#include <linux/elf.h>
  #include <linux/coredump.h>
  #include <linux/fs.h>
  #include <linux/mm.h>
  
  #include <asm/elf.h>
  
  
  Elf64_Half elf_core_extra_phdrs(void)
  {
  	return GATE_EHDR->e_phnum;
  }
  
  int elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
  			       unsigned long limit)
  {
  	const struct elf_phdr *const gate_phdrs =
  		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
  	int i;
  	Elf64_Off ofs = 0;
  
  	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
  		struct elf_phdr phdr = gate_phdrs[i];
  
  		if (phdr.p_type == PT_LOAD) {
  			phdr.p_memsz = PAGE_ALIGN(phdr.p_memsz);
  			phdr.p_filesz = phdr.p_memsz;
  			if (ofs == 0) {
  				ofs = phdr.p_offset = offset;
  				offset += phdr.p_filesz;
  			} else {
  				phdr.p_offset = ofs;
  			}
  		} else {
  			phdr.p_offset += ofs;
  		}
  		phdr.p_paddr = 0; /* match other core phdrs */
  		*size += sizeof(phdr);
  		if (*size > limit || !dump_write(file, &phdr, sizeof(phdr)))
  			return 0;
  	}
  	return 1;
  }
  
  int elf_core_write_extra_data(struct file *file, size_t *size,
  			      unsigned long limit)
  {
  	const struct elf_phdr *const gate_phdrs =
  		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
  	int i;
  
  	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
  		if (gate_phdrs[i].p_type == PT_LOAD) {
  			void *addr = (void *)gate_phdrs[i].p_vaddr;
  			size_t memsz = PAGE_ALIGN(gate_phdrs[i].p_memsz);
  
  			*size += memsz;
  			if (*size > limit || !dump_write(file, addr, memsz))
  				return 0;
  			break;
  		}
  	}
  	return 1;
  }

  
  size_t elf_core_extra_data_size(void)
  {
  	const struct elf_phdr *const gate_phdrs =
  		(const struct elf_phdr *) (GATE_ADDR + GATE_EHDR->e_phoff);
  	int i;
  	size_t size = 0;
  
  	for (i = 0; i < GATE_EHDR->e_phnum; ++i) {
  		if (gate_phdrs[i].p_type == PT_LOAD) {
  			size += PAGE_ALIGN(gate_phdrs[i].p_memsz);
  			break;
  		}
  	}
  	return size;
  }