1 // SPDX-License-Identifier: BSD-3-Clause 2 /* 3 * reloc_ia32.c - position independent x86 ELF shared object relocator 4 * Copyright (C) 1999 Hewlett-Packard Co. 5 * Contributed by David Mosberger <davidm@hpl.hp.com>. 6 * 7 * All rights reserved. 8 */ 9 10 #include <common.h> 11 #include <efi.h> 12 #include <elf.h> 13 14 efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn) 15 { 16 long relsz = 0, relent = 0; 17 Elf32_Rel *rel = 0; 18 unsigned long *addr; 19 int i; 20 21 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 22 switch (dyn[i].d_tag) { 23 case DT_REL: 24 rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr + 25 ldbase); 26 break; 27 28 case DT_RELSZ: 29 relsz = dyn[i].d_un.d_val; 30 break; 31 32 case DT_RELENT: 33 relent = dyn[i].d_un.d_val; 34 break; 35 36 case DT_RELA: 37 break; 38 39 default: 40 break; 41 } 42 } 43 44 if (!rel && relent == 0) 45 return EFI_SUCCESS; 46 47 if (!rel || relent == 0) 48 return EFI_LOAD_ERROR; 49 50 while (relsz > 0) { 51 /* apply the relocs */ 52 switch (ELF32_R_TYPE(rel->r_info)) { 53 case R_386_NONE: 54 break; 55 56 case R_386_RELATIVE: 57 addr = (unsigned long *)(ldbase + rel->r_offset); 58 *addr += ldbase; 59 break; 60 61 default: 62 break; 63 } 64 rel = (Elf32_Rel *)((char *)rel + relent); 65 relsz -= relent; 66 } 67 68 return EFI_SUCCESS; 69 } 70