Update copyright dates with scripts/update-copyrights.

[thirdparty/glibc.git] / sysdeps / mach / hurd / i386 / tls.h

diff --git a/sysdeps/mach/hurd/i386/tls.h b/sysdeps/mach/hurd/i386/tls.h
index 46e09824122ecdbe08393d32411f371de8e3b336..3ec5bb032be7fbbb33a622528a1de9e80e0bebdd 100644 (file)
--- a/sysdeps/mach/hurd/i386/tls.h
+++ b/sysdeps/mach/hurd/i386/tls.h
@@ -1,5 +1,5 @@
 /* Definitions for thread-local data handling.  Hurd/i386 version.
-   Copyright (C) 2003, 2004, 2006, 2007, 2011 Free Software Foundation, Inc.
+   Copyright (C) 2003-2016 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -13,9 +13,8 @@
    Lesser General Public License for more details.
 
    You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
 #ifndef _I386_TLS_H
 #define _I386_TLS_H
@@ -24,9 +23,44 @@
 /* Some things really need not be machine-dependent.  */
 #include <sysdeps/mach/hurd/tls.h>
 
+
+#ifndef __ASSEMBLER__
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  struct
+  {
+    void *val;
+    bool is_static;
+  } pointer;
+} dtv_t;
+
+
+/* Type of the TCB.  */
+typedef struct
+{
+  void *tcb;                   /* Points to this structure.  */
+  dtv_t *dtv;                  /* Vector of pointers to TLS data.  */
+  thread_t self;               /* This thread's control port.  */
+  int multiple_threads;
+  uintptr_t sysinfo;
+  uintptr_t stack_guard;
+  uintptr_t pointer_guard;
+  int gscope_flag;
+  int private_futex;
+  /* Reservation of some values for the TM ABI.  */
+  void *__private_tm[4];
+  /* GCC split stack support.  */
+  void *__private_ss;
+} tcbhead_t;
+#endif
+
+
 /* The TCB can have any size and the memory following the address the
    thread pointer points to is unspecified.  Allocate the TCB there.  */
 #define TLS_TCB_AT_TP  1
+#define TLS_DTV_AT_TP  0
 
 #ifndef __ASSEMBLER__
 
@@ -56,70 +90,46 @@
 
 
 static inline const char * __attribute__ ((unused))
-_hurd_tls_init (tcbhead_t *tcb, int secondcall)
+_hurd_tls_init (tcbhead_t *tcb)
 {
   HURD_TLS_DESC_DECL (desc, tcb);
 
-  if (!secondcall)
+  /* This field is used by TLS accesses to get our "thread pointer"
+     from the TLS point of view.  */
+  tcb->tcb = tcb;
+
+  /* Cache our thread port.  */
+  tcb->self = __mach_thread_self ();
+
+  /* Get the first available selector.  */
+  int sel = -1;
+  error_t err = __i386_set_gdt (tcb->self, &sel, desc);
+  if (err == MIG_BAD_ID)
     {
-      /* This field is used by TLS accesses to get our "thread pointer"
-        from the TLS point of view.  */
-      tcb->tcb = tcb;
-
-      /* Cache our thread port.  */
-      tcb->self = __mach_thread_self ();
-
-      /* Get the first available selector.  */
-      int sel = -1;
-      error_t err = __i386_set_gdt (tcb->self, &sel, desc);
-      if (err == MIG_BAD_ID)
-       {
-         /* Old kernel, use a per-thread LDT.  */
-         sel = 0x27;
-         err = __i386_set_ldt (tcb->self, sel, &desc, 1);
-         assert_perror (err);
-         if (err)
-           return "i386_set_ldt failed";
-       }
-      else if (err)
-       {
-         assert_perror (err); /* Separate from above with different line #. */
-         return "i386_set_gdt failed";
-       }
-
-      /* Now install the new selector.  */
-      asm volatile ("mov %w0, %%gs" :: "q" (sel));
+      /* Old kernel, use a per-thread LDT.  */
+      sel = 0x27;
+      err = __i386_set_ldt (tcb->self, sel, &desc, 1);
+      assert_perror (err);
+      if (err)
+       return "i386_set_ldt failed";
     }
-  else
+  else if (err)
     {
-      /* Fetch the selector set by the first call.  */
-      int sel;
-      asm ("mov %%gs, %w0" : "=q" (sel) : "0" (0));
-      if (__builtin_expect (sel, 0x50) & 4) /* LDT selector */
-       {
-         error_t err = __i386_set_ldt (tcb->self, sel, &desc, 1);
-         assert_perror (err);
-         if (err)
-           return "i386_set_ldt failed";
-       }
-      else
-       {
-         error_t err = __i386_set_gdt (tcb->self, &sel, desc);
-         assert_perror (err);
-         if (err)
-           return "i386_set_gdt failed";
-       }
+      assert_perror (err); /* Separate from above with different line #. */
+      return "i386_set_gdt failed";
     }
 
+  /* Now install the new selector.  */
+  asm volatile ("mov %w0, %%gs" :: "q" (sel));
+
   return 0;
 }
 
 /* Code to initially initialize the thread pointer.  This might need
    special attention since 'errno' is not yet available and if the
    operation can cause a failure 'errno' must not be touched.  */
-# define TLS_INIT_TP(descr, secondcall) \
-    _hurd_tls_init ((tcbhead_t *) (descr), (secondcall))
-# define TLS_INIT_TP_EXPENSIVE 1
+# define TLS_INIT_TP(descr) \
+    _hurd_tls_init ((tcbhead_t *) (descr))
 
 /* Return the TCB address of the current thread.  */
 # define THREAD_SELF                                                         \