1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2004, 2005 MIPS Technologies, Inc. All rights reserved. 7 * Copyright (C) 2013 Imagination Technologies Ltd. 8 * 9 * VPE support module for loading a MIPS SP program into VPE1. The SP 10 * environment is rather simple since there are no TLBs. It needs 11 * to be relocatable (or partially linked). Initialize your stack in 12 * the startup-code. The loader looks for the symbol __start and sets 13 * up the execution to resume from there. To load and run, simply do 14 * a cat SP 'binary' to the /dev/vpe1 device. 15 */ 16 #include <linux/kernel.h> 17 #include <linux/device.h> 18 #include <linux/fs.h> 19 #include <linux/init.h> 20 #include <linux/slab.h> 21 #include <linux/list.h> 22 #include <linux/vmalloc.h> 23 #include <linux/elf.h> 24 #include <linux/seq_file.h> 25 #include <linux/syscalls.h> 26 #include <linux/moduleloader.h> 27 #include <linux/interrupt.h> 28 #include <linux/poll.h> 29 #include <linux/memblock.h> 30 #include <asm/mipsregs.h> 31 #include <asm/mipsmtregs.h> 32 #include <asm/cacheflush.h> 33 #include <linux/atomic.h> 34 #include <asm/mips_mt.h> 35 #include <asm/processor.h> 36 #include <asm/vpe.h> 37 38 #ifndef ARCH_SHF_SMALL 39 #define ARCH_SHF_SMALL 0 40 #endif 41 42 /* If this is set, the section belongs in the init part of the module */ 43 #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) 44 45 struct vpe_control vpecontrol = { 46 .vpe_list_lock = __SPIN_LOCK_UNLOCKED(vpe_list_lock), 47 .vpe_list = LIST_HEAD_INIT(vpecontrol.vpe_list), 48 .tc_list_lock = __SPIN_LOCK_UNLOCKED(tc_list_lock), 49 .tc_list = LIST_HEAD_INIT(vpecontrol.tc_list) 50 }; 51 52 /* get the vpe associated with this minor */ 53 struct vpe *get_vpe(int minor) 54 { 55 struct vpe *res, *v; 56 57 if (!cpu_has_mipsmt) 58 return NULL; 59 60 res = NULL; 61 spin_lock(&vpecontrol.vpe_list_lock); 62 list_for_each_entry(v, &vpecontrol.vpe_list, list) { 63 if (v->minor == VPE_MODULE_MINOR) { 64 res = v; 65 break; 66 } 67 } 68 spin_unlock(&vpecontrol.vpe_list_lock); 69 70 return res; 71 } 72 73 /* get the vpe associated with this minor */ 74 struct tc *get_tc(int index) 75 { 76 struct tc *res, *t; 77 78 res = NULL; 79 spin_lock(&vpecontrol.tc_list_lock); 80 list_for_each_entry(t, &vpecontrol.tc_list, list) { 81 if (t->index == index) { 82 res = t; 83 break; 84 } 85 } 86 spin_unlock(&vpecontrol.tc_list_lock); 87 88 return res; 89 } 90 91 /* allocate a vpe and associate it with this minor (or index) */ 92 struct vpe *alloc_vpe(int minor) 93 { 94 struct vpe *v; 95 96 v = kzalloc(sizeof(struct vpe), GFP_KERNEL); 97 if (v == NULL) 98 goto out; 99 100 INIT_LIST_HEAD(&v->tc); 101 spin_lock(&vpecontrol.vpe_list_lock); 102 list_add_tail(&v->list, &vpecontrol.vpe_list); 103 spin_unlock(&vpecontrol.vpe_list_lock); 104 105 INIT_LIST_HEAD(&v->notify); 106 v->minor = VPE_MODULE_MINOR; 107 108 out: 109 return v; 110 } 111 112 /* allocate a tc. At startup only tc0 is running, all other can be halted. */ 113 struct tc *alloc_tc(int index) 114 { 115 struct tc *tc; 116 117 tc = kzalloc(sizeof(struct tc), GFP_KERNEL); 118 if (tc == NULL) 119 goto out; 120 121 INIT_LIST_HEAD(&tc->tc); 122 tc->index = index; 123 124 spin_lock(&vpecontrol.tc_list_lock); 125 list_add_tail(&tc->list, &vpecontrol.tc_list); 126 spin_unlock(&vpecontrol.tc_list_lock); 127 128 out: 129 return tc; 130 } 131 132 /* clean up and free everything */ 133 void release_vpe(struct vpe *v) 134 { 135 list_del(&v->list); 136 if (v->load_addr) 137 release_progmem(v->load_addr); 138 kfree(v); 139 } 140 141 /* Find some VPE program space */ 142 void *alloc_progmem(unsigned long len) 143 { 144 void *addr; 145 146 #ifdef CONFIG_MIPS_VPE_LOADER_TOM 147 /* 148 * This means you must tell Linux to use less memory than you 149 * physically have, for example by passing a mem= boot argument. 150 */ 151 addr = pfn_to_kaddr(max_low_pfn); 152 memset(addr, 0, len); 153 #else 154 /* simple grab some mem for now */ 155 addr = kzalloc(len, GFP_KERNEL); 156 #endif 157 158 return addr; 159 } 160 161 void release_progmem(void *ptr) 162 { 163 #ifndef CONFIG_MIPS_VPE_LOADER_TOM 164 kfree(ptr); 165 #endif 166 } 167 168 /* Update size with this section: return offset. */ 169 static long get_offset(unsigned long *size, Elf_Shdr *sechdr) 170 { 171 long ret; 172 173 ret = ALIGN(*size, sechdr->sh_addralign ? : 1); 174 *size = ret + sechdr->sh_size; 175 return ret; 176 } 177 178 /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld 179 might -- code, read-only data, read-write data, small data. Tally 180 sizes, and place the offsets into sh_entsize fields: high bit means it 181 belongs in init. */ 182 static void layout_sections(struct module *mod, const Elf_Ehdr *hdr, 183 Elf_Shdr *sechdrs, const char *secstrings) 184 { 185 static unsigned long const masks[][2] = { 186 /* NOTE: all executable code must be the first section 187 * in this array; otherwise modify the text_size 188 * finder in the two loops below */ 189 {SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL}, 190 {SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL}, 191 {SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL}, 192 {ARCH_SHF_SMALL | SHF_ALLOC, 0} 193 }; 194 unsigned int m, i; 195 196 for (i = 0; i < hdr->e_shnum; i++) 197 sechdrs[i].sh_entsize = ~0UL; 198 199 for (m = 0; m < ARRAY_SIZE(masks); ++m) { 200 for (i = 0; i < hdr->e_shnum; ++i) { 201 Elf_Shdr *s = &sechdrs[i]; 202 struct module_memory *mod_mem; 203 204 mod_mem = &mod->mem[MOD_TEXT]; 205 206 if ((s->sh_flags & masks[m][0]) != masks[m][0] 207 || (s->sh_flags & masks[m][1]) 208 || s->sh_entsize != ~0UL) 209 continue; 210 s->sh_entsize = 211 get_offset((unsigned long *)&mod_mem->size, s); 212 } 213 } 214 } 215 216 /* from module-elf32.c, but subverted a little */ 217 218 struct mips_hi16 { 219 struct mips_hi16 *next; 220 Elf32_Addr *addr; 221 Elf32_Addr value; 222 }; 223 224 static struct mips_hi16 *mips_hi16_list; 225 static unsigned int gp_offs, gp_addr; 226 227 static int apply_r_mips_none(struct module *me, uint32_t *location, 228 Elf32_Addr v) 229 { 230 return 0; 231 } 232 233 static int apply_r_mips_gprel16(struct module *me, uint32_t *location, 234 Elf32_Addr v) 235 { 236 int rel; 237 238 if (!(*location & 0xffff)) { 239 rel = (int)v - gp_addr; 240 } else { 241 /* .sbss + gp(relative) + offset */ 242 /* kludge! */ 243 rel = (int)(short)((int)v + gp_offs + 244 (int)(short)(*location & 0xffff) - gp_addr); 245 } 246 247 if ((rel > 32768) || (rel < -32768)) { 248 pr_debug("VPE loader: apply_r_mips_gprel16: relative address 0x%x out of range of gp register\n", 249 rel); 250 return -ENOEXEC; 251 } 252 253 *location = (*location & 0xffff0000) | (rel & 0xffff); 254 255 return 0; 256 } 257 258 static int apply_r_mips_pc16(struct module *me, uint32_t *location, 259 Elf32_Addr v) 260 { 261 int rel; 262 rel = (((unsigned int)v - (unsigned int)location)); 263 rel >>= 2; /* because the offset is in _instructions_ not bytes. */ 264 rel -= 1; /* and one instruction less due to the branch delay slot. */ 265 266 if ((rel > 32768) || (rel < -32768)) { 267 pr_debug("VPE loader: apply_r_mips_pc16: relative address out of range 0x%x\n", 268 rel); 269 return -ENOEXEC; 270 } 271 272 *location = (*location & 0xffff0000) | (rel & 0xffff); 273 274 return 0; 275 } 276 277 static int apply_r_mips_32(struct module *me, uint32_t *location, 278 Elf32_Addr v) 279 { 280 *location += v; 281 282 return 0; 283 } 284 285 static int apply_r_mips_26(struct module *me, uint32_t *location, 286 Elf32_Addr v) 287 { 288 if (v % 4) { 289 pr_debug("VPE loader: apply_r_mips_26: unaligned relocation\n"); 290 return -ENOEXEC; 291 } 292 293 /* 294 * Not desperately convinced this is a good check of an overflow condition 295 * anyway. But it gets in the way of handling undefined weak symbols which 296 * we want to set to zero. 297 * if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { 298 * printk(KERN_ERR 299 * "module %s: relocation overflow\n", 300 * me->name); 301 * return -ENOEXEC; 302 * } 303 */ 304 305 *location = (*location & ~0x03ffffff) | 306 ((*location + (v >> 2)) & 0x03ffffff); 307 return 0; 308 } 309 310 static int apply_r_mips_hi16(struct module *me, uint32_t *location, 311 Elf32_Addr v) 312 { 313 struct mips_hi16 *n; 314 315 /* 316 * We cannot relocate this one now because we don't know the value of 317 * the carry we need to add. Save the information, and let LO16 do the 318 * actual relocation. 319 */ 320 n = kmalloc(sizeof(*n), GFP_KERNEL); 321 if (!n) 322 return -ENOMEM; 323 324 n->addr = location; 325 n->value = v; 326 n->next = mips_hi16_list; 327 mips_hi16_list = n; 328 329 return 0; 330 } 331 332 static int apply_r_mips_lo16(struct module *me, uint32_t *location, 333 Elf32_Addr v) 334 { 335 unsigned long insnlo = *location; 336 Elf32_Addr val, vallo; 337 struct mips_hi16 *l, *next; 338 339 /* Sign extend the addend we extract from the lo insn. */ 340 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; 341 342 if (mips_hi16_list != NULL) { 343 344 l = mips_hi16_list; 345 while (l != NULL) { 346 unsigned long insn; 347 348 /* 349 * The value for the HI16 had best be the same. 350 */ 351 if (v != l->value) { 352 pr_debug("VPE loader: apply_r_mips_lo16/hi16: inconsistent value information\n"); 353 goto out_free; 354 } 355 356 /* 357 * Do the HI16 relocation. Note that we actually don't 358 * need to know anything about the LO16 itself, except 359 * where to find the low 16 bits of the addend needed 360 * by the LO16. 361 */ 362 insn = *l->addr; 363 val = ((insn & 0xffff) << 16) + vallo; 364 val += v; 365 366 /* 367 * Account for the sign extension that will happen in 368 * the low bits. 369 */ 370 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; 371 372 insn = (insn & ~0xffff) | val; 373 *l->addr = insn; 374 375 next = l->next; 376 kfree(l); 377 l = next; 378 } 379 380 mips_hi16_list = NULL; 381 } 382 383 /* 384 * Ok, we're done with the HI16 relocs. Now deal with the LO16. 385 */ 386 val = v + vallo; 387 insnlo = (insnlo & ~0xffff) | (val & 0xffff); 388 *location = insnlo; 389 390 return 0; 391 392 out_free: 393 while (l != NULL) { 394 next = l->next; 395 kfree(l); 396 l = next; 397 } 398 mips_hi16_list = NULL; 399 400 return -ENOEXEC; 401 } 402 403 static int (*reloc_handlers[]) (struct module *me, uint32_t *location, 404 Elf32_Addr v) = { 405 [R_MIPS_NONE] = apply_r_mips_none, 406 [R_MIPS_32] = apply_r_mips_32, 407 [R_MIPS_26] = apply_r_mips_26, 408 [R_MIPS_HI16] = apply_r_mips_hi16, 409 [R_MIPS_LO16] = apply_r_mips_lo16, 410 [R_MIPS_GPREL16] = apply_r_mips_gprel16, 411 [R_MIPS_PC16] = apply_r_mips_pc16 412 }; 413 414 static char *rstrs[] = { 415 [R_MIPS_NONE] = "MIPS_NONE", 416 [R_MIPS_32] = "MIPS_32", 417 [R_MIPS_26] = "MIPS_26", 418 [R_MIPS_HI16] = "MIPS_HI16", 419 [R_MIPS_LO16] = "MIPS_LO16", 420 [R_MIPS_GPREL16] = "MIPS_GPREL16", 421 [R_MIPS_PC16] = "MIPS_PC16" 422 }; 423 424 static int apply_relocations(Elf32_Shdr *sechdrs, 425 const char *strtab, 426 unsigned int symindex, 427 unsigned int relsec, 428 struct module *me) 429 { 430 Elf32_Rel *rel = (void *) sechdrs[relsec].sh_addr; 431 Elf32_Sym *sym; 432 uint32_t *location; 433 unsigned int i; 434 Elf32_Addr v; 435 int res; 436 437 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 438 Elf32_Word r_info = rel[i].r_info; 439 440 /* This is where to make the change */ 441 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 442 + rel[i].r_offset; 443 /* This is the symbol it is referring to */ 444 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 445 + ELF32_R_SYM(r_info); 446 447 if (!sym->st_value) { 448 pr_debug("%s: undefined weak symbol %s\n", 449 me->name, strtab + sym->st_name); 450 /* just print the warning, dont barf */ 451 } 452 453 v = sym->st_value; 454 455 res = reloc_handlers[ELF32_R_TYPE(r_info)](me, location, v); 456 if (res) { 457 char *r = rstrs[ELF32_R_TYPE(r_info)]; 458 pr_warn("VPE loader: .text+0x%x relocation type %s for symbol \"%s\" failed\n", 459 rel[i].r_offset, r ? r : "UNKNOWN", 460 strtab + sym->st_name); 461 return res; 462 } 463 } 464 465 return 0; 466 } 467 468 static inline void save_gp_address(unsigned int secbase, unsigned int rel) 469 { 470 gp_addr = secbase + rel; 471 gp_offs = gp_addr - (secbase & 0xffff0000); 472 } 473 /* end module-elf32.c */ 474 475 /* Change all symbols so that sh_value encodes the pointer directly. */ 476 static void simplify_symbols(Elf_Shdr *sechdrs, 477 unsigned int symindex, 478 const char *strtab, 479 const char *secstrings, 480 unsigned int nsecs, struct module *mod) 481 { 482 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 483 unsigned long secbase, bssbase = 0; 484 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 485 int size; 486 487 /* find the .bss section for COMMON symbols */ 488 for (i = 0; i < nsecs; i++) { 489 if (strncmp(secstrings + sechdrs[i].sh_name, ".bss", 4) == 0) { 490 bssbase = sechdrs[i].sh_addr; 491 break; 492 } 493 } 494 495 for (i = 1; i < n; i++) { 496 switch (sym[i].st_shndx) { 497 case SHN_COMMON: 498 /* Allocate space for the symbol in the .bss section. 499 st_value is currently size. 500 We want it to have the address of the symbol. */ 501 502 size = sym[i].st_value; 503 sym[i].st_value = bssbase; 504 505 bssbase += size; 506 break; 507 508 case SHN_ABS: 509 /* Don't need to do anything */ 510 break; 511 512 case SHN_UNDEF: 513 /* ret = -ENOENT; */ 514 break; 515 516 case SHN_MIPS_SCOMMON: 517 pr_debug("simplify_symbols: ignoring SHN_MIPS_SCOMMON symbol <%s> st_shndx %d\n", 518 strtab + sym[i].st_name, sym[i].st_shndx); 519 /* .sbss section */ 520 break; 521 522 default: 523 secbase = sechdrs[sym[i].st_shndx].sh_addr; 524 525 if (strncmp(strtab + sym[i].st_name, "_gp", 3) == 0) 526 save_gp_address(secbase, sym[i].st_value); 527 528 sym[i].st_value += secbase; 529 break; 530 } 531 } 532 } 533 534 #ifdef DEBUG_ELFLOADER 535 static void dump_elfsymbols(Elf_Shdr *sechdrs, unsigned int symindex, 536 const char *strtab, struct module *mod) 537 { 538 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 539 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 540 541 pr_debug("dump_elfsymbols: n %d\n", n); 542 for (i = 1; i < n; i++) { 543 pr_debug(" i %d name <%s> 0x%x\n", i, strtab + sym[i].st_name, 544 sym[i].st_value); 545 } 546 } 547 #endif 548 549 static int find_vpe_symbols(struct vpe *v, Elf_Shdr *sechdrs, 550 unsigned int symindex, const char *strtab, 551 struct module *mod) 552 { 553 Elf_Sym *sym = (void *)sechdrs[symindex].sh_addr; 554 unsigned int i, n = sechdrs[symindex].sh_size / sizeof(Elf_Sym); 555 556 for (i = 1; i < n; i++) { 557 if (strcmp(strtab + sym[i].st_name, "__start") == 0) 558 v->__start = sym[i].st_value; 559 560 if (strcmp(strtab + sym[i].st_name, "vpe_shared") == 0) 561 v->shared_ptr = (void *)sym[i].st_value; 562 } 563 564 if ((v->__start == 0) || (v->shared_ptr == NULL)) 565 return -1; 566 567 return 0; 568 } 569 570 /* 571 * Allocates a VPE with some program code space(the load address), copies the 572 * contents of the program (p)buffer performing relocatations/etc, free's it 573 * when finished. 574 */ 575 static int vpe_elfload(struct vpe *v) 576 { 577 Elf_Ehdr *hdr; 578 Elf_Shdr *sechdrs; 579 long err = 0; 580 char *secstrings, *strtab = NULL; 581 unsigned int len, i, symindex = 0, strindex = 0, relocate = 0; 582 struct module mod; /* so we can re-use the relocations code */ 583 584 memset(&mod, 0, sizeof(struct module)); 585 strcpy(mod.name, "VPE loader"); 586 587 hdr = (Elf_Ehdr *) v->pbuffer; 588 len = v->plen; 589 590 /* Sanity checks against insmoding binaries or wrong arch, 591 weird elf version */ 592 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) != 0 593 || (hdr->e_type != ET_REL && hdr->e_type != ET_EXEC) 594 || !elf_check_arch(hdr) 595 || hdr->e_shentsize != sizeof(*sechdrs)) { 596 pr_warn("VPE loader: program wrong arch or weird elf version\n"); 597 598 return -ENOEXEC; 599 } 600 601 if (hdr->e_type == ET_REL) 602 relocate = 1; 603 604 if (len < hdr->e_shoff + hdr->e_shnum * sizeof(Elf_Shdr)) { 605 pr_err("VPE loader: program length %u truncated\n", len); 606 607 return -ENOEXEC; 608 } 609 610 /* Convenience variables */ 611 sechdrs = (void *)hdr + hdr->e_shoff; 612 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 613 sechdrs[0].sh_addr = 0; 614 615 /* And these should exist, but gcc whinges if we don't init them */ 616 symindex = strindex = 0; 617 618 if (relocate) { 619 for (i = 1; i < hdr->e_shnum; i++) { 620 if ((sechdrs[i].sh_type != SHT_NOBITS) && 621 (len < sechdrs[i].sh_offset + sechdrs[i].sh_size)) { 622 pr_err("VPE program length %u truncated\n", 623 len); 624 return -ENOEXEC; 625 } 626 627 /* Mark all sections sh_addr with their address in the 628 temporary image. */ 629 sechdrs[i].sh_addr = (size_t) hdr + 630 sechdrs[i].sh_offset; 631 632 /* Internal symbols and strings. */ 633 if (sechdrs[i].sh_type == SHT_SYMTAB) { 634 symindex = i; 635 strindex = sechdrs[i].sh_link; 636 strtab = (char *)hdr + 637 sechdrs[strindex].sh_offset; 638 } 639 } 640 layout_sections(&mod, hdr, sechdrs, secstrings); 641 } 642 643 v->load_addr = alloc_progmem(mod.mem[MOD_TEXT].size); 644 if (!v->load_addr) 645 return -ENOMEM; 646 647 pr_info("VPE loader: loading to %p\n", v->load_addr); 648 649 if (relocate) { 650 for (i = 0; i < hdr->e_shnum; i++) { 651 void *dest; 652 653 if (!(sechdrs[i].sh_flags & SHF_ALLOC)) 654 continue; 655 656 dest = v->load_addr + sechdrs[i].sh_entsize; 657 658 if (sechdrs[i].sh_type != SHT_NOBITS) 659 memcpy(dest, (void *)sechdrs[i].sh_addr, 660 sechdrs[i].sh_size); 661 /* Update sh_addr to point to copy in image. */ 662 sechdrs[i].sh_addr = (unsigned long)dest; 663 664 pr_debug(" section sh_name %s sh_addr 0x%x\n", 665 secstrings + sechdrs[i].sh_name, 666 sechdrs[i].sh_addr); 667 } 668 669 /* Fix up syms, so that st_value is a pointer to location. */ 670 simplify_symbols(sechdrs, symindex, strtab, secstrings, 671 hdr->e_shnum, &mod); 672 673 /* Now do relocations. */ 674 for (i = 1; i < hdr->e_shnum; i++) { 675 const char *strtab = (char *)sechdrs[strindex].sh_addr; 676 unsigned int info = sechdrs[i].sh_info; 677 678 /* Not a valid relocation section? */ 679 if (info >= hdr->e_shnum) 680 continue; 681 682 /* Don't bother with non-allocated sections */ 683 if (!(sechdrs[info].sh_flags & SHF_ALLOC)) 684 continue; 685 686 if (sechdrs[i].sh_type == SHT_REL) 687 err = apply_relocations(sechdrs, strtab, 688 symindex, i, &mod); 689 else if (sechdrs[i].sh_type == SHT_RELA) 690 err = apply_relocate_add(sechdrs, strtab, 691 symindex, i, &mod); 692 if (err < 0) 693 return err; 694 695 } 696 } else { 697 struct elf_phdr *phdr = (struct elf_phdr *) 698 ((char *)hdr + hdr->e_phoff); 699 700 for (i = 0; i < hdr->e_phnum; i++) { 701 if (phdr->p_type == PT_LOAD) { 702 memcpy((void *)phdr->p_paddr, 703 (char *)hdr + phdr->p_offset, 704 phdr->p_filesz); 705 memset((void *)phdr->p_paddr + phdr->p_filesz, 706 0, phdr->p_memsz - phdr->p_filesz); 707 } 708 phdr++; 709 } 710 711 for (i = 0; i < hdr->e_shnum; i++) { 712 /* Internal symbols and strings. */ 713 if (sechdrs[i].sh_type == SHT_SYMTAB) { 714 symindex = i; 715 strindex = sechdrs[i].sh_link; 716 strtab = (char *)hdr + 717 sechdrs[strindex].sh_offset; 718 719 /* 720 * mark symtab's address for when we try 721 * to find the magic symbols 722 */ 723 sechdrs[i].sh_addr = (size_t) hdr + 724 sechdrs[i].sh_offset; 725 } 726 } 727 } 728 729 /* make sure it's physically written out */ 730 flush_icache_range((unsigned long)v->load_addr, 731 (unsigned long)v->load_addr + v->len); 732 733 if ((find_vpe_symbols(v, sechdrs, symindex, strtab, &mod)) < 0) { 734 if (v->__start == 0) { 735 pr_warn("VPE loader: program does not contain a __start symbol\n"); 736 return -ENOEXEC; 737 } 738 739 if (v->shared_ptr == NULL) 740 pr_warn("VPE loader: program does not contain vpe_shared symbol.\n" 741 " Unable to use AMVP (AP/SP) facilities.\n"); 742 } 743 744 pr_info(" elf loaded\n"); 745 return 0; 746 } 747 748 /* checks VPE is unused and gets ready to load program */ 749 static int vpe_open(struct inode *inode, struct file *filp) 750 { 751 enum vpe_state state; 752 struct vpe_notifications *notifier; 753 struct vpe *v; 754 755 if (VPE_MODULE_MINOR != iminor(inode)) { 756 /* assume only 1 device at the moment. */ 757 pr_warn("VPE loader: only vpe1 is supported\n"); 758 759 return -ENODEV; 760 } 761 762 v = get_vpe(aprp_cpu_index()); 763 if (v == NULL) { 764 pr_warn("VPE loader: unable to get vpe\n"); 765 766 return -ENODEV; 767 } 768 769 state = xchg(&v->state, VPE_STATE_INUSE); 770 if (state != VPE_STATE_UNUSED) { 771 pr_debug("VPE loader: tc in use dumping regs\n"); 772 773 list_for_each_entry(notifier, &v->notify, list) 774 notifier->stop(aprp_cpu_index()); 775 776 release_progmem(v->load_addr); 777 cleanup_tc(get_tc(aprp_cpu_index())); 778 } 779 780 /* this of-course trashes what was there before... */ 781 v->pbuffer = vmalloc(P_SIZE); 782 if (!v->pbuffer) { 783 pr_warn("VPE loader: unable to allocate memory\n"); 784 return -ENOMEM; 785 } 786 v->plen = P_SIZE; 787 v->load_addr = NULL; 788 v->len = 0; 789 v->shared_ptr = NULL; 790 v->__start = 0; 791 792 return 0; 793 } 794 795 static int vpe_release(struct inode *inode, struct file *filp) 796 { 797 #ifdef CONFIG_MIPS_VPE_LOADER_MT 798 struct vpe *v; 799 Elf_Ehdr *hdr; 800 int ret = 0; 801 802 v = get_vpe(aprp_cpu_index()); 803 if (v == NULL) 804 return -ENODEV; 805 806 hdr = (Elf_Ehdr *) v->pbuffer; 807 if (memcmp(hdr->e_ident, ELFMAG, SELFMAG) == 0) { 808 if (vpe_elfload(v) >= 0) { 809 vpe_run(v); 810 } else { 811 pr_warn("VPE loader: ELF load failed.\n"); 812 ret = -ENOEXEC; 813 } 814 } else { 815 pr_warn("VPE loader: only elf files are supported\n"); 816 ret = -ENOEXEC; 817 } 818 819 /* It's good to be able to run the SP and if it chokes have a look at 820 the /dev/rt?. But if we reset the pointer to the shared struct we 821 lose what has happened. So perhaps if garbage is sent to the vpe 822 device, use it as a trigger for the reset. Hopefully a nice 823 executable will be along shortly. */ 824 if (ret < 0) 825 v->shared_ptr = NULL; 826 827 vfree(v->pbuffer); 828 v->plen = 0; 829 830 return ret; 831 #else 832 pr_warn("VPE loader: ELF load failed.\n"); 833 return -ENOEXEC; 834 #endif 835 } 836 837 static ssize_t vpe_write(struct file *file, const char __user *buffer, 838 size_t count, loff_t *ppos) 839 { 840 size_t ret = count; 841 struct vpe *v; 842 843 if (iminor(file_inode(file)) != VPE_MODULE_MINOR) 844 return -ENODEV; 845 846 v = get_vpe(aprp_cpu_index()); 847 848 if (v == NULL) 849 return -ENODEV; 850 851 if ((count + v->len) > v->plen) { 852 pr_warn("VPE loader: elf size too big. Perhaps strip unneeded symbols\n"); 853 return -ENOMEM; 854 } 855 856 count -= copy_from_user(v->pbuffer + v->len, buffer, count); 857 if (!count) 858 return -EFAULT; 859 860 v->len += count; 861 return ret; 862 } 863 864 const struct file_operations vpe_fops = { 865 .owner = THIS_MODULE, 866 .open = vpe_open, 867 .release = vpe_release, 868 .write = vpe_write, 869 .llseek = noop_llseek, 870 }; 871 872 void *vpe_get_shared(int index) 873 { 874 struct vpe *v = get_vpe(index); 875 876 if (v == NULL) 877 return NULL; 878 879 return v->shared_ptr; 880 } 881 EXPORT_SYMBOL(vpe_get_shared); 882 883 int vpe_notify(int index, struct vpe_notifications *notify) 884 { 885 struct vpe *v = get_vpe(index); 886 887 if (v == NULL) 888 return -1; 889 890 list_add(¬ify->list, &v->notify); 891 return 0; 892 } 893 EXPORT_SYMBOL(vpe_notify); 894 895 module_init(vpe_module_init); 896 module_exit(vpe_module_exit); 897 MODULE_DESCRIPTION("MIPS VPE Loader"); 898 MODULE_AUTHOR("Elizabeth Oldham, MIPS Technologies, Inc."); 899 MODULE_LICENSE("GPL"); 900