releases/5.10.192/objtool-add-frame-pointer-specific-function-ignore.patch

From 88b19a0e5cbc59720e4c808689ea87c3fa140acf Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Tue, 14 Sep 2021 23:41:13 +0900
Subject: objtool: Add frame-pointer-specific function ignore

From: Josh Poimboeuf <jpoimboe@redhat.com>

[ Upstream commit e028c4f7ac7ca8c96126fe46c54ab3d56ffe6a66 ]

Add a CONFIG_FRAME_POINTER-specific version of
STACK_FRAME_NON_STANDARD() for the case where a function is
intentionally missing frame pointer setup, but otherwise needs
objtool/ORC coverage when frame pointers are disabled.

Link: https://lkml.kernel.org/r/163163047364.489837.17377799909553689661.stgit@devnote2

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Stable-dep-of: c8c301abeae5 ("x86/ibt: Add ANNOTATE_NOENDBR")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/linux/objtool.h       |   12 ++++++++++++
 tools/include/linux/objtool.h |   12 ++++++++++++
 2 files changed, 24 insertions(+)

--- a/include/linux/objtool.h
+++ b/include/linux/objtool.h
@@ -71,6 +71,17 @@ struct unwind_hint {
 	static void __used __section(".discard.func_stack_frame_non_standard") \
 		*__func_stack_frame_non_standard_##func = func
 
+/*
+ * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore
+ * for the case where a function is intentionally missing frame pointer setup,
+ * but otherwise needs objtool/ORC coverage when frame pointers are disabled.
+ */
+#ifdef CONFIG_FRAME_POINTER
+#define STACK_FRAME_NON_STANDARD_FP(func) STACK_FRAME_NON_STANDARD(func)
+#else
+#define STACK_FRAME_NON_STANDARD_FP(func)
+#endif
+
 #else /* __ASSEMBLY__ */
 
 /*
@@ -126,6 +137,7 @@ struct unwind_hint {
 #define UNWIND_HINT(sp_reg, sp_offset, type, end)	\
 	"\n\t"
 #define STACK_FRAME_NON_STANDARD(func)
+#define STACK_FRAME_NON_STANDARD_FP(func)
 #else
 #define ANNOTATE_INTRA_FUNCTION_CALL
 .macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 end=0
--- a/tools/include/linux/objtool.h
+++ b/tools/include/linux/objtool.h
@@ -71,6 +71,17 @@ struct unwind_hint {
 	static void __used __section(".discard.func_stack_frame_non_standard") \
 		*__func_stack_frame_non_standard_##func = func
 
+/*
+ * STACK_FRAME_NON_STANDARD_FP() is a frame-pointer-specific function ignore
+ * for the case where a function is intentionally missing frame pointer setup,
+ * but otherwise needs objtool/ORC coverage when frame pointers are disabled.
+ */
+#ifdef CONFIG_FRAME_POINTER
+#define STACK_FRAME_NON_STANDARD_FP(func) STACK_FRAME_NON_STANDARD(func)
+#else
+#define STACK_FRAME_NON_STANDARD_FP(func)
+#endif
+
 #else /* __ASSEMBLY__ */
 
 /*
@@ -126,6 +137,7 @@ struct unwind_hint {
 #define UNWIND_HINT(sp_reg, sp_offset, type, end)	\
 	"\n\t"
 #define STACK_FRAME_NON_STANDARD(func)
+#define STACK_FRAME_NON_STANDARD_FP(func)
 #else
 #define ANNOTATE_INTRA_FUNCTION_CALL
 .macro UNWIND_HINT type:req sp_reg=0 sp_offset=0 end=0