diff options
Diffstat (limited to 'libc/sysdeps/linux/bfin/crtreloc.c')
| -rw-r--r-- | libc/sysdeps/linux/bfin/crtreloc.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/bfin/crtreloc.c b/libc/sysdeps/linux/bfin/crtreloc.c new file mode 100644 index 000000000..4df304346 --- /dev/null +++ b/libc/sysdeps/linux/bfin/crtreloc.c @@ -0,0 +1,145 @@ +/* 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. */ + +#ifdef __BFIN_FDPIC__ + +#define _GNU_SOURCE 1 +#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"))) + +union word { + char c[4]; + void *v; +}; + +/* 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) + { + unsigned char *c = ptr; + int i; + unsigned long v = 0; + for (i = 0; i < 4; i++) + v |= c[i] << 8 * i; + pt = (void *)v; + } + else + pt = *(void**)ptr; + pt = __reloc_pointer (pt, map); + if ((long)ptr & 3) + { + unsigned char *c = ptr; + int i; + unsigned long v = (unsigned long)pt; + for (i = 0; i < 4; i++, v >>= 8) + c[i] = v; + } + 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 + +#endif /* __BFIN_FDPIC__ */ |