2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
16 * Copyright (C) 2001 Rusty Russell.
17 * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
18 * Copyright (C) 2005 Thiemo Seufer
23 #include <linux/moduleloader.h>
24 #include <linux/elf.h>
26 #include <linux/vmalloc.h>
27 #include <linux/slab.h>
29 #include <linux/string.h>
30 #include <linux/kernel.h>
31 #include <linux/module.h>
32 #include <linux/spinlock.h>
33 #include <linux/jump_label.h>
35 #include <asm/pgtable.h> /* MODULE_START */
38 struct mips_hi16 *next;
43 static struct mips_hi16 *mips_hi16_list;
45 static LIST_HEAD(dbe_list);
46 static DEFINE_SPINLOCK(dbe_lock);
48 void *module_alloc(unsigned long size)
51 return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
52 GFP_KERNEL, PAGE_KERNEL, -1,
53 __builtin_return_address(0));
61 /* Free memory returned from module_alloc */
62 void module_free(struct module *mod, void *module_region)
67 int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
68 char *secstrings, struct module *mod)
73 static int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
78 static int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v)
85 static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
92 static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
95 pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
100 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
102 "module %s: relocation overflow\n",
107 *location = (*location & ~0x03ffffff) |
108 ((*location + (v >> 2)) & 0x03ffffff);
113 static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
116 pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
121 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
123 "module %s: relocation overflow\n",
128 *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
133 static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
138 * We cannot relocate this one now because we don't know the value of
139 * the carry we need to add. Save the information, and let LO16 do the
142 n = kmalloc(sizeof *n, GFP_KERNEL);
146 n->addr = (Elf_Addr *)location;
148 n->next = mips_hi16_list;
154 static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
156 *location = (*location & 0xffff0000) |
157 ((((long long) v + 0x8000LL) >> 16) & 0xffff);
162 static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
164 unsigned long insnlo = *location;
167 /* Sign extend the addend we extract from the lo insn. */
168 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
170 if (mips_hi16_list != NULL) {
175 struct mips_hi16 *next;
179 * The value for the HI16 had best be the same.
185 * Do the HI16 relocation. Note that we actually don't
186 * need to know anything about the LO16 itself, except
187 * where to find the low 16 bits of the addend needed
191 val = ((insn & 0xffff) << 16) + vallo;
195 * Account for the sign extension that will happen in
198 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
200 insn = (insn & ~0xffff) | val;
208 mips_hi16_list = NULL;
212 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
215 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
221 pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name);
226 static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
228 *location = (*location & 0xffff0000) | (v & 0xffff);
233 static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
235 *(Elf_Addr *)location = v;
240 static int apply_r_mips_higher_rela(struct module *me, u32 *location,
243 *location = (*location & 0xffff0000) |
244 ((((long long) v + 0x80008000LL) >> 32) & 0xffff);
249 static int apply_r_mips_highest_rela(struct module *me, u32 *location,
252 *location = (*location & 0xffff0000) |
253 ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
258 static int (*reloc_handlers_rel[]) (struct module *me, u32 *location,
260 [R_MIPS_NONE] = apply_r_mips_none,
261 [R_MIPS_32] = apply_r_mips_32_rel,
262 [R_MIPS_26] = apply_r_mips_26_rel,
263 [R_MIPS_HI16] = apply_r_mips_hi16_rel,
264 [R_MIPS_LO16] = apply_r_mips_lo16_rel
267 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
269 [R_MIPS_NONE] = apply_r_mips_none,
270 [R_MIPS_32] = apply_r_mips_32_rela,
271 [R_MIPS_26] = apply_r_mips_26_rela,
272 [R_MIPS_HI16] = apply_r_mips_hi16_rela,
273 [R_MIPS_LO16] = apply_r_mips_lo16_rela,
274 [R_MIPS_64] = apply_r_mips_64_rela,
275 [R_MIPS_HIGHER] = apply_r_mips_higher_rela,
276 [R_MIPS_HIGHEST] = apply_r_mips_highest_rela
279 int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
280 unsigned int symindex, unsigned int relsec,
283 Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr;
290 pr_debug("Applying relocate section %u to %u\n", relsec,
291 sechdrs[relsec].sh_info);
293 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
294 /* This is where to make the change */
295 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
297 /* This is the symbol it is referring to */
298 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
299 + ELF_MIPS_R_SYM(rel[i]);
300 if (IS_ERR_VALUE(sym->st_value)) {
301 /* Ignore unresolved weak symbol */
302 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
304 printk(KERN_WARNING "%s: Unknown symbol %s\n",
305 me->name, strtab + sym->st_name);
311 res = reloc_handlers_rel[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
319 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
320 unsigned int symindex, unsigned int relsec,
323 Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
330 pr_debug("Applying relocate section %u to %u\n", relsec,
331 sechdrs[relsec].sh_info);
333 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
334 /* This is where to make the change */
335 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
337 /* This is the symbol it is referring to */
338 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
339 + ELF_MIPS_R_SYM(rel[i]);
340 if (IS_ERR_VALUE(sym->st_value)) {
341 /* Ignore unresolved weak symbol */
342 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
344 printk(KERN_WARNING "%s: Unknown symbol %s\n",
345 me->name, strtab + sym->st_name);
349 v = sym->st_value + rel[i].r_addend;
351 res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
359 /* Given an address, look for it in the module exception tables. */
360 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
363 const struct exception_table_entry *e = NULL;
364 struct mod_arch_specific *dbe;
366 spin_lock_irqsave(&dbe_lock, flags);
367 list_for_each_entry(dbe, &dbe_list, dbe_list) {
368 e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr);
372 spin_unlock_irqrestore(&dbe_lock, flags);
374 /* Now, if we found one, we are running inside it now, hence
375 we cannot unload the module, hence no refcnt needed. */
379 /* Put in dbe list if necessary. */
380 int module_finalize(const Elf_Ehdr *hdr,
381 const Elf_Shdr *sechdrs,
385 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
387 /* Make jump label nops. */
388 jump_label_apply_nops(me);
390 INIT_LIST_HEAD(&me->arch.dbe_list);
391 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
392 if (strcmp("__dbe_table", secstrings + s->sh_name) != 0)
394 me->arch.dbe_start = (void *)s->sh_addr;
395 me->arch.dbe_end = (void *)s->sh_addr + s->sh_size;
396 spin_lock_irq(&dbe_lock);
397 list_add(&me->arch.dbe_list, &dbe_list);
398 spin_unlock_irq(&dbe_lock);
403 void module_arch_cleanup(struct module *mod)
405 spin_lock_irq(&dbe_lock);
406 list_del(&mod->arch.dbe_list);
407 spin_unlock_irq(&dbe_lock);