1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * reloc_arm.c - position-independent ARM ELF shared object relocator 4 * 5 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 6 * Copyright (C) 1999 Hewlett-Packard Co. 7 * Contributed by David Mosberger <davidm@hpl.hp.com>. 8 * 9 * All rights reserved. 10 * 11 * This file is taken and modified from the gnu-efi project. 12 */ 13 14 #include <efi.h> 15 #include <elf.h> 16 17 efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn) 18 { 19 long relsz = 0, relent = 0; 20 Elf32_Rel *rel = 0; 21 ulong *addr; 22 int i; 23 24 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 25 switch (dyn[i].d_tag) { 26 case DT_REL: 27 rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr 28 + ldbase); 29 break; 30 case DT_RELSZ: 31 relsz = dyn[i].d_un.d_val; 32 break; 33 case DT_RELENT: 34 relent = dyn[i].d_un.d_val; 35 break; 36 default: 37 break; 38 } 39 } 40 41 if (!rel && relent == 0) 42 return EFI_SUCCESS; 43 44 if (!rel || relent == 0) 45 return EFI_LOAD_ERROR; 46 47 while (relsz > 0) { 48 /* apply the relocs */ 49 switch (ELF32_R_TYPE(rel->r_info)) { 50 case R_ARM_NONE: 51 break; 52 case R_ARM_RELATIVE: 53 addr = (ulong *)(ldbase + rel->r_offset); 54 *addr += ldbase; 55 break; 56 default: 57 break; 58 } 59 rel = (Elf32_Rel *)((char *)rel + relent); 60 relsz -= relent; 61 } 62 63 return EFI_SUCCESS; 64 } 65