1 /* reloc_ia32.c - position independent x86 ELF shared object relocator 2 Copyright (C) 1999 Hewlett-Packard Co. 3 Contributed by David Mosberger <davidm@hpl.hp.com>. 4 5 All rights reserved. 6 7 Redistribution and use in source and binary forms, with or without 8 modification, are permitted provided that the following conditions 9 are met: 10 11 * Redistributions of source code must retain the above copyright 12 notice, this list of conditions and the following disclaimer. 13 * Redistributions in binary form must reproduce the above 14 copyright notice, this list of conditions and the following 15 disclaimer in the documentation and/or other materials 16 provided with the distribution. 17 * Neither the name of Hewlett-Packard Co. nor the names of its 18 contributors may be used to endorse or promote products derived 19 from this software without specific prior written permission. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 22 CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 23 INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 24 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 25 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 26 BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 27 OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 31 TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 32 THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 SUCH DAMAGE. 34 */ 35 36 #include <efi.h> 37 #include <efilib.h> 38 39 #include <elf.h> 40 41 EFI_STATUS _relocate (long ldbase, Elf32_Dyn *dyn, 42 EFI_HANDLE image EFI_UNUSED, 43 EFI_SYSTEM_TABLE *systab EFI_UNUSED) 44 { 45 long relsz = 0, relent = 0; 46 Elf32_Rel *rel = 0; 47 unsigned long *addr; 48 int i; 49 50 for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { 51 switch (dyn[i].d_tag) { 52 case DT_REL: 53 rel = (Elf32_Rel*) 54 ((unsigned long)dyn[i].d_un.d_ptr 55 + ldbase); 56 break; 57 58 case DT_RELSZ: 59 relsz = dyn[i].d_un.d_val; 60 break; 61 62 case DT_RELENT: 63 relent = dyn[i].d_un.d_val; 64 break; 65 66 case DT_RELA: 67 break; 68 69 default: 70 break; 71 } 72 } 73 74 if (!rel && relent == 0) 75 return EFI_SUCCESS; 76 77 if (!rel || relent == 0) 78 return EFI_LOAD_ERROR; 79 80 while (relsz > 0) { 81 /* apply the relocs */ 82 switch (ELF32_R_TYPE (rel->r_info)) { 83 case R_386_NONE: 84 break; 85 86 case R_386_RELATIVE: 87 addr = (unsigned long *) 88 (ldbase + rel->r_offset); 89 *addr += ldbase; 90 break; 91 92 default: 93 break; 94 } 95 rel = (Elf32_Rel*) ((char *) rel + relent); 96 relsz -= relent; 97 } 98 return EFI_SUCCESS; 99 } 100