| /* Definition for thread-local data handling. NPTL/MIPS 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> |
| |
| /* Get system call information. */ |
| # include <sysdep.h> |
| |
| #ifdef __mips16 |
| /* MIPS16 uses GCC builtin to access the TP. */ |
| # define READ_THREAD_POINTER() (__builtin_thread_pointer ()) |
| #else |
| /* Note: rd must be $v1 to be ABI-conformant. */ |
| # if __mips_isa_rev >= 2 |
| # define READ_THREAD_POINTER() \ |
| ({ void *__result; \ |
| asm volatile ("rdhwr\t%0, $29" : "=v" (__result)); \ |
| __result; }) |
| # else |
| # define READ_THREAD_POINTER() \ |
| ({ void *__result; \ |
| asm volatile (".set\tpush\n\t.set\tmips32r2\n\t" \ |
| "rdhwr\t%0, $29\n\t.set\tpop" : "=v" (__result)); \ |
| __result; }) |
| # endif |
| #endif |
| |
| #else /* __ASSEMBLER__ */ |
| # include <tcb-offsets.h> |
| |
| # if __mips_isa_rev >= 2 |
| # define READ_THREAD_POINTER(rd) rdhwr rd, $29 |
| # else |
| # define READ_THREAD_POINTER(rd) \ |
| .set push; \ |
| .set mips32r2; \ |
| rdhwr rd, $29; \ |
| .set pop |
| # endif |
| #endif /* __ASSEMBLER__ */ |
| |
| |
| #ifndef __ASSEMBLER__ |
| |
| /* 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. 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 $29) points to the end of |
| the TCB + 0x7000, as for PowerPC. The pthread_descr structure is |
| immediately in front of the TCB. */ |
| # 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. 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) \ |
| ({ INTERNAL_SYSCALL_DECL (err); \ |
| long result_var; \ |
| result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \ |
| (char *) (tcbp) + TLS_TCB_OFFSET); \ |
| INTERNAL_SYSCALL_ERROR_P (result_var, err) \ |
| ? "unknown error" : 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 \ |
| CONST_THREAD_AREA (32, TLS_TCB_OFFSET + TLS_PRE_TCB_SIZE) |
| |
| /* 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) |
| |
| /* l_tls_offset == 0 is perfectly valid on MIPS, 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 */ |