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[linux-2.6/next.git] / arch / parisc / kernel / module.c
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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>
9 * Copyright (C) 2008 Helge Deller <deller@gmx.de>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 * Notes:
28 * - PLT stub handling
29 * On 32bit (and sometimes 64bit) and with big kernel modules like xfs or
30 * ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may
31 * fail to reach their PLT stub if we only create one big stub array for
32 * all sections at the beginning of the core or init section.
33 * Instead we now insert individual PLT stub entries directly in front of
34 * of the code sections where the stubs are actually called.
35 * This reduces the distance between the PCREL location and the stub entry
36 * so that the relocations can be fulfilled.
37 * While calculating the final layout of the kernel module in memory, the
38 * kernel module loader calls arch_mod_section_prepend() to request the
39 * to be reserved amount of memory in front of each individual section.
41 * - SEGREL32 handling
42 * We are not doing SEGREL32 handling correctly. According to the ABI, we
43 * should do a value offset, like this:
44 * if (in_init(me, (void *)val))
45 * val -= (uint32_t)me->module_init;
46 * else
47 * val -= (uint32_t)me->module_core;
48 * However, SEGREL32 is used only for PARISC unwind entries, and we want
49 * those entries to have an absolute address, and not just an offset.
51 * The unwind table mechanism has the ability to specify an offset for
52 * the unwind table; however, because we split off the init functions into
53 * a different piece of memory, it is not possible to do this using a
54 * single offset. Instead, we use the above hack for now.
57 #include <linux/moduleloader.h>
58 #include <linux/elf.h>
59 #include <linux/vmalloc.h>
60 #include <linux/fs.h>
61 #include <linux/string.h>
62 #include <linux/kernel.h>
63 #include <linux/bug.h>
64 #include <linux/mm.h>
65 #include <linux/slab.h>
67 #include <asm/pgtable.h>
68 #include <asm/unwind.h>
70 #if 0
71 #define DEBUGP printk
72 #else
73 #define DEBUGP(fmt...)
74 #endif
76 #define RELOC_REACHABLE(val, bits) \
77 (( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
78 ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \
79 0 : 1)
81 #define CHECK_RELOC(val, bits) \
82 if (!RELOC_REACHABLE(val, bits)) { \
83 printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
84 me->name, strtab + sym->st_name, (unsigned long)val, bits); \
85 return -ENOEXEC; \
88 /* Maximum number of GOT entries. We use a long displacement ldd from
89 * the bottom of the table, which has a maximum signed displacement of
90 * 0x3fff; however, since we're only going forward, this becomes
91 * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
92 * at most 1023 entries.
93 * To overcome this 14bit displacement with some kernel modules, we'll
94 * use instead the unusal 16bit displacement method (see reassemble_16a)
95 * which gives us a maximum positive displacement of 0x7fff, and as such
96 * allows us to allocate up to 4095 GOT entries. */
97 #define MAX_GOTS 4095
99 /* three functions to determine where in the module core
100 * or init pieces the location is */
101 static inline int in_init(struct module *me, void *loc)
103 return (loc >= me->module_init &&
104 loc <= (me->module_init + me->init_size));
107 static inline int in_core(struct module *me, void *loc)
109 return (loc >= me->module_core &&
110 loc <= (me->module_core + me->core_size));
113 static inline int in_local(struct module *me, void *loc)
115 return in_init(me, loc) || in_core(me, loc);
118 #ifndef CONFIG_64BIT
119 struct got_entry {
120 Elf32_Addr addr;
123 struct stub_entry {
124 Elf32_Word insns[2]; /* each stub entry has two insns */
126 #else
127 struct got_entry {
128 Elf64_Addr addr;
131 struct stub_entry {
132 Elf64_Word insns[4]; /* each stub entry has four insns */
134 #endif
136 /* Field selection types defined by hppa */
137 #define rnd(x) (((x)+0x1000)&~0x1fff)
138 /* fsel: full 32 bits */
139 #define fsel(v,a) ((v)+(a))
140 /* lsel: select left 21 bits */
141 #define lsel(v,a) (((v)+(a))>>11)
142 /* rsel: select right 11 bits */
143 #define rsel(v,a) (((v)+(a))&0x7ff)
144 /* lrsel with rounding of addend to nearest 8k */
145 #define lrsel(v,a) (((v)+rnd(a))>>11)
146 /* rrsel with rounding of addend to nearest 8k */
147 #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
149 #define mask(x,sz) ((x) & ~((1<<(sz))-1))
152 /* The reassemble_* functions prepare an immediate value for
153 insertion into an opcode. pa-risc uses all sorts of weird bitfields
154 in the instruction to hold the value. */
155 static inline int sign_unext(int x, int len)
157 int len_ones;
159 len_ones = (1 << len) - 1;
160 return x & len_ones;
163 static inline int low_sign_unext(int x, int len)
165 int sign, temp;
167 sign = (x >> (len-1)) & 1;
168 temp = sign_unext(x, len-1);
169 return (temp << 1) | sign;
172 static inline int reassemble_14(int as14)
174 return (((as14 & 0x1fff) << 1) |
175 ((as14 & 0x2000) >> 13));
178 static inline int reassemble_16a(int as16)
180 int s, t;
182 /* Unusual 16-bit encoding, for wide mode only. */
183 t = (as16 << 1) & 0xffff;
184 s = (as16 & 0x8000);
185 return (t ^ s ^ (s >> 1)) | (s >> 15);
189 static inline int reassemble_17(int as17)
191 return (((as17 & 0x10000) >> 16) |
192 ((as17 & 0x0f800) << 5) |
193 ((as17 & 0x00400) >> 8) |
194 ((as17 & 0x003ff) << 3));
197 static inline int reassemble_21(int as21)
199 return (((as21 & 0x100000) >> 20) |
200 ((as21 & 0x0ffe00) >> 8) |
201 ((as21 & 0x000180) << 7) |
202 ((as21 & 0x00007c) << 14) |
203 ((as21 & 0x000003) << 12));
206 static inline int reassemble_22(int as22)
208 return (((as22 & 0x200000) >> 21) |
209 ((as22 & 0x1f0000) << 5) |
210 ((as22 & 0x00f800) << 5) |
211 ((as22 & 0x000400) >> 8) |
212 ((as22 & 0x0003ff) << 3));
215 void *module_alloc(unsigned long size)
217 if (size == 0)
218 return NULL;
219 /* using RWX means less protection for modules, but it's
220 * easier than trying to map the text, data, init_text and
221 * init_data correctly */
222 return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
223 GFP_KERNEL | __GFP_HIGHMEM,
224 PAGE_KERNEL_RWX, -1,
225 __builtin_return_address(0));
228 #ifndef CONFIG_64BIT
229 static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
231 return 0;
234 static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
236 return 0;
239 static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
241 unsigned long cnt = 0;
243 for (; n > 0; n--, rela++)
245 switch (ELF32_R_TYPE(rela->r_info)) {
246 case R_PARISC_PCREL17F:
247 case R_PARISC_PCREL22F:
248 cnt++;
252 return cnt;
254 #else
255 static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
257 unsigned long cnt = 0;
259 for (; n > 0; n--, rela++)
261 switch (ELF64_R_TYPE(rela->r_info)) {
262 case R_PARISC_LTOFF21L:
263 case R_PARISC_LTOFF14R:
264 case R_PARISC_PCREL22F:
265 cnt++;
269 return cnt;
272 static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
274 unsigned long cnt = 0;
276 for (; n > 0; n--, rela++)
278 switch (ELF64_R_TYPE(rela->r_info)) {
279 case R_PARISC_FPTR64:
280 cnt++;
284 return cnt;
287 static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
289 unsigned long cnt = 0;
291 for (; n > 0; n--, rela++)
293 switch (ELF64_R_TYPE(rela->r_info)) {
294 case R_PARISC_PCREL22F:
295 cnt++;
299 return cnt;
301 #endif
304 /* Free memory returned from module_alloc */
305 void module_free(struct module *mod, void *module_region)
307 kfree(mod->arch.section);
308 mod->arch.section = NULL;
310 vfree(module_region);
313 /* Additional bytes needed in front of individual sections */
314 unsigned int arch_mod_section_prepend(struct module *mod,
315 unsigned int section)
317 /* size needed for all stubs of this section (including
318 * one additional for correct alignment of the stubs) */
319 return (mod->arch.section[section].stub_entries + 1)
320 * sizeof(struct stub_entry);
323 #define CONST
324 int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
325 CONST Elf_Shdr *sechdrs,
326 CONST char *secstrings,
327 struct module *me)
329 unsigned long gots = 0, fdescs = 0, len;
330 unsigned int i;
332 len = hdr->e_shnum * sizeof(me->arch.section[0]);
333 me->arch.section = kzalloc(len, GFP_KERNEL);
334 if (!me->arch.section)
335 return -ENOMEM;
337 for (i = 1; i < hdr->e_shnum; i++) {
338 const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
339 unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
340 unsigned int count, s;
342 if (strncmp(secstrings + sechdrs[i].sh_name,
343 ".PARISC.unwind", 14) == 0)
344 me->arch.unwind_section = i;
346 if (sechdrs[i].sh_type != SHT_RELA)
347 continue;
349 /* some of these are not relevant for 32-bit/64-bit
350 * we leave them here to make the code common. the
351 * compiler will do its thing and optimize out the
352 * stuff we don't need
354 gots += count_gots(rels, nrels);
355 fdescs += count_fdescs(rels, nrels);
357 /* XXX: By sorting the relocs and finding duplicate entries
358 * we could reduce the number of necessary stubs and save
359 * some memory. */
360 count = count_stubs(rels, nrels);
361 if (!count)
362 continue;
364 /* so we need relocation stubs. reserve necessary memory. */
365 /* sh_info gives the section for which we need to add stubs. */
366 s = sechdrs[i].sh_info;
368 /* each code section should only have one relocation section */
369 WARN_ON(me->arch.section[s].stub_entries);
371 /* store number of stubs we need for this section */
372 me->arch.section[s].stub_entries += count;
375 /* align things a bit */
376 me->core_size = ALIGN(me->core_size, 16);
377 me->arch.got_offset = me->core_size;
378 me->core_size += gots * sizeof(struct got_entry);
380 me->core_size = ALIGN(me->core_size, 16);
381 me->arch.fdesc_offset = me->core_size;
382 me->core_size += fdescs * sizeof(Elf_Fdesc);
384 me->arch.got_max = gots;
385 me->arch.fdesc_max = fdescs;
387 return 0;
390 #ifdef CONFIG_64BIT
391 static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
393 unsigned int i;
394 struct got_entry *got;
396 value += addend;
398 BUG_ON(value == 0);
400 got = me->module_core + me->arch.got_offset;
401 for (i = 0; got[i].addr; i++)
402 if (got[i].addr == value)
403 goto out;
405 BUG_ON(++me->arch.got_count > me->arch.got_max);
407 got[i].addr = value;
408 out:
409 DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry),
410 value);
411 return i * sizeof(struct got_entry);
413 #endif /* CONFIG_64BIT */
415 #ifdef CONFIG_64BIT
416 static Elf_Addr get_fdesc(struct module *me, unsigned long value)
418 Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset;
420 if (!value) {
421 printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
422 return 0;
425 /* Look for existing fdesc entry. */
426 while (fdesc->addr) {
427 if (fdesc->addr == value)
428 return (Elf_Addr)fdesc;
429 fdesc++;
432 BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
434 /* Create new one */
435 fdesc->addr = value;
436 fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
437 return (Elf_Addr)fdesc;
439 #endif /* CONFIG_64BIT */
441 enum elf_stub_type {
442 ELF_STUB_GOT,
443 ELF_STUB_MILLI,
444 ELF_STUB_DIRECT,
447 static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
448 enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
450 struct stub_entry *stub;
451 int __maybe_unused d;
453 /* initialize stub_offset to point in front of the section */
454 if (!me->arch.section[targetsec].stub_offset) {
455 loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
456 sizeof(struct stub_entry);
457 /* get correct alignment for the stubs */
458 loc0 = ALIGN(loc0, sizeof(struct stub_entry));
459 me->arch.section[targetsec].stub_offset = loc0;
462 /* get address of stub entry */
463 stub = (void *) me->arch.section[targetsec].stub_offset;
464 me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
466 /* do not write outside available stub area */
467 BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
470 #ifndef CONFIG_64BIT
471 /* for 32-bit the stub looks like this:
472 * ldil L'XXX,%r1
473 * be,n R'XXX(%sr4,%r1)
475 //value = *(unsigned long *)((value + addend) & ~3); /* why? */
477 stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */
478 stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */
480 stub->insns[0] |= reassemble_21(lrsel(value, addend));
481 stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
483 #else
484 /* for 64-bit we have three kinds of stubs:
485 * for normal function calls:
486 * ldd 0(%dp),%dp
487 * ldd 10(%dp), %r1
488 * bve (%r1)
489 * ldd 18(%dp), %dp
491 * for millicode:
492 * ldil 0, %r1
493 * ldo 0(%r1), %r1
494 * ldd 10(%r1), %r1
495 * bve,n (%r1)
497 * for direct branches (jumps between different section of the
498 * same module):
499 * ldil 0, %r1
500 * ldo 0(%r1), %r1
501 * bve,n (%r1)
503 switch (stub_type) {
504 case ELF_STUB_GOT:
505 d = get_got(me, value, addend);
506 if (d <= 15) {
507 /* Format 5 */
508 stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */
509 stub->insns[0] |= low_sign_unext(d, 5) << 16;
510 } else {
511 /* Format 3 */
512 stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */
513 stub->insns[0] |= reassemble_16a(d);
515 stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */
516 stub->insns[2] = 0xe820d000; /* bve (%r1) */
517 stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */
518 break;
519 case ELF_STUB_MILLI:
520 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
521 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
522 stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */
523 stub->insns[3] = 0xe820d002; /* bve,n (%r1) */
525 stub->insns[0] |= reassemble_21(lrsel(value, addend));
526 stub->insns[1] |= reassemble_14(rrsel(value, addend));
527 break;
528 case ELF_STUB_DIRECT:
529 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
530 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
531 stub->insns[2] = 0xe820d002; /* bve,n (%r1) */
533 stub->insns[0] |= reassemble_21(lrsel(value, addend));
534 stub->insns[1] |= reassemble_14(rrsel(value, addend));
535 break;
538 #endif
540 return (Elf_Addr)stub;
543 int apply_relocate(Elf_Shdr *sechdrs,
544 const char *strtab,
545 unsigned int symindex,
546 unsigned int relsec,
547 struct module *me)
549 /* parisc should not need this ... */
550 printk(KERN_ERR "module %s: RELOCATION unsupported\n",
551 me->name);
552 return -ENOEXEC;
555 #ifndef CONFIG_64BIT
556 int apply_relocate_add(Elf_Shdr *sechdrs,
557 const char *strtab,
558 unsigned int symindex,
559 unsigned int relsec,
560 struct module *me)
562 int i;
563 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
564 Elf32_Sym *sym;
565 Elf32_Word *loc;
566 Elf32_Addr val;
567 Elf32_Sword addend;
568 Elf32_Addr dot;
569 Elf_Addr loc0;
570 unsigned int targetsec = sechdrs[relsec].sh_info;
571 //unsigned long dp = (unsigned long)$global$;
572 register unsigned long dp asm ("r27");
574 DEBUGP("Applying relocate section %u to %u\n", relsec,
575 targetsec);
576 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
577 /* This is where to make the change */
578 loc = (void *)sechdrs[targetsec].sh_addr
579 + rel[i].r_offset;
580 /* This is the start of the target section */
581 loc0 = sechdrs[targetsec].sh_addr;
582 /* This is the symbol it is referring to */
583 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
584 + ELF32_R_SYM(rel[i].r_info);
585 if (!sym->st_value) {
586 printk(KERN_WARNING "%s: Unknown symbol %s\n",
587 me->name, strtab + sym->st_name);
588 return -ENOENT;
590 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
591 dot = (Elf32_Addr)loc & ~0x03;
593 val = sym->st_value;
594 addend = rel[i].r_addend;
596 #if 0
597 #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
598 DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
599 strtab + sym->st_name,
600 (uint32_t)loc, val, addend,
601 r(R_PARISC_PLABEL32)
602 r(R_PARISC_DIR32)
603 r(R_PARISC_DIR21L)
604 r(R_PARISC_DIR14R)
605 r(R_PARISC_SEGREL32)
606 r(R_PARISC_DPREL21L)
607 r(R_PARISC_DPREL14R)
608 r(R_PARISC_PCREL17F)
609 r(R_PARISC_PCREL22F)
610 "UNKNOWN");
611 #undef r
612 #endif
614 switch (ELF32_R_TYPE(rel[i].r_info)) {
615 case R_PARISC_PLABEL32:
616 /* 32-bit function address */
617 /* no function descriptors... */
618 *loc = fsel(val, addend);
619 break;
620 case R_PARISC_DIR32:
621 /* direct 32-bit ref */
622 *loc = fsel(val, addend);
623 break;
624 case R_PARISC_DIR21L:
625 /* left 21 bits of effective address */
626 val = lrsel(val, addend);
627 *loc = mask(*loc, 21) | reassemble_21(val);
628 break;
629 case R_PARISC_DIR14R:
630 /* right 14 bits of effective address */
631 val = rrsel(val, addend);
632 *loc = mask(*loc, 14) | reassemble_14(val);
633 break;
634 case R_PARISC_SEGREL32:
635 /* 32-bit segment relative address */
636 /* See note about special handling of SEGREL32 at
637 * the beginning of this file.
639 *loc = fsel(val, addend);
640 break;
641 case R_PARISC_DPREL21L:
642 /* left 21 bit of relative address */
643 val = lrsel(val - dp, addend);
644 *loc = mask(*loc, 21) | reassemble_21(val);
645 break;
646 case R_PARISC_DPREL14R:
647 /* right 14 bit of relative address */
648 val = rrsel(val - dp, addend);
649 *loc = mask(*loc, 14) | reassemble_14(val);
650 break;
651 case R_PARISC_PCREL17F:
652 /* 17-bit PC relative address */
653 /* calculate direct call offset */
654 val += addend;
655 val = (val - dot - 8)/4;
656 if (!RELOC_REACHABLE(val, 17)) {
657 /* direct distance too far, create
658 * stub entry instead */
659 val = get_stub(me, sym->st_value, addend,
660 ELF_STUB_DIRECT, loc0, targetsec);
661 val = (val - dot - 8)/4;
662 CHECK_RELOC(val, 17);
664 *loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
665 break;
666 case R_PARISC_PCREL22F:
667 /* 22-bit PC relative address; only defined for pa20 */
668 /* calculate direct call offset */
669 val += addend;
670 val = (val - dot - 8)/4;
671 if (!RELOC_REACHABLE(val, 22)) {
672 /* direct distance too far, create
673 * stub entry instead */
674 val = get_stub(me, sym->st_value, addend,
675 ELF_STUB_DIRECT, loc0, targetsec);
676 val = (val - dot - 8)/4;
677 CHECK_RELOC(val, 22);
679 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
680 break;
682 default:
683 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
684 me->name, ELF32_R_TYPE(rel[i].r_info));
685 return -ENOEXEC;
689 return 0;
692 #else
693 int apply_relocate_add(Elf_Shdr *sechdrs,
694 const char *strtab,
695 unsigned int symindex,
696 unsigned int relsec,
697 struct module *me)
699 int i;
700 Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
701 Elf64_Sym *sym;
702 Elf64_Word *loc;
703 Elf64_Xword *loc64;
704 Elf64_Addr val;
705 Elf64_Sxword addend;
706 Elf64_Addr dot;
707 Elf_Addr loc0;
708 unsigned int targetsec = sechdrs[relsec].sh_info;
710 DEBUGP("Applying relocate section %u to %u\n", relsec,
711 targetsec);
712 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
713 /* This is where to make the change */
714 loc = (void *)sechdrs[targetsec].sh_addr
715 + rel[i].r_offset;
716 /* This is the start of the target section */
717 loc0 = sechdrs[targetsec].sh_addr;
718 /* This is the symbol it is referring to */
719 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
720 + ELF64_R_SYM(rel[i].r_info);
721 if (!sym->st_value) {
722 printk(KERN_WARNING "%s: Unknown symbol %s\n",
723 me->name, strtab + sym->st_name);
724 return -ENOENT;
726 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
727 dot = (Elf64_Addr)loc & ~0x03;
728 loc64 = (Elf64_Xword *)loc;
730 val = sym->st_value;
731 addend = rel[i].r_addend;
733 #if 0
734 #define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t :
735 printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n",
736 strtab + sym->st_name,
737 loc, val, addend,
738 r(R_PARISC_LTOFF14R)
739 r(R_PARISC_LTOFF21L)
740 r(R_PARISC_PCREL22F)
741 r(R_PARISC_DIR64)
742 r(R_PARISC_SEGREL32)
743 r(R_PARISC_FPTR64)
744 "UNKNOWN");
745 #undef r
746 #endif
748 switch (ELF64_R_TYPE(rel[i].r_info)) {
749 case R_PARISC_LTOFF21L:
750 /* LT-relative; left 21 bits */
751 val = get_got(me, val, addend);
752 DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n",
753 strtab + sym->st_name,
754 loc, val);
755 val = lrsel(val, 0);
756 *loc = mask(*loc, 21) | reassemble_21(val);
757 break;
758 case R_PARISC_LTOFF14R:
759 /* L(ltoff(val+addend)) */
760 /* LT-relative; right 14 bits */
761 val = get_got(me, val, addend);
762 val = rrsel(val, 0);
763 DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n",
764 strtab + sym->st_name,
765 loc, val);
766 *loc = mask(*loc, 14) | reassemble_14(val);
767 break;
768 case R_PARISC_PCREL22F:
769 /* PC-relative; 22 bits */
770 DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
771 strtab + sym->st_name,
772 loc, val);
773 val += addend;
774 /* can we reach it locally? */
775 if (in_local(me, (void *)val)) {
776 /* this is the case where the symbol is local
777 * to the module, but in a different section,
778 * so stub the jump in case it's more than 22
779 * bits away */
780 val = (val - dot - 8)/4;
781 if (!RELOC_REACHABLE(val, 22)) {
782 /* direct distance too far, create
783 * stub entry instead */
784 val = get_stub(me, sym->st_value,
785 addend, ELF_STUB_DIRECT,
786 loc0, targetsec);
787 } else {
788 /* Ok, we can reach it directly. */
789 val = sym->st_value;
790 val += addend;
792 } else {
793 val = sym->st_value;
794 if (strncmp(strtab + sym->st_name, "$$", 2)
795 == 0)
796 val = get_stub(me, val, addend, ELF_STUB_MILLI,
797 loc0, targetsec);
798 else
799 val = get_stub(me, val, addend, ELF_STUB_GOT,
800 loc0, targetsec);
802 DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
803 strtab + sym->st_name, loc, sym->st_value,
804 addend, val);
805 val = (val - dot - 8)/4;
806 CHECK_RELOC(val, 22);
807 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
808 break;
809 case R_PARISC_DIR64:
810 /* 64-bit effective address */
811 *loc64 = val + addend;
812 break;
813 case R_PARISC_SEGREL32:
814 /* 32-bit segment relative address */
815 /* See note about special handling of SEGREL32 at
816 * the beginning of this file.
818 *loc = fsel(val, addend);
819 break;
820 case R_PARISC_FPTR64:
821 /* 64-bit function address */
822 if(in_local(me, (void *)(val + addend))) {
823 *loc64 = get_fdesc(me, val+addend);
824 DEBUGP("FDESC for %s at %p points to %lx\n",
825 strtab + sym->st_name, *loc64,
826 ((Elf_Fdesc *)*loc64)->addr);
827 } else {
828 /* if the symbol is not local to this
829 * module then val+addend is a pointer
830 * to the function descriptor */
831 DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n",
832 strtab + sym->st_name,
833 loc, val);
834 *loc64 = val + addend;
836 break;
838 default:
839 printk(KERN_ERR "module %s: Unknown relocation: %Lu\n",
840 me->name, ELF64_R_TYPE(rel[i].r_info));
841 return -ENOEXEC;
844 return 0;
846 #endif
848 static void
849 register_unwind_table(struct module *me,
850 const Elf_Shdr *sechdrs)
852 unsigned char *table, *end;
853 unsigned long gp;
855 if (!me->arch.unwind_section)
856 return;
858 table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
859 end = table + sechdrs[me->arch.unwind_section].sh_size;
860 gp = (Elf_Addr)me->module_core + me->arch.got_offset;
862 DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
863 me->arch.unwind_section, table, end, gp);
864 me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end);
867 static void
868 deregister_unwind_table(struct module *me)
870 if (me->arch.unwind)
871 unwind_table_remove(me->arch.unwind);
874 int module_finalize(const Elf_Ehdr *hdr,
875 const Elf_Shdr *sechdrs,
876 struct module *me)
878 int i;
879 unsigned long nsyms;
880 const char *strtab = NULL;
881 Elf_Sym *newptr, *oldptr;
882 Elf_Shdr *symhdr = NULL;
883 #ifdef DEBUG
884 Elf_Fdesc *entry;
885 u32 *addr;
887 entry = (Elf_Fdesc *)me->init;
888 printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry,
889 entry->gp, entry->addr);
890 addr = (u32 *)entry->addr;
891 printk("INSNS: %x %x %x %x\n",
892 addr[0], addr[1], addr[2], addr[3]);
893 printk("got entries used %ld, gots max %ld\n"
894 "fdescs used %ld, fdescs max %ld\n",
895 me->arch.got_count, me->arch.got_max,
896 me->arch.fdesc_count, me->arch.fdesc_max);
897 #endif
899 register_unwind_table(me, sechdrs);
901 /* haven't filled in me->symtab yet, so have to find it
902 * ourselves */
903 for (i = 1; i < hdr->e_shnum; i++) {
904 if(sechdrs[i].sh_type == SHT_SYMTAB
905 && (sechdrs[i].sh_flags & SHF_ALLOC)) {
906 int strindex = sechdrs[i].sh_link;
907 /* FIXME: AWFUL HACK
908 * The cast is to drop the const from
909 * the sechdrs pointer */
910 symhdr = (Elf_Shdr *)&sechdrs[i];
911 strtab = (char *)sechdrs[strindex].sh_addr;
912 break;
916 DEBUGP("module %s: strtab %p, symhdr %p\n",
917 me->name, strtab, symhdr);
919 if(me->arch.got_count > MAX_GOTS) {
920 printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n",
921 me->name, me->arch.got_count, MAX_GOTS);
922 return -EINVAL;
925 kfree(me->arch.section);
926 me->arch.section = NULL;
928 /* no symbol table */
929 if(symhdr == NULL)
930 return 0;
932 oldptr = (void *)symhdr->sh_addr;
933 newptr = oldptr + 1; /* we start counting at 1 */
934 nsyms = symhdr->sh_size / sizeof(Elf_Sym);
935 DEBUGP("OLD num_symtab %lu\n", nsyms);
937 for (i = 1; i < nsyms; i++) {
938 oldptr++; /* note, count starts at 1 so preincrement */
939 if(strncmp(strtab + oldptr->st_name,
940 ".L", 2) == 0)
941 continue;
943 if(newptr != oldptr)
944 *newptr++ = *oldptr;
945 else
946 newptr++;
949 nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
950 DEBUGP("NEW num_symtab %lu\n", nsyms);
951 symhdr->sh_size = nsyms * sizeof(Elf_Sym);
952 return 0;
955 void module_arch_cleanup(struct module *mod)
957 deregister_unwind_table(mod);