Commit | Line | Data |
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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* Kernel dynamically loadable module help for PARISC. |
3 | * | |
4 | * The best reference for this stuff is probably the Processor- | |
5 | * Specific ELF Supplement for PA-RISC: | |
486a77c9 | 6 | * https://parisc.wiki.kernel.org/index.php/File:Elf-pa-hp.pdf |
1da177e4 | 7 | * |
486a77c9 | 8 | * Linux/PA-RISC Project |
1da177e4 | 9 | * Copyright (C) 2003 Randolph Chung <tausq at debian . org> |
c298be74 | 10 | * Copyright (C) 2008 Helge Deller <deller@gmx.de> |
1da177e4 | 11 | * |
1da177e4 | 12 | * Notes: |
c298be74 HD |
13 | * - PLT stub handling |
14 | * On 32bit (and sometimes 64bit) and with big kernel modules like xfs or | |
15 | * ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may | |
16 | * fail to reach their PLT stub if we only create one big stub array for | |
17 | * all sections at the beginning of the core or init section. | |
18 | * Instead we now insert individual PLT stub entries directly in front of | |
19 | * of the code sections where the stubs are actually called. | |
20 | * This reduces the distance between the PCREL location and the stub entry | |
21 | * so that the relocations can be fulfilled. | |
22 | * While calculating the final layout of the kernel module in memory, the | |
23 | * kernel module loader calls arch_mod_section_prepend() to request the | |
24 | * to be reserved amount of memory in front of each individual section. | |
25 | * | |
1da177e4 LT |
26 | * - SEGREL32 handling |
27 | * We are not doing SEGREL32 handling correctly. According to the ABI, we | |
28 | * should do a value offset, like this: | |
959ed340 | 29 | * if (in_init(me, (void *)val)) |
ac3b4328 | 30 | * val -= (uint32_t)me->mem[MOD_INIT_TEXT].base; |
1da177e4 | 31 | * else |
ac3b4328 | 32 | * val -= (uint32_t)me->mem[MOD_TEXT].base; |
1da177e4 LT |
33 | * However, SEGREL32 is used only for PARISC unwind entries, and we want |
34 | * those entries to have an absolute address, and not just an offset. | |
35 | * | |
6183d68b | 36 | * The unwind table mechanism has the ability to specify an offset for |
1da177e4 | 37 | * the unwind table; however, because we split off the init functions into |
6183d68b | 38 | * a different piece of memory, it is not possible to do this using a |
1da177e4 LT |
39 | * single offset. Instead, we use the above hack for now. |
40 | */ | |
41 | ||
42 | #include <linux/moduleloader.h> | |
43 | #include <linux/elf.h> | |
1da177e4 | 44 | #include <linux/fs.h> |
a1326b17 | 45 | #include <linux/ftrace.h> |
1da177e4 LT |
46 | #include <linux/string.h> |
47 | #include <linux/kernel.h> | |
6891f8a1 | 48 | #include <linux/bug.h> |
d7dd2ff1 | 49 | #include <linux/mm.h> |
5a0e3ad6 | 50 | #include <linux/slab.h> |
1da177e4 LT |
51 | |
52 | #include <asm/unwind.h> | |
1705bd6a | 53 | #include <asm/sections.h> |
1da177e4 | 54 | |
c298be74 HD |
55 | #define RELOC_REACHABLE(val, bits) \ |
56 | (( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \ | |
57 | ( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \ | |
58 | 0 : 1) | |
59 | ||
1da177e4 | 60 | #define CHECK_RELOC(val, bits) \ |
c298be74 | 61 | if (!RELOC_REACHABLE(val, bits)) { \ |
1da177e4 LT |
62 | printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \ |
63 | me->name, strtab + sym->st_name, (unsigned long)val, bits); \ | |
64 | return -ENOEXEC; \ | |
65 | } | |
66 | ||
67 | /* Maximum number of GOT entries. We use a long displacement ldd from | |
68 | * the bottom of the table, which has a maximum signed displacement of | |
69 | * 0x3fff; however, since we're only going forward, this becomes | |
70 | * 0x1fff, and thus, since each GOT entry is 8 bytes long we can have | |
b4f2e2ad JDA |
71 | * at most 1023 entries. |
72 | * To overcome this 14bit displacement with some kernel modules, we'll | |
73 | * use instead the unusal 16bit displacement method (see reassemble_16a) | |
74 | * which gives us a maximum positive displacement of 0x7fff, and as such | |
75 | * allows us to allocate up to 4095 GOT entries. */ | |
76 | #define MAX_GOTS 4095 | |
1da177e4 | 77 | |
a8f44e38 | 78 | #ifndef CONFIG_64BIT |
1da177e4 LT |
79 | struct got_entry { |
80 | Elf32_Addr addr; | |
81 | }; | |
82 | ||
1da177e4 LT |
83 | struct stub_entry { |
84 | Elf32_Word insns[2]; /* each stub entry has two insns */ | |
85 | }; | |
86 | #else | |
87 | struct got_entry { | |
88 | Elf64_Addr addr; | |
89 | }; | |
90 | ||
1da177e4 LT |
91 | struct stub_entry { |
92 | Elf64_Word insns[4]; /* each stub entry has four insns */ | |
93 | }; | |
94 | #endif | |
95 | ||
96 | /* Field selection types defined by hppa */ | |
97 | #define rnd(x) (((x)+0x1000)&~0x1fff) | |
98 | /* fsel: full 32 bits */ | |
99 | #define fsel(v,a) ((v)+(a)) | |
100 | /* lsel: select left 21 bits */ | |
101 | #define lsel(v,a) (((v)+(a))>>11) | |
102 | /* rsel: select right 11 bits */ | |
103 | #define rsel(v,a) (((v)+(a))&0x7ff) | |
104 | /* lrsel with rounding of addend to nearest 8k */ | |
105 | #define lrsel(v,a) (((v)+rnd(a))>>11) | |
106 | /* rrsel with rounding of addend to nearest 8k */ | |
107 | #define rrsel(v,a) ((((v)+rnd(a))&0x7ff)+((a)-rnd(a))) | |
108 | ||
109 | #define mask(x,sz) ((x) & ~((1<<(sz))-1)) | |
110 | ||
111 | ||
112 | /* The reassemble_* functions prepare an immediate value for | |
113 | insertion into an opcode. pa-risc uses all sorts of weird bitfields | |
114 | in the instruction to hold the value. */ | |
b4f2e2ad JDA |
115 | static inline int sign_unext(int x, int len) |
116 | { | |
117 | int len_ones; | |
118 | ||
119 | len_ones = (1 << len) - 1; | |
120 | return x & len_ones; | |
121 | } | |
122 | ||
123 | static inline int low_sign_unext(int x, int len) | |
124 | { | |
125 | int sign, temp; | |
126 | ||
127 | sign = (x >> (len-1)) & 1; | |
128 | temp = sign_unext(x, len-1); | |
129 | return (temp << 1) | sign; | |
130 | } | |
131 | ||
1da177e4 LT |
132 | static inline int reassemble_14(int as14) |
133 | { | |
134 | return (((as14 & 0x1fff) << 1) | | |
135 | ((as14 & 0x2000) >> 13)); | |
136 | } | |
137 | ||
b4f2e2ad JDA |
138 | static inline int reassemble_16a(int as16) |
139 | { | |
140 | int s, t; | |
141 | ||
142 | /* Unusual 16-bit encoding, for wide mode only. */ | |
143 | t = (as16 << 1) & 0xffff; | |
144 | s = (as16 & 0x8000); | |
145 | return (t ^ s ^ (s >> 1)) | (s >> 15); | |
146 | } | |
147 | ||
148 | ||
1da177e4 LT |
149 | static inline int reassemble_17(int as17) |
150 | { | |
151 | return (((as17 & 0x10000) >> 16) | | |
152 | ((as17 & 0x0f800) << 5) | | |
153 | ((as17 & 0x00400) >> 8) | | |
154 | ((as17 & 0x003ff) << 3)); | |
155 | } | |
156 | ||
157 | static inline int reassemble_21(int as21) | |
158 | { | |
159 | return (((as21 & 0x100000) >> 20) | | |
160 | ((as21 & 0x0ffe00) >> 8) | | |
161 | ((as21 & 0x000180) << 7) | | |
162 | ((as21 & 0x00007c) << 14) | | |
163 | ((as21 & 0x000003) << 12)); | |
164 | } | |
165 | ||
166 | static inline int reassemble_22(int as22) | |
167 | { | |
168 | return (((as22 & 0x200000) >> 21) | | |
169 | ((as22 & 0x1f0000) << 5) | | |
170 | ((as22 & 0x00f800) << 5) | | |
171 | ((as22 & 0x000400) >> 8) | | |
172 | ((as22 & 0x0003ff) << 3)); | |
173 | } | |
174 | ||
a8f44e38 | 175 | #ifndef CONFIG_64BIT |
1da177e4 LT |
176 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) |
177 | { | |
178 | return 0; | |
179 | } | |
180 | ||
181 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) | |
182 | { | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) | |
187 | { | |
188 | unsigned long cnt = 0; | |
189 | ||
190 | for (; n > 0; n--, rela++) | |
191 | { | |
192 | switch (ELF32_R_TYPE(rela->r_info)) { | |
193 | case R_PARISC_PCREL17F: | |
194 | case R_PARISC_PCREL22F: | |
195 | cnt++; | |
196 | } | |
197 | } | |
198 | ||
199 | return cnt; | |
200 | } | |
201 | #else | |
202 | static inline unsigned long count_gots(const Elf_Rela *rela, unsigned long n) | |
203 | { | |
204 | unsigned long cnt = 0; | |
205 | ||
206 | for (; n > 0; n--, rela++) | |
207 | { | |
208 | switch (ELF64_R_TYPE(rela->r_info)) { | |
209 | case R_PARISC_LTOFF21L: | |
210 | case R_PARISC_LTOFF14R: | |
211 | case R_PARISC_PCREL22F: | |
212 | cnt++; | |
213 | } | |
214 | } | |
215 | ||
216 | return cnt; | |
217 | } | |
218 | ||
219 | static inline unsigned long count_fdescs(const Elf_Rela *rela, unsigned long n) | |
220 | { | |
221 | unsigned long cnt = 0; | |
222 | ||
223 | for (; n > 0; n--, rela++) | |
224 | { | |
225 | switch (ELF64_R_TYPE(rela->r_info)) { | |
226 | case R_PARISC_FPTR64: | |
227 | cnt++; | |
228 | } | |
229 | } | |
230 | ||
231 | return cnt; | |
232 | } | |
233 | ||
234 | static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n) | |
235 | { | |
236 | unsigned long cnt = 0; | |
237 | ||
238 | for (; n > 0; n--, rela++) | |
239 | { | |
240 | switch (ELF64_R_TYPE(rela->r_info)) { | |
241 | case R_PARISC_PCREL22F: | |
242 | cnt++; | |
243 | } | |
244 | } | |
245 | ||
246 | return cnt; | |
247 | } | |
248 | #endif | |
249 | ||
d453cded | 250 | void module_arch_freeing_init(struct module *mod) |
1da177e4 | 251 | { |
c298be74 HD |
252 | kfree(mod->arch.section); |
253 | mod->arch.section = NULL; | |
1da177e4 LT |
254 | } |
255 | ||
c298be74 HD |
256 | /* Additional bytes needed in front of individual sections */ |
257 | unsigned int arch_mod_section_prepend(struct module *mod, | |
258 | unsigned int section) | |
259 | { | |
260 | /* size needed for all stubs of this section (including | |
261 | * one additional for correct alignment of the stubs) */ | |
262 | return (mod->arch.section[section].stub_entries + 1) | |
263 | * sizeof(struct stub_entry); | |
264 | } | |
265 | ||
6183d68b | 266 | #define CONST |
1da177e4 LT |
267 | int module_frob_arch_sections(CONST Elf_Ehdr *hdr, |
268 | CONST Elf_Shdr *sechdrs, | |
269 | CONST char *secstrings, | |
270 | struct module *me) | |
271 | { | |
c298be74 | 272 | unsigned long gots = 0, fdescs = 0, len; |
1da177e4 | 273 | unsigned int i; |
ac3b4328 | 274 | struct module_memory *mod_mem; |
1da177e4 | 275 | |
c298be74 HD |
276 | len = hdr->e_shnum * sizeof(me->arch.section[0]); |
277 | me->arch.section = kzalloc(len, GFP_KERNEL); | |
278 | if (!me->arch.section) | |
279 | return -ENOMEM; | |
280 | ||
1da177e4 | 281 | for (i = 1; i < hdr->e_shnum; i++) { |
c298be74 | 282 | const Elf_Rela *rels = (void *)sechdrs[i].sh_addr; |
1da177e4 | 283 | unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels); |
c298be74 | 284 | unsigned int count, s; |
1da177e4 LT |
285 | |
286 | if (strncmp(secstrings + sechdrs[i].sh_name, | |
287 | ".PARISC.unwind", 14) == 0) | |
288 | me->arch.unwind_section = i; | |
289 | ||
290 | if (sechdrs[i].sh_type != SHT_RELA) | |
291 | continue; | |
292 | ||
293 | /* some of these are not relevant for 32-bit/64-bit | |
294 | * we leave them here to make the code common. the | |
295 | * compiler will do its thing and optimize out the | |
296 | * stuff we don't need | |
297 | */ | |
298 | gots += count_gots(rels, nrels); | |
299 | fdescs += count_fdescs(rels, nrels); | |
c298be74 HD |
300 | |
301 | /* XXX: By sorting the relocs and finding duplicate entries | |
302 | * we could reduce the number of necessary stubs and save | |
303 | * some memory. */ | |
304 | count = count_stubs(rels, nrels); | |
305 | if (!count) | |
306 | continue; | |
307 | ||
308 | /* so we need relocation stubs. reserve necessary memory. */ | |
309 | /* sh_info gives the section for which we need to add stubs. */ | |
310 | s = sechdrs[i].sh_info; | |
311 | ||
312 | /* each code section should only have one relocation section */ | |
313 | WARN_ON(me->arch.section[s].stub_entries); | |
314 | ||
315 | /* store number of stubs we need for this section */ | |
316 | me->arch.section[s].stub_entries += count; | |
1da177e4 LT |
317 | } |
318 | ||
ac3b4328 | 319 | mod_mem = &me->mem[MOD_TEXT]; |
1da177e4 | 320 | /* align things a bit */ |
ac3b4328 SL |
321 | mod_mem->size = ALIGN(mod_mem->size, 16); |
322 | me->arch.got_offset = mod_mem->size; | |
323 | mod_mem->size += gots * sizeof(struct got_entry); | |
1da177e4 | 324 | |
ac3b4328 SL |
325 | mod_mem->size = ALIGN(mod_mem->size, 16); |
326 | me->arch.fdesc_offset = mod_mem->size; | |
327 | mod_mem->size += fdescs * sizeof(Elf_Fdesc); | |
1da177e4 | 328 | |
1da177e4 LT |
329 | me->arch.got_max = gots; |
330 | me->arch.fdesc_max = fdescs; | |
1da177e4 LT |
331 | |
332 | return 0; | |
333 | } | |
334 | ||
a8f44e38 | 335 | #ifdef CONFIG_64BIT |
1da177e4 LT |
336 | static Elf64_Word get_got(struct module *me, unsigned long value, long addend) |
337 | { | |
338 | unsigned int i; | |
339 | struct got_entry *got; | |
340 | ||
341 | value += addend; | |
342 | ||
343 | BUG_ON(value == 0); | |
344 | ||
ac3b4328 | 345 | got = me->mem[MOD_TEXT].base + me->arch.got_offset; |
1da177e4 LT |
346 | for (i = 0; got[i].addr; i++) |
347 | if (got[i].addr == value) | |
348 | goto out; | |
349 | ||
350 | BUG_ON(++me->arch.got_count > me->arch.got_max); | |
351 | ||
352 | got[i].addr = value; | |
353 | out: | |
6183d68b | 354 | pr_debug("GOT ENTRY %d[%lx] val %lx\n", i, i*sizeof(struct got_entry), |
1da177e4 LT |
355 | value); |
356 | return i * sizeof(struct got_entry); | |
357 | } | |
a8f44e38 | 358 | #endif /* CONFIG_64BIT */ |
1da177e4 | 359 | |
a8f44e38 | 360 | #ifdef CONFIG_64BIT |
1da177e4 LT |
361 | static Elf_Addr get_fdesc(struct module *me, unsigned long value) |
362 | { | |
ac3b4328 | 363 | Elf_Fdesc *fdesc = me->mem[MOD_TEXT].base + me->arch.fdesc_offset; |
1da177e4 LT |
364 | |
365 | if (!value) { | |
366 | printk(KERN_ERR "%s: zero OPD requested!\n", me->name); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | /* Look for existing fdesc entry. */ | |
371 | while (fdesc->addr) { | |
372 | if (fdesc->addr == value) | |
373 | return (Elf_Addr)fdesc; | |
374 | fdesc++; | |
375 | } | |
376 | ||
377 | BUG_ON(++me->arch.fdesc_count > me->arch.fdesc_max); | |
378 | ||
379 | /* Create new one */ | |
380 | fdesc->addr = value; | |
ac3b4328 | 381 | fdesc->gp = (Elf_Addr)me->mem[MOD_TEXT].base + me->arch.got_offset; |
1da177e4 LT |
382 | return (Elf_Addr)fdesc; |
383 | } | |
a8f44e38 | 384 | #endif /* CONFIG_64BIT */ |
1da177e4 | 385 | |
6e1b9585 JB |
386 | enum elf_stub_type { |
387 | ELF_STUB_GOT, | |
388 | ELF_STUB_MILLI, | |
389 | ELF_STUB_DIRECT, | |
390 | }; | |
391 | ||
1da177e4 | 392 | static Elf_Addr get_stub(struct module *me, unsigned long value, long addend, |
c298be74 | 393 | enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec) |
1da177e4 | 394 | { |
1da177e4 | 395 | struct stub_entry *stub; |
b4f2e2ad | 396 | int __maybe_unused d; |
1da177e4 | 397 | |
c298be74 HD |
398 | /* initialize stub_offset to point in front of the section */ |
399 | if (!me->arch.section[targetsec].stub_offset) { | |
400 | loc0 -= (me->arch.section[targetsec].stub_entries + 1) * | |
401 | sizeof(struct stub_entry); | |
402 | /* get correct alignment for the stubs */ | |
403 | loc0 = ALIGN(loc0, sizeof(struct stub_entry)); | |
404 | me->arch.section[targetsec].stub_offset = loc0; | |
1da177e4 LT |
405 | } |
406 | ||
c298be74 HD |
407 | /* get address of stub entry */ |
408 | stub = (void *) me->arch.section[targetsec].stub_offset; | |
409 | me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry); | |
410 | ||
411 | /* do not write outside available stub area */ | |
412 | BUG_ON(0 == me->arch.section[targetsec].stub_entries--); | |
413 | ||
414 | ||
a8f44e38 | 415 | #ifndef CONFIG_64BIT |
1da177e4 LT |
416 | /* for 32-bit the stub looks like this: |
417 | * ldil L'XXX,%r1 | |
418 | * be,n R'XXX(%sr4,%r1) | |
419 | */ | |
420 | //value = *(unsigned long *)((value + addend) & ~3); /* why? */ | |
421 | ||
422 | stub->insns[0] = 0x20200000; /* ldil L'XXX,%r1 */ | |
423 | stub->insns[1] = 0xe0202002; /* be,n R'XXX(%sr4,%r1) */ | |
424 | ||
425 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
426 | stub->insns[1] |= reassemble_17(rrsel(value, addend) / 4); | |
427 | ||
428 | #else | |
6e1b9585 | 429 | /* for 64-bit we have three kinds of stubs: |
1da177e4 LT |
430 | * for normal function calls: |
431 | * ldd 0(%dp),%dp | |
432 | * ldd 10(%dp), %r1 | |
433 | * bve (%r1) | |
434 | * ldd 18(%dp), %dp | |
435 | * | |
436 | * for millicode: | |
437 | * ldil 0, %r1 | |
438 | * ldo 0(%r1), %r1 | |
439 | * ldd 10(%r1), %r1 | |
440 | * bve,n (%r1) | |
6e1b9585 JB |
441 | * |
442 | * for direct branches (jumps between different section of the | |
443 | * same module): | |
444 | * ldil 0, %r1 | |
445 | * ldo 0(%r1), %r1 | |
446 | * bve,n (%r1) | |
1da177e4 | 447 | */ |
6e1b9585 JB |
448 | switch (stub_type) { |
449 | case ELF_STUB_GOT: | |
b4f2e2ad JDA |
450 | d = get_got(me, value, addend); |
451 | if (d <= 15) { | |
452 | /* Format 5 */ | |
453 | stub->insns[0] = 0x0f6010db; /* ldd 0(%dp),%dp */ | |
454 | stub->insns[0] |= low_sign_unext(d, 5) << 16; | |
455 | } else { | |
456 | /* Format 3 */ | |
457 | stub->insns[0] = 0x537b0000; /* ldd 0(%dp),%dp */ | |
458 | stub->insns[0] |= reassemble_16a(d); | |
459 | } | |
1da177e4 LT |
460 | stub->insns[1] = 0x53610020; /* ldd 10(%dp),%r1 */ |
461 | stub->insns[2] = 0xe820d000; /* bve (%r1) */ | |
462 | stub->insns[3] = 0x537b0030; /* ldd 18(%dp),%dp */ | |
6e1b9585 JB |
463 | break; |
464 | case ELF_STUB_MILLI: | |
1da177e4 LT |
465 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ |
466 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
467 | stub->insns[2] = 0x50210020; /* ldd 10(%r1),%r1 */ | |
468 | stub->insns[3] = 0xe820d002; /* bve,n (%r1) */ | |
469 | ||
470 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
471 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
6e1b9585 JB |
472 | break; |
473 | case ELF_STUB_DIRECT: | |
474 | stub->insns[0] = 0x20200000; /* ldil 0,%r1 */ | |
475 | stub->insns[1] = 0x34210000; /* ldo 0(%r1), %r1 */ | |
476 | stub->insns[2] = 0xe820d002; /* bve,n (%r1) */ | |
477 | ||
478 | stub->insns[0] |= reassemble_21(lrsel(value, addend)); | |
479 | stub->insns[1] |= reassemble_14(rrsel(value, addend)); | |
480 | break; | |
1da177e4 | 481 | } |
6e1b9585 | 482 | |
1da177e4 LT |
483 | #endif |
484 | ||
485 | return (Elf_Addr)stub; | |
486 | } | |
487 | ||
a8f44e38 | 488 | #ifndef CONFIG_64BIT |
1da177e4 LT |
489 | int apply_relocate_add(Elf_Shdr *sechdrs, |
490 | const char *strtab, | |
491 | unsigned int symindex, | |
492 | unsigned int relsec, | |
493 | struct module *me) | |
494 | { | |
495 | int i; | |
496 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
497 | Elf32_Sym *sym; | |
498 | Elf32_Word *loc; | |
499 | Elf32_Addr val; | |
500 | Elf32_Sword addend; | |
501 | Elf32_Addr dot; | |
c298be74 HD |
502 | Elf_Addr loc0; |
503 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 LT |
504 | //unsigned long dp = (unsigned long)$global$; |
505 | register unsigned long dp asm ("r27"); | |
506 | ||
6183d68b | 507 | pr_debug("Applying relocate section %u to %u\n", relsec, |
c298be74 | 508 | targetsec); |
1da177e4 LT |
509 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
510 | /* This is where to make the change */ | |
c298be74 | 511 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 512 | + rel[i].r_offset; |
c298be74 HD |
513 | /* This is the start of the target section */ |
514 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
515 | /* This is the symbol it is referring to */ |
516 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr | |
517 | + ELF32_R_SYM(rel[i].r_info); | |
518 | if (!sym->st_value) { | |
519 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
520 | me->name, strtab + sym->st_name); | |
521 | return -ENOENT; | |
522 | } | |
523 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; | |
524 | dot = (Elf32_Addr)loc & ~0x03; | |
525 | ||
526 | val = sym->st_value; | |
527 | addend = rel[i].r_addend; | |
528 | ||
529 | #if 0 | |
530 | #define r(t) ELF32_R_TYPE(rel[i].r_info)==t ? #t : | |
6183d68b | 531 | pr_debug("Symbol %s loc 0x%x val 0x%x addend 0x%x: %s\n", |
1da177e4 LT |
532 | strtab + sym->st_name, |
533 | (uint32_t)loc, val, addend, | |
534 | r(R_PARISC_PLABEL32) | |
535 | r(R_PARISC_DIR32) | |
536 | r(R_PARISC_DIR21L) | |
537 | r(R_PARISC_DIR14R) | |
538 | r(R_PARISC_SEGREL32) | |
539 | r(R_PARISC_DPREL21L) | |
540 | r(R_PARISC_DPREL14R) | |
541 | r(R_PARISC_PCREL17F) | |
542 | r(R_PARISC_PCREL22F) | |
543 | "UNKNOWN"); | |
544 | #undef r | |
545 | #endif | |
546 | ||
547 | switch (ELF32_R_TYPE(rel[i].r_info)) { | |
548 | case R_PARISC_PLABEL32: | |
549 | /* 32-bit function address */ | |
550 | /* no function descriptors... */ | |
551 | *loc = fsel(val, addend); | |
552 | break; | |
553 | case R_PARISC_DIR32: | |
554 | /* direct 32-bit ref */ | |
555 | *loc = fsel(val, addend); | |
556 | break; | |
557 | case R_PARISC_DIR21L: | |
558 | /* left 21 bits of effective address */ | |
559 | val = lrsel(val, addend); | |
560 | *loc = mask(*loc, 21) | reassemble_21(val); | |
561 | break; | |
562 | case R_PARISC_DIR14R: | |
563 | /* right 14 bits of effective address */ | |
564 | val = rrsel(val, addend); | |
565 | *loc = mask(*loc, 14) | reassemble_14(val); | |
566 | break; | |
567 | case R_PARISC_SEGREL32: | |
568 | /* 32-bit segment relative address */ | |
569 | /* See note about special handling of SEGREL32 at | |
570 | * the beginning of this file. | |
571 | */ | |
6183d68b | 572 | *loc = fsel(val, addend); |
1da177e4 | 573 | break; |
5f655322 MP |
574 | case R_PARISC_SECREL32: |
575 | /* 32-bit section relative address. */ | |
576 | *loc = fsel(val, addend); | |
577 | break; | |
1da177e4 LT |
578 | case R_PARISC_DPREL21L: |
579 | /* left 21 bit of relative address */ | |
580 | val = lrsel(val - dp, addend); | |
581 | *loc = mask(*loc, 21) | reassemble_21(val); | |
582 | break; | |
583 | case R_PARISC_DPREL14R: | |
584 | /* right 14 bit of relative address */ | |
585 | val = rrsel(val - dp, addend); | |
586 | *loc = mask(*loc, 14) | reassemble_14(val); | |
587 | break; | |
588 | case R_PARISC_PCREL17F: | |
589 | /* 17-bit PC relative address */ | |
c298be74 HD |
590 | /* calculate direct call offset */ |
591 | val += addend; | |
1da177e4 | 592 | val = (val - dot - 8)/4; |
c298be74 HD |
593 | if (!RELOC_REACHABLE(val, 17)) { |
594 | /* direct distance too far, create | |
595 | * stub entry instead */ | |
596 | val = get_stub(me, sym->st_value, addend, | |
597 | ELF_STUB_DIRECT, loc0, targetsec); | |
598 | val = (val - dot - 8)/4; | |
599 | CHECK_RELOC(val, 17); | |
600 | } | |
1da177e4 LT |
601 | *loc = (*loc & ~0x1f1ffd) | reassemble_17(val); |
602 | break; | |
603 | case R_PARISC_PCREL22F: | |
604 | /* 22-bit PC relative address; only defined for pa20 */ | |
c298be74 HD |
605 | /* calculate direct call offset */ |
606 | val += addend; | |
1da177e4 | 607 | val = (val - dot - 8)/4; |
c298be74 HD |
608 | if (!RELOC_REACHABLE(val, 22)) { |
609 | /* direct distance too far, create | |
610 | * stub entry instead */ | |
611 | val = get_stub(me, sym->st_value, addend, | |
612 | ELF_STUB_DIRECT, loc0, targetsec); | |
613 | val = (val - dot - 8)/4; | |
614 | CHECK_RELOC(val, 22); | |
615 | } | |
1da177e4 LT |
616 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
617 | break; | |
592570c9 HD |
618 | case R_PARISC_PCREL32: |
619 | /* 32-bit PC relative address */ | |
620 | *loc = val - dot - 8 + addend; | |
621 | break; | |
1da177e4 LT |
622 | |
623 | default: | |
624 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", | |
625 | me->name, ELF32_R_TYPE(rel[i].r_info)); | |
626 | return -ENOEXEC; | |
627 | } | |
628 | } | |
629 | ||
630 | return 0; | |
631 | } | |
632 | ||
633 | #else | |
634 | int apply_relocate_add(Elf_Shdr *sechdrs, | |
635 | const char *strtab, | |
636 | unsigned int symindex, | |
637 | unsigned int relsec, | |
638 | struct module *me) | |
639 | { | |
640 | int i; | |
641 | Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr; | |
642 | Elf64_Sym *sym; | |
643 | Elf64_Word *loc; | |
644 | Elf64_Xword *loc64; | |
645 | Elf64_Addr val; | |
646 | Elf64_Sxword addend; | |
647 | Elf64_Addr dot; | |
c298be74 HD |
648 | Elf_Addr loc0; |
649 | unsigned int targetsec = sechdrs[relsec].sh_info; | |
1da177e4 | 650 | |
6183d68b | 651 | pr_debug("Applying relocate section %u to %u\n", relsec, |
c298be74 | 652 | targetsec); |
1da177e4 LT |
653 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
654 | /* This is where to make the change */ | |
c298be74 | 655 | loc = (void *)sechdrs[targetsec].sh_addr |
1da177e4 | 656 | + rel[i].r_offset; |
c298be74 HD |
657 | /* This is the start of the target section */ |
658 | loc0 = sechdrs[targetsec].sh_addr; | |
1da177e4 LT |
659 | /* This is the symbol it is referring to */ |
660 | sym = (Elf64_Sym *)sechdrs[symindex].sh_addr | |
661 | + ELF64_R_SYM(rel[i].r_info); | |
662 | if (!sym->st_value) { | |
663 | printk(KERN_WARNING "%s: Unknown symbol %s\n", | |
664 | me->name, strtab + sym->st_name); | |
665 | return -ENOENT; | |
666 | } | |
667 | //dot = (sechdrs[relsec].sh_addr + rel->r_offset) & ~0x03; | |
668 | dot = (Elf64_Addr)loc & ~0x03; | |
669 | loc64 = (Elf64_Xword *)loc; | |
670 | ||
671 | val = sym->st_value; | |
672 | addend = rel[i].r_addend; | |
673 | ||
674 | #if 0 | |
675 | #define r(t) ELF64_R_TYPE(rel[i].r_info)==t ? #t : | |
676 | printk("Symbol %s loc %p val 0x%Lx addend 0x%Lx: %s\n", | |
677 | strtab + sym->st_name, | |
678 | loc, val, addend, | |
679 | r(R_PARISC_LTOFF14R) | |
680 | r(R_PARISC_LTOFF21L) | |
681 | r(R_PARISC_PCREL22F) | |
682 | r(R_PARISC_DIR64) | |
683 | r(R_PARISC_SEGREL32) | |
684 | r(R_PARISC_FPTR64) | |
685 | "UNKNOWN"); | |
686 | #undef r | |
687 | #endif | |
688 | ||
689 | switch (ELF64_R_TYPE(rel[i].r_info)) { | |
690 | case R_PARISC_LTOFF21L: | |
691 | /* LT-relative; left 21 bits */ | |
692 | val = get_got(me, val, addend); | |
6183d68b | 693 | pr_debug("LTOFF21L Symbol %s loc %p val %llx\n", |
1da177e4 LT |
694 | strtab + sym->st_name, |
695 | loc, val); | |
696 | val = lrsel(val, 0); | |
697 | *loc = mask(*loc, 21) | reassemble_21(val); | |
698 | break; | |
699 | case R_PARISC_LTOFF14R: | |
700 | /* L(ltoff(val+addend)) */ | |
701 | /* LT-relative; right 14 bits */ | |
702 | val = get_got(me, val, addend); | |
703 | val = rrsel(val, 0); | |
6183d68b | 704 | pr_debug("LTOFF14R Symbol %s loc %p val %llx\n", |
1da177e4 LT |
705 | strtab + sym->st_name, |
706 | loc, val); | |
707 | *loc = mask(*loc, 14) | reassemble_14(val); | |
708 | break; | |
709 | case R_PARISC_PCREL22F: | |
710 | /* PC-relative; 22 bits */ | |
6183d68b | 711 | pr_debug("PCREL22F Symbol %s loc %p val %llx\n", |
1da177e4 LT |
712 | strtab + sym->st_name, |
713 | loc, val); | |
c298be74 | 714 | val += addend; |
1da177e4 | 715 | /* can we reach it locally? */ |
ac3b4328 | 716 | if (within_module(val, me)) { |
c298be74 HD |
717 | /* this is the case where the symbol is local |
718 | * to the module, but in a different section, | |
719 | * so stub the jump in case it's more than 22 | |
720 | * bits away */ | |
721 | val = (val - dot - 8)/4; | |
722 | if (!RELOC_REACHABLE(val, 22)) { | |
723 | /* direct distance too far, create | |
724 | * stub entry instead */ | |
725 | val = get_stub(me, sym->st_value, | |
726 | addend, ELF_STUB_DIRECT, | |
727 | loc0, targetsec); | |
728 | } else { | |
729 | /* Ok, we can reach it directly. */ | |
730 | val = sym->st_value; | |
731 | val += addend; | |
732 | } | |
733 | } else { | |
734 | val = sym->st_value; | |
735 | if (strncmp(strtab + sym->st_name, "$$", 2) | |
1da177e4 | 736 | == 0) |
6e1b9585 | 737 | val = get_stub(me, val, addend, ELF_STUB_MILLI, |
c298be74 | 738 | loc0, targetsec); |
1da177e4 | 739 | else |
6e1b9585 | 740 | val = get_stub(me, val, addend, ELF_STUB_GOT, |
c298be74 | 741 | loc0, targetsec); |
1da177e4 | 742 | } |
6183d68b | 743 | pr_debug("STUB FOR %s loc %px, val %llx+%llx at %llx\n", |
1da177e4 LT |
744 | strtab + sym->st_name, loc, sym->st_value, |
745 | addend, val); | |
1da177e4 | 746 | val = (val - dot - 8)/4; |
c298be74 | 747 | CHECK_RELOC(val, 22); |
1da177e4 LT |
748 | *loc = (*loc & ~0x3ff1ffd) | reassemble_22(val); |
749 | break; | |
592570c9 HD |
750 | case R_PARISC_PCREL32: |
751 | /* 32-bit PC relative address */ | |
752 | *loc = val - dot - 8 + addend; | |
753 | break; | |
d2ba3b17 HD |
754 | case R_PARISC_PCREL64: |
755 | /* 64-bit PC relative address */ | |
756 | *loc64 = val - dot - 8 + addend; | |
757 | break; | |
1da177e4 LT |
758 | case R_PARISC_DIR64: |
759 | /* 64-bit effective address */ | |
760 | *loc64 = val + addend; | |
761 | break; | |
762 | case R_PARISC_SEGREL32: | |
763 | /* 32-bit segment relative address */ | |
764 | /* See note about special handling of SEGREL32 at | |
765 | * the beginning of this file. | |
766 | */ | |
6183d68b | 767 | *loc = fsel(val, addend); |
1da177e4 | 768 | break; |
5f655322 MP |
769 | case R_PARISC_SECREL32: |
770 | /* 32-bit section relative address. */ | |
771 | *loc = fsel(val, addend); | |
772 | break; | |
1da177e4 LT |
773 | case R_PARISC_FPTR64: |
774 | /* 64-bit function address */ | |
ac3b4328 | 775 | if (within_module(val + addend, me)) { |
1da177e4 | 776 | *loc64 = get_fdesc(me, val+addend); |
6183d68b | 777 | pr_debug("FDESC for %s at %llx points to %llx\n", |
1da177e4 LT |
778 | strtab + sym->st_name, *loc64, |
779 | ((Elf_Fdesc *)*loc64)->addr); | |
780 | } else { | |
781 | /* if the symbol is not local to this | |
782 | * module then val+addend is a pointer | |
783 | * to the function descriptor */ | |
6183d68b | 784 | pr_debug("Non local FPTR64 Symbol %s loc %p val %llx\n", |
1da177e4 LT |
785 | strtab + sym->st_name, |
786 | loc, val); | |
787 | *loc64 = val + addend; | |
788 | } | |
789 | break; | |
790 | ||
791 | default: | |
792 | printk(KERN_ERR "module %s: Unknown relocation: %Lu\n", | |
793 | me->name, ELF64_R_TYPE(rel[i].r_info)); | |
794 | return -ENOEXEC; | |
795 | } | |
796 | } | |
797 | return 0; | |
798 | } | |
799 | #endif | |
800 | ||
801 | static void | |
802 | register_unwind_table(struct module *me, | |
803 | const Elf_Shdr *sechdrs) | |
804 | { | |
805 | unsigned char *table, *end; | |
806 | unsigned long gp; | |
807 | ||
808 | if (!me->arch.unwind_section) | |
809 | return; | |
810 | ||
811 | table = (unsigned char *)sechdrs[me->arch.unwind_section].sh_addr; | |
812 | end = table + sechdrs[me->arch.unwind_section].sh_size; | |
ac3b4328 | 813 | gp = (Elf_Addr)me->mem[MOD_TEXT].base + me->arch.got_offset; |
1da177e4 | 814 | |
6183d68b | 815 | pr_debug("register_unwind_table(), sect = %d at 0x%p - 0x%p (gp=0x%lx)\n", |
1da177e4 LT |
816 | me->arch.unwind_section, table, end, gp); |
817 | me->arch.unwind = unwind_table_add(me->name, 0, gp, table, end); | |
818 | } | |
819 | ||
820 | static void | |
821 | deregister_unwind_table(struct module *me) | |
822 | { | |
823 | if (me->arch.unwind) | |
824 | unwind_table_remove(me->arch.unwind); | |
825 | } | |
826 | ||
827 | int module_finalize(const Elf_Ehdr *hdr, | |
828 | const Elf_Shdr *sechdrs, | |
829 | struct module *me) | |
830 | { | |
831 | int i; | |
832 | unsigned long nsyms; | |
833 | const char *strtab = NULL; | |
8cc28269 HD |
834 | const Elf_Shdr *s; |
835 | char *secstrings; | |
0e466703 | 836 | int symindex __maybe_unused = -1; |
1da177e4 LT |
837 | Elf_Sym *newptr, *oldptr; |
838 | Elf_Shdr *symhdr = NULL; | |
839 | #ifdef DEBUG | |
840 | Elf_Fdesc *entry; | |
841 | u32 *addr; | |
842 | ||
843 | entry = (Elf_Fdesc *)me->init; | |
844 | printk("FINALIZE, ->init FPTR is %p, GP %lx ADDR %lx\n", entry, | |
845 | entry->gp, entry->addr); | |
846 | addr = (u32 *)entry->addr; | |
847 | printk("INSNS: %x %x %x %x\n", | |
848 | addr[0], addr[1], addr[2], addr[3]); | |
c298be74 | 849 | printk("got entries used %ld, gots max %ld\n" |
1da177e4 | 850 | "fdescs used %ld, fdescs max %ld\n", |
1da177e4 LT |
851 | me->arch.got_count, me->arch.got_max, |
852 | me->arch.fdesc_count, me->arch.fdesc_max); | |
853 | #endif | |
854 | ||
855 | register_unwind_table(me, sechdrs); | |
856 | ||
857 | /* haven't filled in me->symtab yet, so have to find it | |
858 | * ourselves */ | |
859 | for (i = 1; i < hdr->e_shnum; i++) { | |
860 | if(sechdrs[i].sh_type == SHT_SYMTAB | |
fe579c69 | 861 | && (sechdrs[i].sh_flags & SHF_ALLOC)) { |
1da177e4 | 862 | int strindex = sechdrs[i].sh_link; |
6ca63662 | 863 | symindex = i; |
1da177e4 LT |
864 | /* FIXME: AWFUL HACK |
865 | * The cast is to drop the const from | |
866 | * the sechdrs pointer */ | |
867 | symhdr = (Elf_Shdr *)&sechdrs[i]; | |
868 | strtab = (char *)sechdrs[strindex].sh_addr; | |
869 | break; | |
870 | } | |
871 | } | |
872 | ||
6183d68b | 873 | pr_debug("module %s: strtab %p, symhdr %p\n", |
1da177e4 LT |
874 | me->name, strtab, symhdr); |
875 | ||
876 | if(me->arch.got_count > MAX_GOTS) { | |
f8fc18a1 HD |
877 | printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n", |
878 | me->name, me->arch.got_count, MAX_GOTS); | |
1da177e4 LT |
879 | return -EINVAL; |
880 | } | |
c298be74 HD |
881 | |
882 | kfree(me->arch.section); | |
883 | me->arch.section = NULL; | |
884 | ||
1da177e4 LT |
885 | /* no symbol table */ |
886 | if(symhdr == NULL) | |
887 | return 0; | |
888 | ||
889 | oldptr = (void *)symhdr->sh_addr; | |
890 | newptr = oldptr + 1; /* we start counting at 1 */ | |
891 | nsyms = symhdr->sh_size / sizeof(Elf_Sym); | |
6183d68b | 892 | pr_debug("OLD num_symtab %lu\n", nsyms); |
1da177e4 LT |
893 | |
894 | for (i = 1; i < nsyms; i++) { | |
895 | oldptr++; /* note, count starts at 1 so preincrement */ | |
896 | if(strncmp(strtab + oldptr->st_name, | |
897 | ".L", 2) == 0) | |
898 | continue; | |
899 | ||
900 | if(newptr != oldptr) | |
901 | *newptr++ = *oldptr; | |
902 | else | |
903 | newptr++; | |
904 | ||
905 | } | |
906 | nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; | |
6183d68b | 907 | pr_debug("NEW num_symtab %lu\n", nsyms); |
1da177e4 | 908 | symhdr->sh_size = nsyms * sizeof(Elf_Sym); |
8cc28269 HD |
909 | |
910 | /* find .altinstructions section */ | |
911 | secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; | |
912 | for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { | |
913 | void *aseg = (void *) s->sh_addr; | |
914 | char *secname = secstrings + s->sh_name; | |
915 | ||
916 | if (!strcmp(".altinstructions", secname)) | |
917 | /* patch .altinstructions */ | |
918 | apply_alternatives(aseg, aseg + s->sh_size, me->name); | |
8cc28269 | 919 | |
a1326b17 | 920 | #ifdef CONFIG_DYNAMIC_FTRACE |
6ca63662 SS |
921 | /* For 32 bit kernels we're compiling modules with |
922 | * -ffunction-sections so we must relocate the addresses in the | |
a1326b17 | 923 | * ftrace callsite section. |
6ca63662 | 924 | */ |
a1326b17 MR |
925 | if (symindex != -1 && !strcmp(secname, FTRACE_CALLSITE_SECTION)) { |
926 | int err; | |
6ca63662 SS |
927 | if (s->sh_type == SHT_REL) |
928 | err = apply_relocate((Elf_Shdr *)sechdrs, | |
929 | strtab, symindex, | |
930 | s - sechdrs, me); | |
931 | else if (s->sh_type == SHT_RELA) | |
932 | err = apply_relocate_add((Elf_Shdr *)sechdrs, | |
933 | strtab, symindex, | |
934 | s - sechdrs, me); | |
935 | if (err) | |
936 | return err; | |
937 | } | |
a1326b17 | 938 | #endif |
6ca63662 | 939 | } |
5336377d | 940 | return 0; |
1da177e4 LT |
941 | } |
942 | ||
943 | void module_arch_cleanup(struct module *mod) | |
944 | { | |
945 | deregister_unwind_table(mod); | |
946 | } | |
1705bd6a SS |
947 | |
948 | #ifdef CONFIG_64BIT | |
949 | void *dereference_module_function_descriptor(struct module *mod, void *ptr) | |
950 | { | |
ac3b4328 | 951 | unsigned long start_opd = (Elf64_Addr)mod->mem[MOD_TEXT].base + |
1705bd6a SS |
952 | mod->arch.fdesc_offset; |
953 | unsigned long end_opd = start_opd + | |
954 | mod->arch.fdesc_count * sizeof(Elf64_Fdesc); | |
955 | ||
956 | if (ptr < (void *)start_opd || ptr >= (void *)end_opd) | |
957 | return ptr; | |
958 | ||
959 | return dereference_function_descriptor(ptr); | |
960 | } | |
961 | #endif |