Viewing: machdep_table.py
"""
Provide access to machine-dependent data.
Copyright 2014, 2017 Cray Inc. All Rights Reserved
"""
from pykdump.API import *
import crashlib.cid
class MachDepInfo:
"""Provide access to the crash machdep_table.
The data is collected by parsing the output of the 'help -m' command.
"""
def __init__(self):
"""Extract machine-dependent data from crash.
Initialize the table of machine dependent information by parsing
the output of the 'help -m' command. This only extracts
selected data.
Each item extracted is made available as an instance attribute.
"""
# crash 'help -m' doesn't use prefixes on numbers, so we must
# know what number base is in use for each numeric field.
fieldBase = {
'bits' : 10, 'flags' : 16, 'hz' : 10, 'identity_map_base' : 16,
'kvbase' : 16, 'last_pgd_read' : 16, 'last_pmd_read' : 16,
'last_ptbl_read' : 16, 'machspec' : 16, 'max_physmem_bits' : 10,
'memsize' : 10, 'mhz' : 10, 'modules_vaddr' : 16, 'nr_irqs' : 10,
'page_offset' : 16, 'pagemask' : 16, 'pageshift' : 10,
'pagesize' : 10, 'pgd' : 16, 'pmd' : 16, 'ptbl' : 16,
'ptrs_per_pgd' : 10, 'section_size_bits' : 10,
'sections_per_root' : 10, 'stacksize' : 10, 'userspace_top' : 16,
'vmalloc_end' : 16, 'vmalloc_start_addr' : 16, 'vmemmap_end' : 16,
'vmemmap_vaddr' : 16
}
if sys_info.machine in ("x86_64", "k1om", "x86"):
# additional x86_64 fields:
# Attic: 'last_pml4_read': 16, 'last_umpl_read': 16,
# 'umpl': 16, 'pml4': 16
x86_64_fields = {
'irq_eframe_link' : 10, 'irqstack' : 16,
'page_protnone' : 16, 'phys_base' : 16,
'thread_return' : 16, 'vsyscall_page' : 16,
}
fieldBase.update(x86_64_fields)
elif sys_info.machine == 'aarch64':
# no additional aarch64 field yet
pass
else:
raise crashlib.cid.ParseError(
'Invalid machine type {0}.'.format(sys_info.machine))
expected_key_count = len(fieldBase)
for line in exec_crash_command('help -m').splitlines():
# crash> help -m
# flags: 30400209 (KSYMS_START|MACHDEP_BT_TEXT|VM_2_6_11|VMEMMAP|FRAMESIZE_DEBUG|FRAMEPOINTER)
# kvbase: ffff880000000000
# identity_map_base: ffff880000000000
# pagesize: 4096
# pageshift: 12
# pagemask: fffffffffffff000
# pageoffset: fff
# stacksize: 8192
# hz: 250
# mhz: 2599
# memsize: 68694994944 (0xffe8a7000)
# ...
#
# Only use the first value after the field name and
# only for selected fields.
parts = line.split()
if len(parts) < 2: continue
key = parts[0].rstrip(':')
base = fieldBase.get(key, None)
if base is not None:
self.__dict__[key] = int(parts[1], base)
# If some versions of crash or the kernel don't have all the
# fields, this check code may need to be removed or modified.
if len(self.__dict__.keys()) != expected_key_count:
raise crashlib.cid.ParseError(
'Expected {:d}, but parsed {:d} entries.'.format(
expected_key_count, len(self.__dict__.keys())))
# --------------------------------------------------------------------------
# Create a shared instances.
crashlib.cid.mdtbl = MachDepInfo()
