Added sys/ucontext.h and sys/user.h to all API levels.

Also
1. Header singal.h now includes <sys/ucontext.h>
2. asm/user.h include sys/user.h
3. change use of user_i387_struct to user_fpregs_struct

See bionic 26a8eb50a84e131d34d10d5d167d67e9995399bd

Change-Id: I9592e98b90d773ef5babb428a6a6ef208fe86327

ndk/platforms/android-3/arch-arm/include/asm/user.h

@@ -9,64 +9,5 @@
  ***
  ****************************************************************************
  ****************************************************************************/
-#ifndef _ARM_USER_H
-#define _ARM_USER_H
 
-#include <asm/page.h>
-#include <asm/ptrace.h>
-
-struct user_fp {
- struct fp_reg {
- unsigned int sign1:1;
- unsigned int unused:15;
- unsigned int sign2:1;
- unsigned int exponent:14;
- unsigned int j:1;
- unsigned int mantissa1:31;
- unsigned int mantissa0:32;
- } fpregs[8];
- unsigned int fpsr:32;
- unsigned int fpcr:32;
- unsigned char ftype[8];
- unsigned int init_flag;
-};
-
-struct user{
-
- struct pt_regs regs;
-
- int u_fpvalid;
-
- unsigned long int u_tsize;
- unsigned long int u_dsize;
- unsigned long int u_ssize;
- unsigned long start_code;
- unsigned long start_stack;
- long int signal;
- int reserved;
- struct pt_regs * u_ar0;
-
- unsigned long magic;
- char u_comm[32];
- int u_debugreg[8];
- struct user_fp u_fp;
- struct user_fp_struct * u_fp0;
-
-};
-#define NBPG PAGE_SIZE
-#define UPAGES 1
-#define HOST_TEXT_START_ADDR (u.start_code)
-#define HOST_STACK_END_ADDR (u.start_stack + u.u_ssize * NBPG)
-
-struct user_vfp {
- unsigned long long fpregs[32];
- unsigned long fpscr;
-};
-
-struct user_vfp_exc {
- unsigned long fpexc;
- unsigned long fpinst;
- unsigned long fpinst2;
-};
-
-#endif
+#include <sys/user.h>