1*dd46eef2SSimon Glass /* 2*dd46eef2SSimon Glass * reloc_arm.c - position-independent ARM ELF shared object relocator 3*dd46eef2SSimon Glass * 4*dd46eef2SSimon Glass * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> 5*dd46eef2SSimon Glass * Copyright (C) 1999 Hewlett-Packard Co. 6*dd46eef2SSimon Glass * Contributed by David Mosberger <davidm@hpl.hp.com>. 7*dd46eef2SSimon Glass * 8*dd46eef2SSimon Glass * All rights reserved. 9*dd46eef2SSimon Glass * 10*dd46eef2SSimon Glass * SPDX-License-Identifier: BSD-3-Clause 11*dd46eef2SSimon Glass * 12*dd46eef2SSimon Glass * This file is taken and modified from the gnu-efi project. 13*dd46eef2SSimon Glass */ 14*dd46eef2SSimon Glass 15*dd46eef2SSimon Glass #include <efi.h> 16*dd46eef2SSimon Glass #include <elf.h> 17*dd46eef2SSimon Glass _relocate(long ldbase,Elf32_Dyn * dyn,efi_handle_t image,struct efi_system_table * systab)18*dd46eef2SSimon Glassefi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image, 19*dd46eef2SSimon Glass struct efi_system_table *systab) 20*dd46eef2SSimon Glass { 21*dd46eef2SSimon Glass long relsz = 0, relent = 0; 22*dd46eef2SSimon Glass Elf32_Rel *rel = 0; 23*dd46eef2SSimon Glass ulong *addr; 24*dd46eef2SSimon Glass int i; 25*dd46eef2SSimon Glass 26*dd46eef2SSimon Glass for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 27*dd46eef2SSimon Glass switch (dyn[i].d_tag) { 28*dd46eef2SSimon Glass case DT_REL: 29*dd46eef2SSimon Glass rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr 30*dd46eef2SSimon Glass + ldbase); 31*dd46eef2SSimon Glass break; 32*dd46eef2SSimon Glass case DT_RELSZ: 33*dd46eef2SSimon Glass relsz = dyn[i].d_un.d_val; 34*dd46eef2SSimon Glass break; 35*dd46eef2SSimon Glass case DT_RELENT: 36*dd46eef2SSimon Glass relent = dyn[i].d_un.d_val; 37*dd46eef2SSimon Glass break; 38*dd46eef2SSimon Glass default: 39*dd46eef2SSimon Glass break; 40*dd46eef2SSimon Glass } 41*dd46eef2SSimon Glass } 42*dd46eef2SSimon Glass 43*dd46eef2SSimon Glass if (!rel && relent == 0) 44*dd46eef2SSimon Glass return EFI_SUCCESS; 45*dd46eef2SSimon Glass 46*dd46eef2SSimon Glass if (!rel || relent == 0) 47*dd46eef2SSimon Glass return EFI_LOAD_ERROR; 48*dd46eef2SSimon Glass 49*dd46eef2SSimon Glass while (relsz > 0) { 50*dd46eef2SSimon Glass /* apply the relocs */ 51*dd46eef2SSimon Glass switch (ELF32_R_TYPE(rel->r_info)) { 52*dd46eef2SSimon Glass case R_ARM_NONE: 53*dd46eef2SSimon Glass break; 54*dd46eef2SSimon Glass case R_ARM_RELATIVE: 55*dd46eef2SSimon Glass addr = (ulong *)(ldbase + rel->r_offset); 56*dd46eef2SSimon Glass *addr += ldbase; 57*dd46eef2SSimon Glass break; 58*dd46eef2SSimon Glass default: 59*dd46eef2SSimon Glass break; 60*dd46eef2SSimon Glass } 61*dd46eef2SSimon Glass rel = (Elf32_Rel *)((char *)rel + relent); 62*dd46eef2SSimon Glass relsz -= relent; 63*dd46eef2SSimon Glass } 64*dd46eef2SSimon Glass 65*dd46eef2SSimon Glass return EFI_SUCCESS; 66*dd46eef2SSimon Glass } 67