amd64-linux: expose system register FS_BASE and GS_BASE for Linux.

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.

2017-01-27  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-nat.c (amd64_native_gregset_reg_offset): 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.

Change-Id: I2e0eeb93058a2320d4d3b045082643cfe4aff963
Signed-off-by: Walfred Tedeschi <walfred.tedeschi@intel.com>

8 files changed, 16 insertions, 0 deletions

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