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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/kernel/machine_kexec_reloc.c
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// SPDX-License-Identifier: GPL-2.0

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#include <linux/elf.h>

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#include <asm/kexec.h>

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int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,

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			 unsigned long addr)

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{

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	switch (r_type) {

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	case R_390_NONE:

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		break;

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	case R_390_8:		/* Direct 8 bit.   */

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		*(u8 *)loc = val;

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		break;

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	case R_390_12:		/* Direct 12 bit.  */

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		*(u16 *)loc &= 0xf000;

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		*(u16 *)loc |= val & 0xfff;

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		break;

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	case R_390_16:		/* Direct 16 bit.  */

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		*(u16 *)loc = val;

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		break;

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	case R_390_20:		/* Direct 20 bit.  */

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		*(u32 *)loc &= 0xf00000ff;

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		*(u32 *)loc |= (val & 0xfff) << 16;	/* DL */

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		*(u32 *)loc |= (val & 0xff000) >> 4;	/* DH */

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		break;

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	case R_390_32:		/* Direct 32 bit.  */

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		*(u32 *)loc = val;

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		break;

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	case R_390_64:		/* Direct 64 bit.  */

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	case R_390_GLOB_DAT:

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	case R_390_JMP_SLOT:

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		*(u64 *)loc = val;

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		break;

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	case R_390_PC16:	/* PC relative 16 bit.	*/

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		*(u16 *)loc = (val - addr);

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		break;

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	case R_390_PC16DBL:	/* PC relative 16 bit shifted by 1.  */

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		*(u16 *)loc = (val - addr) >> 1;

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		break;

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	case R_390_PC32DBL:	/* PC relative 32 bit shifted by 1.  */

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		*(u32 *)loc = (val - addr) >> 1;

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		break;

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	case R_390_PC32:	/* PC relative 32 bit.	*/

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		*(u32 *)loc = (val - addr);

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		break;

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	case R_390_PC64:	/* PC relative 64 bit.	*/

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		*(u64 *)loc = (val - addr);

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		break;

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	case R_390_RELATIVE:

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		*(unsigned long *) loc = val;

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		break;

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	default:

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		return 1;

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	}

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	return 0;

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}

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