xtensa: implement task_user_regset_view

- define struct user_pt_regs in the arch/xtensa/include/uapi/asm/ptrace.h
  with the same layout as xtensa_gregset_t; make xtensa_gregset_t a
  typedef;
- define REGSET_GPR regset, implement register get and set functions;
- define task_user_regset_view function and expose REGSET_GPR.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

arch/xtensa/include/uapi/asm/ptrace.h

@@ -12,6 +12,8 @@
 #ifndef _UAPI_XTENSA_PTRACE_H
 #define _UAPI_XTENSA_PTRACE_H
 
+#include <linux/types.h>
+
 /* Registers used by strace */
 
 #define REG_A_BASE	0x0000
@@ -36,5 +38,21 @@
 #define PTRACE_GETHBPREGS	20
 #define PTRACE_SETHBPREGS	21
 
+#ifndef __ASSEMBLY__
 
+struct user_pt_regs {
+	__u32 pc;
+	__u32 ps;
+	__u32 lbeg;
+	__u32 lend;
+	__u32 lcount;
+	__u32 sar;
+	__u32 windowstart;
+	__u32 windowbase;
+	__u32 threadptr;
+	__u32 reserved[7 + 48];
+	__u32 a[64];
+};
+
+#endif
 #endif /* _UAPI_XTENSA_PTRACE_H */