Implement R_PDB loading in bfd

We disable symbol_file_add_separate for now so the old symbol loading
still works.

bfd/Makefile.in

@@ -210,7 +210,7 @@ AM_V_at = $(am__v_at_@AM_V@)
 am__v_at_ = $(am__v_at_@AM_DEFAULT_V@)
 am__v_at_0 = @
 am__v_at_1 = 
-DEFAULT_INCLUDES = -I.@am__isrc@
+DEFAULT_INCLUDES = -I.@am__isrc@ -I/usr/include/libr
 depcomp = $(SHELL) $(top_srcdir)/../depcomp
 am__depfiles_maybe = depfiles
 am__mv = mv -f

bfd/pdb.c

@@ -6,7 +6,7 @@
 bfd_boolean
 bfd_pdb_close_and_cleanup (bfd *abfd)
 {
-  return FALSE;
+  return TRUE;
 }
 
 /* Ask the BFD to free all cached information.  */
@@ -89,9 +89,51 @@ bfd_pdb_find_nearest_line (bfd *abfd,
 #define bfd_pdb_read_minisymbols _bfd_generic_read_minisymbols
 #define bfd_pdb_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 
+static st64
+r_buffer_read (RBuffer *buffer, ut8 *out, ut64 length)
+{
+  bfd *abfd = buffer->priv;
+  return abfd->iovec->bread (abfd, out, length);
+}
+
+static st64
+r_buffer_seek (RBuffer *buffer, st64 address, int whence)
+{
+  bfd *abfd = buffer->priv;
+  return abfd->iovec->bseek (abfd, address, whence);
+}
+
+static bfd_pdb_data_struct *
+get_bfd_pdb_data (bfd *abfd)
+{
+  RBufferMethods *buffer_methods = bfd_zalloc (abfd, sizeof (RBufferMethods));
+  buffer_methods->read = &r_buffer_read;
+  buffer_methods->seek = &r_buffer_seek;
+
+  RBuffer *r_buffer = bfd_zalloc (abfd, sizeof (RBuffer));
+  r_buffer->methods = buffer_methods;
+  r_buffer->priv = abfd;
+  r_buffer->readonly = TRUE;
+
+  R_PDB *pdb = bfd_zalloc (abfd, sizeof (R_PDB));
+  if (init_pdb_parser_with_buf (pdb, r_buffer))
+    {
+      bfd_pdb_data_struct *result = bfd_alloc (abfd, sizeof (bfd_pdb_data_struct));
+      result->pdb = pdb;
+      return result;
+    }
+
+  return NULL;
+}
+
 const bfd_target *
 bfd_pdb_check_format (bfd *abfd)
 {
+  if ((abfd->tdata.pdb_data = get_bfd_pdb_data (abfd)))
+    {
+      return abfd->xvec;
+    }
+
   bfd_set_error (bfd_error_wrong_format);
   return NULL;
 }

bfd/pdb.h

@@ -2,4 +2,11 @@
 
 #include "sysdep.h"
 #include "bfd.h"
-#include "libbfd.h"
+#include "libbfd.h"
+
+#include <libr/r_pdb.h>
+
+typedef struct pdb_data_struct
+{
+  R_PDB* pdb;
+} bfd_pdb_data_struct;

gdb/coffread.c

@@ -732,8 +732,8 @@ coff_symfile_read (struct objfile *objfile, symfile_add_flags symfile_flags)
           gdb_bfd_ref_ptr debug_bfd (try_load_pdb_bfd (objfile));
           if (debug_bfd.get ())
             {
-              symbol_file_add_separate (debug_bfd.get (), debug_bfd->filename,
-                                        symfile_flags, objfile);
+              //symbol_file_add_separate (debug_bfd.get (), debug_bfd->filename,
+              //                          symfile_flags, objfile);
             }
         }
     }

gdb/pdb.c

@@ -238,7 +238,7 @@ get_pdb_paths (struct objfile *objfile)
 
   auto codeview_pdb_path = get_codeview_pdb_path (objfile);
   if (!codeview_pdb_path)
-    return paths;
+    return paths; //if there is no CodeView PDB path, we assume no PDB exists
 
   paths.push_back (*codeview_pdb_path);
   paths.push_back ("target:" + *codeview_pdb_path);