Add a link script and relocation code for building 64-bit EFI applications. This can be used for the EFI stub.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v2: None
arch/x86/lib/elf_x86_64_efi.lds | 3 ++ arch/x86/lib/reloc_x86_64.c | 90 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 93 insertions(+) create mode 100644 arch/x86/lib/reloc_x86_64.c
diff --git a/arch/x86/lib/elf_x86_64_efi.lds b/arch/x86/lib/elf_x86_64_efi.lds index 70c7c52..886ebef 100644 --- a/arch/x86/lib/elf_x86_64_efi.lds +++ b/arch/x86/lib/elf_x86_64_efi.lds @@ -54,6 +54,9 @@ SECTIONS *(SORT(.u_boot_list*)); . = ALIGN(8); *(.dtb*); + /* Keep U-Boot payload */ + . = ALIGN(8); + KEEP(*(.u_boot_bin.*)); }
. = ALIGN(4096); diff --git a/arch/x86/lib/reloc_x86_64.c b/arch/x86/lib/reloc_x86_64.c new file mode 100644 index 0000000..70a2b2a --- /dev/null +++ b/arch/x86/lib/reloc_x86_64.c @@ -0,0 +1,90 @@ +/* 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 <common.h> +#include <efi.h> +#include <elf.h> +#include <asm/elf.h> + +efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image, + struct efi_system_table *systab) +{ + long relsz = 0, relent = 0; + struct 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 = (struct 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 = (struct elf64_rel *)((char *)rel + relent); + relsz -= relent; + } + return EFI_SUCCESS; +}