2012-08-14 17:13:45 +02:00
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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, 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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* Copyright (C) 2001 Rusty Russell.
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* Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2005 Thiemo Seufer
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2016-02-04 14:05:04 +01:00
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* Copyright (C) 2015 Imagination Technologies Ltd.
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2012-08-14 17:13:45 +02:00
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*/
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#include <linux/elf.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/moduleloader.h>
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extern int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v);
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static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = v;
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return 0;
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}
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static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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if (v % 4) {
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2016-02-04 14:05:03 +01:00
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pr_err("module %s: dangerous R_MIPS_26 RELA relocation\n",
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2012-08-14 17:13:45 +02:00
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me->name);
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return -ENOEXEC;
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}
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if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
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2016-02-04 14:05:03 +01:00
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pr_err("module %s: relocation overflow\n", me->name);
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2012-08-14 17:13:45 +02:00
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return -ENOEXEC;
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}
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*location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
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return 0;
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}
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static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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2013-01-22 12:59:30 +01:00
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((((long long) v + 0x8000LL) >> 16) & 0xffff);
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2012-08-14 17:13:45 +02:00
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return 0;
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}
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static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*location = (*location & 0xffff0000) | (v & 0xffff);
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return 0;
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}
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2016-02-04 14:05:04 +01:00
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static int apply_r_mips_pc_rela(struct module *me, u32 *location, Elf_Addr v,
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unsigned bits)
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{
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unsigned long mask = GENMASK(bits - 1, 0);
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unsigned long se_bits;
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long offset;
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if (v % 4) {
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pr_err("module %s: dangerous R_MIPS_PC%u RELA relocation\n",
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me->name, bits);
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return -ENOEXEC;
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}
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offset = ((long)v - (long)location) >> 2;
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/* check the sign bit onwards are identical - ie. we didn't overflow */
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se_bits = (offset & BIT(bits - 1)) ? ~0ul : 0;
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if ((offset & ~mask) != (se_bits & ~mask)) {
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pr_err("module %s: relocation overflow\n", me->name);
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return -ENOEXEC;
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}
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*location = (*location & ~mask) | (offset & mask);
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return 0;
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}
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static int apply_r_mips_pc16_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rela(me, location, v, 16);
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}
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static int apply_r_mips_pc21_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rela(me, location, v, 21);
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}
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static int apply_r_mips_pc26_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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return apply_r_mips_pc_rela(me, location, v, 26);
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}
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2012-08-14 17:13:45 +02:00
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static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
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{
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*(Elf_Addr *)location = v;
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return 0;
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}
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static int apply_r_mips_higher_rela(struct module *me, u32 *location,
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Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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2013-01-22 12:59:30 +01:00
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((((long long) v + 0x80008000LL) >> 32) & 0xffff);
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2012-08-14 17:13:45 +02:00
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return 0;
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}
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static int apply_r_mips_highest_rela(struct module *me, u32 *location,
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Elf_Addr v)
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{
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*location = (*location & 0xffff0000) |
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2013-01-22 12:59:30 +01:00
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((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
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2012-08-14 17:13:45 +02:00
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return 0;
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}
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static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
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Elf_Addr v) = {
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[R_MIPS_NONE] = apply_r_mips_none,
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[R_MIPS_32] = apply_r_mips_32_rela,
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[R_MIPS_26] = apply_r_mips_26_rela,
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[R_MIPS_HI16] = apply_r_mips_hi16_rela,
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[R_MIPS_LO16] = apply_r_mips_lo16_rela,
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2016-02-04 14:05:04 +01:00
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[R_MIPS_PC16] = apply_r_mips_pc16_rela,
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2012-08-14 17:13:45 +02:00
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[R_MIPS_64] = apply_r_mips_64_rela,
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[R_MIPS_HIGHER] = apply_r_mips_higher_rela,
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2016-02-04 14:05:04 +01:00
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[R_MIPS_HIGHEST] = apply_r_mips_highest_rela,
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[R_MIPS_PC21_S2] = apply_r_mips_pc21_rela,
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[R_MIPS_PC26_S2] = apply_r_mips_pc26_rela,
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2012-08-14 17:13:45 +02:00
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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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Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
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2016-02-04 14:05:02 +01:00
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int (*handler)(struct module *me, u32 *location, Elf_Addr v);
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2012-08-14 17:13:45 +02:00
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Elf_Sym *sym;
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u32 *location;
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2016-02-04 14:05:02 +01:00
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unsigned int i, type;
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2012-08-14 17:13:45 +02:00
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Elf_Addr v;
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int res;
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pr_debug("Applying relocate section %u to %u\n", relsec,
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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 it is referring to */
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sym = (Elf_Sym *)sechdrs[symindex].sh_addr
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+ ELF_MIPS_R_SYM(rel[i]);
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2016-02-15 15:35:20 +01:00
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if (sym->st_value >= -MAX_ERRNO) {
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2012-08-14 17:13:45 +02:00
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/* Ignore unresolved weak symbol */
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if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
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continue;
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2016-02-04 14:05:03 +01:00
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pr_warn("%s: Unknown symbol %s\n",
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2012-08-14 17:13:45 +02:00
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me->name, strtab + sym->st_name);
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return -ENOENT;
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}
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2016-02-04 14:05:02 +01:00
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type = ELF_MIPS_R_TYPE(rel[i]);
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if (type < ARRAY_SIZE(reloc_handlers_rela))
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handler = reloc_handlers_rela[type];
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else
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handler = NULL;
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2012-08-14 17:13:45 +02:00
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2016-02-04 14:05:02 +01:00
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if (!handler) {
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pr_err("%s: Unknown relocation type %u\n",
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me->name, type);
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return -EINVAL;
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}
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v = sym->st_value + rel[i].r_addend;
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res = handler(me, location, v);
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2012-08-14 17:13:45 +02:00
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if (res)
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return res;
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}
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return 0;
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}
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