/* Copyright (C) 2003, 2004 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. In addition to the permissions in the GNU Lesser General Public License, the Free Software Foundation gives you unlimited permission to link the compiled version of this file with other programs, and to distribute those programs without any restriction coming from the use of this file. (The GNU Lesser General Public License restrictions do apply in other respects; for example, they cover modification of the file, and distribution when not linked into another program.) 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 <sys/types.h> #include <link.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