1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
146 lines
3.7 KiB
C
146 lines
3.7 KiB
C
/* Kernel module help for SH.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
#include <linux/moduleloader.h>
|
|
#include <linux/elf.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#if 0
|
|
#define DEBUGP printk
|
|
#else
|
|
#define DEBUGP(fmt...)
|
|
#endif
|
|
|
|
void *module_alloc(unsigned long size)
|
|
{
|
|
if (size == 0)
|
|
return NULL;
|
|
return vmalloc(size);
|
|
}
|
|
|
|
|
|
/* Free memory returned from module_alloc */
|
|
void module_free(struct module *mod, void *module_region)
|
|
{
|
|
vfree(module_region);
|
|
/* FIXME: If module_region == mod->init_region, trim exception
|
|
table entries. */
|
|
}
|
|
|
|
/* We don't need anything special. */
|
|
int module_frob_arch_sections(Elf_Ehdr *hdr,
|
|
Elf_Shdr *sechdrs,
|
|
char *secstrings,
|
|
struct module *mod)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#define COPY_UNALIGNED_WORD(sw, tw, align) \
|
|
{ \
|
|
void *__s = &(sw), *__t = &(tw); \
|
|
unsigned short *__s2 = __s, *__t2 = __t; \
|
|
unsigned char *__s1 = __s, *__t1 = __t; \
|
|
switch ((align)) \
|
|
{ \
|
|
case 0: \
|
|
*(unsigned long *) __t = *(unsigned long *) __s; \
|
|
break; \
|
|
case 2: \
|
|
*__t2++ = *__s2++; \
|
|
*__t2 = *__s2; \
|
|
break; \
|
|
default: \
|
|
*__t1++ = *__s1++; \
|
|
*__t1++ = *__s1++; \
|
|
*__t1++ = *__s1++; \
|
|
*__t1 = *__s1; \
|
|
break; \
|
|
} \
|
|
}
|
|
|
|
int apply_relocate_add(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
unsigned int i;
|
|
Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
|
|
Elf32_Sym *sym;
|
|
Elf32_Addr relocation;
|
|
uint32_t *location;
|
|
uint32_t value;
|
|
int align;
|
|
|
|
DEBUGP("Applying relocate section %u to %u\n", relsec,
|
|
sechdrs[relsec].sh_info);
|
|
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
|
/* This is where to make the change */
|
|
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
|
+ rel[i].r_offset;
|
|
/* This is the symbol it is referring to. Note that all
|
|
undefined symbols have been resolved. */
|
|
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
|
|
+ ELF32_R_SYM(rel[i].r_info);
|
|
relocation = sym->st_value + rel[i].r_addend;
|
|
align = (int)location & 3;
|
|
|
|
switch (ELF32_R_TYPE(rel[i].r_info)) {
|
|
case R_SH_DIR32:
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
case R_SH_REL32:
|
|
relocation = (relocation - (Elf32_Addr) location);
|
|
COPY_UNALIGNED_WORD (*location, value, align);
|
|
value += relocation;
|
|
COPY_UNALIGNED_WORD (value, *location, align);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "module %s: Unknown relocation: %u\n",
|
|
me->name, ELF32_R_TYPE(rel[i].r_info));
|
|
return -ENOEXEC;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int apply_relocate(Elf32_Shdr *sechdrs,
|
|
const char *strtab,
|
|
unsigned int symindex,
|
|
unsigned int relsec,
|
|
struct module *me)
|
|
{
|
|
printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
|
|
me->name);
|
|
return -ENOEXEC;
|
|
}
|
|
|
|
int module_finalize(const Elf_Ehdr *hdr,
|
|
const Elf_Shdr *sechdrs,
|
|
struct module *me)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void module_arch_cleanup(struct module *mod)
|
|
{
|
|
}
|