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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* Kernel dynamically loadable module help for PARISC.
2 *
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
6 *
7 * Linux/PA-RISC Project (http://www.parisc-linux.org/)
8 * Copyright (C) 2003 Randolph Chung <tausq at debian . org>
Helge Dellerc298be72009-01-01 22:25:30 +01009 * Copyright (C) 2008 Helge Deller <deller@gmx.de>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 *
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.
16 *
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.
21 *
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
25 *
26 *
27 * Notes:
Helge Dellerc298be72009-01-01 22:25:30 +010028 * - 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.
40 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070041 * - SEGREL32 handling
42 * We are not doing SEGREL32 handling correctly. According to the ABI, we
43 * should do a value offset, like this:
Eric Biederman959ed3402006-09-29 02:00:06 -070044 * if (in_init(me, (void *)val))
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 * 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.
50 *
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.
55 */
56
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>
Helge Deller6891f8a2006-12-16 16:16:50 +010063#include <linux/bug.h>
James Bottomleyd7dd2ff2011-04-14 18:25:21 -050064#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090065#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
James Bottomleyd7dd2ff2011-04-14 18:25:21 -050067#include <asm/pgtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070068#include <asm/unwind.h>
69
70#if 0
71#define DEBUGP printk
72#else
73#define DEBUGP(fmt...)
74#endif
75
Helge Dellerc298be72009-01-01 22:25:30 +010076#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)
80
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#define CHECK_RELOC(val, bits) \
Helge Dellerc298be72009-01-01 22:25:30 +010082 if (!RELOC_REACHABLE(val, bits)) { \
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 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; \
86 }
87
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
John David Anglinb4f2e2a2009-08-02 12:34:08 +020092 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/* three functions to determine where in the module core
100 * or init pieces the location is */
Eric Biederman959ed3402006-09-29 02:00:06 -0700101static inline int in_init(struct module *me, void *loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
103 return (loc >= me->module_init &&
104 loc <= (me->module_init + me->init_size));
105}
106
Eric Biederman959ed3402006-09-29 02:00:06 -0700107static inline int in_core(struct module *me, void *loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108{
109 return (loc >= me->module_core &&
110 loc <= (me->module_core + me->core_size));
111}
112
Eric Biederman959ed3402006-09-29 02:00:06 -0700113static inline int in_local(struct module *me, void *loc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Eric Biederman959ed3402006-09-29 02:00:06 -0700115 return in_init(me, loc) || in_core(me, loc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116}
117
Helge Dellera8f44e32007-01-28 14:58:52 +0100118#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119struct got_entry {
120 Elf32_Addr addr;
121};
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123struct stub_entry {
124 Elf32_Word insns[2]; /* each stub entry has two insns */
125};
126#else
127struct got_entry {
128 Elf64_Addr addr;
129};
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131struct stub_entry {
132 Elf64_Word insns[4]; /* each stub entry has four insns */
133};
134#endif
135
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)))
148
149#define mask(x,sz) ((x) & ~((1<<(sz))-1))
150
151
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. */
John David Anglinb4f2e2a2009-08-02 12:34:08 +0200155static inline int sign_unext(int x, int len)
156{
157 int len_ones;
158
159 len_ones = (1 << len) - 1;
160 return x & len_ones;
161}
162
163static inline int low_sign_unext(int x, int len)
164{
165 int sign, temp;
166
167 sign = (x >> (len-1)) & 1;
168 temp = sign_unext(x, len-1);
169 return (temp << 1) | sign;
170}
171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172static inline int reassemble_14(int as14)
173{
174 return (((as14 & 0x1fff) << 1) |
175 ((as14 & 0x2000) >> 13));
176}
177
John David Anglinb4f2e2a2009-08-02 12:34:08 +0200178static inline int reassemble_16a(int as16)
179{
180 int s, t;
181
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);
186}
187
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189static inline int reassemble_17(int as17)
190{
191 return (((as17 & 0x10000) >> 16) |
192 ((as17 & 0x0f800) << 5) |
193 ((as17 & 0x00400) >> 8) |
194 ((as17 & 0x003ff) << 3));
195}
196
197static inline int reassemble_21(int as21)
198{
199 return (((as21 & 0x100000) >> 20) |
200 ((as21 & 0x0ffe00) >> 8) |
201 ((as21 & 0x000180) << 7) |
202 ((as21 & 0x00007c) << 14) |
203 ((as21 & 0x000003) << 12));
204}
205
206static inline int reassemble_22(int as22)
207{
208 return (((as22 & 0x200000) >> 21) |
209 ((as22 & 0x1f0000) << 5) |
210 ((as22 & 0x00f800) << 5) |
211 ((as22 & 0x000400) >> 8) |
212 ((as22 & 0x0003ff) << 3));
213}
214
215void *module_alloc(unsigned long size)
216{
James Bottomleyd7dd2ff2011-04-14 18:25:21 -0500217 /* using RWX means less protection for modules, but it's
218 * easier than trying to map the text, data, init_text and
219 * init_data correctly */
220 return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
221 GFP_KERNEL | __GFP_HIGHMEM,
Jianguo Wu40c3baa2013-11-12 15:07:27 -0800222 PAGE_KERNEL_RWX, NUMA_NO_NODE,
James Bottomleyd7dd2ff2011-04-14 18:25:21 -0500223 __builtin_return_address(0));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Helge Dellera8f44e32007-01-28 14:58:52 +0100226#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
228{
229 return 0;
230}
231
232static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
233{
234 return 0;
235}
236
237static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
238{
239 unsigned long cnt = 0;
240
241 for (; n > 0; n--, rela++)
242 {
243 switch (ELF32_R_TYPE(rela->r_info)) {
244 case R_PARISC_PCREL17F:
245 case R_PARISC_PCREL22F:
246 cnt++;
247 }
248 }
249
250 return cnt;
251}
252#else
253static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n)
254{
255 unsigned long cnt = 0;
256
257 for (; n > 0; n--, rela++)
258 {
259 switch (ELF64_R_TYPE(rela->r_info)) {
260 case R_PARISC_LTOFF21L:
261 case R_PARISC_LTOFF14R:
262 case R_PARISC_PCREL22F:
263 cnt++;
264 }
265 }
266
267 return cnt;
268}
269
270static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n)
271{
272 unsigned long cnt = 0;
273
274 for (; n > 0; n--, rela++)
275 {
276 switch (ELF64_R_TYPE(rela->r_info)) {
277 case R_PARISC_FPTR64:
278 cnt++;
279 }
280 }
281
282 return cnt;
283}
284
285static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
286{
287 unsigned long cnt = 0;
288
289 for (; n > 0; n--, rela++)
290 {
291 switch (ELF64_R_TYPE(rela->r_info)) {
292 case R_PARISC_PCREL22F:
293 cnt++;
294 }
295 }
296
297 return cnt;
298}
299#endif
300
301
302/* Free memory returned from module_alloc */
303void module_free(struct module *mod, void *module_region)
304{
Helge Dellerc298be72009-01-01 22:25:30 +0100305 kfree(mod->arch.section);
306 mod->arch.section = NULL;
307
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 vfree(module_region);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309}
310
Helge Dellerc298be72009-01-01 22:25:30 +0100311/* Additional bytes needed in front of individual sections */
312unsigned int arch_mod_section_prepend(struct module *mod,
313 unsigned int section)
314{
315 /* size needed for all stubs of this section (including
316 * one additional for correct alignment of the stubs) */
317 return (mod->arch.section[section].stub_entries + 1)
318 * sizeof(struct stub_entry);
319}
320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321#define CONST
322int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
323 CONST Elf_Shdr *sechdrs,
324 CONST char *secstrings,
325 struct module *me)
326{
Helge Dellerc298be72009-01-01 22:25:30 +0100327 unsigned long gots = 0, fdescs = 0, len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 unsigned int i;
329
Helge Dellerc298be72009-01-01 22:25:30 +0100330 len = hdr->e_shnum * sizeof(me->arch.section[0]);
331 me->arch.section = kzalloc(len, GFP_KERNEL);
332 if (!me->arch.section)
333 return -ENOMEM;
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 for (i = 1; i < hdr->e_shnum; i++) {
Helge Dellerc298be72009-01-01 22:25:30 +0100336 const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
Helge Dellerc298be72009-01-01 22:25:30 +0100338 unsigned int count, s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340 if (strncmp(secstrings + sechdrs[i].sh_name,
341 ".PARISC.unwind", 14) == 0)
342 me->arch.unwind_section = i;
343
344 if (sechdrs[i].sh_type != SHT_RELA)
345 continue;
346
347 /* some of these are not relevant for 32-bit/64-bit
348 * we leave them here to make the code common. the
349 * compiler will do its thing and optimize out the
350 * stuff we don't need
351 */
352 gots += count_gots(rels, nrels);
353 fdescs += count_fdescs(rels, nrels);
Helge Dellerc298be72009-01-01 22:25:30 +0100354
355 /* XXX: By sorting the relocs and finding duplicate entries
356 * we could reduce the number of necessary stubs and save
357 * some memory. */
358 count = count_stubs(rels, nrels);
359 if (!count)
360 continue;
361
362 /* so we need relocation stubs. reserve necessary memory. */
363 /* sh_info gives the section for which we need to add stubs. */
364 s = sechdrs[i].sh_info;
365
366 /* each code section should only have one relocation section */
367 WARN_ON(me->arch.section[s].stub_entries);
368
369 /* store number of stubs we need for this section */
370 me->arch.section[s].stub_entries += count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
372
373 /* align things a bit */
374 me->core_size = ALIGN(me->core_size, 16);
375 me->arch.got_offset = me->core_size;
376 me->core_size += gots * sizeof(struct got_entry);
377
378 me->core_size = ALIGN(me->core_size, 16);
379 me->arch.fdesc_offset = me->core_size;
380 me->core_size += fdescs * sizeof(Elf_Fdesc);
381
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 me->arch.got_max = gots;
383 me->arch.fdesc_max = fdescs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384
385 return 0;
386}
387
Helge Dellera8f44e32007-01-28 14:58:52 +0100388#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389static Elf64_Word get_got(struct module *me, unsigned long value, long addend)
390{
391 unsigned int i;
392 struct got_entry *got;
393
394 value += addend;
395
396 BUG_ON(value == 0);
397
398 got = me->module_core + me->arch.got_offset;
399 for (i = 0; got[i].addr; i++)
400 if (got[i].addr == value)
401 goto out;
402
403 BUG_ON(++me->arch.got_count > me->arch.got_max);
404
405 got[i].addr = value;
406 out:
407 DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry),
408 value);
409 return i * sizeof(struct got_entry);
410}
Helge Dellera8f44e32007-01-28 14:58:52 +0100411#endif /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412
Helge Dellera8f44e32007-01-28 14:58:52 +0100413#ifdef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414static Elf_Addr get_fdesc(struct module *me, unsigned long value)
415{
416 Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset;
417
418 if (!value) {
419 printk(KERN_ERR "%s: zero OPD requested!\n", me->name);
420 return 0;
421 }
422
423 /* Look for existing fdesc entry. */
424 while (fdesc->addr) {
425 if (fdesc->addr == value)
426 return (Elf_Addr)fdesc;
427 fdesc++;
428 }
429
430 BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max);
431
432 /* Create new one */
433 fdesc->addr = value;
434 fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset;
435 return (Elf_Addr)fdesc;
436}
Helge Dellera8f44e32007-01-28 14:58:52 +0100437#endif /* CONFIG_64BIT */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
James Bottomley6e1b95852006-06-23 14:15:20 -0600439enum elf_stub_type {
440 ELF_STUB_GOT,
441 ELF_STUB_MILLI,
442 ELF_STUB_DIRECT,
443};
444
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
Helge Dellerc298be72009-01-01 22:25:30 +0100446 enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct stub_entry *stub;
John David Anglinb4f2e2a2009-08-02 12:34:08 +0200449 int __maybe_unused d;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
Helge Dellerc298be72009-01-01 22:25:30 +0100451 /* initialize stub_offset to point in front of the section */
452 if (!me->arch.section[targetsec].stub_offset) {
453 loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
454 sizeof(struct stub_entry);
455 /* get correct alignment for the stubs */
456 loc0 = ALIGN(loc0, sizeof(struct stub_entry));
457 me->arch.section[targetsec].stub_offset = loc0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 }
459
Helge Dellerc298be72009-01-01 22:25:30 +0100460 /* get address of stub entry */
461 stub = (void *) me->arch.section[targetsec].stub_offset;
462 me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
463
464 /* do not write outside available stub area */
465 BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
466
467
Helge Dellera8f44e32007-01-28 14:58:52 +0100468#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469/* for 32-bit the stub looks like this:
470 * ldil L'XXX,%r1
471 * be,n R'XXX(%sr4,%r1)
472 */
473 //value = *(unsigned long *)((value + addend) & ~3); /* why? */
474
475 stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */
476 stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */
477
478 stub->insns[0] |= reassemble_21(lrsel(value, addend));
479 stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4);
480
481#else
James Bottomley6e1b95852006-06-23 14:15:20 -0600482/* for 64-bit we have three kinds of stubs:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 * for normal function calls:
484 * ldd 0(%dp),%dp
485 * ldd 10(%dp), %r1
486 * bve (%r1)
487 * ldd 18(%dp), %dp
488 *
489 * for millicode:
490 * ldil 0, %r1
491 * ldo 0(%r1), %r1
492 * ldd 10(%r1), %r1
493 * bve,n (%r1)
James Bottomley6e1b95852006-06-23 14:15:20 -0600494 *
495 * for direct branches (jumps between different section of the
496 * same module):
497 * ldil 0, %r1
498 * ldo 0(%r1), %r1
499 * bve,n (%r1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 */
James Bottomley6e1b95852006-06-23 14:15:20 -0600501 switch (stub_type) {
502 case ELF_STUB_GOT:
John David Anglinb4f2e2a2009-08-02 12:34:08 +0200503 d = get_got(me, value, addend);
504 if (d <= 15) {
505 /* Format 5 */
506 stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */
507 stub->insns[0] |= low_sign_unext(d, 5) << 16;
508 } else {
509 /* Format 3 */
510 stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */
511 stub->insns[0] |= reassemble_16a(d);
512 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */
514 stub->insns[2] = 0xe820d000; /* bve (%r1) */
515 stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */
James Bottomley6e1b95852006-06-23 14:15:20 -0600516 break;
517 case ELF_STUB_MILLI:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
519 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
520 stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */
521 stub->insns[3] = 0xe820d002; /* bve,n (%r1) */
522
523 stub->insns[0] |= reassemble_21(lrsel(value, addend));
524 stub->insns[1] |= reassemble_14(rrsel(value, addend));
James Bottomley6e1b95852006-06-23 14:15:20 -0600525 break;
526 case ELF_STUB_DIRECT:
527 stub->insns[0] = 0x20200000; /* ldil 0,%r1 */
528 stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */
529 stub->insns[2] = 0xe820d002; /* bve,n (%r1) */
530
531 stub->insns[0] |= reassemble_21(lrsel(value, addend));
532 stub->insns[1] |= reassemble_14(rrsel(value, addend));
533 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 }
James Bottomley6e1b95852006-06-23 14:15:20 -0600535
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536#endif
537
538 return (Elf_Addr)stub;
539}
540
Helge Dellera8f44e32007-01-28 14:58:52 +0100541#ifndef CONFIG_64BIT
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542int apply_relocate_add(Elf_Shdr *sechdrs,
543 const char *strtab,
544 unsigned int symindex,
545 unsigned int relsec,
546 struct module *me)
547{
548 int i;
549 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
550 Elf32_Sym *sym;
551 Elf32_Word *loc;
552 Elf32_Addr val;
553 Elf32_Sword addend;
554 Elf32_Addr dot;
Helge Dellerc298be72009-01-01 22:25:30 +0100555 Elf_Addr loc0;
556 unsigned int targetsec = sechdrs[relsec].sh_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 //unsigned long dp = (unsigned long)$global$;
558 register unsigned long dp asm ("r27");
559
560 DEBUGP("Applying relocate section %u to %u\n", relsec,
Helge Dellerc298be72009-01-01 22:25:30 +0100561 targetsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
563 /* This is where to make the change */
Helge Dellerc298be72009-01-01 22:25:30 +0100564 loc = (void *)sechdrs[targetsec].sh_addr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 + rel[i].r_offset;
Helge Dellerc298be72009-01-01 22:25:30 +0100566 /* This is the start of the target section */
567 loc0 = sechdrs[targetsec].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 /* This is the symbol it is referring to */
569 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
570 + ELF32_R_SYM(rel[i].r_info);
571 if (!sym->st_value) {
572 printk(KERN_WARNING "%s: Unknown symbol %s\n",
573 me->name, strtab + sym->st_name);
574 return -ENOENT;
575 }
576 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
577 dot = (Elf32_Addr)loc & ~0x03;
578
579 val = sym->st_value;
580 addend = rel[i].r_addend;
581
582#if 0
583#define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t :
584 DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n",
585 strtab + sym->st_name,
586 (uint32_t)loc, val, addend,
587 r(R_PARISC_PLABEL32)
588 r(R_PARISC_DIR32)
589 r(R_PARISC_DIR21L)
590 r(R_PARISC_DIR14R)
591 r(R_PARISC_SEGREL32)
592 r(R_PARISC_DPREL21L)
593 r(R_PARISC_DPREL14R)
594 r(R_PARISC_PCREL17F)
595 r(R_PARISC_PCREL22F)
596 "UNKNOWN");
597#undef r
598#endif
599
600 switch (ELF32_R_TYPE(rel[i].r_info)) {
601 case R_PARISC_PLABEL32:
602 /* 32-bit function address */
603 /* no function descriptors... */
604 *loc = fsel(val, addend);
605 break;
606 case R_PARISC_DIR32:
607 /* direct 32-bit ref */
608 *loc = fsel(val, addend);
609 break;
610 case R_PARISC_DIR21L:
611 /* left 21 bits of effective address */
612 val = lrsel(val, addend);
613 *loc = mask(*loc, 21) | reassemble_21(val);
614 break;
615 case R_PARISC_DIR14R:
616 /* right 14 bits of effective address */
617 val = rrsel(val, addend);
618 *loc = mask(*loc, 14) | reassemble_14(val);
619 break;
620 case R_PARISC_SEGREL32:
621 /* 32-bit segment relative address */
622 /* See note about special handling of SEGREL32 at
623 * the beginning of this file.
624 */
625 *loc = fsel(val, addend);
626 break;
627 case R_PARISC_DPREL21L:
628 /* left 21 bit of relative address */
629 val = lrsel(val - dp, addend);
630 *loc = mask(*loc, 21) | reassemble_21(val);
631 break;
632 case R_PARISC_DPREL14R:
633 /* right 14 bit of relative address */
634 val = rrsel(val - dp, addend);
635 *loc = mask(*loc, 14) | reassemble_14(val);
636 break;
637 case R_PARISC_PCREL17F:
638 /* 17-bit PC relative address */
Helge Dellerc298be72009-01-01 22:25:30 +0100639 /* calculate direct call offset */
640 val += addend;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 val = (val - dot - 8)/4;
Helge Dellerc298be72009-01-01 22:25:30 +0100642 if (!RELOC_REACHABLE(val, 17)) {
643 /* direct distance too far, create
644 * stub entry instead */
645 val = get_stub(me, sym->st_value, addend,
646 ELF_STUB_DIRECT, loc0, targetsec);
647 val = (val - dot - 8)/4;
648 CHECK_RELOC(val, 17);
649 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 *loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
651 break;
652 case R_PARISC_PCREL22F:
653 /* 22-bit PC relative address; only defined for pa20 */
Helge Dellerc298be72009-01-01 22:25:30 +0100654 /* calculate direct call offset */
655 val += addend;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 val = (val - dot - 8)/4;
Helge Dellerc298be72009-01-01 22:25:30 +0100657 if (!RELOC_REACHABLE(val, 22)) {
658 /* direct distance too far, create
659 * stub entry instead */
660 val = get_stub(me, sym->st_value, addend,
661 ELF_STUB_DIRECT, loc0, targetsec);
662 val = (val - dot - 8)/4;
663 CHECK_RELOC(val, 22);
664 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
666 break;
667
668 default:
669 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
670 me->name, ELF32_R_TYPE(rel[i].r_info));
671 return -ENOEXEC;
672 }
673 }
674
675 return 0;
676}
677
678#else
679int apply_relocate_add(Elf_Shdr *sechdrs,
680 const char *strtab,
681 unsigned int symindex,
682 unsigned int relsec,
683 struct module *me)
684{
685 int i;
686 Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
687 Elf64_Sym *sym;
688 Elf64_Word *loc;
689 Elf64_Xword *loc64;
690 Elf64_Addr val;
691 Elf64_Sxword addend;
692 Elf64_Addr dot;
Helge Dellerc298be72009-01-01 22:25:30 +0100693 Elf_Addr loc0;
694 unsigned int targetsec = sechdrs[relsec].sh_info;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 DEBUGP("Applying relocate section %u to %u\n", relsec,
Helge Dellerc298be72009-01-01 22:25:30 +0100697 targetsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
699 /* This is where to make the change */
Helge Dellerc298be72009-01-01 22:25:30 +0100700 loc = (void *)sechdrs[targetsec].sh_addr
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 + rel[i].r_offset;
Helge Dellerc298be72009-01-01 22:25:30 +0100702 /* This is the start of the target section */
703 loc0 = sechdrs[targetsec].sh_addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704 /* This is the symbol it is referring to */
705 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
706 + ELF64_R_SYM(rel[i].r_info);
707 if (!sym->st_value) {
708 printk(KERN_WARNING "%s: Unknown symbol %s\n",
709 me->name, strtab + sym->st_name);
710 return -ENOENT;
711 }
712 //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03;
713 dot = (Elf64_Addr)loc & ~0x03;
714 loc64 = (Elf64_Xword *)loc;
715
716 val = sym->st_value;
717 addend = rel[i].r_addend;
718
719#if 0
720#define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t :
721 printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n",
722 strtab + sym->st_name,
723 loc, val, addend,
724 r(R_PARISC_LTOFF14R)
725 r(R_PARISC_LTOFF21L)
726 r(R_PARISC_PCREL22F)
727 r(R_PARISC_DIR64)
728 r(R_PARISC_SEGREL32)
729 r(R_PARISC_FPTR64)
730 "UNKNOWN");
731#undef r
732#endif
733
734 switch (ELF64_R_TYPE(rel[i].r_info)) {
735 case R_PARISC_LTOFF21L:
736 /* LT-relative; left 21 bits */
737 val = get_got(me, val, addend);
738 DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n",
739 strtab + sym->st_name,
740 loc, val);
741 val = lrsel(val, 0);
742 *loc = mask(*loc, 21) | reassemble_21(val);
743 break;
744 case R_PARISC_LTOFF14R:
745 /* L(ltoff(val+addend)) */
746 /* LT-relative; right 14 bits */
747 val = get_got(me, val, addend);
748 val = rrsel(val, 0);
749 DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n",
750 strtab + sym->st_name,
751 loc, val);
752 *loc = mask(*loc, 14) | reassemble_14(val);
753 break;
754 case R_PARISC_PCREL22F:
755 /* PC-relative; 22 bits */
756 DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
757 strtab + sym->st_name,
758 loc, val);
Helge Dellerc298be72009-01-01 22:25:30 +0100759 val += addend;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 /* can we reach it locally? */
Helge Dellerc298be72009-01-01 22:25:30 +0100761 if (in_local(me, (void *)val)) {
762 /* this is the case where the symbol is local
763 * to the module, but in a different section,
764 * so stub the jump in case it's more than 22
765 * bits away */
766 val = (val - dot - 8)/4;
767 if (!RELOC_REACHABLE(val, 22)) {
768 /* direct distance too far, create
769 * stub entry instead */
770 val = get_stub(me, sym->st_value,
771 addend, ELF_STUB_DIRECT,
772 loc0, targetsec);
773 } else {
774 /* Ok, we can reach it directly. */
775 val = sym->st_value;
776 val += addend;
777 }
778 } else {
779 val = sym->st_value;
780 if (strncmp(strtab + sym->st_name, "$$", 2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 == 0)
James Bottomley6e1b95852006-06-23 14:15:20 -0600782 val = get_stub(me, val, addend, ELF_STUB_MILLI,
Helge Dellerc298be72009-01-01 22:25:30 +0100783 loc0, targetsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 else
James Bottomley6e1b95852006-06-23 14:15:20 -0600785 val = get_stub(me, val, addend, ELF_STUB_GOT,
Helge Dellerc298be72009-01-01 22:25:30 +0100786 loc0, targetsec);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 }
788 DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
789 strtab + sym->st_name, loc, sym->st_value,
790 addend, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 val = (val - dot - 8)/4;
Helge Dellerc298be72009-01-01 22:25:30 +0100792 CHECK_RELOC(val, 22);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
794 break;
795 case R_PARISC_DIR64:
796 /* 64-bit effective address */
797 *loc64 = val + addend;
798 break;
799 case R_PARISC_SEGREL32:
800 /* 32-bit segment relative address */
801 /* See note about special handling of SEGREL32 at
802 * the beginning of this file.
803 */
804 *loc = fsel(val, addend);
805 break;
806 case R_PARISC_FPTR64:
807 /* 64-bit function address */
Eric Biederman959ed3402006-09-29 02:00:06 -0700808 if(in_local(me, (void *)(val + addend))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 *loc64 = get_fdesc(me, val+addend);
810 DEBUGP("FDESC for %s at %p points to %lx\n",
811 strtab + sym->st_name, *loc64,
812 ((Elf_Fdesc *)*loc64)->addr);
813 } else {
814 /* if the symbol is not local to this
815 * module then val+addend is a pointer
816 * to the function descriptor */
817 DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n",
818 strtab + sym->st_name,
819 loc, val);
820 *loc64 = val + addend;
821 }
822 break;
823
824 default:
825 printk(KERN_ERR "module %s: Unknown relocation: %Lu\n",
826 me->name, ELF64_R_TYPE(rel[i].r_info));
827 return -ENOEXEC;
828 }
829 }
830 return 0;
831}
832#endif
833
834static void
835register_unwind_table(struct module *me,
836 const Elf_Shdr *sechdrs)
837{
838 unsigned char *table, *end;
839 unsigned long gp;
840
841 if (!me->arch.unwind_section)
842 return;
843
844 table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr;
845 end = table + sechdrs[me->arch.unwind_section].sh_size;
846 gp = (Elf_Addr)me->module_core + me->arch.got_offset;
847
848 DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n",
849 me->arch.unwind_section, table, end, gp);
850 me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end);
851}
852
853static void
854deregister_unwind_table(struct module *me)
855{
856 if (me->arch.unwind)
857 unwind_table_remove(me->arch.unwind);
858}
859
860int module_finalize(const Elf_Ehdr *hdr,
861 const Elf_Shdr *sechdrs,
862 struct module *me)
863{
864 int i;
865 unsigned long nsyms;
866 const char *strtab = NULL;
867 Elf_Sym *newptr, *oldptr;
868 Elf_Shdr *symhdr = NULL;
869#ifdef DEBUG
870 Elf_Fdesc *entry;
871 u32 *addr;
872
873 entry = (Elf_Fdesc *)me->init;
874 printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry,
875 entry->gp, entry->addr);
876 addr = (u32 *)entry->addr;
877 printk("INSNS: %x %x %x %x\n",
878 addr[0], addr[1], addr[2], addr[3]);
Helge Dellerc298be72009-01-01 22:25:30 +0100879 printk("got entries used %ld, gots max %ld\n"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880 "fdescs used %ld, fdescs max %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 me->arch.got_count, me->arch.got_max,
882 me->arch.fdesc_count, me->arch.fdesc_max);
883#endif
884
885 register_unwind_table(me, sechdrs);
886
887 /* haven't filled in me->symtab yet, so have to find it
888 * ourselves */
889 for (i = 1; i < hdr->e_shnum; i++) {
890 if(sechdrs[i].sh_type == SHT_SYMTAB
Julia Lawallfe579c692009-08-04 22:27:07 +0200891 && (sechdrs[i].sh_flags & SHF_ALLOC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 int strindex = sechdrs[i].sh_link;
893 /* FIXME: AWFUL HACK
894 * The cast is to drop the const from
895 * the sechdrs pointer */
896 symhdr = (Elf_Shdr *)&sechdrs[i];
897 strtab = (char *)sechdrs[strindex].sh_addr;
898 break;
899 }
900 }
901
902 DEBUGP("module %s: strtab %p, symhdr %p\n",
903 me->name, strtab, symhdr);
904
905 if(me->arch.got_count > MAX_GOTS) {
Helge Dellerf8fc18a2006-10-18 21:44:30 +0200906 printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n",
907 me->name, me->arch.got_count, MAX_GOTS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 return -EINVAL;
909 }
Helge Dellerc298be72009-01-01 22:25:30 +0100910
911 kfree(me->arch.section);
912 me->arch.section = NULL;
913
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 /* no symbol table */
915 if(symhdr == NULL)
916 return 0;
917
918 oldptr = (void *)symhdr->sh_addr;
919 newptr = oldptr + 1; /* we start counting at 1 */
920 nsyms = symhdr->sh_size / sizeof(Elf_Sym);
921 DEBUGP("OLD num_symtab %lu\n", nsyms);
922
923 for (i = 1; i < nsyms; i++) {
924 oldptr++; /* note, count starts at 1 so preincrement */
925 if(strncmp(strtab + oldptr->st_name,
926 ".L", 2) == 0)
927 continue;
928
929 if(newptr != oldptr)
930 *newptr++ = *oldptr;
931 else
932 newptr++;
933
934 }
935 nsyms = newptr - (Elf_Sym *)symhdr->sh_addr;
936 DEBUGP("NEW num_symtab %lu\n", nsyms);
937 symhdr->sh_size = nsyms * sizeof(Elf_Sym);
Linus Torvalds53363772010-10-05 11:29:27 -0700938 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939}
940
941void module_arch_cleanup(struct module *mod)
942{
943 deregister_unwind_table(mod);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944}