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1997-07-26 04:14 Ulrich Drepper <drepper@cygnus.com> * elf/Makefile (distribute): Add genrtldtbl.awk. (before-compile): Add rtldtbl.h. (GAWK): New variable. (generated): Add trusted-dirs.h and rtldtbl.h. ($(objpfx)rtldtbl.h): New rule. File is needed by dl-load.c. * elf/dl-load.c: Rewrite. Now use cache and look for shared objects in machine dependent directories. * elf/dl-object.c (_dl_new_object): Initialize l_rpath_dirs member. * elf/dl-support.c: Rename function to non_dynamic_init and add initialization for _dl_platform, _dl_platformlen, _dl_pagesize and call to initializer for search path. * elf/elf.h: Add AT_PLATFORM and AT_HWCAP. * elf/genrtldtbl.awk: New file. * elf/link.h: Add type definitions and declarations for search path cache. * elf/rtld.c: Add definitions of variables used for search path cache. * sysdeps/generic/dl-sysdep.c: Let auxiliary vector initialize _dl_platform. Initialize _dl_pagesize early and use this value. * sysdeps/i386/dl-machine.h: Add code for _dl_platform handling. * sysdeps/mach/hurd/dl-sysdep.c: Initialize _dl_pagesize. * sysdeps/unix/sysv/linux/dl-sysdep.c: Use _dl_pagesize instead of calling getpagesize. * elf/dl-error.c (_dl_signal_error): Make message nicer. * nss/libnss_files.map: Fix typo. Reported by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>. * sysdeps/generic/strsep.c: Optimize case where separator set contains only one character. * sysdeps/libm-ieee754/s_ccosh.c: Correct sign of result for real == +-Inf. * sysdeps/libm-ieee754/s_ccoshf.c: Likewise. * sysdeps/libm-ieee754/s_ccoshl.c: Likewise. 1997-07-25 09:15 H.J. Lu <hjl@gnu.ai.mit.edu> * sysdeps/sparc/udiv_qrnnd.S: Check PIC instead of __PIC__. * sysdeps/unix/sysv/linux/sparc/__sigtrampoline.S: Likewise. * sysdeps/unix/mips/sysdep.S: Likewise. * sysdeps/unix/sysv/linux/mips/clone.S: Likewise. * sysdeps/mips/bsd-_setjmp.S: Remove __PIC__ comment. * sysdeps/mips/bsd-setjmp.S: Likewise. * sysdeps/mips/dl-machine.h: Remove extra stuff. * sysdeps/mips/mips64/dl-machine.h: Likewise. 1997-07-25 18:55 Philip Blundell <Philip.Blundell@pobox.com> * sysdeps/standalone/arm/sysdep.c: New file. 1997-07-25 13:25 Philip Blundell <Philip.Blundell@pobox.com> * aout/Makefile: New file. * Makeconfig (binfmt-subdir): Assume a.out when not ELF. * sysdeps/generic/machine-gmon.h: Add warning about limitations of __builtin_return_address(). * sysdeps/arm/machine-gmon.h: New file, use assembly to avoid above problem. 1997-07-25 16:24 H.J. Lu <hjl@gnu.ai.mit.edu> * elf/dl-deps.c (_dl_map_object_deps): Fix a typo. 1997-07-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * math/libm-test.c (ccos_test, ccosh_test): Fix sign in some tests. 1997-07-24 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sunrpc/clnt_udp.c (clntudp_call): Rename cu_wait from timeout to not shadow the variable in the outer scope.
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/* Operating system support for run-time dynamic linker. Generic Unix version.
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Copyright (C) 1995, 1996, 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <elf.h>
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#include <entry.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <link.h>
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#include <unistd.h>
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#include <dl-machine.h>
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extern int _dl_argc;
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extern char **_dl_argv;
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extern char **_environ;
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extern size_t _dl_pagesize;
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extern const char *_dl_platform;
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extern size_t _dl_platformlen;
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extern void _end;
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extern void ENTRY_POINT (void);
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int __libc_enable_secure;
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int __libc_multiple_libcs; /* Defining this here avoids the inclusion
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of init-first. */
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ElfW(Addr)
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_dl_sysdep_start (void **start_argptr,
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void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum,
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ElfW(Addr) *user_entry))
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{
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const ElfW(Phdr) *phdr = NULL;
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ElfW(Word) phnum = 0;
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ElfW(Addr) user_entry;
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ElfW(auxv_t) *av;
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uid_t uid = 0;
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uid_t euid = 0;
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gid_t gid = 0;
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gid_t egid = 0;
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unsigned int seen;
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user_entry = (ElfW(Addr)) &ENTRY_POINT;
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_dl_argc = *(long *) start_argptr;
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_dl_argv = (char **) start_argptr + 1;
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_environ = &_dl_argv[_dl_argc + 1];
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_dl_platform = NULL; /* Default to nothing known about the platform. */
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start_argptr = (void **) _environ;
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while (*start_argptr)
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++start_argptr;
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seen = 0;
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#define M(type) (1 << (type))
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for (av = (void *) ++start_argptr;
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av->a_type != AT_NULL;
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seen |= M ((++av)->a_type))
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switch (av->a_type)
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{
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case AT_PHDR:
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phdr = av->a_un.a_ptr;
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break;
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case AT_PHNUM:
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phnum = av->a_un.a_val;
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break;
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case AT_PAGESZ:
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_dl_pagesize = av->a_un.a_val;
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break;
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case AT_ENTRY:
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user_entry = av->a_un.a_val;
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break;
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case AT_UID:
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uid = av->a_un.a_val;
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break;
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case AT_GID:
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gid = av->a_un.a_val;
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break;
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case AT_EUID:
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euid = av->a_un.a_val;
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break;
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case AT_EGID:
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egid = av->a_un.a_val;
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break;
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case AT_PLATFORM:
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_dl_platform = av->a_un.a_ptr;
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break;
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case AT_HWCAP:
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/* Well, what shall we use? A string or an integer with bits? */
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break;
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}
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/* Linux doesn't provide us with any of these values on the stack
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when the dynamic linker is run directly as a program. */
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#define SEE(UID, uid) if ((seen & M (AT_##UID)) == 0) uid = __get##uid ()
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SEE (UID, uid);
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SEE (GID, gid);
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SEE (EUID, euid);
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SEE (EGID, egid);
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__libc_enable_secure = uid != euid || gid != egid;
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if (_dl_pagesize == 0)
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_dl_pagesize = __getpagesize ();
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#ifdef DL_SYSDEP_INIT
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DL_SYSDEP_INIT;
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#endif
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#ifdef DL_PLATFORM_INIT
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DL_PLATFORM_INIT;
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#endif
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/* Determine the length of the platform name. */
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if (_dl_platform != NULL)
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_dl_platformlen = strlen (_dl_platform);
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if (__sbrk (0) == &_end)
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/* The dynamic linker was run as a program, and so the initial break
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starts just after our bss, at &_end. The malloc in dl-minimal.c
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will consume the rest of this page, so tell the kernel to move the
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break up that far. When the user program examines its break, it
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will see this new value and not clobber our data. */
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__sbrk (_dl_pagesize - ((&_end - (void *) 0) & (_dl_pagesize - 1)));
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(*dl_main) (phdr, phnum, &user_entry);
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return user_entry;
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}
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void
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_dl_sysdep_start_cleanup (void)
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{
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}
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