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+/* Definition for thread-local data handling. NPTL/OR1K version.
+ Copyright (C) 2005, 2007, 2011 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 1
+
+#ifndef __ASSEMBLER__
+# include <stdbool.h>
+# include <stddef.h>
+# include <stdint.h>
+
+/* Type for the dtv. */
+typedef union dtv
+{
+ size_t counter;
+ struct
+ {
+ void *val;
+ bool is_static;
+ } pointer;
+} dtv_t;
+
+typedef struct
+{
+ dtv_t *dtv;
+} tcbhead_t;
+
+register tcbhead_t *__thread_self __asm__("r10");
+
+# define TLS_MULTIPLE_THREADS_IN_TCB 1
+
+#else /* __ASSEMBLER__ */
+# include <tcb-offsets.h>
+#endif /* __ASSEMBLER__ */
+
+/* We require TLS support in the tools. */
+#define HAVE_TLS_SUPPORT 1
+#define HAVE_TLS_MODEL_ATTRIBUTE 1
+#define HAVE___THREAD 1
+
+/* Signal that TLS support is available. */
+#define USE_TLS 1
+
+#ifndef __ASSEMBLER__
+
+/* Get system call information. */
+# include <sysdep.h>
+
+/* The TP points to the start of the TLS block.
+ * As I understand it, this isn't strictly that "TP points to DTV" - it's
+ * more where to place the TCB in the TLS block. This will place it in
+ * the beginning.
+ *
+ * Layout:
+ * ------------------------------------
+ * | PRE | TCB | TLS MEMORY .. |
+ * ------------------------------------
+ * ^ r10 / TP
+ *
+ * PRE is the struct pthread described below
+ * TCB is tcbhead_t
+ * TLS memory is where the TLS program sections are loaded
+ *
+ * See _dl_allocate_tls_storage and __libc_setup_tls for more information.
+ */
+# define TLS_DTV_AT_TP 1
+
+/* Get the thread descriptor definition. */
+# include <../../descr.h>
+
+/* Requirements for the TCB. */
+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
+
+# define TLS_TCB_SIZE sizeof (tcbhead_t)
+# define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
+
+/* This is the size of the TCB. */
+
+/* This is the size we need before TCB.
+ * To support THREAD_GETMEM with friends we want to have a
+ * struct pthread available.
+ * Yank it in infront of everything, I'm sure nobody will mind.
+ *
+ * This memory is really allocated PRE the TLS block, so it's possible
+ * to do ((char*)tlsblock) - TLS_PRE_TCB_SIZE to access it.
+ * This is done for THREAD_SELF. */
+# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
+
+
+/* Install the dtv pointer.
+ * When called, dtvp is a pointer not the DTV per say (which should start
+ * with the generation counter) but to the length of the DTV.
+ * We can always index with -1, so we store dtvp[1]
+ */
+# define INSTALL_DTV(tcbp, dtvp) \
+ (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
+
+/* Install new dtv for current thread
+ * In a logicial world dtv here would also point to the length of the DTV.
+ * However it does not, this time it points to the generation counter,
+ * so just store it.
+ *
+ * Note: -1 is still valid and contains the length. */
+# define INSTALL_NEW_DTV(dtv) \
+ (THREAD_DTV() = (dtv))
+
+/* Return dtv of given thread descriptor. */
+# define GET_DTV(tcbp) \
+ (((tcbhead_t *) (tcbp))->dtv)
+
+/* Code to initially initialize the thread pointer.
+ *
+ * Set TP to the address _after_ tcbhead_t. This will allow us
+ * to change the size of tcbhead_t without having to re-link everything.
+ *
+ * secondcall has something to do with USE__THREAD,
+ * seems to always be 0 so we don't care about it.
+ *
+ * This has to return NULL on success (or a string with the failure text).
+ * It's hard to fail this, so return NULL always.
+ */
+# define TLS_INIT_TP(tcbp, secondcall) \
+ ({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;})
+
+/* Return the address of the dtv for the current thread.
+ *
+ * Dereference TP, offset to dtv - really straightforward.
+ * Remember that we made TP point to after tcb, so we need to reverse that.
+ */
+# define THREAD_DTV() \
+ ((((tcbhead_t *)__thread_self)-1)->dtv)
+
+/* Return the thread descriptor for the current thread.
+ *
+ * Return a pointer to the TLS_PRE area where we allocated space for
+ * a struct pthread. Again, TP points to after tcbhead_t, compensate with
+ * TLS_INIT_TCB_SIZE.
+ *
+ * I regard this is a seperate system from the "normal" TLS.
+ */
+# define THREAD_SELF \
+ ((struct pthread *) ((char *) __thread_self - TLS_INIT_TCB_SIZE \
+ - TLS_PRE_TCB_SIZE))
+
+/* Magic for libthread_db to know how to do THREAD_SELF. */
+# define DB_THREAD_SELF \
+ CONST_THREAD_AREA (32, sizeof (struct pthread))
+
+/* Access to data in the thread descriptor is easy. */
+#define THREAD_GETMEM(descr, member) \
+ descr->member
+#define THREAD_GETMEM_NC(descr, member, idx) \
+ descr->member[idx]
+#define THREAD_SETMEM(descr, member, value) \
+ descr->member = (value)
+#define THREAD_SETMEM_NC(descr, member, idx, value) \
+ descr->member[idx] = (value)
+
+/* Get and set the global scope generation counter in struct pthread. */
+#define THREAD_GSCOPE_FLAG_UNUSED 0
+#define THREAD_GSCOPE_FLAG_USED 1
+#define THREAD_GSCOPE_FLAG_WAIT 2
+#define THREAD_GSCOPE_RESET_FLAG() \
+ do \
+ { int __res \
+ = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
+ THREAD_GSCOPE_FLAG_UNUSED); \
+ if (__res == THREAD_GSCOPE_FLAG_WAIT) \
+ lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
+ } \
+ while (0)
+#define THREAD_GSCOPE_SET_FLAG() \
+ do \
+ { \
+ THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
+ atomic_write_barrier (); \
+ } \
+ while (0)
+#define THREAD_GSCOPE_WAIT() \
+ GL(dl_wait_lookup_done) ()
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* tls.h */
+