diff mbox series

[RFC,15/28] x86/sync_core: Use RIP-relative addressing

Message ID 20240925150059.3955569-45-ardb+git@google.com (mailing list archive)
State RFC, archived
Headers show
Series x86: Rely on toolchain for relocatable code | expand

Commit Message

Ard Biesheuvel Sept. 25, 2024, 3:01 p.m. UTC 
From: Ard Biesheuvel <ardb@kernel.org>

Use RIP-relative accesses and avoid fixups at runtime.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
 arch/x86/include/asm/sync_core.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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Patch

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");