143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/*
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* arch/score/kernel/module.c
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*
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* Score Processor version.
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*
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* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
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* Chen Liqin <liqin.chen@sunplusct.com>
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* Lennox Wu <lennox.wu@sunplusct.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see the file COPYING, or write
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* to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/moduleloader.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relindex,
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struct module *me)
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{
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Elf32_Shdr *symsec = sechdrs + symindex;
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Elf32_Shdr *relsec = sechdrs + relindex;
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Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
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Elf32_Rel *rel = (void *)relsec->sh_addr;
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unsigned int i;
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for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
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unsigned long loc;
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Elf32_Sym *sym;
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s32 r_offset;
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r_offset = ELF32_R_SYM(rel->r_info);
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if ((r_offset < 0) ||
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(r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) {
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printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n",
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me->name, relindex, i);
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return -ENOEXEC;
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}
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sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset;
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if ((rel->r_offset < 0) ||
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(rel->r_offset > dstsec->sh_size - sizeof(u32))) {
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printk(KERN_ERR "%s: out of bounds relocation, "
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"section %d reloc %d offset %d size %d\n",
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me->name, relindex, i, rel->r_offset,
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dstsec->sh_size);
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return -ENOEXEC;
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}
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loc = dstsec->sh_addr + rel->r_offset;
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_SCORE_NONE:
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break;
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case R_SCORE_ABS32:
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*(unsigned long *)loc += sym->st_value;
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break;
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case R_SCORE_HI16:
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break;
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case R_SCORE_LO16: {
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unsigned long hi16_offset, offset;
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unsigned long uvalue;
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unsigned long temp, temp_hi;
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temp_hi = *((unsigned long *)loc - 1);
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temp = *(unsigned long *)loc;
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hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) |
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((temp_hi) & 0x7fff)) >> 1;
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offset = ((temp >> 16 & 0x03) << 15) |
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((temp & 0x7fff) >> 1);
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offset = (hi16_offset << 16) | (offset & 0xffff);
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uvalue = sym->st_value + offset;
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hi16_offset = (uvalue >> 16) << 1;
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temp_hi = ((temp_hi) & (~(0x37fff))) |
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(hi16_offset & 0x7fff) |
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((hi16_offset << 1) & 0x30000);
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*((unsigned long *)loc - 1) = temp_hi;
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offset = (uvalue & 0xffff) << 1;
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temp = (temp & (~(0x37fff))) | (offset & 0x7fff) |
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((offset << 1) & 0x30000);
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*(unsigned long *)loc = temp;
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break;
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}
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case R_SCORE_24: {
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unsigned long hi16_offset, offset;
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unsigned long uvalue;
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unsigned long temp;
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temp = *(unsigned long *)loc;
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offset = (temp & 0x03FF7FFE);
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hi16_offset = (offset & 0xFFFF0000);
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offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2;
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uvalue = (sym->st_value + offset) >> 1;
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uvalue = uvalue & 0x00ffffff;
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temp = (temp & 0xfc008001) |
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((uvalue << 2) & 0x3ff0000) |
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((uvalue & 0x3fff) << 1);
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*(unsigned long *)loc = temp;
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break;
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}
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default:
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printk(KERN_ERR "%s: unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel->r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec,
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struct module *me)
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{
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/* Non-standard return value... most other arch's return -ENOEXEC
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* for an unsupported relocation variant
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*/
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return 0;
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}
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/* Given an address, look for it in the module exception tables. */
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const struct exception_table_entry *search_module_dbetables(unsigned long addr)
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{
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return NULL;
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}
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