Add support for EFI apps on aarch64. This includes start-up and relocation code plus a link script.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v4: - Add new patch to add EFI app support on aarch64
Changes in v3: None Changes in v2: None
arch/arm/cpu/armv8/config.mk | 4 ++ arch/arm/lib/crt0_aarch64_efi.S | 135 +++++++++++++++++++++++++++++++++++++++ arch/arm/lib/elf_aarch64_efi.lds | 70 ++++++++++++++++++++ arch/arm/lib/reloc_aarch64_efi.c | 87 +++++++++++++++++++++++++ 4 files changed, 296 insertions(+) create mode 100644 arch/arm/lib/crt0_aarch64_efi.S create mode 100644 arch/arm/lib/elf_aarch64_efi.lds create mode 100644 arch/arm/lib/reloc_aarch64_efi.c
diff --git a/arch/arm/cpu/armv8/config.mk b/arch/arm/cpu/armv8/config.mk index 6850258..27b66d4 100644 --- a/arch/arm/cpu/armv8/config.mk +++ b/arch/arm/cpu/armv8/config.mk @@ -8,3 +8,7 @@ PLATFORM_RELFLAGS += -fno-common -ffixed-x18
PF_NO_UNALIGNED := $(call cc-option, -mstrict-align) PLATFORM_CPPFLAGS += $(PF_NO_UNALIGNED) + +EFI_LDS := elf_aarch64_efi.lds +EFI_CRT0 := crt0_aarch64_efi.o +EFI_RELOC := reloc_aarch64_efi.o diff --git a/arch/arm/lib/crt0_aarch64_efi.S b/arch/arm/lib/crt0_aarch64_efi.S new file mode 100644 index 0000000..5205646 --- /dev/null +++ b/arch/arm/lib/crt0_aarch64_efi.S @@ -0,0 +1,135 @@ +/* + * crt0-efi-aarch64.S - PE/COFF header for aarch64 EFI applications + * + * Copright (C) 2014 Linaro Ltd. ard.biesheuvel@linaro.org + * + * SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause + * + * This file is taken and modified from the gnu-efi project. + */ + + .section .text.head + + /* + * Magic "MZ" signature for PE/COFF + */ + .globl ImageBase +ImageBase: + .ascii "MZ" + .skip 58 /* 'MZ' + pad + offset == 64 */ + .long pe_header - ImageBase /* Offset to the PE header */ +pe_header: + .ascii "PE" + .short 0 +coff_header: + .short 0xaa64 /* AArch64 */ + .short 2 /* nr_sections */ + .long 0 /* TimeDateStamp */ + .long 0 /* PointerToSymbolTable */ + .long 1 /* NumberOfSymbols */ + .short section_table - optional_header /* SizeOfOptionalHeader */ + /* + * Characteristics: IMAGE_FILE_DEBUG_STRIPPED | + * IMAGE_FILE_EXECUTABLE_IMAGE | IMAGE_FILE_LINE_NUMS_STRIPPED + */ + .short 0x206 +optional_header: + .short 0x20b /* PE32+ format */ + .byte 0x02 /* MajorLinkerVersion */ + .byte 0x14 /* MinorLinkerVersion */ + .long _edata - _start /* SizeOfCode */ + .long 0 /* SizeOfInitializedData */ + .long 0 /* SizeOfUninitializedData */ + .long _start - ImageBase /* AddressOfEntryPoint */ + .long _start - ImageBase /* BaseOfCode */ + +extra_header_fields: + .quad 0 /* ImageBase */ + .long 0x20 /* SectionAlignment */ + .long 0x8 /* FileAlignment */ + .short 0 /* MajorOperatingSystemVersion */ + .short 0 /* MinorOperatingSystemVersion */ + .short 0 /* MajorImageVersion */ + .short 0 /* MinorImageVersion */ + .short 0 /* MajorSubsystemVersion */ + .short 0 /* MinorSubsystemVersion */ + .long 0 /* Win32VersionValue */ + + .long _edata - ImageBase /* SizeOfImage */ + + /* + * Everything before the kernel image is considered part of the header + */ + .long _start - ImageBase /* SizeOfHeaders */ + .long 0 /* CheckSum */ + .short EFI_SUBSYSTEM /* Subsystem */ + .short 0 /* DllCharacteristics */ + .quad 0 /* SizeOfStackReserve */ + .quad 0 /* SizeOfStackCommit */ + .quad 0 /* SizeOfHeapReserve */ + .quad 0 /* SizeOfHeapCommit */ + .long 0 /* LoaderFlags */ + .long 0x6 /* NumberOfRvaAndSizes */ + + .quad 0 /* ExportTable */ + .quad 0 /* ImportTable */ + .quad 0 /* ResourceTable */ + .quad 0 /* ExceptionTable */ + .quad 0 /* CertificationTable */ + .quad 0 /* BaseRelocationTable */ + + /* Section table */ +section_table: + + /* + * The EFI application loader requires a relocation section + * because EFI applications must be relocatable. This is a + * dummy section as far as we are concerned. + */ + .ascii ".reloc" + .byte 0 + .byte 0 /* end of 0 padding of section name */ + .long 0 + .long 0 + .long 0 /* SizeOfRawData */ + .long 0 /* PointerToRawData */ + .long 0 /* PointerToRelocations */ + .long 0 /* PointerToLineNumbers */ + .short 0 /* NumberOfRelocations */ + .short 0 /* NumberOfLineNumbers */ + .long 0x42100040 /* Characteristics (section flags) */ + + + .ascii ".text" + .byte 0 + .byte 0 + .byte 0 /* end of 0 padding of section name */ + .long _edata - _start /* VirtualSize */ + .long _start - ImageBase /* VirtualAddress */ + .long _edata - _start /* SizeOfRawData */ + .long _start - ImageBase /* PointerToRawData */ + + .long 0 /* PointerToRelocations (0 for executables) */ + .long 0 /* PointerToLineNumbers (0 for executables) */ + .short 0 /* NumberOfRelocations (0 for executables) */ + .short 0 /* NumberOfLineNumbers (0 for executables) */ + .long 0xe0500020 /* Characteristics (section flags) */ + +_start: + stp x29, x30, [sp, #-32]! + mov x29, sp + + stp x0, x1, [sp, #16] + mov x2, x0 + mov x3, x1 + adr x0, ImageBase + adrp x1, _DYNAMIC + add x1, x1, #:lo12:_DYNAMIC + bl _relocate + cbnz x0, 0f + + ldp x0, x1, [sp, #16] + bl efi_main + +0: ldp x29, x30, [sp], #32 + ret diff --git a/arch/arm/lib/elf_aarch64_efi.lds b/arch/arm/lib/elf_aarch64_efi.lds new file mode 100644 index 0000000..47cce1d --- /dev/null +++ b/arch/arm/lib/elf_aarch64_efi.lds @@ -0,0 +1,70 @@ +/* + * U-Boot aarch64 EFI linker script + * + * SPDX-License-Identifier: BSD-2-Clause + * + * Modified from elf_aarch64_efi.lds in gnu-efi + */ + +OUTPUT_FORMAT("elf64-littleaarch64", "elf64-littleaarch64", "elf64-littleaarch64") +OUTPUT_ARCH(aarch64) +ENTRY(_start) +SECTIONS +{ + .text 0x0 : { + _text = .; + *(.text.head) + *(.text) + *(.text.*) + *(.gnu.linkonce.t.*) + *(.srodata) + *(.rodata*) + . = ALIGN(16); + } + _etext = .; + _text_size = . - _text; + .dynamic : { *(.dynamic) } + .data : { + _data = .; + *(.sdata) + *(.data) + *(.data1) + *(.data.*) + *(.got.plt) + *(.got) + + /* + * The EFI loader doesn't seem to like a .bss section, so we + * stick it all into .data: + */ + . = ALIGN(16); + _bss = .; + *(.sbss) + *(.scommon) + *(.dynbss) + *(.bss) + *(.bss.*) + *(COMMON) + . = ALIGN(16); + _bss_end = .; + _edata = .; + } + .rela.dyn : { *(.rela.dyn) } + .rela.plt : { *(.rela.plt) } + .rela.got : { *(.rela.got) } + .rela.data : { *(.rela.data) *(.rela.data*) } + _data_size = . - _etext; + + . = ALIGN(4096); + .dynsym : { *(.dynsym) } + . = ALIGN(4096); + .dynstr : { *(.dynstr) } + . = ALIGN(4096); + .note.gnu.build-id : { *(.note.gnu.build-id) } + /DISCARD/ : { + *(.rel.reloc) + *(.eh_frame) + *(.note.GNU-stack) + } + .comment 0 : { *(.comment) } +} diff --git a/arch/arm/lib/reloc_aarch64_efi.c b/arch/arm/lib/reloc_aarch64_efi.c new file mode 100644 index 0000000..38c13d3 --- /dev/null +++ b/arch/arm/lib/reloc_aarch64_efi.c @@ -0,0 +1,87 @@ +/* reloc_aarch64.c - position independent x86 ELF shared object relocator + 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> + +efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t image, + struct efi_system_table *systab) +{ + long relsz = 0, relent = 0; + Elf64_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 = (Elf64_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 (ELF64_R_TYPE(rel->r_info)) { + case R_AARCH64_NONE: + break; + case R_AARCH64_RELATIVE: + addr = (ulong *)(ldbase + rel->r_offset); + *addr = ldbase + rel->r_addend; + break; + default: + break; + } + rel = (Elf64_Rela *)((char *)rel + relent); + relsz -= relent; + } + return EFI_SUCCESS; +}