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Simon Glass9de37732022-03-04 08:43:07 -07001#!/usr/bin/env python3
2# SPDX-License-Identifier: GPL-2.0+
3
4"""Decode the evspy_info linker list in a U-Boot ELF image"""
5
6from argparse import ArgumentParser
7import os
8import re
9import struct
10import sys
11
12our_path = os.path.dirname(os.path.realpath(__file__))
13src_path = os.path.dirname(our_path)
14
15sys.path.insert(1, os.path.join(our_path, '../tools'))
16
17from binman import elf
Simon Glass4583c002023-02-23 18:18:04 -070018from u_boot_pylib import tools
Simon Glass9de37732022-03-04 08:43:07 -070019
Simon Glassb5001cb2022-09-06 20:26:56 -060020# A typical symbol looks like this:
21# _u_boot_list_2_evspy_info_2_EVT_MISC_INIT_F_3_sandbox_misc_init_f
Simon Glass9de37732022-03-04 08:43:07 -070022PREFIX = '_u_boot_list_2_evspy_info_2_'
Simon Glassb5001cb2022-09-06 20:26:56 -060023RE_EVTYPE = re.compile('%s(.*)_3_.*' % PREFIX)
Simon Glass9de37732022-03-04 08:43:07 -070024
25def show_sym(fname, data, endian, evtype, sym):
26 """Show information about an evspy entry
27
28 Args:
29 fname (str): Filename of ELF file
30 data (bytes): Data for this symbol
31 endian (str): Endianness to use ('little', 'big', 'auto')
32 evtype (str): Event type, e.g. 'MISC_INIT_F'
33 sym (elf.Symbol): Symbol to show
34 """
35 def _unpack_val(sym_data, offset):
36 start = offset * func_size
37 val_data = sym_data[start:start + func_size]
38 fmt = '%s%s' % ('>' if endian == 'big' else '<',
39 'L' if func_size == 4 else 'Q')
40 val = struct.unpack(fmt, val_data)[0]
41 return val
42
43 # Get the data, which is a struct evspy_info
44 sym_data = data[sym.offset:sym.offset + sym.size]
45
46 # Figure out the word size of the struct
47 func_size = 4 if sym.size < 16 else 8
48
49 # Read the function name for evspy_info->func
50 while True:
51 # Switch to big-endian if we see a failure
52 func_addr = _unpack_val(sym_data, 0)
53 func_name = elf.GetSymbolFromAddress(fname, func_addr)
54 if not func_name and endian == 'auto':
55 endian = 'big'
56 else:
57 break
58 has_id = sym.size in [12, 24]
59 if has_id:
60 # Find the address of evspy_info->id in the ELF
61 id_addr = _unpack_val(sym_data, 2)
62
63 # Get the file offset for that address
64 id_ofs = elf.GetFileOffset(fname, id_addr)
65
66 # Read out a nul-terminated string
67 id_data = data[id_ofs:id_ofs + 80]
68 pos = id_data.find(0)
69 if pos:
70 id_data = id_data[:pos]
71 id_str = id_data.decode('utf-8')
72 else:
73 id_str = None
74
75 # Find the file/line for the function
76 cmd = ['addr2line', '-e', fname, '%x' % func_addr]
77 out = tools.run(*cmd).strip()
78
79 # Drop the full path if it is the current directory
80 if out.startswith(src_path):
81 out = out[len(src_path) + 1:]
82 print('%-20s %-30s %s' % (evtype, id_str or f'f:{func_name}', out))
83
84def show_event_spy_list(fname, endian):
85 """Show a the event-spy- list from a U-Boot image
86
87 Args:
88 fname (str): Filename of ELF file
89 endian (str): Endianness to use ('little', 'big', 'auto')
90 """
91 syms = elf.GetSymbolFileOffset(fname, [PREFIX])
92 data = tools.read_file(fname)
93 print('%-20s %-30s %s' % ('Event type', 'Id', 'Source location'))
94 print('%-20s %-30s %s' % ('-' * 20, '-' * 30, '-' * 30))
95 for name, sym in syms.items():
96 m_evtype = RE_EVTYPE.search(name)
97 evtype = m_evtype .group(1)
98 show_sym(fname, data, endian, evtype, sym)
99
100def main(argv):
101 """Main program
102
103 Args:
104 argv (list of str): List of program arguments, excluding arvg[0]
105 """
106 epilog = 'Show a list of even spies in a U-Boot EFL file'
107 parser = ArgumentParser(epilog=epilog)
108 parser.add_argument('elf', type=str, help='ELF file to decode')
109 parser.add_argument('-e', '--endian', type=str, default='auto',
110 help='Big-endian image')
Simon Glass9de37732022-03-04 08:43:07 -0700111 args = parser.parse_args(argv)
112 show_event_spy_list(args.elf, args.endian)
113
114if __name__ == "__main__":
115 main(sys.argv[1:])