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/* Copyright (C) 2003 Free Software Foundation, Inc.
written by Alexandre Oliva <aoliva@redhat.com>
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
Library 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; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#define _GNU_SOURCE
#include <link.h>
#include <sys/types.h>
#include <elf.h>
#include <bits/elf-fdpic.h>
/* This file is to be compiled into crt object files, to enable
executables to easily self-relocate. */
#define hidden __attribute__((__visibility__("hidden")))
/* Compute the runtime address of pointer in the range [p,e), and then
map the pointer pointed by it. */
inline static void ***
reloc_range_indirect (void ***p, void ***e,
const struct elf32_fdpic_loadmap *map)
{
while (p < e)
{
void *ptr = __reloc_pointer (*p, map);
if (ptr)
{
void *pt;
if ((long)ptr & 3)
__builtin_memcpy(&pt, ptr, sizeof(pt));
else
pt = *(void**)ptr;
pt = __reloc_pointer (pt, map);
if ((long)ptr & 3)
__builtin_memcpy(ptr, &pt, sizeof(pt));
else
*(void**)ptr = pt;
}
p++;
}
return p;
}
/* Call __reloc_range_indirect for the given range except for the last
entry, whose contents are only relocated. It's expected to hold
the GOT value. */
void* hidden
__self_reloc (const struct elf32_fdpic_loadmap *map,
void ***p, void ***e)
{
p = reloc_range_indirect (p, e-1, map);
if (p >= e)
return (void*)-1;
return __reloc_pointer (*p, map);
}
#if 0
/* These are other functions that might be useful, but that we don't
need. */
/* Remap pointers in [p,e). */
inline static void**
reloc_range (void **p, void **e,
const struct elf32_fdpic_loadmap *map)
{
while (p < e)
{
*p = __reloc_pointer (*p, map);
p++;
}
return p;
}
/* Remap p, adjust e by the same offset, then map the pointers in the
range determined by them. */
void hidden
__reloc_range (const struct elf32_fdpic_loadmap *map,
void **p, void **e)
{
void **old = p;
p = __reloc_pointer (p, map);
e += p - old;
reloc_range (p, e, map);
}
/* Remap p, adjust e by the same offset, then map pointers referenced
by the (unadjusted) pointers in the range. Return the relocated
value of the last pointer in the range. */
void* hidden
__reloc_range_indirect (const struct elf32_fdpic_loadmap *map,
void ***p, void ***e)
{
void ***old = p;
p = __reloc_pointer (p, map);
e += p - old;
return reloc_range_indirect (p, e, map);
}
#endif
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