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[RFC PATCH 15/28] x86/sync_core: Use RIP-relative addressing
- To: linux-kernel@xxxxxxxxxxxxxxx
- From: Ard Biesheuvel <ardb+git@xxxxxxxxxx>
- Date: Wed, 25 Sep 2024 17:01:15 +0200
- Cc: Ard Biesheuvel <ardb@xxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Uros Bizjak <ubizjak@xxxxxxxxx>, Dennis Zhou <dennis@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Christoph Lameter <cl@xxxxxxxxx>, Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Masahiro Yamada <masahiroy@xxxxxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Nathan Chancellor <nathan@xxxxxxxxxx>, Keith Packard <keithp@xxxxxxxxxx>, Justin Stitt <justinstitt@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Jiri Olsa <jolsa@xxxxxxxxxx>, Ian Rogers <irogers@xxxxxxxxxx>, Adrian Hunter <adrian.hunter@xxxxxxxxx>, Kan Liang <kan.liang@xxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-arch@xxxxxxxxxxxxxxx, linux-sparse@xxxxxxxxxxxxxxx, linux-kbuild@xxxxxxxxxxxxxxx, linux-perf-users@xxxxxxxxxxxxxxx, rust-for-linux@xxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 25 Sep 2024 15:14:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
From: Ard Biesheuvel <ardb@xxxxxxxxxx>
Use RIP-relative accesses and avoid fixups at runtime.
Signed-off-by: Ard Biesheuvel <ardb@xxxxxxxxxx>
---
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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