arch/x86/um/elfcore.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/elf.h>
   3 #include <linux/coredump.h>
   4 #include <linux/fs.h>
   5 #include <linux/mm.h>
   6
   7 #include <asm/elf.h>
   8
   9
  10 Elf32_Half elf_core_extra_phdrs(void)
  11 {
  12         return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
  13 }
  14
  15 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
  16 {
  17         if ( vsyscall_ehdr ) {
  18                 const struct elfhdr *const ehdrp =
  19                         (struct elfhdr *) vsyscall_ehdr;
  20                 const struct elf_phdr *const phdrp =
  21                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  22                 int i;
  23                 Elf32_Off ofs = 0;
  24
  25                 for (i = 0; i < ehdrp->e_phnum; ++i) {
  26                         struct elf_phdr phdr = phdrp[i];
  27
  28                         if (phdr.p_type == PT_LOAD) {
  29                                 ofs = phdr.p_offset = offset;
  30                                 offset += phdr.p_filesz;
  31                         } else {
  32                                 phdr.p_offset += ofs;
  33                         }
  34                         phdr.p_paddr = 0; /* match other core phdrs */
  35                         if (!dump_emit(cprm, &phdr, sizeof(phdr)))
  36                                 return 0;
  37                 }
  38         }
  39         return 1;
  40 }
  41
  42 int elf_core_write_extra_data(struct coredump_params *cprm)
  43 {
  44         if ( vsyscall_ehdr ) {
  45                 const struct elfhdr *const ehdrp =
  46                         (struct elfhdr *) vsyscall_ehdr;
  47                 const struct elf_phdr *const phdrp =
  48                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  49                 int i;
  50
  51                 for (i = 0; i < ehdrp->e_phnum; ++i) {
  52                         if (phdrp[i].p_type == PT_LOAD) {
  53                                 void *addr = (void *) phdrp[i].p_vaddr;
  54                                 size_t filesz = phdrp[i].p_filesz;
  55                                 if (!dump_emit(cprm, addr, filesz))
  56                                         return 0;
  57                         }
  58                 }
  59         }
  60         return 1;
  61 }
  62
  63 size_t elf_core_extra_data_size(void)
  64 {
  65         if ( vsyscall_ehdr ) {
  66                 const struct elfhdr *const ehdrp =
  67                         (struct elfhdr *)vsyscall_ehdr;
  68                 const struct elf_phdr *const phdrp =
  69                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  70                 int i;
  71
  72                 for (i = 0; i < ehdrp->e_phnum; ++i)
  73                         if (phdrp[i].p_type == PT_LOAD)
  74                                 return (size_t) phdrp[i].p_filesz;
  75         }
  76         return 0;
  77 }