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      1 /*	$NetBSD: reloc_riscv64.c,v 1.2 2021/09/30 19:09:10 jmcneill Exp $	*/
      2 
      3 // SPDX-License-Identifier: GPL-2.0+
      4 /* reloc_riscv.c - position independent ELF shared object relocator
      5    Copyright (C) 2018 Alexander Graf <agraf (at) suse.de>
      6    Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel (at) linaro.org>
      7    Copyright (C) 1999 Hewlett-Packard Co.
      8 	Contributed by David Mosberger <davidm (at) hpl.hp.com>.
      9 
     10     All rights reserved.
     11 
     12     Redistribution and use in source and binary forms, with or without
     13     modification, are permitted provided that the following conditions
     14     are met:
     15 
     16     * Redistributions of source code must retain the above copyright
     17       notice, this list of conditions and the following disclaimer.
     18     * Redistributions in binary form must reproduce the above
     19       copyright notice, this list of conditions and the following
     20       disclaimer in the documentation and/or other materials
     21       provided with the distribution.
     22     * Neither the name of Hewlett-Packard Co. nor the names of its
     23       contributors may be used to endorse or promote products derived
     24       from this software without specific prior written permission.
     25 
     26     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
     27     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
     28     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     29     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     30     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
     31     BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     32     OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     33     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     34     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     35     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     36     TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     37     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38     SUCH DAMAGE.
     39 */
     40 
     41 #include <efi.h>
     42 
     43 #ifdef __NetBSD__
     44 #include <sys/types.h>
     45 #include <sys/exec_elf.h>
     46 #else
     47 #include <elf.h>
     48 #endif
     49 
     50 #define Elf_Dyn		Elf64_Dyn
     51 #define Elf_Rela	Elf64_Rela
     52 #define ELF_R_TYPE	ELF64_R_TYPE
     53 
     54 EFI_STATUS EFIAPI _relocate(long, Elf_Dyn *);
     55 
     56 EFI_STATUS EFIAPI _relocate(long ldbase, Elf_Dyn *dyn)
     57 {
     58 	long relsz = 0, relent = 0;
     59 	Elf_Rela *rel = NULL;
     60 	unsigned long *addr;
     61 	int i;
     62 
     63 	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
     64 		switch (dyn[i].d_tag) {
     65 		case DT_RELA:
     66 			rel = (Elf_Rela *)((unsigned long)dyn[i].d_un.d_ptr + ldbase);
     67 			break;
     68 		case DT_RELASZ:
     69 			relsz = dyn[i].d_un.d_val;
     70 			break;
     71 		case DT_RELAENT:
     72 			relent = dyn[i].d_un.d_val;
     73 			break;
     74 		default:
     75 			break;
     76 		}
     77 	}
     78 
     79 	if (!rel && relent == 0)
     80 		return EFI_SUCCESS;
     81 
     82 	if (!rel || relent == 0)
     83 		return EFI_LOAD_ERROR;
     84 
     85 	while (relsz > 0) {
     86 		/* apply the relocs */
     87 		switch (ELF_R_TYPE(rel->r_info)) {
     88 		case R_RISCV_RELATIVE:
     89 			addr = (unsigned long *)(ldbase + rel->r_offset);
     90 			*addr = ldbase + rel->r_addend;
     91 			break;
     92 		default:
     93 			/* Panic */
     94 			while (1) ;
     95 		}
     96 		rel = (Elf_Rela *)((char *)rel + relent);
     97 		relsz -= relent;
     98 	}
     99 	return EFI_SUCCESS;
    100 }
    101