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a=openpgp-sha256; l=715; i=ardb@kernel.org; h=from:subject; bh=MI3z3hAzDWNLGP+bB6WD9qNMTMv7yb8jTXTlUIfHWCE=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIe2L6sHwPz3fHPWC8oK2RzHe5nszs/XmM4NX7P1ae3YFv bWd+fJLRykLgxgHg6yYIovA7L/vdp6eKFXrPEsWZg4rE8gQBi5OAZjI/9UMfwVfxZ9hrm+9xvze 6zfvw/cKoUe5Kv5w1pmKsYfxH/f4do3hf+75iD2ndC64zYjxsFPZpbpKIrxBk/fzstDCxW8eO9h OYgAA X-Mailer: git-send-email 2.46.0.792.g87dc391469-goog Message-ID: <20240925150059.3955569-45-ardb+git@google.com> Subject: [RFC PATCH 15/28] x86/sync_core: Use RIP-relative addressing From: Ard Biesheuvel To: linux-kernel@vger.kernel.org Cc: Ard Biesheuvel , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Uros Bizjak , Dennis Zhou , Tejun Heo , Christoph Lameter , Mathieu Desnoyers , Paolo Bonzini , Vitaly Kuznetsov , Juergen Gross , Boris Ostrovsky , Greg Kroah-Hartman , Arnd Bergmann , Masahiro Yamada , Kees Cook , Nathan Chancellor , Keith Packard , Justin Stitt , Josh Poimboeuf , Arnaldo Carvalho de Melo , Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , linux-doc@vger.kernel.org, linux-pm@vger.kernel.org, kvm@vger.kernel.org, xen-devel@lists.xenproject.org, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, linux-sparse@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-perf-users@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev From: Ard Biesheuvel Use RIP-relative accesses and avoid fixups at runtime. Signed-off-by: Ard Biesheuvel --- 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");