| /* This file is copied from GNU-EFI/gnuefi/reloc_x86_64.c |
| |
| reloc_x86_64.c - position independent x86_64 ELF shared object relocator |
| Copyright (C) 1999 Hewlett-Packard Co. |
| Contributed by David Mosberger <davidm@hpl.hp.com>. |
| Copyright (C) 2005 Intel Co. |
| Contributed by Fenghua Yu <fenghua.yu@intel.com>. |
| |
| All rights reserved. |
| |
| Redistribution and use in source and binary forms, with or without |
| modification, are permitted provided that the following conditions |
| are met: |
| |
| * Redistributions of source code must retain the above copyright |
| notice, this list of conditions and the following disclaimer. |
| * Redistributions in binary form must reproduce the above |
| copyright notice, this list of conditions and the following |
| disclaimer in the documentation and/or other materials |
| provided with the distribution. |
| * Neither the name of Hewlett-Packard Co. nor the names of its |
| contributors may be used to endorse or promote products derived |
| from this software without specific prior written permission. |
| |
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS |
| BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, |
| OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR |
| TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF |
| THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| SUCH DAMAGE. |
| */ |
| |
| #include "efi.h" |
| #include <elf.h> |
| |
| efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t handle, efi_system_table_t *sys_tab) |
| { |
| long relsz = 0, relent = 0; |
| Elf64_Rel *rel = 0; |
| unsigned long *addr; |
| int i; |
| |
| for (i = 0; dyn[i].d_tag != DT_NULL; ++i) { |
| switch (dyn[i].d_tag) { |
| case DT_RELA: |
| rel = (Elf64_Rel*) |
| ((unsigned long)dyn[i].d_un.d_ptr |
| + ldbase); |
| break; |
| |
| case DT_RELASZ: |
| relsz = dyn[i].d_un.d_val; |
| break; |
| |
| case DT_RELAENT: |
| 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 (ELF64_R_TYPE (rel->r_info)) { |
| case R_X86_64_NONE: |
| break; |
| |
| case R_X86_64_RELATIVE: |
| addr = (unsigned long *) |
| (ldbase + rel->r_offset); |
| *addr += ldbase; |
| break; |
| |
| default: |
| break; |
| } |
| rel = (Elf64_Rel*) ((char *) rel + relent); |
| relsz -= relent; |
| } |
| return EFI_SUCCESS; |
| } |