[PATCH] PPC64 Linuxthreads tls.h

[Steven Munroe <sjmunroe at us dot ibm dot com>]

PPC64 linuxthreads enabling for --with-tls.

2003-02-25  Steven Munroe  <sjmunroe at us dot ibm dot com>

        * sysdeps/powerpc/powerpc64/tls.h: New file.

-- 
Steven Munroe
sjmunroe at us dot ibm dot com
Linux on PowerPC-64 Development
GLIBC for PowerPC-64 Development

diff -rupP libc23-cvstip-20030221/linuxthreads/sysdeps/powerpc/powerpc64/tls.h libc23/linuxthreads/sysdeps/powerpc/powerpc64/tls.h
--- libc23-cvstip-20030221/linuxthreads/sysdeps/powerpc/powerpc64/tls.h	1969-12-31 18:00:00.000000000 -0600
+++ libc23/linuxthreads/sysdeps/powerpc/powerpc64/tls.h	2003-02-25 13:43:11.000000000 -0600
@@ -0,0 +1,144 @@
+/* Definitions for thread-local data handling.  
+   linuxthreads/PowerPC64 version.
+   Copyright (C) 2002, 2003 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
+
+#ifndef __ASSEMBLER__
+
+# include <pt-machine.h>
+# include <stddef.h>
+
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  void *pointer;
+} dtv_t;
+
+
+typedef struct
+{
+  dtv_t *dtv;
+
+  /* Reserved for the thread implementation.  Unused in LinuxThreads.  */
+  void *private;
+} 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>
+
+/* 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 (tcbhead_t)
+
+/* Alignment requirements for the TCB.  */
+#  define TLS_TCB_ALIGN		__alignof__ (tcbhead_t)
+
+/* This is the size we need before TCB.  */
+#  define TLS_PRE_TCB_SIZE	sizeof (struct _pthread_descr_struct)
+
+/* the following assumes that TP (R13) is points to the end of the tcb
+   + 0x7000 (per the ABI).  This implies that tcb address is 
+   R13-(TLS_TCB_SIZE + 0x7000).  As we define TLS_DTV_AT_TP we can 
+   assume that the pthread_descr is allocate immediately ahead of the 
+   tcb.  This implies that the pthread_descr address is 
+   R13-(TLS_PRE_TCB_SIZE + TLS_TCB_SIZE + 0x7000).  */
+#  define TLS_TCB_OFFSET 0x7000
+
+/* The DTV is allocated at the TP; the TCB is placed elsewhere.  */
+/* This is not really true for powerpc64.  We are following alpha
+   where the DTV pointer is first doubleword in the TCB.  */
+#  define TLS_DTV_AT_TP 1 
+
+/* Dynamic thread vector pointers point 0x8000 past the start of each 
+   TLS block.  */
+#  define TLS_DTV_OFFSET 0x8000
+
+/* Install the dtv pointer.  The pointer passed is to the element with
+   index -1 which contain the length.  */
+#  define INSTALL_DTV(TCBP, DTVP) \
+  (((tcbhead_t *) (TCBP))->dtv = (DTVP) + 1)
+
+/* Install new dtv for current thread.  */
+#  define INSTALL_NEW_DTV(DTV) \
+    (((tcbhead_t *) (((char *)__thread_self) \
+    - (TLS_TCB_OFFSET + TLS_TCB_SIZE)))->dtv = (DTV))
+
+/* Return dtv of given thread descriptor.  */
+#  define GET_DTV(TCBP) \
+  (((tcbhead_t *) (TCBP))->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(TCBP, SECONDCALL) \
+    (__thread_self = (pthread_descr) (((char *)(TCBP)) \
+    + (TLS_TCB_OFFSET + TLS_TCB_SIZE)), 0)
+
+/* Return the address of the dtv for the current thread.  */
+#  define THREAD_DTV() \
+    (((tcbhead_t *) (((char *)__thread_self) \
+    - (TLS_TCB_OFFSET + TLS_TCB_SIZE)))->dtv)
+
+/* Return the thread descriptor for the current thread.  */
+#  undef THREAD_SELF
+#  define THREAD_SELF \
+    ((pthread_descr) (((char *)__thread_self) \
+    - (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
+
+#  undef INIT_THREAD_SELF
+#  define INIT_THREAD_SELF(DESCR, NR) \
+    (__thread_self = (pthread_descr) (((char *)(DESCR)) \
+    + (TLS_TCB_OFFSET + TLS_TCB_SIZE + TLS_PRE_TCB_SIZE)))
+
+/* Get the thread descriptor definition.  */
+#  include <linuxthreads/descr.h>
+
+/* Generic bits of LinuxThreads may call these macros with
+   DESCR set to NULL.  We are expected to be able to reference
+   the "current" value.  */
+
+#define THREAD_GETMEM(descr, member) \
+  ((void) sizeof (descr), THREAD_SELF->member)
+#define THREAD_GETMEM_NC(descr, member) \
+  ((void) sizeof (descr), THREAD_SELF->member)
+#define THREAD_SETMEM(descr, member, value) \
+  ((void) sizeof (descr), THREAD_SELF->member = (value))
+#define THREAD_SETMEM_NC(descr, member, value) \
+  ((void) sizeof (descr), THREAD_SELF->member = (value))
+
+# endif	/* HAVE_TLS_SUPPORT */
+#endif /* __ASSEMBLER__ */
+
+#endif	/* tls.h */