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 }
57