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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.

	* sysdeps/unix/sysv/linux/dl-execstack.c
	(_dl_make_stack_executable): Move common code in front.  Use
	__builtin_expect.
This commit is contained in:
Ulrich Drepper 2004-01-14 00:24:36 +00:00
parent b177ed2b58
commit ea4f25a7f9
5 changed files with 34 additions and 5 deletions
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16
ChangeLog
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@ -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

3
elf/rtld.c
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@ -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

5
sysdeps/generic/dl-sysdep.c
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@ -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

8
sysdeps/generic/ldsodefs.h
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@ -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;

7
sysdeps/generic/libc-start.c
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@ -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. */