crash_dump.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * S390 kdump implementation
  4 *
  5 * Copyright IBM Corp. 2011
  6 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
  7 */
  8
  9#include <linux/crash_dump.h>
 10#include <linux/export.h>
 11#include <asm/lowcore.h>
 12#include <linux/kernel.h>
 13#include <linux/init.h>
 14#include <linux/mm.h>
 15#include <linux/gfp.h>
 16#include <linux/slab.h>
 17#include <linux/memblock.h>
 18#include <linux/elf.h>
 19#include <linux/uio.h>
 20#include <asm/asm-offsets.h>
 21#include <asm/os_info.h>
 22#include <asm/elf.h>
 23#include <asm/ipl.h>
 24#include <asm/sclp.h>
 25#include <asm/maccess.h>
 26#include <asm/fpu.h>
 27
 28#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
 29#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
 30#define PTR_DIFF(x, y) ((unsigned long)(((char *) (x)) - ((unsigned long) (y))))
 31
 32static struct memblock_region oldmem_region;
 33
 34static struct memblock_type oldmem_type = {
 35	.cnt = 1,
 36	.max = 1,
 37	.total_size = 0,
 38	.regions = &oldmem_region,
 39	.name = "oldmem",
 40};
 41
 42struct save_area {
 43	struct list_head list;
 44	u64 psw[2];
 45	u64 ctrs[16];
 46	u64 gprs[16];
 47	u32 acrs[16];
 48	u64 fprs[16];
 49	u32 fpc;
 50	u32 prefix;
 51	u32 todpreg;
 52	u64 timer;
 53	u64 todcmp;
 54	u64 vxrs_low[16];
 55	__vector128 vxrs_high[16];
 56};
 57
 58static LIST_HEAD(dump_save_areas);
 59
 60/*
 61 * Allocate a save area
 62 */
 63struct save_area * __init save_area_alloc(bool is_boot_cpu)
 64{
 65	struct save_area *sa;
 66
 67	sa = memblock_alloc_or_panic(sizeof(*sa), 8);
 68
 69	if (is_boot_cpu)
 70		list_add(&sa->list, &dump_save_areas);
 71	else
 72		list_add_tail(&sa->list, &dump_save_areas);
 73	return sa;
 74}
 75
 76/*
 77 * Return the address of the save area for the boot CPU
 78 */
 79struct save_area * __init save_area_boot_cpu(void)
 80{
 81	return list_first_entry_or_null(&dump_save_areas, struct save_area, list);
 82}
 83
 84/*
 85 * Copy CPU registers into the save area
 86 */
 87void __init save_area_add_regs(struct save_area *sa, void *regs)
 88{
 89	struct lowcore *lc;
 90
 91	lc = (struct lowcore *)(regs - __LC_FPREGS_SAVE_AREA);
 92	memcpy(&sa->psw, &lc->psw_save_area, sizeof(sa->psw));
 93	memcpy(&sa->ctrs, &lc->cregs_save_area, sizeof(sa->ctrs));
 94	memcpy(&sa->gprs, &lc->gpregs_save_area, sizeof(sa->gprs));
 95	memcpy(&sa->acrs, &lc->access_regs_save_area, sizeof(sa->acrs));
 96	memcpy(&sa->fprs, &lc->floating_pt_save_area, sizeof(sa->fprs));
 97	memcpy(&sa->fpc, &lc->fpt_creg_save_area, sizeof(sa->fpc));
 98	memcpy(&sa->prefix, &lc->prefixreg_save_area, sizeof(sa->prefix));
 99	memcpy(&sa->todpreg, &lc->tod_progreg_save_area, sizeof(sa->todpreg));
100	memcpy(&sa->timer, &lc->cpu_timer_save_area, sizeof(sa->timer));
101	memcpy(&sa->todcmp, &lc->clock_comp_save_area, sizeof(sa->todcmp));
102}
103
104/*
105 * Copy vector registers into the save area
106 */
107void __init save_area_add_vxrs(struct save_area *sa, __vector128 *vxrs)
108{
109	int i;
110
111	/* Copy lower halves of vector registers 0-15 */
112	for (i = 0; i < 16; i++)
113		sa->vxrs_low[i] = vxrs[i].low;
114	/* Copy vector registers 16-31 */
115	memcpy(sa->vxrs_high, vxrs + 16, 16 * sizeof(__vector128));
116}
117
118static size_t copy_oldmem_iter(struct iov_iter *iter, unsigned long src, size_t count)
119{
120	size_t len, copied, res = 0;
121
122	while (count) {
123		if (!oldmem_data.start && src < sclp.hsa_size) {
124			/* Copy from zfcp/nvme dump HSA area */
125			len = min(count, sclp.hsa_size - src);
126			copied = memcpy_hsa_iter(iter, src, len);
127		} else {
128			/* Check for swapped kdump oldmem areas */
129			if (oldmem_data.start && src - oldmem_data.start < oldmem_data.size) {
130				src -= oldmem_data.start;
131				len = min(count, oldmem_data.size - src);
132			} else if (oldmem_data.start && src < oldmem_data.size) {
133				len = min(count, oldmem_data.size - src);
134				src += oldmem_data.start;
135			} else {
136				len = count;
137			}
138			copied = memcpy_real_iter(iter, src, len);
139		}
140		count -= copied;
141		src += copied;
142		res += copied;
143		if (copied < len)
144			break;
145	}
146	return res;
147}
148
149int copy_oldmem_kernel(void *dst, unsigned long src, size_t count)
150{
151	struct iov_iter iter;
152	struct kvec kvec;
153
154	kvec.iov_base = dst;
155	kvec.iov_len = count;
156	iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
157	if (copy_oldmem_iter(&iter, src, count) < count)
158		return -EFAULT;
159	return 0;
160}
161
162/*
163 * Copy one page from "oldmem"
164 */
165ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, size_t csize,
166			 unsigned long offset)
167{
168	unsigned long src;
169
170	src = pfn_to_phys(pfn) + offset;
171	return copy_oldmem_iter(iter, src, csize);
172}
173
174/*
175 * Remap "oldmem" for kdump
176 *
177 * For the kdump reserved memory this functions performs a swap operation:
178 * [0 - OLDMEM_SIZE] is mapped to [OLDMEM_BASE - OLDMEM_BASE + OLDMEM_SIZE]
179 */
180static int remap_oldmem_pfn_range_kdump(struct vm_area_struct *vma,
181					unsigned long from, unsigned long pfn,
182					unsigned long size, pgprot_t prot)
183{
184	unsigned long size_old;
185	int rc;
186
187	if (pfn < oldmem_data.size >> PAGE_SHIFT) {
188		size_old = min(size, oldmem_data.size - (pfn << PAGE_SHIFT));
189		rc = remap_pfn_range(vma, from,
190				     pfn + (oldmem_data.start >> PAGE_SHIFT),
191				     size_old, prot);
192		if (rc || size == size_old)
193			return rc;
194		size -= size_old;
195		from += size_old;
196		pfn += size_old >> PAGE_SHIFT;
197	}
198	return remap_pfn_range(vma, from, pfn, size, prot);
199}
200
201/*
202 * Remap "oldmem" for zfcp/nvme dump
203 *
204 * We only map available memory above HSA size. Memory below HSA size
205 * is read on demand using the copy_oldmem_page() function.
206 */
207static int remap_oldmem_pfn_range_zfcpdump(struct vm_area_struct *vma,
208					   unsigned long from,
209					   unsigned long pfn,
210					   unsigned long size, pgprot_t prot)
211{
212	unsigned long hsa_end = sclp.hsa_size;
213	unsigned long size_hsa;
214
215	if (pfn < hsa_end >> PAGE_SHIFT) {
216		size_hsa = min(size, hsa_end - (pfn << PAGE_SHIFT));
217		if (size == size_hsa)
218			return 0;
219		size -= size_hsa;
220		from += size_hsa;
221		pfn += size_hsa >> PAGE_SHIFT;
222	}
223	return remap_pfn_range(vma, from, pfn, size, prot);
224}
225
226/*
227 * Remap "oldmem" for kdump or zfcp/nvme dump
228 */
229int remap_oldmem_pfn_range(struct vm_area_struct *vma, unsigned long from,
230			   unsigned long pfn, unsigned long size, pgprot_t prot)
231{
232	if (oldmem_data.start)
233		return remap_oldmem_pfn_range_kdump(vma, from, pfn, size, prot);
234	else
235		return remap_oldmem_pfn_range_zfcpdump(vma, from, pfn, size,
236						       prot);
237}
238
239/*
240 * Return true only when in a kdump or stand-alone kdump environment.
241 * Note that /proc/vmcore might also be available in "standard zfcp/nvme dump"
242 * environments, where this function returns false; see dump_available().
243 */
244bool is_kdump_kernel(void)
245{
246	return oldmem_data.start;
247}
248EXPORT_SYMBOL_GPL(is_kdump_kernel);
249
250/*
251 * Initialize ELF note
252 */
253static void *nt_init_name(void *buf, Elf64_Word type, void *desc, int d_len,
254			  const char *name)
255{
256	Elf64_Nhdr *note;
257	u64 len;
258
259	note = (Elf64_Nhdr *)buf;
260	note->n_namesz = strlen(name) + 1;
261	note->n_descsz = d_len;
262	note->n_type = type;
263	len = sizeof(Elf64_Nhdr);
264
265	memcpy(buf + len, name, note->n_namesz);
266	len = roundup(len + note->n_namesz, 4);
267
268	memcpy(buf + len, desc, note->n_descsz);
269	len = roundup(len + note->n_descsz, 4);
270
271	return PTR_ADD(buf, len);
272}
273
274#define nt_init(buf, type, desc) \
275	nt_init_name(buf, NT_ ## type, &(desc), sizeof(desc), NN_ ## type)
276
277/*
278 * Calculate the size of ELF note
279 */
280static size_t nt_size_name(int d_len, const char *name)
281{
282	size_t size;
283
284	size = sizeof(Elf64_Nhdr);
285	size += roundup(strlen(name) + 1, 4);
286	size += roundup(d_len, 4);
287
288	return size;
289}
290
291#define nt_size(type, desc) nt_size_name(sizeof(desc), NN_ ## type)
292
293/*
294 * Fill ELF notes for one CPU with save area registers
295 */
296static void *fill_cpu_elf_notes(void *ptr, int cpu, struct save_area *sa)
297{
298	struct elf_prstatus nt_prstatus;
299	elf_fpregset_t nt_fpregset;
300
301	/* Prepare prstatus note */
302	memset(&nt_prstatus, 0, sizeof(nt_prstatus));
303	memcpy(&nt_prstatus.pr_reg.gprs, sa->gprs, sizeof(sa->gprs));
304	memcpy(&nt_prstatus.pr_reg.psw, sa->psw, sizeof(sa->psw));
305	memcpy(&nt_prstatus.pr_reg.acrs, sa->acrs, sizeof(sa->acrs));
306	nt_prstatus.common.pr_pid = cpu;
307	/* Prepare fpregset (floating point) note */
308	memset(&nt_fpregset, 0, sizeof(nt_fpregset));
309	memcpy(&nt_fpregset.fpc, &sa->fpc, sizeof(sa->fpc));
310	memcpy(&nt_fpregset.fprs, &sa->fprs, sizeof(sa->fprs));
311	/* Create ELF notes for the CPU */
312	ptr = nt_init(ptr, PRSTATUS, nt_prstatus);
313	ptr = nt_init(ptr, PRFPREG, nt_fpregset);
314	ptr = nt_init(ptr, S390_TIMER, sa->timer);
315	ptr = nt_init(ptr, S390_TODCMP, sa->todcmp);
316	ptr = nt_init(ptr, S390_TODPREG, sa->todpreg);
317	ptr = nt_init(ptr, S390_CTRS, sa->ctrs);
318	ptr = nt_init(ptr, S390_PREFIX, sa->prefix);
319	if (cpu_has_vx()) {
320		ptr = nt_init(ptr, S390_VXRS_HIGH, sa->vxrs_high);
321		ptr = nt_init(ptr, S390_VXRS_LOW, sa->vxrs_low);
322	}
323	return ptr;
324}
325
326/*
327 * Calculate size of ELF notes per cpu
328 */
329static size_t get_cpu_elf_notes_size(void)
330{
331	struct save_area *sa = NULL;
332	size_t size;
333
334	size =	nt_size(PRSTATUS, struct elf_prstatus);
335	size += nt_size(PRFPREG, elf_fpregset_t);
336	size += nt_size(S390_TIMER, sa->timer);
337	size += nt_size(S390_TODCMP, sa->todcmp);
338	size += nt_size(S390_TODPREG, sa->todpreg);
339	size += nt_size(S390_CTRS, sa->ctrs);
340	size += nt_size(S390_PREFIX, sa->prefix);
341	if (cpu_has_vx()) {
342		size += nt_size(S390_VXRS_HIGH, sa->vxrs_high);
343		size += nt_size(S390_VXRS_LOW, sa->vxrs_low);
344	}
345
346	return size;
347}
348
349/*
350 * Initialize prpsinfo note (new kernel)
351 */
352static void *nt_prpsinfo(void *ptr)
353{
354	struct elf_prpsinfo prpsinfo;
355
356	memset(&prpsinfo, 0, sizeof(prpsinfo));
357	prpsinfo.pr_sname = 'R';
358	strscpy(prpsinfo.pr_fname, "vmlinux");
359	return nt_init(ptr, PRPSINFO, prpsinfo);
360}
361
362/*
363 * Get vmcoreinfo using lowcore->vmcore_info (new kernel)
364 */
365static void *get_vmcoreinfo_old(unsigned long *size)
366{
367	char nt_name[11], *vmcoreinfo;
368	unsigned long addr;
369	Elf64_Nhdr note;
370
371	if (copy_oldmem_kernel(&addr, __LC_VMCORE_INFO, sizeof(addr)))
372		return NULL;
373	memset(nt_name, 0, sizeof(nt_name));
374	if (copy_oldmem_kernel(&note, addr, sizeof(note)))
375		return NULL;
376	if (copy_oldmem_kernel(nt_name, addr + sizeof(note),
377			       sizeof(nt_name) - 1))
378		return NULL;
379	if (strcmp(nt_name, VMCOREINFO_NOTE_NAME) != 0)
380		return NULL;
381	vmcoreinfo = kzalloc(note.n_descsz, GFP_KERNEL);
382	if (!vmcoreinfo)
383		return NULL;
384	if (copy_oldmem_kernel(vmcoreinfo, addr + 24, note.n_descsz)) {
385		kfree(vmcoreinfo);
386		return NULL;
387	}
388	*size = note.n_descsz;
389	return vmcoreinfo;
390}
391
392/*
393 * Initialize vmcoreinfo note (new kernel)
394 */
395static void *nt_vmcoreinfo(void *ptr)
396{
397	const char *name = VMCOREINFO_NOTE_NAME;
398	unsigned long size;
399	void *vmcoreinfo;
400
401	vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
402	if (vmcoreinfo)
403		return nt_init_name(ptr, 0, vmcoreinfo, size, name);
404
405	vmcoreinfo = get_vmcoreinfo_old(&size);
406	if (!vmcoreinfo)
407		return ptr;
408	ptr = nt_init_name(ptr, 0, vmcoreinfo, size, name);
409	kfree(vmcoreinfo);
410	return ptr;
411}
412
413static size_t nt_vmcoreinfo_size(void)
414{
415	const char *name = VMCOREINFO_NOTE_NAME;
416	unsigned long size;
417	void *vmcoreinfo;
418
419	vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
420	if (vmcoreinfo)
421		return nt_size_name(size, name);
422
423	vmcoreinfo = get_vmcoreinfo_old(&size);
424	if (!vmcoreinfo)
425		return 0;
426
427	kfree(vmcoreinfo);
428	return nt_size_name(size, name);
429}
430
431/*
432 * Initialize final note (needed for /proc/vmcore code)
433 */
434static void *nt_final(void *ptr)
435{
436	Elf64_Nhdr *note;
437
438	note = (Elf64_Nhdr *) ptr;
439	note->n_namesz = 0;
440	note->n_descsz = 0;
441	note->n_type = 0;
442	return PTR_ADD(ptr, sizeof(Elf64_Nhdr));
443}
444
445/*
446 * Initialize ELF header (new kernel)
447 */
448static void *ehdr_init(Elf64_Ehdr *ehdr, int phdr_count)
449{
450	memset(ehdr, 0, sizeof(*ehdr));
451	memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
452	ehdr->e_ident[EI_CLASS] = ELFCLASS64;
453	ehdr->e_ident[EI_DATA] = ELFDATA2MSB;
454	ehdr->e_ident[EI_VERSION] = EV_CURRENT;
455	memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
456	ehdr->e_type = ET_CORE;
457	ehdr->e_machine = EM_S390;
458	ehdr->e_version = EV_CURRENT;
459	ehdr->e_phoff = sizeof(Elf64_Ehdr);
460	ehdr->e_ehsize = sizeof(Elf64_Ehdr);
461	ehdr->e_phentsize = sizeof(Elf64_Phdr);
462	/* Number of PT_LOAD program headers plus PT_NOTE program header */
463	ehdr->e_phnum = phdr_count + 1;
464	return ehdr + 1;
465}
466
467/*
468 * Return CPU count for ELF header (new kernel)
469 */
470static int get_cpu_cnt(void)
471{
472	struct save_area *sa;
473	int cpus = 0;
474
475	list_for_each_entry(sa, &dump_save_areas, list)
476		if (sa->prefix != 0)
477			cpus++;
478	return cpus;
479}
480
481/*
482 * Return memory chunk count for ELF header (new kernel)
483 */
484static int get_mem_chunk_cnt(void)
485{
486	int cnt = 0;
487	u64 idx;
488
489	for_each_physmem_range(idx, &oldmem_type, NULL, NULL)
490		cnt++;
491	return cnt;
492}
493
494static void fill_ptload(Elf64_Phdr *phdr, unsigned long paddr,
495		unsigned long vaddr, unsigned long size)
496{
497	phdr->p_type = PT_LOAD;
498	phdr->p_vaddr = vaddr;
499	phdr->p_offset = paddr;
500	phdr->p_paddr = paddr;
501	phdr->p_filesz = size;
502	phdr->p_memsz = size;
503	phdr->p_flags = PF_R | PF_W | PF_X;
504	phdr->p_align = PAGE_SIZE;
505}
506
507/*
508 * Initialize ELF loads (new kernel)
509 */
510static void loads_init(Elf64_Phdr *phdr, bool os_info_has_vm)
511{
512	unsigned long old_identity_base = 0;
513	phys_addr_t start, end;
514	u64 idx;
515
516	if (os_info_has_vm)
517		old_identity_base = os_info_old_value(OS_INFO_IDENTITY_BASE);
518	for_each_physmem_range(idx, &oldmem_type, &start, &end) {
519		fill_ptload(phdr, start, old_identity_base + start,
520			    end - start);
521		phdr++;
522	}
523}
524
525static bool os_info_has_vm(void)
526{
527	return os_info_old_value(OS_INFO_KASLR_OFFSET);
528}
529
530#ifdef CONFIG_PROC_VMCORE_DEVICE_RAM
531/*
532 * Fill PT_LOAD for a physical memory range owned by a device and detected by
533 * its device driver.
534 */
535void elfcorehdr_fill_device_ram_ptload_elf64(Elf64_Phdr *phdr,
536		unsigned long long paddr, unsigned long long size)
537{
538	unsigned long old_identity_base = 0;
539
540	if (os_info_has_vm())
541		old_identity_base = os_info_old_value(OS_INFO_IDENTITY_BASE);
542	fill_ptload(phdr, paddr, old_identity_base + paddr, size);
543}
544#endif
545
546/*
547 * Prepare PT_LOAD type program header for kernel image region
548 */
549static void text_init(Elf64_Phdr *phdr)
550{
551	unsigned long start_phys = os_info_old_value(OS_INFO_IMAGE_PHYS);
552	unsigned long start = os_info_old_value(OS_INFO_IMAGE_START);
553	unsigned long end = os_info_old_value(OS_INFO_IMAGE_END);
554
555	phdr->p_type = PT_LOAD;
556	phdr->p_vaddr = start;
557	phdr->p_filesz = end - start;
558	phdr->p_memsz = end - start;
559	phdr->p_offset = start_phys;
560	phdr->p_paddr = start_phys;
561	phdr->p_flags = PF_R | PF_W | PF_X;
562	phdr->p_align = PAGE_SIZE;
563}
564
565/*
566 * Initialize notes (new kernel)
567 */
568static void *notes_init(Elf64_Phdr *phdr, void *ptr, u64 notes_offset)
569{
570	struct save_area *sa;
571	void *ptr_start = ptr;
572	int cpu;
573
574	ptr = nt_prpsinfo(ptr);
575
576	cpu = 1;
577	list_for_each_entry(sa, &dump_save_areas, list)
578		if (sa->prefix != 0)
579			ptr = fill_cpu_elf_notes(ptr, cpu++, sa);
580	ptr = nt_vmcoreinfo(ptr);
581	ptr = nt_final(ptr);
582	memset(phdr, 0, sizeof(*phdr));
583	phdr->p_type = PT_NOTE;
584	phdr->p_offset = notes_offset;
585	phdr->p_filesz = (unsigned long) PTR_SUB(ptr, ptr_start);
586	phdr->p_memsz = phdr->p_filesz;
587	return ptr;
588}
589
590static size_t get_elfcorehdr_size(int phdr_count)
591{
592	size_t size;
593
594	size = sizeof(Elf64_Ehdr);
595	/* PT_NOTES */
596	size += sizeof(Elf64_Phdr);
597	/* nt_prpsinfo */
598	size += nt_size(PRPSINFO, struct elf_prpsinfo);
599	/* regsets */
600	size += get_cpu_cnt() * get_cpu_elf_notes_size();
601	/* nt_vmcoreinfo */
602	size += nt_vmcoreinfo_size();
603	/* nt_final */
604	size += sizeof(Elf64_Nhdr);
605	/* PT_LOADS */
606	size += phdr_count * sizeof(Elf64_Phdr);
607
608	return size;
609}
610
611/*
612 * Create ELF core header (new kernel)
613 */
614int elfcorehdr_alloc(unsigned long long *addr, unsigned long long *size)
615{
616	Elf64_Phdr *phdr_notes, *phdr_loads, *phdr_text;
617	int mem_chunk_cnt, phdr_text_cnt;
618	size_t alloc_size;
619	void *ptr, *hdr;
620	u64 hdr_off;
621
622	/* If we are not in kdump or zfcp/nvme dump mode return */
623	if (!oldmem_data.start && !is_ipl_type_dump())
624		return 0;
625	/* If we cannot get HSA size for zfcp/nvme dump return error */
626	if (is_ipl_type_dump() && !sclp.hsa_size)
627		return -ENODEV;
628
629	/* For kdump, exclude previous crashkernel memory */
630	if (oldmem_data.start) {
631		oldmem_region.base = oldmem_data.start;
632		oldmem_region.size = oldmem_data.size;
633		oldmem_type.total_size = oldmem_data.size;
634	}
635
636	mem_chunk_cnt = get_mem_chunk_cnt();
637	phdr_text_cnt = os_info_has_vm() ? 1 : 0;
638
639	alloc_size = get_elfcorehdr_size(mem_chunk_cnt + phdr_text_cnt);
640
641	hdr = kzalloc(alloc_size, GFP_KERNEL);
642
643	/*
644	 * Without elfcorehdr /proc/vmcore cannot be created. Thus creating
645	 * a dump with this crash kernel will fail. Panic now to allow other
646	 * dump mechanisms to take over.
647	 */
648	if (!hdr)
649		panic("s390 kdump allocating elfcorehdr failed");
650
651	/* Init elf header */
652	phdr_notes = ehdr_init(hdr, mem_chunk_cnt + phdr_text_cnt);
653	/* Init program headers */
654	if (phdr_text_cnt) {
655		phdr_text = phdr_notes + 1;
656		phdr_loads = phdr_text + 1;
657	} else {
658		phdr_loads = phdr_notes + 1;
659	}
660	ptr = PTR_ADD(phdr_loads, sizeof(Elf64_Phdr) * mem_chunk_cnt);
661	/* Init notes */
662	hdr_off = PTR_DIFF(ptr, hdr);
663	ptr = notes_init(phdr_notes, ptr, ((unsigned long) hdr) + hdr_off);
664	/* Init kernel text program header */
665	if (phdr_text_cnt)
666		text_init(phdr_text);
667	/* Init loads */
668	loads_init(phdr_loads, phdr_text_cnt);
669	/* Finalize program headers */
670	hdr_off = PTR_DIFF(ptr, hdr);
671	*addr = (unsigned long long) hdr;
672	*size = (unsigned long long) hdr_off;
673	BUG_ON(elfcorehdr_size > alloc_size);
674	return 0;
675}
676
677/*
678 * Free ELF core header (new kernel)
679 */
680void elfcorehdr_free(unsigned long long addr)
681{
682	kfree((void *)(unsigned long)addr);
683}
684
685/*
686 * Read from ELF header
687 */
688ssize_t elfcorehdr_read(char *buf, size_t count, u64 *ppos)
689{
690	void *src = (void *)(unsigned long)*ppos;
691
692	memcpy(buf, src, count);
693	*ppos += count;
694	return count;
695}
696
697/*
698 * Read from ELF notes data
699 */
700ssize_t elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
701{
702	void *src = (void *)(unsigned long)*ppos;
703
704	memcpy(buf, src, count);
705	*ppos += count;
706	return count;
707}