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or1k: Thread Local Storage support
OpenRISC includes 3 TLS addressing models. Local Dynamic optimizations are not done in the linker and therefore use the same code sequences as Global Dynamic. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Stafford Horne
parent
de5c0edc80
commit
96882a00ce
27
sysdeps/or1k/dl-tls.h
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27
sysdeps/or1k/dl-tls.h
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/* TLS definitions for the ELF dynamic linker. OpenRISC version.
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Copyright (C) 2022 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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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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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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<https://www.gnu.org/licenses/>. */
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/* Type used for the representation of TLS information in the GOT. */
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typedef struct
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{
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unsigned long int ti_module;
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unsigned long int ti_offset;
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} tls_index;
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extern void *__tls_get_addr (tls_index *ti);
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34
sysdeps/or1k/libc-tls.c
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34
sysdeps/or1k/libc-tls.c
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/* Thread-local storage handling in the ELF dynamic linker.
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OpenRISC version.
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Copyright (C) 2022 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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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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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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<https://www.gnu.org/licenses/>. */
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#include <csu/libc-tls.c>
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#include <dl-tls.h>
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/* On OpenRISC, linker optimizations are not required, so __tls_get_addr
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can be called even in statically linked binaries. In this case module
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must be always 1 and PT_TLS segment exist in the binary, otherwise it
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would not link. */
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void *
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__tls_get_addr (tls_index *ti)
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{
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dtv_t *dtv = THREAD_DTV ();
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return (char *) dtv[1].pointer.val + ti->ti_offset;
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}
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184
sysdeps/or1k/nptl/tls.h
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184
sysdeps/or1k/nptl/tls.h
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/* Definition for thread-local data handling. NPTL/OpenRISC version.
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Copyright (C) 2022 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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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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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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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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<https://www.gnu.org/licenses/>. */
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#ifndef _TLS_H
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#define _TLS_H 1
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#include <dl-sysdep.h>
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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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# include <dl-dtv.h>
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typedef struct
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{
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dtv_t *dtv;
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void *__padding[3];
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} tcbhead_t;
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register tcbhead_t *__thread_self __asm__("r10");
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# define TLS_MULTIPLE_THREADS_IN_TCB 1
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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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Layout:
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+-----+-----+----------------------+
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| PRE | TCB | TLS MEMORY .. |
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+-----+-----+----------------------+
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^ r10 / TP
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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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See _dl_allocate_tls_storage and __libc_setup_tls for more information. */
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# define TLS_DTV_AT_TP 1
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# define TLS_TCB_AT_TP 0
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/* Get the thread descriptor definition. */
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# include <nptl/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__ (struct pthread)
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# define TLS_TCB_SIZE sizeof (tcbhead_t)
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# define TLS_TCB_ALIGN __alignof__ (struct pthread)
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/* This is the size of the TCB. */
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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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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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/* 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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# define INSTALL_DTV(tcbp, dtvp) \
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(((tcbhead_t *) (tcbp))->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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Note: -1 is still valid and contains the length. */
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# define INSTALL_NEW_DTV(dtv) (THREAD_DTV() = (dtv))
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/* Return dtv of given thread descriptor. */
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# define GET_DTV(tcbp) (((tcbhead_t *) (tcbp))->dtv)
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/* Code to initially initialize the thread pointer.
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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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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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# define TLS_INIT_TP(tcbp) \
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({__thread_self = ((tcbhead_t *)tcbp + 1); NULL;})
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/* Value passed to 'clone' for initialization of the thread register. */
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# define TLS_DEFINE_INIT_TP(tp, pd) \
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void *tp = ((char *) pd + TLS_PRE_TCB_SIZE + TLS_INIT_TCB_SIZE)
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/* Return the address of the dtv for the current thread.
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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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# define THREAD_DTV() \
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((((tcbhead_t *)__thread_self)-1)->dtv)
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/* Return the thread descriptor for the current thread.
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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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I regard this is a seperate system from the "normal" TLS. */
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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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/* Magic for libthread_db to know how to do THREAD_SELF. */
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# define DB_THREAD_SELF \
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REGISTER (32, 32, 10 * 4, - TLS_INIT_TCB_SIZE - TLS_PRE_TCB_SIZE)
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# include <tcb-access.h>
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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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/* 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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{ \
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int __res = 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, \
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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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#endif /* __ASSEMBLER__ */
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#endif /* tls.h */
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34
sysdeps/or1k/stackinfo.h
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34
sysdeps/or1k/stackinfo.h
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@ -0,0 +1,34 @@
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/* Stack definitions for OpenRISC.
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Copyright (C) 2022 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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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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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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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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<https://www.gnu.org/licenses/>. */
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/* This file contains a bit of information about the stack allocation
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of the processor. */
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#ifndef _STACKINFO_H
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#define _STACKINFO_H 1
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#include <elf.h>
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/* On or1k the stack grows down. */
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#define _STACK_GROWS_DOWN 1
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/* Default to an executable stack. PF_X can be overridden if PT_GNU_STACK is
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present, but it is presumed absent. */
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#define DEFAULT_STACK_PERMS (PF_R | PF_W | PF_X)
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#endif /* stackinfo.h */
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