XXX AVX procfs

*** 70,103 ****
  typedef struct ucontext ucontext_t;
  #else
  typedef struct __ucontext ucontext_t;
  #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
  
  #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  struct  ucontext {
  #else
  struct  __ucontext {
  #endif
          unsigned long   uc_flags;
          ucontext_t      *uc_link;
          sigset_t        uc_sigmask;
          stack_t         uc_stack;
          mcontext_t      uc_mcontext;
!         long            uc_filler[5];   /* see ABI spec for Intel386 */
  };
  
  #if defined(_SYSCALL32)
  
  /* Kernel view of user ILP32 ucontext structure */
  
  typedef struct ucontext32 {
          uint32_t        uc_flags;
          caddr32_t       uc_link;
          sigset_t        uc_sigmask;
          stack32_t       uc_stack;
          mcontext32_t    uc_mcontext;
!         int32_t         uc_filler[5];
  } ucontext32_t;
  
  #if defined(_KERNEL)
  extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
  extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
--- 70,117 ----
  typedef struct ucontext ucontext_t;
  #else
  typedef struct __ucontext ucontext_t;
  #endif /* !defined(_XPG4_2) || defined(__EXTENSIONS__) */
  
+ #define XRS_ID  0x00737278      /* the string "xrs" */
+ 
+ typedef struct {
+         unsigned long   xrs_id;
+         caddr_t         xrs_ptr;
+ } xrs_t;
+ 
  #if !defined(_XPG4_2) || defined(__EXTENSIONS__)
  struct  ucontext {
  #else
  struct  __ucontext {
  #endif
          unsigned long   uc_flags;
          ucontext_t      *uc_link;
          sigset_t        uc_sigmask;
          stack_t         uc_stack;
          mcontext_t      uc_mcontext;
!         xrs_t           uc_xrs;
!         long            uc_filler[3];   /* see ABI spec for Intel386 */
  };
  
  #if defined(_SYSCALL32)
  
+ typedef struct {
+         uint32_t        xrs_id;
+         caddr32_t       xrs_ptr;
+ } xrs32_t;
+ 
  /* Kernel view of user ILP32 ucontext structure */
  
  typedef struct ucontext32 {
          uint32_t        uc_flags;
          caddr32_t       uc_link;
          sigset_t        uc_sigmask;
          stack32_t       uc_stack;
          mcontext32_t    uc_mcontext;
!         xrs32_t         uc_xrs;
!         int32_t         uc_filler[3];
  } ucontext32_t;
  
  #if defined(_KERNEL)
  extern void ucontext_nto32(const ucontext_t *src, ucontext32_t *dest);
  extern void ucontext_32ton(const ucontext32_t *src, ucontext_t *dest);
*** 120,129 ****
--- 134,144 ----
  
  #define UC_SIGMASK      0x01
  #define UC_STACK        0x02
  #define UC_CPU          0x04
  #define UC_MAU          0x08
+ #define UC_XREGS        0x10
  #define UC_FPU          UC_MAU
  
  #define UC_MCONTEXT     (UC_CPU|UC_FPU)
  
  /*