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/*
* arch/score/kernel/module.c
*
* Score Processor version.
*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Chen Liqin <liqin.chen@sunplusct.com>
* Lennox Wu <lennox.wu@sunplusct.com>
*
* 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, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/moduleloader.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relindex,
struct module *me)
{
Elf32_Shdr *symsec = sechdrs + symindex;
Elf32_Shdr *relsec = sechdrs + relindex;
Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
Elf32_Rel *rel = (void *)relsec->sh_addr;
unsigned int i;
for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
unsigned long loc;
Elf32_Sym *sym;
s32 r_offset;
r_offset = ELF32_R_SYM(rel->r_info);
if ((r_offset < 0) ||
(r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
me->name, relindex, i);
return -ENOEXEC;
}
sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
if ((rel->r_offset < 0) ||
(rel->r_offset > dstsec->sh_size - sizeof(u32))) {
printk(KERN_ERR "%s: out of bounds relocation, "
"section %d reloc %d offset %d size %d\n",
me->name, relindex, i, rel->r_offset,
dstsec->sh_size);
return -ENOEXEC;
}
loc = dstsec->sh_addr + rel->r_offset;
switch (ELF32_R_TYPE(rel->r_info)) {
case R_SCORE_NONE:
break;
case R_SCORE_ABS32:
*(unsigned long *)loc += sym->st_value;
break;
case R_SCORE_HI16:
break;
case R_SCORE_LO16: {
unsigned long hi16_offset, offset;
unsigned long uvalue;
unsigned long temp, temp_hi;
temp_hi = *((unsigned long *)loc - 1);
temp = *(unsigned long *)loc;
hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
((temp_hi) & 0x7fff)) >> 1;
offset = ((temp >> 16 & 0x03) << 15) |
((temp & 0x7fff) >> 1);
offset = (hi16_offset << 16) | (offset & 0xffff);
uvalue = sym->st_value + offset;
hi16_offset = (uvalue >> 16) << 1;
temp_hi = ((temp_hi) & (~(0x37fff))) |
(hi16_offset & 0x7fff) |
((hi16_offset << 1) & 0x30000);
*((unsigned long *)loc - 1) = temp_hi;
offset = (uvalue & 0xffff) << 1;
temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
((offset << 1) & 0x30000);
*(unsigned long *)loc = temp;
break;
}
case R_SCORE_24: {
unsigned long hi16_offset, offset;
unsigned long uvalue;
unsigned long temp;
temp = *(unsigned long *)loc;
offset = (temp & 0x03FF7FFE);
hi16_offset = (offset & 0xFFFF0000);
offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
uvalue = (sym->st_value + offset) >> 1;
uvalue = uvalue & 0x00ffffff;
temp = (temp & 0xfc008001) |
((uvalue << 2) & 0x3ff0000) |
((uvalue & 0x3fff) << 1);
*(unsigned long *)loc = temp;
break;
}
default:
printk(KERN_ERR "%s: unknown relocation: %u\n",
me->name, ELF32_R_TYPE(rel->r_info));
return -ENOEXEC;
}
}
return 0;
}
int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
unsigned int symindex, unsigned int relsec,
struct module *me)
{
/* Non-standard return value... most other arch's return -ENOEXEC
* for an unsupported relocation variant
*/
return 0;
}
/* Given an address, look for it in the module exception tables. */
const struct exception_table_entry *search_module_dbetables(unsigned long addr)
{
return NULL;
}
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