linux-kernel - [PATCH 12/14] x86: Hacks for hacked up llvm

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Message-Id: <20240927194925.603504509@infradead.org>
Date: Fri, 27 Sep 2024 21:49:08 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
 peterz@...radead.org,
 alyssa.milburn@...el.com,
 scott.d.constable@...el.com,
 joao@...rdrivepizza.com,
 andrew.cooper3@...rix.com,
 jpoimboe@...nel.org,
 jose.marchesi@...cle.com,
 hjl.tools@...il.com,
 ndesaulniers@...gle.com,
 samitolvanen@...gle.com,
 nathan@...nel.org,
 ojeda@...nel.org,
 kees@...nel.org,
 alexei.starovoitov@...il.com
Subject: [PATCH 12/14] x86: Hacks for hacked up llvm

XXX do this nicely once the llvm hacks are done nice

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/Kconfig               |    8 ++++----
 arch/x86/include/asm/linkage.h |    2 ++
 2 files changed, 6 insertions(+), 4 deletions(-)

--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2444,10 +2444,10 @@ config CC_HAS_ENTRY_PADDING
 
 config FUNCTION_PADDING_CFI
 	int
-	default 59 if FUNCTION_ALIGNMENT_64B
-	default 27 if FUNCTION_ALIGNMENT_32B
-	default 11 if FUNCTION_ALIGNMENT_16B
-	default  3 if FUNCTION_ALIGNMENT_8B
+	default 57 if FUNCTION_ALIGNMENT_64B
+	default 25 if FUNCTION_ALIGNMENT_32B
+	default  9 if FUNCTION_ALIGNMENT_16B
+	default  1 if FUNCTION_ALIGNMENT_8B
 	default  0
 
 # Basically: FUNCTION_ALIGNMENT - 5*CFI_CLANG
--- a/arch/x86/include/asm/linkage.h
+++ b/arch/x86/include/asm/linkage.h
@@ -102,6 +102,8 @@
 	CFI_PRE_PADDING						\
 	.byte 0xb8 ASM_NL					\
 	.long __kcfi_typeid_##name ASM_NL			\
+	.byte 0xb0 ASM_NL					\
+	.byte 0x7f ASM_NL					\
 	CFI_POST_PADDING					\
 	SYM_FUNC_END(__cfi_##name)