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https://sourceware.org/git/glibc.git
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Update.
2003-04-07 H.J. Lu <hjl@gnu.org> * sysdeps/generic/dl-fptr.c: Modify to remove the lock. 2003-04-03 H.J. Lu <hjl@gnu.org> * sysdeps/ia64/dl-fptr.c: Moved to ... * sysdeps/generic/dl-fptr.c: Here. * sysdeps/generic/dl-fptr.h: New. * sysdeps/ia64/dl-fptr.h: New. * sysdeps/ia64/dl-symaddr.c: Moved to ... * sysdeps/generic/dl-symaddr.c: here. * sysdeps/ia64/dl-machine.h: Include <dl-fptr.h>. (IA64_BOOT_FPTR_TABLE_LEN): Removed. (ia64_fdesc): Likewise. (ia64_fdesc_table): Likewise. (__ia64_make_fptr): Likewise. (__ia64_init_bootstrap_fdesc_table): Replace __ia64_boot_fptr_table with _dl_boot_fptr_table. (elf_machine_runtime_setup): Replace `struct ia64_fdesc' with `struct fdesc'. (elf_machine_rela): Replace __ia64_make_fptr with _dl_make_fptr.
This commit is contained in:
Ulrich Drepper
parent
0a7fb82685
commit
a92026c98e
26
ChangeLog
26
ChangeLog
@ -1,3 +1,29 @@
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2003-04-07 H.J. Lu <hjl@gnu.org>
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* sysdeps/generic/dl-fptr.c: Modify to remove the lock.
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2003-04-03 H.J. Lu <hjl@gnu.org>
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* sysdeps/ia64/dl-fptr.c: Moved to ...
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* sysdeps/generic/dl-fptr.c: Here.
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* sysdeps/generic/dl-fptr.h: New.
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* sysdeps/ia64/dl-fptr.h: New.
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* sysdeps/ia64/dl-symaddr.c: Moved to ...
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* sysdeps/generic/dl-symaddr.c: here.
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* sysdeps/ia64/dl-machine.h: Include <dl-fptr.h>.
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(IA64_BOOT_FPTR_TABLE_LEN): Removed.
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(ia64_fdesc): Likewise.
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(ia64_fdesc_table): Likewise.
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(__ia64_make_fptr): Likewise.
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(__ia64_init_bootstrap_fdesc_table): Replace __ia64_boot_fptr_table
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with _dl_boot_fptr_table.
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(elf_machine_runtime_setup): Replace `struct ia64_fdesc' with
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`struct fdesc'.
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(elf_machine_rela): Replace __ia64_make_fptr with _dl_make_fptr.
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2003-05-01 Roland McGrath <roland@redhat.com>
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* sysdeps/generic/bp-thunks.h: Protect includes with [!__ASSEMBLER__].
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312
sysdeps/generic/dl-fptr.c
Normal file
312
sysdeps/generic/dl-fptr.c
Normal file
@ -0,0 +1,312 @@
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/* Manage function descriptors. Generic version.
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Copyright (C) 1999,2000,2001,2002,2003 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 <unistd.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/mman.h>
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#include <link.h>
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#include <ldsodefs.h>
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#include <elf/dynamic-link.h>
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#include <dl-fptr.h>
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#include <atomic.h>
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#ifndef ELF_MACHINE_BOOT_FPTR_TABLE_LEN
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/* ELF_MACHINE_BOOT_FPTR_TABLE_LEN should be greater than the number of
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dynamic symbols in ld.so. */
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#define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 256
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#endif
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#ifndef ELF_MACHINE_LOAD_ADDRESS
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# error "ELF_MACHINE_LOAD_ADDRESS is not defined."
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#endif
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#ifndef COMPARE_AND_SWAP
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#define COMPARE_AND_SWAP(ptr,old,new) \
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atomic_compare_and_exchange_bool_acq ((ptr), (old), (new))
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#endif
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ElfW(Addr) _dl_boot_fptr_table [ELF_MACHINE_BOOT_FPTR_TABLE_LEN];
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static struct local
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{
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struct fdesc_table *root;
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struct fdesc *free_list;
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unsigned int npages; /* # of pages to allocate */
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/* the next to members MUST be consecutive! */
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struct fdesc_table boot_table;
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struct fdesc boot_fdescs[1024];
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}
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local =
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{
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root: &local.boot_table,
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npages: 2,
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boot_table:
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{
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len: sizeof (local.boot_fdescs) / sizeof (local.boot_fdescs[0]),
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first_unused: 0
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}
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};
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/* Create a new fdesc table and return a pointer to the first fdesc
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entry. The fdesc lock must have been acquired already. */
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static struct fdesc_table *
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new_fdesc_table (struct local *l, size_t *size)
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{
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size_t old_npages = l->npages;
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size_t new_npages = old_npages + old_npages;
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struct fdesc_table *new_table;
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/* If someone has just created a new table, we return NULL to tell
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the caller to use the new table. */
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if (! COMPARE_AND_SWAP (&l->npages, old_npages, new_npages))
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return (struct fdesc_table *) NULL;
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*size = old_npages * GL(dl_pagesize);
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new_table = __mmap (0, *size,
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PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
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-1, 0);
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if (new_table == MAP_FAILED)
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_dl_signal_error (errno, NULL, NULL,
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"cannot map pages for fdesc table");
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new_table->len
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= (*size - sizeof (*new_table)) / sizeof (struct fdesc);
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new_table->first_unused = 1;
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return new_table;
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}
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static ElfW(Addr)
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make_fdesc (ElfW(Addr) ip, ElfW(Addr) gp)
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{
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struct fdesc *fdesc = NULL;
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struct fdesc_table *root;
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unsigned int old;
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struct local *l;
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ELF_MACHINE_LOAD_ADDRESS (l, local);
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retry:
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root = l->root;
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while (1)
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{
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old = root->first_unused;
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if (old >= root->len)
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break;
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else if (COMPARE_AND_SWAP (&root->first_unused, old, old + 1))
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{
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fdesc = &root->fdesc[old];
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goto install;
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}
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}
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if (l->free_list)
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{
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/* Get it from free-list */
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do
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{
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fdesc = l->free_list;
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if (fdesc == NULL)
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goto retry;
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}
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while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->free_list,
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(ElfW(Addr)) fdesc, fdesc->ip));
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}
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else
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{
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/* Create a new fdesc table */
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size_t size;
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struct fdesc_table *new_table = new_fdesc_table (l, &size);
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if (new_table == NULL)
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goto retry;
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new_table->next = root;
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if (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->root,
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(ElfW(Addr)) root,
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(ElfW(Addr)) new_table))
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/* Someone has just installed a new table. Return NULL to
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tell the caller to use the new table. */
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__munmap (new_table, size);
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goto retry;
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}
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install:
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fdesc->ip = ip;
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fdesc->gp = gp;
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return (ElfW(Addr)) fdesc;
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}
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static inline ElfW(Addr) *
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make_fptr_table (struct link_map *map)
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{
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const ElfW(Sym) *symtab
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= (const void *) D_PTR (map, l_info[DT_SYMTAB]);
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const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
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ElfW(Addr) *fptr_table;
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size_t size;
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size_t len;
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/* XXX Apparently the only way to find out the size of the dynamic
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symbol section is to assume that the string table follows right
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afterwards... */
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len = ((strtab - (char *) symtab)
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/ map->l_info[DT_SYMENT]->d_un.d_val);
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size = ((len * sizeof (fptr_table[0]) + GL(dl_pagesize) - 1)
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& -GL(dl_pagesize));
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/* XXX We don't support here in the moment systems without MAP_ANON.
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There probably are none for IA-64. In case this is proven wrong
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we will have to open /dev/null here and use the file descriptor
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instead of the hard-coded -1. */
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fptr_table = __mmap (NULL, size,
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PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
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-1, 0);
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if (fptr_table == MAP_FAILED)
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_dl_signal_error (errno, NULL, NULL,
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"cannot map pages for fptr table");
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if (COMPARE_AND_SWAP ((ElfW(Addr) *) &map->l_mach.fptr_table,
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(ElfW(Addr)) NULL, (ElfW(Addr)) fptr_table))
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map->l_mach.fptr_table_len = len;
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else
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__munmap (fptr_table, len * sizeof (fptr_table[0]));
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return map->l_mach.fptr_table;
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}
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ElfW(Addr)
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_dl_make_fptr (struct link_map *map, const ElfW(Sym) *sym,
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ElfW(Addr) ip)
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{
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ElfW(Addr) *ftab = map->l_mach.fptr_table;
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const ElfW(Sym) *symtab;
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Elf_Symndx symidx;
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struct local *l;
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if (__builtin_expect (ftab == NULL, 0))
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ftab = make_fptr_table (map);
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symtab = (const void *) D_PTR (map, l_info[DT_SYMTAB]);
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symidx = sym - symtab;
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if (symidx >= map->l_mach.fptr_table_len)
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_dl_signal_error (0, NULL, NULL,
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"internal error: symidx out of range of fptr table");
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while (ftab[symidx] == NULL)
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{
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/* GOT has already been relocated in elf_get_dynamic_info -
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don't try to relocate it again. */
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ElfW(Addr) fdesc
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= make_fdesc (ip, map->l_info[DT_PLTGOT]->d_un.d_ptr);
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if (__builtin_expect (COMPARE_AND_SWAP (&ftab[symidx], (ElfW(Addr)) NULL,
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fdesc), 1))
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{
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/* Noone has updated the entry and the new function
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descriptor has been installed. */
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#if 0
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const char *strtab
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= (const void *) D_PTR (map, l_info[DT_STRTAB]);
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ELF_MACHINE_LOAD_ADDRESS (l, local);
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if (l->root != &l->boot_table
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|| l->boot_table.first_unused > 20)
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_dl_debug_printf ("created fdesc symbol `%s' at %lx\n",
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strtab + sym->st_name, ftab[symidx]);
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#endif
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break;
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}
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else
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{
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/* We created a duplicated function descriptor. We put it on
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free-list. */
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struct fdesc *f = (struct fdesc *) fdesc;
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ELF_MACHINE_LOAD_ADDRESS (l, local);
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do
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f->ip = (ElfW(Addr)) l->free_list;
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while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &l->free_list,
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f->ip, fdesc));
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}
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}
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return ftab[symidx];
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}
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void
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_dl_unmap (struct link_map *map)
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{
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ElfW(Addr) *ftab = map->l_mach.fptr_table;
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struct fdesc *head = NULL, *tail = NULL;
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size_t i;
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__munmap ((void *) map->l_map_start,
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map->l_map_end - map->l_map_start);
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if (ftab == NULL)
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return;
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/* String together the fdesc structures that are being freed. */
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for (i = 0; i < map->l_mach.fptr_table_len; ++i)
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{
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if (ftab[i])
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{
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*(struct fdesc **) ftab[i] = head;
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head = (struct fdesc *) ftab[i];
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if (tail = NULL)
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tail = head;
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}
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}
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/* Prepend the new list to the free_list: */
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if (tail)
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do
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tail->ip = (ElfW(Addr)) local.free_list;
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while (! COMPARE_AND_SWAP ((ElfW(Addr) *) &local.free_list,
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tail->ip, (ElfW(Addr)) head));
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__munmap (ftab, (map->l_mach.fptr_table_len
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* sizeof (map->l_mach.fptr_table[0])));
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map->l_mach.fptr_table = NULL;
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}
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ElfW(Addr)
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_dl_lookup_address (const void *address)
|
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{
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ElfW(Addr) addr = (ElfW(Addr)) address;
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struct fdesc_table *t;
|
||||
unsigned long int i;
|
||||
|
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for (t = local.root; t != NULL; t = t->next)
|
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{
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i = (struct fdesc *) addr - &t->fdesc[0];
|
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if (i < t->first_unused && addr == (ElfW(Addr)) &t->fdesc[i])
|
||||
{
|
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addr = t->fdesc[i].ip;
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||||
break;
|
||||
}
|
||||
}
|
||||
return addr;
|
||||
}
|
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44
sysdeps/generic/dl-fptr.h
Normal file
44
sysdeps/generic/dl-fptr.h
Normal file
@ -0,0 +1,44 @@
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||||
/* Function descriptors. Generic version.
|
||||
Copyright (C) 1995, 1996, 1997, 2000, 2001 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 dl_fptr_h
|
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#define dl_fptr_h 1
|
||||
|
||||
/* An FDESC is a function descriptor. */
|
||||
|
||||
struct fdesc
|
||||
{
|
||||
ElfW(Addr) ip; /* code entry point */
|
||||
ElfW(Addr) gp; /* global pointer */
|
||||
};
|
||||
|
||||
struct fdesc_table
|
||||
{
|
||||
struct fdesc_table *next;
|
||||
unsigned int len; /* # of entries in fdesc table */
|
||||
volatile unsigned int first_unused; /* index of first available entry */
|
||||
struct fdesc fdesc[0];
|
||||
};
|
||||
|
||||
extern ElfW(Addr) _dl_boot_fptr_table [];
|
||||
|
||||
extern ElfW(Addr) _dl_make_fptr (struct link_map *, const ElfW(Sym) *,
|
||||
ElfW(Addr));
|
||||
|
||||
#endif /* !dl_fptr_h */
|
||||
@ -1,5 +1,5 @@
|
||||
/* Get the symbol address. IA-64 version.
|
||||
Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
|
||||
/* Function descriptors. IA64 version.
|
||||
Copyright (C) 2003 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
|
||||
@ -17,17 +17,20 @@
|
||||
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
||||
02111-1307 USA. */
|
||||
|
||||
#include <ldsodefs.h>
|
||||
#include <dl-machine.h>
|
||||
#ifndef dl_ia64_fptr_h
|
||||
#define dl_ia64_fptr_h 1
|
||||
|
||||
void *
|
||||
_dl_symbol_address (struct link_map *map, const Elf64_Sym *ref)
|
||||
{
|
||||
Elf64_Addr value = (map ? map->l_addr : 0) + ref->st_value;
|
||||
#include <ia64intrin.h>
|
||||
#include <sysdeps/generic/dl-fptr.h>
|
||||
|
||||
/* On ia64, we have to return the pointer to function descriptor. */
|
||||
if (ELFW(ST_TYPE) (ref->st_info) == STT_FUNC)
|
||||
return (void *) __ia64_make_fptr (map, ref, value);
|
||||
else
|
||||
return (void *) value;
|
||||
}
|
||||
#define COMPARE_AND_SWAP(ptr,old,new) \
|
||||
__sync_bool_compare_and_swap ((ptr), (old), (new))
|
||||
|
||||
/* There are currently 123 dynamic symbols in ld.so.
|
||||
ELF_MACHINE_BOOT_FPTR_TABLE_LEN needs to be at least that big. */
|
||||
#define ELF_MACHINE_BOOT_FPTR_TABLE_LEN 200
|
||||
|
||||
#define ELF_MACHINE_LOAD_ADDRESS(var,symbol) \
|
||||
asm ("addl %0 = @gprel (" #symbol "), gp" : "=r" (var));
|
||||
|
||||
#endif /* !dl_ia64_fptr_h */
|
||||
@ -26,44 +26,22 @@
|
||||
#include <string.h>
|
||||
#include <link.h>
|
||||
#include <errno.h>
|
||||
#include <dl-fptr.h>
|
||||
#include <tls.h>
|
||||
|
||||
/* Translate a processor specific dynamic tag to the index
|
||||
in l_info array. */
|
||||
#define DT_IA_64(x) (DT_IA_64_##x - DT_LOPROC + DT_NUM)
|
||||
|
||||
/* There are currently 123 dynamic symbols in ld.so.
|
||||
IA64_BOOT_FPTR_TABLE_LEN needs to be at least that big. */
|
||||
#define IA64_BOOT_FPTR_TABLE_LEN 200
|
||||
|
||||
/* An FDESC is a function descriptor. */
|
||||
|
||||
struct ia64_fdesc
|
||||
{
|
||||
Elf64_Addr ip; /* code entry point */
|
||||
Elf64_Addr gp; /* global pointer */
|
||||
};
|
||||
|
||||
struct ia64_fdesc_table
|
||||
{
|
||||
struct ia64_fdesc_table *next;
|
||||
unsigned int len; /* # of entries in fdesc table */
|
||||
volatile unsigned int first_unused; /* index of first available entry */
|
||||
struct ia64_fdesc fdesc[0];
|
||||
};
|
||||
|
||||
extern Elf64_Addr __ia64_make_fptr (struct link_map *, const Elf64_Sym *,
|
||||
Elf64_Addr);
|
||||
|
||||
static inline void
|
||||
__ia64_init_bootstrap_fdesc_table (struct link_map *map)
|
||||
{
|
||||
Elf64_Addr *boot_table;
|
||||
|
||||
/* careful: this will be called before got has been relocated... */
|
||||
asm (";; addl %0 = @gprel (__ia64_boot_fptr_table), gp" : "=r"(boot_table));
|
||||
asm (";; addl %0 = @gprel (_dl_boot_fptr_table), gp" : "=r"(boot_table));
|
||||
|
||||
map->l_mach.fptr_table_len = IA64_BOOT_FPTR_TABLE_LEN;
|
||||
map->l_mach.fptr_table_len = ELF_MACHINE_BOOT_FPTR_TABLE_LEN;
|
||||
map->l_mach.fptr_table = boot_table;
|
||||
}
|
||||
|
||||
@ -142,7 +120,7 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
|
||||
|
||||
/* This function will be called to perform the relocation. */
|
||||
if (!profile)
|
||||
doit = (Elf64_Addr) ((struct ia64_fdesc *) &_dl_runtime_resolve)->ip;
|
||||
doit = (Elf64_Addr) ((struct fdesc *) &_dl_runtime_resolve)->ip;
|
||||
else
|
||||
{
|
||||
if (_dl_name_match_p (GL(dl_profile), l))
|
||||
@ -151,7 +129,7 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
|
||||
want profiling and the timers are started. */
|
||||
GL(dl_profile_map) = l;
|
||||
}
|
||||
doit = (Elf64_Addr) ((struct ia64_fdesc *) &_dl_runtime_profile)->ip;
|
||||
doit = (Elf64_Addr) ((struct fdesc *) &_dl_runtime_profile)->ip;
|
||||
}
|
||||
|
||||
reserve[1] = doit;
|
||||
@ -579,7 +557,7 @@ elf_machine_rela (struct link_map *map,
|
||||
return;
|
||||
}
|
||||
else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_FPTR64LSB))
|
||||
value = __ia64_make_fptr (sym_map, sym, value);
|
||||
value = _dl_make_fptr (sym_map, sym, value);
|
||||
else if (R_IA64_TYPE (r_type) == R_IA64_TYPE (R_IA64_PCREL64LSB))
|
||||
value -= (Elf64_Addr) reloc_addr & -16;
|
||||
#if defined USE_TLS && (!defined RTLD_BOOTSTRAP || defined USE___THREAD)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user