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Commit | Line | Data |
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1da177e4 LT |
1 | /* 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> | |
c298be74 | 9 | * Copyright (C) 2008 Helge Deller <deller@gmx.de> |
1da177e4 LT |
10 | * |
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: | |
c298be74 HD |
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. | |
40 | * | |
1da177e4 LT |
41 | * - SEGREL32 handling |
42 | * We are not doing SEGREL32 handling correctly. According to the ABI, we | |
43 | * should do a value offset, like this: | |
959ed340 | 44 | * if (in_init(me, (void *)val)) |
1da177e4 LT |
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. | |
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> | |
6891f8a1 | 63 | #include <linux/bug.h> |
5a0e3ad6 | 64 | #include <linux/slab.h> |
1da177e4 LT |
65 | |
66 | #include <asm/unwind.h> | |
67 | ||
68 | #if 0 | |
69 | #define DEBUGP printk | |
70 | #else | |
71 | #define DEBUGP(fmt...) | |
72 | #endif | |
73 | ||
c298be74 HD |
74 | #define RELOC_REACHABLE(val, bits) \ |
75 | (( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \ | |
76 | ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \ | |
77 | 0 : 1) | |
78 | ||
1da177e4 | 79 | #define CHECK_RELOC(val, bits) \ |
c298be74 | 80 | if (!RELOC_REACHABLE(val, bits)) { \ |
1da177e4 LT |
81 | printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \ |
82 | me->name, strtab + sym->st_name, (unsigned long)val, bits); \ | |
83 | return -ENOEXEC; \ | |
84 | } | |
85 | ||
86 | /* Maximum number of GOT entries. We use a long displacement ldd from | |
87 | * the bottom of the table, which has a maximum signed displacement of | |
88 | * 0x3fff; however, since we're only going forward, this becomes | |
89 | * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have | |
b4f2e2ad JDA |
90 | * at most 1023 entries. |
91 | * To overcome this 14bit displacement with some kernel modules, we'll | |
92 | * use instead the unusal 16bit displacement method (see reassemble_16a) | |
93 | * which gives us a maximum positive displacement of 0x7fff, and as such | |
94 | * allows us to allocate up to 4095 GOT entries. */ | |
95 | #define MAX_GOTS 4095 | |
1da177e4 LT |
96 | |
97 | /* three functions to determine where in the module core | |
98 | * or init pieces the location is */ | |
959ed340 | 99 | static inline int in_init(struct module *me, void *loc) |
1da177e4 LT |
100 | { |
101 | return (loc >= me->module_init && | |
102 | loc <= (me->module_init + me->init_size)); | |
103 | } | |
104 | ||
959ed340 | 105 | static inline int in_core(struct module *me, void *loc) |
1da177e4 LT |
106 | { |
107 | return (loc >= me->module_core && | |
108 | loc <= (me->module_core + me->core_size)); | |
109 | } | |
110 | ||
959ed340 | 111 | static inline int in_local(struct module *me, void *loc) |
1da177e4 | 112 | { |
959ed340 | 113 | return in_init(me, loc) || in_core(me, loc); |
1da177e4 LT |
114 | } |
115 | ||
a8f44e38 | 116 | #ifndef CONFIG_64BIT |
1da177e4 LT |
117 | struct got_entry { |
118 | Elf32_Addr addr; | |
119 | }; | |
120 | ||
1da177e4 LT |
121 | struct stub_entry { |
122 | Elf32_Word insns[2]; /* each stub entry has two insns */ | |
123 | }; | |
124 | #else | |
125 | struct got_entry { | |
126 | Elf64_Addr addr; | |
127 | }; | |
128 | ||
1da177e4 LT |
129 | struct stub_entry { |
130 | Elf64_Word insns[4]; /* each stub entry has four insns */ | |
131 | }; | |
132 | #endif | |
133 | ||
134 | /* Field selection types defined by hppa */ | |
135 | #define rnd(x) (((x)+0x1000)&~0x1fff) | |
136 | /* fsel: full 32 bits */ | |
137 | #define fsel(v,a) ((v)+(a)) | |
138 | /* lsel: select left 21 bits */ | |
139 | #define lsel(v,a) (((v)+(a))>>11) | |
140 | /* rsel: select right 11 bits */ | |
141 | #define rsel(v,a) (((v)+(a))&0x7ff) | |
142 | /* lrsel with rounding of addend to nearest 8k */ | |
143 | #define lrsel(v,a) (((v)+rnd(a))>>11) | |
144 | /* rrsel with rounding of addend to nearest 8k */ | |
145 | #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a))) | |
146 | ||
147 | #define mask(x,sz) ((x) & ~((1<<(sz))-1)) | |
148 | ||
149 | ||
150 | /* The reassemble_* functions prepare an immediate value for | |
151 | insertion into an opcode. pa-risc uses all sorts of weird bitfields | |
152 | in the instruction to hold the value. */ | |
b4f2e2ad JDA |
153 | static inline int sign_unext(int x, int len) |
154 | { | |
155 | int len_ones; | |
156 | ||
157 | len_ones = (1 << len) - 1; | |
158 | return x & len_ones; | |
159 | } | |
160 | ||
161 | static inline int low_sign_unext(int x, int len) | |
162 | { | |
163 | int sign, temp; | |
164 | ||
165 | sign = (x >> (len-1)) & 1; | |
166 | temp = sign_unext(x, len-1); | |
167 | return (temp << 1) | sign; | |
168 | } | |
169 | ||
1da177e4 LT |
170 | static inline int reassemble_14(int as14) |
171 | { | |
172 | return (((as14 & 0x1fff) << 1) | | |
173 | ((as14 & 0x2000) >> 13)); | |
174 | } | |
175 | ||
b4f2e2ad JDA |
176 | static inline int reassemble_16a(int as16) |
177 | { | |
178 | int s, t; | |
179 | ||
180 | /* Unusual 16-bit encoding, for wide mode only. */ | |
181 | t = (as16 << 1) & 0xffff; | |
182 | s = (as16 & 0x8000); | |
183 | return (t ^ s ^ (s >> 1)) | (s >> 15); | |
184 | } | |
185 | ||
186 | ||
1da177e4 LT |
187 | static inline int reassemble_17(int as17) |
188 | { | |
189 | return (((as17 & 0x10000) >> 16) | | |
190 | ((as17 & 0x0f800) << 5) | | |
191 | ((as17 & 0x00400) >> 8) | | |
192 | ((as17 & 0x003ff) << 3)); | |
193 | } | |
194 | ||
195 | static inline int reassemble_21(int as21) | |
196 | { | |
197 | return (((as21 & 0x100000) >> 20) | | |
198 | ((as21 & 0x0ffe00) >> 8) | | |
199 | ((as21 & 0x000180) << 7) | | |
200 | ((as21 & 0x00007c) << 14) | | |
201 | ((as21 & 0x000003) << 12)); | |
202 | } | |
203 | ||
204 | static inline int reassemble_22(int as22) | |
205 | { | |
206 | return (((as22 & 0x200000) >> 21) | | |
207 | ((as22 & 0x1f0000) << 5) | | |
208 | ((as22 & 0x00f800) << 5) | | |
209 | ((as22 & 0x000400) >> 8) | | |
210 | ((as22 & 0x0003ff) << 3)); | |
211 | } | |
212 | ||
213 | void *module_alloc(unsigned long size) | |
214 | { | |
215 | if (size == 0) | |
216 | return NULL; | |
217 | return vmalloc(size); | |
218 | } | |
219 | ||
a8f44e38 | 220 | #ifndef CONFIG_64BIT |
1da177e4 LT |
221 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) |
222 | { | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) | |
227 | { | |
228 | return 0; | |
229 | } | |
230 | ||
231 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) | |
232 | { | |
233 | unsigned long cnt = 0; | |
234 | ||
235 | for (; n > 0; n--, rela++) | |
236 | { | |
237 | switch (ELF32_R_TYPE(rela->r_info)) { | |
238 | case R_PARISC_PCREL17F: | |
239 | case R_PARISC_PCREL22F: | |
240 | cnt++; | |
241 | } | |
242 | } | |
243 | ||
244 | return cnt; | |
245 | } | |
246 | #else | |
247 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) | |
248 | { | |
249 | unsigned long cnt = 0; | |
250 | ||
251 | for (; n > 0; n--, rela++) | |
252 | { | |
253 | switch (ELF64_R_TYPE(rela->r_info)) { | |
254 | case R_PARISC_LTOFF21L: | |
255 | case R_PARISC_LTOFF14R: | |
256 | case R_PARISC_PCREL22F: | |
257 | cnt++; | |
258 | } | |
259 | } | |
260 | ||
261 | return cnt; | |
262 | } | |
263 | ||
264 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) | |
265 | { | |
266 | unsigned long cnt = 0; | |
267 | ||
268 | for (; n > 0; n--, rela++) | |
269 | { | |
270 | switch (ELF64_R_TYPE(rela->r_info)) { | |
271 | case R_PARISC_FPTR64: | |
272 | cnt++; | |
273 | } | |
274 | } | |
275 | ||
276 | return cnt; | |
277 | } | |
278 | ||
279 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) | |
280 | { | |
281 | unsigned long cnt = 0; | |
282 | ||
283 | for (; n > 0; n--, rela++) | |
284 | { | |
285 | switch (ELF64_R_TYPE(rela->r_info)) { | |
286 | case R_PARISC_PCREL22F: | |
287 | cnt++; | |
288 | } | |
289 | } | |
290 | ||
291 | return cnt; | |
292 | } | |
293 | #endif | |
294 | ||
295 | ||
296 | /* Free memory returned from module_alloc */ | |
297 | void module_free(struct module *mod, void *module_region) | |
298 | { | |
c298be74 HD |
299 | kfree(mod->arch.section); |
300 | mod->arch.section = NULL; | |
301 | ||
1da177e4 | 302 | vfree(module_region); |
1da177e4 LT |
303 | } |
304 | ||
c298be74 HD |
305 | /* Additional bytes needed in front of individual sections */ |
306 | unsigned int arch_mod_section_prepend(struct module *mod, | |
307 | unsigned int section) | |
308 | { | |
309 | /* size needed for all stubs of this section (including | |
310 | * one additional for correct alignment of the stubs) */ | |
311 | return (mod->arch.section[section].stub_entries + 1) | |
312 | * sizeof(struct stub_entry); | |
313 | } | |
314 | ||
1da177e4 LT |
315 | #define CONST |
316 | int module_frob_arch_sections(CONST Elf_Ehdr *hdr, | |
317 | CONST Elf_Shdr *sechdrs, | |
318 | CONST char *secstrings, | |
319 | struct module *me) | |
320 | { | |
c298be74 | 321 | unsigned long gots = 0, fdescs = 0, len; |
1da177e4 LT |
322 | unsigned int i; |
323 | ||
c298be74 HD |
324 | len = hdr->e_shnum * sizeof(me->arch.section[0]); |
325 | me->arch.section = kzalloc(len, GFP_KERNEL); | |
326 | if (!me->arch.section) | |
327 | return -ENOMEM; | |
328 | ||
1da177e4 | 329 | for (i = 1; i < hdr->e_shnum; i++) { |
c298be74 | 330 | const Elf_Rela *rels = (void *)sechdrs[i].sh_addr; |
1da177e4 | 331 | unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels); |
c298be74 | 332 | unsigned int count, s; |
1da177e4 LT |
333 | |
334 | if (strncmp(secstrings + sechdrs[i].sh_name, | |
335 | ".PARISC.unwind", 14) == 0) | |
336 | me->arch.unwind_section = i; | |
337 | ||
338 | if (sechdrs[i].sh_type != SHT_RELA) | |
339 | continue; | |
340 | ||
341 | /* some of these are not relevant for 32-bit/64-bit | |
342 | * we leave them here to make the code common. the | |
343 | * compiler will do its thing and optimize out the | |
344 | * stuff we don't need | |
345 | */ | |
346 | gots += count_gots(rels, nrels); | |
347 | fdescs += count_fdescs(rels, nrels); | |
c298be74 HD |
348 | |
349 | /* XXX: By sorting the relocs and finding duplicate entries | |
350 | * we could reduce the number of necessary stubs and save | |
351 | * some memory. */ | |
352 | count = count_stubs(rels, nrels); | |
353 | if (!count) | |
354 | continue; | |
355 | ||
356 | /* so we need relocation stubs. reserve necessary memory. */ | |
357 | /* sh_info gives the section for which we need to add stubs. */ | |
358 | s = sechdrs[i].sh_info; | |
359 | ||
360 | /* each code section should only have one relocation section */ | |
361 | WARN_ON(me->arch.section[s].stub_entries); | |
362 | ||
363 | /* store number of stubs we need for this section */ | |
364 | me->arch.section[s].stub_entries += count; | |
1da177e4 LT |
365 | } |
366 | ||
367 | /* align things a bit */ | |
368 | me->core_size = ALIGN(me->core_size, 16); | |
369 | me->arch.got_offset = me->core_size; | |
370 | me->core_size += gots * sizeof(struct got_entry); | |
371 | ||
372 | me->core_size = ALIGN(me->core_size, 16); | |
373 | me->arch.fdesc_offset = me->core_size; | |
374 | me->core_size += fdescs * sizeof(Elf_Fdesc); | |
375 | ||
1da177e4 LT |
376 | me->arch.got_max = gots; |
377 | me->arch.fdesc_max = fdescs; | |
1da177e4 LT |
378 | |
379 | return 0; | |
380 | } | |
381 | ||
a8f44e38 | 382 | #ifdef CONFIG_64BIT |
1da177e4 LT |
383 | static Elf64_Word get_got(struct module *me, unsigned long value, long addend) |
384 | { | |
385 | unsigned int i; | |
386 | struct got_entry *got; | |
387 | ||
388 | value += addend; | |
389 | ||
390 | BUG_ON(value == 0); | |
391 | ||
392 | got = me->module_core + me->arch.got_offset; | |
393 | for (i = 0; got[i].addr; i++) | |
394 | if (got[i].addr == value) | |
395 | goto out; | |
396 | ||
397 | BUG_ON(++me->arch.got_count > me->arch.got_max); | |
398 | ||
399 | got[i].addr = value; | |
400 | out: | |
401 | DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry), | |
402 | value); | |
403 | return i * sizeof(struct got_entry); | |
404 | } | |
a8f44e38 | 405 | #endif /* CONFIG_64BIT */ |
1da177e4 | 406 | |
a8f44e38 | 407 | #ifdef CONFIG_64BIT |
1da177e4 LT |
408 | static Elf_Addr get_fdesc(struct module *me, unsigned long value) |
409 | { | |
410 | Elf_Fdesc *fdesc = me->module_core + me->arch.fdesc_offset; | |
411 | ||
412 | if (!value) { | |
413 | printk(KERN_ERR "%s: zero OPD requested!\n", me->name); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | /* Look for existing fdesc entry. */ | |
418 | while (fdesc->addr) { | |
419 | if (fdesc->addr == value) | |
420 | return (Elf_Addr)fdesc; | |
421 | fdesc++; | |
422 | } | |
423 | ||
424 | BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max); | |
425 | ||
426 | /* Create new one */ | |
427 | fdesc->addr = value; | |
428 | fdesc->gp = (Elf_Addr)me->module_core + me->arch.got_offset; | |
429 | return (Elf_Addr)fdesc; | |
430 | } | |
a8f44e38 | 431 | #endif /* CONFIG_64BIT */ |
1da177e4 | 432 | |
6e1b9585 JB |
433 | enum elf_stub_type { |
434 | ELF_STUB_GOT, | |
435 | ELF_STUB_MILLI, | |
436 | ELF_STUB_DIRECT, | |
437 | }; | |
438 | ||
1da177e4 | 439 | static Elf_Addr get_stub(struct module *me, unsigned long value, long addend, |
c298be74 | 440 | enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec) |
1da177e4 | 441 | { |
1da177e4 | 442 | struct stub_entry *stub; |
b4f2e2ad | 443 | int __maybe_unused d; |
1da177e4 | 444 | |
c298be74 HD |
445 | /* initialize stub_offset to point in front of the section */ |
446 | if (!me->arch.section[targetsec].stub_offset) { | |
447 | loc0 -= (me->arch.section[targetsec].stub_entries + 1) * | |
448 | sizeof(struct stub_entry); | |
449 | /* get correct alignment for the stubs */ | |
450 | loc0 = ALIGN(loc0, sizeof(struct stub_entry)); | |
451 | me->arch.section[targetsec].stub_offset = loc0; | |
1da177e4 LT |
452 | } |
453 | ||
c298be74 HD |
454 | /* get address of stub entry */ |
455 | stub = (void *) me->arch.section[targetsec].stub_offset; | |
456 | me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry); | |
457 | ||
458 | /* do not write outside available stub area */ | |
459 | BUG_ON(0 == me->arch.section[targetsec].stub_entries--); | |
460 | ||
461 | ||
a8f44e38 | 462 | #ifndef CONFIG_64BIT |
1da177e4 LT |
463 | /* for 32-bit the stub looks like this: |
464 | * ldil L'XXX,%r1 | |
465 | * be,n R'XXX(%sr4,%r1) | |
466 | */ | |
467 | //value = *(unsigned long *)((value + addend) & ~3); /* why? */ | |
468 | ||
469 | stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */ | |
470 | stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */ | |
471 | ||
472 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
473 | stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4); | |
474 | ||
475 | #else | |
6e1b9585 | 476 | /* for 64-bit we have three kinds of stubs: |
1da177e4 LT |
477 | * for normal function calls: |
478 | * ldd 0(%dp),%dp | |
479 | * ldd 10(%dp), %r1 | |
480 | * bve (%r1) | |
481 | * ldd 18(%dp), %dp | |
482 | * | |
483 | * for millicode: | |
484 | * ldil 0, %r1 | |
485 | * ldo 0(%r1), %r1 | |
486 | * ldd 10(%r1), %r1 | |
487 | * bve,n (%r1) | |
6e1b9585 JB |
488 | * |
489 | * for direct branches (jumps between different section of the | |
490 | * same module): | |
491 | * ldil 0, %r1 | |
492 | * ldo 0(%r1), %r1 | |
493 | * bve,n (%r1) | |
1da177e4 | 494 | */ |
6e1b9585 JB |
495 | switch (stub_type) { |
496 | case ELF_STUB_GOT: | |
b4f2e2ad JDA |
497 | d = get_got(me, value, addend); |
498 | if (d <= 15) { | |
499 | /* Format 5 */ | |
500 | stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */ | |
501 | stub->insns[0] |= low_sign_unext(d, 5) << 16; | |
502 | } else { | |
503 | /* Format 3 */ | |
504 | stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */ | |
505 | stub->insns[0] |= reassemble_16a(d); | |
506 | } | |
1da177e4 LT |
507 | stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */ |
508 | stub->insns[2] = 0xe820d000; /* bve (%r1) */ | |
509 | stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */ | |
6e1b9585 JB |
510 | break; |
511 | case ELF_STUB_MILLI: | |
1da177e4 LT |
512 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ |
513 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
514 | stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */ | |
515 | stub->insns[3] = 0xe820d002; /* bve,n (%r1) */ | |
516 | ||
517 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
518 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
6e1b9585 JB |
519 | break; |
520 | case ELF_STUB_DIRECT: | |
521 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ | |
522 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
523 | stub->insns[2] = 0xe820d002; /* bve,n (%r1) */ | |
524 | ||
525 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
526 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
527 | break; | |
1da177e4 | 528 | } |
6e1b9585 | 529 | |
1da177e4 LT |
530 | #endif |
531 | ||
532 | return (Elf_Addr)stub; | |
533 | } | |
534 | ||
535 | int apply_relocate(Elf_Shdr *sechdrs, | |
536 | const char *strtab, | |
537 | unsigned int symindex, | |
538 | unsigned int relsec, | |
539 | struct module *me) | |
540 | { | |
541 | /* parisc should not need this ... */ | |
542 | printk(KERN_ERR "module %s: RELOCATION unsupported\n", | |
543 | me->name); | |
544 | return -ENOEXEC; | |
545 | } | |
546 | ||
a8f44e38 | 547 | #ifndef CONFIG_64BIT |
1da177e4 LT |
548 | int apply_relocate_add(Elf_Shdr *sechdrs, |
549 | const char *strtab, | |
550 | unsigned int symindex, | |
551 | unsigned int relsec, | |
552 | struct module *me) | |
553 | { | |
554 | int i; | |
555 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
556 | Elf32_Sym *sym; | |
557 | Elf32_Word *loc; | |
558 | Elf32_Addr val; | |
559 | Elf32_Sword addend; | |
560 | Elf32_Addr dot; | |
c298be74 HD |
561 | Elf_Addr loc0; |
562 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 LT |
563 | //unsigned long dp = (unsigned long)$global$; |
564 | register unsigned long dp asm ("r27"); | |
565 | ||
566 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
c298be74 | 567 | targetsec); |
1da177e4 LT |
568 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
569 | /* This is where to make the change */ | |
c298be74 | 570 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 571 | + rel[i].r_offset; |
c298be74 HD |
572 | /* This is the start of the target section */ |
573 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
574 | /* This is the symbol it is referring to */ |
575 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
576 | + ELF32_R_SYM(rel[i].r_info); | |
577 | if (!sym->st_value) { | |
578 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
579 | me->name, strtab + sym->st_name); | |
580 | return -ENOENT; | |
581 | } | |
582 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; | |
583 | dot = (Elf32_Addr)loc & ~0x03; | |
584 | ||
585 | val = sym->st_value; | |
586 | addend = rel[i].r_addend; | |
587 | ||
588 | #if 0 | |
589 | #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t : | |
590 | DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n", | |
591 | strtab + sym->st_name, | |
592 | (uint32_t)loc, val, addend, | |
593 | r(R_PARISC_PLABEL32) | |
594 | r(R_PARISC_DIR32) | |
595 | r(R_PARISC_DIR21L) | |
596 | r(R_PARISC_DIR14R) | |
597 | r(R_PARISC_SEGREL32) | |
598 | r(R_PARISC_DPREL21L) | |
599 | r(R_PARISC_DPREL14R) | |
600 | r(R_PARISC_PCREL17F) | |
601 | r(R_PARISC_PCREL22F) | |
602 | "UNKNOWN"); | |
603 | #undef r | |
604 | #endif | |
605 | ||
606 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
607 | case R_PARISC_PLABEL32: | |
608 | /* 32-bit function address */ | |
609 | /* no function descriptors... */ | |
610 | *loc = fsel(val, addend); | |
611 | break; | |
612 | case R_PARISC_DIR32: | |
613 | /* direct 32-bit ref */ | |
614 | *loc = fsel(val, addend); | |
615 | break; | |
616 | case R_PARISC_DIR21L: | |
617 | /* left 21 bits of effective address */ | |
618 | val = lrsel(val, addend); | |
619 | *loc = mask(*loc, 21) | reassemble_21(val); | |
620 | break; | |
621 | case R_PARISC_DIR14R: | |
622 | /* right 14 bits of effective address */ | |
623 | val = rrsel(val, addend); | |
624 | *loc = mask(*loc, 14) | reassemble_14(val); | |
625 | break; | |
626 | case R_PARISC_SEGREL32: | |
627 | /* 32-bit segment relative address */ | |
628 | /* See note about special handling of SEGREL32 at | |
629 | * the beginning of this file. | |
630 | */ | |
631 | *loc = fsel(val, addend); | |
632 | break; | |
633 | case R_PARISC_DPREL21L: | |
634 | /* left 21 bit of relative address */ | |
635 | val = lrsel(val - dp, addend); | |
636 | *loc = mask(*loc, 21) | reassemble_21(val); | |
637 | break; | |
638 | case R_PARISC_DPREL14R: | |
639 | /* right 14 bit of relative address */ | |
640 | val = rrsel(val - dp, addend); | |
641 | *loc = mask(*loc, 14) | reassemble_14(val); | |
642 | break; | |
643 | case R_PARISC_PCREL17F: | |
644 | /* 17-bit PC relative address */ | |
c298be74 HD |
645 | /* calculate direct call offset */ |
646 | val += addend; | |
1da177e4 | 647 | val = (val - dot - 8)/4; |
c298be74 HD |
648 | if (!RELOC_REACHABLE(val, 17)) { |
649 | /* direct distance too far, create | |
650 | * stub entry instead */ | |
651 | val = get_stub(me, sym->st_value, addend, | |
652 | ELF_STUB_DIRECT, loc0, targetsec); | |
653 | val = (val - dot - 8)/4; | |
654 | CHECK_RELOC(val, 17); | |
655 | } | |
1da177e4 LT |
656 | *loc = (*loc & ~0x1f1ffd) | reassemble_17(val); |
657 | break; | |
658 | case R_PARISC_PCREL22F: | |
659 | /* 22-bit PC relative address; only defined for pa20 */ | |
c298be74 HD |
660 | /* calculate direct call offset */ |
661 | val += addend; | |
1da177e4 | 662 | val = (val - dot - 8)/4; |
c298be74 HD |
663 | if (!RELOC_REACHABLE(val, 22)) { |
664 | /* direct distance too far, create | |
665 | * stub entry instead */ | |
666 | val = get_stub(me, sym->st_value, addend, | |
667 | ELF_STUB_DIRECT, loc0, targetsec); | |
668 | val = (val - dot - 8)/4; | |
669 | CHECK_RELOC(val, 22); | |
670 | } | |
1da177e4 LT |
671 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
672 | break; | |
673 | ||
674 | default: | |
675 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
676 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
677 | return -ENOEXEC; | |
678 | } | |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | #else | |
685 | int apply_relocate_add(Elf_Shdr *sechdrs, | |
686 | const char *strtab, | |
687 | unsigned int symindex, | |
688 | unsigned int relsec, | |
689 | struct module *me) | |
690 | { | |
691 | int i; | |
692 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
693 | Elf64_Sym *sym; | |
694 | Elf64_Word *loc; | |
695 | Elf64_Xword *loc64; | |
696 | Elf64_Addr val; | |
697 | Elf64_Sxword addend; | |
698 | Elf64_Addr dot; | |
c298be74 HD |
699 | Elf_Addr loc0; |
700 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 LT |
701 | |
702 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
c298be74 | 703 | targetsec); |
1da177e4 LT |
704 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
705 | /* This is where to make the change */ | |
c298be74 | 706 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 707 | + rel[i].r_offset; |
c298be74 HD |
708 | /* This is the start of the target section */ |
709 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
710 | /* This is the symbol it is referring to */ |
711 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
712 | + ELF64_R_SYM(rel[i].r_info); | |
713 | if (!sym->st_value) { | |
714 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
715 | me->name, strtab + sym->st_name); | |
716 | return -ENOENT; | |
717 | } | |
718 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; | |
719 | dot = (Elf64_Addr)loc & ~0x03; | |
720 | loc64 = (Elf64_Xword *)loc; | |
721 | ||
722 | val = sym->st_value; | |
723 | addend = rel[i].r_addend; | |
724 | ||
725 | #if 0 | |
726 | #define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t : | |
727 | printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n", | |
728 | strtab + sym->st_name, | |
729 | loc, val, addend, | |
730 | r(R_PARISC_LTOFF14R) | |
731 | r(R_PARISC_LTOFF21L) | |
732 | r(R_PARISC_PCREL22F) | |
733 | r(R_PARISC_DIR64) | |
734 | r(R_PARISC_SEGREL32) | |
735 | r(R_PARISC_FPTR64) | |
736 | "UNKNOWN"); | |
737 | #undef r | |
738 | #endif | |
739 | ||
740 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
741 | case R_PARISC_LTOFF21L: | |
742 | /* LT-relative; left 21 bits */ | |
743 | val = get_got(me, val, addend); | |
744 | DEBUGP("LTOFF21L Symbol %s loc %p val %lx\n", | |
745 | strtab + sym->st_name, | |
746 | loc, val); | |
747 | val = lrsel(val, 0); | |
748 | *loc = mask(*loc, 21) | reassemble_21(val); | |
749 | break; | |
750 | case R_PARISC_LTOFF14R: | |
751 | /* L(ltoff(val+addend)) */ | |
752 | /* LT-relative; right 14 bits */ | |
753 | val = get_got(me, val, addend); | |
754 | val = rrsel(val, 0); | |
755 | DEBUGP("LTOFF14R Symbol %s loc %p val %lx\n", | |
756 | strtab + sym->st_name, | |
757 | loc, val); | |
758 | *loc = mask(*loc, 14) | reassemble_14(val); | |
759 | break; | |
760 | case R_PARISC_PCREL22F: | |
761 | /* PC-relative; 22 bits */ | |
762 | DEBUGP("PCREL22F Symbol %s loc %p val %lx\n", | |
763 | strtab + sym->st_name, | |
764 | loc, val); | |
c298be74 | 765 | val += addend; |
1da177e4 | 766 | /* can we reach it locally? */ |
c298be74 HD |
767 | if (in_local(me, (void *)val)) { |
768 | /* this is the case where the symbol is local | |
769 | * to the module, but in a different section, | |
770 | * so stub the jump in case it's more than 22 | |
771 | * bits away */ | |
772 | val = (val - dot - 8)/4; | |
773 | if (!RELOC_REACHABLE(val, 22)) { | |
774 | /* direct distance too far, create | |
775 | * stub entry instead */ | |
776 | val = get_stub(me, sym->st_value, | |
777 | addend, ELF_STUB_DIRECT, | |
778 | loc0, targetsec); | |
779 | } else { | |
780 | /* Ok, we can reach it directly. */ | |
781 | val = sym->st_value; | |
782 | val += addend; | |
783 | } | |
784 | } else { | |
785 | val = sym->st_value; | |
786 | if (strncmp(strtab + sym->st_name, "$$", 2) | |
1da177e4 | 787 | == 0) |
6e1b9585 | 788 | val = get_stub(me, val, addend, ELF_STUB_MILLI, |
c298be74 | 789 | loc0, targetsec); |
1da177e4 | 790 | else |
6e1b9585 | 791 | val = get_stub(me, val, addend, ELF_STUB_GOT, |
c298be74 | 792 | loc0, targetsec); |
1da177e4 LT |
793 | } |
794 | DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n", | |
795 | strtab + sym->st_name, loc, sym->st_value, | |
796 | addend, val); | |
1da177e4 | 797 | val = (val - dot - 8)/4; |
c298be74 | 798 | CHECK_RELOC(val, 22); |
1da177e4 LT |
799 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
800 | break; | |
801 | case R_PARISC_DIR64: | |
802 | /* 64-bit effective address */ | |
803 | *loc64 = val + addend; | |
804 | break; | |
805 | case R_PARISC_SEGREL32: | |
806 | /* 32-bit segment relative address */ | |
807 | /* See note about special handling of SEGREL32 at | |
808 | * the beginning of this file. | |
809 | */ | |
810 | *loc = fsel(val, addend); | |
811 | break; | |
812 | case R_PARISC_FPTR64: | |
813 | /* 64-bit function address */ | |
959ed340 | 814 | if(in_local(me, (void *)(val + addend))) { |
1da177e4 LT |
815 | *loc64 = get_fdesc(me, val+addend); |
816 | DEBUGP("FDESC for %s at %p points to %lx\n", | |
817 | strtab + sym->st_name, *loc64, | |
818 | ((Elf_Fdesc *)*loc64)->addr); | |
819 | } else { | |
820 | /* if the symbol is not local to this | |
821 | * module then val+addend is a pointer | |
822 | * to the function descriptor */ | |
823 | DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n", | |
824 | strtab + sym->st_name, | |
825 | loc, val); | |
826 | *loc64 = val + addend; | |
827 | } | |
828 | break; | |
829 | ||
830 | default: | |
831 | printk(KERN_ERR "module %s: Unknown relocation: %Lu\n", | |
832 | me->name, ELF64_R_TYPE(rel[i].r_info)); | |
833 | return -ENOEXEC; | |
834 | } | |
835 | } | |
836 | return 0; | |
837 | } | |
838 | #endif | |
839 | ||
840 | static void | |
841 | register_unwind_table(struct module *me, | |
842 | const Elf_Shdr *sechdrs) | |
843 | { | |
844 | unsigned char *table, *end; | |
845 | unsigned long gp; | |
846 | ||
847 | if (!me->arch.unwind_section) | |
848 | return; | |
849 | ||
850 | table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr; | |
851 | end = table + sechdrs[me->arch.unwind_section].sh_size; | |
852 | gp = (Elf_Addr)me->module_core + me->arch.got_offset; | |
853 | ||
854 | DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n", | |
855 | me->arch.unwind_section, table, end, gp); | |
856 | me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end); | |
857 | } | |
858 | ||
859 | static void | |
860 | deregister_unwind_table(struct module *me) | |
861 | { | |
862 | if (me->arch.unwind) | |
863 | unwind_table_remove(me->arch.unwind); | |
864 | } | |
865 | ||
866 | int module_finalize(const Elf_Ehdr *hdr, | |
867 | const Elf_Shdr *sechdrs, | |
868 | struct module *me) | |
869 | { | |
870 | int i; | |
871 | unsigned long nsyms; | |
872 | const char *strtab = NULL; | |
873 | Elf_Sym *newptr, *oldptr; | |
874 | Elf_Shdr *symhdr = NULL; | |
875 | #ifdef DEBUG | |
876 | Elf_Fdesc *entry; | |
877 | u32 *addr; | |
878 | ||
879 | entry = (Elf_Fdesc *)me->init; | |
880 | printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry, | |
881 | entry->gp, entry->addr); | |
882 | addr = (u32 *)entry->addr; | |
883 | printk("INSNS: %x %x %x %x\n", | |
884 | addr[0], addr[1], addr[2], addr[3]); | |
c298be74 | 885 | printk("got entries used %ld, gots max %ld\n" |
1da177e4 | 886 | "fdescs used %ld, fdescs max %ld\n", |
1da177e4 LT |
887 | me->arch.got_count, me->arch.got_max, |
888 | me->arch.fdesc_count, me->arch.fdesc_max); | |
889 | #endif | |
890 | ||
891 | register_unwind_table(me, sechdrs); | |
892 | ||
893 | /* haven't filled in me->symtab yet, so have to find it | |
894 | * ourselves */ | |
895 | for (i = 1; i < hdr->e_shnum; i++) { | |
896 | if(sechdrs[i].sh_type == SHT_SYMTAB | |
fe579c69 | 897 | && (sechdrs[i].sh_flags & SHF_ALLOC)) { |
1da177e4 LT |
898 | int strindex = sechdrs[i].sh_link; |
899 | /* FIXME: AWFUL HACK | |
900 | * The cast is to drop the const from | |
901 | * the sechdrs pointer */ | |
902 | symhdr = (Elf_Shdr *)&sechdrs[i]; | |
903 | strtab = (char *)sechdrs[strindex].sh_addr; | |
904 | break; | |
905 | } | |
906 | } | |
907 | ||
908 | DEBUGP("module %s: strtab %p, symhdr %p\n", | |
909 | me->name, strtab, symhdr); | |
910 | ||
911 | if(me->arch.got_count > MAX_GOTS) { | |
f8fc18a1 HD |
912 | printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n", |
913 | me->name, me->arch.got_count, MAX_GOTS); | |
1da177e4 LT |
914 | return -EINVAL; |
915 | } | |
c298be74 HD |
916 | |
917 | kfree(me->arch.section); | |
918 | me->arch.section = NULL; | |
919 | ||
1da177e4 LT |
920 | /* no symbol table */ |
921 | if(symhdr == NULL) | |
922 | return 0; | |
923 | ||
924 | oldptr = (void *)symhdr->sh_addr; | |
925 | newptr = oldptr + 1; /* we start counting at 1 */ | |
926 | nsyms = symhdr->sh_size / sizeof(Elf_Sym); | |
927 | DEBUGP("OLD num_symtab %lu\n", nsyms); | |
928 | ||
929 | for (i = 1; i < nsyms; i++) { | |
930 | oldptr++; /* note, count starts at 1 so preincrement */ | |
931 | if(strncmp(strtab + oldptr->st_name, | |
932 | ".L", 2) == 0) | |
933 | continue; | |
934 | ||
935 | if(newptr != oldptr) | |
936 | *newptr++ = *oldptr; | |
937 | else | |
938 | newptr++; | |
939 | ||
940 | } | |
941 | nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; | |
942 | DEBUGP("NEW num_symtab %lu\n", nsyms); | |
943 | symhdr->sh_size = nsyms * sizeof(Elf_Sym); | |
5336377d | 944 | return 0; |
1da177e4 LT |
945 | } |
946 | ||
947 | void module_arch_cleanup(struct module *mod) | |
948 | { | |
949 | deregister_unwind_table(mod); | |
950 | } |