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Re: [PATCH V2 1/1] amd64-linux: expose system register FS_BASE and GS_BASE for Linux.


On 01/05/2017 09:53 AM, Walfred Tedeschi wrote:
This patch allows examination of the registers FS_BASE and GS_BASE
for Linux Systems running on 64bit. Tests for simple read and write
of the new registers is also added with this patch.

Tests were performed on:
x86_64 RHEL 5.3     - For the older ptrace calls.
x86_64 Ubuntu 16.10 - For the new ptrace calls.


Changes from Richard's version:
* Added support for remote.
* Added test cases.


Change requested by John Baldwin, as reported at:

* Moved initialization of fs_base and gs_base from amd64-linux-tdep.c
to amd64-tdep.c

Changes after Pedro's comments:
* Moved usage of "HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE" to native
files.
* Double checked indentation on "gdb/features/Makefile".
* Removed hard coded register number from "64bit-segments.xml"
* Register size was kept as same as orig_rax.
* Removed spurious function from the test sample.
* Test is using prepare_for_testing.

Additional comment on register ordering:
orig_rax is the last register added there is a special macro that defines
it in this way. On gdbserver side it is defined in the middle of
the registers and stays there always for compatibility.

I have added the two new registers just after the orig_rax.  This causes
that they will be in the gdbserver side just after orig_rax and in gdb

I still can add then where I would prefer, the definition is
done by the macros defining AMD64_FSBASE_REGNUM. In this sense they have
been added just before the orig_rax.

This decision was taken based on the fact that we would like to add
hardware registers as usual before the orig_rax, and with this addition
also before the fs_base and gs_base.


2017-01-05  Walfred Tedeschi  <walfred.tedeschi@intel.com>
	    Richard Henderson  <rth@redhat.com>

gdb/ChangeLog:

	* amd64-linux-nat.c (PTRACE_ARCH_PRCTL): New define.
	(amd64_linux_fetch_inferior_registers): Add case to fetch FS_BASE
	GS_BASE for older kernels.
	(amd64_linux_store_inferior_registers): Add case to store FS_BASE
	GS_BASE for older kernels.
	* amd64-linux-tdep.c (amd64_linux_gregset_reg_offset): Add FS_BASE
	and GS_BASE to the offset table.
	(amd64_linux_register_reggroup_p): Add FS_BASE and GS_BASE to the
	system register group.
	* amd64-linux-tdep.h (AMD64_LINUX_ORIG_RAX_REGNUM): Set the value
	to AMD64_NUM_REGS.
	* amd64-nat.c (amd64_native_gregset_reg_offset): Adds valid_regnum
	to test validit of the register.  Implements case for older
	kernels.
	* amd64-tdep.c (amd64_init_abi): Add segment registers for the
	amd64 ABI.
	* amd64-tdep.h (amd64_regnum): Add AMD64_FSBASE_REGNUM and
	AMD64_GSBASE_REGNUM.
	(AMD64_NUM_REGS): Set to AMD64_GSBASE_REGNUM + 1.
	* features/Makefile (amd64-linux.dat, amd64-avx-linux.dat)
	(amd64-mpx-linux.dat, amd64-avx512-linux.dat, x32-linux.dat)
	(x32-avx-linux.dat, x32-avx512-linux.dat): Add
	i386/64bit-segments.xml in those rules.
	* features/i386/64bit-segments.xml: New file.
	* features/i386/amd64-avx-mpx-linux.xml: Add 64bit-segments.xml.
	* features/i386/amd64-avx-linux.xml: Add 64bit-segments.xml.
	* features/i386/amd64-avx512-linux.xml: Add 64bit-segments.xml.
	* features/i386/amd64-mpx-linux.xml: Add 64bit-segments.xml.
	* features/i386/x32-avx512-linux.xml: Add 64bit-segments.xml.
	* features/i386/x32-avx-linux.xml: Add 64bit-segments.xml.
	* features/i386/amd64-linux.xml: Add 64bit-segments.xml.
	* features/i386/amd64-avx-linux.c: Regenerated.
	* features/i386/amd64-avx-mpx-linux.c: Regenerated.
	* features/i386/amd64-avx-mpx.c: Regenerated.
	* features/i386/amd64-avx512-linux.c: Regenerated.
	* features/i386/amd64-linux.c: Regenerated.
	* features/i386/amd64-mpx-linux.c: Regenerated.
	* features/i386/i386-avx-mpx-linux.c: Regenerated.
	* features/i386/i386-avx-mpx.c: Regenerated.
	* features/i386/x32-avx-linux.c: Regenerated.
	* features/i386/x32-avx512-linux.c: Regenerated.
	* regformats/i386/amd64-avx-linux.dat: Regenerated.
	* regformats/i386/amd64-avx-mpx-linux.dat: Regenerated.
	* regformats/i386/amd64-avx512-linux.dat: Regenerated.
	* regformats/i386/amd64-linux.dat: Regenerated.
	* regformats/i386/amd64-mpx-linux.dat: Regenerated.
	* regformats/i386/x32-avx-linux.dat: Regenerated.
	* regformats/i386/x32-avx512-linux.dat: Regenerated.
	* regformats/i386/x32-linux.dat: Regenerated.

gdb/doc/ChangeLog:

	* gdb.texinfo (i386 Features): Add system segment registers
	as feature.

gdb/gdbserver/ChangeLog:

	* linux-x86-low.c (x86_64_regmap): Add fs_base and gs_base
	to the register table.
	(x86_fill_gregset): Add support for old kernels for the
	fs_base and gs_base system registers.
	(x86_store_gregset): Likewise.
	* configure.srv (srv_i386_64bit_xmlfiles): Add 64bit-segments.xml.

gdb/testsuite/ChangeLog:

	* gdb.arch/amd64-gs_base.c: New file.
	* gdb.arch/amd64-gs_base.exp: New file.

---
 gdb/amd64-linux-nat.c                       |  53 ++++++++
 gdb/amd64-linux-tdep.c                      |   7 +-
 gdb/amd64-linux-tdep.h                      |   2 +-
 gdb/amd64-nat.c                             |  19 ++-
 gdb/amd64-tdep.c                            |  13 ++
 gdb/amd64-tdep.h                            |   6 +-
 gdb/doc/gdb.texinfo                         |   3 +
 gdb/features/Makefile                       |  17 +--
 gdb/features/i386/64bit-segments.xml        |  12 ++
 gdb/features/i386/amd64-avx-linux.c         |  36 +++---
 gdb/features/i386/amd64-avx-linux.xml       |   1 +
 gdb/features/i386/amd64-avx-mpx-linux.c     |  48 +++----
 gdb/features/i386/amd64-avx-mpx-linux.xml   |   1 +
 gdb/features/i386/amd64-avx512-linux.c      | 192 ++++++++++++++--------------
 gdb/features/i386/amd64-avx512-linux.xml    |   1 +
 gdb/features/i386/amd64-linux.c             |   4 +
 gdb/features/i386/amd64-linux.xml           |   1 +
 gdb/features/i386/amd64-mpx-linux.c         |  16 ++-
 gdb/features/i386/amd64-mpx-linux.xml       |   1 +
 gdb/features/i386/x32-avx-linux.c           |  36 +++---
 gdb/features/i386/x32-avx-linux.xml         |   1 +
 gdb/features/i386/x32-avx512-linux.c        | 192 ++++++++++++++--------------
 gdb/features/i386/x32-avx512-linux.xml      |   1 +
 gdb/features/i386/x32-linux.c               |   4 +
 gdb/features/i386/x32-linux.xml             |   1 +
 gdb/gdbserver/configure.srv                 |   2 +-
 gdb/gdbserver/linux-x86-low.c               |  32 +++++
 gdb/regformats/i386/amd64-avx-linux.dat     |   2 +
 gdb/regformats/i386/amd64-avx-mpx-linux.dat |   2 +
 gdb/regformats/i386/amd64-avx512-linux.dat  |   2 +
 gdb/regformats/i386/amd64-linux.dat         |   2 +
 gdb/regformats/i386/amd64-mpx-linux.dat     |   2 +
 gdb/regformats/i386/x32-avx-linux.dat       |   2 +
 gdb/regformats/i386/x32-avx512-linux.dat    |   2 +
 gdb/regformats/i386/x32-linux.dat           |   2 +
 gdb/testsuite/gdb.arch/amd64-gs_base.c      |  26 ++++
 gdb/testsuite/gdb.arch/amd64-gs_base.exp    |  51 ++++++++
 37 files changed, 531 insertions(+), 264 deletions(-)
 create mode 100644 gdb/features/i386/64bit-segments.xml
 create mode 100644 gdb/testsuite/gdb.arch/amd64-gs_base.c
 create mode 100644 gdb/testsuite/gdb.arch/amd64-gs_base.exp

diff --git a/gdb/amd64-linux-nat.c b/gdb/amd64-linux-nat.c
index 4a2036b..0ec22cb 100644
--- a/gdb/amd64-linux-nat.c
+++ b/gdb/amd64-linux-nat.c
@@ -40,6 +40,11 @@
 #include "nat/linux-ptrace.h"
 #include "nat/amd64-linux-siginfo.h"

+/* This definition comes from prctl.h, but some kernels may not have it.  */

Would it be worth mentioning the version of the oldest kernel that carries this definition?

+#ifndef PTRACE_ARCH_PRCTL
+#define PTRACE_ARCH_PRCTL      30
+#endif
+
 /* Mapping between the general-purpose registers in GNU/Linux x86-64
    `struct user' format and GDB's register cache layout for GNU/Linux
    i386.
@@ -171,6 +176,30 @@ amd64_linux_fetch_inferior_registers (struct target_ops *ops,

 	  amd64_supply_fxsave (regcache, -1, &fpregs);
 	}
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+      {
+	/* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+	   fs_base and gs_base fields of user_regs_struct can be
+	   used directly.  */
+	unsigned long base;
+
+	if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
+	  {
+	    if (ptrace (PTRACE_ARCH_PRCTL, tid, &base, ARCH_GET_FS) < 0)
+	      perror_with_name (_("Couldn't get segment register fs_base"));
+
+	    regcache_raw_supply (regcache, AMD64_FSBASE_REGNUM, &base);
+	  }
+
+	if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
+	  {
+	    if (ptrace (PTRACE_ARCH_PRCTL, tid, &base, ARCH_GET_GS) < 0)
+	      perror_with_name (_("Couldn't get segment register gs_base"));
+
+	    regcache_raw_supply (regcache, AMD64_GSBASE_REGNUM, &base);
+	  }
+      }
+#endif
     }
 }

@@ -237,6 +266,30 @@ amd64_linux_store_inferior_registers (struct target_ops *ops,
 	  if (ptrace (PTRACE_SETFPREGS, tid, 0, (long) &fpregs) < 0)
 	    perror_with_name (_("Couldn't write floating point status"));
 	}
+
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+      {
+	/* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+	   fs_base and gs_base fields of user_regs_struct can be
+	   used directly.  */
+	void *base;
+
+	if (regnum == -1 || regnum == AMD64_FSBASE_REGNUM)
+	  {
+	    regcache_raw_collect (regcache, AMD64_FSBASE_REGNUM, &base);
+
+	    if (ptrace (PTRACE_ARCH_PRCTL, tid, base, ARCH_SET_FS) < 0)
+	      perror_with_name (_("Couldn't write fs_base"));

Nit, but should we make the messages more coherent?

"Couldn't write segment register fs_base" for example?

+	  }
+	if (regnum == -1 || regnum == AMD64_GSBASE_REGNUM)
+	  {
+
+	    regcache_raw_collect (regcache, AMD64_GSBASE_REGNUM, &base);
+	    if (ptrace (PTRACE_ARCH_PRCTL, tid, base, ARCH_SET_GS) < 0)
+	      perror_with_name (_("Couldn't write gs_base"));
+	  }
+      }
+#endif
     }
 }
 
diff --git a/gdb/amd64-linux-tdep.c b/gdb/amd64-linux-tdep.c
index 1e9f75f..b9d7176 100644
--- a/gdb/amd64-linux-tdep.c
+++ b/gdb/amd64-linux-tdep.c
@@ -103,6 +103,9 @@ int amd64_linux_gregset_reg_offset[] =
   -1, -1, -1, -1, -1, -1, -1, -1,
   -1, -1, -1, -1, -1, -1, -1, -1,
   -1, -1, -1, -1, -1, -1, -1, -1,
+
+  /* End of hardware registers */
+  21 * 8, 22 * 8,		      /* fs_base and gs_base.  */
   15 * 8			      /* "orig_rax" */
 };
 
@@ -284,7 +287,9 @@ static int
 amd64_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
 				 struct reggroup *group)
 {
-  if (regnum == AMD64_LINUX_ORIG_RAX_REGNUM)
+  if (regnum == AMD64_LINUX_ORIG_RAX_REGNUM
+      || regnum == AMD64_FSBASE_REGNUM
+      || regnum == AMD64_GSBASE_REGNUM)
     return (group == system_reggroup
             || group == save_reggroup
             || group == restore_reggroup);
diff --git a/gdb/amd64-linux-tdep.h b/gdb/amd64-linux-tdep.h
index 5d032a6..3704caa 100644
--- a/gdb/amd64-linux-tdep.h
+++ b/gdb/amd64-linux-tdep.h
@@ -26,7 +26,7 @@
 /* Register number for the "orig_rax" register.  If this register
    contains a value >= 0 it is interpreted as the system call number
    that the kernel is supposed to restart.  */
-#define AMD64_LINUX_ORIG_RAX_REGNUM (AMD64_ZMM31H_REGNUM + 1)
+#define AMD64_LINUX_ORIG_RAX_REGNUM (AMD64_NUM_REGS)

 /* Total number of registers for GNU/Linux.  */
 #define AMD64_LINUX_NUM_REGS (AMD64_LINUX_ORIG_RAX_REGNUM + 1)
diff --git a/gdb/amd64-nat.c b/gdb/amd64-nat.c
index 18c8a99..0143632 100644
--- a/gdb/amd64-nat.c
+++ b/gdb/amd64-nat.c
@@ -53,6 +53,7 @@ amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum)
 {
   int *reg_offset = amd64_native_gregset64_reg_offset;
   int num_regs = amd64_native_gregset64_num_regs;
+  bool valid_regnum = false;

   gdb_assert (regnum >= 0);

@@ -65,10 +66,22 @@ amd64_native_gregset_reg_offset (struct gdbarch *gdbarch, int regnum)
   if (num_regs > gdbarch_num_regs (gdbarch))
     num_regs = gdbarch_num_regs (gdbarch);

-  if (regnum < num_regs && regnum < gdbarch_num_regs (gdbarch))
-    return reg_offset[regnum];
+  /* Looks like we do not need the second part of the &&.
+     Register validity is already guaranteed in the first part due to the
+     comparison above.  */

It looks that way. Can we remove that conditional block then and remove the comment?

+  valid_regnum = regnum < num_regs && regnum < gdbarch_num_regs (gdbarch);

-  return -1;
+  if (valid_regnum == false)
+    return -1;
+
+  /* Definition of the offset foresees new kernel support, it has to be
+     corrected here in case the kernel is older.  */
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+  if (regnum == AMD64_FSBASE_REGNUM || regnum == AMD64_GSBASE_REGNUM)
+    return -1;
+#endif
+
+  return reg_offset[regnum];
 }

 /* Return whether the native general-purpose register set supplies
diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index a636742..2588025 100644
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -3047,6 +3047,19 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
       tdep->bnd0r_regnum = AMD64_BND0R_REGNUM;
     }

+  if (tdesc_find_feature (tdesc, "org.gnu.gdb.i386.segments") != NULL)
+    {
+      const struct tdesc_feature *feature =
+	  tdesc_find_feature (tdesc, "org.gnu.gdb.i386.segments");
+      struct tdesc_arch_data *tdesc_data_segments
+      = (struct tdesc_arch_data *) info.tdep_info;
+
+      tdesc_numbered_register (feature, tdesc_data_segments,
+		       AMD64_FSBASE_REGNUM, "fs_base");
+      tdesc_numbered_register (feature, tdesc_data_segments,
+		       AMD64_GSBASE_REGNUM, "gs_base");
+    }
+
   tdep->num_byte_regs = 20;
   tdep->num_word_regs = 16;
   tdep->num_dword_regs = 16;
diff --git a/gdb/amd64-tdep.h b/gdb/amd64-tdep.h
index 3f84947..8ccf031 100644
--- a/gdb/amd64-tdep.h
+++ b/gdb/amd64-tdep.h
@@ -76,13 +76,15 @@ enum amd64_regnum
   AMD64_K0_REGNUM,
   AMD64_K7_REGNUM = AMD64_K0_REGNUM + 7,
   AMD64_ZMM0H_REGNUM,
-  AMD64_ZMM31H_REGNUM = AMD64_ZMM0H_REGNUM + 31
+  AMD64_ZMM31H_REGNUM = AMD64_ZMM0H_REGNUM + 31,
+  AMD64_FSBASE_REGNUM,
+  AMD64_GSBASE_REGNUM
 };

 /* Number of general purpose registers.  */
 #define AMD64_NUM_GREGS		24

-#define AMD64_NUM_REGS		(AMD64_ZMM31H_REGNUM + 1)
+#define AMD64_NUM_REGS		(AMD64_GSBASE_REGNUM + 1)

 extern struct target_desc *tdesc_amd64;

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 2b6b654..4e854ce 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -41148,6 +41148,9 @@ Memory Protection Extension (MPX).  It should describe the following registers:
 The @samp{org.gnu.gdb.i386.linux} feature is optional.  It should
 describe a single register, @samp{orig_eax}.

+The @samp{org.gnu.gdb.i386.segments} feature is optional.  It should
+describe two system registers: @samp{fs_base} and @samp{gs_base}.
+
 The @samp{org.gnu.gdb.i386.avx512} feature is optional and requires the
 @samp{org.gnu.gdb.i386.avx} feature.  It should
 describe additional @sc{xmm} registers:
diff --git a/gdb/features/Makefile b/gdb/features/Makefile
index 63f8248..5a82641 100644
--- a/gdb/features/Makefile
+++ b/gdb/features/Makefile
@@ -259,7 +259,7 @@ $(outdir)/i386/i386-linux.dat: i386/32bit-core.xml i386/32bit-sse.xml \
 			       i386/32bit-linux.xml
 $(outdir)/i386/amd64.dat: i386/64bit-core.xml i386/64bit-sse.xml
 $(outdir)/i386/amd64-linux.dat: i386/64bit-core.xml i386/64bit-sse.xml \
-			        i386/64bit-linux.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml
 $(outdir)/i386/i386-avx.dat: i386/32bit-core.xml i386/32bit-avx.xml
 $(outdir)/i386/i386-avx-linux.dat: i386/32bit-core.xml i386/32bit-avx.xml \
 			       i386/32bit-linux.xml
@@ -279,11 +279,11 @@ $(outdir)/i386/i386-mmx.dat: i386/32bit-core.xml
 $(outdir)/i386/i386-mmx-linux.dat: i386/32bit-core.xml i386/32bit-linux.xml
 $(outdir)/i386/amd64-avx.dat: i386/64bit-core.xml i386/64bit-avx.xml
 $(outdir)/i386/amd64-avx-linux.dat: i386/64bit-core.xml i386/64bit-avx.xml \
-				    i386/64bit-linux.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml
 $(outdir)/i386/amd64-mpx-linux.dat: i386/64bit-core.xml i386/64bit-avx.xml \
-			       i386/64bit-linux.xml i386/64bit-mpx.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml i386/64bit-mpx.xml
 $(outdir)/i386/amd64-avx-mpx-linux.dat: i386/64bit-core.xml \
-			       i386/64bit-linux.xml i386/64bit-mpx.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml i386/64bit-mpx.xml
 $(outdir)/i386/amd64-mpx.dat: i386/64bit-core.xml i386/64bit-avx.xml \
 			       i386/64bit-mpx.xml
 $(outdir)/i386/amd64-avx-mpx.dat: i386/64bit-core.xml \
@@ -292,17 +292,18 @@ $(outdir)/i386/amd64-avx512.dat: i386/64bit-core.xml i386/64bit-avx.xml \
 			       i386/64bit-mpx.xml i386/64bit-avx512.xml
 $(outdir)/i386/amd64-avx512-linux.dat: i386/64bit-core.xml i386/64bit-avx.xml \
 			       i386/64bit-mpx.xml i386/64bit-avx512.xml \
-			       i386/64bit-linux.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml
 $(outdir)/i386/x32.dat: i386/x32-core.xml i386/64bit-sse.xml
 $(outdir)/i386/x32-linux.dat: i386/x32-core.xml i386/64bit-sse.xml \
-			      i386/64bit-linux.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml
 $(outdir)/i386/x32-avx.dat: i386/x32-core.xml i386/64bit-avx.xml
 $(outdir)/i386/x32-avx-linux.dat: i386/x32-core.xml i386/64bit-avx.xml \
-				  i386/64bit-linux.xml
+			       i386/64bit-linux.xml i386/64bit-segments.xml
 $(outdir)/i386/x32-avx512.dat: i386/x32-core.xml i386/64bit-avx.xml \
 			       i386/64bit-mpx.xml i386/64bit-avx512.xml
 $(outdir)/i386/x32-avx512-linux.dat: i386/x32-core.xml i386/64bit-avx.xml \
-			       i386/64bit-mpx.xml i386/64bit-avx512.xml i386/64bit-linux.xml
+			       i386/64bit-mpx.xml i386/64bit-avx512.xml \
+			       i386/64bit-linux.xml i386/64bit-segments.xml

 # 'all' doesn't build the C files, so don't delete them in 'clean'
 # either.
diff --git a/gdb/features/i386/64bit-segments.xml b/gdb/features/i386/64bit-segments.xml
new file mode 100644
index 0000000..16c0929
--- /dev/null
+++ b/gdb/features/i386/64bit-segments.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<!-- Copyright (C) 2016 Free Software Foundation, Inc.

2017

+
+     Copying and distribution of this file, with or without modification,
+     are permitted in any medium without royalty provided the copyright
+     notice and this notice are preserved.  -->
+
+<!DOCTYPE feature SYSTEM "gdb-target.dtd">
+<feature name="org.gnu.gdb.i386.segments">
+  <reg name="fs_base" bitsize="64" type="int"/>
+  <reg name="gs_base" bitsize="64" type="int"/>
+</feature>
diff --git a/gdb/features/i386/amd64-avx-linux.c b/gdb/features/i386/amd64-avx-linux.c
index 9c8f9eb..1d56dbf 100644
--- a/gdb/features/i386/amd64-avx-linux.c
+++ b/gdb/features/i386/amd64-avx-linux.c
@@ -151,23 +151,27 @@ initialize_tdesc_amd64_avx_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
-  tdesc_create_reg (feature, "ymm0h", 58, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm1h", 59, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm2h", 60, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm3h", 61, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm4h", 62, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm5h", 63, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm6h", 64, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm7h", 65, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm8h", 66, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm9h", 67, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm10h", 68, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm11h", 69, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm12h", 70, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm13h", 71, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm14h", 72, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm15h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm0h", 60, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm1h", 61, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm2h", 62, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm3h", 63, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm4h", 64, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm5h", 65, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm6h", 66, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm7h", 67, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm8h", 68, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm9h", 69, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm10h", 70, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm11h", 71, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm12h", 72, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm13h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm14h", 74, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm15h", 75, 1, NULL, 128, "uint128");

   tdesc_amd64_avx_linux = result;
 }
diff --git a/gdb/features/i386/amd64-avx-linux.xml b/gdb/features/i386/amd64-avx-linux.xml
index 470dd55..2dac9cd 100644
--- a/gdb/features/i386/amd64-avx-linux.xml
+++ b/gdb/features/i386/amd64-avx-linux.xml
@@ -14,5 +14,6 @@
   <xi:include href="64bit-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-avx.xml"/>
 </target>
diff --git a/gdb/features/i386/amd64-avx-mpx-linux.c b/gdb/features/i386/amd64-avx-mpx-linux.c
index 4605480..26c1339 100644
--- a/gdb/features/i386/amd64-avx-mpx-linux.c
+++ b/gdb/features/i386/amd64-avx-mpx-linux.c
@@ -151,23 +151,27 @@ initialize_tdesc_amd64_avx_mpx_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
-  tdesc_create_reg (feature, "ymm0h", 58, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm1h", 59, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm2h", 60, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm3h", 61, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm4h", 62, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm5h", 63, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm6h", 64, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm7h", 65, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm8h", 66, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm9h", 67, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm10h", 68, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm11h", 69, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm12h", 70, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm13h", 71, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm14h", 72, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm15h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm0h", 60, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm1h", 61, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm2h", 62, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm3h", 63, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm4h", 64, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm5h", 65, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm6h", 66, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm7h", 67, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm8h", 68, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm9h", 69, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm10h", 70, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm11h", 71, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm12h", 72, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm13h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm14h", 74, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm15h", 75, 1, NULL, 128, "uint128");

   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx");
   type = tdesc_create_struct (feature, "br128");
@@ -200,12 +204,12 @@ initialize_tdesc_amd64_avx_mpx_linux (void)
   field_type = tdesc_named_type (feature, "_bndcfgu");
   tdesc_add_field (type, "config", field_type);

-  tdesc_create_reg (feature, "bnd0raw", 74, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd1raw", 75, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd2raw", 76, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd3raw", 77, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bndcfgu", 78, 1, NULL, 64, "cfgu");
-  tdesc_create_reg (feature, "bndstatus", 79, 1, NULL, 64, "status");
+  tdesc_create_reg (feature, "bnd0raw", 76, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd1raw", 77, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd2raw", 78, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd3raw", 79, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bndcfgu", 80, 1, NULL, 64, "cfgu");
+  tdesc_create_reg (feature, "bndstatus", 81, 1, NULL, 64, "status");

   tdesc_amd64_avx_mpx_linux = result;
 }
diff --git a/gdb/features/i386/amd64-avx-mpx-linux.xml b/gdb/features/i386/amd64-avx-mpx-linux.xml
index e29317f..433f777 100644
--- a/gdb/features/i386/amd64-avx-mpx-linux.xml
+++ b/gdb/features/i386/amd64-avx-mpx-linux.xml
@@ -14,6 +14,7 @@
   <xi:include href="64bit-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-avx.xml"/>
   <xi:include href="64bit-mpx.xml"/>
 </target>
diff --git a/gdb/features/i386/amd64-avx512-linux.c b/gdb/features/i386/amd64-avx512-linux.c
index ec3ba61..b071f62 100644
--- a/gdb/features/i386/amd64-avx512-linux.c
+++ b/gdb/features/i386/amd64-avx512-linux.c
@@ -151,23 +151,27 @@ initialize_tdesc_amd64_avx512_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
-  tdesc_create_reg (feature, "ymm0h", 58, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm1h", 59, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm2h", 60, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm3h", 61, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm4h", 62, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm5h", 63, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm6h", 64, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm7h", 65, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm8h", 66, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm9h", 67, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm10h", 68, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm11h", 69, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm12h", 70, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm13h", 71, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm14h", 72, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm15h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm0h", 60, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm1h", 61, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm2h", 62, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm3h", 63, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm4h", 64, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm5h", 65, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm6h", 66, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm7h", 67, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm8h", 68, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm9h", 69, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm10h", 70, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm11h", 71, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm12h", 72, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm13h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm14h", 74, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm15h", 75, 1, NULL, 128, "uint128");

   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx");
   type = tdesc_create_struct (feature, "br128");
@@ -200,12 +204,12 @@ initialize_tdesc_amd64_avx512_linux (void)
   field_type = tdesc_named_type (feature, "_bndcfgu");
   tdesc_add_field (type, "config", field_type);

-  tdesc_create_reg (feature, "bnd0raw", 74, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd1raw", 75, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd2raw", 76, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd3raw", 77, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bndcfgu", 78, 1, NULL, 64, "cfgu");
-  tdesc_create_reg (feature, "bndstatus", 79, 1, NULL, 64, "status");
+  tdesc_create_reg (feature, "bnd0raw", 76, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd1raw", 77, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd2raw", 78, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd3raw", 79, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bndcfgu", 80, 1, NULL, 64, "cfgu");
+  tdesc_create_reg (feature, "bndstatus", 81, 1, NULL, 64, "status");

   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx512");
   field_type = tdesc_named_type (feature, "ieee_single");
@@ -245,78 +249,78 @@ initialize_tdesc_amd64_avx512_linux (void)
   field_type = tdesc_named_type (feature, "uint128");
   tdesc_create_vector (feature, "v2ui128", field_type, 2);

-  tdesc_create_reg (feature, "xmm16", 80, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm17", 81, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm18", 82, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm19", 83, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm20", 84, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm21", 85, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm22", 86, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm23", 87, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm24", 88, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm25", 89, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm26", 90, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm27", 91, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm28", 92, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm29", 93, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm30", 94, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm31", 95, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "ymm16h", 96, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm17h", 97, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm18h", 98, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm19h", 99, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm20h", 100, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm21h", 101, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm22h", 102, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm23h", 103, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm24h", 104, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm25h", 105, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm26h", 106, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm27h", 107, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm28h", 108, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm29h", 109, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm30h", 110, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm31h", 111, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "k0", 112, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k1", 113, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k2", 114, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k3", 115, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k4", 116, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k5", 117, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k6", 118, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k7", 119, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "zmm0h", 120, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm1h", 121, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm2h", 122, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm3h", 123, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm4h", 124, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm5h", 125, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm6h", 126, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm7h", 127, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm8h", 128, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm9h", 129, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm10h", 130, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm11h", 131, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm12h", 132, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm13h", 133, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm14h", 134, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm15h", 135, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm16h", 136, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm17h", 137, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm18h", 138, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm19h", 139, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm20h", 140, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm21h", 141, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm22h", 142, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm23h", 143, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm24h", 144, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm25h", 145, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm26h", 146, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm27h", 147, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm28h", 148, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm29h", 149, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm30h", 150, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm31h", 151, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "xmm16", 82, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm17", 83, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm18", 84, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm19", 85, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm20", 86, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm21", 87, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm22", 88, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm23", 89, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm24", 90, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm25", 91, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm26", 92, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm27", 93, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm28", 94, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm29", 95, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm30", 96, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm31", 97, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "ymm16h", 98, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm17h", 99, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm18h", 100, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm19h", 101, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm20h", 102, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm21h", 103, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm22h", 104, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm23h", 105, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm24h", 106, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm25h", 107, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm26h", 108, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm27h", 109, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm28h", 110, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm29h", 111, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm30h", 112, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm31h", 113, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "k0", 114, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k1", 115, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k2", 116, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k3", 117, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k4", 118, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k5", 119, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k6", 120, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k7", 121, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "zmm0h", 122, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm1h", 123, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm2h", 124, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm3h", 125, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm4h", 126, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm5h", 127, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm6h", 128, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm7h", 129, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm8h", 130, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm9h", 131, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm10h", 132, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm11h", 133, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm12h", 134, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm13h", 135, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm14h", 136, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm15h", 137, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm16h", 138, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm17h", 139, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm18h", 140, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm19h", 141, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm20h", 142, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm21h", 143, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm22h", 144, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm23h", 145, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm24h", 146, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm25h", 147, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm26h", 148, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm27h", 149, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm28h", 150, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm29h", 151, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm30h", 152, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm31h", 153, 1, NULL, 256, "v2ui128");

   tdesc_amd64_avx512_linux = result;
 }
diff --git a/gdb/features/i386/amd64-avx512-linux.xml b/gdb/features/i386/amd64-avx512-linux.xml
index 2ee2e8b..516f4e3 100644
--- a/gdb/features/i386/amd64-avx512-linux.xml
+++ b/gdb/features/i386/amd64-avx512-linux.xml
@@ -14,6 +14,7 @@
   <xi:include href="64bit-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-avx.xml"/>
   <xi:include href="64bit-mpx.xml"/>
   <xi:include href="64bit-avx512.xml"/>
diff --git a/gdb/features/i386/amd64-linux.c b/gdb/features/i386/amd64-linux.c
index 02aeba5..0e921ba9 100644
--- a/gdb/features/i386/amd64-linux.c
+++ b/gdb/features/i386/amd64-linux.c
@@ -151,5 +151,9 @@ initialize_tdesc_amd64_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   tdesc_amd64_linux = result;
 }
diff --git a/gdb/features/i386/amd64-linux.xml b/gdb/features/i386/amd64-linux.xml
index 2ce9341..7d3a9f2 100644
--- a/gdb/features/i386/amd64-linux.xml
+++ b/gdb/features/i386/amd64-linux.xml
@@ -14,4 +14,5 @@
   <xi:include href="64bit-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
 </target>
diff --git a/gdb/features/i386/amd64-mpx-linux.c b/gdb/features/i386/amd64-mpx-linux.c
index a20ca4f..e26a74a 100644
--- a/gdb/features/i386/amd64-mpx-linux.c
+++ b/gdb/features/i386/amd64-mpx-linux.c
@@ -151,6 +151,10 @@ initialize_tdesc_amd64_mpx_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx");
   type = tdesc_create_struct (feature, "br128");
   field_type = tdesc_named_type (feature, "uint64");
@@ -182,12 +186,12 @@ initialize_tdesc_amd64_mpx_linux (void)
   field_type = tdesc_named_type (feature, "_bndcfgu");
   tdesc_add_field (type, "config", field_type);

-  tdesc_create_reg (feature, "bnd0raw", 58, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd1raw", 59, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd2raw", 60, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd3raw", 61, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bndcfgu", 62, 1, NULL, 64, "cfgu");
-  tdesc_create_reg (feature, "bndstatus", 63, 1, NULL, 64, "status");
+  tdesc_create_reg (feature, "bnd0raw", 60, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd1raw", 61, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd2raw", 62, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd3raw", 63, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bndcfgu", 64, 1, NULL, 64, "cfgu");
+  tdesc_create_reg (feature, "bndstatus", 65, 1, NULL, 64, "status");

   tdesc_amd64_mpx_linux = result;
 }
diff --git a/gdb/features/i386/amd64-mpx-linux.xml b/gdb/features/i386/amd64-mpx-linux.xml
index 9c7cf9a..853b819 100644
--- a/gdb/features/i386/amd64-mpx-linux.xml
+++ b/gdb/features/i386/amd64-mpx-linux.xml
@@ -14,5 +14,6 @@
   <xi:include href="64bit-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-mpx.xml"/>
 </target>
diff --git a/gdb/features/i386/x32-avx-linux.c b/gdb/features/i386/x32-avx-linux.c
index b12c71c..8406815 100644
--- a/gdb/features/i386/x32-avx-linux.c
+++ b/gdb/features/i386/x32-avx-linux.c
@@ -151,23 +151,27 @@ initialize_tdesc_x32_avx_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
-  tdesc_create_reg (feature, "ymm0h", 58, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm1h", 59, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm2h", 60, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm3h", 61, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm4h", 62, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm5h", 63, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm6h", 64, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm7h", 65, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm8h", 66, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm9h", 67, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm10h", 68, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm11h", 69, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm12h", 70, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm13h", 71, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm14h", 72, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm15h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm0h", 60, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm1h", 61, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm2h", 62, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm3h", 63, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm4h", 64, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm5h", 65, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm6h", 66, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm7h", 67, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm8h", 68, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm9h", 69, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm10h", 70, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm11h", 71, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm12h", 72, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm13h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm14h", 74, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm15h", 75, 1, NULL, 128, "uint128");

   tdesc_x32_avx_linux = result;
 }
diff --git a/gdb/features/i386/x32-avx-linux.xml b/gdb/features/i386/x32-avx-linux.xml
index f60a443..89d2e7c 100644
--- a/gdb/features/i386/x32-avx-linux.xml
+++ b/gdb/features/i386/x32-avx-linux.xml
@@ -14,5 +14,6 @@
   <xi:include href="x32-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-avx.xml"/>
 </target>
diff --git a/gdb/features/i386/x32-avx512-linux.c b/gdb/features/i386/x32-avx512-linux.c
index 7b2ab90..3994996 100644
--- a/gdb/features/i386/x32-avx512-linux.c
+++ b/gdb/features/i386/x32-avx512-linux.c
@@ -151,23 +151,27 @@ initialize_tdesc_x32_avx512_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx");
-  tdesc_create_reg (feature, "ymm0h", 58, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm1h", 59, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm2h", 60, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm3h", 61, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm4h", 62, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm5h", 63, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm6h", 64, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm7h", 65, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm8h", 66, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm9h", 67, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm10h", 68, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm11h", 69, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm12h", 70, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm13h", 71, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm14h", 72, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm15h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm0h", 60, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm1h", 61, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm2h", 62, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm3h", 63, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm4h", 64, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm5h", 65, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm6h", 66, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm7h", 67, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm8h", 68, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm9h", 69, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm10h", 70, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm11h", 71, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm12h", 72, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm13h", 73, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm14h", 74, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm15h", 75, 1, NULL, 128, "uint128");

   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.mpx");
   type = tdesc_create_struct (feature, "br128");
@@ -200,12 +204,12 @@ initialize_tdesc_x32_avx512_linux (void)
   field_type = tdesc_named_type (feature, "_bndcfgu");
   tdesc_add_field (type, "config", field_type);

-  tdesc_create_reg (feature, "bnd0raw", 74, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd1raw", 75, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd2raw", 76, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bnd3raw", 77, 1, NULL, 128, "br128");
-  tdesc_create_reg (feature, "bndcfgu", 78, 1, NULL, 64, "cfgu");
-  tdesc_create_reg (feature, "bndstatus", 79, 1, NULL, 64, "status");
+  tdesc_create_reg (feature, "bnd0raw", 76, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd1raw", 77, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd2raw", 78, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bnd3raw", 79, 1, NULL, 128, "br128");
+  tdesc_create_reg (feature, "bndcfgu", 80, 1, NULL, 64, "cfgu");
+  tdesc_create_reg (feature, "bndstatus", 81, 1, NULL, 64, "status");

   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.avx512");
   field_type = tdesc_named_type (feature, "ieee_single");
@@ -245,78 +249,78 @@ initialize_tdesc_x32_avx512_linux (void)
   field_type = tdesc_named_type (feature, "uint128");
   tdesc_create_vector (feature, "v2ui128", field_type, 2);

-  tdesc_create_reg (feature, "xmm16", 80, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm17", 81, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm18", 82, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm19", 83, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm20", 84, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm21", 85, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm22", 86, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm23", 87, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm24", 88, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm25", 89, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm26", 90, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm27", 91, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm28", 92, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm29", 93, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm30", 94, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "xmm31", 95, 1, NULL, 128, "vec128");
-  tdesc_create_reg (feature, "ymm16h", 96, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm17h", 97, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm18h", 98, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm19h", 99, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm20h", 100, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm21h", 101, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm22h", 102, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm23h", 103, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm24h", 104, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm25h", 105, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm26h", 106, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm27h", 107, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm28h", 108, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm29h", 109, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm30h", 110, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "ymm31h", 111, 1, NULL, 128, "uint128");
-  tdesc_create_reg (feature, "k0", 112, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k1", 113, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k2", 114, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k3", 115, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k4", 116, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k5", 117, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k6", 118, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "k7", 119, 1, NULL, 64, "uint64");
-  tdesc_create_reg (feature, "zmm0h", 120, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm1h", 121, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm2h", 122, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm3h", 123, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm4h", 124, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm5h", 125, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm6h", 126, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm7h", 127, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm8h", 128, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm9h", 129, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm10h", 130, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm11h", 131, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm12h", 132, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm13h", 133, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm14h", 134, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm15h", 135, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm16h", 136, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm17h", 137, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm18h", 138, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm19h", 139, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm20h", 140, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm21h", 141, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm22h", 142, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm23h", 143, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm24h", 144, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm25h", 145, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm26h", 146, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm27h", 147, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm28h", 148, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm29h", 149, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm30h", 150, 1, NULL, 256, "v2ui128");
-  tdesc_create_reg (feature, "zmm31h", 151, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "xmm16", 82, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm17", 83, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm18", 84, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm19", 85, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm20", 86, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm21", 87, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm22", 88, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm23", 89, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm24", 90, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm25", 91, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm26", 92, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm27", 93, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm28", 94, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm29", 95, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm30", 96, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "xmm31", 97, 1, NULL, 128, "vec128");
+  tdesc_create_reg (feature, "ymm16h", 98, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm17h", 99, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm18h", 100, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm19h", 101, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm20h", 102, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm21h", 103, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm22h", 104, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm23h", 105, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm24h", 106, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm25h", 107, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm26h", 108, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm27h", 109, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm28h", 110, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm29h", 111, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm30h", 112, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "ymm31h", 113, 1, NULL, 128, "uint128");
+  tdesc_create_reg (feature, "k0", 114, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k1", 115, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k2", 116, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k3", 117, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k4", 118, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k5", 119, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k6", 120, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "k7", 121, 1, NULL, 64, "uint64");
+  tdesc_create_reg (feature, "zmm0h", 122, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm1h", 123, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm2h", 124, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm3h", 125, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm4h", 126, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm5h", 127, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm6h", 128, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm7h", 129, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm8h", 130, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm9h", 131, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm10h", 132, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm11h", 133, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm12h", 134, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm13h", 135, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm14h", 136, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm15h", 137, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm16h", 138, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm17h", 139, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm18h", 140, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm19h", 141, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm20h", 142, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm21h", 143, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm22h", 144, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm23h", 145, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm24h", 146, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm25h", 147, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm26h", 148, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm27h", 149, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm28h", 150, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm29h", 151, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm30h", 152, 1, NULL, 256, "v2ui128");
+  tdesc_create_reg (feature, "zmm31h", 153, 1, NULL, 256, "v2ui128");

   tdesc_x32_avx512_linux = result;
 }
diff --git a/gdb/features/i386/x32-avx512-linux.xml b/gdb/features/i386/x32-avx512-linux.xml
index 73238dc..7266c8e 100644
--- a/gdb/features/i386/x32-avx512-linux.xml
+++ b/gdb/features/i386/x32-avx512-linux.xml
@@ -14,6 +14,7 @@
   <xi:include href="x32-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
   <xi:include href="64bit-avx.xml"/>
   <xi:include href="64bit-mpx.xml"/>
   <xi:include href="64bit-avx512.xml"/>
diff --git a/gdb/features/i386/x32-linux.c b/gdb/features/i386/x32-linux.c
index 1262688..ae49549 100644
--- a/gdb/features/i386/x32-linux.c
+++ b/gdb/features/i386/x32-linux.c
@@ -151,5 +151,9 @@ initialize_tdesc_x32_linux (void)
   feature = tdesc_create_feature (result, "org.gnu.gdb.i386.linux");
   tdesc_create_reg (feature, "orig_rax", 57, 1, NULL, 64, "int");

+  feature = tdesc_create_feature (result, "org.gnu.gdb.i386.segments");
+  tdesc_create_reg (feature, "fs_base", 58, 1, NULL, 64, "int");
+  tdesc_create_reg (feature, "gs_base", 59, 1, NULL, 64, "int");
+
   tdesc_x32_linux = result;
 }
diff --git a/gdb/features/i386/x32-linux.xml b/gdb/features/i386/x32-linux.xml
index a7d0899..023a48d 100644
--- a/gdb/features/i386/x32-linux.xml
+++ b/gdb/features/i386/x32-linux.xml
@@ -14,4 +14,5 @@
   <xi:include href="x32-core.xml"/>
   <xi:include href="64bit-sse.xml"/>
   <xi:include href="64bit-linux.xml"/>
+  <xi:include href="64bit-segments.xml"/>
 </target>
diff --git a/gdb/gdbserver/configure.srv b/gdb/gdbserver/configure.srv
index 3267599..d03dcb9 100644
--- a/gdb/gdbserver/configure.srv
+++ b/gdb/gdbserver/configure.srv
@@ -35,7 +35,7 @@ ipa_x32_linux_regobj="x32-linux-ipa.o x32-avx-linux-ipa.o x32-avx512-linux-ipa.o
 ipa_ppc_linux_regobj="powerpc-32l-ipa.o powerpc-altivec32l-ipa.o powerpc-cell32l-ipa.o powerpc-vsx32l-ipa.o powerpc-isa205-32l-ipa.o powerpc-isa205-altivec32l-ipa.o powerpc-isa205-vsx32l-ipa.o powerpc-e500l-ipa.o powerpc-64l-ipa.o powerpc-altivec64l-ipa.o powerpc-cell64l-ipa.o powerpc-vsx64l-ipa.o powerpc-isa205-64l-ipa.o powerpc-isa205-altivec64l-ipa.o powerpc-isa205-vsx64l-ipa.o"

 srv_i386_32bit_xmlfiles="i386/32bit-core.xml i386/32bit-sse.xml i386/32bit-avx.xml i386/32bit-avx512.xml i386/32bit-mpx.xml"
-srv_i386_64bit_xmlfiles="i386/64bit-core.xml i386/64bit-sse.xml i386/64bit-avx.xml i386/64bit-avx512.xml i386/x32-core.xml i386/64bit-mpx.xml"
+srv_i386_64bit_xmlfiles="i386/64bit-core.xml i386/64bit-segments.xml i386/64bit-sse.xml i386/64bit-avx.xml i386/64bit-avx512.xml i386/x32-core.xml i386/64bit-mpx.xml"
 srv_i386_xmlfiles="i386/i386.xml i386/i386-avx.xml i386/i386-avx512.xml i386/i386-mpx.xml i386/i386-avx-mpx.xml i386/i386-mmx.xml $srv_i386_32bit_xmlfiles"
 srv_amd64_xmlfiles="i386/amd64.xml i386/amd64-avx.xml i386/amd64-avx512.xml i386/x32.xml i386/x32-avx.xml i386/x32-avx512.xml i386/amd64-mpx.xml i386/amd64-avx-mpx.xml  $srv_i386_64bit_xmlfiles"
 srv_i386_linux_xmlfiles="i386/i386-linux.xml i386/i386-avx-linux.xml i386/i386-avx512-linux.xml i386/i386-mmx-linux.xml i386/32bit-linux.xml i386/i386-mpx-linux.xml i386/i386-avx-mpx-linux.xml $srv_i386_32bit_xmlfiles"
diff --git a/gdb/gdbserver/linux-x86-low.c b/gdb/gdbserver/linux-x86-low.c
index dd9538a..8fdf324 100644
--- a/gdb/gdbserver/linux-x86-low.c
+++ b/gdb/gdbserver/linux-x86-low.c
@@ -133,6 +133,11 @@ static const int x86_64_regmap[] =
   -1,
   -1, -1, -1, -1, -1, -1, -1, -1,
   ORIG_RAX * 8,
+#ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+  21 * 8,  22 * 8,
+#else
+  -1, -1,
+#endif
   -1, -1, -1, -1,			/* MPX registers BND0 ... BND3.  */
   -1, -1,				/* MPX registers BNDCFGU, BNDSTATUS.  */
   -1, -1, -1, -1, -1, -1, -1, -1,       /* xmm16 ... xmm31 (AVX512)  */
@@ -306,6 +311,20 @@ x86_fill_gregset (struct regcache *regcache, void *buf)
       for (i = 0; i < X86_64_NUM_REGS; i++)
 	if (x86_64_regmap[i] != -1)
 	  collect_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
+
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+      {
+        unsigned long base;
+        int lwpid = lwpid_of (current_thread);
+
+        collect_register_by_name (regcache, "fs_base", &base);
+        ptrace (PTRACE_ARCH_PRCTL, lwpid, &base, ARCH_SET_FS);
+
+        collect_register_by_name (regcache, "gs_base", &base);
+        ptrace (PTRACE_ARCH_PRCTL, lwpid, &base, ARCH_SET_GS);
+      }
+#endif
+
       return;
     }

@@ -332,6 +351,19 @@ x86_store_gregset (struct regcache *regcache, const void *buf)
       for (i = 0; i < X86_64_NUM_REGS; i++)
 	if (x86_64_regmap[i] != -1)
 	  supply_register (regcache, i, ((char *) buf) + x86_64_regmap[i]);
+
+#ifndef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+      {
+        unsigned long base;
+        int lwpid = lwpid_of (current_thread);
+
+        if (ptrace (PTRACE_ARCH_PRCTL, lwpid, &base, ARCH_GET_FS) == 0)
+          supply_register_by_name (regcache, "fs_base", &base);
+
+        if (ptrace (PTRACE_ARCH_PRCTL, lwpid, &base, ARCH_GET_GS) == 0)
+          supply_register_by_name (regcache, "gs_base", &base);
+      }
+#endif
       return;
     }
 #endif
diff --git a/gdb/regformats/i386/amd64-avx-linux.dat b/gdb/regformats/i386/amd64-avx-linux.dat
index d8199da..7780b3b 100644
--- a/gdb/regformats/i386/amd64-avx-linux.dat
+++ b/gdb/regformats/i386/amd64-avx-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:ymm0h
 128:ymm1h
 128:ymm2h
diff --git a/gdb/regformats/i386/amd64-avx-mpx-linux.dat b/gdb/regformats/i386/amd64-avx-mpx-linux.dat
index 6d45324..7c2f928 100644
--- a/gdb/regformats/i386/amd64-avx-mpx-linux.dat
+++ b/gdb/regformats/i386/amd64-avx-mpx-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:ymm0h
 128:ymm1h
 128:ymm2h
diff --git a/gdb/regformats/i386/amd64-avx512-linux.dat b/gdb/regformats/i386/amd64-avx512-linux.dat
index dfc41e2..f1658d3 100644
--- a/gdb/regformats/i386/amd64-avx512-linux.dat
+++ b/gdb/regformats/i386/amd64-avx512-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:ymm0h
 128:ymm1h
 128:ymm2h
diff --git a/gdb/regformats/i386/amd64-linux.dat b/gdb/regformats/i386/amd64-linux.dat
index 6914cc4..cd16a15 100644
--- a/gdb/regformats/i386/amd64-linux.dat
+++ b/gdb/regformats/i386/amd64-linux.dat
@@ -61,3 +61,5 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
diff --git a/gdb/regformats/i386/amd64-mpx-linux.dat b/gdb/regformats/i386/amd64-mpx-linux.dat
index 523ae01..10487f6 100644
--- a/gdb/regformats/i386/amd64-mpx-linux.dat
+++ b/gdb/regformats/i386/amd64-mpx-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:bnd0raw
 128:bnd1raw
 128:bnd2raw
diff --git a/gdb/regformats/i386/x32-avx-linux.dat b/gdb/regformats/i386/x32-avx-linux.dat
index a2b8d02..eb0e3953 100644
--- a/gdb/regformats/i386/x32-avx-linux.dat
+++ b/gdb/regformats/i386/x32-avx-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:ymm0h
 128:ymm1h
 128:ymm2h
diff --git a/gdb/regformats/i386/x32-avx512-linux.dat b/gdb/regformats/i386/x32-avx512-linux.dat
index 0f5b2ce..0b7f73a 100644
--- a/gdb/regformats/i386/x32-avx512-linux.dat
+++ b/gdb/regformats/i386/x32-avx512-linux.dat
@@ -61,6 +61,8 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
 128:ymm0h
 128:ymm1h
 128:ymm2h
diff --git a/gdb/regformats/i386/x32-linux.dat b/gdb/regformats/i386/x32-linux.dat
index d976a25..eee378f 100644
--- a/gdb/regformats/i386/x32-linux.dat
+++ b/gdb/regformats/i386/x32-linux.dat
@@ -61,3 +61,5 @@ expedite:rbp,rsp,rip
 128:xmm15
 32:mxcsr
 64:orig_rax
+64:fs_base
+64:gs_base
diff --git a/gdb/testsuite/gdb.arch/amd64-gs_base.c b/gdb/testsuite/gdb.arch/amd64-gs_base.c
new file mode 100644
index 0000000..d0a2a8f
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-gs_base.c
@@ -0,0 +1,26 @@
+/* Test program for fs_base and gs_base.
+
+   Copyright 2016 Free Software Foundation, Inc.
+

2017

+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+int
+main (void)
+{
+  volatile int a;
+  a = 10;
+  return a;
+}
diff --git a/gdb/testsuite/gdb.arch/amd64-gs_base.exp b/gdb/testsuite/gdb.arch/amd64-gs_base.exp
new file mode 100644
index 0000000..f2dc887
--- /dev/null
+++ b/gdb/testsuite/gdb.arch/amd64-gs_base.exp
@@ -0,0 +1,51 @@
+# Copyright 2016 Free Software Foundation, Inc.
+

2017

+# Contributed by Intel Corp. <walfred.tedeschi@intel.com>
+

As discussed recently, these contribution notices should be moved to the manual if one wishes to expose it.

+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+standard_testfile
+
+if { ![istarget "x86_64-*linux*"] } then {
+    verbose "Skipping x86_64 fs_base and gs_base tests."

I think untested would be better here.

+    return
+}
+
+if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} \

"failed to prepare" as opposed to ${testfile}.exp

+     [list debug nowarnings]] } {
+    return -1
+}
+
+if ![runto_main] {
+    untested "could not run to main"
+    return -1
+}
+
+gdb_test "print /x \$fs_base" "= $hex" "print fs_base"
+gdb_test "print /x \$gs_base" "= $hex" "print gs_base"
+
+gdb_test "print \$fs_base = 2" "= 2" "set fs_base"
+gdb_test "print \$gs_base = 3" "= 3" "set gs_base"
+
+# Test the presence of fs_base and gs_base on the system
+# register group and values.
+#
+set ws "\[\t \]*"
+set info_reg_out [multi_line "info register sys" \
+          "fs_base${ws}0x2${ws}2"\
+          "gs_base${ws}0x3${ws}3"\
+          "orig_rax${ws}$hex${ws}\[-\]$decimal" ]
+
+gdb_test "info register sys" $info_reg_out\
+   "info registers fs_base and gs_base with value"


Otherwise i have no further comments.


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