/* Definition for thread-local data handling. NPTL/PowerPC version. Copyright (C) 2003, 2005, 2006, 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #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; #else /* __ASSEMBLER__ */ # include <tcb-offsets.h> #endif /* __ASSEMBLER__ */ /* We require TLS support in the tools. */ #ifndef HAVE_TLS_SUPPORT # error "TLS support is required." #endif /* 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 /* We use the multiple_threads field in the pthread struct */ #define TLS_MULTIPLE_THREADS_IN_TCB 1 /* Get the thread descriptor definition. */ # include <nptl/descr.h> /* The stack_guard is accessed directly by GCC -fstack-protector code, so it is a part of public ABI. The dtv and pointer_guard fields are private. */ typedef struct { uintptr_t pointer_guard; uintptr_t stack_guard; dtv_t *dtv; } tcbhead_t; /* This is the size of the initial TCB. */ # 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. */ # 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. */ # define TLS_PRE_TCB_SIZE \ (sizeof (struct pthread) \ + ((sizeof (tcbhead_t) + TLS_TCB_ALIGN - 1) & ~(TLS_TCB_ALIGN - 1))) # ifndef __powerpc64__ /* Register r2 (tp) is reserved by the ABI as "thread pointer". */ register void *__thread_register __asm__ ("r2"); # define PT_THREAD_POINTER PT_R2 # else /* Register r13 (tp) is reserved by the ABI as "thread pointer". */ register void *__thread_register __asm__ ("r13"); # define PT_THREAD_POINTER PT_R13 # endif /* The following assumes that TP (R2 or R13) points to the end of the TCB + 0x7000 (per the ABI). This implies that TCB address is TP - 0x7000. As we define TLS_DTV_AT_TP we can assume that the pthread struct is allocated immediately ahead of the TCB. This implies that the pthread_descr address is TP - (TLS_PRE_TCB_SIZE + 0x7000). */ # 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) \ (__thread_register = (void *) (tcbp) + TLS_TCB_OFFSET, NULL) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ (((tcbhead_t *) (__thread_register - TLS_TCB_OFFSET))[-1].dtv) /* Return the thread descriptor for the current thread. */ # define THREAD_SELF \ ((struct pthread *) (__thread_register \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE)) /* Magic for libthread_db to know how to do THREAD_SELF. */ # define DB_THREAD_SELF \ REGISTER (32, 32, PT_THREAD_POINTER * 4, \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) \ REGISTER (64, 64, PT_THREAD_POINTER * 8, \ - TLS_TCB_OFFSET - TLS_PRE_TCB_SIZE) /* Read member of the thread descriptor directly. */ # define THREAD_GETMEM(descr, member) ((void)(descr), (THREAD_SELF)->member) /* Same as THREAD_GETMEM, but the member offset can be non-constant. */ # define THREAD_GETMEM_NC(descr, member, idx) \ ((void)(descr), (THREAD_SELF)->member[idx]) /* Set member of the thread descriptor directly. */ # define THREAD_SETMEM(descr, member, value) \ ((void)(descr), (THREAD_SELF)->member = (value)) /* Same as THREAD_SETMEM, but the member offset can be non-constant. */ # define THREAD_SETMEM_NC(descr, member, idx, value) \ ((void)(descr), (THREAD_SELF)->member[idx] = (value)) /* Set the stack guard field in TCB head. */ # define THREAD_SET_STACK_GUARD(value) \ (((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].stack_guard = (value)) # define THREAD_COPY_STACK_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].stack_guard \ = ((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].stack_guard) /* Set the stack guard field in TCB head. */ # define THREAD_GET_POINTER_GUARD() \ (((tcbhead_t *) ((char *) __thread_register \ - TLS_TCB_OFFSET))[-1].pointer_guard) # define THREAD_SET_POINTER_GUARD(value) \ (THREAD_GET_POINTER_GUARD () = (value)) # define THREAD_COPY_POINTER_GUARD(descr) \ (((tcbhead_t *) ((char *) (descr) \ + TLS_PRE_TCB_SIZE))[-1].pointer_guard \ = THREAD_GET_POINTER_GUARD()) /* l_tls_offset == 0 is perfectly valid on PPC, 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 */