diff options
| -rw-r--r-- | ChangeLog | 16 | ||||
| -rw-r--r-- | elf/rtld.c | 3 | ||||
| -rw-r--r-- | sysdeps/generic/dl-sysdep.c | 5 | ||||
| -rw-r--r-- | sysdeps/generic/ldsodefs.h | 8 | ||||
| -rw-r--r-- | sysdeps/generic/libc-start.c | 7 |
5 files changed, 34 insertions, 5 deletions
@@ -1,9 +1,25 @@ +2004-01-13 Ulrich Drepper <drepper@redhat.com> + + * sysdeps/x86_64/dl-machine.h: Include <tls.h>. + + * elf/rtld.c (_dl_start_final): Initialze __libc_stack_end here. + * sysdeps/generic/dl-sysdep.c: Define __libc_stack_end with + rtld_hidden_def and move into .data.rel.ro section. + * sysdeps/generic/ldsodefs.h: Declare __libc_stack_end with + rtld_hidden_proto. + * sysdeps/generic/libc-start.c: Only initialize __libc_stack_end here + if !SHARED. + 2004-01-13 Richard Henderson <rth@redhat.com> * sysdeps/unix/sysv/linux/alpha/rt_sigaction.S: Fix typo. 2004-01-13 Ulrich Drepper <drepper@redhat.com> + * sysdeps/unix/sysv/linux/dl-execstack.c + (_dl_make_stack_executable): Move common code in front. Use + __builtin_expect. + * sysdeps/unix/sysv/linux/dl-execstack.c: Change interface. Add challenge for caller. * sysdeps/generic/ldsodefs.h: Change declaration and type of hook diff --git a/elf/rtld.c b/elf/rtld.c index 4273a6fb07..91723ccb77 100644 --- a/elf/rtld.c +++ b/elf/rtld.c @@ -253,6 +253,9 @@ _dl_start_final (void *arg, struct dl_start_final_info *info) HP_TIMING_NOW (GL(dl_cpuclock_offset)); #endif + /* Initialize the stack end variable. */ + __libc_stack_end = __builtin_frame_address (0); + /* Call the OS-dependent function to set up life so we can do things like file access. It will call `dl_main' (below) to do all the real work of the dynamic linker, and then unwind our frame and run the user diff --git a/sysdeps/generic/dl-sysdep.c b/sysdeps/generic/dl-sysdep.c index 53b9ea233c..5ec063323f 100644 --- a/sysdeps/generic/dl-sysdep.c +++ b/sysdeps/generic/dl-sysdep.c @@ -1,5 +1,5 @@ /* Operating system support for run-time dynamic linker. Generic Unix version. - Copyright (C) 1995-1998, 2000-2002, 2003 Free Software Foundation, Inc. + Copyright (C) 1995-1998, 2000-2003, 2004 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 @@ -53,7 +53,8 @@ INTVARDEF(__libc_enable_secure) int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion of init-first. */ /* This variable contains the lowest stack address ever used. */ -void *__libc_stack_end; +void *__libc_stack_end __attribute__ ((section (".data.rel.ro"))); +rtld_hidden_def(__libc_stack_end) static ElfW(auxv_t) *_dl_auxv; #ifndef DL_FIND_ARG_COMPONENTS diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h index 852cf51280..f511c5d36f 100644 --- a/sysdeps/generic/ldsodefs.h +++ b/sysdeps/generic/ldsodefs.h @@ -456,6 +456,14 @@ extern void **_dl_initial_error_catch_tsd (void) __attribute__ ((const)) extern int _dl_make_stack_executable (void **stack_endp) internal_function; rtld_hidden_proto (_dl_make_stack_executable) +/* Variable pointing to the end of the stack (or close to it). This value + must be constant over the runtime of the application. Some programs + might use the variable which results in copy relocations on some + platforms. But this does not matter, ld.so can always use the local + copy. */ +extern void *__libc_stack_end; +rtld_hidden_proto (__libc_stack_end) + /* Parameters passed to the dynamic linker. */ extern int _dl_argc attribute_hidden; extern char **_dl_argv; diff --git a/sysdeps/generic/libc-start.c b/sysdeps/generic/libc-start.c index e297b0a424..716bbc7018 100644 --- a/sysdeps/generic/libc-start.c +++ b/sysdeps/generic/libc-start.c @@ -1,4 +1,4 @@ -/* Copyright (C) 1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc. +/* Copyright (C) 1998-2003, 2004 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 @@ -105,10 +105,11 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), INIT_ARGV_and_ENVIRON; - /* Store the lowest stack address. */ +#ifndef SHARED + /* Store the lowest stack address. This is done in ld.so if this is + the code for the DSO. */ __libc_stack_end = stack_end; -#ifndef SHARED # ifdef HAVE_AUX_VECTOR /* First process the auxiliary vector since we need to find the program header to locate an eventually present PT_TLS entry. */ |