diff options
Diffstat (limited to 'arch/riscv/lib/reloc_riscv_efi.c')
| -rw-r--r-- | arch/riscv/lib/reloc_riscv_efi.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/riscv/lib/reloc_riscv_efi.c b/arch/riscv/lib/reloc_riscv_efi.c new file mode 100644 index 0000000000..8b4b2b1d8f --- /dev/null +++ b/arch/riscv/lib/reloc_riscv_efi.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* reloc_riscv.c - position independent ELF shared object relocator + Copyright (C) 2018 Alexander Graf <agraf@suse.de> + Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org> + Copyright (C) 1999 Hewlett-Packard Co. + Contributed by David Mosberger <davidm@hpl.hp.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> + +#if __riscv_xlen == 64 +#define Elf_Dyn Elf64_Dyn +#define Elf_Rela Elf64_Rela +#define ELF_R_TYPE ELF64_R_TYPE +#else +#define Elf_Dyn Elf32_Dyn +#define Elf_Rela Elf32_Rela +#define ELF_R_TYPE ELF32_R_TYPE +#endif + +efi_status_t _relocate(long ldbase, Elf_Dyn *dyn, efi_handle_t image, + struct efi_system_table *systab) +{ + long relsz = 0, relent = 0; + Elf_Rela *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 = (Elf_Rela *)((ulong)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 (ELF_R_TYPE(rel->r_info)) { + case R_RISCV_RELATIVE: + addr = (ulong *)(ldbase + rel->r_offset); + *addr = ldbase + rel->r_addend; + break; + default: + /* Panic */ + while (1) ; + } + rel = (Elf_Rela *)((char *)rel + relent); + relsz -= relent; + } + return EFI_SUCCESS; +} |