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c9f368b597
The IMAGE_DLLCHARACTERISTICS_NX_COMPAT flag marks an EFI binary where
the following conditions are met [1]:
* Executable and writable sections are separated.
* The application does not run self-modifying code.
* The application uses the EFI_MEMORY_ATTRIBUTE_PROTOCOL when loading
executable code.
* The application does not assume that all memory ranges are usable.
* The stack is not expected to be executable.
The only EFI binaries U-Boot provides that do not fulfill these
requirements are the EFI app and the EFI payload.
Once we have implemented separation of writable and executable memory in
U-Boot we can use the IMAGE_DLLCHARACTERISTICS_NX_COMPAT flag to decide
if we will load an EFI binary.
[1] New UEFI CA memory mitigation requirements for signing
https://techcommunity.microsoft.com/t5/hardware-dev-center/new-uefi-ca-memory-mitigation-requirements-for-signing/ba-p/3608714
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
201 lines
5.7 KiB
ArmAsm
201 lines
5.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* crt0-efi-riscv.S - PE/COFF header for RISC-V EFI applications
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*
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* Copright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
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* Copright (C) 2018 Alexander Graf <agraf@suse.de>
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*
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* This file is inspired by arch/arm/lib/crt0_aarch64_efi.S
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*/
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#include <asm-generic/pe.h>
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#if __riscv_xlen == 64
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#define SIZE_LONG 8
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#define SAVE_LONG(reg, idx) sd reg, (idx*SIZE_LONG)(sp)
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#define LOAD_LONG(reg, idx) ld reg, (idx*SIZE_LONG)(sp)
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#define PE_MACHINE IMAGE_FILE_MACHINE_RISCV64
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#define PE_MAGIC IMAGE_NT_OPTIONAL_HDR64_MAGIC
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#define IMG_CHARACTERISTICS \
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(IMAGE_FILE_EXECUTABLE_IMAGE | \
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IMAGE_FILE_LINE_NUMS_STRIPPED | \
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IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
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IMAGE_FILE_LARGE_ADDRESS_AWARE | \
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IMAGE_FILE_DEBUG_STRIPPED)
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#else
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#define SIZE_LONG 4
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#define SAVE_LONG(reg, idx) sw reg, (idx*SIZE_LONG)(sp)
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#define LOAD_LONG(reg, idx) lw reg, (idx*SIZE_LONG)(sp)
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#define PE_MACHINE IMAGE_FILE_MACHINE_RISCV32
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#define PE_MAGIC IMAGE_NT_OPTIONAL_HDR32_MAGIC
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#define IMG_CHARACTERISTICS \
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(IMAGE_FILE_EXECUTABLE_IMAGE | \
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IMAGE_FILE_LINE_NUMS_STRIPPED | \
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IMAGE_FILE_LOCAL_SYMS_STRIPPED | \
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IMAGE_FILE_DEBUG_STRIPPED)
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#endif
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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 ImageBase
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ImageBase:
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.short IMAGE_DOS_SIGNATURE /* 'MZ' */
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.skip 46 /* 'MZ' + pad + offset == 64 */
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.long 0x43534952 /* Linux magic "RISCV */
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.long 0x00000056
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.long 0x05435352 /* Linux magic2 "RSC\x05*/
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.long pe_header - ImageBase /* Offset to the PE header */
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pe_header:
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.long IMAGE_NT_SIGNATURE /* 'PE' */
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coff_header:
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.short PE_MACHINE /* RISC-V 64/32-bit */
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.short 3 /* nr_sections */
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.long 0 /* TimeDateStamp */
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.long 0 /* PointerToSymbolTable */
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.long 0 /* NumberOfSymbols */
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.short section_table - optional_header /* SizeOfOptionalHeader */
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.short IMG_CHARACTERISTICS /* Characteristics */
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optional_header:
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.short PE_MAGIC /* 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 - ImageBase /* AddressOfEntryPoint */
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.long _start - ImageBase /* BaseOfCode */
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#if __riscv_xlen == 32
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.long 0 /* BaseOfData */
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#endif
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extra_header_fields:
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#if __riscv_xlen == 32
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.long 0 /* ImageBase */
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#else
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.quad 0 /* ImageBase */
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#endif
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.long 0x200 /* SectionAlignment */
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.long 0x200 /* FileAlignment */
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.short 0 /* MajorOperatingSystemVersion */
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.short 0 /* MinorOperatingSystemVersion */
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.short 1 /* 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 - ImageBase /* 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 - ImageBase /* SizeOfHeaders */
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.long 0 /* CheckSum */
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.short IMAGE_SUBSYSTEM_EFI_APPLICATION /* Subsystem */
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#if CONFIG_VENDOR_EFI
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.short 0 /* DllCharacteristics */
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#else
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.short IMAGE_DLLCHARACTERISTICS_NX_COMPAT
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#endif
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#if __riscv_xlen == 32
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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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#else
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.quad 0 /* SizeOfStackReserve */
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.quad 0 /* SizeOfStackCommit */
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.quad 0 /* SizeOfHeapReserve */
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.quad 0 /* SizeOfHeapCommit */
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#endif
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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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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 _etext - _start /* VirtualSize */
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.long _start - ImageBase /* VirtualAddress */
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.long _etext - _start /* SizeOfRawData */
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.long _start - ImageBase /* 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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/* Characteristics (section flags) */
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.long (IMAGE_SCN_MEM_READ | \
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IMAGE_SCN_MEM_EXECUTE | \
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IMAGE_SCN_CNT_CODE)
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.ascii ".data"
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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 - _data /* VirtualSize */
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.long _data - ImageBase /* VirtualAddress */
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.long _edata - _data /* SizeOfRawData */
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.long _data - ImageBase /* 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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/* Characteristics (section flags) */
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.long (IMAGE_SCN_MEM_WRITE | \
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IMAGE_SCN_MEM_READ | \
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IMAGE_SCN_CNT_INITIALIZED_DATA)
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.align 12
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_start:
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addi sp, sp, -(SIZE_LONG * 3)
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SAVE_LONG(a0, 0)
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SAVE_LONG(a1, 1)
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SAVE_LONG(ra, 2)
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lla a0, ImageBase
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lla a1, _DYNAMIC
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call _relocate
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bne a0, zero, 0f
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LOAD_LONG(a1, 1)
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LOAD_LONG(a0, 0)
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call efi_main
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LOAD_LONG(ra, 2)
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0: addi sp, sp, (SIZE_LONG * 3)
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ret
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