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Diffstat (limited to 'sysdeps/generic/libc-tls.c')
| -rw-r--r-- | sysdeps/generic/libc-tls.c | 263 |
1 files changed, 0 insertions, 263 deletions
diff --git a/sysdeps/generic/libc-tls.c b/sysdeps/generic/libc-tls.c deleted file mode 100644 index 3544e39..0000000 --- a/sysdeps/generic/libc-tls.c +++ /dev/null @@ -1,263 +0,0 @@ -/* Initialization code for TLS in statically linked application. - Copyright (C) 2002, 2003, 2004, 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, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <errno.h> -#include <ldsodefs.h> -#include <tls.h> -#include <unistd.h> -#include <stdio.h> -#include <sys/param.h> - - -#ifdef SHARED - #error makefile bug, this file is for static only -#endif - -#ifdef USE_TLS -extern ElfW(Phdr) *_dl_phdr; -extern size_t _dl_phnum; - - -static dtv_t static_dtv[2 + TLS_SLOTINFO_SURPLUS]; - - -static struct -{ - struct dtv_slotinfo_list si; - /* The dtv_slotinfo_list data structure does not include the actual - information since it is defined as an array of size zero. We define - here the necessary entries. Note that it is not important whether - there is padding or not since we will always access the information - through the 'si' element. */ - struct dtv_slotinfo info[2 + TLS_SLOTINFO_SURPLUS]; -} static_slotinfo; - -/* Fake link map for the application. */ -static struct link_map static_map; - - -/* Highest dtv index currently needed. */ -size_t _dl_tls_max_dtv_idx; -/* Flag signalling whether there are gaps in the module ID allocation. */ -bool _dl_tls_dtv_gaps; -/* Information about the dtv slots. */ -struct dtv_slotinfo_list *_dl_tls_dtv_slotinfo_list; -/* Number of modules in the static TLS block. */ -size_t _dl_tls_static_nelem; -/* Size of the static TLS block. Giving this initialized value - preallocates some surplus bytes in the static TLS area. */ -size_t _dl_tls_static_size = 2048; -/* Size actually allocated in the static TLS block. */ -size_t _dl_tls_static_used; -/* Alignment requirement of the static TLS block. */ -size_t _dl_tls_static_align; - -/* Generation counter for the dtv. */ -size_t _dl_tls_generation; - - -/* Additional definitions needed by TLS initialization. */ -#ifdef TLS_INIT_HELPER -TLS_INIT_HELPER -#endif - -static inline void -init_slotinfo (void) -{ - /* Create the slotinfo list. */ - static_slotinfo.si.len = (((char *) (&static_slotinfo + 1) - - (char *) &static_slotinfo.si.slotinfo[0]) - / sizeof static_slotinfo.si.slotinfo[0]); - // static_slotinfo.si.next = NULL; already zero - - /* The slotinfo list. Will be extended by the code doing dynamic - linking. */ - GL(dl_tls_max_dtv_idx) = 1; - GL(dl_tls_dtv_slotinfo_list) = &static_slotinfo.si; -} - -static inline void -init_static_tls (size_t memsz, size_t align) -{ - /* That is the size of the TLS memory for this object. The initialized - value of _dl_tls_static_size is provided by dl-open.c to request some - surplus that permits dynamic loading of modules with IE-model TLS. */ - GL(dl_tls_static_size) = roundup (memsz + GL(dl_tls_static_size), - TLS_TCB_ALIGN); - GL(dl_tls_static_used) = memsz; - /* The alignment requirement for the static TLS block. */ - GL(dl_tls_static_align) = align; - /* Number of elements in the static TLS block. */ - GL(dl_tls_static_nelem) = GL(dl_tls_max_dtv_idx); -} - -void -__libc_setup_tls (size_t tcbsize, size_t tcbalign) -{ - void *tlsblock; - size_t memsz = 0; - size_t filesz = 0; - void *initimage = NULL; - size_t align = 0; - size_t max_align = tcbalign; - size_t tcb_offset; - ElfW(Phdr) *phdr; - - /* Look through the TLS segment if there is any. */ - if (_dl_phdr != NULL) - for (phdr = _dl_phdr; phdr < &_dl_phdr[_dl_phnum]; ++phdr) - if (phdr->p_type == PT_TLS) - { - /* Remember the values we need. */ - memsz = phdr->p_memsz; - filesz = phdr->p_filesz; - initimage = (void *) phdr->p_vaddr; - align = phdr->p_align; - if (phdr->p_align > max_align) - max_align = phdr->p_align; - break; - } - - /* We have to set up the TCB block which also (possibly) contains - 'errno'. Therefore we avoid 'malloc' which might touch 'errno'. - Instead we use 'sbrk' which would only uses 'errno' if it fails. - In this case we are right away out of memory and the user gets - what she/he deserves. - - The initialized value of _dl_tls_static_size is provided by dl-open.c - to request some surplus that permits dynamic loading of modules with - IE-model TLS. */ -# if TLS_TCB_AT_TP - tcb_offset = roundup (memsz + GL(dl_tls_static_size), tcbalign); - tlsblock = __sbrk (tcb_offset + tcbsize + max_align); -# elif TLS_DTV_AT_TP - tcb_offset = roundup (tcbsize, align ?: 1); - tlsblock = __sbrk (tcb_offset + memsz + max_align - + TLS_PRE_TCB_SIZE + GL(dl_tls_static_size)); - tlsblock += TLS_PRE_TCB_SIZE; -# else - /* In case a model with a different layout for the TCB and DTV - is defined add another #elif here and in the following #ifs. */ -# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" -# endif - - /* Align the TLS block. */ - tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1) - & ~(max_align - 1)); - - /* Initialize the dtv. [0] is the length, [1] the generation counter. */ - static_dtv[0].counter = (sizeof (static_dtv) / sizeof (static_dtv[0])) - 2; - // static_dtv[1].counter = 0; would be needed if not already done - - /* Initialize the TLS block. */ -# if TLS_TCB_AT_TP - static_dtv[2].pointer.val = ((char *) tlsblock + tcb_offset - - roundup (memsz, align ?: 1)); - static_map.l_tls_offset = roundup (memsz, align ?: 1); -# elif TLS_DTV_AT_TP - static_dtv[2].pointer.val = (char *) tlsblock + tcb_offset; - static_map.l_tls_offset = tcb_offset; -# else -# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" -# endif - static_dtv[2].pointer.is_static = true; - /* sbrk gives us zero'd memory, so we don't need to clear the remainder. */ - memcpy (static_dtv[2].pointer.val, initimage, filesz); - - /* Install the pointer to the dtv. */ - - /* Initialize the thread pointer. */ -# if TLS_TCB_AT_TP - INSTALL_DTV ((char *) tlsblock + tcb_offset, static_dtv); - - const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset, 0); -# elif TLS_DTV_AT_TP - INSTALL_DTV (tlsblock, static_dtv); - const char *lossage = TLS_INIT_TP (tlsblock, 0); -# else -# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" -# endif - if (__builtin_expect (lossage != NULL, 0)) - __libc_fatal (lossage); - - /* We have to create a fake link map which normally would be created - by the dynamic linker. It just has to have enough information to - make the TLS routines happy. */ - static_map.l_tls_align = align; - static_map.l_tls_blocksize = memsz; - static_map.l_tls_initimage = initimage; - static_map.l_tls_initimage_size = filesz; - static_map.l_type = lt_executable; - static_map.l_tls_modid = 1; - - init_slotinfo (); - // static_slotinfo.si.slotinfo[1].gen = 0; already zero - static_slotinfo.si.slotinfo[1].map = &static_map; - - memsz = roundup (memsz, align ?: 1); - -# if TLS_TCB_AT_TP - memsz += tcbsize; -# elif TLS_DTV_AT_TP - memsz += tcb_offset; -# endif - - init_static_tls (memsz, MAX (TLS_TCB_ALIGN, max_align)); -} - -/* This is called only when the data structure setup was skipped at startup, - when there was no need for it then. Now we have dynamically loaded - something needing TLS, or libpthread needs it. */ -int -internal_function -_dl_tls_setup (void) -{ - init_slotinfo (); - init_static_tls ( -# if TLS_TCB_AT_TP - TLS_TCB_SIZE, -# else - 0, -# endif - TLS_TCB_ALIGN); - return 0; -} - - -/* This is the minimal initialization function used when libpthread is - not used. */ -void -__attribute__ ((weak)) -__pthread_initialize_minimal (void) -{ - __libc_setup_tls (TLS_INIT_TCB_SIZE, TLS_INIT_TCB_ALIGN); -} - -#elif defined NONTLS_INIT_TP - -/* This is the minimal initialization function used when libpthread is - not used. */ -void -__attribute__ ((weak)) -__pthread_initialize_minimal (void) -{ - NONTLS_INIT_TP; -} - -#endif |