linux-kernel - [PATCH RFC 06/43] x86/CPU: Adapt assembly for PIE support

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Message-Id: <86defd5e8ee1328bbfbe7f6b293bacb4f1b7d23a.1682673543.git.houwenlong.hwl@antgroup.com>
Date:   Fri, 28 Apr 2023 17:50:46 +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>
Subject: [PATCH RFC 06/43] x86/CPU: Adapt assembly for PIE support

From: Thomas Garnier <thgarnie@...omium.org>

From: Thomas Garnier <thgarnie@...omium.org>

Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible.

Signed-off-by: Thomas Garnier <thgarnie@...omium.org>
Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>
Cc: Lai Jiangshan <jiangshan.ljs@...group.com>
Cc: Kees Cook <keescook@...omium.org>
---
 arch/x86/include/asm/sync_core.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/sync_core.h b/arch/x86/include/asm/sync_core.h
index ab7382f92aff..fa5b1fe1a692 100644
--- a/arch/x86/include/asm/sync_core.h
+++ b/arch/x86/include/asm/sync_core.h
@@ -31,10 +31,12 @@ static inline void iret_to_self(void)
 		"pushfq\n\t"
 		"mov %%cs, %0\n\t"
 		"pushq %q0\n\t"
-		"pushq $1f\n\t"
+		"leaq 1f(%%rip), %q0\n\t"
+		"pushq %q0\n\t"
 		"iretq\n\t"
 		"1:"
-		: "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc", "memory");
+		: "=&r" (tmp), ASM_CALL_CONSTRAINT
+		: : "cc", "memory");
 }
 #endif /* CONFIG_X86_32 */
 
-- 
2.31.1