Revert "resolve merge"

This reverts commit 6b6ede3d15f04fe825cfa9f697507457e3640344.

1 files changed, 169 insertions, 0 deletions

diff --git a/libpthread/linuxthreads/sysdeps/mips/tls.h b/libpthread/linuxthreads/sysdeps/mips/tls.h
new file mode 100644
index 000000000..4e7887a74
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/mips/tls.h
@@ -0,0 +1,169 @@
+/* Definitions for thread-local data handling.  linuxthreads/MIPS version.
+   Copyright (C) 2005 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _TLS_H
+#define _TLS_H
+
+#ifndef __ASSEMBLER__
+
+# include <stdbool.h>
+# include <pt-machine.h>
+# include <stddef.h>
+
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  struct
+  {
+    void *val;
+    bool is_static;
+  } pointer;
+} dtv_t;
+
+# define READ_THREAD_POINTER() \
+    ({ void *__result;							      \
+       __asm__ __volatile__ (".set\tpush\n\t.set\tmips32r2\n\t"			      \
+		     "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result));	      \
+       __result; })
+
+#else /* __ASSEMBLER__ */
+# include <tcb-offsets.h>
+
+/* Note: rd must be $v1 to be ABI-conformant.  */
+# define READ_THREAD_POINTER(rd) \
+	.set	push;							      \
+	.set	mips32r2;						      \
+	rdhwr	rd, $29;						      \
+	.set	pop
+#endif /* __ASSEMBLER__ */
+
+/* LinuxThreads can only use TLS if both floating stacks (in the MIPS case,
+   that means support for "rdhwr") and support from the tools are available.
+
+   We have to define USE_TLS consistently, or ldsodefs.h will lay out types
+   differently between an NPTL build and a LinuxThreads build.  It can be set
+   for libc.so and not libpthread.so, but only if we provide appropriate padding
+   in the _pthread_descr_struct.
+
+   Currently nothing defines FLOATING_STACKS.  We could assume this based on
+   kernel version once the TLS patches are available in kernel.org, but
+   it hardly seems worth it.  Use NPTL if you can.
+
+   To avoid bothering with the TLS support code at all, use configure
+   --without-tls.  */
+
+#if defined HAVE_TLS_SUPPORT \
+    && (defined FLOATING_STACKS || !defined IS_IN_libpthread)
+
+/* Signal that TLS support is available.  */
+# define USE_TLS	1
+
+/* Include padding in _pthread_descr_struct so that libc can find p_errno,
+   if libpthread will only include the padding because of the !IS_IN_libpthread
+   check.  */
+#ifndef FLOATING_STACKS
+# define INCLUDE_TLS_PADDING	1
+#endif
+
+# ifndef __ASSEMBLER__
+
+/* This layout is actually wholly private and not affected by the ABI.
+   Nor does it overlap the pthread data structure, so we need nothing
+   extra here at all.  */
+typedef struct
+{
+  dtv_t *dtv;
+  void *private;
+} tcbhead_t;
+
+/* This is the size of the initial TCB.  */
+#  define TLS_INIT_TCB_SIZE	0
+
+/* Alignment requirements for the initial TCB.  */
+#  define TLS_INIT_TCB_ALIGN	__alignof__ (struct _pthread_descr_struct)
+
+/* This is the size of the TCB.  */
+#  define TLS_TCB_SIZE		0
+
+/* Alignment requirements for the TCB.  */
+#  define TLS_TCB_ALIGN		__alignof__ (struct _pthread_descr_struct)
+
+/* This is the size we need before TCB.  */
+#  define TLS_PRE_TCB_SIZE \
+  (sizeof (struct _pthread_descr_struct)				      \
+   + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
+
+/* The thread pointer (in hardware register $29) points to the end of
+   the TCB + 0x7000, as for PowerPC.  The pthread_descr structure is
+   immediately in front of the TCB.  */
+#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
+
+/* 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))[-1].dtv = (DTVP) + 1)
+
+/* Install new dtv for current thread.  */
+#  define INSTALL_NEW_DTV(DTV) (THREAD_DTV() = (DTV))
+
+/* Return dtv of given thread descriptor.  */
+#  define GET_DTV(TCBP)	(((tcbhead_t *) (TCBP))[-1].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) \
+  ({ INTERNAL_SYSCALL_DECL (err);					\
+     long result_var;							\
+     result_var = INTERNAL_SYSCALL (set_thread_area, err, 1,		\
+				    (char *) (tcbp) + TLS_TCB_OFFSET);	\
+     INTERNAL_SYSCALL_ERROR_P (result_var, err)				\
+       ? "unknown error" : NULL; })
+
+/* Return the address of the dtv for the current thread.  */
+# define THREAD_DTV() \
+  (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
+
+/* Return the thread descriptor for the current thread.  */
+#  undef THREAD_SELF
+#  define THREAD_SELF \
+    ((pthread_descr) (READ_THREAD_POINTER () \
+		      - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
+
+/* Get the thread descriptor definition.  */
+#  include <linuxthreads/descr.h>
+
+/* l_tls_offset == 0 is perfectly valid on MIPS, so we have to use some
+   different value to mean unset l_tls_offset.  */
+#  define NO_TLS_OFFSET	-1
+
+/* Initializing the thread pointer requires a syscall which may not be
+   available, so don't do it if we don't need to.  */
+#  define TLS_INIT_TP_EXPENSIVE 1
+
+# endif /* __ASSEMBLER__ */
+
+#endif /* HAVE_TLS_SUPPORT */
+
+#endif	/* tls.h */