linux-kernel - [PATCH RFC 11/43] x86/irq: Adapt assembly for PIE support

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Message-Id: <38061a9bfc6f4a6b4bd9737d45ce4f551849ed08.1682673543.git.houwenlong.hwl@antgroup.com>
Date:   Fri, 28 Apr 2023 17:50:51 +0800
From:   "Hou Wenlong" <houwenlong.hwl@...group.com>
To:     linux-kernel@...r.kernel.org
Cc:     "Thomas Garnier" <thgarnie@...omium.org>,
        "Lai Jiangshan" <jiangshan.ljs@...group.com>,
        "Kees Cook" <keescook@...omium.org>,
        "Hou Wenlong" <houwenlong.hwl@...group.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Ingo Molnar" <mingo@...hat.com>, "Borislav Petkov" <bp@...en8.de>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Sebastian Andrzej Siewior" <bigeasy@...utronix.de>,
        "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH RFC 11/43] x86/irq: Adapt assembly for PIE support

Change the assembly options to work with pointers instead of integers.
The generated code is the same PIE just ensures input is a pointer.

Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
Cc: Thomas Garnier <thgarnie@...omium.org>
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>
Cc: Kees Cook <keescook@...omium.org>
---
 arch/x86/include/asm/irq_stack.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/irq_stack.h b/arch/x86/include/asm/irq_stack.h
index 798183867d78..caba5d1d0800 100644
--- a/arch/x86/include/asm/irq_stack.h
+++ b/arch/x86/include/asm/irq_stack.h
@@ -93,7 +93,7 @@
 	"popq	%%rsp					\n"		\
 									\
 	: "+r" (tos), ASM_CALL_CONSTRAINT				\
-	: [__func] "i" (func), [tos] "r" (tos) argconstr		\
+	: [__func] "X" (func), [tos] "r" (tos) argconstr		\
 	: "cc", "rax", "rcx", "rdx", "rsi", "rdi", "r8", "r9", "r10",	\
 	  "memory"							\
 	);								\
-- 
2.31.1