arch/x86/um/elfcore.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/elf.h>
   3 #include <linux/elfcore.h>
   4 #include <linux/coredump.h>
   5 #include <linux/fs.h>
   6 #include <linux/mm.h>
   7
   8 #include <asm/elf.h>
   9
  10
  11 Elf32_Half elf_core_extra_phdrs(struct coredump_params *cprm)
  12 {
  13         return vsyscall_ehdr ? (((struct elfhdr *)vsyscall_ehdr)->e_phnum) : 0;
  14 }
  15
  16 int elf_core_write_extra_phdrs(struct coredump_params *cprm, loff_t offset)
  17 {
  18         if ( vsyscall_ehdr ) {
  19                 const struct elfhdr *const ehdrp =
  20                         (struct elfhdr *) vsyscall_ehdr;
  21                 const struct elf_phdr *const phdrp =
  22                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  23                 int i;
  24                 Elf32_Off ofs = 0;
  25
  26                 for (i = 0; i < ehdrp->e_phnum; ++i) {
  27                         struct elf_phdr phdr = phdrp[i];
  28
  29                         if (phdr.p_type == PT_LOAD) {
  30                                 ofs = phdr.p_offset = offset;
  31                                 offset += phdr.p_filesz;
  32                         } else {
  33                                 phdr.p_offset += ofs;
  34                         }
  35                         phdr.p_paddr = 0; /* match other core phdrs */
  36                         if (!dump_emit(cprm, &phdr, sizeof(phdr)))
  37                                 return 0;
  38                 }
  39         }
  40         return 1;
  41 }
  42
  43 int elf_core_write_extra_data(struct coredump_params *cprm)
  44 {
  45         if ( vsyscall_ehdr ) {
  46                 const struct elfhdr *const ehdrp =
  47                         (struct elfhdr *) vsyscall_ehdr;
  48                 const struct elf_phdr *const phdrp =
  49                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  50                 int i;
  51
  52                 for (i = 0; i < ehdrp->e_phnum; ++i) {
  53                         if (phdrp[i].p_type == PT_LOAD) {
  54                                 void *addr = (void *) phdrp[i].p_vaddr;
  55                                 size_t filesz = phdrp[i].p_filesz;
  56                                 if (!dump_emit(cprm, addr, filesz))
  57                                         return 0;
  58                         }
  59                 }
  60         }
  61         return 1;
  62 }
  63
  64 size_t elf_core_extra_data_size(struct coredump_params *cprm)
  65 {
  66         if ( vsyscall_ehdr ) {
  67                 const struct elfhdr *const ehdrp =
  68                         (struct elfhdr *)vsyscall_ehdr;
  69                 const struct elf_phdr *const phdrp =
  70                         (const struct elf_phdr *) (vsyscall_ehdr + ehdrp->e_phoff);
  71                 int i;
  72
  73                 for (i = 0; i < ehdrp->e_phnum; ++i)
  74                         if (phdrp[i].p_type == PT_LOAD)
  75                                 return (size_t) phdrp[i].p_filesz;
  76         }
  77         return 0;
  78 }