1 /* reloc_x86_64.c - position independent x86_64 ELF shared object relocator 2 Copyright (C) 1999 Hewlett-Packard Co. 3 Contributed by David Mosberger <davidm@hpl.hp.com>. 4 Copyright (C) 2005 Intel Co. 5 Contributed by Fenghua Yu <fenghua.yu@intel.com>. 6 7 All rights reserved. 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions 11 are met: 12 13 * Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 * Redistributions in binary form must reproduce the above 16 copyright notice, this list of conditions and the following 17 disclaimer in the documentation and/or other materials 18 provided with the distribution. 19 * Neither the name of Hewlett-Packard Co. nor the names of its 20 contributors may be used to endorse or promote products derived 21 from this software without specific prior written permission. 22 23 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 24 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 25 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 26 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 27 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 28 BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 29 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 30 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 31 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 32 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 33 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 34 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 SUCH DAMAGE. 36 */ 37 38 #include <efi.h> 39 #include <efilib.h> 40 41 #include <elf.h> 42 43 EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn, 44 EFI_HANDLE image EFI_UNUSED, 45 EFI_SYSTEM_TABLE *systab EFI_UNUSED) 46 { 47 long relsz = 0, relent = 0; 48 Elf64_Rel *rel = 0; 49 unsigned long *addr; 50 int i; 51 52 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 53 switch (dyn[i].d_tag) { 54 case DT_RELA: 55 rel = (Elf64_Rel*) 56 ((unsigned long)dyn[i].d_un.d_ptr 57 + ldbase); 58 break; 59 60 case DT_RELASZ: 61 relsz = dyn[i].d_un.d_val; 62 break; 63 64 case DT_RELAENT: 65 relent = dyn[i].d_un.d_val; 66 break; 67 68 default: 69 break; 70 } 71 } 72 73 if (!rel && relent == 0) 74 return EFI_SUCCESS; 75 76 if (!rel || relent == 0) 77 return EFI_LOAD_ERROR; 78 79 while (relsz > 0) { 80 /* apply the relocs */ 81 switch (ELF64_R_TYPE (rel->r_info)) { 82 case R_X86_64_NONE: 83 break; 84 85 case R_X86_64_RELATIVE: 86 addr = (unsigned long *) 87 (ldbase + rel->r_offset); 88 *addr += ldbase; 89 break; 90 91 default: 92 break; 93 } 94 rel = (Elf64_Rel*) ((char *) rel + relent); 95 relsz -= relent; 96 } 97 return EFI_SUCCESS; 98 } 99