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Diffstat (limited to 'nptl/sysdeps/s390/tls.h')
| -rw-r--r-- | nptl/sysdeps/s390/tls.h | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/nptl/sysdeps/s390/tls.h b/nptl/sysdeps/s390/tls.h new file mode 100644 index 0000000000..fd43564762 --- /dev/null +++ b/nptl/sysdeps/s390/tls.h @@ -0,0 +1,149 @@ +/* Definition for thread-local data handling. nptl/s390 version. + Copyright (C) 2003 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 + +#include <dl-sysdep.h> +#ifndef __ASSEMBLER__ +# include <stddef.h> +# include <stdint.h> +# include <stdlib.h> +# include <list.h> + + +/* Type for the dtv. */ +typedef union dtv +{ + size_t counter; + void *pointer; +} dtv_t; + + +typedef struct +{ + void *tcb; /* Pointer to the TCB. Not necessary the + thread descriptor used by libpthread. */ + dtv_t *dtv; + void *self; /* Pointer to the thread descriptor. */ + int multiple_threads; +#ifdef NEED_DL_SYSINFO + uintptr_t sysinfo; +#endif + list_t list; +} tcbhead_t; + +#else /* __ASSEMBLER__ */ +# include <tcb-offsets.h> +#endif + + +/* 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 + +/* Alignment requirement for the stack. For IA-32 this is governed by + the SSE memory functions. */ +#define STACK_ALIGN 16 + +#ifndef __ASSEMBLER__ +/* Get system call information. */ +# include <sysdep.h> + +/* Get the thread descriptor definition. */ +# include <nptl/descr.h> + +/* 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 (struct pthread) + +/* Alignment requirements for the TCB. */ +# define TLS_TCB_ALIGN __alignof__ (struct pthread) + +/* The TCB can have any size and the memory following the address the + thread pointer points to is unspecified. Allocate the TCB there. */ +# define TLS_TCB_AT_TP 1 + + +/* Install the dtv pointer. The pointer passed is to the element with + index -1 which contain the length. */ +# define INSTALL_DTV(descr, dtvp) \ + ((tcbhead_t *) (descr))->dtv = (dtvp) + 1 + +/* Install new dtv for current thread. */ +# define INSTALL_NEW_DTV(dtv) \ + (((tcbhead_t *) __builtin_thread_pointer ())->dtv = (dtv)) + +/* Return dtv of given thread descriptor. */ +# define GET_DTV(descr) \ + (((tcbhead_t *) (descr))->dtv) + +#if defined NEED_DL_SYSINFO && defined SHARED +# define INIT_SYSINFO \ + _head->sysinfo = GL(dl_sysinfo) +#else +# define INIT_SYSINFO +#endif + +/* 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(thrdescr, secondcall) \ + ({ void *_thrdescr = (thrdescr); \ + tcbhead_t *_head = _thrdescr; \ + \ + _head->tcb = _thrdescr; \ + /* For now the thread descriptor is at the same address. */ \ + _head->self = _thrdescr; \ + /* New syscall handling support. */ \ + INIT_SYSINFO; \ + \ + __builtin_set_thread_pointer (_thrdescr); \ + NULL; \ + }) + +/* Return the address of the dtv for the current thread. */ +# define THREAD_DTV() \ + (((tcbhead_t *) __builtin_thread_pointer ())->dtv) + +/* Return the thread descriptor for the current thread. */ +# define THREAD_SELF ((struct pthread *) __builtin_thread_pointer ()) + +/* Access to data in the thread descriptor is easy. */ +#define THREAD_GETMEM(descr, member) \ + THREAD_SELF->member +#define THREAD_GETMEM_NC(descr, member, idx) \ + THREAD_SELF->member[idx] +#define THREAD_SETMEM(descr, member, value) \ + THREAD_SELF->member = (value) +#define THREAD_SETMEM_NC(descr, member, idx, value) \ + THREAD_SELF->member[idx] = (value) + +#endif /* __ASSEMBLER__ */ + +#endif /* tls.h */ |