mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-15 01:21:06 +00:00
57 lines
2.2 KiB
C
57 lines
2.2 KiB
C
/* Dynamic linker system dependencies for Linux.
|
|
Copyright (C) 1995, 1997, 2001, 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
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* Linux needs some special initialization, but otherwise uses
|
|
the generic dynamic linker system interface code. */
|
|
|
|
#include <unistd.h>
|
|
#include <ldsodefs.h>
|
|
#include "kernel-features.h"
|
|
|
|
#define DL_SYSDEP_INIT frob_brk ()
|
|
|
|
static inline void
|
|
frob_brk (void)
|
|
{
|
|
__brk (0); /* Initialize the break. */
|
|
|
|
#if ! __ASSUME_BRK_PAGE_ROUNDED
|
|
/* If the dynamic linker was executed as a program, then the break may
|
|
start immediately after our data segment. However, dl-minimal.c has
|
|
already stolen the remainder of the page for internal allocations.
|
|
If we don't adjust the break location recorded by the kernel, the
|
|
normal program startup will inquire, find the value at our &_end,
|
|
and start allocating its own data there, clobbering dynamic linker
|
|
data structures allocated there during startup.
|
|
|
|
Later Linux kernels have changed this behavior so that the initial
|
|
break value is rounded up to the page boundary before we start. */
|
|
|
|
extern void *__curbrk attribute_hidden;
|
|
extern void _end attribute_hidden;
|
|
void *const endpage = (void *) 0 + (((__curbrk - (void *) 0)
|
|
+ GLRO(dl_pagesize) - 1)
|
|
& -GLRO(dl_pagesize));
|
|
if (__builtin_expect (__curbrk >= &_end && __curbrk < endpage, 0))
|
|
__brk (endpage);
|
|
#endif
|
|
}
|
|
|
|
#include <sysdeps/generic/dl-sysdep.c>
|