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