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ARM: mm: avoid taking ASID spinlock on fastpath
[linux/fpc-iii.git] / arch / s390 / kernel / module.c
blob4610deafd953e0434f062ad359e3d53edb81426e
1 /*
2 * Kernel module help for s390.
3 *
4 * S390 version
5 * Copyright IBM Corp. 2002, 2003
6 * Author(s): Arnd Bergmann (arndb@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 *
9 * based on i386 version
10 * Copyright (C) 2001 Rusty Russell.
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 #include <linux/module.h>
27 #include <linux/elf.h>
28 #include <linux/vmalloc.h>
29 #include <linux/fs.h>
30 #include <linux/string.h>
31 #include <linux/kernel.h>
32 #include <linux/moduleloader.h>
33 #include <linux/bug.h>
34
35 #if 0
36 #define DEBUGP printk
37 #else
38 #define DEBUGP(fmt , ...)
39 #endif
40
41 #ifndef CONFIG_64BIT
42 #define PLT_ENTRY_SIZE 12
43 #else /* CONFIG_64BIT */
44 #define PLT_ENTRY_SIZE 20
45 #endif /* CONFIG_64BIT */
46
47 #ifdef CONFIG_64BIT
48 void *module_alloc(unsigned long size)
49 {
50 if (PAGE_ALIGN(size) > MODULES_LEN)
51 return NULL;
52 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
53 GFP_KERNEL, PAGE_KERNEL, -1,
54 __builtin_return_address(0));
55 }
56 #endif
57
58 /* Free memory returned from module_alloc */
59 void module_free(struct module *mod, void *module_region)
60 {
61 if (mod) {
62 vfree(mod->arch.syminfo);
63 mod->arch.syminfo = NULL;
64 }
65 vfree(module_region);
66 }
67
68 static void
69 check_rela(Elf_Rela *rela, struct module *me)
70 {
71 struct mod_arch_syminfo *info;
72
73 info = me->arch.syminfo + ELF_R_SYM (rela->r_info);
74 switch (ELF_R_TYPE (rela->r_info)) {
75 case R_390_GOT12: /* 12 bit GOT offset. */
76 case R_390_GOT16: /* 16 bit GOT offset. */
77 case R_390_GOT20: /* 20 bit GOT offset. */
78 case R_390_GOT32: /* 32 bit GOT offset. */
79 case R_390_GOT64: /* 64 bit GOT offset. */
80 case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
81 case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
82 case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
83 case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
84 case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
85 case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
86 case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
87 if (info->got_offset == -1UL) {
88 info->got_offset = me->arch.got_size;
89 me->arch.got_size += sizeof(void*);
90 }
91 break;
92 case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
93 case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
94 case R_390_PLT32: /* 32 bit PC relative PLT address. */
95 case R_390_PLT64: /* 64 bit PC relative PLT address. */
96 case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
97 case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
98 case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
99 if (info->plt_offset == -1UL) {
100 info->plt_offset = me->arch.plt_size;
101 me->arch.plt_size += PLT_ENTRY_SIZE;
102 }
103 break;
104 case R_390_COPY:
105 case R_390_GLOB_DAT:
106 case R_390_JMP_SLOT:
107 case R_390_RELATIVE:
108 /* Only needed if we want to support loading of
109 modules linked with -shared. */
110 break;
111 }
112 }
113
114 /*
115 * Account for GOT and PLT relocations. We can't add sections for
116 * got and plt but we can increase the core module size.
117 */
118 int
119 module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
120 char *secstrings, struct module *me)
121 {
122 Elf_Shdr *symtab;
123 Elf_Sym *symbols;
124 Elf_Rela *rela;
125 char *strings;
126 int nrela, i, j;
127
128 /* Find symbol table and string table. */
129 symtab = NULL;
130 for (i = 0; i < hdr->e_shnum; i++)
131 switch (sechdrs[i].sh_type) {
132 case SHT_SYMTAB:
133 symtab = sechdrs + i;
134 break;
135 }
136 if (!symtab) {
137 printk(KERN_ERR "module %s: no symbol table\n", me->name);
138 return -ENOEXEC;
139 }
140
141 /* Allocate one syminfo structure per symbol. */
142 me->arch.nsyms = symtab->sh_size / sizeof(Elf_Sym);
143 me->arch.syminfo = vmalloc(me->arch.nsyms *
144 sizeof(struct mod_arch_syminfo));
145 if (!me->arch.syminfo)
146 return -ENOMEM;
147 symbols = (void *) hdr + symtab->sh_offset;
148 strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
149 for (i = 0; i < me->arch.nsyms; i++) {
150 if (symbols[i].st_shndx == SHN_UNDEF &&
151 strcmp(strings + symbols[i].st_name,
152 "_GLOBAL_OFFSET_TABLE_") == 0)
153 /* "Define" it as absolute. */
154 symbols[i].st_shndx = SHN_ABS;
155 me->arch.syminfo[i].got_offset = -1UL;
156 me->arch.syminfo[i].plt_offset = -1UL;
157 me->arch.syminfo[i].got_initialized = 0;
158 me->arch.syminfo[i].plt_initialized = 0;
159 }
160
161 /* Search for got/plt relocations. */
162 me->arch.got_size = me->arch.plt_size = 0;
163 for (i = 0; i < hdr->e_shnum; i++) {
164 if (sechdrs[i].sh_type != SHT_RELA)
165 continue;
166 nrela = sechdrs[i].sh_size / sizeof(Elf_Rela);
167 rela = (void *) hdr + sechdrs[i].sh_offset;
168 for (j = 0; j < nrela; j++)
169 check_rela(rela + j, me);
170 }
171
172 /* Increase core size by size of got & plt and set start
173 offsets for got and plt. */
174 me->core_size = ALIGN(me->core_size, 4);
175 me->arch.got_offset = me->core_size;
176 me->core_size += me->arch.got_size;
177 me->arch.plt_offset = me->core_size;
178 me->core_size += me->arch.plt_size;
179 return 0;
180 }
181
182 static int
183 apply_rela(Elf_Rela *rela, Elf_Addr base, Elf_Sym *symtab,
184 struct module *me)
185 {
186 struct mod_arch_syminfo *info;
187 Elf_Addr loc, val;
188 int r_type, r_sym;
189
190 /* This is where to make the change */
191 loc = base + rela->r_offset;
192 /* This is the symbol it is referring to. Note that all
193 undefined symbols have been resolved. */
194 r_sym = ELF_R_SYM(rela->r_info);
195 r_type = ELF_R_TYPE(rela->r_info);
196 info = me->arch.syminfo + r_sym;
197 val = symtab[r_sym].st_value;
198
199 switch (r_type) {
200 case R_390_8: /* Direct 8 bit. */
201 case R_390_12: /* Direct 12 bit. */
202 case R_390_16: /* Direct 16 bit. */
203 case R_390_20: /* Direct 20 bit. */
204 case R_390_32: /* Direct 32 bit. */
205 case R_390_64: /* Direct 64 bit. */
206 val += rela->r_addend;
207 if (r_type == R_390_8)
208 *(unsigned char *) loc = val;
209 else if (r_type == R_390_12)
210 *(unsigned short *) loc = (val & 0xfff) |
211 (*(unsigned short *) loc & 0xf000);
212 else if (r_type == R_390_16)
213 *(unsigned short *) loc = val;
214 else if (r_type == R_390_20)
215 *(unsigned int *) loc =
216 (*(unsigned int *) loc & 0xf00000ff) |
217 (val & 0xfff) << 16 | (val & 0xff000) >> 4;
218 else if (r_type == R_390_32)
219 *(unsigned int *) loc = val;
220 else if (r_type == R_390_64)
221 *(unsigned long *) loc = val;
222 break;
223 case R_390_PC16: /* PC relative 16 bit. */
224 case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
225 case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
226 case R_390_PC32: /* PC relative 32 bit. */
227 case R_390_PC64: /* PC relative 64 bit. */
228 val += rela->r_addend - loc;
229 if (r_type == R_390_PC16)
230 *(unsigned short *) loc = val;
231 else if (r_type == R_390_PC16DBL)
232 *(unsigned short *) loc = val >> 1;
233 else if (r_type == R_390_PC32DBL)
234 *(unsigned int *) loc = val >> 1;
235 else if (r_type == R_390_PC32)
236 *(unsigned int *) loc = val;
237 else if (r_type == R_390_PC64)
238 *(unsigned long *) loc = val;
239 break;
240 case R_390_GOT12: /* 12 bit GOT offset. */
241 case R_390_GOT16: /* 16 bit GOT offset. */
242 case R_390_GOT20: /* 20 bit GOT offset. */
243 case R_390_GOT32: /* 32 bit GOT offset. */
244 case R_390_GOT64: /* 64 bit GOT offset. */
245 case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
246 case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
247 case R_390_GOTPLT20: /* 20 bit offset to jump slot. */
248 case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
249 case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
250 case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
251 case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
252 if (info->got_initialized == 0) {
253 Elf_Addr *gotent;
254
255 gotent = me->module_core + me->arch.got_offset +
256 info->got_offset;
257 *gotent = val;
258 info->got_initialized = 1;
259 }
260 val = info->got_offset + rela->r_addend;
261 if (r_type == R_390_GOT12 ||
262 r_type == R_390_GOTPLT12)
263 *(unsigned short *) loc = (val & 0xfff) |
264 (*(unsigned short *) loc & 0xf000);
265 else if (r_type == R_390_GOT16 ||
266 r_type == R_390_GOTPLT16)
267 *(unsigned short *) loc = val;
268 else if (r_type == R_390_GOT20 ||
269 r_type == R_390_GOTPLT20)
270 *(unsigned int *) loc =
271 (*(unsigned int *) loc & 0xf00000ff) |
272 (val & 0xfff) << 16 | (val & 0xff000) >> 4;
273 else if (r_type == R_390_GOT32 ||
274 r_type == R_390_GOTPLT32)
275 *(unsigned int *) loc = val;
276 else if (r_type == R_390_GOTENT ||
277 r_type == R_390_GOTPLTENT)
278 *(unsigned int *) loc =
279 (val + (Elf_Addr) me->module_core - loc) >> 1;
280 else if (r_type == R_390_GOT64 ||
281 r_type == R_390_GOTPLT64)
282 *(unsigned long *) loc = val;
283 break;
284 case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
285 case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
286 case R_390_PLT32: /* 32 bit PC relative PLT address. */
287 case R_390_PLT64: /* 64 bit PC relative PLT address. */
288 case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
289 case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
290 case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
291 if (info->plt_initialized == 0) {
292 unsigned int *ip;
293 ip = me->module_core + me->arch.plt_offset +
294 info->plt_offset;
295 #ifndef CONFIG_64BIT
296 ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */
297 ip[1] = 0x100607f1;
298 ip[2] = val;
299 #else /* CONFIG_64BIT */
300 ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
301 ip[1] = 0x100a0004;
302 ip[2] = 0x07f10000;
303 ip[3] = (unsigned int) (val >> 32);
304 ip[4] = (unsigned int) val;
305 #endif /* CONFIG_64BIT */
306 info->plt_initialized = 1;
307 }
308 if (r_type == R_390_PLTOFF16 ||
309 r_type == R_390_PLTOFF32 ||
310 r_type == R_390_PLTOFF64)
311 val = me->arch.plt_offset - me->arch.got_offset +
312 info->plt_offset + rela->r_addend;
313 else {
314 if (!((r_type == R_390_PLT16DBL &&
315 val - loc + 0xffffUL < 0x1ffffeUL) ||
316 (r_type == R_390_PLT32DBL &&
317 val - loc + 0xffffffffULL < 0x1fffffffeULL)))
318 val = (Elf_Addr) me->module_core +
319 me->arch.plt_offset +
320 info->plt_offset;
321 val += rela->r_addend - loc;
322 }
323 if (r_type == R_390_PLT16DBL)
324 *(unsigned short *) loc = val >> 1;
325 else if (r_type == R_390_PLTOFF16)
326 *(unsigned short *) loc = val;
327 else if (r_type == R_390_PLT32DBL)
328 *(unsigned int *) loc = val >> 1;
329 else if (r_type == R_390_PLT32 ||
330 r_type == R_390_PLTOFF32)
331 *(unsigned int *) loc = val;
332 else if (r_type == R_390_PLT64 ||
333 r_type == R_390_PLTOFF64)
334 *(unsigned long *) loc = val;
335 break;
336 case R_390_GOTOFF16: /* 16 bit offset to GOT. */
337 case R_390_GOTOFF32: /* 32 bit offset to GOT. */
338 case R_390_GOTOFF64: /* 64 bit offset to GOT. */
339 val = val + rela->r_addend -
340 ((Elf_Addr) me->module_core + me->arch.got_offset);
341 if (r_type == R_390_GOTOFF16)
342 *(unsigned short *) loc = val;
343 else if (r_type == R_390_GOTOFF32)
344 *(unsigned int *) loc = val;
345 else if (r_type == R_390_GOTOFF64)
346 *(unsigned long *) loc = val;
347 break;
348 case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
349 case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
350 val = (Elf_Addr) me->module_core + me->arch.got_offset +
351 rela->r_addend - loc;
352 if (r_type == R_390_GOTPC)
353 *(unsigned int *) loc = val;
354 else if (r_type == R_390_GOTPCDBL)
355 *(unsigned int *) loc = val >> 1;
356 break;
357 case R_390_COPY:
358 case R_390_GLOB_DAT: /* Create GOT entry. */
359 case R_390_JMP_SLOT: /* Create PLT entry. */
360 case R_390_RELATIVE: /* Adjust by program base. */
361 /* Only needed if we want to support loading of
362 modules linked with -shared. */
363 break;
364 default:
365 printk(KERN_ERR "module %s: Unknown relocation: %u\n",
366 me->name, r_type);
367 return -ENOEXEC;
368 }
369 return 0;
370 }
371
372 int
373 apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
374 unsigned int symindex, unsigned int relsec,
375 struct module *me)
376 {
377 Elf_Addr base;
378 Elf_Sym *symtab;
379 Elf_Rela *rela;
380 unsigned long i, n;
381 int rc;
382
383 DEBUGP("Applying relocate section %u to %u\n",
384 relsec, sechdrs[relsec].sh_info);
385 base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
386 symtab = (Elf_Sym *) sechdrs[symindex].sh_addr;
387 rela = (Elf_Rela *) sechdrs[relsec].sh_addr;
388 n = sechdrs[relsec].sh_size / sizeof(Elf_Rela);
389
390 for (i = 0; i < n; i++, rela++) {
391 rc = apply_rela(rela, base, symtab, me);
392 if (rc)
393 return rc;
394 }
395 return 0;
396 }
397
398 int module_finalize(const Elf_Ehdr *hdr,
399 const Elf_Shdr *sechdrs,
400 struct module *me)
401 {
402 vfree(me->arch.syminfo);
403 me->arch.syminfo = NULL;
404 return 0;
405 }
Linux with added FPC-III support