scripts/gdb/linux/cpus.py

Source file repositories/reference/linux-study-clean/scripts/gdb/linux/cpus.py

File Facts

System
Linux kernel
Corpus path
scripts/gdb/linux/cpus.py
Extension
.py
Size
6614 bytes
Lines
228
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: scripts
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#
# gdb helper commands and functions for Linux kernel debugging
#
#  per-cpu tools
#
# Copyright (c) Siemens AG, 2011-2013
#
# Authors:
#  Jan Kiszka <jan.kiszka@siemens.com>
#
# This work is licensed under the terms of the GNU GPL version 2.
#

import gdb

from linux import tasks, utils


task_type = utils.CachedType("struct task_struct")


MAX_CPUS = 4096


def get_current_cpu():
    if utils.get_gdbserver_type() == utils.GDBSERVER_QEMU:
        return gdb.selected_thread().num - 1
    elif utils.get_gdbserver_type() == utils.GDBSERVER_KGDB:
        return gdb.parse_and_eval("kgdb_active.counter")
    else:
        raise gdb.GdbError("Sorry, obtaining the current CPU is not yet "
                           "supported with this gdb server.")


def per_cpu(var_ptr, cpu):
    if cpu == -1:
        cpu = get_current_cpu()
    if utils.is_target_arch("sparc:v9"):
        offset = gdb.parse_and_eval(
            "trap_block[{0}].__per_cpu_base".format(str(cpu)))
    else:
        try:
            offset = gdb.parse_and_eval(
                "__per_cpu_offset[{0}]".format(str(cpu)))
        except gdb.error:
            # !CONFIG_SMP case
            offset = 0
    pointer = var_ptr.cast(utils.get_long_type()) + offset
    return pointer.cast(var_ptr.type)


cpu_mask = {}


def cpu_mask_invalidate(event):
    global cpu_mask
    cpu_mask = {}
    gdb.events.stop.disconnect(cpu_mask_invalidate)
    if hasattr(gdb.events, 'new_objfile'):
        gdb.events.new_objfile.disconnect(cpu_mask_invalidate)


def cpu_list(mask_name):
    global cpu_mask
    mask = None
    if mask_name in cpu_mask:
        mask = cpu_mask[mask_name]
    if mask is None:
        mask = gdb.parse_and_eval(mask_name + ".bits")
        if hasattr(gdb, 'events'):

Annotation

Implementation Notes