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 #include <asm/elf.h> 14 15 efi_status_t EFIAPI _relocate(long ldbase, Elf32_Dyn *dyn) 16 { 17 long relsz = 0, relent = 0; 18 Elf32_Rel *rel = 0; 19 unsigned long *addr; 20 int i; 21 22 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 23 switch (dyn[i].d_tag) { 24 case DT_REL: 25 rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr + 26 ldbase); 27 break; 28 29 case DT_RELSZ: 30 relsz = dyn[i].d_un.d_val; 31 break; 32 33 case DT_RELENT: 34 relent = dyn[i].d_un.d_val; 35 break; 36 37 case DT_RELA: 38 break; 39 40 default: 41 break; 42 } 43 } 44 45 if (!rel && relent == 0) 46 return EFI_SUCCESS; 47 48 if (!rel || relent == 0) 49 return EFI_LOAD_ERROR; 50 51 while (relsz > 0) { 52 /* apply the relocs */ 53 switch (ELF32_R_TYPE(rel->r_info)) { 54 case R_386_NONE: 55 break; 56 57 case R_386_RELATIVE: 58 addr = (unsigned long *)(ldbase + rel->r_offset); 59 *addr += ldbase; 60 break; 61 62 default: 63 break; 64 } 65 rel = (Elf32_Rel *)((char *)rel + relent); 66 relsz -= relent; 67 } 68 69 return EFI_SUCCESS; 70 } 71