The following commit has been merged into the objtool/core branch of tip:
Commit-ID: 2b232a22d8225df419a92ca69ddeeb4e5fe902f7
Gitweb:
https://git.kernel.org/tip/2b232a22d8225df419a92ca69ddeeb4e5fe902f7
Author: Julien Thierry <jthie...@redhat.com>
AuthorDate: Tue, 15 Sep 2020 08:53:18 +01:00
Committer: Josh Poimboeuf <jpoim...@redhat.com>
CommitterDate: Mon, 21 Sep 2020 10:17:36 -05:00
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 <jthie...@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoim...@redhat.com>
---
tools/objtool/check.c | 19 ++++++++++++++-----
1 file changed, 14 insertions(+), 5 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index cd7c669..a4796e3 100644
--- 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,
