diff options
Diffstat (limited to 'arch/mips/kernel/module-elf32.c')
| -rw-r--r-- | arch/mips/kernel/module-elf32.c | 250 |
1 files changed, 0 insertions, 250 deletions
diff --git a/arch/mips/kernel/module-elf32.c b/arch/mips/kernel/module-elf32.c deleted file mode 100644 index ffd216d6d6dc..000000000000 --- a/arch/mips/kernel/module-elf32.c +++ /dev/null @@ -1,250 +0,0 @@ -/* - * 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, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Copyright (C) 2001 Rusty Russell. - * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org) - */ - -#undef DEBUG - -#include <linux/moduleloader.h> -#include <linux/elf.h> -#include <linux/vmalloc.h> -#include <linux/slab.h> -#include <linux/fs.h> -#include <linux/string.h> -#include <linux/kernel.h> - -struct mips_hi16 { - struct mips_hi16 *next; - Elf32_Addr *addr; - Elf32_Addr value; -}; - -static struct mips_hi16 *mips_hi16_list; - -void *module_alloc(unsigned long size) -{ - if (size == 0) - return NULL; - return vmalloc(size); -} - - -/* Free memory returned from module_alloc */ -void module_free(struct module *mod, void *module_region) -{ - vfree(module_region); - /* FIXME: If module_region == mod->init_region, trim exception - table entries. */ -} - -int module_frob_arch_sections(Elf_Ehdr *hdr, - Elf_Shdr *sechdrs, - char *secstrings, - struct module *mod) -{ - return 0; -} - -static int apply_r_mips_none(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - return 0; -} - -static int apply_r_mips_32(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - *location += v; - - return 0; -} - -static int apply_r_mips_26(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - if (v % 4) { - printk(KERN_ERR "module %s: dangerous relocation\n", me->name); - return -ENOEXEC; - } - - if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { - printk(KERN_ERR - "module %s: relocation overflow\n", - me->name); - return -ENOEXEC; - } - - *location = (*location & ~0x03ffffff) | - ((*location + (v >> 2)) & 0x03ffffff); - - return 0; -} - -static int apply_r_mips_hi16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - struct mips_hi16 *n; - - /* - * We cannot relocate this one now because we don't know the value of - * the carry we need to add. Save the information, and let LO16 do the - * actual relocation. - */ - n = kmalloc(sizeof *n, GFP_KERNEL); - if (!n) - return -ENOMEM; - - n->addr = location; - n->value = v; - n->next = mips_hi16_list; - mips_hi16_list = n; - - return 0; -} - -static int apply_r_mips_lo16(struct module *me, uint32_t *location, - Elf32_Addr v) -{ - unsigned long insnlo = *location; - Elf32_Addr val, vallo; - - /* Sign extend the addend we extract from the lo insn. */ - vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; - - if (mips_hi16_list != NULL) { - struct mips_hi16 *l; - - l = mips_hi16_list; - while (l != NULL) { - struct mips_hi16 *next; - unsigned long insn; - - /* - * The value for the HI16 had best be the same. - */ - if (v != l->value) - goto out_danger; - - /* - * Do the HI16 relocation. Note that we actually don't - * need to know anything about the LO16 itself, except - * where to find the low 16 bits of the addend needed - * by the LO16. - */ - insn = *l->addr; - val = ((insn & 0xffff) << 16) + vallo; - val += v; - - /* - * Account for the sign extension that will happen in - * the low bits. - */ - val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; - - insn = (insn & ~0xffff) | val; - *l->addr = insn; - - next = l->next; - kfree(l); - l = next; - } - - mips_hi16_list = NULL; - } - - /* - * Ok, we're done with the HI16 relocs. Now deal with the LO16. - */ - val = v + vallo; - insnlo = (insnlo & ~0xffff) | (val & 0xffff); - *location = insnlo; - - return 0; - -out_danger: - printk(KERN_ERR "module %s: dangerous " "relocation\n", me->name); - - return -ENOEXEC; -} - -static int (*reloc_handlers[]) (struct module *me, uint32_t *location, - Elf32_Addr v) = { - [R_MIPS_NONE] = apply_r_mips_none, - [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 -}; - -int apply_relocate(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *me) -{ - Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; - Elf32_Sym *sym; - uint32_t *location; - unsigned int i; - Elf32_Addr v; - int res; - - pr_debug("Applying relocate section %u to %u\n", relsec, - sechdrs[relsec].sh_info); - - for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { - Elf32_Word r_info = rel[i].r_info; - - /* This is where to make the change */ - location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr - + rel[i].r_offset; - /* This is the symbol it is referring to */ - sym = (Elf32_Sym *)sechdrs[symindex].sh_addr - + ELF32_R_SYM(r_info); - if (!sym->st_value) { - printk(KERN_WARNING "%s: Unknown symbol %s\n", - me->name, strtab + sym->st_name); - return -ENOENT; - } - - v = sym->st_value; - - res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); - if (res) - return res; - } - - return 0; -} - -int apply_relocate_add(Elf32_Shdr *sechdrs, - const char *strtab, - unsigned int symindex, - unsigned int relsec, - struct module *me) -{ - /* - * Current binutils always generate .rela relocations. Keep smiling - * if it's empty, abort otherwise. - */ - if (!sechdrs[relsec].sh_size) - return 0; - - printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", - me->name); - return -ENOEXEC; -} |