1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * reloc_ia32.c - position independent x86 ELF shared object relocator 3*4882a593Smuzhiyun * Copyright (C) 1999 Hewlett-Packard Co. 4*4882a593Smuzhiyun * Contributed by David Mosberger <davidm@hpl.hp.com>. 5*4882a593Smuzhiyun * 6*4882a593Smuzhiyun * All rights reserved. 7*4882a593Smuzhiyun * 8*4882a593Smuzhiyun * SPDX-License-Identifier: BSD-3-Clause 9*4882a593Smuzhiyun */ 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun #include <common.h> 12*4882a593Smuzhiyun #include <efi.h> 13*4882a593Smuzhiyun #include <elf.h> 14*4882a593Smuzhiyun #include <asm/elf.h> 15*4882a593Smuzhiyun _relocate(long ldbase,Elf32_Dyn * dyn,efi_handle_t image,struct efi_system_table * systab)16*4882a593Smuzhiyunefi_status_t _relocate(long ldbase, Elf32_Dyn *dyn, efi_handle_t image, 17*4882a593Smuzhiyun struct efi_system_table *systab) 18*4882a593Smuzhiyun { 19*4882a593Smuzhiyun long relsz = 0, relent = 0; 20*4882a593Smuzhiyun Elf32_Rel *rel = 0; 21*4882a593Smuzhiyun unsigned long *addr; 22*4882a593Smuzhiyun int i; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 25*4882a593Smuzhiyun switch (dyn[i].d_tag) { 26*4882a593Smuzhiyun case DT_REL: 27*4882a593Smuzhiyun rel = (Elf32_Rel *)((unsigned long)dyn[i].d_un.d_ptr + 28*4882a593Smuzhiyun ldbase); 29*4882a593Smuzhiyun break; 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun case DT_RELSZ: 32*4882a593Smuzhiyun relsz = dyn[i].d_un.d_val; 33*4882a593Smuzhiyun break; 34*4882a593Smuzhiyun 35*4882a593Smuzhiyun case DT_RELENT: 36*4882a593Smuzhiyun relent = dyn[i].d_un.d_val; 37*4882a593Smuzhiyun break; 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun case DT_RELA: 40*4882a593Smuzhiyun break; 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun default: 43*4882a593Smuzhiyun break; 44*4882a593Smuzhiyun } 45*4882a593Smuzhiyun } 46*4882a593Smuzhiyun 47*4882a593Smuzhiyun if (!rel && relent == 0) 48*4882a593Smuzhiyun return EFI_SUCCESS; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun if (!rel || relent == 0) 51*4882a593Smuzhiyun return EFI_LOAD_ERROR; 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun while (relsz > 0) { 54*4882a593Smuzhiyun /* apply the relocs */ 55*4882a593Smuzhiyun switch (ELF32_R_TYPE(rel->r_info)) { 56*4882a593Smuzhiyun case R_386_NONE: 57*4882a593Smuzhiyun break; 58*4882a593Smuzhiyun 59*4882a593Smuzhiyun case R_386_RELATIVE: 60*4882a593Smuzhiyun addr = (unsigned long *)(ldbase + rel->r_offset); 61*4882a593Smuzhiyun *addr += ldbase; 62*4882a593Smuzhiyun break; 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun default: 65*4882a593Smuzhiyun break; 66*4882a593Smuzhiyun } 67*4882a593Smuzhiyun rel = (Elf32_Rel *)((char *)rel + relent); 68*4882a593Smuzhiyun relsz -= relent; 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun 71*4882a593Smuzhiyun return EFI_SUCCESS; 72*4882a593Smuzhiyun } 73