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------------------------------------------------------------------------------
-- --
-- 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) 2012-2017, 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;
with System.Address_Operations; use System.Address_Operations;
separate (System.Traceback.Symbolic)
package body Module_Name is
use System;
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));
end if;
lm := lm.l_next;
end loop;
end Build_Cache_For_All_Modules;
---------
-- Get --
---------
function Get (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
if dladdr (Addr.all, 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
Addr.all := SubA (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;
|
