/* * reloc_arm.c - position-independent ARM ELF shared object relocator * * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> * Copyright (C) 1999 Hewlett-Packard Co. * Contributed by David Mosberger <davidm@hpl.hp.com>. * * All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause * * This file is taken and modified from the gnu-efi project. */ #include <efi.h> #include <elf.h> efi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image, struct efi_system_table *systab) { long relsz = 0, relent = 0; Elf32_Rel *rel = 0; ulong *addr; int i; for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { switch (dyn[i].d_tag) { case DT_REL: rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr + ldbase); break; case DT_RELSZ: relsz = dyn[i].d_un.d_val; break; case DT_RELENT: relent = dyn[i].d_un.d_val; break; default: break; } } if (!rel && relent == 0) return EFI_SUCCESS; if (!rel || relent == 0) return EFI_LOAD_ERROR; while (relsz > 0) { /* apply the relocs */ switch (ELF32_R_TYPE(rel->r_info)) { case R_ARM_NONE: break; case R_ARM_RELATIVE: addr = (ulong *)(ldbase + rel->r_offset); *addr += ldbase; break; default: break; } rel = (Elf32_Rel *)((char *)rel + relent); relsz -= relent; } return EFI_SUCCESS; }