linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Andi Kleen <andi@firstfloor.org>
To: x86@kernel.org
Cc: luto@amacapital.net, linux-kernel@vger.kernel.org,
	Andi Kleen <ak@linux.intel.com>
Subject: [PATCH 1/9] x86: Add intrinsics/macros for new rd/wr fs/gs base instructions
Date: Mon, 21 Mar 2016 09:16:01 -0700	[thread overview]
Message-ID: <1458576969-13309-2-git-send-email-andi@firstfloor.org> (raw)
In-Reply-To: <1458576969-13309-1-git-send-email-andi@firstfloor.org>

From: Andi Kleen <ak@linux.intel.com>

Add C intrinsics and assembler macros for the new rd/wr fs/gs base
instructions and for swapgs.

Very straight forward. Used in followon patch.

For assembler only a few standard registers used by entry_64.S
are defined.

v2: Use __always_inline
Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 arch/x86/include/asm/fsgs.h | 54 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 arch/x86/include/asm/fsgs.h

diff --git a/arch/x86/include/asm/fsgs.h b/arch/x86/include/asm/fsgs.h
new file mode 100644
index 0000000..8a9f900
--- /dev/null
+++ b/arch/x86/include/asm/fsgs.h
@@ -0,0 +1,54 @@
+#ifndef _ASM_FSGS_H
+#define _ASM_FSGS_H 1
+
+#ifndef __ASSEMBLY__
+
+static __always_inline void swapgs(void)
+{
+	asm volatile("swapgs" ::: "memory");
+}
+
+/* Must be protected by X86_FEATURE_FSGSBASE check. */
+
+static __always_inline unsigned long rdgsbase(void)
+{
+	unsigned long gs;
+	asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xc8 # rdgsbaseq %%rax"
+			: "=a" (gs)
+			:: "memory");
+	return gs;
+}
+
+static __always_inline unsigned long rdfsbase(void)
+{
+	unsigned long fs;
+	asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xc0 # rdfsbaseq %%rax"
+			: "=a" (fs)
+			:: "memory");
+	return fs;
+}
+
+static __always_inline void wrgsbase(unsigned long gs)
+{
+	asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xd8 # wrgsbaseq %%rax"
+			:: "a" (gs)
+			: "memory");
+}
+
+static __always_inline void wrfsbase(unsigned long fs)
+{
+	asm volatile(".byte 0xf3,0x48,0x0f,0xae,0xd0 # wrfsbaseq %%rax"
+			:: "a" (fs)
+			: "memory");
+}
+
+#else
+
+/* Handle old assemblers. */
+#define RDGSBASE_R15 .byte 0xf3,0x49,0x0f,0xae,0xcf
+#define WRGSBASE_RDI .byte 0xf3,0x48,0x0f,0xae,0xdf
+#define WRGSBASE_R15 .byte 0xf3,0x49,0x0f,0xae,0xdf
+
+#endif /* __ASSEMBLY__ */
+
+#endif
-- 
2.5.5

  reply	other threads:[~2016-03-21 16:18 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-21 16:16 Updated version of RD/WR FS/GS BASE patchkit Andi Kleen
2016-03-21 16:16 ` Andi Kleen [this message]
2016-03-21 18:14   ` [PATCH 1/9] x86: Add intrinsics/macros for new rd/wr fs/gs base instructions Andy Lutomirski
2016-03-21 16:16 ` [PATCH 2/9] x86: Add support for rd/wr fs/gs base Andi Kleen
2016-03-21 18:13   ` Andy Lutomirski
2016-03-21 19:05     ` Andi Kleen
2016-03-21 19:22       ` Andy Lutomirski
2016-03-21 22:05     ` Andi Kleen
2016-03-21 22:08       ` Andy Lutomirski
2016-03-21 22:15         ` Andi Kleen
2016-03-22  8:36           ` Thomas Gleixner
2016-03-22 14:40           ` Brian Gerst
2016-04-15  0:06   ` Andy Lutomirski
2016-03-21 16:16 ` [PATCH 3/9] x86: Make old K8 swapgs workaround conditional Andi Kleen
2016-03-21 16:16 ` [PATCH 4/9] x86: Enumerate kernel FSGS capability in AT_HWCAP2 Andi Kleen
2016-03-21 18:49   ` Brian Gerst
2016-03-21 18:54     ` Andi Kleen
2016-03-21 19:32       ` Brian Gerst
2016-03-21 19:43         ` Andi Kleen
2016-03-21 22:10           ` Andy Lutomirski
2016-03-21 16:16 ` [PATCH 5/9] x86: Add documentation for rd/wr fs/gs base Andi Kleen
2016-03-23 19:14   ` Valdis.Kletnieks
2016-03-21 16:16 ` [PATCH 6/9] x86: Use rd/wr fs/gs base in arch_prctl Andi Kleen
2016-03-21 18:17   ` Andy Lutomirski
2016-03-21 16:16 ` [PATCH 7/9] x86: Add self test code for fsgsbase Andi Kleen
2016-03-21 16:16 ` [PATCH 8/9] x86: Support arbitrary fs/gs base in getregs Andi Kleen
2016-03-21 16:16 ` [PATCH 9/9] x86: Save FS/GS base in core dump Andi Kleen
2016-03-21 18:39 ` Updated version of RD/WR FS/GS BASE patchkit Andy Lutomirski
2016-03-21 19:03   ` Andi Kleen
2016-03-21 19:23     ` Andy Lutomirski
2016-03-21 19:40       ` Andi Kleen
2016-03-21 22:05         ` Andy Lutomirski
2016-03-21 22:11           ` Andi Kleen
2016-03-21 22:27             ` Andy Lutomirski
2016-03-21 22:41               ` Andi Kleen
2016-03-21 22:47                 ` Andy Lutomirski
2016-03-21 22:52                   ` Andi Kleen
2016-03-21 22:57                     ` Andy Lutomirski
2016-03-21 23:02                       ` Andi Kleen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1458576969-13309-2-git-send-email-andi@firstfloor.org \
    --to=andi@firstfloor.org \
    --cc=ak@linux.intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@amacapital.net \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH 1/9] x86: Add intrinsics/macros for new rd/wr fs/gs base instructions' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).