objtool: Handle calling non-function symbols in other sections

Relocation for a call destination could point to a symbol that has
type STT_NOTYPE.

Lookup such a symbol when no function is available.

Signed-off-by: Julien Thierry <jthierry@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index cd7c669..a4796e3 100644 (file)
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -815,6 +815,17 @@ static void remove_insn_ops(struct instruction *insn)
        }
 }
 
+static struct symbol *find_call_destination(struct section *sec, unsigned long offset)
+{
+       struct symbol *call_dest;
+
+       call_dest = find_func_by_offset(sec, offset);
+       if (!call_dest)
+               call_dest = find_symbol_by_offset(sec, offset);
+
+       return call_dest;
+}
+
 /*
  * Find the destination instructions for all calls.
  */
@@ -832,9 +843,7 @@ static int add_call_destinations(struct objtool_file *file)
                                               insn->offset, insn->len);
                if (!reloc) {
                        dest_off = arch_jump_destination(insn);
-                       insn->call_dest = find_func_by_offset(insn->sec, dest_off);
-                       if (!insn->call_dest)
-                               insn->call_dest = find_symbol_by_offset(insn->sec, dest_off);
+                       insn->call_dest = find_call_destination(insn->sec, dest_off);
 
                        if (insn->ignore)
                                continue;
@@ -852,8 +861,8 @@ static int add_call_destinations(struct objtool_file *file)
 
                } else if (reloc->sym->type == STT_SECTION) {
                        dest_off = arch_dest_reloc_offset(reloc->addend);
-                       insn->call_dest = find_func_by_offset(reloc->sym->sec,
-                                                             dest_off);
+                       insn->call_dest = find_call_destination(reloc->sym->sec,
+                                                               dest_off);
                        if (!insn->call_dest) {
                                WARN_FUNC("can't find call dest symbol at %s+0x%lx",
                                          insn->sec, insn->offset,