~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/s390/kernel/crash_dump.c

Version: ~ [ linux-5.3 ] ~ [ linux-5.2.15 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.73 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.144 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.193 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.193 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.73 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * S390 kdump implementation
  3  *
  4  * Copyright IBM Corp. 2011
  5  * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
  6  */
  7 
  8 #include <linux/crash_dump.h>
  9 #include <asm/lowcore.h>
 10 #include <linux/kernel.h>
 11 #include <linux/module.h>
 12 #include <linux/gfp.h>
 13 #include <linux/slab.h>
 14 #include <linux/bootmem.h>
 15 #include <linux/elf.h>
 16 #include <asm/asm-offsets.h>
 17 #include <linux/memblock.h>
 18 #include <asm/os_info.h>
 19 #include <asm/elf.h>
 20 #include <asm/ipl.h>
 21 #include <asm/sclp.h>
 22 
 23 #define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
 24 #define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
 25 #define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
 26 
 27 static struct memblock_region oldmem_region;
 28 
 29 static struct memblock_type oldmem_type = {
 30         .cnt = 1,
 31         .max = 1,
 32         .total_size = 0,
 33         .regions = &oldmem_region,
 34 };
 35 
 36 struct save_area {
 37         struct list_head list;
 38         u64 psw[2];
 39         u64 ctrs[16];
 40         u64 gprs[16];
 41         u32 acrs[16];
 42         u64 fprs[16];
 43         u32 fpc;
 44         u32 prefix;
 45         u64 todpreg;
 46         u64 timer;
 47         u64 todcmp;
 48         u64 vxrs_low[16];
 49         __vector128 vxrs_high[16];
 50 };
 51 
 52 static LIST_HEAD(dump_save_areas);
 53 
 54 /*
 55  * Allocate a save area
 56  */
 57 struct save_area * __init save_area_alloc(bool is_boot_cpu)
 58 {
 59         struct save_area *sa;
 60 
 61         sa = (void *) memblock_alloc(sizeof(*sa), 8);
 62         if (is_boot_cpu)
 63                 list_add(&sa->list, &dump_save_areas);
 64         else
 65                 list_add_tail(&sa->list, &dump_save_areas);
 66         return sa;
 67 }
 68 
 69 /*
 70  * Return the address of the save area for the boot CPU
 71  */
 72 struct save_area * __init save_area_boot_cpu(void)
 73 {
 74         if (list_empty(&dump_save_areas))
 75                 return NULL;
 76         return list_first_entry(&dump_save_areas, struct save_area, list);
 77 }
 78 
 79 /*
 80  * Copy CPU registers into the save area
 81  */
 82 void __init save_area_add_regs(struct save_area *sa, void *regs)
 83 {
 84         struct lowcore *lc;
 85 
 86         lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
 87         memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
 88         memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
 89         memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
 90         memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
 91         memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
 92         memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
 93         memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
 94         memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
 95         memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
 96         memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
 97 }
 98 
 99 /*
100  * Copy vector registers into the save area
101  */
102 void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
103 {
104         int i;
105 
106         /* Copy lower halves of vector registers 0-15 */
107         for (i = 0; i < 16; i++)
108                 memcpy(&sa->vxrs_low[i], &vxrs[i].u[2], 8);
109         /* Copy vector registers 16-31 */
110         memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
111 }
112 
113 /*
114  * Return physical address for virtual address
115  */
116 static inline void *load_real_addr(void *addr)
117 {
118         unsigned long real_addr;
119 
120         asm volatile(
121                    "    lra     %0,0(%1)\n"
122                    "    jz      0f\n"
123                    "    la      %0,0\n"
124                    "0:"
125                    : "=a" (real_addr) : "a" (addr) : "cc");
126         return (void *)real_addr;
127 }
128 
129 /*
130  * Copy memory of the old, dumped system to a kernel space virtual address
131  */
132 int copy_oldmem_kernel(void *dst, void *src, size_t count)
133 {
134         unsigned long from, len;
135         void *ra;
136         int rc;
137 
138         while (count) {
139                 from = __pa(src);
140                 if (!OLDMEM_BASE && from < sclp.hsa_size) {
141                         /* Copy from zfcpdump HSA area */
142                         len = min(count, sclp.hsa_size - from);
143                         rc = memcpy_hsa_kernel(dst, from, len);
144                         if (rc)
145                                 return rc;
146                 } else {
147                         /* Check for swapped kdump oldmem areas */
148                         if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
149                                 from -= OLDMEM_BASE;
150                                 len = min(count, OLDMEM_SIZE - from);
151                         } else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
152                                 len = min(count, OLDMEM_SIZE - from);
153                                 from += OLDMEM_BASE;
154                         } else {
155                                 len = count;
156                         }
157                         if (is_vmalloc_or_module_addr(dst)) {
158                                 ra = load_real_addr(dst);
159                                 len = min(PAGE_SIZE - offset_in_page(ra), len);
160                         } else {
161                                 ra = dst;
162                         }
163                         if (memcpy_real(ra, (void *) from, len))
164                                 return -EFAULT;
165                 }
166                 dst += len;
167                 src += len;
168                 count -= len;
169         }
170         return 0;
171 }
172 
173 /*
174  * Copy memory of the old, dumped system to a user space virtual address
175  */
176 static int copy_oldmem_user(void __user *dst, void *src, size_t count)
177 {
178         unsigned long from, len;
179         int rc;
180 
181         while (count) {
182                 from = __pa(src);
183                 if (!OLDMEM_BASE && from < sclp.hsa_size) {
184                         /* Copy from zfcpdump HSA area */
185                         len = min(count, sclp.hsa_size - from);
186                         rc = memcpy_hsa_user(dst, from, len);
187                         if (rc)
188                                 return rc;
189                 } else {
190                         /* Check for swapped kdump oldmem areas */
191                         if (OLDMEM_BASE && from - OLDMEM_BASE < OLDMEM_SIZE) {
192                                 from -= OLDMEM_BASE;
193                                 len = min(count, OLDMEM_SIZE - from);
194                         } else if (OLDMEM_BASE && from < OLDMEM_SIZE) {
195                                 len = min(count, OLDMEM_SIZE - from);
196                                 from += OLDMEM_BASE;
197                         } else {
198                                 len = count;
199                         }
200                         rc = copy_to_user_real(dst, (void *) from, count);
201                         if (rc)
202                                 return rc;
203                 }
204                 dst += len;
205                 src += len;
206                 count -= len;
207         }
208         return 0;
209 }
210 
211 /*
212  * Copy one page from "oldmem"
213  */
214 ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize,
215                          unsigned long offset, int userbuf)
216 {
217         void *src;
218         int rc;
219 
220         if (!csize)
221                 return 0;
222         src = (void *) (pfn << PAGE_SHIFT) + offset;
223         if (userbuf)
224                 rc = copy_oldmem_user((void __force __user *) buf, src, csize);
225         else
226                 rc = copy_oldmem_kernel((void *) buf, src, csize);
227         return rc;
228 }
229 
230 /*
231  * Remap "oldmem" for kdump
232  *
233  * For the kdump reserved memory this functions performs a swap operation:
234  * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
235  */
236 static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
237                                         unsigned long from, unsigned long pfn,
238                                         unsigned long size, pgprot_t prot)
239 {
240         unsigned long size_old;
241         int rc;
242 
243         if (pfn < OLDMEM_SIZE >> PAGE_SHIFT) {
244                 size_old = min(size, OLDMEM_SIZE - (pfn << PAGE_SHIFT));
245                 rc = remap_pfn_range(vma, from,
246                                      pfn + (OLDMEM_BASE >> PAGE_SHIFT),
247                                      size_old, prot);
248                 if (rc || size == size_old)
249                         return rc;
250                 size -= size_old;
251                 from += size_old;
252                 pfn += size_old >> PAGE_SHIFT;
253         }
254         return remap_pfn_range(vma, from, pfn, size, prot);
255 }
256 
257 /*
258  * Remap "oldmem" for zfcpdump
259  *
260  * We only map available memory above HSA size. Memory below HSA size
261  * is read on demand using the copy_oldmem_page() function.
262  */
263 static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
264                                            unsigned long from,
265                                            unsigned long pfn,
266                                            unsigned long size, pgprot_t prot)
267 {
268         unsigned long hsa_end = sclp.hsa_size;
269         unsigned long size_hsa;
270 
271         if (pfn < hsa_end >> PAGE_SHIFT) {
272                 size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT));
273                 if (size == size_hsa)
274                         return 0;
275                 size -= size_hsa;
276                 from += size_hsa;
277                 pfn += size_hsa >> PAGE_SHIFT;
278         }
279         return remap_pfn_range(vma, from, pfn, size, prot);
280 }
281 
282 /*
283  * Remap "oldmem" for kdump or zfcpdump
284  */
285 int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
286                            unsigned long pfn, unsigned long size, pgprot_t prot)
287 {
288         if (OLDMEM_BASE)
289                 return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
290         else
291                 return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
292                                                        prot);
293 }
294 
295 /*
296  * Alloc memory and panic in case of ENOMEM
297  */
298 static void *kzalloc_panic(int len)
299 {
300         void *rc;
301 
302         rc = kzalloc(len, GFP_KERNEL);
303         if (!rc)
304                 panic("s390 kdump kzalloc (%d) failed", len);
305         return rc;
306 }
307 
308 /*
309  * Initialize ELF note
310  */
311 static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len,
312                           const char *name)
313 {
314         Elf64_Nhdr *note;
315         u64 len;
316 
317         note = (Elf64_Nhdr *)buf;
318         note->n_namesz = strlen(name) + 1;
319         note->n_descsz = d_len;
320         note->n_type = type;
321         len = sizeof(Elf64_Nhdr);
322 
323         memcpy(buf + len, name, note->n_namesz);
324         len = roundup(len + note->n_namesz, 4);
325 
326         memcpy(buf + len, desc, note->n_descsz);
327         len = roundup(len + note->n_descsz, 4);
328 
329         return PTR_ADD(buf, len);
330 }
331 
332 static inline void *nt_init(void *buf, Elf64_Word type, void *desc, int d_len)
333 {
334         return nt_init_name(buf, type, desc, d_len, KEXEC_CORE_NOTE_NAME);
335 }
336 
337 /*
338  * Fill ELF notes for one CPU with save area registers
339  */
340 static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa)
341 {
342         struct elf_prstatus nt_prstatus;
343         elf_fpregset_t nt_fpregset;
344 
345         /* Prepare prstatus note */
346         memset(&nt_prstatus, 0, sizeof(nt_prstatus));
347         memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
348         memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
349         memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs));
350         nt_prstatus.pr_pid = cpu;
351         /* Prepare fpregset (floating point) note */
352         memset(&nt_fpregset, 0, sizeof(nt_fpregset));
353         memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
354         memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
355         /* Create ELF notes for the CPU */
356         ptr = nt_init(ptr, NT_PRSTATUS, &nt_prstatus, sizeof(nt_prstatus));
357         ptr = nt_init(ptr, NT_PRFPREG, &nt_fpregset, sizeof(nt_fpregset));
358         ptr = nt_init(ptr, NT_S390_TIMER, &sa->timer, sizeof(sa->timer));
359         ptr = nt_init(ptr, NT_S390_TODCMP, &sa->todcmp, sizeof(sa->todcmp));
360         ptr = nt_init(ptr, NT_S390_TODPREG, &sa->todpreg, sizeof(sa->todpreg));
361         ptr = nt_init(ptr, NT_S390_CTRS, &sa->ctrs, sizeof(sa->ctrs));
362         ptr = nt_init(ptr, NT_S390_PREFIX, &sa->prefix, sizeof(sa->prefix));
363         if (MACHINE_HAS_VX) {
364                 ptr = nt_init(ptr, NT_S390_VXRS_HIGH,
365                               &sa->vxrs_high, sizeof(sa->vxrs_high));
366                 ptr = nt_init(ptr, NT_S390_VXRS_LOW,
367                               &sa->vxrs_low, sizeof(sa->vxrs_low));
368         }
369         return ptr;
370 }
371 
372 /*
373  * Initialize prpsinfo note (new kernel)
374  */
375 static void *nt_prpsinfo(void *ptr)
376 {
377         struct elf_prpsinfo prpsinfo;
378 
379         memset(&prpsinfo, 0, sizeof(prpsinfo));
380         prpsinfo.pr_sname = 'R';
381         strcpy(prpsinfo.pr_fname, "vmlinux");
382         return nt_init(ptr, NT_PRPSINFO, &prpsinfo, sizeof(prpsinfo));
383 }
384 
385 /*
386  * Get vmcoreinfo using lowcore->vmcore_info (new kernel)
387  */
388 static void *get_vmcoreinfo_old(unsigned long *size)
389 {
390         char nt_name[11], *vmcoreinfo;
391         Elf64_Nhdr note;
392         void *addr;
393 
394         if (copy_oldmem_kernel(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
395                 return NULL;
396         memset(nt_name, 0, sizeof(nt_name));
397         if (copy_oldmem_kernel(&note, addr, sizeof(note)))
398                 return NULL;
399         if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
400                                sizeof(nt_name) - 1))
401                 return NULL;
402         if (strcmp(nt_name, "VMCOREINFO") != 0)
403                 return NULL;
404         vmcoreinfo = kzalloc_panic(note.n_descsz);
405         if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz))
406                 return NULL;
407         *size = note.n_descsz;
408         return vmcoreinfo;
409 }
410 
411 /*
412  * Initialize vmcoreinfo note (new kernel)
413  */
414 static void *nt_vmcoreinfo(void *ptr)
415 {
416         unsigned long size;
417         void *vmcoreinfo;
418 
419         vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
420         if (!vmcoreinfo)
421                 vmcoreinfo = get_vmcoreinfo_old(&size);
422         if (!vmcoreinfo)
423                 return ptr;
424         return nt_init_name(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
425 }
426 
427 /*
428  * Initialize ELF header (new kernel)
429  */
430 static void *ehdr_init(Elf64_Ehdr *ehdr, int mem_chunk_cnt)
431 {
432         memset(ehdr, 0, sizeof(*ehdr));
433         memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
434         ehdr->e_ident[EI_CLASS] = ELFCLASS64;
435         ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
436         ehdr->e_ident[EI_VERSION] = EV_CURRENT;
437         memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
438         ehdr->e_type = ET_CORE;
439         ehdr->e_machine = EM_S390;
440         ehdr->e_version = EV_CURRENT;
441         ehdr->e_phoff = sizeof(Elf64_Ehdr);
442         ehdr->e_ehsize = sizeof(Elf64_Ehdr);
443         ehdr->e_phentsize = sizeof(Elf64_Phdr);
444         ehdr->e_phnum = mem_chunk_cnt + 1;
445         return ehdr + 1;
446 }
447 
448 /*
449  * Return CPU count for ELF header (new kernel)
450  */
451 static int get_cpu_cnt(void)
452 {
453         struct save_area *sa;
454         int cpus = 0;
455 
456         list_for_each_entry(sa, &dump_save_areas, list)
457                 if (sa->prefix != 0)
458                         cpus++;
459         return cpus;
460 }
461 
462 /*
463  * Return memory chunk count for ELF header (new kernel)
464  */
465 static int get_mem_chunk_cnt(void)
466 {
467         int cnt = 0;
468         u64 idx;
469 
470         for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
471                            MEMBLOCK_NONE, NULL, NULL, NULL)
472                 cnt++;
473         return cnt;
474 }
475 
476 /*
477  * Initialize ELF loads (new kernel)
478  */
479 static void loads_init(Elf64_Phdr *phdr, u64 loads_offset)
480 {
481         phys_addr_t start, end;
482         u64 idx;
483 
484         for_each_mem_range(idx, &memblock.physmem, &oldmem_type, NUMA_NO_NODE,
485                            MEMBLOCK_NONE, &start, &end, NULL) {
486                 phdr->p_filesz = end - start;
487                 phdr->p_type = PT_LOAD;
488                 phdr->p_offset = start;
489                 phdr->p_vaddr = start;
490                 phdr->p_paddr = start;
491                 phdr->p_memsz = end - start;
492                 phdr->p_flags = PF_R | PF_W | PF_X;
493                 phdr->p_align = PAGE_SIZE;
494                 phdr++;
495         }
496 }
497 
498 /*
499  * Initialize notes (new kernel)
500  */
501 static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
502 {
503         struct save_area *sa;
504         void *ptr_start = ptr;
505         int cpu;
506 
507         ptr = nt_prpsinfo(ptr);
508 
509         cpu = 1;
510         list_for_each_entry(sa, &dump_save_areas, list)
511                 if (sa->prefix != 0)
512                         ptr = fill_cpu_elf_notes(ptr, cpu++, sa);
513         ptr = nt_vmcoreinfo(ptr);
514         memset(phdr, 0, sizeof(*phdr));
515         phdr->p_type = PT_NOTE;
516         phdr->p_offset = notes_offset;
517         phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
518         phdr->p_memsz = phdr->p_filesz;
519         return ptr;
520 }
521 
522 /*
523  * Create ELF core header (new kernel)
524  */
525 int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
526 {
527         Elf64_Phdr *phdr_notes, *phdr_loads;
528         int mem_chunk_cnt;
529         void *ptr, *hdr;
530         u32 alloc_size;
531         u64 hdr_off;
532 
533         /* If we are not in kdump or zfcpdump mode return */
534         if (!OLDMEM_BASE && ipl_info.type != IPL_TYPE_FCP_DUMP)
535                 return 0;
536         /* If we cannot get HSA size for zfcpdump return error */
537         if (ipl_info.type == IPL_TYPE_FCP_DUMP && !sclp.hsa_size)
538                 return -ENODEV;
539 
540         /* For kdump, exclude previous crashkernel memory */
541         if (OLDMEM_BASE) {
542                 oldmem_region.base = OLDMEM_BASE;
543                 oldmem_region.size = OLDMEM_SIZE;
544                 oldmem_type.total_size = OLDMEM_SIZE;
545         }
546 
547         mem_chunk_cnt = get_mem_chunk_cnt();
548 
549         alloc_size = 0x1000 + get_cpu_cnt() * 0x4a0 +
550                 mem_chunk_cnt * sizeof(Elf64_Phdr);
551         hdr = kzalloc_panic(alloc_size);
552         /* Init elf header */
553         ptr = ehdr_init(hdr, mem_chunk_cnt);
554         /* Init program headers */
555         phdr_notes = ptr;
556         ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr));
557         phdr_loads = ptr;
558         ptr = PTR_ADD(ptr, sizeof(Elf64_Phdr) * mem_chunk_cnt);
559         /* Init notes */
560         hdr_off = PTR_DIFF(ptr, hdr);
561         ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off);
562         /* Init loads */
563         hdr_off = PTR_DIFF(ptr, hdr);
564         loads_init(phdr_loads, hdr_off);
565         *addr = (unsigned long long) hdr;
566         *size = (unsigned long long) hdr_off;
567         BUG_ON(elfcorehdr_size > alloc_size);
568         return 0;
569 }
570 
571 /*
572  * Free ELF core header (new kernel)
573  */
574 void elfcorehdr_free(unsigned long long addr)
575 {
576         kfree((void *)(unsigned long)addr);
577 }
578 
579 /*
580  * Read from ELF header
581  */
582 ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
583 {
584         void *src = (void *)(unsigned long)*ppos;
585 
586         memcpy(buf, src, count);
587         *ppos += count;
588         return count;
589 }
590 
591 /*
592  * Read from ELF notes data
593  */
594 ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
595 {
596         void *src = (void *)(unsigned long)*ppos;
597 
598         memcpy(buf, src, count);
599         *ppos += count;
600         return count;
601 }
602 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp