support prelinked binaries

binfile.c

@@ -24,6 +24,7 @@ struct BinFile
     int         n_symbols;
     Symbol     *symbols;
     Symbol	undefined;
+    gulong      address;
 };
 
 static bfd *
@@ -277,6 +278,7 @@ read_symbols (BinFile *bf)
     int i;
     bfd *bfd;
     GArray *symbols;
+    asection *sec;
 
     bf->symbols = NULL;
     bf->n_symbols = 0;
@@ -299,6 +301,16 @@ read_symbols (BinFile *bf)
     if (!bfd_symbols)
 	return;
     
+    bf->address = 0xffffffff;
+    for (sec = bfd->sections; sec != NULL; sec = sec->next)
+    {
+	if (sec->flags & SEC_LOAD)
+	{
+	    if ((gulong)sec->vma < bf->address)
+		bf->address = sec->vma & ~4095;
+	}
+    }
+
     text_section = bfd_get_section_by_name (bfd, ".text");
     if (!text_section)
 	return;
@@ -362,6 +374,12 @@ bin_file_free (BinFile *bf)
     g_free (bf);
 }
 
+gulong
+bin_file_get_load_address (BinFile *bf)
+{
+  return bf->address;
+}
+
 const Symbol *
 bin_file_lookup_symbol (BinFile    *bf,
 			gulong     address)

binfile.h

@@ -12,6 +12,7 @@ BinFile *     bin_file_new           (const char *filename);
 void          bin_file_free          (BinFile    *bin_file);
 const Symbol *bin_file_lookup_symbol (BinFile    *bin_file,
 				      gulong      address);
+gulong        bin_file_get_load_address (BinFile *bf);
 
 /* Symbol */
 struct Symbol

process.c

@@ -48,6 +48,8 @@ initialize (void)
 static gboolean
 should_offset (const char *filename, int pid)
 {
+    return FALSE;
+
     gboolean result = TRUE;
     
     struct stat stat1, stat2;
@@ -266,11 +268,18 @@ process_lookup_symbol (Process *process, gulong address)
 	return &undefined;
     }
     
+    /* if (map->do_offset)
+	address -= map->start;
+    */
+
     if (!map->bin_file)
 	map->bin_file = bin_file_new (map->filename);
     
-    if (map->do_offset)
-	address -= map->start;
+    /* FIXME - this seems to work with prelinked binaries, but is
+     * it correct? IE., will normal binaries always have a preferred_addres of 0?
+     */
+    address -= map->start;
+    address += bin_file_get_load_address (map->bin_file);
 
     result = bin_file_lookup_symbol (map->bin_file, address);
     return result;

sysprof.c

@@ -119,7 +119,8 @@ on_read (gpointer data)
 	    filename = trace.filename;
 	
 	for (i = 0; i < trace.n_addresses; ++i)
-	    process_ensure_map (process, trace.pid, (gulong)trace.addresses[i]);
+	    process_ensure_map (process, trace.pid, 
+				(gulong)trace.addresses[i]);
 	g_assert (!app->generating_profile);
 	
 	stack_stash_add_trace (