From 535b764df5ca722066c2db615190e6a70688c6a6 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Tue, 5 Feb 2002 00:57:29 +0000 Subject: Update. * elf/rtld.c (_dl_start_final): Allocate TLS and initialize thread-pointer as soon as possible. * sysdeps/generic/ldsodefs.h: Include . Define first TLS elements in rtld_global. * sysdeps/generic/tls.h: New file. * elf/Makefile (distribute): Add tls.h. * sysdeps/i386/dl-machine.h (elf_machine_rel): Add support for TLS relocations. Not complete yet. * resolv/resolv.h: Allow user to define __need_res_state and only define __res_start structure then. * include/resolv.h: Only declare functions if _RESOLV_H_ is defined. --- linuxthreads/sysdeps/i386/tls.h | 95 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 linuxthreads/sysdeps/i386/tls.h (limited to 'linuxthreads/sysdeps') diff --git a/linuxthreads/sysdeps/i386/tls.h b/linuxthreads/sysdeps/i386/tls.h new file mode 100644 index 0000000000..17f6e0ae45 --- /dev/null +++ b/linuxthreads/sysdeps/i386/tls.h @@ -0,0 +1,95 @@ +/* Definition for thread-local data handling. linuxthreads/i386 version. + Copyright (C) 2002 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 + +/* Type for the dtv. */ +typedef union dtv +{ + size_t counter; + void *pointer; +} dtv_t; + + +typedef struct +{ + void *tcb; + dtv_t *dtv; +} tcbhead_t; + + +/* Get the thread descriptor definition. */ +#include + + +/* We can support TLS only if the floating-stack support is available. */ +#if FLOATING_STACKS && defined HAVE_TLS_SUPPORT + +/* Get system call information. */ +# include + +/* Signal that TLS support is available. */ +# define USE_TLS 1 + +/* 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_descr_struct) + +/* Alignment requirements for the TCB. */ +# define TLS_TCB_ALIGN __alignof__ (struct _pthread_descr_struct) + +/* 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 + +/* 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(descr, dtvp) \ + do { \ + void *_descr = (descr); \ + struct modify_ldt_ldt_s ldt_entry = \ + { 0, (unsigned long int) _descr, 1048576, 1, 0, 0, 1, 0, 1, 0 }; \ + int result; \ + tcbhead_t *head = _descr; \ + \ + head->tcb = _descr; \ + head->dtv = dtvp; \ + \ + asm ("pushl %%ebx\n\t" \ + "movl $1, %%ebx\n\t" \ + "int $0x80\n\t" \ + "popl %%ebx" \ + : "=a" (result) \ + : "0" (__NR_modify_ldt), "d" (sizeof (ldt_entry)), "c" (&ldt_entry));\ + \ + if (__builtin_expect (result, 0) != 0) \ + /* Nothing else we can do. */ \ + asm ("hlt"); \ + } while (0) + +#endif + +#endif /* tls.h */ -- cgit v1.2.3