arch/s390/kernel/machine_kexec_reloc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/elf.h>
   3 #include <asm/kexec.h>
   4
   5 int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
   6                          unsigned long addr)
   7 {
   8         switch (r_type) {
   9         case R_390_NONE:
  10                 break;
  11         case R_390_8:           /* Direct 8 bit.   */
  12                 *(u8 *)loc = val;
  13                 break;
  14         case R_390_12:          /* Direct 12 bit.  */
  15                 *(u16 *)loc &= 0xf000;
  16                 *(u16 *)loc |= val & 0xfff;
  17                 break;
  18         case R_390_16:          /* Direct 16 bit.  */
  19                 *(u16 *)loc = val;
  20                 break;
  21         case R_390_20:          /* Direct 20 bit.  */
  22                 *(u32 *)loc &= 0xf00000ff;
  23                 *(u32 *)loc |= (val & 0xfff) << 16;     /* DL */
  24                 *(u32 *)loc |= (val & 0xff000) >> 4;    /* DH */
  25                 break;
  26         case R_390_32:          /* Direct 32 bit.  */
  27                 *(u32 *)loc = val;
  28                 break;
  29         case R_390_64:          /* Direct 64 bit.  */
  30         case R_390_GLOB_DAT:
  31         case R_390_JMP_SLOT:
  32                 *(u64 *)loc = val;
  33                 break;
  34         case R_390_PC16:        /* PC relative 16 bit.  */
  35                 *(u16 *)loc = (val - addr);
  36                 break;
  37         case R_390_PC16DBL:     /* PC relative 16 bit shifted by 1.  */
  38                 *(u16 *)loc = (val - addr) >> 1;
  39                 break;
  40         case R_390_PC32DBL:     /* PC relative 32 bit shifted by 1.  */
  41                 *(u32 *)loc = (val - addr) >> 1;
  42                 break;
  43         case R_390_PC32:        /* PC relative 32 bit.  */
  44                 *(u32 *)loc = (val - addr);
  45                 break;
  46         case R_390_PC64:        /* PC relative 64 bit.  */
  47                 *(u64 *)loc = (val - addr);
  48                 break;
  49         case R_390_RELATIVE:
  50                 *(unsigned long *) loc = val;
  51                 break;
  52         default:
  53                 return 1;
  54         }
  55         return 0;
  56 }