| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * fs/proc/vmcore.c Interface for accessing the crash |
| 38 | * dump from the system's previous life. |
| 39 | * Heavily borrowed from fs/proc/kcore.c |
| 40 | * Created by: Hariprasad Nellitheertha (hari@in.ibm.com) |
| 41 | * Copyright (C) IBM Corporation, 2004. All rights reserved |
| 42 | * |
| 43 | */ |
| 44 | |
| 45 | #include <linux/version.h> |
| 46 | #include <linux/mm.h> |
| 47 | #include <linux/proc_fs.h> |
| 48 | #include <linux/user.h> |
| 49 | #include <linux/elf.h> |
| 50 | #include <linux/elfcore.h> |
| 51 | #include <linux/slab.h> |
| 52 | #include <linux/highmem.h> |
| 53 | #include <linux/bootmem.h> |
| 54 | #include <linux/init.h> |
| 55 | #include <linux/crash_dump.h> |
| 56 | #include <linux/list.h> |
| 57 | #include <asm/uaccess.h> |
| 58 | #include <asm/io.h> |
| 59 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) |
| 60 | #include <linux/kcore.h> |
| 61 | #endif |
| 62 | #include "mic_common.h" |
| 63 | |
| 64 | extern struct proc_dir_entry *vmcore_dir; |
| 65 | |
| 66 | /* Stores the physical address of elf header of crash image. */ |
| 67 | unsigned long long elfcorehdr_addr = 0x50e9000; |
| 68 | |
| 69 | /** |
| 70 | * mic_copy_oldmem_page - copy one page from "oldmem" |
| 71 | * @pfn: page frame number to be copied |
| 72 | * @buf: target memory address for the copy; this can be in kernel address |
| 73 | * space or user address space (see @userbuf) |
| 74 | * @csize: number of bytes to copy |
| 75 | * @offset: offset in bytes into the page (based on pfn) to begin the copy |
| 76 | * @userbuf: if set, @buf is in user address space, use copy_to_user(), |
| 77 | * otherwise @buf is in kernel address space, use memcpy(). |
| 78 | * |
| 79 | * Copy a page from "oldmem". For this page, there is no pte mapped |
| 80 | * in the current kernel. We stitch up a pte, similar to kmap_atomic. |
| 81 | */ |
| 82 | ssize_t mic_copy_oldmem_page(mic_ctx_t *mic_ctx, |
| 83 | unsigned long pfn, char *buf, |
| 84 | size_t csize, unsigned long offset, int userbuf) |
| 85 | { |
| 86 | void *vaddr, *tmp; |
| 87 | int err; |
| 88 | struct dma_channel *dma_chan; |
| 89 | dma_addr_t mic_dst_phys_addr; |
| 90 | |
| 91 | vaddr = mic_ctx->aper.va + (pfn << PAGE_SHIFT); |
| 92 | |
| 93 | if (!csize) |
| 94 | return 0; |
| 95 | if (csize == PAGE_SIZE && !offset) { |
| 96 | if (!(tmp = (void*)__get_free_pages(GFP_KERNEL, get_order(PAGE_SIZE)))) { |
| 97 | printk(KERN_ERR "%s: tmp buffer allocation failed\n", __func__); |
| 98 | return -ENOMEM; |
| 99 | } |
| 100 | mic_dst_phys_addr = mic_ctx_map_single(mic_ctx, tmp, csize); |
| 101 | if (mic_map_error(mic_dst_phys_addr)) { |
| 102 | printk(KERN_ERR "%s: mic_ctx_map_single failed\n", __func__); |
| 103 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 104 | return -ENOMEM; |
| 105 | } |
| 106 | |
| 107 | if ((allocate_dma_channel(mic_ctx->dma_handle, &dma_chan))) { |
| 108 | printk(KERN_ERR "%s: allocate_dma_channel failed\n", __func__); |
| 109 | mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize); |
| 110 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 111 | return -EBUSY; |
| 112 | } |
| 113 | |
| 114 | err = do_dma(dma_chan, |
| 115 | 0, |
| 116 | pfn << PAGE_SHIFT, |
| 117 | mic_dst_phys_addr, |
| 118 | csize, |
| 119 | NULL); |
| 120 | if (err) { |
| 121 | printk(KERN_ERR "DMA do_dma err %s %d err %d src 0x%lx " |
| 122 | "dst 0x%llx csize 0x%lx\n", |
| 123 | __func__, __LINE__, err, pfn << PAGE_SHIFT, |
| 124 | mic_dst_phys_addr, csize); |
| 125 | free_dma_channel(dma_chan); |
| 126 | mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize); |
| 127 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 128 | return err; |
| 129 | } |
| 130 | free_dma_channel(dma_chan); |
| 131 | err = drain_dma_poll(dma_chan); |
| 132 | if (err) { |
| 133 | printk(KERN_ERR "DMA poll err %s %d err %d src 0x%lx i" |
| 134 | "dst 0x%llx csize 0x%lx\n", |
| 135 | __func__, __LINE__, err, pfn << PAGE_SHIFT, |
| 136 | mic_dst_phys_addr, csize); |
| 137 | mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize); |
| 138 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 139 | return err; |
| 140 | } |
| 141 | if (userbuf) { |
| 142 | if (copy_to_user(buf, tmp, csize)) { |
| 143 | mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize); |
| 144 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 145 | return -EFAULT; |
| 146 | } |
| 147 | } else { |
| 148 | memcpy(buf, tmp, csize); |
| 149 | } |
| 150 | smp_mb(); |
| 151 | mic_ctx_unmap_single(mic_ctx, mic_dst_phys_addr, csize); |
| 152 | free_pages((unsigned long)tmp, get_order(PAGE_SIZE)); |
| 153 | } else { |
| 154 | if (userbuf) { |
| 155 | if (copy_to_user(buf, vaddr + offset, csize)) |
| 156 | return -EFAULT; |
| 157 | } else |
| 158 | memcpy_fromio(buf, vaddr + offset, csize); |
| 159 | } |
| 160 | return csize; |
| 161 | } |
| 162 | |
| 163 | /* Reads a page from the oldmem device from given offset. */ |
| 164 | static ssize_t read_from_oldmem(mic_ctx_t *mic_ctx, |
| 165 | char *buf, size_t count, |
| 166 | u64 *ppos, int userbuf) |
| 167 | { |
| 168 | unsigned long pfn, offset; |
| 169 | size_t nr_bytes; |
| 170 | ssize_t read = 0, tmp; |
| 171 | |
| 172 | if (!count) |
| 173 | return 0; |
| 174 | |
| 175 | offset = (unsigned long)(*ppos % PAGE_SIZE); |
| 176 | pfn = (unsigned long)(*ppos / PAGE_SIZE); |
| 177 | |
| 178 | do { |
| 179 | if (count > (PAGE_SIZE - offset)) |
| 180 | nr_bytes = PAGE_SIZE - offset; |
| 181 | else |
| 182 | nr_bytes = count; |
| 183 | |
| 184 | tmp = mic_copy_oldmem_page(mic_ctx, pfn, buf, nr_bytes, offset, userbuf); |
| 185 | if (tmp < 0) |
| 186 | return tmp; |
| 187 | *ppos += nr_bytes; |
| 188 | count -= nr_bytes; |
| 189 | buf += nr_bytes; |
| 190 | read += nr_bytes; |
| 191 | ++pfn; |
| 192 | offset = 0; |
| 193 | } while (count); |
| 194 | |
| 195 | return read; |
| 196 | } |
| 197 | |
| 198 | /* Maps vmcore file offset to respective physical address in memroy. */ |
| 199 | static u64 map_offset_to_paddr(loff_t offset, struct list_head *vc_list, |
| 200 | struct vmcore **m_ptr) |
| 201 | { |
| 202 | struct vmcore *m; |
| 203 | u64 paddr; |
| 204 | |
| 205 | list_for_each_entry(m, vc_list, list) { |
| 206 | u64 start, end; |
| 207 | start = m->offset; |
| 208 | end = m->offset + m->size - 1; |
| 209 | if (offset >= start && offset <= end) { |
| 210 | paddr = m->paddr + offset - start; |
| 211 | *m_ptr = m; |
| 212 | return paddr; |
| 213 | } |
| 214 | } |
| 215 | *m_ptr = NULL; |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | /* Read from the ELF header and then the crash dump. On error, negative value is |
| 220 | * returned otherwise number of bytes read are returned. |
| 221 | */ |
| 222 | static ssize_t read_vmcore(struct file *file, char __user *buffer, |
| 223 | size_t buflen, loff_t *fpos) |
| 224 | { |
| 225 | ssize_t acc = 0, tmp; |
| 226 | size_t tsz; |
| 227 | u64 start, nr_bytes; |
| 228 | struct vmcore *curr_m = NULL; |
| 229 | struct inode *inode = file->f_path.dentry->d_inode; |
| 230 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) |
| 231 | mic_ctx_t *mic_ctx = PDE_DATA(inode); |
| 232 | #else |
| 233 | struct proc_dir_entry *entry = PDE(inode); |
| 234 | mic_ctx_t *mic_ctx = entry->data; |
| 235 | #endif |
| 236 | |
| 237 | if (buflen == 0 || *fpos >= mic_ctx->vmcore_size) |
| 238 | return 0; |
| 239 | |
| 240 | /* trim buflen to not go beyond EOF */ |
| 241 | if (buflen > mic_ctx->vmcore_size - *fpos) |
| 242 | buflen = mic_ctx->vmcore_size - *fpos; |
| 243 | |
| 244 | /* Read ELF core header */ |
| 245 | if (*fpos < mic_ctx->elfcorebuf_sz) { |
| 246 | tsz = mic_ctx->elfcorebuf_sz - *fpos; |
| 247 | if (buflen < tsz) |
| 248 | tsz = buflen; |
| 249 | if (copy_to_user(buffer, mic_ctx->elfcorebuf + *fpos, tsz)) |
| 250 | return -EFAULT; |
| 251 | buflen -= tsz; |
| 252 | *fpos += tsz; |
| 253 | buffer += tsz; |
| 254 | acc += tsz; |
| 255 | |
| 256 | /* leave now if filled buffer already */ |
| 257 | if (buflen == 0) |
| 258 | return acc; |
| 259 | } |
| 260 | |
| 261 | start = map_offset_to_paddr(*fpos, &mic_ctx->vmcore_list, &curr_m); |
| 262 | if (!curr_m) |
| 263 | return -EINVAL; |
| 264 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) |
| 265 | tsz = buflen; |
| 266 | |
| 267 | /* Calculate left bytes in current memory segment. */ |
| 268 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); |
| 269 | if (tsz > nr_bytes) |
| 270 | tsz = nr_bytes; |
| 271 | |
| 272 | while (buflen) { |
| 273 | tmp = read_from_oldmem(mic_ctx,buffer, tsz, &start, 1); |
| 274 | if (tmp < 0) |
| 275 | return tmp; |
| 276 | buflen -= tsz; |
| 277 | *fpos += tsz; |
| 278 | buffer += tsz; |
| 279 | acc += tsz; |
| 280 | if (start >= (curr_m->paddr + curr_m->size)) { |
| 281 | if (curr_m->list.next == &mic_ctx->vmcore_list) |
| 282 | return acc; /*EOF*/ |
| 283 | curr_m = list_entry(curr_m->list.next, |
| 284 | struct vmcore, list); |
| 285 | start = curr_m->paddr; |
| 286 | } |
| 287 | if ((tsz = (PAGE_SIZE - (start & ~PAGE_MASK))) > buflen) |
| 288 | tsz = buflen; |
| 289 | /* Calculate left bytes in current memory segment. */ |
| 290 | nr_bytes = (curr_m->size - (start - curr_m->paddr)); |
| 291 | if (tsz > nr_bytes) |
| 292 | tsz = nr_bytes; |
| 293 | } |
| 294 | return acc; |
| 295 | } |
| 296 | |
| 297 | static const struct file_operations proc_vmcore_operations = { |
| 298 | .read = read_vmcore, |
| 299 | }; |
| 300 | |
| 301 | static struct vmcore* get_new_element(void) |
| 302 | { |
| 303 | return kzalloc(sizeof(struct vmcore), GFP_KERNEL); |
| 304 | } |
| 305 | |
| 306 | static u64 get_vmcore_size_elf64(char *elfptr) |
| 307 | { |
| 308 | int i; |
| 309 | u64 size; |
| 310 | Elf64_Ehdr *ehdr_ptr; |
| 311 | Elf64_Phdr *phdr_ptr; |
| 312 | |
| 313 | ehdr_ptr = (Elf64_Ehdr *)elfptr; |
| 314 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); |
| 315 | size = sizeof(Elf64_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr)); |
| 316 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { |
| 317 | size += phdr_ptr->p_memsz; |
| 318 | phdr_ptr++; |
| 319 | } |
| 320 | return size; |
| 321 | } |
| 322 | |
| 323 | static u64 get_vmcore_size_elf32(char *elfptr) |
| 324 | { |
| 325 | int i; |
| 326 | u64 size; |
| 327 | Elf32_Ehdr *ehdr_ptr; |
| 328 | Elf32_Phdr *phdr_ptr; |
| 329 | |
| 330 | ehdr_ptr = (Elf32_Ehdr *)elfptr; |
| 331 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); |
| 332 | size = sizeof(Elf32_Ehdr) + ((ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr)); |
| 333 | for (i = 0; i < ehdr_ptr->e_phnum; i++) { |
| 334 | size += phdr_ptr->p_memsz; |
| 335 | phdr_ptr++; |
| 336 | } |
| 337 | return size; |
| 338 | } |
| 339 | |
| 340 | /* Merges all the PT_NOTE headers into one. */ |
| 341 | static int merge_note_headers_elf64(mic_ctx_t *mic_ctx, |
| 342 | char *elfptr, size_t *elfsz, |
| 343 | struct list_head *vc_list) |
| 344 | { |
| 345 | int i, nr_ptnote=0, rc=0; |
| 346 | char *tmp; |
| 347 | Elf64_Ehdr *ehdr_ptr; |
| 348 | Elf64_Phdr phdr, *phdr_ptr; |
| 349 | Elf64_Nhdr *nhdr_ptr; |
| 350 | u64 phdr_sz = 0, note_off; |
| 351 | |
| 352 | ehdr_ptr = (Elf64_Ehdr *)elfptr; |
| 353 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); |
| 354 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
| 355 | int j; |
| 356 | void *notes_section; |
| 357 | struct vmcore *new; |
| 358 | u64 offset, max_sz, sz, real_sz = 0; |
| 359 | if (phdr_ptr->p_type != PT_NOTE) |
| 360 | continue; |
| 361 | nr_ptnote++; |
| 362 | max_sz = phdr_ptr->p_memsz; |
| 363 | offset = phdr_ptr->p_offset; |
| 364 | notes_section = kmalloc(max_sz, GFP_KERNEL); |
| 365 | if (!notes_section) |
| 366 | return -ENOMEM; |
| 367 | rc = read_from_oldmem(mic_ctx, notes_section, max_sz, &offset, 0); |
| 368 | if (rc < 0) { |
| 369 | kfree(notes_section); |
| 370 | return rc; |
| 371 | } |
| 372 | nhdr_ptr = notes_section; |
| 373 | for (j = 0; j < max_sz; j += sz) { |
| 374 | if (nhdr_ptr->n_namesz == 0) |
| 375 | break; |
| 376 | sz = sizeof(Elf64_Nhdr) + |
| 377 | ((nhdr_ptr->n_namesz + 3) & ~3) + |
| 378 | ((nhdr_ptr->n_descsz + 3) & ~3); |
| 379 | real_sz += sz; |
| 380 | nhdr_ptr = (Elf64_Nhdr*)((char*)nhdr_ptr + sz); |
| 381 | } |
| 382 | |
| 383 | /* Add this contiguous chunk of notes section to vmcore list.*/ |
| 384 | new = get_new_element(); |
| 385 | if (!new) { |
| 386 | kfree(notes_section); |
| 387 | return -ENOMEM; |
| 388 | } |
| 389 | new->paddr = phdr_ptr->p_offset; |
| 390 | new->size = real_sz; |
| 391 | list_add_tail(&new->list, vc_list); |
| 392 | phdr_sz += real_sz; |
| 393 | kfree(notes_section); |
| 394 | } |
| 395 | |
| 396 | /* Prepare merged PT_NOTE program header. */ |
| 397 | phdr.p_type = PT_NOTE; |
| 398 | phdr.p_flags = 0; |
| 399 | note_off = sizeof(Elf64_Ehdr) + |
| 400 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf64_Phdr); |
| 401 | phdr.p_offset = note_off; |
| 402 | phdr.p_vaddr = phdr.p_paddr = 0; |
| 403 | phdr.p_filesz = phdr.p_memsz = phdr_sz; |
| 404 | phdr.p_align = 0; |
| 405 | |
| 406 | /* Add merged PT_NOTE program header*/ |
| 407 | tmp = elfptr + sizeof(Elf64_Ehdr); |
| 408 | memcpy(tmp, &phdr, sizeof(phdr)); |
| 409 | tmp += sizeof(phdr); |
| 410 | |
| 411 | /* Remove unwanted PT_NOTE program headers. */ |
| 412 | i = (nr_ptnote - 1) * sizeof(Elf64_Phdr); |
| 413 | *elfsz = *elfsz - i; |
| 414 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf64_Ehdr)-sizeof(Elf64_Phdr))); |
| 415 | |
| 416 | /* Modify e_phnum to reflect merged headers. */ |
| 417 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; |
| 418 | |
| 419 | return 0; |
| 420 | } |
| 421 | |
| 422 | /* Merges all the PT_NOTE headers into one. */ |
| 423 | static int merge_note_headers_elf32(mic_ctx_t *mic_ctx, |
| 424 | char *elfptr, size_t *elfsz, |
| 425 | struct list_head *vc_list) |
| 426 | { |
| 427 | int i, nr_ptnote=0, rc=0; |
| 428 | char *tmp; |
| 429 | Elf32_Ehdr *ehdr_ptr; |
| 430 | Elf32_Phdr phdr, *phdr_ptr; |
| 431 | Elf32_Nhdr *nhdr_ptr; |
| 432 | u64 phdr_sz = 0, note_off; |
| 433 | |
| 434 | ehdr_ptr = (Elf32_Ehdr *)elfptr; |
| 435 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); |
| 436 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
| 437 | int j; |
| 438 | void *notes_section; |
| 439 | struct vmcore *new; |
| 440 | u64 offset, max_sz, sz, real_sz = 0; |
| 441 | if (phdr_ptr->p_type != PT_NOTE) |
| 442 | continue; |
| 443 | nr_ptnote++; |
| 444 | max_sz = phdr_ptr->p_memsz; |
| 445 | offset = phdr_ptr->p_offset; |
| 446 | notes_section = kmalloc(max_sz, GFP_KERNEL); |
| 447 | if (!notes_section) |
| 448 | return -ENOMEM; |
| 449 | rc = read_from_oldmem(mic_ctx, notes_section, max_sz, &offset, 0); |
| 450 | if (rc < 0) { |
| 451 | kfree(notes_section); |
| 452 | return rc; |
| 453 | } |
| 454 | nhdr_ptr = notes_section; |
| 455 | for (j = 0; j < max_sz; j += sz) { |
| 456 | if (nhdr_ptr->n_namesz == 0) |
| 457 | break; |
| 458 | sz = sizeof(Elf32_Nhdr) + |
| 459 | ((nhdr_ptr->n_namesz + 3) & ~3) + |
| 460 | ((nhdr_ptr->n_descsz + 3) & ~3); |
| 461 | real_sz += sz; |
| 462 | nhdr_ptr = (Elf32_Nhdr*)((char*)nhdr_ptr + sz); |
| 463 | } |
| 464 | |
| 465 | /* Add this contiguous chunk of notes section to vmcore list.*/ |
| 466 | new = get_new_element(); |
| 467 | if (!new) { |
| 468 | kfree(notes_section); |
| 469 | return -ENOMEM; |
| 470 | } |
| 471 | new->paddr = phdr_ptr->p_offset; |
| 472 | new->size = real_sz; |
| 473 | list_add_tail(&new->list, vc_list); |
| 474 | phdr_sz += real_sz; |
| 475 | kfree(notes_section); |
| 476 | } |
| 477 | |
| 478 | /* Prepare merged PT_NOTE program header. */ |
| 479 | phdr.p_type = PT_NOTE; |
| 480 | phdr.p_flags = 0; |
| 481 | note_off = sizeof(Elf32_Ehdr) + |
| 482 | (ehdr_ptr->e_phnum - nr_ptnote +1) * sizeof(Elf32_Phdr); |
| 483 | phdr.p_offset = note_off; |
| 484 | phdr.p_vaddr = phdr.p_paddr = 0; |
| 485 | phdr.p_filesz = phdr.p_memsz = phdr_sz; |
| 486 | phdr.p_align = 0; |
| 487 | |
| 488 | /* Add merged PT_NOTE program header*/ |
| 489 | tmp = elfptr + sizeof(Elf32_Ehdr); |
| 490 | memcpy(tmp, &phdr, sizeof(phdr)); |
| 491 | tmp += sizeof(phdr); |
| 492 | |
| 493 | /* Remove unwanted PT_NOTE program headers. */ |
| 494 | i = (nr_ptnote - 1) * sizeof(Elf32_Phdr); |
| 495 | *elfsz = *elfsz - i; |
| 496 | memmove(tmp, tmp+i, ((*elfsz)-sizeof(Elf32_Ehdr)-sizeof(Elf32_Phdr))); |
| 497 | |
| 498 | /* Modify e_phnum to reflect merged headers. */ |
| 499 | ehdr_ptr->e_phnum = ehdr_ptr->e_phnum - nr_ptnote + 1; |
| 500 | |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | /* Add memory chunks represented by program headers to vmcore list. Also update |
| 505 | * the new offset fields of exported program headers. */ |
| 506 | static int process_ptload_program_headers_elf64(char *elfptr, |
| 507 | size_t elfsz, |
| 508 | struct list_head *vc_list) |
| 509 | { |
| 510 | int i; |
| 511 | Elf64_Ehdr *ehdr_ptr; |
| 512 | Elf64_Phdr *phdr_ptr; |
| 513 | loff_t vmcore_off; |
| 514 | struct vmcore *new; |
| 515 | |
| 516 | ehdr_ptr = (Elf64_Ehdr *)elfptr; |
| 517 | phdr_ptr = (Elf64_Phdr*)(elfptr + sizeof(Elf64_Ehdr)); /* PT_NOTE hdr */ |
| 518 | |
| 519 | /* First program header is PT_NOTE header. */ |
| 520 | vmcore_off = sizeof(Elf64_Ehdr) + |
| 521 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr) + |
| 522 | phdr_ptr->p_memsz; /* Note sections */ |
| 523 | |
| 524 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
| 525 | if (phdr_ptr->p_type != PT_LOAD) |
| 526 | continue; |
| 527 | |
| 528 | /* Add this contiguous chunk of memory to vmcore list.*/ |
| 529 | new = get_new_element(); |
| 530 | if (!new) |
| 531 | return -ENOMEM; |
| 532 | new->paddr = phdr_ptr->p_offset; |
| 533 | new->size = phdr_ptr->p_memsz; |
| 534 | list_add_tail(&new->list, vc_list); |
| 535 | |
| 536 | /* Update the program header offset. */ |
| 537 | phdr_ptr->p_offset = vmcore_off; |
| 538 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; |
| 539 | } |
| 540 | return 0; |
| 541 | } |
| 542 | |
| 543 | static int process_ptload_program_headers_elf32(char *elfptr, |
| 544 | size_t elfsz, |
| 545 | struct list_head *vc_list) |
| 546 | { |
| 547 | int i; |
| 548 | Elf32_Ehdr *ehdr_ptr; |
| 549 | Elf32_Phdr *phdr_ptr; |
| 550 | loff_t vmcore_off; |
| 551 | struct vmcore *new; |
| 552 | |
| 553 | ehdr_ptr = (Elf32_Ehdr *)elfptr; |
| 554 | phdr_ptr = (Elf32_Phdr*)(elfptr + sizeof(Elf32_Ehdr)); /* PT_NOTE hdr */ |
| 555 | |
| 556 | /* First program header is PT_NOTE header. */ |
| 557 | vmcore_off = sizeof(Elf32_Ehdr) + |
| 558 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr) + |
| 559 | phdr_ptr->p_memsz; /* Note sections */ |
| 560 | |
| 561 | for (i = 0; i < ehdr_ptr->e_phnum; i++, phdr_ptr++) { |
| 562 | if (phdr_ptr->p_type != PT_LOAD) |
| 563 | continue; |
| 564 | |
| 565 | /* Add this contiguous chunk of memory to vmcore list.*/ |
| 566 | new = get_new_element(); |
| 567 | if (!new) |
| 568 | return -ENOMEM; |
| 569 | new->paddr = phdr_ptr->p_offset; |
| 570 | new->size = phdr_ptr->p_memsz; |
| 571 | list_add_tail(&new->list, vc_list); |
| 572 | |
| 573 | /* Update the program header offset */ |
| 574 | phdr_ptr->p_offset = vmcore_off; |
| 575 | vmcore_off = vmcore_off + phdr_ptr->p_memsz; |
| 576 | } |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | /* Sets offset fields of vmcore elements. */ |
| 581 | static void set_vmcore_list_offsets_elf64(char *elfptr, |
| 582 | struct list_head *vc_list) |
| 583 | { |
| 584 | loff_t vmcore_off; |
| 585 | Elf64_Ehdr *ehdr_ptr; |
| 586 | struct vmcore *m; |
| 587 | |
| 588 | ehdr_ptr = (Elf64_Ehdr *)elfptr; |
| 589 | |
| 590 | /* Skip Elf header and program headers. */ |
| 591 | vmcore_off = sizeof(Elf64_Ehdr) + |
| 592 | (ehdr_ptr->e_phnum) * sizeof(Elf64_Phdr); |
| 593 | |
| 594 | list_for_each_entry(m, vc_list, list) { |
| 595 | m->offset = vmcore_off; |
| 596 | vmcore_off += m->size; |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | /* Sets offset fields of vmcore elements. */ |
| 601 | static void set_vmcore_list_offsets_elf32(char *elfptr, |
| 602 | struct list_head *vc_list) |
| 603 | { |
| 604 | loff_t vmcore_off; |
| 605 | Elf32_Ehdr *ehdr_ptr; |
| 606 | struct vmcore *m; |
| 607 | |
| 608 | ehdr_ptr = (Elf32_Ehdr *)elfptr; |
| 609 | |
| 610 | /* Skip Elf header and program headers. */ |
| 611 | vmcore_off = sizeof(Elf32_Ehdr) + |
| 612 | (ehdr_ptr->e_phnum) * sizeof(Elf32_Phdr); |
| 613 | |
| 614 | list_for_each_entry(m, vc_list, list) { |
| 615 | m->offset = vmcore_off; |
| 616 | vmcore_off += m->size; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | static int parse_crash_elf64_headers(mic_ctx_t *mic_ctx) |
| 621 | { |
| 622 | int rc=0; |
| 623 | Elf64_Ehdr ehdr; |
| 624 | u64 addr; |
| 625 | |
| 626 | addr = elfcorehdr_addr; |
| 627 | |
| 628 | /* Read Elf header */ |
| 629 | rc = read_from_oldmem(mic_ctx, (char*)&ehdr, sizeof(Elf64_Ehdr), &addr, 0); |
| 630 | if (rc < 0) |
| 631 | return rc; |
| 632 | |
| 633 | /* Do some basic Verification. */ |
| 634 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || |
| 635 | (ehdr.e_type != ET_CORE) || |
| 636 | #ifdef CONFIG_CRASH_DUMP |
| 637 | #if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,36)) |
| 638 | !vmcore_elf64_check_arch(&ehdr) || |
| 639 | #else |
| 640 | !vmcore_elf_check_arch(&ehdr) || |
| 641 | #endif |
| 642 | #else |
| 643 | !elf_check_arch(&ehdr) || |
| 644 | #endif |
| 645 | ehdr.e_ident[EI_CLASS] != ELFCLASS64 || |
| 646 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || |
| 647 | ehdr.e_version != EV_CURRENT || |
| 648 | ehdr.e_ehsize != sizeof(Elf64_Ehdr) || |
| 649 | ehdr.e_phentsize != sizeof(Elf64_Phdr) || |
| 650 | ehdr.e_phnum == 0) { |
| 651 | printk(KERN_WARNING "Warning: Core image elf header is not" |
| 652 | "sane\n"); |
| 653 | return -EINVAL; |
| 654 | } |
| 655 | |
| 656 | WARN_ON(mic_ctx->elfcorebuf); |
| 657 | /* Read in all elf headers. */ |
| 658 | mic_ctx->elfcorebuf_sz = sizeof(Elf64_Ehdr) + ehdr.e_phnum * sizeof(Elf64_Phdr); |
| 659 | mic_ctx->elfcorebuf = kmalloc(mic_ctx->elfcorebuf_sz, GFP_KERNEL); |
| 660 | if (!mic_ctx->elfcorebuf) |
| 661 | return -ENOMEM; |
| 662 | addr = elfcorehdr_addr; |
| 663 | rc = read_from_oldmem(mic_ctx, mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, &addr, 0); |
| 664 | if (rc < 0) { |
| 665 | kfree(mic_ctx->elfcorebuf); |
| 666 | mic_ctx->elfcorebuf = NULL; |
| 667 | return rc; |
| 668 | } |
| 669 | |
| 670 | /* Merge all PT_NOTE headers into one. */ |
| 671 | rc = merge_note_headers_elf64(mic_ctx, mic_ctx->elfcorebuf, &mic_ctx->elfcorebuf_sz, &mic_ctx->vmcore_list); |
| 672 | if (rc) { |
| 673 | kfree(mic_ctx->elfcorebuf); |
| 674 | mic_ctx->elfcorebuf = NULL; |
| 675 | return rc; |
| 676 | } |
| 677 | rc = process_ptload_program_headers_elf64(mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, |
| 678 | &mic_ctx->vmcore_list); |
| 679 | if (rc) { |
| 680 | kfree(mic_ctx->elfcorebuf); |
| 681 | mic_ctx->elfcorebuf = NULL; |
| 682 | return rc; |
| 683 | } |
| 684 | set_vmcore_list_offsets_elf64(mic_ctx->elfcorebuf, &mic_ctx->vmcore_list); |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static int parse_crash_elf32_headers(mic_ctx_t *mic_ctx) |
| 689 | { |
| 690 | int rc=0; |
| 691 | Elf32_Ehdr ehdr; |
| 692 | u64 addr; |
| 693 | |
| 694 | addr = elfcorehdr_addr; |
| 695 | |
| 696 | /* Read Elf header */ |
| 697 | rc = read_from_oldmem(mic_ctx, (char*)&ehdr, sizeof(Elf32_Ehdr), &addr, 0); |
| 698 | if (rc < 0) |
| 699 | return rc; |
| 700 | |
| 701 | /* Do some basic Verification. */ |
| 702 | if (memcmp(ehdr.e_ident, ELFMAG, SELFMAG) != 0 || |
| 703 | (ehdr.e_type != ET_CORE) || |
| 704 | !elf_check_arch(&ehdr) || |
| 705 | ehdr.e_ident[EI_CLASS] != ELFCLASS32|| |
| 706 | ehdr.e_ident[EI_VERSION] != EV_CURRENT || |
| 707 | ehdr.e_version != EV_CURRENT || |
| 708 | ehdr.e_ehsize != sizeof(Elf32_Ehdr) || |
| 709 | ehdr.e_phentsize != sizeof(Elf32_Phdr) || |
| 710 | ehdr.e_phnum == 0) { |
| 711 | printk(KERN_WARNING "Warning: Core image elf header is not" |
| 712 | "sane\n"); |
| 713 | return -EINVAL; |
| 714 | } |
| 715 | |
| 716 | WARN_ON(mic_ctx->elfcorebuf); |
| 717 | /* Read in all elf headers. */ |
| 718 | mic_ctx->elfcorebuf_sz = sizeof(Elf32_Ehdr) + ehdr.e_phnum * sizeof(Elf32_Phdr); |
| 719 | mic_ctx->elfcorebuf = kmalloc(mic_ctx->elfcorebuf_sz, GFP_KERNEL); |
| 720 | if (!mic_ctx->elfcorebuf) |
| 721 | return -ENOMEM; |
| 722 | addr = elfcorehdr_addr; |
| 723 | rc = read_from_oldmem(mic_ctx, mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, &addr, 0); |
| 724 | if (rc < 0) { |
| 725 | kfree(mic_ctx->elfcorebuf); |
| 726 | mic_ctx->elfcorebuf = NULL; |
| 727 | return rc; |
| 728 | } |
| 729 | |
| 730 | /* Merge all PT_NOTE headers into one. */ |
| 731 | rc = merge_note_headers_elf32(mic_ctx, mic_ctx->elfcorebuf, &mic_ctx->elfcorebuf_sz, &mic_ctx->vmcore_list); |
| 732 | if (rc) { |
| 733 | kfree(mic_ctx->elfcorebuf); |
| 734 | mic_ctx->elfcorebuf = NULL; |
| 735 | return rc; |
| 736 | } |
| 737 | rc = process_ptload_program_headers_elf32(mic_ctx->elfcorebuf, mic_ctx->elfcorebuf_sz, |
| 738 | &mic_ctx->vmcore_list); |
| 739 | if (rc) { |
| 740 | kfree(mic_ctx->elfcorebuf); |
| 741 | mic_ctx->elfcorebuf = NULL; |
| 742 | return rc; |
| 743 | } |
| 744 | set_vmcore_list_offsets_elf32(mic_ctx->elfcorebuf, &mic_ctx->vmcore_list); |
| 745 | return 0; |
| 746 | } |
| 747 | |
| 748 | static int parse_crash_elf_headers(mic_ctx_t *mic_ctx) |
| 749 | { |
| 750 | unsigned char e_ident[EI_NIDENT]; |
| 751 | u64 addr; |
| 752 | int rc=0; |
| 753 | |
| 754 | addr = elfcorehdr_addr; |
| 755 | rc = read_from_oldmem(mic_ctx, e_ident, EI_NIDENT, &addr, 0); |
| 756 | if (rc < 0) |
| 757 | return rc; |
| 758 | if (memcmp(e_ident, ELFMAG, SELFMAG) != 0) { |
| 759 | printk(KERN_WARNING "Warning: Core image elf header" |
| 760 | " not found\n"); |
| 761 | return -EINVAL; |
| 762 | } |
| 763 | |
| 764 | if (e_ident[EI_CLASS] == ELFCLASS64) { |
| 765 | rc = parse_crash_elf64_headers(mic_ctx); |
| 766 | if (rc) |
| 767 | return rc; |
| 768 | |
| 769 | /* Determine vmcore size. */ |
| 770 | mic_ctx->vmcore_size = get_vmcore_size_elf64(mic_ctx->elfcorebuf); |
| 771 | } else if (e_ident[EI_CLASS] == ELFCLASS32) { |
| 772 | rc = parse_crash_elf32_headers(mic_ctx); |
| 773 | if (rc) |
| 774 | return rc; |
| 775 | |
| 776 | /* Determine vmcore size. */ |
| 777 | mic_ctx->vmcore_size = get_vmcore_size_elf32(mic_ctx->elfcorebuf); |
| 778 | } else { |
| 779 | printk(KERN_WARNING "Warning: Core image elf header is not" |
| 780 | " sane\n"); |
| 781 | return -EINVAL; |
| 782 | } |
| 783 | return 0; |
| 784 | } |
| 785 | |
| 786 | /* Init function for vmcore module. */ |
| 787 | int vmcore_create(mic_ctx_t *mic_ctx) |
| 788 | { |
| 789 | int rc = 0; |
| 790 | char name[64]; |
| 791 | if (!vmcore_dir) { |
| 792 | rc = -ENOMEM; |
| 793 | return rc; |
| 794 | } |
| 795 | INIT_LIST_HEAD(&mic_ctx->vmcore_list); |
| 796 | rc = parse_crash_elf_headers(mic_ctx); |
| 797 | if (rc) { |
| 798 | printk(KERN_WARNING "Kdump: vmcore not initialized\n"); |
| 799 | if (mic_ctx->vmcore_dir) { |
| 800 | remove_proc_entry(name, vmcore_dir); |
| 801 | mic_ctx->vmcore_dir = NULL; |
| 802 | } |
| 803 | return rc; |
| 804 | } |
| 805 | snprintf(name, 64, "mic%d", mic_ctx->bi_id); |
| 806 | if (!mic_ctx->vmcore_dir) { |
| 807 | mic_ctx->vmcore_dir = proc_create_data(name, S_IRUSR, |
| 808 | vmcore_dir, &proc_vmcore_operations, mic_ctx); |
| 809 | if (!mic_ctx->vmcore_dir) { |
| 810 | printk(KERN_WARNING "Kdump: proc creation for %s failed\n", name); |
| 811 | rc = -ENOMEM; |
| 812 | return rc; |
| 813 | } |
| 814 | } |
| 815 | #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0)) |
| 816 | #else |
| 817 | if (mic_ctx->vmcore_dir) |
| 818 | mic_ctx->vmcore_dir->size = mic_ctx->vmcore_size; |
| 819 | #endif |
| 820 | return 0; |
| 821 | } |