x86: move PV privileged instruction emulation code

Move the code to pv/emul-priv-op.c. Prefix emulate_privileged_op with
pv_ and export it via pv/traps.h.

Also move gpr_switch.S since it is used by the privileged instruction
emulation code only.

Code motion only except for the rename. Cleanup etc will come later.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/x86/pv/Makefile

@@ -4,3 +4,5 @@ obj-y += traps.o
 obj-bin-y += dom0_build.init.o
 obj-y += domain.o
 obj-y += emulate.o
+obj-y += emul-priv-op.o
+obj-bin-y += gpr_switch.o

xen/arch/x86/x86_64/Makefile

@@ -1,7 +1,6 @@
 subdir-y += compat
 
 obj-bin-y += entry.o
-obj-bin-y += gpr_switch.o
 obj-y += traps.o
 obj-$(CONFIG_KEXEC) += machine_kexec.o
 obj-y += pci.o

xen/include/asm-x86/pv/traps.h

@@ -0,0 +1,46 @@
+/*
+ * pv/traps.h
+ *
+ * PV guest traps interface definitions
+ *
+ * Copyright (C) 2017 Wei Liu <wei.liu2@citrix.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms and conditions of the GNU General Public
+ * License, version 2, as published by the Free Software Foundation.
+ *
+ * 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/>.
+ */
+
+#ifndef __X86_PV_TRAPS_H__
+#define __X86_PV_TRAPS_H__
+
+#ifdef CONFIG_PV
+
+#include <public/xen.h>
+
+int pv_emulate_privileged_op(struct cpu_user_regs *regs);
+
+#else  /* !CONFIG_PV */
+
+static inline int pv_emulate_privileged_op(struct cpu_user_regs *regs) { return 0; }
+
+#endif /* CONFIG_PV */
+
+#endif /* __X86_PV_TRAPS_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */