PURPOSE. -- |
| -- -- |
| -- As a special exception under Section 7 of GPL version 3, you are granted -- |
| -- additional permissions described in the GCC Runtime Library Exception, -- |
| -- version 3.1, as published by the Free Software Foundation. -- |
| -- -- |
| -- You should have received a copy of the GNU General Public License and -- |
| -- a copy of the GCC Runtime Library Exception along with this program; -- |
| -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- |
| -- <http://www.gnu.org/licenses/>. -- |
| -- -- |
| -- GNAT was originally developed by the GNAT team at New York University. -- |
| -- Extensive contributions were provided by Ada Core Technologies Inc. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| -- This is the GNU/Linux specific version of this package |
| with Interfaces.C; use Interfaces.C; |
| |
| separate (System.Traceback.Symbolic) |
| |
| package body Module_Name is |
| |
| pragma Linker_Options ("-ldl"); |
| |
| function Is_Shared_Lib (Base : Address) return Boolean; |
| -- Returns True if a shared library |
| |
| -- The principle is: |
| |
| -- 1. We get information about the module containing the address. |
| |
| -- 2. We check that the full pathname is pointing to a shared library. |
| |
| -- 3. for shared libraries, we return the non relocated address (so |
| -- the absolute address in the shared library). |
| |
| -- 4. we also return the full pathname of the module containing this |
| -- address. |
| |
| ------------------- |
| -- Is_Shared_Lib -- |
| ------------------- |
| |
| function Is_Shared_Lib (Base : Address) return Boolean is |
| EI_NIDENT : constant := 16; |
| type u16 is mod 2 ** 16; |
| |
| -- Just declare the needed header information, we just need to read the |
| -- type encoded in the second field. |
| |
| type Elf32_Ehdr is record |
| e_ident : char_array (1 .. EI_NIDENT); |
| e_type : u16; |
| end record; |
| |
| ET_DYN : constant := 3; -- A shared lib if e_type = ET_DYN |
| |
| Header : Elf32_Ehdr; |
| pragma Import (Ada, Header); |
| -- Suppress initialization in Normalized_Scalars mode |
| for Header'Address use Base; |
| |
| begin |
| return Header.e_type = ET_DYN; |
| exception |
| when others => |
| return False; |
| end Is_Shared_Lib; |
| |
| --------------------------------- |
| -- Build_Cache_For_All_Modules -- |
| --------------------------------- |
| |
| procedure Build_Cache_For_All_Modules is |
| type link_map; |
| type link_map_acc is access all link_map; |
| pragma Convention (C, link_map_acc); |
| |
| type link_map is record |
| l_addr : Address; |
| -- Base address of the shared object |
| |
| l_name : Address; |
| -- Null-terminated absolute file name |
| |
| l_ld : Address; |
| -- Dynamic section |
| |
| l_next, l_prev : link_map_acc; |
| -- Chain |
| end record; |
| pragma Convention (C, link_map); |
| |
| type r_debug_type is record |
| r_version : Integer; |
| r_map : link_map_acc; |
| end record; |
| pragma Convention (C, r_debug_type); |
| |
| r_debug : r_debug_type; |
| pragma Import (C, r_debug, "_r_debug"); |
| |
| lm : link_map_acc; |
| begin |
| lm := r_debug.r_map; |
| while lm /= null loop |
| if Big_String_Conv.To_Pointer (lm.l_name) (1) /= ASCII.NUL then |
| -- Discard non-file (like the executable itself or the gate). |
| Add_Module_To_Cache (Value (lm.l_name), lm.l_addr); |
| end if; |
| lm := lm.l_next; |
| end loop; |
| end Build_Cache_For_All_Modules; |
| |
| --------- |
| -- Get -- |
| --------- |
| |
| function Get (Addr : System.Address; |
| Load_Addr : access System.Address) |
| return String |
| is |
| |
| -- Dl_info record for Linux, used to get sym reloc offset |
| |
| type Dl_info is record |
| dli_fname : System.Address; |
| dli_fbase : System.Address; |
| dli_sname : System.Address; |
| dli_saddr : System.Address; |
| end record; |
| |
| function dladdr |
| (addr : System.Address; |
| info : not null access Dl_info) return int; |
| pragma Import (C, dladdr, "dladdr"); |
| -- This is a Linux extension and not POSIX |
| |
| info : aliased Dl_info; |
| |
| begin |
| Load_Addr.all := System.Null_Address; |
| |
| if dladdr (Addr, info'Access) /= 0 then |
| |
| -- If we have a shared library we need to adjust the address to |
| -- be relative to the base address of the library. |
| |
| if Is_Shared_Lib (info.dli_fbase) then |
| Load_Addr.all := info.dli_fbase; |
| end if; |
| |
| return Value (info.dli_fname); |
| |
| -- Not found, fallback to executable name |
| |
| else |
| return ""; |
| end if; |
| |
| exception |
| when others => |
| return ""; |
| end Get; |
| |
| ------------------ |
| -- Is_Supported -- |
| ------------------ |
| |
| function Is_Supported return Boolean is |
| begin |
| return True; |
| end Is_Supported; |
| |
| end Module_Name; |
