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-rw-r--r--qemu/scripts/qemugdb/__init__.py28
-rw-r--r--qemu/scripts/qemugdb/aio.py58
-rw-r--r--qemu/scripts/qemugdb/coroutine.py119
-rw-r--r--qemu/scripts/qemugdb/mtree.py82
4 files changed, 287 insertions, 0 deletions
diff --git a/qemu/scripts/qemugdb/__init__.py b/qemu/scripts/qemugdb/__init__.py
new file mode 100644
index 000000000..969f552b2
--- /dev/null
+++ b/qemu/scripts/qemugdb/__init__.py
@@ -0,0 +1,28 @@
+#!/usr/bin/python
+
+# GDB debugging support
+#
+# Copyright (c) 2015 Linaro Ltd
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, see
+# <http://www.gnu.org/licenses/gpl-2.0.html>
+#
+
+# We don't need to do anything in our init file currently.
+
+"""
+Support routines for debugging QEMU under GDB
+"""
+
+__license__ = "GPL version 2 or (at your option) any later version"
diff --git a/qemu/scripts/qemugdb/aio.py b/qemu/scripts/qemugdb/aio.py
new file mode 100644
index 000000000..2ba00c444
--- /dev/null
+++ b/qemu/scripts/qemugdb/aio.py
@@ -0,0 +1,58 @@
+#!/usr/bin/python
+
+# GDB debugging support: aio/iohandler debug
+#
+# Copyright (c) 2015 Red Hat, Inc.
+#
+# Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2 or
+# later. See the COPYING file in the top-level directory.
+#
+
+import gdb
+from qemugdb import coroutine
+
+def isnull(ptr):
+ return ptr == gdb.Value(0).cast(ptr.type)
+
+def dump_aiocontext(context, verbose):
+ '''Display a dump and backtrace for an aiocontext'''
+ cur = context['aio_handlers']['lh_first']
+ # Get pointers to functions we're going to process specially
+ sym_fd_coroutine_enter = gdb.parse_and_eval('fd_coroutine_enter')
+
+ while not isnull(cur):
+ entry = cur.dereference()
+ gdb.write('----\n%s\n' % entry)
+ if verbose and cur['io_read'] == sym_fd_coroutine_enter:
+ coptr = (cur['opaque'].cast(gdb.lookup_type('FDYieldUntilData').pointer()))['co']
+ coptr = coptr.cast(gdb.lookup_type('CoroutineUContext').pointer())
+ coroutine.bt_jmpbuf(coptr['env']['__jmpbuf'])
+ cur = cur['node']['le_next'];
+
+ gdb.write('----\n')
+
+class HandlersCommand(gdb.Command):
+ '''Display aio handlers'''
+ def __init__(self):
+ gdb.Command.__init__(self, 'qemu handlers', gdb.COMMAND_DATA,
+ gdb.COMPLETE_NONE)
+
+ def invoke(self, arg, from_tty):
+ verbose = False
+ argv = gdb.string_to_argv(arg)
+
+ if len(argv) > 0 and argv[0] == '--verbose':
+ verbose = True
+ argv.pop(0)
+
+ if len(argv) > 1:
+ gdb.write('usage: qemu handlers [--verbose] [handler]\n')
+ return
+
+ if len(argv) == 1:
+ handlers_name = argv[0]
+ else:
+ handlers_name = 'qemu_aio_context'
+ dump_aiocontext(gdb.parse_and_eval(handlers_name), verbose)
diff --git a/qemu/scripts/qemugdb/coroutine.py b/qemu/scripts/qemugdb/coroutine.py
new file mode 100644
index 000000000..ab699794a
--- /dev/null
+++ b/qemu/scripts/qemugdb/coroutine.py
@@ -0,0 +1,119 @@
+#!/usr/bin/python
+
+# GDB debugging support
+#
+# Copyright 2012 Red Hat, Inc. and/or its affiliates
+#
+# Authors:
+# Avi Kivity <avi@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2. See
+# the COPYING file in the top-level directory.
+#
+# Contributions after 2012-01-13 are licensed under the terms of the
+# GNU GPL, version 2 or (at your option) any later version.
+
+import gdb
+
+VOID_PTR = gdb.lookup_type('void').pointer()
+
+def get_fs_base():
+ '''Fetch %fs base value using arch_prctl(ARCH_GET_FS). This is
+ pthread_self().'''
+ # %rsp - 120 is scratch space according to the SystemV ABI
+ old = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)')
+ gdb.execute('call arch_prctl(0x1003, $rsp - 120)', False, True)
+ fs_base = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)')
+ gdb.execute('set *(uint64_t*)($rsp - 120) = %s' % old, False, True)
+ return fs_base
+
+def pthread_self():
+ '''Fetch pthread_self() from the glibc start_thread function.'''
+ f = gdb.newest_frame()
+ while f.name() != 'start_thread':
+ f = f.older()
+ if f is None:
+ return get_fs_base()
+
+ try:
+ return f.read_var("arg")
+ except ValueError:
+ return get_fs_base()
+
+def get_glibc_pointer_guard():
+ '''Fetch glibc pointer guard value'''
+ fs_base = pthread_self()
+ return gdb.parse_and_eval('*(uint64_t*)((uint64_t)%s + 0x30)' % fs_base)
+
+def glibc_ptr_demangle(val, pointer_guard):
+ '''Undo effect of glibc's PTR_MANGLE()'''
+ return gdb.parse_and_eval('(((uint64_t)%s >> 0x11) | ((uint64_t)%s << (64 - 0x11))) ^ (uint64_t)%s' % (val, val, pointer_guard))
+
+def get_jmpbuf_regs(jmpbuf):
+ JB_RBX = 0
+ JB_RBP = 1
+ JB_R12 = 2
+ JB_R13 = 3
+ JB_R14 = 4
+ JB_R15 = 5
+ JB_RSP = 6
+ JB_PC = 7
+
+ pointer_guard = get_glibc_pointer_guard()
+ return {'rbx': jmpbuf[JB_RBX],
+ 'rbp': glibc_ptr_demangle(jmpbuf[JB_RBP], pointer_guard),
+ 'rsp': glibc_ptr_demangle(jmpbuf[JB_RSP], pointer_guard),
+ 'r12': jmpbuf[JB_R12],
+ 'r13': jmpbuf[JB_R13],
+ 'r14': jmpbuf[JB_R14],
+ 'r15': jmpbuf[JB_R15],
+ 'rip': glibc_ptr_demangle(jmpbuf[JB_PC], pointer_guard) }
+
+def bt_jmpbuf(jmpbuf):
+ '''Backtrace a jmpbuf'''
+ regs = get_jmpbuf_regs(jmpbuf)
+ old = dict()
+
+ for i in regs:
+ old[i] = gdb.parse_and_eval('(uint64_t)$%s' % i)
+
+ for i in regs:
+ gdb.execute('set $%s = %s' % (i, regs[i]))
+
+ gdb.execute('bt')
+
+ for i in regs:
+ gdb.execute('set $%s = %s' % (i, old[i]))
+
+def coroutine_to_jmpbuf(co):
+ coroutine_pointer = co.cast(gdb.lookup_type('CoroutineUContext').pointer())
+ return coroutine_pointer['env']['__jmpbuf']
+
+
+class CoroutineCommand(gdb.Command):
+ '''Display coroutine backtrace'''
+ def __init__(self):
+ gdb.Command.__init__(self, 'qemu coroutine', gdb.COMMAND_DATA,
+ gdb.COMPLETE_NONE)
+
+ def invoke(self, arg, from_tty):
+ argv = gdb.string_to_argv(arg)
+ if len(argv) != 1:
+ gdb.write('usage: qemu coroutine <coroutine-pointer>\n')
+ return
+
+ bt_jmpbuf(coroutine_to_jmpbuf(gdb.parse_and_eval(argv[0])))
+
+class CoroutineSPFunction(gdb.Function):
+ def __init__(self):
+ gdb.Function.__init__(self, 'qemu_coroutine_sp')
+
+ def invoke(self, addr):
+ return get_jmpbuf_regs(coroutine_to_jmpbuf(addr))['rsp'].cast(VOID_PTR)
+
+class CoroutinePCFunction(gdb.Function):
+ def __init__(self):
+ gdb.Function.__init__(self, 'qemu_coroutine_pc')
+
+ def invoke(self, addr):
+ return get_jmpbuf_regs(coroutine_to_jmpbuf(addr))['rip'].cast(VOID_PTR)
diff --git a/qemu/scripts/qemugdb/mtree.py b/qemu/scripts/qemugdb/mtree.py
new file mode 100644
index 000000000..cc8131c2e
--- /dev/null
+++ b/qemu/scripts/qemugdb/mtree.py
@@ -0,0 +1,82 @@
+#!/usr/bin/python
+
+# GDB debugging support
+#
+# Copyright 2012 Red Hat, Inc. and/or its affiliates
+#
+# Authors:
+# Avi Kivity <avi@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2. See
+# the COPYING file in the top-level directory.
+#
+# Contributions after 2012-01-13 are licensed under the terms of the
+# GNU GPL, version 2 or (at your option) any later version.
+
+# 'qemu mtree' -- display the memory hierarchy
+
+import gdb
+
+def isnull(ptr):
+ return ptr == gdb.Value(0).cast(ptr.type)
+
+def int128(p):
+ return int(p['lo']) + (int(p['hi']) << 64)
+
+class MtreeCommand(gdb.Command):
+ '''Display the memory tree hierarchy'''
+ def __init__(self):
+ gdb.Command.__init__(self, 'qemu mtree', gdb.COMMAND_DATA,
+ gdb.COMPLETE_NONE)
+ self.queue = []
+ def invoke(self, arg, from_tty):
+ self.seen = set()
+ self.queue_root('address_space_memory')
+ self.queue_root('address_space_io')
+ self.process_queue()
+ def queue_root(self, varname):
+ ptr = gdb.parse_and_eval(varname)['root']
+ self.queue.append(ptr)
+ def process_queue(self):
+ while self.queue:
+ ptr = self.queue.pop(0)
+ if int(ptr) in self.seen:
+ continue
+ self.print_item(ptr)
+ def print_item(self, ptr, offset = gdb.Value(0), level = 0):
+ self.seen.add(int(ptr))
+ addr = ptr['addr']
+ addr += offset
+ size = int128(ptr['size'])
+ alias = ptr['alias']
+ klass = ''
+ if not isnull(alias):
+ klass = ' (alias)'
+ elif not isnull(ptr['ops']):
+ klass = ' (I/O)'
+ elif bool(ptr['ram']):
+ klass = ' (RAM)'
+ gdb.write('%s%016x-%016x %s%s (@ %s)\n'
+ % (' ' * level,
+ int(addr),
+ int(addr + (size - 1)),
+ ptr['name'].string(),
+ klass,
+ ptr,
+ ),
+ gdb.STDOUT)
+ if not isnull(alias):
+ gdb.write('%s alias: %s@%016x (@ %s)\n' %
+ (' ' * level,
+ alias['name'].string(),
+ ptr['alias_offset'],
+ alias,
+ ),
+ gdb.STDOUT)
+ self.queue.append(alias)
+ subregion = ptr['subregions']['tqh_first']
+ level += 1
+ while not isnull(subregion):
+ self.print_item(subregion, addr, level)
+ subregion = subregion['subregions_link']['tqe_next']
+