diff options
Diffstat (limited to 'csu/libc-tls.c')
| -rw-r--r-- | csu/libc-tls.c | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/csu/libc-tls.c b/csu/libc-tls.c deleted file mode 100644 index 3c897bf28b..0000000000 --- a/csu/libc-tls.c +++ /dev/null @@ -1,217 +0,0 @@ -/* Initialization code for TLS in statically linked application. - Copyright (C) 2002-2017 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/>. */ - -#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 - -dtv_t _dl_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; - - -/* 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 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 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); -#if TLS_TCB_AT_TP - GL(dl_tls_static_size) += TLS_TCB_SIZE; -#endif - 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 (void) -{ - void *tlsblock; - size_t memsz = 0; - size_t filesz = 0; - void *initimage = NULL; - size_t align = 0; - size_t max_align = TCB_ALIGNMENT; - size_t tcb_offset; - const 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 - /* Align the TCB offset to the maximum alignment, as - _dl_allocate_tls_storage (in elf/dl-tls.c) does using __libc_memalign - and dl_tls_static_align. */ - tcb_offset = roundup (memsz + GL(dl_tls_static_size), max_align); - tlsblock = __sbrk (tcb_offset + TLS_INIT_TCB_SIZE + max_align); -#elif TLS_DTV_AT_TP - tcb_offset = roundup (TLS_INIT_TCB_SIZE, 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. */ - _dl_static_dtv[0].counter = (sizeof (_dl_static_dtv) / sizeof (_dl_static_dtv[0])) - 2; - // _dl_static_dtv[1].counter = 0; would be needed if not already done - - struct link_map *main_map = GL(dl_ns)[LM_ID_BASE]._ns_loaded; - - /* Initialize the TLS block. */ -#if TLS_TCB_AT_TP - _dl_static_dtv[2].pointer.val = ((char *) tlsblock + tcb_offset - - roundup (memsz, align ?: 1)); - main_map->l_tls_offset = roundup (memsz, align ?: 1); -#elif TLS_DTV_AT_TP - _dl_static_dtv[2].pointer.val = (char *) tlsblock + tcb_offset; - main_map->l_tls_offset = tcb_offset; -#else -# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined" -#endif - _dl_static_dtv[2].pointer.to_free = NULL; - /* sbrk gives us zero'd memory, so we don't need to clear the remainder. */ - memcpy (_dl_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, _dl_static_dtv); - - const char *lossage = TLS_INIT_TP ((char *) tlsblock + tcb_offset); -#elif TLS_DTV_AT_TP - INSTALL_DTV (tlsblock, _dl_static_dtv); - const char *lossage = TLS_INIT_TP (tlsblock); -#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); - - /* Update the executable's link map with enough information to make - the TLS routines happy. */ - main_map->l_tls_align = align; - main_map->l_tls_blocksize = memsz; - main_map->l_tls_initimage = initimage; - main_map->l_tls_initimage_size = filesz; - main_map->l_tls_modid = 1; - - init_slotinfo (); - // static_slotinfo.si.slotinfo[1].gen = 0; already zero - static_slotinfo.si.slotinfo[1].map = main_map; - - memsz = roundup (memsz, align ?: 1); - -#if TLS_DTV_AT_TP - memsz += tcb_offset; -#endif - - init_static_tls (memsz, MAX (TLS_TCB_ALIGN, max_align)); -} |