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![Jonas Bonn](/assets/img/avatar_default.png)
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>
156 lines
4.2 KiB
C
156 lines
4.2 KiB
C
/* MN10300 Kernel module helper routines
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*
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* Copyright (C) 2007, 2008, 2009 Red Hat, Inc. All Rights Reserved.
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* Written by Mark Salter (msalter@redhat.com)
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* - Derived from arch/i386/kernel/module.c
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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 Licence as published by
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* the Free Software Foundation; either version 2 of the Licence, 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 Licence for more details.
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*
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* You should have received a copy of the GNU General Public Licence
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/bug.h>
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#if 0
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt, ...)
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#endif
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static void reloc_put16(uint8_t *p, uint32_t val)
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{
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p[0] = val & 0xff;
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p[1] = (val >> 8) & 0xff;
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}
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static void reloc_put24(uint8_t *p, uint32_t val)
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{
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reloc_put16(p, val);
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p[2] = (val >> 16) & 0xff;
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}
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static void reloc_put32(uint8_t *p, uint32_t val)
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{
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reloc_put16(p, val);
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reloc_put16(p+2, val >> 16);
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}
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/*
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* apply a RELA relocation
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*/
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int apply_relocate_add(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i, sym_diff_seen = 0;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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Elf32_Addr relocation, sym_diff_val = 0;
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uint8_t *location;
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uint32_t value;
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DEBUGP("Applying relocate section %u to %u\n",
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relsec, sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* this is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* this is the symbol the relocation is referring to (note that
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* all undefined symbols have been resolved by the caller) */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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/* this is the adjustment to be made */
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relocation = sym->st_value + rel[i].r_addend;
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if (sym_diff_seen) {
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_MN10300_32:
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case R_MN10300_24:
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case R_MN10300_16:
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case R_MN10300_8:
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relocation -= sym_diff_val;
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sym_diff_seen = 0;
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break;
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default:
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printk(KERN_ERR "module %s: Unexpected SYM_DIFF relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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/* for the first four relocation types, we simply
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* store the adjustment at the location given */
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case R_MN10300_32:
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reloc_put32(location, relocation);
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break;
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case R_MN10300_24:
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reloc_put24(location, relocation);
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break;
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case R_MN10300_16:
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reloc_put16(location, relocation);
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break;
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case R_MN10300_8:
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*location = relocation;
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break;
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/* for the next three relocation types, we write the
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* adjustment with the address subtracted over the
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* value at the location given */
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case R_MN10300_PCREL32:
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value = relocation - (uint32_t) location;
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reloc_put32(location, value);
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break;
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case R_MN10300_PCREL16:
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value = relocation - (uint32_t) location;
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reloc_put16(location, value);
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break;
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case R_MN10300_PCREL8:
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*location = relocation - (uint32_t) location;
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break;
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case R_MN10300_SYM_DIFF:
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/* This is used to adjust the next reloc as required
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* by relaxation. */
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sym_diff_seen = 1;
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sym_diff_val = sym->st_value;
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break;
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case R_MN10300_ALIGN:
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/* Just ignore the ALIGN relocs.
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* Only interesting if kernel performed relaxation. */
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continue;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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if (sym_diff_seen) {
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printk(KERN_ERR "module %s: Nothing follows SYM_DIFF relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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return 0;
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}
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