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+/* Definition for thread-local data handling. NPTL/RISCV32 version.
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+ Copyright (C) 2005, 2007, 2011 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef _TLS_H
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+#define _TLS_H 1
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+
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+#ifndef __ASSEMBLER__
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+# include <stdbool.h>
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+# include <stddef.h>
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+# include <stdint.h>
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+
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+/* Type for the dtv. */
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+typedef union dtv
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+{
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+ size_t counter;
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+ struct
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+ {
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+ void *val;
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+ bool is_static;
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+ } pointer;
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+} dtv_t;
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+
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+typedef struct
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+{
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+ dtv_t *dtv;
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+} tcbhead_t;
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+
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+register tcbhead_t *__thread_self __asm__("tp");
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+
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+# define TLS_MULTIPLE_THREADS_IN_TCB 1
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+
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+#else /* __ASSEMBLER__ */
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+# include <tcb-offsets.h>
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+#endif /* __ASSEMBLER__ */
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+
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+/* We require TLS support in the tools. */
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+#define HAVE_TLS_SUPPORT 1
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+#define HAVE_TLS_MODEL_ATTRIBUTE 1
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+#define HAVE___THREAD 1
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+
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+/* Signal that TLS support is available. */
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+#define USE_TLS 1
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+
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+#ifndef __ASSEMBLER__
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+
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+/* Get system call information. */
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+# include <sysdep.h>
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+
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+/* The TP points to the start of the TLS block.
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+ * As I understand it, this isn't strictly that "TP points to DTV" - it's
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+ * more where to place the TCB in the TLS block. This will place it in
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+ * the beginning.
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+ *
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+ * Layout:
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+ * ------------------------------------
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+ * | PRE | TCB | TLS MEMORY .. |
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+ * ------------------------------------
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+ * ^ x4 / TP
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+ *
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+ * PRE is the struct pthread described below
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+ * TCB is tcbhead_t
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+ * TLS memory is where the TLS program sections are loaded
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+ *
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+ * See _dl_allocate_tls_storage and __libc_setup_tls for more information.
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+ */
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+# define TLS_DTV_AT_TP 1
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+
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+/* Get the thread descriptor definition. */
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+# include <../../descr.h>
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+
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+/* Requirements for the TCB. */
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+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
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+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
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+
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+# define TLS_TCB_SIZE sizeof (tcbhead_t)
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+# define TLS_TCB_ALIGN __alignof__ (tcbhead_t)
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+
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+/* This is the size of the TCB. */
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+
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+/* This is the size we need before TCB.
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+ * To support THREAD_GETMEM with friends we want to have a
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+ * struct pthread available.
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+ * Yank it in infront of everything, I'm sure nobody will mind.
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+ *
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+ * This memory is really allocated PRE the TLS block, so it's possible
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+ * to do ((char*)tlsblock) - TLS_PRE_TCB_SIZE to access it.
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+ * This is done for THREAD_SELF. */
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+# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
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+
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+
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+/* Install the dtv pointer.
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+ * When called, dtvp is a pointer not the DTV per say (which should start
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+ * with the generation counter) but to the length of the DTV.
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+ * We can always index with -1, so we store dtvp[1]
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+ */
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+# define INSTALL_DTV(tcbp, dtvp) \
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+ (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
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+
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+/* Install new dtv for current thread
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+ * In a logicial world dtv here would also point to the length of the DTV.
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+ * However it does not, this time it points to the generation counter,
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+ * so just store it.
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+ *
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+ * Note: -1 is still valid and contains the length. */
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+# define INSTALL_NEW_DTV(dtv) \
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+ (THREAD_DTV() = (dtv))
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+
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+/* Return dtv of given thread descriptor. */
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+# define GET_DTV(tcbp) \
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+ (((tcbhead_t *) (tcbp))->dtv)
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+
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+/* Code to initially initialize the thread pointer.
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+ *
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+ * Set TP to the address _after_ tcbhead_t. This will allow us
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+ * to change the size of tcbhead_t without having to re-link everything.
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+ *
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+ * secondcall has something to do with USE__THREAD,
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+ * seems to always be 0 so we don't care about it.
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+ *
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+ * This has to return NULL on success (or a string with the failure text).
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+ * It's hard to fail this, so return NULL always.
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+ */
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+# define TLS_INIT_TP(tcbp, secondcall) \
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+ ({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;})
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+
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+/* Return the address of the dtv for the current thread.
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+ *
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+ * Dereference TP, offset to dtv - really straightforward.
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+ * Remember that we made TP point to after tcb, so we need to reverse that.
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+ */
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+# define THREAD_DTV() \
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+ ((((tcbhead_t *)__thread_self)-1)->dtv)
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+
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+/* Return the thread descriptor for the current thread.
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+ *
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+ * Return a pointer to the TLS_PRE area where we allocated space for
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+ * a struct pthread. Again, TP points to after tcbhead_t, compensate with
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+ * TLS_INIT_TCB_SIZE.
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+ *
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+ * I regard this is a seperate system from the "normal" TLS.
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+ */
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+# define THREAD_SELF \
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+ ((struct pthread *) ((char *) __thread_self - TLS_INIT_TCB_SIZE \
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+ - TLS_PRE_TCB_SIZE))
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+
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+/* Magic for libthread_db to know how to do THREAD_SELF. */
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+# define DB_THREAD_SELF \
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+ CONST_THREAD_AREA (64, sizeof (struct pthread))
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+
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+/* Access to data in the thread descriptor is easy. */
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+#define THREAD_GETMEM(descr, member) \
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+ descr->member
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+#define THREAD_GETMEM_NC(descr, member, idx) \
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+ descr->member[idx]
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+#define THREAD_SETMEM(descr, member, value) \
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+ descr->member = (value)
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+#define THREAD_SETMEM_NC(descr, member, idx, value) \
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+ descr->member[idx] = (value)
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+
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+/* Get and set the global scope generation counter in struct pthread. */
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+#define THREAD_GSCOPE_FLAG_UNUSED 0
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+#define THREAD_GSCOPE_FLAG_USED 1
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+#define THREAD_GSCOPE_FLAG_WAIT 2
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+#define THREAD_GSCOPE_RESET_FLAG() \
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+ do \
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+ { int __res \
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+ = atomic_exchange_rel (&THREAD_SELF->header.gscope_flag, \
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+ THREAD_GSCOPE_FLAG_UNUSED); \
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+ if (__res == THREAD_GSCOPE_FLAG_WAIT) \
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+ lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE); \
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+ } \
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+ while (0)
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+#define THREAD_GSCOPE_SET_FLAG() \
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+ do \
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+ { \
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+ THREAD_SELF->header.gscope_flag = THREAD_GSCOPE_FLAG_USED; \
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+ atomic_write_barrier (); \
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+ } \
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+ while (0)
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+#define THREAD_GSCOPE_WAIT() \
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+ GL(dl_wait_lookup_done) ()
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+
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+#endif /* __ASSEMBLER__ */
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+
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+#endif /* tls.h */
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+
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