1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * reloc_x86_64.c - position independent x86_64 ELF shared object relocator 3*4882a593Smuzhiyun * Copyright (C) 1999 Hewlett-Packard Co. 4*4882a593Smuzhiyun * Contributed by David Mosberger <davidm@hpl.hp.com>. 5*4882a593Smuzhiyun * Copyright (C) 2005 Intel Co. 6*4882a593Smuzhiyun * Contributed by Fenghua Yu <fenghua.yu@intel.com>. 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * All rights reserved. 9*4882a593Smuzhiyun * 10*4882a593Smuzhiyun * SPDX-License-Identifier: BSD-3-Clause 11*4882a593Smuzhiyun */ 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun #include <common.h> 14*4882a593Smuzhiyun #include <efi.h> 15*4882a593Smuzhiyun #include <elf.h> 16*4882a593Smuzhiyun #include <asm/elf.h> 17*4882a593Smuzhiyun _relocate(long ldbase,Elf64_Dyn * dyn,efi_handle_t image,struct efi_system_table * systab)18*4882a593Smuzhiyunefi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image, 19*4882a593Smuzhiyun struct efi_system_table *systab) 20*4882a593Smuzhiyun { 21*4882a593Smuzhiyun long relsz = 0, relent = 0; 22*4882a593Smuzhiyun Elf64_Rel *rel = 0; 23*4882a593Smuzhiyun unsigned long *addr; 24*4882a593Smuzhiyun int i; 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 27*4882a593Smuzhiyun switch (dyn[i].d_tag) { 28*4882a593Smuzhiyun case DT_RELA: 29*4882a593Smuzhiyun rel = (Elf64_Rel *) 30*4882a593Smuzhiyun ((unsigned long)dyn[i].d_un.d_ptr + ldbase); 31*4882a593Smuzhiyun break; 32*4882a593Smuzhiyun case DT_RELASZ: 33*4882a593Smuzhiyun relsz = dyn[i].d_un.d_val; 34*4882a593Smuzhiyun break; 35*4882a593Smuzhiyun case DT_RELAENT: 36*4882a593Smuzhiyun relent = dyn[i].d_un.d_val; 37*4882a593Smuzhiyun break; 38*4882a593Smuzhiyun default: 39*4882a593Smuzhiyun break; 40*4882a593Smuzhiyun } 41*4882a593Smuzhiyun } 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun if (!rel && relent == 0) 44*4882a593Smuzhiyun return EFI_SUCCESS; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun if (!rel || relent == 0) 47*4882a593Smuzhiyun return EFI_LOAD_ERROR; 48*4882a593Smuzhiyun 49*4882a593Smuzhiyun while (relsz > 0) { 50*4882a593Smuzhiyun /* apply the relocs */ 51*4882a593Smuzhiyun switch (ELF64_R_TYPE(rel->r_info)) { 52*4882a593Smuzhiyun case R_X86_64_NONE: 53*4882a593Smuzhiyun break; 54*4882a593Smuzhiyun case R_X86_64_RELATIVE: 55*4882a593Smuzhiyun addr = (unsigned long *)(ldbase + rel->r_offset); 56*4882a593Smuzhiyun *addr += ldbase; 57*4882a593Smuzhiyun break; 58*4882a593Smuzhiyun default: 59*4882a593Smuzhiyun break; 60*4882a593Smuzhiyun } 61*4882a593Smuzhiyun rel = (Elf64_Rel *)((char *)rel + relent); 62*4882a593Smuzhiyun relsz -= relent; 63*4882a593Smuzhiyun } 64*4882a593Smuzhiyun 65*4882a593Smuzhiyun return EFI_SUCCESS; 66*4882a593Smuzhiyun } 67