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MIPS: module: Unify rel & rela reloc handling
The module load code has previously had entirely separate implementations for rel & rela style relocs, which unnecessarily duplicates a whole lot of code. Unify the implementations of both types of reloc, sharing the bulk of the code. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15832/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
Ralf Baechle
parent
351b0940d4
commit
430d0b8894
@ -47,8 +47,8 @@ typedef struct {
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#define Elf_Mips_Rel Elf32_Rel
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#define Elf_Mips_Rela Elf32_Rela
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#define ELF_MIPS_R_SYM(rel) ELF32_R_SYM(rel.r_info)
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#define ELF_MIPS_R_TYPE(rel) ELF32_R_TYPE(rel.r_info)
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#define ELF_MIPS_R_SYM(rel) ELF32_R_SYM((rel).r_info)
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#define ELF_MIPS_R_TYPE(rel) ELF32_R_TYPE((rel).r_info)
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#endif
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@ -65,8 +65,8 @@ typedef struct {
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#define Elf_Mips_Rel Elf64_Mips_Rel
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#define Elf_Mips_Rela Elf64_Mips_Rela
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#define ELF_MIPS_R_SYM(rel) (rel.r_sym)
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#define ELF_MIPS_R_TYPE(rel) (rel.r_type)
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#define ELF_MIPS_R_SYM(rel) ((rel).r_sym)
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#define ELF_MIPS_R_TYPE(rel) ((rel).r_type)
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#endif
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@ -31,7 +31,6 @@ obj-$(CONFIG_SYNC_R4K) += sync-r4k.o
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obj-$(CONFIG_DEBUG_FS) += segment.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_MODULES_USE_ELF_RELA) += module-rela.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
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@ -1,202 +0,0 @@
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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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* Copyright (C) 2015 Imagination Technologies Ltd.
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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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pr_err("module %s: dangerous R_MIPS_26 RELA relocation\n",
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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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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 & ~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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((((long long) v + 0x8000LL) >> 16) & 0xffff);
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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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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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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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((((long long) v + 0x80008000LL) >> 32) & 0xffff);
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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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((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
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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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[R_MIPS_PC16] = apply_r_mips_pc16_rela,
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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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[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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};
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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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int (*handler)(struct module *me, u32 *location, Elf_Addr v);
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Elf_Sym *sym;
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u32 *location;
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unsigned int i, type;
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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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if (sym->st_value >= -MAX_ERRNO) {
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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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pr_warn("%s: Unknown symbol %s\n",
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me->name, strtab + sym->st_name);
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return -ENOENT;
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}
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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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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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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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@ -53,22 +53,25 @@ void *module_alloc(unsigned long size)
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}
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#endif
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int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_none(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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return 0;
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}
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static int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_32(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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*location += v;
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*location = base + v;
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return 0;
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}
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static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_26(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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if (v % 4) {
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pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
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pr_err("module %s: dangerous R_MIPS_26 relocation\n",
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me->name);
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return -ENOEXEC;
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}
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@ -80,15 +83,22 @@ static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
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}
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*location = (*location & ~0x03ffffff) |
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((*location + (v >> 2)) & 0x03ffffff);
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((base + (v >> 2)) & 0x03ffffff);
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return 0;
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}
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static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_hi16(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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struct mips_hi16 *n;
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if (rela) {
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*location = (*location & 0xffff0000) |
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((((long long) v + 0x8000LL) >> 16) & 0xffff);
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return 0;
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}
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/*
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* We cannot relocate this one now because we don't know the value of
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* the carry we need to add. Save the information, and let LO16 do the
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@ -117,12 +127,18 @@ static void free_relocation_chain(struct mips_hi16 *l)
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}
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}
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static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_lo16(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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unsigned long insnlo = *location;
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unsigned long insnlo = base;
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struct mips_hi16 *l;
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Elf_Addr val, vallo;
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if (rela) {
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*location = (*location & 0xffff0000) | (v & 0xffff);
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return 0;
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}
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/* Sign extend the addend we extract from the lo insn. */
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vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
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@ -178,26 +194,26 @@ out_danger:
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free_relocation_chain(l);
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me->arch.r_mips_hi16_list = NULL;
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pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name);
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pr_err("module %s: dangerous R_MIPS_LO16 relocation\n", me->name);
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return -ENOEXEC;
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}
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static int apply_r_mips_pc_rel(struct module *me, u32 *location, Elf_Addr v,
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unsigned bits)
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static int apply_r_mips_pc(struct module *me, u32 *location, u32 base,
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Elf_Addr v, unsigned int 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 REL relocation\n",
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pr_err("module %s: dangerous R_MIPS_PC%u relocation\n",
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me->name, bits);
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return -ENOEXEC;
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}
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/* retrieve & sign extend implicit addend */
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offset = *location & mask;
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/* retrieve & sign extend implicit addend if any */
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offset = base & mask;
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offset |= (offset & BIT(bits - 1)) ? ~mask : 0;
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offset += ((long)v - (long)location) >> 2;
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@ -214,56 +230,121 @@ static int apply_r_mips_pc_rel(struct module *me, u32 *location, Elf_Addr v,
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return 0;
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}
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static int apply_r_mips_pc16_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_pc16(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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return apply_r_mips_pc_rel(me, location, v, 16);
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return apply_r_mips_pc(me, location, base, v, 16);
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}
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static int apply_r_mips_pc21_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_pc21(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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return apply_r_mips_pc_rel(me, location, v, 21);
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return apply_r_mips_pc(me, location, base, v, 21);
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}
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static int apply_r_mips_pc26_rel(struct module *me, u32 *location, Elf_Addr v)
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static int apply_r_mips_pc26(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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return apply_r_mips_pc_rel(me, location, v, 26);
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return apply_r_mips_pc(me, location, base, v, 26);
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}
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static int (*reloc_handlers_rel[]) (struct module *me, u32 *location,
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Elf_Addr v) = {
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static int apply_r_mips_64(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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if (WARN_ON(!rela))
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return -EINVAL;
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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(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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if (WARN_ON(!rela))
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return -EINVAL;
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*location = (*location & 0xffff0000) |
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((((long long)v + 0x80008000LL) >> 32) & 0xffff);
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return 0;
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}
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static int apply_r_mips_highest(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela)
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{
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if (WARN_ON(!rela))
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return -EINVAL;
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*location = (*location & 0xffff0000) |
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((((long long)v + 0x800080008000LL) >> 48) & 0xffff);
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return 0;
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}
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/**
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* reloc_handler() - Apply a particular relocation to a module
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* @me: the module to apply the reloc to
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* @location: the address at which the reloc is to be applied
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* @base: the existing value at location for REL-style; 0 for RELA-style
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* @v: the value of the reloc, with addend for RELA-style
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*
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* Each implemented reloc_handler function applies a particular type of
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* relocation to the module @me. Relocs that may be found in either REL or RELA
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* variants can be handled by making use of the @base & @v parameters which are
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* set to values which abstract the difference away from the particular reloc
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* implementations.
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*
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* Return: 0 upon success, else -ERRNO
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*/
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typedef int (*reloc_handler)(struct module *me, u32 *location,
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u32 base, Elf_Addr v, bool rela);
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/* The handlers for known reloc types */
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static reloc_handler reloc_handlers[] = {
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[R_MIPS_NONE] = apply_r_mips_none,
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[R_MIPS_32] = apply_r_mips_32_rel,
|
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[R_MIPS_26] = apply_r_mips_26_rel,
|
||||
[R_MIPS_HI16] = apply_r_mips_hi16_rel,
|
||||
[R_MIPS_LO16] = apply_r_mips_lo16_rel,
|
||||
[R_MIPS_PC16] = apply_r_mips_pc16_rel,
|
||||
[R_MIPS_PC21_S2] = apply_r_mips_pc21_rel,
|
||||
[R_MIPS_PC26_S2] = apply_r_mips_pc26_rel,
|
||||
[R_MIPS_32] = apply_r_mips_32,
|
||||
[R_MIPS_26] = apply_r_mips_26,
|
||||
[R_MIPS_HI16] = apply_r_mips_hi16,
|
||||
[R_MIPS_LO16] = apply_r_mips_lo16,
|
||||
[R_MIPS_PC16] = apply_r_mips_pc16,
|
||||
[R_MIPS_64] = apply_r_mips_64,
|
||||
[R_MIPS_HIGHER] = apply_r_mips_higher,
|
||||
[R_MIPS_HIGHEST] = apply_r_mips_highest,
|
||||
[R_MIPS_PC21_S2] = apply_r_mips_pc21,
|
||||
[R_MIPS_PC26_S2] = apply_r_mips_pc26,
|
||||
};
|
||||
|
||||
int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int symindex, unsigned int relsec,
|
||||
struct module *me)
|
||||
static int __apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int symindex, unsigned int relsec,
|
||||
struct module *me, bool rela)
|
||||
{
|
||||
Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr;
|
||||
int (*handler)(struct module *me, u32 *location, Elf_Addr v);
|
||||
union {
|
||||
Elf_Mips_Rel *rel;
|
||||
Elf_Mips_Rela *rela;
|
||||
} r;
|
||||
reloc_handler handler;
|
||||
Elf_Sym *sym;
|
||||
u32 *location;
|
||||
u32 *location, base;
|
||||
unsigned int i, type;
|
||||
Elf_Addr v;
|
||||
int err = 0;
|
||||
size_t reloc_sz;
|
||||
|
||||
pr_debug("Applying relocate section %u to %u\n", relsec,
|
||||
sechdrs[relsec].sh_info);
|
||||
|
||||
r.rel = (void *)sechdrs[relsec].sh_addr;
|
||||
reloc_sz = rela ? sizeof(*r.rela) : sizeof(*r.rel);
|
||||
me->arch.r_mips_hi16_list = NULL;
|
||||
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
|
||||
for (i = 0; i < sechdrs[relsec].sh_size / reloc_sz; i++) {
|
||||
/* This is where to make the change */
|
||||
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
|
||||
+ rel[i].r_offset;
|
||||
+ r.rel->r_offset;
|
||||
/* This is the symbol it is referring to */
|
||||
sym = (Elf_Sym *)sechdrs[symindex].sh_addr
|
||||
+ ELF_MIPS_R_SYM(rel[i]);
|
||||
+ ELF_MIPS_R_SYM(*r.rel);
|
||||
if (sym->st_value >= -MAX_ERRNO) {
|
||||
/* Ignore unresolved weak symbol */
|
||||
if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
|
||||
@ -274,10 +355,9 @@ int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
||||
goto out;
|
||||
}
|
||||
|
||||
type = ELF_MIPS_R_TYPE(rel[i]);
|
||||
|
||||
if (type < ARRAY_SIZE(reloc_handlers_rel))
|
||||
handler = reloc_handlers_rel[type];
|
||||
type = ELF_MIPS_R_TYPE(*r.rel);
|
||||
if (type < ARRAY_SIZE(reloc_handlers))
|
||||
handler = reloc_handlers[type];
|
||||
else
|
||||
handler = NULL;
|
||||
|
||||
@ -288,8 +368,17 @@ int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
||||
goto out;
|
||||
}
|
||||
|
||||
v = sym->st_value;
|
||||
err = handler(me, location, v);
|
||||
if (rela) {
|
||||
v = sym->st_value + r.rela->r_addend;
|
||||
base = 0;
|
||||
r.rela = &r.rela[1];
|
||||
} else {
|
||||
v = sym->st_value;
|
||||
base = *location;
|
||||
r.rel = &r.rel[1];
|
||||
}
|
||||
|
||||
err = handler(me, location, base, v, rela);
|
||||
if (err)
|
||||
goto out;
|
||||
}
|
||||
@ -312,6 +401,22 @@ out:
|
||||
return err;
|
||||
}
|
||||
|
||||
int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int symindex, unsigned int relsec,
|
||||
struct module *me)
|
||||
{
|
||||
return __apply_relocate(sechdrs, strtab, symindex, relsec, me, false);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_MODULES_USE_ELF_RELA
|
||||
int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
|
||||
unsigned int symindex, unsigned int relsec,
|
||||
struct module *me)
|
||||
{
|
||||
return __apply_relocate(sechdrs, strtab, symindex, relsec, me, true);
|
||||
}
|
||||
#endif /* CONFIG_MODULES_USE_ELF_RELA */
|
||||
|
||||
/* Given an address, look for it in the module exception tables. */
|
||||
const struct exception_table_entry *search_module_dbetables(unsigned long addr)
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user