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)) |
7523e4dc | 45 | * val -= (uint32_t)me->init_layout.base; |
1da177e4 | 46 | * else |
7523e4dc | 47 | * val -= (uint32_t)me->core_layout.base; |
1da177e4 LT |
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> |
d7dd2ff1 | 64 | #include <linux/mm.h> |
5a0e3ad6 | 65 | #include <linux/slab.h> |
1da177e4 | 66 | |
d7dd2ff1 | 67 | #include <asm/pgtable.h> |
1da177e4 LT |
68 | #include <asm/unwind.h> |
69 | ||
70 | #if 0 | |
71 | #define DEBUGP printk | |
72 | #else | |
73 | #define DEBUGP(fmt...) | |
74 | #endif | |
75 | ||
c298be74 HD |
76 | #define RELOC_REACHABLE(val, bits) \ |
77 | (( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \ | |
78 | ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \ | |
79 | 0 : 1) | |
80 | ||
1da177e4 | 81 | #define CHECK_RELOC(val, bits) \ |
c298be74 | 82 | if (!RELOC_REACHABLE(val, bits)) { \ |
1da177e4 LT |
83 | printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \ |
84 | me->name, strtab + sym->st_name, (unsigned long)val, bits); \ | |
85 | return -ENOEXEC; \ | |
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 | |
b4f2e2ad JDA |
92 | * at most 1023 entries. |
93 | * To overcome this 14bit displacement with some kernel modules, we'll | |
94 | * use instead the unusal 16bit displacement method (see reassemble_16a) | |
95 | * which gives us a maximum positive displacement of 0x7fff, and as such | |
96 | * allows us to allocate up to 4095 GOT entries. */ | |
97 | #define MAX_GOTS 4095 | |
1da177e4 LT |
98 | |
99 | /* three functions to determine where in the module core | |
100 | * or init pieces the location is */ | |
959ed340 | 101 | static inline int in_init(struct module *me, void *loc) |
1da177e4 | 102 | { |
7523e4dc RR |
103 | return (loc >= me->init_layout.base && |
104 | loc <= (me->init_layout.base + me->init_layout.size)); | |
1da177e4 LT |
105 | } |
106 | ||
959ed340 | 107 | static inline int in_core(struct module *me, void *loc) |
1da177e4 | 108 | { |
7523e4dc RR |
109 | return (loc >= me->core_layout.base && |
110 | loc <= (me->core_layout.base + me->core_layout.size)); | |
1da177e4 LT |
111 | } |
112 | ||
959ed340 | 113 | static inline int in_local(struct module *me, void *loc) |
1da177e4 | 114 | { |
959ed340 | 115 | return in_init(me, loc) || in_core(me, loc); |
1da177e4 LT |
116 | } |
117 | ||
a8f44e38 | 118 | #ifndef CONFIG_64BIT |
1da177e4 LT |
119 | struct got_entry { |
120 | Elf32_Addr addr; | |
121 | }; | |
122 | ||
1da177e4 LT |
123 | struct stub_entry { |
124 | Elf32_Word insns[2]; /* each stub entry has two insns */ | |
125 | }; | |
126 | #else | |
127 | struct got_entry { | |
128 | Elf64_Addr addr; | |
129 | }; | |
130 | ||
1da177e4 LT |
131 | struct 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. */ | |
b4f2e2ad JDA |
155 | static 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 | ||
163 | static 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 | ||
1da177e4 LT |
172 | static inline int reassemble_14(int as14) |
173 | { | |
174 | return (((as14 & 0x1fff) << 1) | | |
175 | ((as14 & 0x2000) >> 13)); | |
176 | } | |
177 | ||
b4f2e2ad JDA |
178 | static 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 | ||
1da177e4 LT |
189 | static 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 | ||
197 | static 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 | ||
206 | static 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 | ||
215 | void *module_alloc(unsigned long size) | |
216 | { | |
d7dd2ff1 JB |
217 | /* 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, | |
cb9e3c29 | 222 | PAGE_KERNEL_RWX, 0, NUMA_NO_NODE, |
d7dd2ff1 | 223 | __builtin_return_address(0)); |
1da177e4 LT |
224 | } |
225 | ||
a8f44e38 | 226 | #ifndef CONFIG_64BIT |
1da177e4 LT |
227 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) |
228 | { | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) | |
233 | { | |
234 | return 0; | |
235 | } | |
236 | ||
237 | static 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 | |
253 | static 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 | ||
270 | static 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 | ||
285 | static 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 | ||
d453cded | 301 | void module_arch_freeing_init(struct module *mod) |
1da177e4 | 302 | { |
c298be74 HD |
303 | kfree(mod->arch.section); |
304 | mod->arch.section = NULL; | |
1da177e4 LT |
305 | } |
306 | ||
c298be74 HD |
307 | /* Additional bytes needed in front of individual sections */ |
308 | unsigned int arch_mod_section_prepend(struct module *mod, | |
309 | unsigned int section) | |
310 | { | |
311 | /* size needed for all stubs of this section (including | |
312 | * one additional for correct alignment of the stubs) */ | |
313 | return (mod->arch.section[section].stub_entries + 1) | |
314 | * sizeof(struct stub_entry); | |
315 | } | |
316 | ||
1da177e4 LT |
317 | #define CONST |
318 | int module_frob_arch_sections(CONST Elf_Ehdr *hdr, | |
319 | CONST Elf_Shdr *sechdrs, | |
320 | CONST char *secstrings, | |
321 | struct module *me) | |
322 | { | |
c298be74 | 323 | unsigned long gots = 0, fdescs = 0, len; |
1da177e4 LT |
324 | unsigned int i; |
325 | ||
c298be74 HD |
326 | len = hdr->e_shnum * sizeof(me->arch.section[0]); |
327 | me->arch.section = kzalloc(len, GFP_KERNEL); | |
328 | if (!me->arch.section) | |
329 | return -ENOMEM; | |
330 | ||
1da177e4 | 331 | for (i = 1; i < hdr->e_shnum; i++) { |
c298be74 | 332 | const Elf_Rela *rels = (void *)sechdrs[i].sh_addr; |
1da177e4 | 333 | unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels); |
c298be74 | 334 | unsigned int count, s; |
1da177e4 LT |
335 | |
336 | if (strncmp(secstrings + sechdrs[i].sh_name, | |
337 | ".PARISC.unwind", 14) == 0) | |
338 | me->arch.unwind_section = i; | |
339 | ||
340 | if (sechdrs[i].sh_type != SHT_RELA) | |
341 | continue; | |
342 | ||
343 | /* some of these are not relevant for 32-bit/64-bit | |
344 | * we leave them here to make the code common. the | |
345 | * compiler will do its thing and optimize out the | |
346 | * stuff we don't need | |
347 | */ | |
348 | gots += count_gots(rels, nrels); | |
349 | fdescs += count_fdescs(rels, nrels); | |
c298be74 HD |
350 | |
351 | /* XXX: By sorting the relocs and finding duplicate entries | |
352 | * we could reduce the number of necessary stubs and save | |
353 | * some memory. */ | |
354 | count = count_stubs(rels, nrels); | |
355 | if (!count) | |
356 | continue; | |
357 | ||
358 | /* so we need relocation stubs. reserve necessary memory. */ | |
359 | /* sh_info gives the section for which we need to add stubs. */ | |
360 | s = sechdrs[i].sh_info; | |
361 | ||
362 | /* each code section should only have one relocation section */ | |
363 | WARN_ON(me->arch.section[s].stub_entries); | |
364 | ||
365 | /* store number of stubs we need for this section */ | |
366 | me->arch.section[s].stub_entries += count; | |
1da177e4 LT |
367 | } |
368 | ||
369 | /* align things a bit */ | |
7523e4dc RR |
370 | me->core_layout.size = ALIGN(me->core_layout.size, 16); |
371 | me->arch.got_offset = me->core_layout.size; | |
372 | me->core_layout.size += gots * sizeof(struct got_entry); | |
1da177e4 | 373 | |
7523e4dc RR |
374 | me->core_layout.size = ALIGN(me->core_layout.size, 16); |
375 | me->arch.fdesc_offset = me->core_layout.size; | |
376 | me->core_layout.size += fdescs * sizeof(Elf_Fdesc); | |
1da177e4 | 377 | |
1da177e4 LT |
378 | me->arch.got_max = gots; |
379 | me->arch.fdesc_max = fdescs; | |
1da177e4 LT |
380 | |
381 | return 0; | |
382 | } | |
383 | ||
a8f44e38 | 384 | #ifdef CONFIG_64BIT |
1da177e4 LT |
385 | static Elf64_Word get_got(struct module *me, unsigned long value, long addend) |
386 | { | |
387 | unsigned int i; | |
388 | struct got_entry *got; | |
389 | ||
390 | value += addend; | |
391 | ||
392 | BUG_ON(value == 0); | |
393 | ||
7523e4dc | 394 | got = me->core_layout.base + me->arch.got_offset; |
1da177e4 LT |
395 | for (i = 0; got[i].addr; i++) |
396 | if (got[i].addr == value) | |
397 | goto out; | |
398 | ||
399 | BUG_ON(++me->arch.got_count > me->arch.got_max); | |
400 | ||
401 | got[i].addr = value; | |
402 | out: | |
403 | DEBUGP("GOT ENTRY %d[%x] val %lx\n", i, i*sizeof(struct got_entry), | |
404 | value); | |
405 | return i * sizeof(struct got_entry); | |
406 | } | |
a8f44e38 | 407 | #endif /* CONFIG_64BIT */ |
1da177e4 | 408 | |
a8f44e38 | 409 | #ifdef CONFIG_64BIT |
1da177e4 LT |
410 | static Elf_Addr get_fdesc(struct module *me, unsigned long value) |
411 | { | |
7523e4dc | 412 | Elf_Fdesc *fdesc = me->core_layout.base + me->arch.fdesc_offset; |
1da177e4 LT |
413 | |
414 | if (!value) { | |
415 | printk(KERN_ERR "%s: zero OPD requested!\n", me->name); | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /* Look for existing fdesc entry. */ | |
420 | while (fdesc->addr) { | |
421 | if (fdesc->addr == value) | |
422 | return (Elf_Addr)fdesc; | |
423 | fdesc++; | |
424 | } | |
425 | ||
426 | BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max); | |
427 | ||
428 | /* Create new one */ | |
429 | fdesc->addr = value; | |
7523e4dc | 430 | fdesc->gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset; |
1da177e4 LT |
431 | return (Elf_Addr)fdesc; |
432 | } | |
a8f44e38 | 433 | #endif /* CONFIG_64BIT */ |
1da177e4 | 434 | |
6e1b9585 JB |
435 | enum elf_stub_type { |
436 | ELF_STUB_GOT, | |
437 | ELF_STUB_MILLI, | |
438 | ELF_STUB_DIRECT, | |
439 | }; | |
440 | ||
1da177e4 | 441 | static Elf_Addr get_stub(struct module *me, unsigned long value, long addend, |
c298be74 | 442 | enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec) |
1da177e4 | 443 | { |
1da177e4 | 444 | struct stub_entry *stub; |
b4f2e2ad | 445 | int __maybe_unused d; |
1da177e4 | 446 | |
c298be74 HD |
447 | /* initialize stub_offset to point in front of the section */ |
448 | if (!me->arch.section[targetsec].stub_offset) { | |
449 | loc0 -= (me->arch.section[targetsec].stub_entries + 1) * | |
450 | sizeof(struct stub_entry); | |
451 | /* get correct alignment for the stubs */ | |
452 | loc0 = ALIGN(loc0, sizeof(struct stub_entry)); | |
453 | me->arch.section[targetsec].stub_offset = loc0; | |
1da177e4 LT |
454 | } |
455 | ||
c298be74 HD |
456 | /* get address of stub entry */ |
457 | stub = (void *) me->arch.section[targetsec].stub_offset; | |
458 | me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry); | |
459 | ||
460 | /* do not write outside available stub area */ | |
461 | BUG_ON(0 == me->arch.section[targetsec].stub_entries--); | |
462 | ||
463 | ||
a8f44e38 | 464 | #ifndef CONFIG_64BIT |
1da177e4 LT |
465 | /* for 32-bit the stub looks like this: |
466 | * ldil L'XXX,%r1 | |
467 | * be,n R'XXX(%sr4,%r1) | |
468 | */ | |
469 | //value = *(unsigned long *)((value + addend) & ~3); /* why? */ | |
470 | ||
471 | stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */ | |
472 | stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */ | |
473 | ||
474 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
475 | stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4); | |
476 | ||
477 | #else | |
6e1b9585 | 478 | /* for 64-bit we have three kinds of stubs: |
1da177e4 LT |
479 | * for normal function calls: |
480 | * ldd 0(%dp),%dp | |
481 | * ldd 10(%dp), %r1 | |
482 | * bve (%r1) | |
483 | * ldd 18(%dp), %dp | |
484 | * | |
485 | * for millicode: | |
486 | * ldil 0, %r1 | |
487 | * ldo 0(%r1), %r1 | |
488 | * ldd 10(%r1), %r1 | |
489 | * bve,n (%r1) | |
6e1b9585 JB |
490 | * |
491 | * for direct branches (jumps between different section of the | |
492 | * same module): | |
493 | * ldil 0, %r1 | |
494 | * ldo 0(%r1), %r1 | |
495 | * bve,n (%r1) | |
1da177e4 | 496 | */ |
6e1b9585 JB |
497 | switch (stub_type) { |
498 | case ELF_STUB_GOT: | |
b4f2e2ad JDA |
499 | d = get_got(me, value, addend); |
500 | if (d <= 15) { | |
501 | /* Format 5 */ | |
502 | stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */ | |
503 | stub->insns[0] |= low_sign_unext(d, 5) << 16; | |
504 | } else { | |
505 | /* Format 3 */ | |
506 | stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */ | |
507 | stub->insns[0] |= reassemble_16a(d); | |
508 | } | |
1da177e4 LT |
509 | stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */ |
510 | stub->insns[2] = 0xe820d000; /* bve (%r1) */ | |
511 | stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */ | |
6e1b9585 JB |
512 | break; |
513 | case ELF_STUB_MILLI: | |
1da177e4 LT |
514 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ |
515 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
516 | stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */ | |
517 | stub->insns[3] = 0xe820d002; /* bve,n (%r1) */ | |
518 | ||
519 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
520 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
6e1b9585 JB |
521 | break; |
522 | case ELF_STUB_DIRECT: | |
523 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ | |
524 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
525 | stub->insns[2] = 0xe820d002; /* bve,n (%r1) */ | |
526 | ||
527 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
528 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
529 | break; | |
1da177e4 | 530 | } |
6e1b9585 | 531 | |
1da177e4 LT |
532 | #endif |
533 | ||
534 | return (Elf_Addr)stub; | |
535 | } | |
536 | ||
a8f44e38 | 537 | #ifndef CONFIG_64BIT |
1da177e4 LT |
538 | int apply_relocate_add(Elf_Shdr *sechdrs, |
539 | const char *strtab, | |
540 | unsigned int symindex, | |
541 | unsigned int relsec, | |
542 | struct module *me) | |
543 | { | |
544 | int i; | |
545 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
546 | Elf32_Sym *sym; | |
547 | Elf32_Word *loc; | |
548 | Elf32_Addr val; | |
549 | Elf32_Sword addend; | |
550 | Elf32_Addr dot; | |
c298be74 HD |
551 | Elf_Addr loc0; |
552 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 LT |
553 | //unsigned long dp = (unsigned long)$global$; |
554 | register unsigned long dp asm ("r27"); | |
555 | ||
556 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
c298be74 | 557 | targetsec); |
1da177e4 LT |
558 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
559 | /* This is where to make the change */ | |
c298be74 | 560 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 561 | + rel[i].r_offset; |
c298be74 HD |
562 | /* This is the start of the target section */ |
563 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
564 | /* This is the symbol it is referring to */ |
565 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
566 | + ELF32_R_SYM(rel[i].r_info); | |
567 | if (!sym->st_value) { | |
568 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
569 | me->name, strtab + sym->st_name); | |
570 | return -ENOENT; | |
571 | } | |
572 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; | |
573 | dot = (Elf32_Addr)loc & ~0x03; | |
574 | ||
575 | val = sym->st_value; | |
576 | addend = rel[i].r_addend; | |
577 | ||
578 | #if 0 | |
579 | #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t : | |
580 | DEBUGP("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n", | |
581 | strtab + sym->st_name, | |
582 | (uint32_t)loc, val, addend, | |
583 | r(R_PARISC_PLABEL32) | |
584 | r(R_PARISC_DIR32) | |
585 | r(R_PARISC_DIR21L) | |
586 | r(R_PARISC_DIR14R) | |
587 | r(R_PARISC_SEGREL32) | |
588 | r(R_PARISC_DPREL21L) | |
589 | r(R_PARISC_DPREL14R) | |
590 | r(R_PARISC_PCREL17F) | |
591 | r(R_PARISC_PCREL22F) | |
592 | "UNKNOWN"); | |
593 | #undef r | |
594 | #endif | |
595 | ||
596 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
597 | case R_PARISC_PLABEL32: | |
598 | /* 32-bit function address */ | |
599 | /* no function descriptors... */ | |
600 | *loc = fsel(val, addend); | |
601 | break; | |
602 | case R_PARISC_DIR32: | |
603 | /* direct 32-bit ref */ | |
604 | *loc = fsel(val, addend); | |
605 | break; | |
606 | case R_PARISC_DIR21L: | |
607 | /* left 21 bits of effective address */ | |
608 | val = lrsel(val, addend); | |
609 | *loc = mask(*loc, 21) | reassemble_21(val); | |
610 | break; | |
611 | case R_PARISC_DIR14R: | |
612 | /* right 14 bits of effective address */ | |
613 | val = rrsel(val, addend); | |
614 | *loc = mask(*loc, 14) | reassemble_14(val); | |
615 | break; | |
616 | case R_PARISC_SEGREL32: | |
617 | /* 32-bit segment relative address */ | |
618 | /* See note about special handling of SEGREL32 at | |
619 | * the beginning of this file. | |
620 | */ | |
621 | *loc = fsel(val, addend); | |
622 | break; | |
623 | case R_PARISC_DPREL21L: | |
624 | /* left 21 bit of relative address */ | |
625 | val = lrsel(val - dp, addend); | |
626 | *loc = mask(*loc, 21) | reassemble_21(val); | |
627 | break; | |
628 | case R_PARISC_DPREL14R: | |
629 | /* right 14 bit of relative address */ | |
630 | val = rrsel(val - dp, addend); | |
631 | *loc = mask(*loc, 14) | reassemble_14(val); | |
632 | break; | |
633 | case R_PARISC_PCREL17F: | |
634 | /* 17-bit PC relative address */ | |
c298be74 HD |
635 | /* calculate direct call offset */ |
636 | val += addend; | |
1da177e4 | 637 | val = (val - dot - 8)/4; |
c298be74 HD |
638 | if (!RELOC_REACHABLE(val, 17)) { |
639 | /* direct distance too far, create | |
640 | * stub entry instead */ | |
641 | val = get_stub(me, sym->st_value, addend, | |
642 | ELF_STUB_DIRECT, loc0, targetsec); | |
643 | val = (val - dot - 8)/4; | |
644 | CHECK_RELOC(val, 17); | |
645 | } | |
1da177e4 LT |
646 | *loc = (*loc & ~0x1f1ffd) | reassemble_17(val); |
647 | break; | |
648 | case R_PARISC_PCREL22F: | |
649 | /* 22-bit PC relative address; only defined for pa20 */ | |
c298be74 HD |
650 | /* calculate direct call offset */ |
651 | val += addend; | |
1da177e4 | 652 | val = (val - dot - 8)/4; |
c298be74 HD |
653 | if (!RELOC_REACHABLE(val, 22)) { |
654 | /* direct distance too far, create | |
655 | * stub entry instead */ | |
656 | val = get_stub(me, sym->st_value, addend, | |
657 | ELF_STUB_DIRECT, loc0, targetsec); | |
658 | val = (val - dot - 8)/4; | |
659 | CHECK_RELOC(val, 22); | |
660 | } | |
1da177e4 LT |
661 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
662 | break; | |
592570c9 HD |
663 | case R_PARISC_PCREL32: |
664 | /* 32-bit PC relative address */ | |
665 | *loc = val - dot - 8 + addend; | |
666 | break; | |
1da177e4 LT |
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 | |
679 | int 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; | |
c298be74 HD |
693 | Elf_Addr loc0; |
694 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 LT |
695 | |
696 | DEBUGP("Applying relocate section %u to %u\n", relsec, | |
c298be74 | 697 | targetsec); |
1da177e4 LT |
698 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
699 | /* This is where to make the change */ | |
c298be74 | 700 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 701 | + rel[i].r_offset; |
c298be74 HD |
702 | /* This is the start of the target section */ |
703 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
704 | /* 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); | |
c298be74 | 759 | val += addend; |
1da177e4 | 760 | /* can we reach it locally? */ |
c298be74 HD |
761 | 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) | |
1da177e4 | 781 | == 0) |
6e1b9585 | 782 | val = get_stub(me, val, addend, ELF_STUB_MILLI, |
c298be74 | 783 | loc0, targetsec); |
1da177e4 | 784 | else |
6e1b9585 | 785 | val = get_stub(me, val, addend, ELF_STUB_GOT, |
c298be74 | 786 | loc0, targetsec); |
1da177e4 LT |
787 | } |
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); | |
1da177e4 | 791 | val = (val - dot - 8)/4; |
c298be74 | 792 | CHECK_RELOC(val, 22); |
1da177e4 LT |
793 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
794 | break; | |
592570c9 HD |
795 | case R_PARISC_PCREL32: |
796 | /* 32-bit PC relative address */ | |
797 | *loc = val - dot - 8 + addend; | |
798 | break; | |
1da177e4 LT |
799 | case R_PARISC_DIR64: |
800 | /* 64-bit effective address */ | |
801 | *loc64 = val + addend; | |
802 | break; | |
803 | case R_PARISC_SEGREL32: | |
804 | /* 32-bit segment relative address */ | |
805 | /* See note about special handling of SEGREL32 at | |
806 | * the beginning of this file. | |
807 | */ | |
808 | *loc = fsel(val, addend); | |
809 | break; | |
810 | case R_PARISC_FPTR64: | |
811 | /* 64-bit function address */ | |
959ed340 | 812 | if(in_local(me, (void *)(val + addend))) { |
1da177e4 LT |
813 | *loc64 = get_fdesc(me, val+addend); |
814 | DEBUGP("FDESC for %s at %p points to %lx\n", | |
815 | strtab + sym->st_name, *loc64, | |
816 | ((Elf_Fdesc *)*loc64)->addr); | |
817 | } else { | |
818 | /* if the symbol is not local to this | |
819 | * module then val+addend is a pointer | |
820 | * to the function descriptor */ | |
821 | DEBUGP("Non local FPTR64 Symbol %s loc %p val %lx\n", | |
822 | strtab + sym->st_name, | |
823 | loc, val); | |
824 | *loc64 = val + addend; | |
825 | } | |
826 | break; | |
827 | ||
828 | default: | |
829 | printk(KERN_ERR "module %s: Unknown relocation: %Lu\n", | |
830 | me->name, ELF64_R_TYPE(rel[i].r_info)); | |
831 | return -ENOEXEC; | |
832 | } | |
833 | } | |
834 | return 0; | |
835 | } | |
836 | #endif | |
837 | ||
838 | static void | |
839 | register_unwind_table(struct module *me, | |
840 | const Elf_Shdr *sechdrs) | |
841 | { | |
842 | unsigned char *table, *end; | |
843 | unsigned long gp; | |
844 | ||
845 | if (!me->arch.unwind_section) | |
846 | return; | |
847 | ||
848 | table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr; | |
849 | end = table + sechdrs[me->arch.unwind_section].sh_size; | |
7523e4dc | 850 | gp = (Elf_Addr)me->core_layout.base + me->arch.got_offset; |
1da177e4 LT |
851 | |
852 | DEBUGP("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n", | |
853 | me->arch.unwind_section, table, end, gp); | |
854 | me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end); | |
855 | } | |
856 | ||
857 | static void | |
858 | deregister_unwind_table(struct module *me) | |
859 | { | |
860 | if (me->arch.unwind) | |
861 | unwind_table_remove(me->arch.unwind); | |
862 | } | |
863 | ||
864 | int module_finalize(const Elf_Ehdr *hdr, | |
865 | const Elf_Shdr *sechdrs, | |
866 | struct module *me) | |
867 | { | |
868 | int i; | |
869 | unsigned long nsyms; | |
870 | const char *strtab = NULL; | |
871 | Elf_Sym *newptr, *oldptr; | |
872 | Elf_Shdr *symhdr = NULL; | |
873 | #ifdef DEBUG | |
874 | Elf_Fdesc *entry; | |
875 | u32 *addr; | |
876 | ||
877 | entry = (Elf_Fdesc *)me->init; | |
878 | printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry, | |
879 | entry->gp, entry->addr); | |
880 | addr = (u32 *)entry->addr; | |
881 | printk("INSNS: %x %x %x %x\n", | |
882 | addr[0], addr[1], addr[2], addr[3]); | |
c298be74 | 883 | printk("got entries used %ld, gots max %ld\n" |
1da177e4 | 884 | "fdescs used %ld, fdescs max %ld\n", |
1da177e4 LT |
885 | me->arch.got_count, me->arch.got_max, |
886 | me->arch.fdesc_count, me->arch.fdesc_max); | |
887 | #endif | |
888 | ||
889 | register_unwind_table(me, sechdrs); | |
890 | ||
891 | /* haven't filled in me->symtab yet, so have to find it | |
892 | * ourselves */ | |
893 | for (i = 1; i < hdr->e_shnum; i++) { | |
894 | if(sechdrs[i].sh_type == SHT_SYMTAB | |
fe579c69 | 895 | && (sechdrs[i].sh_flags & SHF_ALLOC)) { |
1da177e4 LT |
896 | int strindex = sechdrs[i].sh_link; |
897 | /* FIXME: AWFUL HACK | |
898 | * The cast is to drop the const from | |
899 | * the sechdrs pointer */ | |
900 | symhdr = (Elf_Shdr *)&sechdrs[i]; | |
901 | strtab = (char *)sechdrs[strindex].sh_addr; | |
902 | break; | |
903 | } | |
904 | } | |
905 | ||
906 | DEBUGP("module %s: strtab %p, symhdr %p\n", | |
907 | me->name, strtab, symhdr); | |
908 | ||
909 | if(me->arch.got_count > MAX_GOTS) { | |
f8fc18a1 HD |
910 | printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n", |
911 | me->name, me->arch.got_count, MAX_GOTS); | |
1da177e4 LT |
912 | return -EINVAL; |
913 | } | |
c298be74 HD |
914 | |
915 | kfree(me->arch.section); | |
916 | me->arch.section = NULL; | |
917 | ||
1da177e4 LT |
918 | /* no symbol table */ |
919 | if(symhdr == NULL) | |
920 | return 0; | |
921 | ||
922 | oldptr = (void *)symhdr->sh_addr; | |
923 | newptr = oldptr + 1; /* we start counting at 1 */ | |
924 | nsyms = symhdr->sh_size / sizeof(Elf_Sym); | |
925 | DEBUGP("OLD num_symtab %lu\n", nsyms); | |
926 | ||
927 | for (i = 1; i < nsyms; i++) { | |
928 | oldptr++; /* note, count starts at 1 so preincrement */ | |
929 | if(strncmp(strtab + oldptr->st_name, | |
930 | ".L", 2) == 0) | |
931 | continue; | |
932 | ||
933 | if(newptr != oldptr) | |
934 | *newptr++ = *oldptr; | |
935 | else | |
936 | newptr++; | |
937 | ||
938 | } | |
939 | nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; | |
940 | DEBUGP("NEW num_symtab %lu\n", nsyms); | |
941 | symhdr->sh_size = nsyms * sizeof(Elf_Sym); | |
5336377d | 942 | return 0; |
1da177e4 LT |
943 | } |
944 | ||
945 | void module_arch_cleanup(struct module *mod) | |
946 | { | |
947 | deregister_unwind_table(mod); | |
948 | } |