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authorWaldemar Brodkorb <wbx@openadk.org>2016-05-28 18:12:58 +0200
committerWaldemar Brodkorb <wbx@uclibc-ng.org>2016-11-04 00:03:07 +0100
commitb8fcdddcbb192fc367ff04bbd753b9deb69b09f3 (patch)
tree8febdb9d4e3d090e9273c29df9ff06116196c8e4 /libpthread/nptl/sysdeps/nios2/tls.h
parent191739597c6d380692885cfdd8dd8aa4f31f029d (diff)
nios2: sync support with glibc
Only static linking is supported for now. More debugging and analyzing for ld.so, TLS and NPTL is required. But at least you can bootup a static root fileystem in Qemu.
Diffstat (limited to 'libpthread/nptl/sysdeps/nios2/tls.h')
-rw-r--r--libpthread/nptl/sysdeps/nios2/tls.h178
1 files changed, 178 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/nios2/tls.h b/libpthread/nptl/sysdeps/nios2/tls.h
new file mode 100644
index 000000000..9785670b8
--- /dev/null
+++ b/libpthread/nptl/sysdeps/nios2/tls.h
@@ -0,0 +1,178 @@
+/* Definition for thread-local data handling. NPTL/Nios II version.
+ Copyright (C) 2012-2016 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;
+
+#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 thread blocks. */
+# define TLS_DTV_AT_TP 1
+
+/* Get the thread descriptor definition. */
+# include <../../descr.h>
+
+typedef struct
+{
+ dtv_t *dtv;
+ uintptr_t pointer_guard;
+ unsigned spare[6];
+} tcbhead_t;
+
+register struct pthread *__thread_self __asm__("r23");
+
+#define READ_THREAD_POINTER() ((void *) __thread_self)
+
+/* This is the size of the initial TCB. Because our TCB is before the thread
+ pointer, we don't need this. */
+# define TLS_INIT_TCB_SIZE 0
+
+/* Alignment requirements for the initial TCB. */
+# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
+
+/* This is the size of the TCB. Because our TCB is before the thread
+ pointer, we don't need this. */
+# define TLS_TCB_SIZE 0
+
+/* Alignment requirements for the TCB. */
+# define TLS_TCB_ALIGN __alignof__ (struct pthread)
+
+/* This is the size we need before TCB - actually, it includes the TCB. */
+# define TLS_PRE_TCB_SIZE \
+ (sizeof (struct pthread) \
+ + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1)))
+
+/* The thread pointer (in hardware register r23) points to the end of
+ the TCB + 0x7000, as for PowerPC and MIPS. */
+# define TLS_TCB_OFFSET 0x7000
+
+/* 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. */
+# define TLS_INIT_TP(tcbp, secondcall) \
+ (__thread_self = (struct pthread *) ((char *) tcbp + TLS_TCB_OFFSET), NULL)
+
+/* Value passed to 'clone' for initialization of the thread register. */
+# define TLS_DEFINE_INIT_TP(tp, pd) \
+ void *tp = (void *) (pd) + TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE
+
+/* 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. */
+# define THREAD_SELF \
+ ((struct pthread *) (READ_THREAD_POINTER () \
+ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
+
+/* Magic for libthread_db to know how to do THREAD_SELF. */
+# define DB_THREAD_SELF \
+ REGISTER (32, 32, 23 * 4, -TLS_PRE_TCB_SIZE - TLS_TCB_OFFSET)
+
+/* 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)
+
+# define THREAD_GET_POINTER_GUARD() \
+ (((tcbhead_t *) (READ_THREAD_POINTER () \
+ - TLS_TCB_OFFSET))[-1].pointer_guard)
+# define THREAD_SET_POINTER_GUARD(value) \
+ (THREAD_GET_POINTER_GUARD () = (value))
+# define THREAD_COPY_POINTER_GUARD(descr) \
+ (((tcbhead_t *) ((void *) (descr) \
+ + TLS_PRE_TCB_SIZE))[-1].pointer_guard \
+ = THREAD_GET_POINTER_GUARD())
+
+/* l_tls_offset == 0 is perfectly valid on Nios II, so we have to use some
+ different value to mean unset l_tls_offset. */
+# define NO_TLS_OFFSET -1
+
+/* 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 */