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Message-ID: <20240925150059.3955569-45-ardb+git@google.com>
Date: Wed, 25 Sep 2024 17:01:15 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: Ard Biesheuvel <ardb@...nel.org>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Uros Bizjak <ubizjak@...il.com>,
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Subject: [RFC PATCH 15/28] x86/sync_core: Use RIP-relative addressing
From: Ard Biesheuvel <ardb@...nel.org>
Use RIP-relative accesses and avoid fixups at runtime.
Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
arch/x86/include/asm/sync_core.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/sync_core.h b/arch/x86/include/asm/sync_core.h
index ab7382f92aff..cfd2f3bca83b 100644
--- a/arch/x86/include/asm/sync_core.h
+++ b/arch/x86/include/asm/sync_core.h
@@ -31,7 +31,8 @@ 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");
--
2.46.0.792.g87dc391469-goog
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