2002-09-24 Roland McGrath <roland@redhat.com>
authorroland <roland>
Wed, 25 Sep 2002 01:58:31 +0000 (01:58 +0000)
committerroland <roland>
Wed, 25 Sep 2002 01:58:31 +0000 (01:58 +0000)
* sysdeps/x86_64/tls.h: New file.

linuxthreads/sysdeps/x86_64/tls.h [new file with mode: 0644]

diff --git a/linuxthreads/sysdeps/x86_64/tls.h b/linuxthreads/sysdeps/x86_64/tls.h
new file mode 100644 (file)
index 0000000..17773d5
--- /dev/null
@@ -0,0 +1,119 @@
+/* Definitions for thread-local data handling.  linuxthreads/x86-64 version.
+   Copyright (C) 2002 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
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   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.  */
+
+#ifndef _TLS_H
+#define _TLS_H
+
+# include <pt-machine.h>
+
+#ifndef __ASSEMBLER__
+# include <stddef.h>
+
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  void *pointer;
+} dtv_t;
+
+
+typedef struct
+{
+  void *tcb;           /* Pointer to the TCB.  Not necessary the
+                          thread descriptor used by libpthread.  */
+  dtv_t *dtv;
+  void *self;          /* Pointer to the thread descriptor.  */
+} tcbhead_t;
+#endif
+
+
+#ifdef HAVE_TLS_SUPPORT
+
+/* Signal that TLS support is available.  */
+# define USE_TLS       1
+
+# ifndef __ASSEMBLER__
+/* Get system call information.  */
+#  include <sysdep.h>
+
+/* Get the thread descriptor definition.  */
+#  include <linuxthreads/descr.h>
+
+/* This is the size of the initial TCB.  */
+#  define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+
+/* Alignment requirements for the initial TCB.  */
+#  define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
+
+/* This is the size of the TCB.  */
+#  define TLS_TCB_SIZE sizeof (struct _pthread_descr_struct)
+
+/* Alignment requirements for the TCB.  */
+#  define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct)
+
+/* 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
+
+
+/* Install the dtv pointer.  The pointer passed is to the element with
+   index -1 which contain the length.  */
+#  define INSTALL_DTV(descr, dtvp) \
+  ((tcbhead_t *) (descr))->dtv = (dtvp) + 1
+
+/* Install new dtv for current thread.  */
+#  define INSTALL_NEW_DTV(dtv) \
+  ({ struct _pthread_descr_struct *__descr;                                  \
+     THREAD_SETMEM (__descr, p_header.data.dtvp, (dtv)); })
+
+/* Return dtv of given thread descriptor.  */
+#  define GET_DTV(descr) \
+  (((tcbhead_t *) (descr))->dtv)
+
+/* 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)                                              \
+  ({                                                                         \
+    void *_descr = (descr);                                                  \
+    tcbhead_t *head = _descr;                                                \
+    long int _result;                                                        \
+                                                                             \
+    head->tcb = _descr;                                                              \
+    /* For now the thread descriptor is at the same address.  */             \
+    head->self = _descr;                                                     \
+                                                                             \
+    asm volatile ("syscall"                                                  \
+                 : "=a" (_result)                                            \
+                 : "0" ((unsigned long int) __NR_arch_prctl),                \
+                   "D" ((unsigned long int) ARCH_SET_FS),                    \
+                   "S" (_descr)                                              \
+                 : "memory", "cc", "r11", "cx");                             \
+    _result ? -1 : 0;                                                        \
+  })
+
+/* Return the address of the dtv for the current thread.  */
+#  define THREAD_DTV() \
+  ({ struct _pthread_descr_struct *__descr;                                  \
+     THREAD_GETMEM (__descr, p_header.data.dtvp); })
+
+# endif        /* HAVE_TLS_SUPPORT */
+#endif /* __ASSEMBLER__ */
+
+#endif /* tls.h */