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