linux/arch/m32r/kernel/module.c
Jonas Bonn 66574cc054 modules: make arch's use default loader hooks
This patch removes all the module loader hook implementations in the
architecture specific code where the functionality is the same as that
now provided by the recently added default hooks.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
Acked-by: Mike Frysinger <vapier@gentoo.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Tested-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2011-07-24 22:06:04 +09:30

218 lines
6.4 KiB
C

/* Kernel module help for M32R.
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
#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; \
} \
}
#define COPY_UNALIGNED_HWORD(sw, tw, align) \
{ \
void *__s = &(sw), *__t = &(tw); \
unsigned short *__s2 = __s, *__t2 =__t; \
unsigned char *__s1 = __s, *__t1 =__t; \
switch ((align)) \
{ \
case 0: \
*__t2 = *__s2; \
break; \
default: \
*__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;
unsigned short *hlocation;
unsigned short hvalue;
int svalue;
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_M32R_32_RELA:
COPY_UNALIGNED_WORD (*location, value, align);
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_HI16_ULO_RELA:
COPY_UNALIGNED_WORD (*location, value, align);
relocation = (relocation >>16) & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_HI16_SLO_RELA:
COPY_UNALIGNED_WORD (*location, value, align);
if (relocation & 0x8000) relocation += 0x10000;
relocation = (relocation >>16) & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_16_RELA:
hlocation = (unsigned short *)location;
relocation = relocation & 0xffff;
/* RELA must has 0 at relocation field. */
hvalue = relocation;
COPY_UNALIGNED_WORD (hvalue, *hlocation, align);
break;
case R_M32R_SDA16_RELA:
case R_M32R_LO16_RELA:
COPY_UNALIGNED_WORD (*location, value, align);
relocation = relocation & 0xffff;
/* RELA must has 0 at relocation field. */
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_24_RELA:
COPY_UNALIGNED_WORD (*location, value, align);
relocation = relocation & 0xffffff;
/* RELA must has 0 at relocation field. */
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_18_PCREL_RELA:
relocation = (relocation - (Elf32_Addr) location);
if (relocation < -0x20000 || 0x1fffc < relocation)
{
printk(KERN_ERR "module %s: relocation overflow: %u\n",
me->name, relocation);
return -ENOEXEC;
}
COPY_UNALIGNED_WORD (*location, value, align);
if (value & 0xffff)
{
/* RELA must has 0 at relocation field. */
printk(KERN_ERR "module %s: illegal relocation field: %u\n",
me->name, value);
return -ENOEXEC;
}
relocation = (relocation >> 2) & 0xffff;
value += relocation;
COPY_UNALIGNED_WORD (value, *location, align);
break;
case R_M32R_10_PCREL_RELA:
hlocation = (unsigned short *)location;
relocation = (relocation - (Elf32_Addr) location);
COPY_UNALIGNED_HWORD (*hlocation, hvalue, align);
svalue = (int)hvalue;
svalue = (signed char)svalue << 2;
relocation += svalue;
relocation = (relocation >> 2) & 0xff;
hvalue = hvalue & 0xff00;
hvalue += relocation;
COPY_UNALIGNED_HWORD (hvalue, *hlocation, align);
break;
case R_M32R_26_PCREL_RELA:
relocation = (relocation - (Elf32_Addr) location);
if (relocation < -0x2000000 || 0x1fffffc < relocation)
{
printk(KERN_ERR "module %s: relocation overflow: %u\n",
me->name, relocation);
return -ENOEXEC;
}
COPY_UNALIGNED_WORD (*location, value, align);
if (value & 0xffffff)
{
/* RELA must has 0 at relocation field. */
printk(KERN_ERR "module %s: illegal relocation field: %u\n",
me->name, value);
return -ENOEXEC;
}
relocation = (relocation >> 2) & 0xffffff;
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)
{
#if 0
printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
me->name);
return -ENOEXEC;
#endif
return 0;
}