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Diffstat (limited to 'tools/objtool/builtin-check.c')
-rw-r--r--tools/objtool/builtin-check.c46
1 files changed, 32 insertions, 14 deletions
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 157a0f96d64d..e8a1e69eb92c 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -54,6 +54,7 @@ struct instruction {
struct symbol *call_dest;
struct instruction *jump_dest;
struct list_head alts;
+ struct symbol *func;
};
struct alternative {
@@ -66,7 +67,7 @@ struct objtool_file {
struct list_head insn_list;
DECLARE_HASHTABLE(insn_hash, 16);
struct section *rodata, *whitelist;
- bool ignore_unreachables;
+ bool ignore_unreachables, c_file;
};
const char *objname;
@@ -229,7 +230,7 @@ static int __dead_end_function(struct objtool_file *file, struct symbol *func,
}
}
- if (insn->type == INSN_JUMP_DYNAMIC)
+ if (insn->type == INSN_JUMP_DYNAMIC && list_empty(&insn->alts))
/* sibling call */
return 0;
}
@@ -249,6 +250,7 @@ static int dead_end_function(struct objtool_file *file, struct symbol *func)
static int decode_instructions(struct objtool_file *file)
{
struct section *sec;
+ struct symbol *func;
unsigned long offset;
struct instruction *insn;
int ret;
@@ -282,6 +284,21 @@ static int decode_instructions(struct objtool_file *file)
hash_add(file->insn_hash, &insn->hash, insn->offset);
list_add_tail(&insn->list, &file->insn_list);
}
+
+ list_for_each_entry(func, &sec->symbol_list, list) {
+ if (func->type != STT_FUNC)
+ continue;
+
+ if (!find_insn(file, sec, func->offset)) {
+ WARN("%s(): can't find starting instruction",
+ func->name);
+ return -1;
+ }
+
+ func_for_each_insn(file, func, insn)
+ if (!insn->func)
+ insn->func = func;
+ }
}
return 0;
@@ -824,6 +841,7 @@ static int validate_branch(struct objtool_file *file,
struct alternative *alt;
struct instruction *insn;
struct section *sec;
+ struct symbol *func = NULL;
unsigned char state;
int ret;
@@ -838,6 +856,16 @@ static int validate_branch(struct objtool_file *file,
}
while (1) {
+ if (file->c_file && insn->func) {
+ if (func && func != insn->func) {
+ WARN("%s() falls through to next function %s()",
+ func->name, insn->func->name);
+ return 1;
+ }
+
+ func = insn->func;
+ }
+
if (insn->visited) {
if (frame_state(insn->state) != frame_state(state)) {
WARN_FUNC("frame pointer state mismatch",
@@ -848,13 +876,6 @@ static int validate_branch(struct objtool_file *file,
return 0;
}
- /*
- * Catch a rare case where a noreturn function falls through to
- * the next function.
- */
- if (is_fentry_call(insn) && (state & STATE_FENTRY))
- return 0;
-
insn->visited = true;
insn->state = state;
@@ -1060,12 +1081,8 @@ static int validate_functions(struct objtool_file *file)
continue;
insn = find_insn(file, sec, func->offset);
- if (!insn) {
- WARN("%s(): can't find starting instruction",
- func->name);
- warnings++;
+ if (!insn)
continue;
- }
ret = validate_branch(file, insn, 0);
warnings += ret;
@@ -1162,6 +1179,7 @@ int cmd_check(int argc, const char **argv)
file.whitelist = find_section_by_name(file.elf, "__func_stack_frame_non_standard");
file.rodata = find_section_by_name(file.elf, ".rodata");
file.ignore_unreachables = false;
+ file.c_file = find_section_by_name(file.elf, ".comment");
ret = decode_sections(&file);
if (ret < 0)