1 /* Kernel dynamically loadable module help for PARISC.
3 * The best reference for this stuff is probably the Processor-
4 * Specific ELF Supplement for PA-RISC:
5 * http://ftp.parisc-linux.org/docs/arch/elf-pa-hp.pdf
7 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
8 * Copyright (C) 2003 Randolph Chung <tausq at debian . org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * We are not doing SEGREL32 handling correctly. According to the ABI, we
29 * should do a value offset, like this:
30 * if (is_init(me, (void *)val))
31 * val -= (uint32_t)me->module_init;
33 * val -= (uint32_t)me->module_core;
34 * However, SEGREL32 is used only for PARISC unwind entries, and we want
35 * those entries to have an absolute address, and not just an offset.
37 * The unwind table mechanism has the ability to specify an offset for
38 * the unwind table; however, because we split off the init functions into
39 * a different piece of memory, it is not possible to do this using a
40 * single offset. Instead, we use the above hack for now.
43 #include <linux/moduleloader.h>
44 #include <linux/elf.h>
45 #include <linux/vmalloc.h>
47 #include <linux/string.h>
48 #include <linux/kernel.h>
50 #include <asm/unwind.h>
55 #define DEBUGP(fmt...)
58 #define CHECK_RELOC(val, bits) \
59 if ( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
60 ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) { \
61 printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
62 me->name, strtab + sym->st_name, (unsigned long)val, bits); \
66 /* Maximum number of GOT entries. We use a long displacement ldd from
67 * the bottom of the table, which has a maximum signed displacement of
68 * 0x3fff; however, since we're only going forward, this becomes
69 * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
70 * at most 1023 entries */
73 /* three functions to determine where in the module core
74 * or init pieces the location is */
75 static inline int is_init(struct module *me, void *loc)
77 return (loc >= me->module_init &&
78 loc <= (me->module_init + me->init_size));
81 static inline int is_core(struct module *me, void *loc)
83 return (loc >= me->module_core &&
84 loc <= (me->module_core + me->core_size));
87 static inline int is_local(struct module *me, void *loc)
89 return is_init(me, loc) || is_core(me, loc);
92 static inline int is_local_section(struct module *me, void *loc, void *dot)
94 return (is_init(me, loc) && is_init(me, dot)) ||
95 (is_core(me, loc) && is_core(me, dot));
104 #define Elf_Fdesc Elf32_Fdesc
107 Elf32_Word insns[2]; /* each stub entry has two insns */
114 #define Elf_Fdesc Elf64_Fdesc
117 Elf64_Word insns[4]; /* each stub entry has four insns */
121 /* Field selection types defined by hppa */
122 #define rnd(x) (((x)+0x1000)&~0x1fff)
123 /* fsel: full 32 bits */
124 #define fsel(v,a) ((v)+(a))
125 /* lsel: select left 21 bits */
126 #define lsel(v,a) (((v)+(a))>>11)
127 /* rsel: select right 11 bits */
128 #define rsel(v,a) (((v)+(a))&0x7ff)
129 /* lrsel with rounding of addend to nearest 8k */
130 #define lrsel(v,a) (((v)+rnd(a))>>11)
131 /* rrsel with rounding of addend to nearest 8k */
132 #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
134 #define mask(x,sz) ((x) & ~((1<<(sz))-1))
137 /* The reassemble_* functions prepare an immediate value for
138 insertion into an opcode. pa-risc uses all sorts of weird bitfields
139 in the instruction to hold the value. */
140 static inline int reassemble_14(int as14)
142 return (((as14 & 0x1fff) << 1) |
143 ((as14 & 0x2000) >> 13));
146 static inline int reassemble_17(int as17)
148 return (((as17 & 0x10000) >> 16) |
149 ((as17 & 0x0f800) << 5) |
150 ((as17 & 0x00400) >> 8) |
151 ((as17 & 0x003ff) << 3));
154 static inline int reassemble_21(int as21)
156 return (((as21 & 0x100000) >> 20) |
157 ((as21 & 0x0ffe00) >> 8) |
158 ((as21 & 0x000180) << 7) |
159 ((as21 & 0x00007c) << 14) |
160 ((as21 & 0x000003) << 12));
163 static inline int reassemble_22(int as22)
165 return (((as22 & 0x200000) >> 21) |
166 ((as22 & 0x1f0000) << 5) |
167 ((as22 & 0x00f800) << 5) |
168 ((as22 & 0x000400) >> 8) |
169 ((as22 & 0x0003ff) << 3));
172 void *module_alloc(unsigned long size)
176 return vmalloc(size);
180 static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
185 static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
190 static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
192 unsigned long cnt = 0;
194 for (; n > 0; n--, rela++)
196 switch (ELF32_R_TYPE(rela->r_info)) {
197 case R_PARISC_PCREL17F:
198 case R_PARISC_PCREL22F:
206 static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
208 unsigned long cnt = 0;
210 for (; n > 0; n--, rela++)
212 switch (ELF64_R_TYPE(rela->r_info)) {
213 case R_PARISC_LTOFF21L:
214 case R_PARISC_LTOFF14R:
215 case R_PARISC_PCREL22F:
223 static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
225 unsigned long cnt = 0;
227 for (; n > 0; n--, rela++)
229 switch (ELF64_R_TYPE(rela->r_info)) {
230 case R_PARISC_FPTR64:
238 static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
240 unsigned long cnt = 0;
242 for (; n > 0; n--, rela++)
244 switch (ELF64_R_TYPE(rela->r_info)) {
245 case R_PARISC_PCREL22F:
255 /* Free memory returned from module_alloc */
256 void module_free(struct module *mod, void *module_region)
258 vfree(module_region);
259 /* FIXME: If module_region == mod->init_region, trim exception
264 int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
265 CONST Elf_Shdr *sechdrs,
266 CONST char *secstrings,
269 unsigned long gots = 0, fdescs = 0, stubs = 0, init_stubs = 0;
272 for (i = 1; i < hdr->e_shnum; i++) {
273 const Elf_Rela *rels = (void *)hdr + sechdrs[i].sh_offset;
274 unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
276 if (strncmp(secstrings + sechdrs[i].sh_name,
277 ".PARISC.unwind", 14) == 0)
278 me->arch.unwind_section = i;
280 if (sechdrs[i].sh_type != SHT_RELA)
283 /* some of these are not relevant for 32-bit/64-bit
284 * we leave them here to make the code common. the
285 * compiler will do its thing and optimize out the
286 * stuff we don't need
288 gots += count_gots(rels, nrels);
289 fdescs += count_fdescs(rels, nrels);
290 if(strncmp(secstrings + sechdrs[i].sh_name,
291 ".rela.init", 10) == 0)
292 init_stubs += count_stubs(rels, nrels);
294 stubs += count_stubs(rels, nrels);
297 /* align things a bit */
298 me->core_size = ALIGN(me->core_size, 16);
299 me->arch.got_offset = me->core_size;
300 me->core_size += gots * sizeof(struct got_entry);
302 me->core_size = ALIGN(me->core_size, 16);
303 me->arch.fdesc_offset = me->core_size;
304 me->core_size += fdescs * sizeof(Elf_Fdesc);
306 me->core_size = ALIGN(me->core_size, 16);
307 me->arch.stub_offset = me->core_size;
308 me->core_size += stubs * sizeof(struct stub_entry);
310 me->init_size = ALIGN(me->init_size, 16);
311 me->arch.init_stub_offset = me->init_size;
312 me->init_size += init_stubs * sizeof(struct stub_entry);
314 me->arch.got_max = gots;
315 me->arch.fdesc_max = fdescs;
316 me->arch.stub_max = stubs;
317 me->arch.init_stub_max = init_stubs;
323 static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
326 struct got_entry *got;
332 got = me->module_core + me->arch.got_offset;
333 for (i = 0; got[i].addr; i++)
334 if (got[i].addr == value)
337 BUG_ON(++me->arch.got_count > me->arch.got_max);
341 DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry),
343 return i * sizeof(struct got_entry);
345 #endif /* __LP64__ */
348 static Elf_Addr get_fdesc(struct module *me, unsigned long value)
350 Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset;
353 printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
357 /* Look for existing fdesc entry. */
358 while (fdesc->addr) {
359 if (fdesc->addr == value)
360 return (Elf_Addr)fdesc;
364 BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
368 fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
369 return (Elf_Addr)fdesc;
371 #endif /* __LP64__ */
379 static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
380 enum elf_stub_type stub_type, int init_section)
383 struct stub_entry *stub;
386 i = me->arch.init_stub_count++;
387 BUG_ON(me->arch.init_stub_count > me->arch.init_stub_max);
388 stub = me->module_init + me->arch.init_stub_offset +
389 i * sizeof(struct stub_entry);
391 i = me->arch.stub_count++;
392 BUG_ON(me->arch.stub_count > me->arch.stub_max);
393 stub = me->module_core + me->arch.stub_offset +
394 i * sizeof(struct stub_entry);
398 /* for 32-bit the stub looks like this:
400 * be,n R'XXX(%sr4,%r1)
402 //value = *(unsigned long *)((value + addend) & ~3); /* why? */
404 stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */
405 stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */
407 stub->insns[0] |= reassemble_21(lrsel(value, addend));
408 stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
411 /* for 64-bit we have three kinds of stubs:
412 * for normal function calls:
424 * for direct branches (jumps between different section of the
432 stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */
433 stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */
434 stub->insns[2] = 0xe820d000; /* bve (%r1) */
435 stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */
437 stub->insns[0] |= reassemble_14(get_got(me, value, addend) & 0x3fff);
440 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
441 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
442 stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */
443 stub->insns[3] = 0xe820d002; /* bve,n (%r1) */
445 stub->insns[0] |= reassemble_21(lrsel(value, addend));
446 stub->insns[1] |= reassemble_14(rrsel(value, addend));
448 case ELF_STUB_DIRECT:
449 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
450 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
451 stub->insns[2] = 0xe820d002; /* bve,n (%r1) */
453 stub->insns[0] |= reassemble_21(lrsel(value, addend));
454 stub->insns[1] |= reassemble_14(rrsel(value, addend));
460 return (Elf_Addr)stub;
463 int apply_relocate(Elf_Shdr *sechdrs,
465 unsigned int symindex,
469 /* parisc should not need this ... */
470 printk(KERN_ERR "module %s: RELOCATION unsupported\n",
476 int apply_relocate_add(Elf_Shdr *sechdrs,
478 unsigned int symindex,
483 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
489 //unsigned long dp = (unsigned long)$global$;
490 register unsigned long dp asm ("r27");
492 DEBUGP("Applying relocate section %u to %u\n", relsec,
493 sechdrs[relsec].sh_info);
494 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
495 /* This is where to make the change */
496 loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
498 /* This is the symbol it is referring to */
499 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
500 + ELF32_R_SYM(rel[i].r_info);
501 if (!sym->st_value) {
502 printk(KERN_WARNING "%s: Unknown symbol %s\n",
503 me->name, strtab + sym->st_name);
506 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
507 dot = (Elf32_Addr)loc & ~0x03;
510 addend = rel[i].r_addend;
513 #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
514 DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
515 strtab + sym->st_name,
516 (uint32_t)loc, val, addend,
530 switch (ELF32_R_TYPE(rel[i].r_info)) {
531 case R_PARISC_PLABEL32:
532 /* 32-bit function address */
533 /* no function descriptors... */
534 *loc = fsel(val, addend);
537 /* direct 32-bit ref */
538 *loc = fsel(val, addend);
540 case R_PARISC_DIR21L:
541 /* left 21 bits of effective address */
542 val = lrsel(val, addend);
543 *loc = mask(*loc, 21) | reassemble_21(val);
545 case R_PARISC_DIR14R:
546 /* right 14 bits of effective address */
547 val = rrsel(val, addend);
548 *loc = mask(*loc, 14) | reassemble_14(val);
550 case R_PARISC_SEGREL32:
551 /* 32-bit segment relative address */
552 /* See note about special handling of SEGREL32 at
553 * the beginning of this file.
555 *loc = fsel(val, addend);
557 case R_PARISC_DPREL21L:
558 /* left 21 bit of relative address */
559 val = lrsel(val - dp, addend);
560 *loc = mask(*loc, 21) | reassemble_21(val);
562 case R_PARISC_DPREL14R:
563 /* right 14 bit of relative address */
564 val = rrsel(val - dp, addend);
565 *loc = mask(*loc, 14) | reassemble_14(val);
567 case R_PARISC_PCREL17F:
568 /* 17-bit PC relative address */
569 val = get_stub(me, val, addend, ELF_STUB_GOT, is_init(me, loc));
570 val = (val - dot - 8)/4;
572 *loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
574 case R_PARISC_PCREL22F:
575 /* 22-bit PC relative address; only defined for pa20 */
576 val = get_stub(me, val, addend, ELF_STUB_GOT, is_init(me, loc));
577 DEBUGP("STUB FOR %s loc %lx+%lx at %lx\n",
578 strtab + sym->st_name, (unsigned long)loc, addend,
580 val = (val - dot - 8)/4;
581 CHECK_RELOC(val, 22);
582 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
586 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
587 me->name, ELF32_R_TYPE(rel[i].r_info));
596 int apply_relocate_add(Elf_Shdr *sechdrs,
598 unsigned int symindex,
603 Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
611 DEBUGP("Applying relocate section %u to %u\n", relsec,
612 sechdrs[relsec].sh_info);
613 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
614 /* This is where to make the change */
615 loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
617 /* This is the symbol it is referring to */
618 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
619 + ELF64_R_SYM(rel[i].r_info);
620 if (!sym->st_value) {
621 printk(KERN_WARNING "%s: Unknown symbol %s\n",
622 me->name, strtab + sym->st_name);
625 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
626 dot = (Elf64_Addr)loc & ~0x03;
627 loc64 = (Elf64_Xword *)loc;
630 addend = rel[i].r_addend;
633 #define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t :
634 printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n",
635 strtab + sym->st_name,
647 switch (ELF64_R_TYPE(rel[i].r_info)) {
648 case R_PARISC_LTOFF21L:
649 /* LT-relative; left 21 bits */
650 val = get_got(me, val, addend);
651 DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n",
652 strtab + sym->st_name,
655 *loc = mask(*loc, 21) | reassemble_21(val);
657 case R_PARISC_LTOFF14R:
658 /* L(ltoff(val+addend)) */
659 /* LT-relative; right 14 bits */
660 val = get_got(me, val, addend);
662 DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n",
663 strtab + sym->st_name,
665 *loc = mask(*loc, 14) | reassemble_14(val);
667 case R_PARISC_PCREL22F:
668 /* PC-relative; 22 bits */
669 DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
670 strtab + sym->st_name,
672 /* can we reach it locally? */
673 if(!is_local_section(me, (void *)val, (void *)dot)) {
675 if (is_local(me, (void *)val))
676 /* this is the case where the
677 * symbol is local to the
678 * module, but in a different
679 * section, so stub the jump
680 * in case it's more than 22
682 val = get_stub(me, val, addend, ELF_STUB_DIRECT,
684 else if (strncmp(strtab + sym->st_name, "$$", 2)
686 val = get_stub(me, val, addend, ELF_STUB_MILLI,
689 val = get_stub(me, val, addend, ELF_STUB_GOT,
692 DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
693 strtab + sym->st_name, loc, sym->st_value,
695 /* FIXME: local symbols work as long as the
696 * core and init pieces aren't separated too
697 * far. If this is ever broken, you will trip
698 * the check below. The way to fix it would
699 * be to generate local stubs to go between init
701 if((Elf64_Sxword)(val - dot - 8) > 0x800000 -1 ||
702 (Elf64_Sxword)(val - dot - 8) < -0x800000) {
703 printk(KERN_ERR "Module %s, symbol %s is out of range for PCREL22F relocation\n",
704 me->name, strtab + sym->st_name);
707 val = (val - dot - 8)/4;
708 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
711 /* 64-bit effective address */
712 *loc64 = val + addend;
714 case R_PARISC_SEGREL32:
715 /* 32-bit segment relative address */
716 /* See note about special handling of SEGREL32 at
717 * the beginning of this file.
719 *loc = fsel(val, addend);
721 case R_PARISC_FPTR64:
722 /* 64-bit function address */
723 if(is_local(me, (void *)(val + addend))) {
724 *loc64 = get_fdesc(me, val+addend);
725 DEBUGP("FDESC for %s at %p points to %lx\n",
726 strtab + sym->st_name, *loc64,
727 ((Elf_Fdesc *)*loc64)->addr);
729 /* if the symbol is not local to this
730 * module then val+addend is a pointer
731 * to the function descriptor */
732 DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n",
733 strtab + sym->st_name,
735 *loc64 = val + addend;
740 printk(KERN_ERR "module %s: Unknown relocation: %Lu\n",
741 me->name, ELF64_R_TYPE(rel[i].r_info));
750 register_unwind_table(struct module *me,
751 const Elf_Shdr *sechdrs)
753 unsigned char *table, *end;
756 if (!me->arch.unwind_section)
759 table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
760 end = table + sechdrs[me->arch.unwind_section].sh_size;
761 gp = (Elf_Addr)me->module_core + me->arch.got_offset;
763 DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
764 me->arch.unwind_section, table, end, gp);
765 me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end);
769 deregister_unwind_table(struct module *me)
772 unwind_table_remove(me->arch.unwind);
775 int module_finalize(const Elf_Ehdr *hdr,
776 const Elf_Shdr *sechdrs,
781 const char *strtab = NULL;
782 Elf_Sym *newptr, *oldptr;
783 Elf_Shdr *symhdr = NULL;
788 entry = (Elf_Fdesc *)me->init;
789 printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry,
790 entry->gp, entry->addr);
791 addr = (u32 *)entry->addr;
792 printk("INSNS: %x %x %x %x\n",
793 addr[0], addr[1], addr[2], addr[3]);
794 printk("stubs used %ld, stubs max %ld\n"
795 "init_stubs used %ld, init stubs max %ld\n"
796 "got entries used %ld, gots max %ld\n"
797 "fdescs used %ld, fdescs max %ld\n",
798 me->arch.stub_count, me->arch.stub_max,
799 me->arch.init_stub_count, me->arch.init_stub_max,
800 me->arch.got_count, me->arch.got_max,
801 me->arch.fdesc_count, me->arch.fdesc_max);
804 register_unwind_table(me, sechdrs);
806 /* haven't filled in me->symtab yet, so have to find it
808 for (i = 1; i < hdr->e_shnum; i++) {
809 if(sechdrs[i].sh_type == SHT_SYMTAB
810 && (sechdrs[i].sh_type & SHF_ALLOC)) {
811 int strindex = sechdrs[i].sh_link;
813 * The cast is to drop the const from
814 * the sechdrs pointer */
815 symhdr = (Elf_Shdr *)&sechdrs[i];
816 strtab = (char *)sechdrs[strindex].sh_addr;
821 DEBUGP("module %s: strtab %p, symhdr %p\n",
822 me->name, strtab, symhdr);
824 if(me->arch.got_count > MAX_GOTS) {
825 printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d\n", me->name, me->arch.got_count, MAX_GOTS);
829 /* no symbol table */
833 oldptr = (void *)symhdr->sh_addr;
834 newptr = oldptr + 1; /* we start counting at 1 */
835 nsyms = symhdr->sh_size / sizeof(Elf_Sym);
836 DEBUGP("OLD num_symtab %lu\n", nsyms);
838 for (i = 1; i < nsyms; i++) {
839 oldptr++; /* note, count starts at 1 so preincrement */
840 if(strncmp(strtab + oldptr->st_name,
850 nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
851 DEBUGP("NEW num_symtab %lu\n", nsyms);
852 symhdr->sh_size = nsyms * sizeof(Elf_Sym);
856 void module_arch_cleanup(struct module *mod)
858 deregister_unwind_table(mod);