| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <tip-372474e12a858807f03f73cb30e830a76fd1ae07@git.kernel.org> Date: Wed, 20 Nov 2013 12:54:35 -0800 From: "tip-bot for H. Peter Anvin" <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, torvalds@...ux-foundation.org, fenghua.yu@...el.com, tglx@...utronix.de, hpa@...ux.intel.com Subject: [tip:x86/asm] x86-64, copy_user: Use leal to produce 32-bit results Commit-ID: 372474e12a858807f03f73cb30e830a76fd1ae07 Gitweb: http://git.kernel.org/tip/372474e12a858807f03f73cb30e830a76fd1ae07 Author: H. Peter Anvin <hpa@...ux.intel.com> AuthorDate: Wed, 20 Nov 2013 12:50:51 -0800 Committer: H. Peter Anvin <hpa@...ux.intel.com> CommitDate: Wed, 20 Nov 2013 12:50:51 -0800 x86-64, copy_user: Use leal to produce 32-bit results When we are using lea to produce a 32-bit result, we can use the leal form, rather than using leaq and worry about truncation elsewhere. Cc: Fenghua Yu <fenghua.yu@...el.com> Cc: Linus Torvalds <torvalds@...ux-foundation.org> Link: http://lkml.kernel.org/r/1384634221-6006-1-git-send-email-fenghua.yu@intel.com Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com> --- arch/x86/lib/copy_user_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S index ffe4eb9..f00a87c 100644 --- a/arch/x86/lib/copy_user_64.S +++ b/arch/x86/lib/copy_user_64.S @@ -186,7 +186,7 @@ ENTRY(copy_user_generic_unrolled) 30: shll $6,%ecx addl %ecx,%edx jmp 60f -40: lea (%rdx,%rcx,8),%rdx +40: lea (%rdx,%rcx,8),%edx jmp 60f 50: movl %ecx,%edx 60: jmp copy_user_handle_tail /* ecx is zerorest also */ @@ -252,7 +252,7 @@ ENTRY(copy_user_generic_string) ret .section .fixup,"ax" -11: lea (%rdx,%rcx,8),%rcx +11: lea (%rdx,%rcx,8),%ecx 12: movl %ecx,%edx /* ecx is zerorest also */ jmp copy_user_handle_tail .previous -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists