Add support for EFI apps on ARM. This includes start-up and relocation code, plus a link script and some compiler setting changes. Signed-off-by: Simon Glass <sjg@chromium.org> [agraf: Remove whitespace change, add kconfig dep] Signed-off-by: Alexander Graf <agraf@suse.de>master
Simon Glass
8 years ago
committed by
Alexander Graf
parent
c70f74a081
commit
dd46eef2f6
@ -0,0 +1,138 @@ |
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/* |
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* crt0-efi-arm.S - PE/COFF header for ARM EFI applications |
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* |
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* Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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* |
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* SPDX-License-Identifier: GPL-2.0+ BSD-2-Clause |
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* |
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* This file is taken and modified from the gnu-efi project. |
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*/ |
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.section .text.head |
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/* |
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* Magic "MZ" signature for PE/COFF |
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*/ |
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.globl image_base
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image_base: |
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.ascii "MZ" |
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.skip 58 /* 'MZ' + pad + offset == 64 */ |
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.long pe_header - image_base /* Offset to the PE header */ |
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pe_header: |
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.ascii "PE" |
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.short 0
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coff_header: |
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.short 0x1c2 /* Mixed ARM/Thumb */ |
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.short 2 /* nr_sections */ |
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.long 0 /* TimeDateStamp */ |
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.long 0 /* PointerToSymbolTable */ |
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.long 1 /* NumberOfSymbols */ |
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.short section_table - optional_header /* SizeOfOptionalHeader */ |
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/* |
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* Characteristics: IMAGE_FILE_32BIT_MACHINE | |
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* IMAGE_FILE_DEBUG_STRIPPED | IMAGE_FILE_EXECUTABLE_IMAGE | |
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* IMAGE_FILE_LINE_NUMS_STRIPPED |
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*/ |
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.short 0x306
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optional_header: |
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.short 0x10b /* PE32+ format */ |
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.byte 0x02 /* MajorLinkerVersion */ |
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.byte 0x14 /* MinorLinkerVersion */ |
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.long _edata - _start /* SizeOfCode */ |
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.long 0 /* SizeOfInitializedData */ |
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.long 0 /* SizeOfUninitializedData */ |
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.long _start - image_base /* AddressOfEntryPoint */ |
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.long _start - image_base /* BaseOfCode */ |
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.long 0 /* BaseOfData */ |
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extra_header_fields: |
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.long 0 /* image_base */ |
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.long 0x20 /* SectionAlignment */ |
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.long 0x8 /* FileAlignment */ |
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.short 0 /* MajorOperatingSystemVersion */ |
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.short 0 /* MinorOperatingSystemVersion */ |
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.short 0 /* MajorImageVersion */ |
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.short 0 /* MinorImageVersion */ |
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.short 0 /* MajorSubsystemVersion */ |
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.short 0 /* MinorSubsystemVersion */ |
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.long 0 /* Win32VersionValue */ |
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.long _edata - image_base /* SizeOfImage */ |
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/* |
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* Everything before the kernel image is considered part of the header |
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*/ |
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.long _start - image_base /* SizeOfHeaders */ |
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.long 0 /* CheckSum */ |
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.short EFI_SUBSYSTEM /* Subsystem */ |
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.short 0 /* DllCharacteristics */ |
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.long 0 /* SizeOfStackReserve */ |
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.long 0 /* SizeOfStackCommit */ |
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.long 0 /* SizeOfHeapReserve */ |
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.long 0 /* SizeOfHeapCommit */ |
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.long 0 /* LoaderFlags */ |
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.long 0x6 /* NumberOfRvaAndSizes */ |
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.quad 0 /* ExportTable */ |
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.quad 0 /* ImportTable */ |
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.quad 0 /* ResourceTable */ |
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.quad 0 /* ExceptionTable */ |
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.quad 0 /* CertificationTable */ |
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.quad 0 /* BaseRelocationTable */ |
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section_table: |
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/* |
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* The EFI application loader requires a relocation section |
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* because EFI applications must be relocatable. This is a |
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* dummy section as far as we are concerned. |
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*/ |
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.ascii ".reloc" |
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.byte 0
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.byte 0 /* end of 0 padding of section name */ |
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.long 0
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.long 0
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.long 0 /* SizeOfRawData */ |
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.long 0 /* PointerToRawData */ |
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.long 0 /* PointerToRelocations */ |
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.long 0 /* PointerToLineNumbers */ |
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.short 0 /* NumberOfRelocations */ |
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.short 0 /* NumberOfLineNumbers */ |
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.long 0x42100040 /* Characteristics (section flags) */ |
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.ascii ".text" |
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.byte 0
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.byte 0
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.byte 0 /* end of 0 padding of section name */ |
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.long _edata - _start /* VirtualSize */ |
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.long _start - image_base /* VirtualAddress */ |
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.long _edata - _start /* SizeOfRawData */ |
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.long _start - image_base /* PointerToRawData */ |
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.long 0 /* PointerToRelocations (0 for executables) */ |
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.long 0 /* PointerToLineNumbers (0 for executables) */ |
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.short 0 /* NumberOfRelocations (0 for executables) */ |
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.short 0 /* NumberOfLineNumbers (0 for executables) */ |
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.long 0xe0500020 /* Characteristics (section flags) */ |
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_start: |
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stmfd sp!, {r0-r2, lr} |
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mov r2, r0 |
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mov r3, r1 |
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adr r1, .L_DYNAMIC |
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ldr r0, [r1] |
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add r1, r0, r1 |
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adr r0, image_base |
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bl _relocate |
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teq r0, #0 |
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bne 0f |
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ldmfd sp, {r0-r1} |
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bl efi_main |
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0: add sp, sp, #12 |
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ldr pc, [sp], #4 |
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.L_DYNAMIC: |
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.word _DYNAMIC - . |
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@ -0,0 +1,70 @@ |
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/* |
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* U-Boot ARM EFI linker script |
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* |
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* SPDX-License-Identifier: BSD-2-Clause |
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* |
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* Modified from elf_arm_efi.lds in gnu-efi |
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*/ |
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OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") |
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OUTPUT_ARCH(arm) |
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ENTRY(_start) |
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SECTIONS |
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{ |
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.text 0x0 : { |
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_text = .; |
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*(.text.head) |
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*(.text) |
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*(.text.*) |
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*(.gnu.linkonce.t.*) |
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*(.srodata) |
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*(.rodata*) |
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. = ALIGN(16); |
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} |
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_etext = .; |
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_text_size = . - _text; |
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.dynamic : { *(.dynamic) } |
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.data : { |
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_data = .; |
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*(.sdata) |
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*(.data) |
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*(.data1) |
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*(.data.*) |
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*(.got.plt) |
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*(.got) |
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/* |
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* The EFI loader doesn't seem to like a .bss section, so we |
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* stick it all into .data: |
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*/ |
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. = ALIGN(16); |
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_bss = .; |
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*(.sbss) |
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*(.scommon) |
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*(.dynbss) |
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*(.bss) |
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*(.bss.*) |
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*(COMMON) |
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. = ALIGN(16); |
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_bss_end = .; |
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_edata = .; |
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} |
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.rel.dyn : { *(.rel.dyn) } |
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.rel.plt : { *(.rel.plt) } |
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.rel.got : { *(.rel.got) } |
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.rel.data : { *(.rel.data) *(.rel.data*) } |
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_data_size = . - _etext; |
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. = ALIGN(4096); |
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.dynsym : { *(.dynsym) } |
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. = ALIGN(4096); |
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.dynstr : { *(.dynstr) } |
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. = ALIGN(4096); |
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.note.gnu.build-id : { *(.note.gnu.build-id) } |
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/DISCARD/ : { |
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*(.rel.reloc) |
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*(.eh_frame) |
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*(.note.GNU-stack) |
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} |
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.comment 0 : { *(.comment) } |
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} |
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@ -0,0 +1,66 @@ |
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/*
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* reloc_arm.c - position-independent ARM ELF shared object relocator |
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* |
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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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* |
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* All rights reserved. |
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* |
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* SPDX-License-Identifier: BSD-3-Clause |
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* |
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* This file is taken and modified from the gnu-efi project. |
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*/ |
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#include <efi.h> |
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#include <elf.h> |
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efi_status_t _relocate(long ldbase, Elf32_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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Elf32_Rel *rel = 0; |
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ulong *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_REL: |
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rel = (Elf32_Rel *)((ulong)dyn[i].d_un.d_ptr |
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+ ldbase); |
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break; |
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case DT_RELSZ: |
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relsz = dyn[i].d_un.d_val; |
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break; |
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case DT_RELENT: |
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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 (ELF32_R_TYPE(rel->r_info)) { |
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case R_ARM_NONE: |
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break; |
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case R_ARM_RELATIVE: |
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addr = (ulong *)(ldbase + rel->r_offset); |
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*addr += ldbase; |
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break; |
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default: |
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break; |
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} |
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rel = (Elf32_Rel *)((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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