/* Definition for thread-local data handling. NPTL/MIPS version. Copyright (C) 2005, 2007 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; /* Note: rd must be $v1 to be ABI-conformant. */ # 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; }) #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> # define READ_THREAD_POINTER(rd) \ .set push; \ .set mips32r2; \ rdhwr rd, $29; \ .set pop #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; 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, secondcall) \ ({ INTERNAL_SYSCALL_DECL (err); \ long result_var attribute_unused; \ result_var = INTERNAL_SYSCALL (set_thread_area, err, 1, \ (char *) (tcbp) + TLS_TCB_OFFSET); \ INTERNAL_SYSCALL_ERROR_P (result_var, err) \ ? "unknown error" : NULL; }) /* 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 */