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@@ -1,6 +1,5 @@
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/* Definition for thread-local data handling. NPTL/RISCV64 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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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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@@ -35,15 +34,6 @@ typedef union dtv
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} pointer;
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} dtv_t;
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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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@@ -58,71 +48,56 @@ register tcbhead_t *__thread_self __asm__("tp");
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#ifndef __ASSEMBLER__
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+register void *__thread_self __asm__("tp");
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+# define READ_THREAD_POINTER() ({ __thread_self; })
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+
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/* Get system call information. */
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# include <sysdep.h>
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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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+/* The TP points to the start of the TLS block. */
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# define TLS_DTV_AT_TP 1
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/* Get the thread descriptor definition. */
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# include <../../descr.h>
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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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+typedef struct
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+{
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+ dtv_t *dtv;
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+ void *private;
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+} tcbhead_t;
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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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+/* This is the size of the initial TCB. Because our TCB is before the thread
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+ pointer, we don't need this. */
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+# define TLS_INIT_TCB_SIZE 0
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+# define TLS_INIT_TCB_ALIGN __alignof__ (struct pthread)
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-/* This is the size of the TCB. */
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+/* This is the size of the TCB. Because our TCB is before the thread
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+ pointer, we don't need this. */
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+# define TLS_TCB_SIZE 0
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+# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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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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+/* This is the size we need before TCB - actually, it includes the TCB. */
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+# define TLS_PRE_TCB_SIZE \
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+ (sizeof (struct pthread) \
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+ + ((sizeof (tcbhead_t) + __alignof (struct pthread) - 1) \
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+ & ~(__alignof (struct pthread) - 1)))
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+/* The thread pointer tp points to the end of the TCB.
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+ The pthread_descr structure is immediately in front of the TCB. */
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+# define TLS_TCB_OFFSET 0
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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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+/* Install the dtv pointer. The pointer passed is to the element with
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+ index -1 which contain the length. */
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# define INSTALL_DTV(tcbp, dtvp) \
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- (((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1)
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+ (((tcbhead_t *) (tcbp))[-1].dtv = (dtvp) + 1)
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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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+/* Install new dtv for current thread */
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# define INSTALL_NEW_DTV(dtv) \
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(THREAD_DTV() = (dtv))
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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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+ (((tcbhead_t *) (tcbp))[-1].dtv)
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/* Code to initially initialize the thread pointer.
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*
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@@ -136,31 +111,21 @@ register tcbhead_t *__thread_self __asm__("tp");
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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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+ ({ __thread_self = (char*)tcbp + TLS_TCB_OFFSET; NULL; })
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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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+/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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- ((((tcbhead_t *)__thread_self)-1)->dtv)
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+ (((tcbhead_t *) (READ_THREAD_POINTER () - TLS_TCB_OFFSET))[-1].dtv)
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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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+/* Return the thread descriptor for the current thread. */
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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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+ ((struct pthread *) (READ_THREAD_POINTER () \
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+ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE))
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-/* Magic for libthread_db to know how to do THREAD_SELF. */
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+/* Informs libthread_db that the thread pointer is register 4, which is used
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+ * 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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+ REGISTER (64, 64, 4 * 8, - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)
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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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@@ -172,6 +137,10 @@ register tcbhead_t *__thread_self __asm__("tp");
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#define THREAD_SETMEM_NC(descr, member, idx, value) \
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descr->member[idx] = (value)
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+/* l_tls_offset == 0 is perfectly valid, so we have to use some different
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+ value to mean unset l_tls_offset. */
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+# define NO_TLS_OFFSET -1
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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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Waldemar Brodkorb