For most sibling calls, 'jump_dest' is NULL because objtool treats the
jump like a call and sets 'call_dest'. But there are a few edge cases
where that's not true. Make it consistent to avoid unexpected behavior.
Signed-off-by: Josh Poimboeuf <[email protected]>
---
tools/objtool/check.c | 35 ++++++++++++++++++++++-------------
1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index bd0c2c828940..6f492789c8c0 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1271,7 +1271,7 @@ static bool is_first_func_insn(struct objtool_file *file, struct instruction *in
*/
static int add_jump_destinations(struct objtool_file *file)
{
- struct instruction *insn;
+ struct instruction *insn, *jump_dest;
struct reloc *reloc;
struct section *dest_sec;
unsigned long dest_off;
@@ -1291,7 +1291,10 @@ static int add_jump_destinations(struct objtool_file *file)
add_retpoline_call(file, insn);
continue;
} else if (insn->func) {
- /* internal or external sibling call (with reloc) */
+ /*
+ * External sibling call or internal sibling call with
+ * STT_FUNC reloc.
+ */
add_call_dest(file, insn, reloc->sym, true);
continue;
} else if (reloc->sym->sec->idx) {
@@ -1303,8 +1306,8 @@ static int add_jump_destinations(struct objtool_file *file)
continue;
}
- insn->jump_dest = find_insn(file, dest_sec, dest_off);
- if (!insn->jump_dest) {
+ jump_dest = find_insn(file, dest_sec, dest_off);
+ if (!jump_dest) {
/*
* This is a special case where an alt instruction
@@ -1323,8 +1326,8 @@ static int add_jump_destinations(struct objtool_file *file)
/*
* Cross-function jump.
*/
- if (insn->func && insn->jump_dest->func &&
- insn->func != insn->jump_dest->func) {
+ if (insn->func && jump_dest->func &&
+ insn->func != jump_dest->func) {
/*
* For GCC 8+, create parent/child links for any cold
@@ -1342,16 +1345,22 @@ static int add_jump_destinations(struct objtool_file *file)
* subfunction is through a jump table.
*/
if (!strstr(insn->func->name, ".cold") &&
- strstr(insn->jump_dest->func->name, ".cold")) {
- insn->func->cfunc = insn->jump_dest->func;
- insn->jump_dest->func->pfunc = insn->func;
+ strstr(jump_dest->func->name, ".cold")) {
+ insn->func->cfunc = jump_dest->func;
+ jump_dest->func->pfunc = insn->func;
- } else if (!same_function(insn, insn->jump_dest) &&
- is_first_func_insn(file, insn->jump_dest)) {
- /* internal sibling call (without reloc) */
- add_call_dest(file, insn, insn->jump_dest->func, true);
+ } else if (!same_function(insn, jump_dest) &&
+ is_first_func_insn(file, jump_dest)) {
+ /*
+ * Internal sibling call without reloc or with
+ * STT_SECTION reloc.
+ */
+ add_call_dest(file, insn, jump_dest->func, true);
+ continue;
}
}
+
+ insn->jump_dest = jump_dest;
}
return 0;
--
2.34.1
The following commit has been merged into the objtool/urgent branch of tip:
Commit-ID: 26ff604102c98df79c3fe2614d1b9bb068d4c28c
Gitweb: https://git.kernel.org/tip/26ff604102c98df79c3fe2614d1b9bb068d4c28c
Author: Josh Poimboeuf <[email protected]>
AuthorDate: Mon, 11 Apr 2022 16:10:30 -07:00
Committer: Peter Zijlstra <[email protected]>
CommitterDate: Tue, 19 Apr 2022 21:58:53 +02:00
objtool: Don't set 'jump_dest' for sibling calls
For most sibling calls, 'jump_dest' is NULL because objtool treats the
jump like a call and sets 'call_dest'. But there are a few edge cases
where that's not true. Make it consistent to avoid unexpected behavior.
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/8737d6b9d1691831aed73375f444f0f42da3e2c9.1649718562.git.jpoimboe@redhat.com
---
tools/objtool/check.c | 35 ++++++++++++++++++++++-------------
1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index bd0c2c8..6f49278 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -1271,7 +1271,7 @@ static bool is_first_func_insn(struct objtool_file *file, struct instruction *in
*/
static int add_jump_destinations(struct objtool_file *file)
{
- struct instruction *insn;
+ struct instruction *insn, *jump_dest;
struct reloc *reloc;
struct section *dest_sec;
unsigned long dest_off;
@@ -1291,7 +1291,10 @@ static int add_jump_destinations(struct objtool_file *file)
add_retpoline_call(file, insn);
continue;
} else if (insn->func) {
- /* internal or external sibling call (with reloc) */
+ /*
+ * External sibling call or internal sibling call with
+ * STT_FUNC reloc.
+ */
add_call_dest(file, insn, reloc->sym, true);
continue;
} else if (reloc->sym->sec->idx) {
@@ -1303,8 +1306,8 @@ static int add_jump_destinations(struct objtool_file *file)
continue;
}
- insn->jump_dest = find_insn(file, dest_sec, dest_off);
- if (!insn->jump_dest) {
+ jump_dest = find_insn(file, dest_sec, dest_off);
+ if (!jump_dest) {
/*
* This is a special case where an alt instruction
@@ -1323,8 +1326,8 @@ static int add_jump_destinations(struct objtool_file *file)
/*
* Cross-function jump.
*/
- if (insn->func && insn->jump_dest->func &&
- insn->func != insn->jump_dest->func) {
+ if (insn->func && jump_dest->func &&
+ insn->func != jump_dest->func) {
/*
* For GCC 8+, create parent/child links for any cold
@@ -1342,16 +1345,22 @@ static int add_jump_destinations(struct objtool_file *file)
* subfunction is through a jump table.
*/
if (!strstr(insn->func->name, ".cold") &&
- strstr(insn->jump_dest->func->name, ".cold")) {
- insn->func->cfunc = insn->jump_dest->func;
- insn->jump_dest->func->pfunc = insn->func;
+ strstr(jump_dest->func->name, ".cold")) {
+ insn->func->cfunc = jump_dest->func;
+ jump_dest->func->pfunc = insn->func;
- } else if (!same_function(insn, insn->jump_dest) &&
- is_first_func_insn(file, insn->jump_dest)) {
- /* internal sibling call (without reloc) */
- add_call_dest(file, insn, insn->jump_dest->func, true);
+ } else if (!same_function(insn, jump_dest) &&
+ is_first_func_insn(file, jump_dest)) {
+ /*
+ * Internal sibling call without reloc or with
+ * STT_SECTION reloc.
+ */
+ add_call_dest(file, insn, jump_dest->func, true);
+ continue;
}
}
+
+ insn->jump_dest = jump_dest;
}
return 0;