mirror of
https://github.com/drasko/codezero.git
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121 lines
4.6 KiB
Python
Executable File
121 lines
4.6 KiB
Python
Executable File
#!/usr/bin/env python
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from aistruct import AIStruct
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import elf, sys
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from optparse import OptionParser
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from os import path
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class AfterBurner(AIStruct):
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def __init__(self, *args, **kwargs):
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AIStruct.__init__(self, AIStruct.SIZE32)
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self.setup(
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('UINT32', 'addr')
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)
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def __str__(self):
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return "0x%x" % self.ai.addr.get()
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def main():
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parser = OptionParser(add_help_option=False)
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parser.add_option("-h", "--file-header",
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action="store_true", dest="header", default=False,
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help="Display the ELF file header")
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parser.add_option("-l", "--program-headers",
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action="store_true", dest="program_headers", default=False,
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help="Display the program headers")
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parser.add_option("-S", "--section-headers",
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action="store_true", dest="section_headers", default=False,
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help="Display the section headers")
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parser.add_option("--afterburn",
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action="store_true", dest="afterburn", default=False,
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help="Display the afterburn relocations")
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parser.add_option("--first-free-page",
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action="store_true", dest="ffpage", default=False,
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help="Prints out (in .lds format) the address of the first free physical" + \
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"page after this image at load time. Using this information at link" + \
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"time, images can be compiled and linked consecutively and loaded in" + \
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"consecutive memory regions at load time.")
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parser.add_option("--lma-start-end", action="store_true", dest="lma_boundary", default=False,
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help="Prints out the start and end LMA boundaries of an image." + \
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"This is useful for autogenerating a structure for the microkernel" + \
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"to discover at run-time where svc tasks are loaded.")
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(options, args) = parser.parse_args()
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if len(args) != 1:
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parser.print_help()
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return
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elffile = elf.ElfFile.from_file(args[0])
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if options.header:
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print elffile.header
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if options.program_headers:
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print elffile.pheaders
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if options.section_headers:
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print elffile.sheaders
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if options.afterburn:
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burnheader = elffile.sheaders[".afterburn"]
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burns = burnheader.container(AfterBurner)
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print "There are %d afterburn entry points" % len(burns)
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print "Afterburn:"
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for burn in burns:
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print " ", burn
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if options.lma_boundary:
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paddr_first = 0
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paddr_start = 0
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paddr_end = 0
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for pheader in elffile.pheaders:
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x = pheader.ai
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if str(x.p_type) != "LOAD":
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continue
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# First time assign the first p_paddr.
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if paddr_first == 0:
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paddr_first = 1
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paddr_start = x.p_paddr.value
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# Then if new paddr is lesser, reassign start.
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if paddr_start > x.p_paddr.value:
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paddr_start = x.p_paddr.value
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# If end of segment is greater, reassign end.
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if paddr_end < x.p_paddr + x.p_memsz:
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paddr_end = x.p_paddr + x.p_memsz
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rest, image_name = path.split(args[0])
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if image_name[-4] == ".":
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image_name = image_name[:-4]
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print image_name
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print "image_start " + hex(paddr_start)[:-1]
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print "image_end " + hex(paddr_end)[:-1]
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if options.ffpage:
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paddr_max = 0
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p_align = 0
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for pheader in elffile.pheaders:
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x = pheader.ai
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if str(x.p_type) == "LOAD":
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paddr = x.p_paddr + x.p_memsz
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p_align = x.p_align
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if paddr > paddr_max:
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paddr_max = paddr
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print "/*\n" + \
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" * The next free p_align'ed LMA base address\n" + \
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" *\n" + \
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" * p_align = " + hex(p_align.value) + "\n" + \
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" *\n" + \
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" * Recap from ELF spec: p_align: Loadable process segments must have\n" + \
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" * congruent values for p_vaddr and p_offset, modulo the page size. \n" + \
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" * This member gives the value to which the segments are aligned in \n" + \
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" * memory and in the file. Values 0 and 1 mean that no alignment is \n" + \
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" * required. Otherwise, p_align should be a positive, integral power\n" + \
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" * of 2, and p_addr should equal p_offset, modulo p_align. \n" + \
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" * This essentially means next available address must be aligned at\n" + \
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" * p_align, rather than the page_size, which one (well, I) would \n" + \
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" * normally expect. \n" + \
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" */\n"
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paddr_aligned = paddr_max & ~(p_align.value - 1)
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if paddr_max & (p_align.value - 1):
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paddr_aligned += p_align.value
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print "physical_base = " + hex(paddr_aligned)[:-1] + ";"
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if __name__ == "__main__":
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main()
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