/* Definition for thread-local data handling. linuxthreads/SH version. Copyright (C) 2002, 2003, 2005 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 # include <pt-machine.h> #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 can support TLS only if the floating-stack support is available. */ #if defined HAVE_TLS_SUPPORT \ && (defined FLOATING_STACKS || !defined IS_IN_libpthread) /* Signal that TLS support is available. */ # define USE_TLS 1 /* Include padding in _pthread_descr_struct so that libc can find p_errno, if libpthread will only include the padding because of the !IS_IN_libpthread check. */ #ifndef FLOATING_STACKS # define INCLUDE_TLS_PADDING 1 #endif # ifndef __ASSEMBLER__ 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) /* This is the size we need before TCB. */ # define TLS_PRE_TCB_SIZE sizeof (struct _pthread_descr_struct) /* Alignment requirements for the TCB. */ # define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) /* The TLS blocks start right after the TCB. */ # define TLS_DTV_AT_TP 1 /* 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; \ __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ __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, secondcall) \ ({ __asm__ __volatile__ ("ldc %0,gbr" : : "r" (tcbp)); 0; }) /* Return the address of the dtv for the current thread. */ # define THREAD_DTV() \ ({ tcbhead_t *__tcbp; \ __asm__ __volatile__ ("stc gbr,%0" : "=r" (__tcbp)); \ __tcbp->dtv;}) /* Return the thread descriptor for the current thread. */ # undef THREAD_SELF # define THREAD_SELF \ ({ struct _pthread_descr_struct *__self; \ __asm__ ("stc gbr,%0" : "=r" (__self)); \ __self - 1;}) # undef INIT_THREAD_SELF # define INIT_THREAD_SELF(descr, nr) \ ({ struct _pthread_descr_struct *__self = (void *) descr; \ __asm__ __volatile__ ("ldc %0,gbr" : : "r" (__self + 1)); \ 0; }) # define TLS_MULTIPLE_THREADS_IN_TCB 1 /* Get the thread descriptor definition. This must be after the the definition of THREAD_SELF for TLS. */ # include <linuxthreads/descr.h> # endif /* __ASSEMBLER__ */ #else # ifndef __ASSEMBLER__ typedef struct { void *tcb; dtv_t *dtv; void *self; int multiple_threads; } tcbhead_t; /* Get the thread descriptor definition. */ # include <linuxthreads/descr.h> # define NONTLS_INIT_TP \ do { \ static const tcbhead_t nontls_init_tp = { .multiple_threads = 0 }; \ __asm__ __volatile__ ("ldc %0,gbr" : : "r" (&nontls_init_tp)); \ } while (0) # endif /* __ASSEMBLER__ */ #endif /* HAVE_TLS_SUPPORT && (FLOATING_STACKS || !IS_IN_libpthread) */ #endif /* tls.h */