make_fit_aft.py depends on the non-standard library pyelftools to pull out PT_LOAD segments from ELF files. However, this is as easy to do manually, without imposing the extra dependency on users.
Structures in the ELF file are unpacked into variables named to exactly match the ELF spec to ensure the destructuring code is reasonably self-documenting.
Signed-off-by: Chris Webb chris@arachsys.com --- arch/arm/mach-rockchip/make_fit_atf.py | 74 +++++++++++--------------- 1 file changed, 31 insertions(+), 43 deletions(-)
diff --git a/arch/arm/mach-rockchip/make_fit_atf.py b/arch/arm/mach-rockchip/make_fit_atf.py index db0ae96ca8..4b0acb8105 100755 --- a/arch/arm/mach-rockchip/make_fit_atf.py +++ b/arch/arm/mach-rockchip/make_fit_atf.py @@ -13,16 +13,7 @@ import os import sys import getopt import logging - -# pip install pyelftools -from elftools.elf.elffile import ELFFile - -ELF_SEG_P_TYPE = 'p_type' -ELF_SEG_P_PADDR = 'p_paddr' -ELF_SEG_P_VADDR = 'p_vaddr' -ELF_SEG_P_OFFSET = 'p_offset' -ELF_SEG_P_FILESZ = 'p_filesz' -ELF_SEG_P_MEMSZ = 'p_memsz' +import struct
DT_HEADER = """ /* @@ -118,33 +109,19 @@ def append_conf_node(file, dtbs, segments): file.write('\n')
def generate_atf_fit_dts_uboot(fit_file, uboot_file_name): - num_load_seg = 0 - p_paddr = 0xFFFFFFFF - with open(uboot_file_name, 'rb') as uboot_file: - uboot = ELFFile(uboot_file) - for i in range(uboot.num_segments()): - seg = uboot.get_segment(i) - if seg.__getitem__(ELF_SEG_P_TYPE) == 'PT_LOAD': - p_paddr = seg.__getitem__(ELF_SEG_P_PADDR) - num_load_seg = num_load_seg + 1 - - assert (p_paddr != 0xFFFFFFFF and num_load_seg == 1) - + segments = unpack_elf(uboot_file_name) + if len(segments) != 1: + raise ValueError("Invalid u-boot ELF image '%s'" % uboot_file_name) + entry, p_paddr, data = segments[0] fit_file.write(DT_UBOOT % p_paddr)
def generate_atf_fit_dts_bl31(fit_file, bl31_file_name, dtbs_file_name): - with open(bl31_file_name, 'rb') as bl31_file: - bl31 = ELFFile(bl31_file) - elf_entry = bl31.header['e_entry'] - segments = bl31.num_segments() - for i in range(segments): - seg = bl31.get_segment(i) - if seg.__getitem__(ELF_SEG_P_TYPE) == 'PT_LOAD': - paddr = seg.__getitem__(ELF_SEG_P_PADDR) - append_bl31_node(fit_file, i + 1, paddr, elf_entry) + segments = unpack_elf(bl31_file_name) + for i, (entry, paddr, data) in enumerate(segments): + append_bl31_node(fit_file, i + 1, paddr, entry) append_fdt_node(fit_file, dtbs_file_name) fit_file.write(DT_IMAGES_NODE_END) - append_conf_node(fit_file, dtbs_file_name, segments) + append_conf_node(fit_file, dtbs_file_name, len(segments))
def generate_atf_fit_dts(fit_file_name, bl31_file_name, uboot_file_name, dtbs_file_name): # Generate FIT script for ATF image. @@ -162,17 +139,28 @@ def generate_atf_fit_dts(fit_file_name, bl31_file_name, uboot_file_name, dtbs_fi fit_file.close()
def generate_atf_binary(bl31_file_name): - with open(bl31_file_name, 'rb') as bl31_file: - bl31 = ELFFile(bl31_file) - - num = bl31.num_segments() - for i in range(num): - seg = bl31.get_segment(i) - if seg.__getitem__(ELF_SEG_P_TYPE) == 'PT_LOAD': - paddr = seg.__getitem__(ELF_SEG_P_PADDR) - file_name = 'bl31_0x%08x.bin' % paddr - with open(file_name, "wb") as atf: - atf.write(seg.data()) + for entry, paddr, data in unpack_elf(bl31_file_name): + file_name = 'bl31_0x%08x.bin' % paddr + with open(file_name, "wb") as atf: + atf.write(data) + +def unpack_elf(filename): + with open(filename, 'rb') as file: + elf = file.read() + if elf[0:7] != b'\x7fELF\x02\x01\x01' or elf[18:20] != b'\xb7\x00': + raise ValueError("Invalid arm64 ELF file '%s'" % filename) + + e_entry, e_phoff = struct.unpack_from('<2Q', elf, 0x18) + e_phentsize, e_phnum = struct.unpack_from('<2H', elf, 0x36) + segments = [] + + for offset in range(e_phoff, e_phoff + e_phnum*e_phentsize, e_phentsize): + p_type, p_flags, p_offset = struct.unpack_from('<LLQ', elf, offset) + if p_type == 1: # PT_LOAD + p_paddr, p_filesz = struct.unpack_from('<2Q', elf, offset + 0x18) + p_data = elf[p_offset:p_offset + p_filesz] + segments.append((e_entry, p_paddr, p_data)) + return segments
def main(): uboot_elf = "./u-boot"