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/spinlock.h>
32 #include <linux/jump_label.h>
34 #include <asm/pgtable.h> /* MODULE_START */
37 struct mips_hi16 *next;
42 static struct mips_hi16 *mips_hi16_list;
44 static LIST_HEAD(dbe_list);
45 static DEFINE_SPINLOCK(dbe_lock);
48 void *module_alloc(unsigned long size)
50 return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END,
51 GFP_KERNEL, PAGE_KERNEL, -1,
52 __builtin_return_address(0));
56 static int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v)
61 static int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v)
68 static int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v)
75 static int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v)
78 pr_err("module %s: dangerous R_MIPS_26 REL relocation\n",
83 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
85 "module %s: relocation overflow\n",
90 *location = (*location & ~0x03ffffff) |
91 ((*location + (v >> 2)) & 0x03ffffff);
96 static int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v)
99 pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n",
104 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
106 "module %s: relocation overflow\n",
111 *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff);
116 static int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v)
121 * We cannot relocate this one now because we don't know the value of
122 * the carry we need to add. Save the information, and let LO16 do the
125 n = kmalloc(sizeof *n, GFP_KERNEL);
129 n->addr = (Elf_Addr *)location;
131 n->next = mips_hi16_list;
137 static int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v)
139 *location = (*location & 0xffff0000) |
140 ((((long long) v + 0x8000LL) >> 16) & 0xffff);
145 static int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v)
147 unsigned long insnlo = *location;
150 /* Sign extend the addend we extract from the lo insn. */
151 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
153 if (mips_hi16_list != NULL) {
158 struct mips_hi16 *next;
162 * The value for the HI16 had best be the same.
168 * Do the HI16 relocation. Note that we actually don't
169 * need to know anything about the LO16 itself, except
170 * where to find the low 16 bits of the addend needed
174 val = ((insn & 0xffff) << 16) + vallo;
178 * Account for the sign extension that will happen in
181 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
183 insn = (insn & ~0xffff) | val;
191 mips_hi16_list = NULL;
195 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
198 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
204 pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name);
209 static int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v)
211 *location = (*location & 0xffff0000) | (v & 0xffff);
216 static int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v)
218 *(Elf_Addr *)location = v;
223 static int apply_r_mips_higher_rela(struct module *me, u32 *location,
226 *location = (*location & 0xffff0000) |
227 ((((long long) v + 0x80008000LL) >> 32) & 0xffff);
232 static int apply_r_mips_highest_rela(struct module *me, u32 *location,
235 *location = (*location & 0xffff0000) |
236 ((((long long) v + 0x800080008000LL) >> 48) & 0xffff);
241 static int (*reloc_handlers_rel[]) (struct module *me, u32 *location,
243 [R_MIPS_NONE] = apply_r_mips_none,
244 [R_MIPS_32] = apply_r_mips_32_rel,
245 [R_MIPS_26] = apply_r_mips_26_rel,
246 [R_MIPS_HI16] = apply_r_mips_hi16_rel,
247 [R_MIPS_LO16] = apply_r_mips_lo16_rel
250 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
252 [R_MIPS_NONE] = apply_r_mips_none,
253 [R_MIPS_32] = apply_r_mips_32_rela,
254 [R_MIPS_26] = apply_r_mips_26_rela,
255 [R_MIPS_HI16] = apply_r_mips_hi16_rela,
256 [R_MIPS_LO16] = apply_r_mips_lo16_rela,
257 [R_MIPS_64] = apply_r_mips_64_rela,
258 [R_MIPS_HIGHER] = apply_r_mips_higher_rela,
259 [R_MIPS_HIGHEST] = apply_r_mips_highest_rela
262 int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
263 unsigned int symindex, unsigned int relsec,
266 Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr;
273 pr_debug("Applying relocate section %u to %u\n", relsec,
274 sechdrs[relsec].sh_info);
276 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
277 /* This is where to make the change */
278 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
280 /* This is the symbol it is referring to */
281 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
282 + ELF_MIPS_R_SYM(rel[i]);
283 if (IS_ERR_VALUE(sym->st_value)) {
284 /* Ignore unresolved weak symbol */
285 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
287 printk(KERN_WARNING "%s: Unknown symbol %s\n",
288 me->name, strtab + sym->st_name);
294 res = reloc_handlers_rel[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
302 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
303 unsigned int symindex, unsigned int relsec,
306 Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr;
313 pr_debug("Applying relocate section %u to %u\n", relsec,
314 sechdrs[relsec].sh_info);
316 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
317 /* This is where to make the change */
318 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
320 /* This is the symbol it is referring to */
321 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
322 + ELF_MIPS_R_SYM(rel[i]);
323 if (IS_ERR_VALUE(sym->st_value)) {
324 /* Ignore unresolved weak symbol */
325 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
327 printk(KERN_WARNING "%s: Unknown symbol %s\n",
328 me->name, strtab + sym->st_name);
332 v = sym->st_value + rel[i].r_addend;
334 res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v);
342 /* Given an address, look for it in the module exception tables. */
343 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
346 const struct exception_table_entry *e = NULL;
347 struct mod_arch_specific *dbe;
349 spin_lock_irqsave(&dbe_lock, flags);
350 list_for_each_entry(dbe, &dbe_list, dbe_list) {
351 e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr);
355 spin_unlock_irqrestore(&dbe_lock, flags);
357 /* Now, if we found one, we are running inside it now, hence
358 we cannot unload the module, hence no refcnt needed. */
362 /* Put in dbe list if necessary. */
363 int module_finalize(const Elf_Ehdr *hdr,
364 const Elf_Shdr *sechdrs,
368 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
370 /* Make jump label nops. */
371 jump_label_apply_nops(me);
373 INIT_LIST_HEAD(&me->arch.dbe_list);
374 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
375 if (strcmp("__dbe_table", secstrings + s->sh_name) != 0)
377 me->arch.dbe_start = (void *)s->sh_addr;
378 me->arch.dbe_end = (void *)s->sh_addr + s->sh_size;
379 spin_lock_irq(&dbe_lock);
380 list_add(&me->arch.dbe_list, &dbe_list);
381 spin_unlock_irq(&dbe_lock);
386 void module_arch_cleanup(struct module *mod)
388 spin_lock_irq(&dbe_lock);
389 list_del(&mod->arch.dbe_list);
390 spin_unlock_irq(&dbe_lock);