arch/s390/kernel/machine_kexec_reloc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/elf.h>
   3
   4 int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
   5                          unsigned long addr)
   6 {
   7         switch (r_type) {
   8         case R_390_NONE:
   9                 break;
  10         case R_390_8:           /* Direct 8 bit.   */
  11                 *(u8 *)loc = val;
  12                 break;
  13         case R_390_12:          /* Direct 12 bit.  */
  14                 *(u16 *)loc &= 0xf000;
  15                 *(u16 *)loc |= val & 0xfff;
  16                 break;
  17         case R_390_16:          /* Direct 16 bit.  */
  18                 *(u16 *)loc = val;
  19                 break;
  20         case R_390_20:          /* Direct 20 bit.  */
  21                 *(u32 *)loc &= 0xf00000ff;
  22                 *(u32 *)loc |= (val & 0xfff) << 16;     /* DL */
  23                 *(u32 *)loc |= (val & 0xff000) >> 4;    /* DH */
  24                 break;
  25         case R_390_32:          /* Direct 32 bit.  */
  26                 *(u32 *)loc = val;
  27                 break;
  28         case R_390_64:          /* Direct 64 bit.  */
  29                 *(u64 *)loc = val;
  30                 break;
  31         case R_390_PC16:        /* PC relative 16 bit.  */
  32                 *(u16 *)loc = (val - addr);
  33                 break;
  34         case R_390_PC16DBL:     /* PC relative 16 bit shifted by 1.  */
  35                 *(u16 *)loc = (val - addr) >> 1;
  36                 break;
  37         case R_390_PC32DBL:     /* PC relative 32 bit shifted by 1.  */
  38                 *(u32 *)loc = (val - addr) >> 1;
  39                 break;
  40         case R_390_PC32:        /* PC relative 32 bit.  */
  41                 *(u32 *)loc = (val - addr);
  42                 break;
  43         case R_390_PC64:        /* PC relative 64 bit.  */
  44                 *(u64 *)loc = (val - addr);
  45                 break;
  46         case R_390_RELATIVE:
  47                 *(unsigned long *) loc = val;
  48                 break;
  49         default:
  50                 return 1;
  51         }
  52         return 0;
  53 }