| /* Definition for thread-local data handling. NPTL/hppa version. |
| Copyright (C) 2005-2018 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 |
| |
| #include <dl-sysdep.h> |
| |
| #ifndef __ASSEMBLER__ |
| # include <stdbool.h> |
| # include <stddef.h> |
| # include <stdint.h> |
| # include <dl-dtv.h> |
| |
| #else /* __ASSEMBLER__ */ |
| # include <tcb-offsets.h> |
| #endif /* __ASSEMBLER__ */ |
| |
| #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 |
| # define TLS_TCB_AT_TP 0 |
| |
| /* Get the thread descriptor definition. */ |
| # include <nptl/descr.h> |
| |
| typedef struct |
| { |
| dtv_t *dtv; |
| void *private; |
| } tcbhead_t; |
| |
| /* This is the size of the initial TCB. */ |
| # define TLS_INIT_TCB_SIZE sizeof (tcbhead_t) |
| |
| /* Alignment requirements for the initial TCB. */ |
| # define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t) |
| |
| /* This is the size of the TCB. */ |
| # define TLS_TCB_SIZE sizeof (tcbhead_t) |
| |
| /* Alignment requirements for the TCB. */ |
| # define TLS_TCB_ALIGN __alignof__ (struct pthread) |
| |
| /* This is the size we need before TCB */ |
| # define TLS_PRE_TCB_SIZE sizeof (struct pthread) |
| |
| /* 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))->dtv = (dtvp) + 1 |
| |
| /* Install new dtv for current thread. */ |
| # define INSTALL_NEW_DTV(dtv) \ |
| ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \ |
| __tcbp->dtv = dtv; \ |
| }) |
| |
| /* Return dtv of given thread descriptor. */ |
| # define GET_DTV(tcbp) \ |
| (((tcbhead_t *) (tcbp))->dtv) |
| |
| /* Code to initially initialize the thread pointer. This might need |
| special attention since 'errno' is not yet available and if the |
| operation can cause a failure 'errno' must not be touched. */ |
| # define TLS_INIT_TP(tcbp) \ |
| ({ __set_cr27(tcbp); NULL; }) |
| |
| /* Value passed to 'clone' for initialization of the thread register. */ |
| # define TLS_DEFINE_INIT_TP(tp, pd) void *tp = (pd) + 1 |
| |
| /* Return the address of the dtv for the current thread. */ |
| # define THREAD_DTV() \ |
| ({ tcbhead_t *__tcbp = (tcbhead_t *)__get_cr27(); \ |
| __tcbp->dtv; \ |
| }) |
| |
| /* Return the thread descriptor for the current thread. */ |
| # define THREAD_SELF \ |
| ({ struct pthread *__self; \ |
| __self = __get_cr27(); \ |
| __self - 1; \ |
| }) |
| |
| /* Magic for libthread_db to know how to do THREAD_SELF. |
| Our thread pointer is stored in cr27. See asm/elf.h for the offset into |
| elf_gregset_t. The thread descriptor is sizeof (struct pthread) away. */ |
| # define DB_THREAD_SELF \ |
| REGISTER (32, 32, 53 * 4, -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) |
| |
| static inline struct pthread *__get_cr27(void) |
| { |
| long cr27; |
| asm ("mfctl %%cr27, %0" : "=r" (cr27) : ); |
| return (struct pthread *) cr27; |
| } |
| |
| /* We write to cr27, clobber r26 as the input argument, and clobber |
| r31 as the link register. */ |
| static inline void __set_cr27(struct pthread *cr27) |
| { |
| asm ( "ble 0xe0(%%sr2, %%r0)\n\t" |
| "copy %0, %%r26" |
| : : "r" (cr27) : "r26", "r31" ); |
| } |
| |
| /* 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 */ |