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authorUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
committerUlrich Drepper <drepper@redhat.com>2004-12-22 20:10:10 +0000
commita334319f6530564d22e775935d9c91663623a1b4 (patch)
treeb5877475619e4c938e98757d518bb1e9cbead751 /csu/libc-tls.c
parent0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (diff)
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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
Diffstat (limited to 'csu/libc-tls.c')
-rw-r--r--csu/libc-tls.c263
1 files changed, 0 insertions, 263 deletions
diff --git a/csu/libc-tls.c b/csu/libc-tls.c
deleted file mode 100644
index 3544e39..0000000
--- a/csu/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