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
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.
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;
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>
61 #include <linux/string.h>
62 #include <linux/kernel.h>
63 #include <linux/bug.h>
64 #include <linux/slab.h>
66 #include <asm/unwind.h>
68 #define DEBUGP(fmt...)
70 #define RELOC_REACHABLE(val, bits) \
71 (( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
72 ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \
75 #define CHECK_RELOC(val, bits) \
76 if (!RELOC_REACHABLE(val, bits)) { \
77 printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
78 me->name, strtab + sym->st_name, (unsigned long)val, bits); \
82 /* Maximum number of GOT entries. We use a long displacement ldd from
83 * the bottom of the table, which has a maximum signed displacement of
84 * 0x3fff; however, since we're only going forward, this becomes
85 * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have
86 * at most 1023 entries.
87 * To overcome this 14bit displacement with some kernel modules, we'll
88 * use instead the unusal 16bit displacement method (see reassemble_16a)
89 * which gives us a maximum positive displacement of 0x7fff, and as such
90 * allows us to allocate up to 4095 GOT entries. */
93 /* three functions to determine where in the module core
94 * or init pieces the location is */
95 static inline int in_init(struct module
*me
, void *loc
)
97 return (loc
>= me
->module_init
&&
98 loc
<= (me
->module_init
+ me
->init_size
));
101 static inline int in_core(struct module
*me
, void *loc
)
103 return (loc
>= me
->module_core
&&
104 loc
<= (me
->module_core
+ me
->core_size
));
107 static inline int in_local(struct module
*me
, void *loc
)
109 return in_init(me
, loc
) || in_core(me
, loc
);
118 Elf32_Word insns
[2]; /* each stub entry has two insns */
126 Elf64_Word insns
[4]; /* each stub entry has four insns */
130 /* Field selection types defined by hppa */
131 #define rnd(x) (((x)+0x1000)&~0x1fff)
132 /* fsel: full 32 bits */
133 #define fsel(v,a) ((v)+(a))
134 /* lsel: select left 21 bits */
135 #define lsel(v,a) (((v)+(a))>>11)
136 /* rsel: select right 11 bits */
137 #define rsel(v,a) (((v)+(a))&0x7ff)
138 /* lrsel with rounding of addend to nearest 8k */
139 #define lrsel(v,a) (((v)+rnd(a))>>11)
140 /* rrsel with rounding of addend to nearest 8k */
141 #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a)))
143 #define mask(x,sz) ((x) & ~((1<<(sz))-1))
146 /* The reassemble_* functions prepare an immediate value for
147 insertion into an opcode. pa-risc uses all sorts of weird bitfields
148 in the instruction to hold the value. */
149 static inline int sign_unext(int x
, int len
)
153 len_ones
= (1 << len
) - 1;
157 static inline int low_sign_unext(int x
, int len
)
161 sign
= (x
>> (len
-1)) & 1;
162 temp
= sign_unext(x
, len
-1);
163 return (temp
<< 1) | sign
;
166 static inline int reassemble_14(int as14
)
168 return (((as14
& 0x1fff) << 1) |
169 ((as14
& 0x2000) >> 13));
172 static inline int reassemble_16a(int as16
)
176 /* Unusual 16-bit encoding, for wide mode only. */
177 t
= (as16
<< 1) & 0xffff;
179 return (t
^ s
^ (s
>> 1)) | (s
>> 15);
183 static inline int reassemble_17(int as17
)
185 return (((as17
& 0x10000) >> 16) |
186 ((as17
& 0x0f800) << 5) |
187 ((as17
& 0x00400) >> 8) |
188 ((as17
& 0x003ff) << 3));
191 static inline int reassemble_21(int as21
)
193 return (((as21
& 0x100000) >> 20) |
194 ((as21
& 0x0ffe00) >> 8) |
195 ((as21
& 0x000180) << 7) |
196 ((as21
& 0x00007c) << 14) |
197 ((as21
& 0x000003) << 12));
200 static inline int reassemble_22(int as22
)
202 return (((as22
& 0x200000) >> 21) |
203 ((as22
& 0x1f0000) << 5) |
204 ((as22
& 0x00f800) << 5) |
205 ((as22
& 0x000400) >> 8) |
206 ((as22
& 0x0003ff) << 3));
209 void *module_alloc(unsigned long size
)
213 return vmalloc(size
);
217 static inline unsigned long count_gots(const Elf_Rela
*rela
, unsigned long n
)
222 static inline unsigned long count_fdescs(const Elf_Rela
*rela
, unsigned long n
)
227 static inline unsigned long count_stubs(const Elf_Rela
*rela
, unsigned long n
)
229 unsigned long cnt
= 0;
231 for (; n
> 0; n
--, rela
++)
233 switch (ELF32_R_TYPE(rela
->r_info
)) {
234 case R_PARISC_PCREL17F
:
235 case R_PARISC_PCREL22F
:
243 static inline unsigned long count_gots(const Elf_Rela
*rela
, unsigned long n
)
245 unsigned long cnt
= 0;
247 for (; n
> 0; n
--, rela
++)
249 switch (ELF64_R_TYPE(rela
->r_info
)) {
250 case R_PARISC_LTOFF21L
:
251 case R_PARISC_LTOFF14R
:
252 case R_PARISC_PCREL22F
:
260 static inline unsigned long count_fdescs(const Elf_Rela
*rela
, unsigned long n
)
262 unsigned long cnt
= 0;
264 for (; n
> 0; n
--, rela
++)
266 switch (ELF64_R_TYPE(rela
->r_info
)) {
267 case R_PARISC_FPTR64
:
275 static inline unsigned long count_stubs(const Elf_Rela
*rela
, unsigned long n
)
277 unsigned long cnt
= 0;
279 for (; n
> 0; n
--, rela
++)
281 switch (ELF64_R_TYPE(rela
->r_info
)) {
282 case R_PARISC_PCREL22F
:
292 /* Free memory returned from module_alloc */
293 void module_free(struct module
*mod
, void *module_region
)
295 kfree(mod
->arch
.section
);
296 mod
->arch
.section
= NULL
;
298 vfree(module_region
);
301 /* Additional bytes needed in front of individual sections */
302 unsigned int arch_mod_section_prepend(struct module
*mod
,
303 unsigned int section
)
305 /* size needed for all stubs of this section (including
306 * one additional for correct alignment of the stubs) */
307 return (mod
->arch
.section
[section
].stub_entries
+ 1)
308 * sizeof(struct stub_entry
);
312 int module_frob_arch_sections(CONST Elf_Ehdr
*hdr
,
313 CONST Elf_Shdr
*sechdrs
,
314 CONST
char *secstrings
,
317 unsigned long gots
= 0, fdescs
= 0, len
;
320 len
= hdr
->e_shnum
* sizeof(me
->arch
.section
[0]);
321 me
->arch
.section
= kzalloc(len
, GFP_KERNEL
);
322 if (!me
->arch
.section
)
325 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
326 const Elf_Rela
*rels
= (void *)sechdrs
[i
].sh_addr
;
327 unsigned long nrels
= sechdrs
[i
].sh_size
/ sizeof(*rels
);
328 unsigned int count
, s
;
330 if (strncmp(secstrings
+ sechdrs
[i
].sh_name
,
331 ".PARISC.unwind", 14) == 0)
332 me
->arch
.unwind_section
= i
;
334 if (sechdrs
[i
].sh_type
!= SHT_RELA
)
337 /* some of these are not relevant for 32-bit/64-bit
338 * we leave them here to make the code common. the
339 * compiler will do its thing and optimize out the
340 * stuff we don't need
342 gots
+= count_gots(rels
, nrels
);
343 fdescs
+= count_fdescs(rels
, nrels
);
345 count
= count_stubs(rels
, nrels
);
349 /* so we need relocation stubs. reserve necessary memory. */
350 /* sh_info gives the section for which we need to add stubs. */
351 s
= sechdrs
[i
].sh_info
;
353 /* each code section should only have one relocation section */
354 WARN_ON(me
->arch
.section
[s
].stub_entries
);
356 /* store number of stubs we need for this section */
357 me
->arch
.section
[s
].stub_entries
+= count
;
360 /* align things a bit */
361 me
->core_size
= ALIGN(me
->core_size
, 16);
362 me
->arch
.got_offset
= me
->core_size
;
363 me
->core_size
+= gots
* sizeof(struct got_entry
);
365 me
->core_size
= ALIGN(me
->core_size
, 16);
366 me
->arch
.fdesc_offset
= me
->core_size
;
367 me
->core_size
+= fdescs
* sizeof(Elf_Fdesc
);
369 me
->arch
.got_max
= gots
;
370 me
->arch
.fdesc_max
= fdescs
;
376 static Elf64_Word
get_got(struct module
*me
, unsigned long value
, long addend
)
379 struct got_entry
*got
;
385 got
= me
->module_core
+ me
->arch
.got_offset
;
386 for (i
= 0; got
[i
].addr
; i
++)
387 if (got
[i
].addr
== value
)
390 BUG_ON(++me
->arch
.got_count
> me
->arch
.got_max
);
394 DEBUGP("GOT ENTRY %d[%x] val %lx\n", i
, i
*sizeof(struct got_entry
),
396 return i
* sizeof(struct got_entry
);
398 #endif /* CONFIG_64BIT */
401 static Elf_Addr
get_fdesc(struct module
*me
, unsigned long value
)
403 Elf_Fdesc
*fdesc
= me
->module_core
+ me
->arch
.fdesc_offset
;
406 printk(KERN_ERR
"%s: zero OPD requested!\n", me
->name
);
410 /* Look for existing fdesc entry. */
411 while (fdesc
->addr
) {
412 if (fdesc
->addr
== value
)
413 return (Elf_Addr
)fdesc
;
417 BUG_ON(++me
->arch
.fdesc_count
> me
->arch
.fdesc_max
);
421 fdesc
->gp
= (Elf_Addr
)me
->module_core
+ me
->arch
.got_offset
;
422 return (Elf_Addr
)fdesc
;
424 #endif /* CONFIG_64BIT */
432 static Elf_Addr
get_stub(struct module
*me
, unsigned long value
, long addend
,
433 enum elf_stub_type stub_type
, Elf_Addr loc0
, unsigned int targetsec
)
435 struct stub_entry
*stub
;
436 int __maybe_unused d
;
438 /* initialize stub_offset to point in front of the section */
439 if (!me
->arch
.section
[targetsec
].stub_offset
) {
440 loc0
-= (me
->arch
.section
[targetsec
].stub_entries
+ 1) *
441 sizeof(struct stub_entry
);
442 /* get correct alignment for the stubs */
443 loc0
= ALIGN(loc0
, sizeof(struct stub_entry
));
444 me
->arch
.section
[targetsec
].stub_offset
= loc0
;
447 /* get address of stub entry */
448 stub
= (void *) me
->arch
.section
[targetsec
].stub_offset
;
449 me
->arch
.section
[targetsec
].stub_offset
+= sizeof(struct stub_entry
);
451 /* do not write outside available stub area */
452 BUG_ON(0 == me
->arch
.section
[targetsec
].stub_entries
--);
456 //value = *(unsigned long *)((value + addend) & ~3); /* why? */
458 stub
->insns
[0] = 0x20200000;
459 stub
->insns
[1] = 0xe0202002;
461 stub
->insns
[0] |= reassemble_21(lrsel(value
, addend
));
462 stub
->insns
[1] |= reassemble_17(rrsel(value
, addend
) / 4);
465 /* for 64-bit we have three kinds of stubs:
466 * for normal function calls:
478 * for direct branches (jumps between different section of the
486 d
= get_got(me
, value
, addend
);
489 stub
->insns
[0] = 0x0f6010db; /* ldd 0(%dp),%dp */
490 stub
->insns
[0] |= low_sign_unext(d
, 5) << 16;
493 stub
->insns
[0] = 0x537b0000; /* ldd 0(%dp),%dp */
494 stub
->insns
[0] |= reassemble_16a(d
);
496 stub
->insns
[1] = 0x53610020; /* ldd 10(%dp),%r1 */
497 stub
->insns
[2] = 0xe820d000; /* bve (%r1) */
498 stub
->insns
[3] = 0x537b0030; /* ldd 18(%dp),%dp */
501 stub
->insns
[0] = 0x20200000; /* ldil 0,%r1 */
502 stub
->insns
[1] = 0x34210000; /* ldo 0(%r1), %r1 */
503 stub
->insns
[2] = 0x50210020; /* ldd 10(%r1),%r1 */
504 stub
->insns
[3] = 0xe820d002; /* bve,n (%r1) */
506 stub
->insns
[0] |= reassemble_21(lrsel(value
, addend
));
507 stub
->insns
[1] |= reassemble_14(rrsel(value
, addend
));
509 case ELF_STUB_DIRECT
:
510 stub
->insns
[0] = 0x20200000; /* ldil 0,%r1 */
511 stub
->insns
[1] = 0x34210000; /* ldo 0(%r1), %r1 */
512 stub
->insns
[2] = 0xe820d002; /* bve,n (%r1) */
514 stub
->insns
[0] |= reassemble_21(lrsel(value
, addend
));
515 stub
->insns
[1] |= reassemble_14(rrsel(value
, addend
));
521 return (Elf_Addr
)stub
;
524 int apply_relocate(Elf_Shdr
*sechdrs
,
526 unsigned int symindex
,
530 /* parisc should not need this ... */
531 printk(KERN_ERR
"module %s: RELOCATION unsupported\n",
537 int apply_relocate_add(Elf_Shdr
*sechdrs
,
539 unsigned int symindex
,
544 Elf32_Rela
*rel
= (void *)sechdrs
[relsec
].sh_addr
;
551 unsigned int targetsec
= sechdrs
[relsec
].sh_info
;
552 //unsigned long dp = (unsigned long)$global$;
553 register unsigned long dp
asm ("r27");
555 DEBUGP("Applying relocate section %u to %u\n", relsec
,
557 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
558 /* This is where to make the change */
559 loc
= (void *)sechdrs
[targetsec
].sh_addr
561 /* This is the start of the target section */
562 loc0
= sechdrs
[targetsec
].sh_addr
;
563 /* This is the symbol it is referring to */
564 sym
= (Elf32_Sym
*)sechdrs
[symindex
].sh_addr
565 + ELF32_R_SYM(rel
[i
].r_info
);
566 if (!sym
->st_value
) {
567 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
568 me
->name
, strtab
+ sym
->st_name
);
571 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
572 dot
= (Elf32_Addr
)loc
& ~0x03;
575 addend
= rel
[i
].r_addend
;
578 switch (ELF32_R_TYPE(rel
[i
].r_info
)) {
579 case R_PARISC_PLABEL32
:
580 /* 32-bit function address */
581 /* no function descriptors... */
582 *loc
= fsel(val
, addend
);
585 /* direct 32-bit ref */
586 *loc
= fsel(val
, addend
);
588 case R_PARISC_DIR21L
:
589 /* left 21 bits of effective address */
590 val
= lrsel(val
, addend
);
591 *loc
= mask(*loc
, 21) | reassemble_21(val
);
593 case R_PARISC_DIR14R
:
594 /* right 14 bits of effective address */
595 val
= rrsel(val
, addend
);
596 *loc
= mask(*loc
, 14) | reassemble_14(val
);
598 case R_PARISC_SEGREL32
:
599 /* 32-bit segment relative address */
600 /* See note about special handling of SEGREL32 at
601 * the beginning of this file.
603 *loc
= fsel(val
, addend
);
605 case R_PARISC_DPREL21L
:
606 /* left 21 bit of relative address */
607 val
= lrsel(val
- dp
, addend
);
608 *loc
= mask(*loc
, 21) | reassemble_21(val
);
610 case R_PARISC_DPREL14R
:
611 /* right 14 bit of relative address */
612 val
= rrsel(val
- dp
, addend
);
613 *loc
= mask(*loc
, 14) | reassemble_14(val
);
615 case R_PARISC_PCREL17F
:
616 /* 17-bit PC relative address */
617 /* calculate direct call offset */
619 val
= (val
- dot
- 8)/4;
620 if (!RELOC_REACHABLE(val
, 17)) {
621 /* direct distance too far, create
622 * stub entry instead */
623 val
= get_stub(me
, sym
->st_value
, addend
,
624 ELF_STUB_DIRECT
, loc0
, targetsec
);
625 val
= (val
- dot
- 8)/4;
626 CHECK_RELOC(val
, 17);
628 *loc
= (*loc
& ~0x1f1ffd) | reassemble_17(val
);
630 case R_PARISC_PCREL22F
:
631 /* 22-bit PC relative address; only defined for pa20 */
632 /* calculate direct call offset */
634 val
= (val
- dot
- 8)/4;
635 if (!RELOC_REACHABLE(val
, 22)) {
636 /* direct distance too far, create
637 * stub entry instead */
638 val
= get_stub(me
, sym
->st_value
, addend
,
639 ELF_STUB_DIRECT
, loc0
, targetsec
);
640 val
= (val
- dot
- 8)/4;
641 CHECK_RELOC(val
, 22);
643 *loc
= (*loc
& ~0x3ff1ffd) | reassemble_22(val
);
647 printk(KERN_ERR
"module %s: Unknown relocation: %u\n",
648 me
->name
, ELF32_R_TYPE(rel
[i
].r_info
));
657 int apply_relocate_add(Elf_Shdr
*sechdrs
,
659 unsigned int symindex
,
664 Elf64_Rela
*rel
= (void *)sechdrs
[relsec
].sh_addr
;
672 unsigned int targetsec
= sechdrs
[relsec
].sh_info
;
674 DEBUGP("Applying relocate section %u to %u\n", relsec
,
676 for (i
= 0; i
< sechdrs
[relsec
].sh_size
/ sizeof(*rel
); i
++) {
677 /* This is where to make the change */
678 loc
= (void *)sechdrs
[targetsec
].sh_addr
680 /* This is the start of the target section */
681 loc0
= sechdrs
[targetsec
].sh_addr
;
682 /* This is the symbol it is referring to */
683 sym
= (Elf64_Sym
*)sechdrs
[symindex
].sh_addr
684 + ELF64_R_SYM(rel
[i
].r_info
);
685 if (!sym
->st_value
) {
686 printk(KERN_WARNING
"%s: Unknown symbol %s\n",
687 me
->name
, strtab
+ sym
->st_name
);
690 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
691 dot
= (Elf64_Addr
)loc
& ~0x03;
692 loc64
= (Elf64_Xword
*)loc
;
695 addend
= rel
[i
].r_addend
;
698 switch (ELF64_R_TYPE(rel
[i
].r_info
)) {
699 case R_PARISC_LTOFF21L
:
700 /* LT-relative; left 21 bits */
701 val
= get_got(me
, val
, addend
);
702 DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n",
703 strtab
+ sym
->st_name
,
706 *loc
= mask(*loc
, 21) | reassemble_21(val
);
708 case R_PARISC_LTOFF14R
:
709 /* L(ltoff(val+addend)) */
710 /* LT-relative; right 14 bits */
711 val
= get_got(me
, val
, addend
);
713 DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n",
714 strtab
+ sym
->st_name
,
716 *loc
= mask(*loc
, 14) | reassemble_14(val
);
718 case R_PARISC_PCREL22F
:
719 /* PC-relative; 22 bits */
720 DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
721 strtab
+ sym
->st_name
,
724 /* can we reach it locally? */
725 if (in_local(me
, (void *)val
)) {
726 /* this is the case where the symbol is local
727 * to the module, but in a different section,
728 * so stub the jump in case it's more than 22
730 val
= (val
- dot
- 8)/4;
731 if (!RELOC_REACHABLE(val
, 22)) {
732 /* direct distance too far, create
733 * stub entry instead */
734 val
= get_stub(me
, sym
->st_value
,
735 addend
, ELF_STUB_DIRECT
,
738 /* Ok, we can reach it directly. */
744 if (strncmp(strtab
+ sym
->st_name
, "$$", 2)
746 val
= get_stub(me
, val
, addend
, ELF_STUB_MILLI
,
749 val
= get_stub(me
, val
, addend
, ELF_STUB_GOT
,
752 DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
753 strtab
+ sym
->st_name
, loc
, sym
->st_value
,
755 val
= (val
- dot
- 8)/4;
756 CHECK_RELOC(val
, 22);
757 *loc
= (*loc
& ~0x3ff1ffd) | reassemble_22(val
);
760 /* 64-bit effective address */
761 *loc64
= val
+ addend
;
763 case R_PARISC_SEGREL32
:
764 /* 32-bit segment relative address */
765 /* See note about special handling of SEGREL32 at
766 * the beginning of this file.
768 *loc
= fsel(val
, addend
);
770 case R_PARISC_FPTR64
:
771 /* 64-bit function address */
772 if(in_local(me
, (void *)(val
+ addend
))) {
773 *loc64
= get_fdesc(me
, val
+addend
);
774 DEBUGP("FDESC for %s at %p points to %lx\n",
775 strtab
+ sym
->st_name
, *loc64
,
776 ((Elf_Fdesc
*)*loc64
)->addr
);
778 /* if the symbol is not local to this
779 * module then val+addend is a pointer
780 * to the function descriptor */
781 DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n",
782 strtab
+ sym
->st_name
,
784 *loc64
= val
+ addend
;
789 printk(KERN_ERR
"module %s: Unknown relocation: %Lu\n",
790 me
->name
, ELF64_R_TYPE(rel
[i
].r_info
));
799 register_unwind_table(struct module
*me
,
800 const Elf_Shdr
*sechdrs
)
802 unsigned char *table
, *end
;
805 if (!me
->arch
.unwind_section
)
808 table
= (unsigned char *)sechdrs
[me
->arch
.unwind_section
].sh_addr
;
809 end
= table
+ sechdrs
[me
->arch
.unwind_section
].sh_size
;
810 gp
= (Elf_Addr
)me
->module_core
+ me
->arch
.got_offset
;
812 DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
813 me
->arch
.unwind_section
, table
, end
, gp
);
814 me
->arch
.unwind
= unwind_table_add(me
->name
, 0, gp
, table
, end
);
818 deregister_unwind_table(struct module
*me
)
821 unwind_table_remove(me
->arch
.unwind
);
824 int module_finalize(const Elf_Ehdr
*hdr
,
825 const Elf_Shdr
*sechdrs
,
830 const char *strtab
= NULL
;
831 Elf_Sym
*newptr
, *oldptr
;
832 Elf_Shdr
*symhdr
= NULL
;
837 entry
= (Elf_Fdesc
*)me
->init
;
838 printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry
,
839 entry
->gp
, entry
->addr
);
840 addr
= (u32
*)entry
->addr
;
841 printk("INSNS: %x %x %x %x\n",
842 addr
[0], addr
[1], addr
[2], addr
[3]);
843 printk("got entries used %ld, gots max %ld\n"
844 "fdescs used %ld, fdescs max %ld\n",
845 me
->arch
.got_count
, me
->arch
.got_max
,
846 me
->arch
.fdesc_count
, me
->arch
.fdesc_max
);
849 register_unwind_table(me
, sechdrs
);
851 /* haven't filled in me->symtab yet, so have to find it
853 for (i
= 1; i
< hdr
->e_shnum
; i
++) {
854 if(sechdrs
[i
].sh_type
== SHT_SYMTAB
855 && (sechdrs
[i
].sh_flags
& SHF_ALLOC
)) {
856 int strindex
= sechdrs
[i
].sh_link
;
857 symhdr
= (Elf_Shdr
*)&sechdrs
[i
];
858 strtab
= (char *)sechdrs
[strindex
].sh_addr
;
863 DEBUGP("module %s: strtab %p, symhdr %p\n",
864 me
->name
, strtab
, symhdr
);
866 if(me
->arch
.got_count
> MAX_GOTS
) {
867 printk(KERN_ERR
"%s: Global Offset Table overflow (used %ld, allowed %d)\n",
868 me
->name
, me
->arch
.got_count
, MAX_GOTS
);
872 kfree(me
->arch
.section
);
873 me
->arch
.section
= NULL
;
875 /* no symbol table */
879 oldptr
= (void *)symhdr
->sh_addr
;
880 newptr
= oldptr
+ 1; /* we start counting at 1 */
881 nsyms
= symhdr
->sh_size
/ sizeof(Elf_Sym
);
882 DEBUGP("OLD num_symtab %lu\n", nsyms
);
884 for (i
= 1; i
< nsyms
; i
++) {
885 oldptr
++; /* note, count starts at 1 so preincrement */
886 if(strncmp(strtab
+ oldptr
->st_name
,
896 nsyms
= newptr
- (Elf_Sym
*)symhdr
->sh_addr
;
897 DEBUGP("NEW num_symtab %lu\n", nsyms
);
898 symhdr
->sh_size
= nsyms
* sizeof(Elf_Sym
);
902 void module_arch_cleanup(struct module
*mod
)
904 deregister_unwind_table(mod
);