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objtool: Do frame pointer check before dead end check

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Even calls to __noreturn functions need the frame pointer setup first.
Such functions often dump the stack.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/aed62fbd60e239280218be623f751a433658e896.1563413318.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2019-07-17 20:36:51 -05:00 committed by Thomas Gleixner
parent 8e25c9f8b4
commit c9bab22bc4
1 changed files with 9 additions and 9 deletions
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18
tools/objtool/check.c
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@ -133,6 +133,9 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
"rewind_stack_do_exit",
};
if (!func)
return false;
if (func->bind == STB_WEAK)
return false;
@ -2071,19 +2074,16 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
if (ret)
return ret;
if (insn->type == INSN_CALL) {
if (is_fentry_call(insn))
break;
if (dead_end_function(file, insn->call_dest))
return 0;
}
if (!no_fp && func && !has_valid_stack_frame(&state)) {
if (!no_fp && func && !is_fentry_call(insn) &&
!has_valid_stack_frame(&state)) {
WARN_FUNC("call without frame pointer save/setup",
sec, insn->offset);
return 1;
}
if (dead_end_function(file, insn->call_dest))
return 0;
break;
case INSN_JUMP_CONDITIONAL: