2018-05-29 06:10:06 +00:00
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// SPDX-License-Identifier: GPL-2.0+
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2018-04-23 05:59:45 +00:00
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/* reloc_riscv.c - position independent ELF shared object relocator
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Copyright (C) 2018 Alexander Graf <agraf@suse.de>
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Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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Copyright (C) 1999 Hewlett-Packard Co.
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Contributed by David Mosberger <davidm@hpl.hp.com>.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials
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provided with the distribution.
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* Neither the name of Hewlett-Packard Co. nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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BE LIABLE FOR ANYDIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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#include <efi.h>
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#include <elf.h>
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#if __riscv_xlen == 64
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#define Elf_Dyn Elf64_Dyn
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#define Elf_Rela Elf64_Rela
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#define ELF_R_TYPE ELF64_R_TYPE
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#else
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#define Elf_Dyn Elf32_Dyn
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#define Elf_Rela Elf32_Rela
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#define ELF_R_TYPE ELF32_R_TYPE
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#endif
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efi_status_t _relocate(long ldbase, Elf_Dyn *dyn, efi_handle_t image,
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struct efi_system_table *systab)
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{
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long relsz = 0, relent = 0;
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Elf_Rela *rel = 0;
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unsigned long *addr;
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int i;
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for (i = 0; dyn[i].d_tag != DT_NULL; ++i) {
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switch (dyn[i].d_tag) {
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case DT_RELA:
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rel = (Elf_Rela *)((ulong)dyn[i].d_un.d_ptr + ldbase);
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break;
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case DT_RELASZ:
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relsz = dyn[i].d_un.d_val;
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break;
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case DT_RELAENT:
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relent = dyn[i].d_un.d_val;
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break;
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default:
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break;
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}
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}
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if (!rel && relent == 0)
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return EFI_SUCCESS;
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if (!rel || relent == 0)
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return EFI_LOAD_ERROR;
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while (relsz > 0) {
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/* apply the relocs */
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switch (ELF_R_TYPE(rel->r_info)) {
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case R_RISCV_RELATIVE:
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addr = (ulong *)(ldbase + rel->r_offset);
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*addr = ldbase + rel->r_addend;
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break;
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default:
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/* Panic */
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while (1) ;
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}
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rel = (Elf_Rela *)((char *)rel + relent);
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relsz -= relent;
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}
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return EFI_SUCCESS;
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}
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