mirror of
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142 lines
5.0 KiB
Python
142 lines
5.0 KiB
Python
#!/usr/bin/python
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# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# Note: the no-value-for-parameter here is expected, as the click module
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# decorators modify function arguments which pylint doesn't know
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# pylint: disable=no-value-for-parameter
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"""
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A program to parse auxv (e.g. /proc/self/auxv).
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By default, current arch is assumed, but options can be used to override the
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endianness and word size.
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"""
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import struct
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import click
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# From /usr/include/elf.h
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AT_AUXV = {
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'AT_NULL' : 0, # End of vector
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'AT_IGNORE' : 1, # Entry should be ignored
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'AT_EXECFD' : 2, # File descriptor of program
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'AT_PHDR' : 3, # Program headers for program
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'AT_PHENT' : 4, # Size of program header entry
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'AT_PHNUM' : 5, # Number of program headers
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'AT_PAGESZ' : 6, # System page size
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'AT_BASE' : 7, # Base address of interpreter
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'AT_FLAGS' : 8, # Flags
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'AT_ENTRY' : 9, # Entry point of program
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'AT_NOTELF' : 10, # Program is not ELF
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'AT_UID' : 11, # Real uid
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'AT_EUID' : 12, # Effective uid
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'AT_GID' : 13, # Real gid
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'AT_EGID' : 14, # Effective gid
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'AT_CLKTCK' : 17, # Frequency of times()
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# Some more special a_type values describing the hardware.
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'AT_PLATFORM' : 15, # String identifying platform.
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'AT_HWCAP' : 16, # Machine-dependent hints about processor capabilities.
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# This entry gives some information about the FPU initialization performed by the kernel.
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'AT_FPUCW' : 18, # Used FPU control word.
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# Cache block sizes.
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'AT_DCACHEBSIZE' : 19, # Data cache block size.
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'AT_ICACHEBSIZE' : 20, # Instruction cache block size.
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'AT_UCACHEBSIZE' : 21, # Unified cache block size.
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# A special ignored value for PPC, used by the kernel to control the
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# interpretation of the AUXV. Must be > 16.
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'AT_IGNOREPPC' : 22, # Entry should be ignored.
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'AT_SECURE' : 23, # Boolean, was exec setuid-like?
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'AT_BASE_PLATFORM' : 24, # String identifying real platforms.
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'AT_RANDOM' : 25, # Address of 16 random bytes.
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'AT_HWCAP2' : 26, # More machine-dependent hints about processor capabilities.
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'AT_EXECFN' : 31, # Filename of executable.
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# Pointer to the global system page used for system calls and other nice things.
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'AT_SYSINFO' : 32,
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'AT_SYSINFO_EHDR' : 33,
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# Shapes of the caches. Bits 0-3 contains associativity; bits 4-7 contains
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# log2 of line size; mask those to get cache size.
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'AT_L1I_CACHESHAPE' : 34,
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'AT_L1D_CACHESHAPE' : 35,
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'AT_L2_CACHESHAPE' : 36,
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'AT_L3_CACHESHAPE' : 37,
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# Shapes of the caches, with more room to describe them.
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# GEOMETRY are comprised of cache line size in bytes in the bottom 16 bits
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# and the cache associativity in the next 16 bits.
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'AT_L1I_CACHESIZE' : 40,
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'AT_L1I_CACHEGEOMETRY' : 41,
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'AT_L1D_CACHESIZE' : 42,
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'AT_L1D_CACHEGEOMETRY' : 43,
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'AT_L2_CACHESIZE' : 44,
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'AT_L2_CACHEGEOMETRY' : 45,
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'AT_L3_CACHESIZE' : 46,
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'AT_L3_CACHEGEOMETRY' : 47,
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'AT_MINSIGSTKSZ' : 51, # Stack needed for signal delivery
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}
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AT_AUXV_NAMES = {v:k for k,v in AT_AUXV.items()}
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@click.command(help=__doc__)
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@click.option('-b', '--big-endian', 'endian',
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flag_value='>',
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help='Input is big-endian')
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@click.option('-l', '--little-endian', 'endian',
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flag_value='<',
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help='Input is little-endian')
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@click.option('-3', '--32', 'field_width',
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flag_value=32,
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help='Input is 32-bit')
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@click.option('-6', '--64', 'field_width',
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flag_value=64,
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help='Input is 64-bit')
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@click.argument('file',
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type=click.File(mode='rb'))
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def dump(endian, field_width, file):
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data = file.read()
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if field_width is None:
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field_width = struct.calcsize('P') * 8
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if endian is None:
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endian = '@'
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width = {32:'II', 64:'QQ'}[field_width]
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format_str = f'{endian}{width}'
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print(f'# {format_str=}')
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seen_null = False
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for item in struct.iter_unpack(format_str, data):
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key, val = item
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name = AT_AUXV_NAMES.get(key, f'unknown ({key})')
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if name.endswith(('UID', 'GID')):
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pref, fmt = '', 'd'
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else:
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pref, fmt = '0x', 'x'
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if seen_null:
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print('# trailing garbage after AT_NULL')
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print(f'{name:18} = {pref}{val:{fmt}}')
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if name == 'AT_NULL':
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seen_null = True
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if not seen_null:
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print('# array not terminated with AT_NULL')
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if __name__ == '__main__':
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dump()
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