![Ulrich Drepper](/assets/img/avatar_default.png)
1998-09-22 19:58 -0400 Zack Weinberg <zack@rabi.phys.columbia.edu> * posix/execvp.c: Don't give up searching the PATH if execve returns ENOTDIR. 1998-09-22 12:53 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/init-first.c (init): Don't call setfpucw only if _dl_fpu_control_set is set. * sysdeps/generic/dl-sysdep.c: Don't set _dl_fpu_control_set. * elf/rtld.c: Don't define _dl_fpu_control_set. * elf/Versions: Remove _dl_fpu_control_set. 1998-09-22 11:51 Ulrich Drepper <drepper@cygnus.com> * sysdeps/unix/sysv/linux/alpha/bits/sigaction.h (SA_ONSTACK): Define. * sysdeps/unix/sysv/linux/sparc/bits/sigaction.h: Likewise. * sysdeps/unix/sysv/linux/mips/bits/sigaction.h: Likewise. Correct values of other SA_* macros according to kernel headers. 1998-09-22 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * elf/dl-load.c (_dl_init_paths): Avoid warning about unused variable l. * elf/dl-error.c (_dl_catch_error): Avoid warning about clobbering old. 1998-09-21 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * elf/ldsodefs.h: Fix typo in comment. 1998-09-21 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * libio/genops.c (_IO_default_pbackfail): Add cast to unsigned char when comparing buffer contents with putback character. 1998-09-21 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * elf/Makefile (dl-routines, elide-routines.os, rtld-routines): Undo last change. * elf/Versions: Undo last change. Export _dl_fpu_control and _dl_fpu_control_set. * elf/rtld.c (_dl_fpu_control, _dl_fpu_control_set): New variables. Include <fpu_control.h>. * sysdeps/generic/dl-sysdep.c: Store AT_FPUCW value in _dl_fpu_control instead of __fpu_control, set _dl_fpu_control_set to indicate that is was seen. * sysdeps/unix/sysv/linux/init-first.c: Omit call to __setfpucw only if _dl_fpu_control was set and is equal to desired value. * math/Makefile (aux): Undo last change. * math/Versions: Export __fpu_control with version GLIBC_2.0.
193 lines
6.3 KiB
C
193 lines
6.3 KiB
C
/* Error handling for runtime dynamic linker.
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Copyright (C) 1995, 1996, 1997, 1998 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 <setjmp.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <elf/ldsodefs.h>
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#include <bits/libc-lock.h>
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/* This structure communicates state between _dl_catch_error and
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_dl_signal_error. */
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struct catch
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{
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char *errstring; /* Error detail filled in here. */
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jmp_buf env; /* longjmp here on error. */
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};
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/* Multiple threads at once can use the `_dl_catch_error' function. The
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calls can come from `_dl_map_object_deps', `_dlerror_run', or from
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any of the libc functionality which loads dynamic objects (NSS, iconv).
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Therefore we have to be prepared to save the state in thread-local
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memory. `catch' will only be used for the non-threaded case.
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Please note the horrible kludge we have to use to check for the
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thread functions to be defined. The problem is that while running
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ld.so standalone (i.e., before the relocation with the available
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libc symbols) we do not have a real handling of undefined weak symbols.
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All symbols are relocated, regardless of the availability. They are
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relocated relative to the load address of the dynamic linker. Adding
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this start address to zero (the value in the GOT for undefined symbols)
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leads to an address which is the load address of ld.so. Once we have
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relocated with the libc values the value is NULL if the function is
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not available. Our "solution" is to regard NULL and the ld.so load
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address as indicators for unavailable weak symbols. */
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static struct catch *catch;
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#ifdef PIC
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# define tsd_setspecific(data) \
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if (__libc_internal_tsd_set != (void *) _dl_rtld_map.l_addr \
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&& __libc_internal_tsd_set != NULL) \
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__libc_internal_tsd_set (_LIBC_TSD_KEY_DL_ERROR, data); \
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else \
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catch = (data)
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# define tsd_getspecific() \
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(__libc_internal_tsd_set != (void *) _dl_rtld_map.l_addr \
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&& __libc_internal_tsd_set != NULL \
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? (struct catch *) __libc_internal_tsd_get (_LIBC_TSD_KEY_DL_ERROR) \
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: catch)
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#else
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# define tsd_setspecific(data) \
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if (__libc_internal_tsd_set != NULL) \
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__libc_internal_tsd_set (_LIBC_TSD_KEY_DL_ERROR, data); \
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else \
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catch = (data)
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# define tsd_getspecific() \
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(__libc_internal_tsd_set != NULL \
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? (struct catch *) __libc_internal_tsd_get (_LIBC_TSD_KEY_DL_ERROR) \
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: catch)
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#endif
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/* This points to a function which is called when an error is
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received. Unlike the handling of `catch' this function may return.
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The arguments will be the `errstring' and `objname'.
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Since this functionality is not used in normal programs (only in ld.so)
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we do not care about multi-threaded programs here. We keep this as a
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global variable. */
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static receiver_fct receiver;
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void
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internal_function
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_dl_signal_error (int errcode,
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const char *objname,
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const char *errstring)
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{
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struct catch *lcatch;
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if (! errstring)
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errstring = "DYNAMIC LINKER BUG!!!";
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lcatch = tsd_getspecific ();
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if (lcatch != NULL)
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{
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/* We are inside _dl_catch_error. Return to it. We have to
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duplicate the error string since it might be allocated on the
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stack. */
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size_t objname_len = objname ? strlen (objname) + 2 : 0;
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size_t errstring_len = strlen (errstring) + 1;
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lcatch->errstring = malloc (objname_len + errstring_len);
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if (lcatch->errstring != NULL)
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{
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if (objname_len > 0)
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{
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memcpy (lcatch->errstring, objname, objname_len - 2);
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memcpy (lcatch->errstring + objname_len - 2, ": ", 2);
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}
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memcpy (lcatch->errstring + objname_len, errstring, errstring_len);
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}
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longjmp (lcatch->env, errcode ?: -1);
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}
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else if (receiver)
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{
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/* We are inside _dl_receive_error. Call the user supplied
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handler and resume the work. The receiver will still be
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installed. */
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(*receiver) (errcode, objname, errstring);
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}
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else
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{
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/* Lossage while resolving the program's own symbols is always fatal. */
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char buffer[1024];
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_dl_sysdep_fatal (_dl_argv[0] ?: "<program name unknown>",
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": error in loading shared libraries: ",
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objname ?: "", objname && *objname ? ": " : "",
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errstring, errcode ? ": " : "",
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(errcode
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? __strerror_r (errcode, buffer, sizeof buffer)
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: ""), "\n", NULL);
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}
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}
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int
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internal_function
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_dl_catch_error (char **errstring,
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void (*operate) (void *),
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void *args)
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{
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int errcode;
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struct catch *volatile old;
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struct catch c;
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/* We need not handle `receiver' since setting a `catch' is handled
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before it. */
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/* Some systems (e.g., SPARC) handle constructors to local variables
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inefficient. So we initialize `c' by hand. */
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c.errstring = NULL;
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old = tsd_getspecific ();
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errcode = setjmp (c.env);
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if (errcode == 0)
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{
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tsd_setspecific (&c);
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(*operate) (args);
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tsd_setspecific (old);
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*errstring = NULL;
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return 0;
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}
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/* We get here only if we longjmp'd out of OPERATE. */
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tsd_setspecific (old);
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*errstring = c.errstring;
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return errcode == -1 ? 0 : errcode;
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}
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void
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internal_function
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_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
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{
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struct catch *old_catch;
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receiver_fct old_receiver;
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old_catch = tsd_getspecific ();
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old_receiver = receiver;
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/* Set the new values. */
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tsd_setspecific (NULL);
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receiver = fct;
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(*operate) (args);
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tsd_setspecific (old_catch);
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receiver = old_receiver;
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}
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