Update.
2002-02-06 Ulrich Drepper <drepper@redhat.com> * Versions.def [ld]: Add GLIBC_2.3. * elf/Versions [ld]: Add __tls_get_addr to GLIBC_2.3. * elf/Makefile (dl-routines): Add dl-tls. (distribute): Add dl-tls.h. * sysdeps/generic/ldsodefs.h (struct rtld_global): Remove _dl_tls_module_cnt, add _dl_tls_max_dtv_idx and _dl_tls_dtv_gaps. Add prototypes for _dl_next_tls_modid and _dl_determine_tlsoffset. * elf/dl-load.c (_dl_map_object_from_fd): Store alignment requirement along with the other info in the link map. Change queueing of init images for double linked list. Use _dl_next_tls_modid to compute l_tls_modid. * elf/rtld.c (_dl_start_final): Store alignment requirement along with the other info in rtld map and executable map. (dl_main): Add ld.so to the init image list if necessary. Compute final module ID with _dl_next_tls_modid. * include/link.h (struct link_map): Add l_tls_previmage and l_tls_align. * eld/dl-support.c: Define _dl_tls_max_dtv_idx and _dl_tls_dtv_gaps. * sysdeps/i386/elf/Versions: New file. * sysdeps/generic/dl-tls.c: New file. * sysdeps/generic/dl-tls.h: New file. * sysdeps/i386/dl-tls.h: New file. attribute((packed)) to counter stupid people misusing gcc options.
This commit is contained in:
Ulrich Drepper
parent
a53a253b90
commit
3fb558781f
27
ChangeLog
27
ChangeLog
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@ -1,3 +1,28 @@
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2002-02-06 Ulrich Drepper <drepper@redhat.com>
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* Versions.def [ld]: Add GLIBC_2.3.
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* elf/Versions [ld]: Add __tls_get_addr to GLIBC_2.3.
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* elf/Makefile (dl-routines): Add dl-tls.
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(distribute): Add dl-tls.h.
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* sysdeps/generic/ldsodefs.h (struct rtld_global): Remove
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_dl_tls_module_cnt, add _dl_tls_max_dtv_idx and _dl_tls_dtv_gaps.
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Add prototypes for _dl_next_tls_modid and _dl_determine_tlsoffset.
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* elf/dl-load.c (_dl_map_object_from_fd): Store alignment requirement
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along with the other info in the link map. Change queueing of init
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images for double linked list. Use _dl_next_tls_modid to compute
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l_tls_modid.
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* elf/rtld.c (_dl_start_final): Store alignment requirement
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along with the other info in rtld map and executable map.
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(dl_main): Add ld.so to the init image list if necessary. Compute
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final module ID with _dl_next_tls_modid.
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* include/link.h (struct link_map): Add l_tls_previmage and
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l_tls_align.
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* eld/dl-support.c: Define _dl_tls_max_dtv_idx and _dl_tls_dtv_gaps.
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* sysdeps/i386/elf/Versions: New file.
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* sysdeps/generic/dl-tls.c: New file.
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* sysdeps/generic/dl-tls.h: New file.
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* sysdeps/i386/dl-tls.h: New file.
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2002-02-06 Roland McGrath <roland@frob.com>
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* sysdeps/unix/sysv/linux/netinet/ip.h: Moved to ...
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@ -19,7 +44,7 @@
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2002-02-06 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/unix/sysv/linux/bits/stat.h (struct stat): Add
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attribute((packed)) to counter stupid people misuing gcc options.
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attribute((packed)) to counter stupid people misusing gcc options.
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(struct stat64): Likewise.
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2002-02-05 Ulrich Drepper <drepper@redhat.com>
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@ -143,8 +143,10 @@ __libc_lock_define_initialized_recursive (, _dl_load_lock)
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initialize new TLS blocks. */
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struct link_map *_dl_initimage_list;
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/* Count the number of modules which define TLS data. */
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size_t _dl_tls_module_cnt;
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/* Highest dtv index currently needed. */
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size_t _dl_tls_max_dtv_idx;
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/* Flag signalling whether there are gaps in the module ID allocation. */
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bool _dl_tls_dtv_gaps;
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#endif
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72
elf/rtld.c
72
elf/rtld.c
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@ -259,9 +259,11 @@ _dl_start_final (void *arg, struct link_map *bootstrap_map_p,
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if (phdr[cnt].p_type == PT_TLS)
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{
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void *tlsblock;
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size_t align = MAX (TLS_INIT_TCB_ALIGN, phdr[cnt].p_align);
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size_t max_align = MAX (TLS_INIT_TCB_ALIGN, phdr[cnt].p_align);
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GL(dl_rtld_map).l_tls_blocksize = phdr[cnt].p_memsz;
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GL(dl_rtld_map).l_tls_align = phdr[cnt].p_align;
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assert (GL(dl_rtld_map).l_tls_blocksize != 0);
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GL(dl_rtld_map).l_tls_initimage_size = phdr[cnt].p_filesz;
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GL(dl_rtld_map).l_tls_initimage = (void *) (GL(dl_rtld_map).l_map_start
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+ phdr[cnt].p_offset);
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@ -274,19 +276,20 @@ _dl_start_final (void *arg, struct link_map *bootstrap_map_p,
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tlsblock = alloca (roundup (GL(dl_rtld_map).l_tls_blocksize,
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TLS_INIT_TCB_ALIGN)
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+ TLS_INIT_TCB_SIZE
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+ align);
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+ max_align);
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# elif TLS_DTV_AT_TP
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tlsblock = alloca (roundup (TLS_INIT_TCB_SIZE, phdr[cnt].p_align)
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tlsblock = alloca (roundup (TLS_INIT_TCB_SIZE,
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GL(dl_rtld_map).l_tls_align)
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+ GL(dl_rtld_map).l_tls_blocksize
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+ align);
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+ max_align);
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# else
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/* In case a model with a different layout for the TCB and DTV
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is defined add another #elif here and in the following #ifs. */
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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# endif
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/* Align the TLS block. */
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tlsblock = (void *) (((uintptr_t) tlsblock + align - 1)
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& ~(align - 1));
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tlsblock = (void *) (((uintptr_t) tlsblock + max_align - 1)
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& ~(max_align - 1));
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/* Initialize the dtv. */
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initdtv[0].counter = 1;
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@ -296,7 +299,7 @@ _dl_start_final (void *arg, struct link_map *bootstrap_map_p,
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initdtv[1].pointer = tlsblock;
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# elif TLS_DTV_AT_TP
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GL(dl_rtld_map).l_tls_offset = roundup (TLS_INIT_TCB_SIZE,
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phdr[cnt].p_align);
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GL(dl_rtld_map).l_tls_align);
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initdtv[1].pointer = (char *) tlsblock + GL(dl_rtld_map).l_tls_offset);
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# else
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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@ -716,16 +719,18 @@ of this helper program; chances are you did not intend to run this program.\n\
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_dl_start_final. But the result is repeatable so do not
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check for this special but unimportant case. */
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GL(dl_loaded)->l_tls_blocksize = ph->p_memsz;
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GL(dl_loaded)->l_tls_align = ph->p_align;
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GL(dl_loaded)->l_tls_initimage_size = ph->p_filesz;
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GL(dl_loaded)->l_tls_initimage = (void *) (GL(dl_loaded)->l_addr
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+ ph->p_offset);
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/* This is the first element of the initialization image list.
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It is created as a circular list so that we can easily
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append to it. */
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GL(dl_initimage_list) = GL(dl_loaded)->l_tls_nextimage = GL(dl_loaded);
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We create the list as circular since we have to append at
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the end. */
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GL(dl_initimage_list) = GL(dl_loaded)->l_tls_nextimage
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= GL(dl_loaded)->l_tls_previmage = GL(dl_loaded);
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/* This image get the ID one. */
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GL(dl_tls_module_cnt) = GL(dl_loaded)->l_tls_modid = 1;
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/* This image gets the ID one. */
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GL(dl_tls_max_dtv_idx) = GL(dl_loaded)->l_tls_modid = 1;
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break;
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#endif
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}
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@ -736,7 +741,7 @@ of this helper program; chances are you did not intend to run this program.\n\
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/* We were invoked directly, so the program might not have a
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PT_INTERP. */
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_dl_rtld_libname.name = GL(dl_rtld_map).l_name;
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/* _dl_rtld_libname.next = NULL; Alread zero. */
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/* _dl_rtld_libname.next = NULL; Already zero. */
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GL(dl_rtld_map).l_libname = &_dl_rtld_libname;
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}
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else
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@ -973,7 +978,7 @@ of this helper program; chances are you did not intend to run this program.\n\
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assert (GL(dl_rtld_map).l_prev->l_next == GL(dl_rtld_map).l_next);
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GL(dl_rtld_map).l_prev->l_next = &GL(dl_rtld_map);
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if (GL(dl_rtld_map).l_next)
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if (GL(dl_rtld_map).l_next != NULL)
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{
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assert (GL(dl_rtld_map).l_next->l_prev == GL(dl_rtld_map).l_prev);
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GL(dl_rtld_map).l_next->l_prev = &GL(dl_rtld_map);
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@ -1328,6 +1333,41 @@ of this helper program; chances are you did not intend to run this program.\n\
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we need it in the memory handling later. */
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GL(dl_initial_searchlist) = *GL(dl_main_searchlist);
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#ifdef USE_TLS
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/* Now it is time to determine the layout of the static TLS block
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and allocate it for the initial thread. Note that we always
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allocate the static block, we never defer it even if no
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DF_STATIC_TLS bit is set. The reason is that we know glibc will
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use the static model. First add the dynamic linker to the list
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if it also uses TLS. */
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if (GL(dl_rtld_map).l_tls_blocksize != 0)
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{
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/* At to the list. */
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if (GL(dl_initimage_list) == NULL)
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GL(dl_initimage_list) = GL(dl_rtld_map).l_tls_nextimage
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= GL(dl_rtld_map).l_tls_previmage = &GL(dl_rtld_map);
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else
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{
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GL(dl_rtld_map).l_tls_nextimage
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= GL(dl_initimage_list)->l_tls_nextimage;
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GL(dl_rtld_map).l_tls_nextimage->l_tls_previmage
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= &GL(dl_rtld_map);
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GL(dl_rtld_map).l_tls_previmage = GL(dl_initimage_list);
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GL(dl_rtld_map).l_tls_previmage->l_tls_nextimage
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= &GL(dl_rtld_map);
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GL(dl_initimage_list) = &GL(dl_rtld_map);
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}
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/* Assign a module ID. */
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GL(dl_rtld_map).l_tls_modid = _dl_next_tls_modid ();
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}
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if (GL(dl_initimage_list) != NULL)
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/* This means we actually have some modules which use TLS.
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Computer the TLS offsets for the various blocks. */
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_dl_determine_tlsoffset (GL(dl_initimage_list)->l_tls_nextimage);
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#endif
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{
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/* Initialize _r_debug. */
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struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr);
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@ -1344,14 +1384,14 @@ of this helper program; chances are you did not intend to run this program.\n\
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#else
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if (l->l_info[DT_DEBUG])
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if (l->l_info[DT_DEBUG] != NULL)
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/* There is a DT_DEBUG entry in the dynamic section. Fill it in
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with the run-time address of the r_debug structure */
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l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
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/* Fill in the pointer in the dynamic linker's own dynamic section, in
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case you run gdb on the dynamic linker directly. */
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if (GL(dl_rtld_map).l_info[DT_DEBUG])
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if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL)
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GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
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#endif
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@ -256,20 +256,26 @@ struct link_map
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const ElfW(Sym) *ret;
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} l_lookup_cache;
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#ifdef USE_TLS
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/* Thread-local storage related info. */
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/* Next module in list of initialization images. */
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struct link_map *l_tls_nextimage;
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/* Previous module in list of initialization images. */
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struct link_map *l_tls_previmage;
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/* Start of the initialization image. */
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void *l_tls_initimage;
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/* Size of the initialization image. */
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size_t l_tls_initimage_size;
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/* Size of the TLS block. */
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size_t l_tls_blocksize;
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/* Alignment rquirement of the TLS block. */
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size_t l_tls_align;
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/* For objects present at startup time: offset in the static TLS block. */
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ptrdiff_t l_tls_offset;
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/* Index of the module in the dtv array. */
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size_t l_tls_modid;
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#endif
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};
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struct dl_phdr_info
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@ -1,3 +1,7 @@
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2002-02-06 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/i386/tls.h: Define THREAD_DTV.
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2002-02-04 Ulrich Drepper <drepper@redhat.com>
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* internals.h: Move thread descriptor definition...
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@ -90,6 +90,13 @@ typedef struct
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asm ("hlt"); \
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} while (0)
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/* Return the address of the dtv for the current thread. */
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# define THREAD_DTV() \
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({ struct _pthread_descr_struct *__descr; \
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THREAD_GETMEM (__descr, p_header.data.dtvp); })
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#endif
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#endif /* tls.h */
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155
sysdeps/generic/dl-tls.c
Normal file
155
sysdeps/generic/dl-tls.c
Normal file
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@ -0,0 +1,155 @@
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/* Thread-local storage handling in the ELF dynamic linker. Generic version.
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Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
|
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License along with the GNU C Library; if not, write to the Free
|
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <dl-tls.h>
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#include <ldsodefs.h>
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/* We don't need any of this if TLS is not supported. */
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#ifdef USE_TLS
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/* Value used for dtv entries for which the allocation is delayed. */
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# define TLS_DTV_UNALLOCATE ((void *) -1l)
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size_t
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internal_function
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_dl_next_tls_modid (void)
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{
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size_t result;
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if (__builtin_expect (GL(dl_tls_dtv_gaps), false))
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{
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/* XXX If this method proves too costly we can optimize
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it to use a constant time method. But I don't think
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it's a problem. */
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struct link_map *runp = GL(dl_initimage_list);
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bool used[GL(dl_tls_max_dtv_idx)];
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assert (runp != NULL);
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do
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{
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assert (runp->l_tls_modid > 0
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&& runp->l_tls_modid <= GL(dl_tls_max_dtv_idx));
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used[runp->l_tls_modid - 1] = true;
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}
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while ((runp = runp->l_tls_nextimage) != GL(dl_initimage_list));
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result = 0;
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do
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/* The information about the gaps is pessimistic. It might be
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there are actually none. */
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if (result >= GL(dl_tls_max_dtv_idx))
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{
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/* Now we know there is actually no gap. Bump the maximum
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ID number and remember that there are no gaps. */
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result = ++GL(dl_tls_max_dtv_idx);
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GL(dl_tls_dtv_gaps) = false;
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break;
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}
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while (used[result++]);
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}
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else
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/* No gaps, allocate a new entry. */
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result = ++GL(dl_tls_max_dtv_idx);
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return result;
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}
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void
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internal_function
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_dl_determine_tlsoffset (struct link_map *firstp)
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{
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struct link_map *runp = firstp;
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size_t max_align = 0;
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size_t offset;
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# if TLS_TCB_AT_TP
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/* We simply start with zero. */
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offset = 0;
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do
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{
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max_align = MAX (max_align, runp->l_tls_align);
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/* Compute the offset of the next TLS block. */
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offset = roundup (offset + runp->l_tls_blocksize, runp->l_tls_align);
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/* XXX For some architectures we perhaps should store the
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negative offset. */
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runp->l_tls_offset = offset;
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}
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while ((runp = runp->l_tls_nextimage) != firstp);
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# elif TLS_DTV_AT_TP
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struct link_map *lastp;
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/* The first block starts right after the TCB. */
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offset = TLS_TCB_SIZE;
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max_align = runp->l_tls_align;
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runp->l_tls_offset = offset;
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lastp = runp;
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while ((runp = runp->l_tls_nextimage) != firstp)
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{
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max_align = MAX (max_align, runp->l_tls_align);
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/* Compute the offset of the next TLS block. */
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offset = roundup (offset + lastp->l_tls_blocksize, runp->l_tls_align);
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runp->l_tls_offset = offset;
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}
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# else
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# error "Either TLS_TCB_AT_TP or TLS_DTV_AT_TP must be defined"
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# endif
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}
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||||
/* The __tls_get_addr function has two basic forms which differ in the
|
||||
arguments. The IA-64 form takes two parameters, the module ID and
|
||||
offset. The form used, among others, on IA-32 takes a reference to
|
||||
a special structure which contain the same information. The second
|
||||
form seems to be more often used (in the moment) so we default to
|
||||
it. Users of the IA-64 form have to provide adequate definitions
|
||||
of the following macros. */
|
||||
# ifndef GET_ADDR_ARGS
|
||||
# define GET_ADDR_ARGS struct tls_index *ti
|
||||
# endif
|
||||
# ifndef GET_ADDR_MODULE
|
||||
# define GET_ADDR_MODULE ti->ti_module
|
||||
# endif
|
||||
# ifndef GET_ADDR_OFFSET
|
||||
# define GET_ADDR_OFFSET ti->ti_offset
|
||||
# endif
|
||||
|
||||
|
||||
void *
|
||||
__tls_get_addr (GET_ADDR_ARGS)
|
||||
{
|
||||
dtv_t *dtv = THREAD_DTV ();
|
||||
|
||||
if (dtv[GET_ADDR_MODULE].pointer == TLS_DTV_UNALLOCATE)
|
||||
/* XXX */;
|
||||
|
||||
return (char *) dtv[GET_ADDR_MODULE].pointer + GET_ADDR_OFFSET;
|
||||
}
|
||||
|
||||
#endif /* use TLS */
|
||||
2
sysdeps/generic/dl-tls.h
Normal file
2
sysdeps/generic/dl-tls.h
Normal file
|
|
@ -0,0 +1,2 @@
|
|||
/* There has to be an architecture specific version of this file. */
|
||||
#error "architecture-specific version of <dl-tls.h> missing"
|
||||
|
|
@ -22,6 +22,7 @@
|
|||
|
||||
#include <features.h>
|
||||
|
||||
#include <stdbool.h>
|
||||
#define __need_size_t
|
||||
#define __need_NULL
|
||||
#include <stddef.h>
|
||||
|
|
@ -230,7 +231,7 @@ struct rtld_global
|
|||
#define DL_DEBUG_RELOC (1 << 5)
|
||||
#define DL_DEBUG_FILES (1 << 6)
|
||||
#define DL_DEBUG_STATISTICS (1 << 7)
|
||||
/* This one is used only internally. */
|
||||
/* These two are used only internally. */
|
||||
#define DL_DEBUG_HELP (1 << 8)
|
||||
#define DL_DEBUG_PRELINK (1 << 9)
|
||||
|
||||
|
|
@ -293,8 +294,10 @@ struct rtld_global
|
|||
initialize new TLS blocks. */
|
||||
EXTERN struct link_map *_dl_initimage_list;
|
||||
|
||||
/* Count the number of modules which define TLS data. */
|
||||
EXTERN size_t _dl_tls_module_cnt;
|
||||
/* Highest dtv index currently needed. */
|
||||
EXTERN size_t _dl_tls_max_dtv_idx;
|
||||
/* Flag signalling whether there are gaps in the module ID allocation. */
|
||||
EXTERN bool _dl_tls_dtv_gaps;
|
||||
#endif
|
||||
|
||||
/* Name of the shared object to be profiled (if any). */
|
||||
|
|
@ -651,6 +654,14 @@ extern void _dl_sysdep_start_cleanup (void)
|
|||
internal_function;
|
||||
|
||||
|
||||
/* Determine next available module ID. */
|
||||
extern size_t _dl_next_tls_modid (void) internal_function;
|
||||
|
||||
/* Calculate offset of the TLS blocks in the static TLS block. */
|
||||
extern void _dl_determine_tlsoffset (struct link_map *firstp)
|
||||
internal_function;
|
||||
|
||||
|
||||
__END_DECLS
|
||||
|
||||
#endif /* ldsodefs.h */
|
||||
|
|
|
|||
47
sysdeps/i386/dl-tls.h
Normal file
47
sysdeps/i386/dl-tls.h
Normal file
|
|
@ -0,0 +1,47 @@
|
|||
/* Thread-local storage handling in the ELF dynamic linker. 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. */
|
||||
|
||||
/* Type used for the representation of TLS information in the GOT. */
|
||||
struct tls_index
|
||||
{
|
||||
unsigned long int ti_module;
|
||||
unsigned long int ti_offset;
|
||||
};
|
||||
|
||||
|
||||
/* This is the prototype for the GNU version. */
|
||||
extern void *___tls_get_addr (struct tls_index *ti)
|
||||
__attribute__ ((__regparm__ (1)));
|
||||
|
||||
/* The special thing about the x86 TLS ABI is that we have two
|
||||
variants of the __tls_get_addr function with different calling
|
||||
conventions. The GNU version, which we are mostly concerned here,
|
||||
takes the parameter in a register. The name is changed by adding
|
||||
an additional underscore at the beginning. The Sun version uses
|
||||
the normal calling convention. */
|
||||
void *
|
||||
__tls_get_addr (struct tls_index *ti)
|
||||
{
|
||||
return ___tls_get_addr (ti);
|
||||
}
|
||||
|
||||
|
||||
/* Prepare using the definition of __tls_get_addr in the generic
|
||||
version of this file. */
|
||||
#define __tls_get_addr __attribute__ ((__regparm__ (1))) ___tls_get_addr
|
||||
Loading…
Reference in a new issue