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      1 /* reloc_aarch64.c - position independent x86 ELF shared object relocator
      2    Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel (at) linaro.org>
      3    Copyright (C) 1999 Hewlett-Packard Co.
      4 	Contributed by David Mosberger <davidm (at) hpl.hp.com>.
      5 
      6     All rights reserved.
      7 
      8     Redistribution and use in source and binary forms, with or without
      9     modification, are permitted provided that the following conditions
     10     are met:
     11 
     12     * Redistributions of source code must retain the above copyright
     13       notice, this list of conditions and the following disclaimer.
     14     * Redistributions in binary form must reproduce the above
     15       copyright notice, this list of conditions and the following
     16       disclaimer in the documentation and/or other materials
     17       provided with the distribution.
     18     * Neither the name of Hewlett-Packard Co. nor the names of its
     19       contributors may be used to endorse or promote products derived
     20       from this software without specific prior written permission.
     21 
     22     THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
     23     CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
     24     INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     25     MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     26     DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
     27     BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
     28     OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     29     PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     30     PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     31     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
     32     TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
     33     THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34     SUCH DAMAGE.
     35 */
     36 
     37 #include <efi.h>
     38 
     39 #include <elf.h>
     40 
     41 efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image,
     42 		       struct efi_system_table *systab)
     43 {
     44 	long relsz = 0, relent = 0;
     45 	Elf64_Rela *rel = 0;
     46 	unsigned long *addr;
     47 	int i;
     48 
     49 	for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
     50 		switch (dyn[i].d_tag) {
     51 		case DT_RELA:
     52 			rel = (Elf64_Rela *)((ulong)dyn[i].d_un.d_ptr + ldbase);
     53 			break;
     54 		case DT_RELASZ:
     55 			relsz = dyn[i].d_un.d_val;
     56 			break;
     57 		case DT_RELAENT:
     58 			relent = dyn[i].d_un.d_val;
     59 			break;
     60 		default:
     61 			break;
     62 		}
     63 	}
     64 
     65 	if (!rel && relent == 0)
     66 		return EFI_SUCCESS;
     67 
     68 	if (!rel || relent == 0)
     69 		return EFI_LOAD_ERROR;
     70 
     71 	while (relsz > 0) {
     72 		/* apply the relocs */
     73 		switch (ELF64_R_TYPE(rel->r_info)) {
     74 		case R_AARCH64_NONE:
     75 			break;
     76 		case R_AARCH64_RELATIVE:
     77 			addr = (ulong *)(ldbase + rel->r_offset);
     78 			*addr = ldbase + rel->r_addend;
     79 			break;
     80 		default:
     81 			break;
     82 		}
     83 		rel = (Elf64_Rela *)((char *)rel + relent);
     84 		relsz -= relent;
     85 	}
     86 	return EFI_SUCCESS;
     87 }
     88