mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-09 04:11:27 +08:00
ce460d04a5
changed from [USE_TLS && HAVE___THREAD]. * sysdeps/i386/dl-machine.h (elf_machine_type_class, elf_machine_rel): Disable TLS relocs if [RTLD_BOOTSTRAP && !USE___THREAD]. * sysdeps/x86_64/dl-machine.h (elf_machine_type_class, elf_machine_rela): Likewise. * sysdeps/sh/dl-machine.h (elf_machine_type_class, elf_machine_rela): Likewise. * include/link.h (struct link_map): Remove member l_tls_tp_initialized. * elf/rtld.c (_dl_start_final, dl_main): Don't use it. (_dl_start): Conditionalize PT_TLS check on [USE___THREAD]. * sysdeps/i386/dl-tls.h (__TLS_GET_ADDR): Use ___tls_get_addr_internal instead of ___tls_get_addr. (___tls_get_addr_internal): Add attribute_hidden to decl. * sysdeps/generic/ldsodefs.h (struct rtld_global): New variable _dl_error_catch_tsd. * elf/rtld.c (startup_error_tsd): New function. (dl_main): Point _dl_error_catch_tsd at that. * elf/dl-error.c: Don't use libc-tsd.h for DL_ERROR, use new function pointer instead. * elf/dl-tsd.c: New file. * elf/Makefile (routines): Add it. 2002-10-07 Roland McGrath <roland@redhat.com> * elf/dl-misc.c (_dl_debug_vdprintf): Use INTERNAL_SYSCALL macro for writev if it's available. Otherwise if [RTLD_PRIVATE_ERRNO] then take _dl_load_lock around calling __writev. * sysdeps/unix/sysv/linux/i386/sysdep.h (INTERNAL_SYSCALL): New macro. (INLINE_SYSCALL): Use that. * sysdeps/generic/dl-sysdep.h: New file. * sysdeps/mach/hurd/dl-sysdep.h: New file. * sysdeps/generic/ldsodefs.h: Include <dl-sysdep.h>. * include/errno.h [IS_IN_rtld]: Include <dl-sysdep.h> to define ... [RTLD_PRIVATE_ERRNO]: Use a hidden global variable for errno and access it directly. * elf/dl-minimal.c (__errno_location): Removed. * sysdeps/unix/i386/sysdep.S (__syscall_errno) [RTLD_PRIVATE_ERRNO]: Use GOTOFF access for errno. * sysdeps/unix/sysv/linux/i386/sysdep.h [RTLD_PRIVATE_ERRNO] (SYSCALL_ERROR_HANDLER): Likewise. * sysdeps/unix/x86_64/sysdep.S (__syscall_errno) [RTLD_PRIVATE_ERRNO]: Use PC-relative access for errno. * sysdeps/unix/sysv/linux/x86_64/sysdep.h [RTLD_PRIVATE_ERRNO] (SYSCALL_ERROR_HANDLER): Likewise. * include/tls.h: New file. (USE___THREAD): New macro. Define to 1 under [USE_TLS && HAVE___THREAD] and only when compiling libc or libpthread. * sysdeps/unix/sysv/linux/i386/sysdep.h [USE___THREAD]: Conditional changed from [USE_TLS && HAVE___THREAD]. * sysdeps/unix/sysv/linux/x86_64/sysdep.h: Likewise. * sysdeps/unix/i386/sysdep.S: Likewise. * sysdeps/unix/x86_64/sysdep.S: Likewise. * include/errno.h: Likewise. * include/netdb.h: Likewise. * include/resolv.h: Likewise. * sysdeps/generic/errno.c: New file. * csu/Makefile (aux): New variable, list errno. * sysdeps/unix/sysv/linux/i386/sysdep.S (errno, _errno): Remove defns. * sysdeps/unix/sysv/linux/m68k/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/x86_64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/s390/s390-64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/s390/s390-32/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/arm/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/cris/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/hppa/sysdep.c: Likewise. * sysdeps/unix/sysv/linux/ia64/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/powerpc/sysdep.c: Likewise. * sysdeps/unix/sysv/linux/sparc/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/sh/sysdep.S: Likewise. * sysdeps/unix/alpha/sysdep.S: Likewise. * sysdeps/generic/start.c: Likewise. * sysdeps/unix/start.c: Likewise. * sysdeps/unix/arm/start.c: Likewise. * sysdeps/unix/bsd/ultrix4/mips/start.S: Likewise. * sysdeps/unix/sparc/start.c: Likewise. * sysdeps/unix/sysv/irix4/start.c: Likewise. * sysdeps/unix/sysv/linux/mips/sysdep.S: File removed. * manual/search.texi (Tree Search Function, Hash Search Function): Mention search.h clearly. 2002-10-05 Roland McGrath <roland@redhat.com> * elf/dl-fxstat64.c: File removed. * elf/dl-xstat64.c: File removed. * elf/Makefile (rtld-routines): Remove them. * sysdeps/unix/sysv/linux/xstat64.c: Remove RTLD_STAT64 conditionals. Instead, use strong_alias instead of versioned_symbol in the !SHLIB_COMPAT case. * sysdeps/unix/sysv/linux/fxstat64.c: Likewise. * sysdeps/unix/sysv/linux/lxstat64.c: Likewise. * include/shlib-compat.h (SHLIB_COMPAT): Require that IS_IN_##lib be defined nonzero. [! NOT_IN_libc] (IS_IN_libc): Define it. * cppflags-iterator.mk (CPPFLAGS-$(cpp-src)): Use -Dx=1 not just -Dx. * elf/Makefile (CPPFLAGS-.os): Likewise. * sunrpc/rpc_main.c (main): Don't declare with noreturn attribute. Return the status instead of calling exit. * Makeconfig (CFLAGS): Prepend -std=gnu99. * Makerules (+make-deps): Use $(CFLAGS) only for .c sources. Remove superfluous rm command, whose @ plus make bugs hid all these commands from the make output. * include/stubs-prologue.h: New file. Give #error under #ifdef _LIBC. * Makefile ($(inst_includedir)/gnu/stubs.h): Depend on it. Use that file's contents instead of literal echo's for the prologue. * include/features.h: Include <gnu/stubs.h> unconditionally. * include/gnu/stubs.h: New file. 2002-09-30 Roland McGrath <roland@redhat.com> * elf/rtld-Rules: New file. * elf/Makefile ($(objpfx)librtld.map, $(objpfx)librtld.mk, $(objpfx)rtld-libc.a): New targets. (generated): Add them. (reloc-link): Remove -o $@ from the variable. ($(objpfx)dl-allobjs.os): Add -o $@ after $(reloc-link). (distribute): Add rtld-Rules. (CPPFLAGS-.os): Define this instead of CFLAGS-.os. * Makerules ($(+sysdir_pfx)sysd-rules): Emit rules for rtld-% targets. (common-mostlyclean, common-clean): Clean up rtld-* files. * sysdeps/unix/make-syscalls.sh: Add rtld-*.os target name to rules.
356 lines
8.5 KiB
C
356 lines
8.5 KiB
C
/* Minimal replacements for basic facilities used in the dynamic linker.
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Copyright (C) 1995,96,97,98,2000,2001,2002 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 <errno.h>
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#include <limits.h>
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#include <string.h>
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#include <tls.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include <ldsodefs.h>
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#include <stdio-common/_itoa.h>
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#include <assert.h>
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/* Minimal `malloc' allocator for use while loading shared libraries.
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No block is ever freed. */
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static void *alloc_ptr, *alloc_end, *alloc_last_block;
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/* Declarations of global functions. */
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extern void weak_function free (void *ptr);
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extern void * weak_function realloc (void *ptr, size_t n);
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extern unsigned long int weak_function __strtoul_internal (const char *nptr,
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char **endptr,
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int base,
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int group);
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extern unsigned long int weak_function strtoul (const char *nptr,
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char **endptr, int base);
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/* Allocate an aligned memory block. */
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void * weak_function
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__libc_memalign (size_t align, size_t n)
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{
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#ifdef MAP_ANON
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#define _dl_zerofd (-1)
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#else
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extern int _dl_zerofd;
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if (_dl_zerofd == -1)
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_dl_zerofd = _dl_sysdep_open_zero_fill ();
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#define MAP_ANON 0
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#endif
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if (alloc_end == 0)
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{
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/* Consume any unused space in the last page of our data segment. */
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extern int _end attribute_hidden;
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alloc_ptr = &_end;
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alloc_end = (void *) 0 + (((alloc_ptr - (void *) 0)
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+ GL(dl_pagesize) - 1)
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& ~(GL(dl_pagesize) - 1));
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}
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/* Make sure the allocation pointer is ideally aligned. */
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alloc_ptr = (void *) 0 + (((alloc_ptr - (void *) 0) + align - 1)
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& ~(align - 1));
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if (alloc_ptr + n >= alloc_end)
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{
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/* Insufficient space left; allocate another page. */
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caddr_t page;
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size_t nup = (n + GL(dl_pagesize) - 1) & ~(GL(dl_pagesize) - 1);
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page = __mmap (0, nup, PROT_READ|PROT_WRITE,
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MAP_ANON|MAP_PRIVATE, _dl_zerofd, 0);
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assert (page != MAP_FAILED);
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if (page != alloc_end)
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alloc_ptr = page;
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alloc_end = page + nup;
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}
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alloc_last_block = (void *) alloc_ptr;
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alloc_ptr += n;
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return alloc_last_block;
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}
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void * weak_function
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malloc (size_t n)
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{
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return __libc_memalign (sizeof (double), n);
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}
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/* We use this function occasionally since the real implementation may
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be optimized when it can assume the memory it returns already is
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set to NUL. */
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void * weak_function
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calloc (size_t nmemb, size_t size)
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{
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size_t total = nmemb * size;
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void *result = malloc (total);
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return memset (result, '\0', total);
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}
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/* This will rarely be called. */
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void weak_function
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free (void *ptr)
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{
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/* We can free only the last block allocated. */
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if (ptr == alloc_last_block)
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alloc_ptr = alloc_last_block;
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}
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/* This is only called with the most recent block returned by malloc. */
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void * weak_function
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realloc (void *ptr, size_t n)
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{
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void *new;
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if (ptr == NULL)
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return malloc (n);
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assert (ptr == alloc_last_block);
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alloc_ptr = alloc_last_block;
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new = malloc (n);
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assert (new == ptr);
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return new;
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}
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/* Avoid signal frobnication in setjmp/longjmp. Keeps things smaller. */
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#include <setjmp.h>
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int weak_function
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__sigjmp_save (sigjmp_buf env, int savemask __attribute__ ((unused)))
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{
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env[0].__mask_was_saved = 0;
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return 0;
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}
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void weak_function
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longjmp (jmp_buf env, int val)
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{
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__longjmp (env[0].__jmpbuf, val);
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}
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/* Define our own version of the internal function used by strerror. We
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only provide the messages for some common errors. This avoids pulling
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in the whole error list. */
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char * weak_function
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__strerror_r (int errnum, char *buf, size_t buflen)
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{
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char *msg;
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switch (errnum)
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{
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case ENOMEM:
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msg = (char *) "Cannot allocate memory";
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break;
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case EINVAL:
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msg = (char *) "Invalid argument";
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break;
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case ENOENT:
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msg = (char *) "No such file or directory";
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break;
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case EPERM:
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msg = (char *) "Operation not permitted";
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break;
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case EIO:
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msg = (char *) "Input/output error";
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break;
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case EACCES:
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msg = (char *) "Permission denied";
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break;
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default:
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/* No need to check buffer size, all calls in the dynamic linker
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provide enough space. */
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buf[buflen - 1] = '\0';
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msg = _itoa (errnum, buf + buflen - 1, 10, 0);
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msg = memcpy (msg - (sizeof ("Error ") - 1), "Error ",
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sizeof ("Error ") - 1);
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break;
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}
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return msg;
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}
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#ifndef NDEBUG
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/* Define (weakly) our own assert failure function which doesn't use stdio.
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If we are linked into the user program (-ldl), the normal __assert_fail
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defn can override this one. */
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void weak_function
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__assert_fail (const char *assertion,
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const char *file, unsigned int line, const char *function)
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{
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_dl_fatal_printf ("\
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Inconsistency detected by ld.so: %s: %u: %s%sAssertion `%s' failed!\n",
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file, line, function ?: "", function ? ": " : "",
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assertion);
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}
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rtld_hidden_weak(__assert_fail)
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void weak_function
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__assert_perror_fail (int errnum,
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const char *file, unsigned int line,
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const char *function)
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{
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char errbuf[400];
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_dl_fatal_printf ("\
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Inconsistency detected by ld.so: %s: %u: %s%sUnexpected error: %s.\n",
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file, line, function ?: "", function ? ": " : "",
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__strerror_r (errnum, errbuf, sizeof errbuf));
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}
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rtld_hidden_weak (__assert_perror_fail)
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#endif
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unsigned long int weak_function
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__strtoul_internal (const char *nptr, char **endptr, int base, int group)
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{
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unsigned long int result = 0;
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long int sign = 1;
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while (*nptr == ' ' || *nptr == '\t')
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++nptr;
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if (*nptr == '-')
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{
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sign = -1;
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++nptr;
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}
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else if (*nptr == '+')
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++nptr;
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if (*nptr < '0' || *nptr > '9')
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{
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if (endptr != NULL)
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*endptr = (char *) nptr;
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return 0UL;
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}
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assert (base == 0);
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base = 10;
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if (*nptr == '0')
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{
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if (nptr[1] == 'x' || nptr[1] == 'X')
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{
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base = 16;
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nptr += 2;
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}
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else
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base = 8;
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}
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while (*nptr >= '0' && *nptr <= '9')
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{
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unsigned long int digval = *nptr - '0';
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if (result > LONG_MAX / 10
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|| (result == ULONG_MAX / 10 && digval > ULONG_MAX % 10))
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{
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errno = ERANGE;
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if (endptr != NULL)
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*endptr = (char *) nptr;
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return ULONG_MAX;
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}
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result *= base;
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result += digval;
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++nptr;
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}
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if (endptr != NULL)
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*endptr = (char *) nptr;
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return result * sign;
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}
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/* We always use _itoa instead of _itoa_word in ld.so since the former
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also has to be present and it is never about speed when these
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functions are used. */
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char *
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_itoa (value, buflim, base, upper_case)
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unsigned long long int value;
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char *buflim;
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unsigned int base;
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int upper_case;
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{
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extern const char INTUSE(_itoa_lower_digits)[] attribute_hidden;
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assert (! upper_case);
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do
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*--buflim = INTUSE(_itoa_lower_digits)[value % base];
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while ((value /= base) != 0);
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return buflim;
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}
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/* The following is not a complete strsep implementation. It cannot
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handle empty delimiter strings. But this isn't necessary for the
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execution of ld.so. */
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#undef strsep
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#undef __strsep
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char *
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__strsep (char **stringp, const char *delim)
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{
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char *begin;
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assert (delim[0] != '\0');
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begin = *stringp;
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if (begin != NULL)
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{
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char *end = begin;
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while (*end != '\0' || (end = NULL))
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{
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const char *dp = delim;
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do
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if (*dp == *end)
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break;
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while (*++dp != '\0');
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if (*dp != '\0')
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{
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*end++ = '\0';
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break;
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}
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++end;
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}
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*stringp = end;
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}
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return begin;
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}
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weak_alias (__strsep, strsep)
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strong_alias (__strsep, __strsep_g)
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/* The '_itoa_lower_digits' variable in libc.so is able to handle bases
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up to 36. We don't need this here. */
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const char INTUSE(_itoa_lower_digits)[16] attribute_hidden
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= "0123456789abcdef";
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