--- /dev/null
+#!/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
+
+def isnull(ptr):
+ return ptr == gdb.Value(0).cast(ptr.type)
+
+def int128(p):
+ return long(p['lo']) + (long(p['hi']) << 64)
+
+def get_fs_base():
+ '''Fetch %fs base value using arch_prctl(ARCH_GET_FS)'''
+ # %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*)($rsp - 120) = %s' % old, False, True)
+ return fs_base
+
+def get_glibc_pointer_guard():
+ '''Fetch glibc pointer guard value'''
+ fs_base = get_fs_base()
+ return gdb.parse_and_eval('*(uint64_t*)((uint64_t)%s + 0x30)' % fs_base)
+
+def glibc_ptr_demangle(val, pointer_guard):
+ '''Undo effect of glibc's PTR_MANGLE()'''
+ return gdb.parse_and_eval('(((uint64_t)%s >> 0x11) | ((uint64_t)%s << (64 - 0x11))) ^ (uint64_t)%s' % (val, val, pointer_guard))
+
+def bt_jmpbuf(jmpbuf):
+ '''Backtrace a jmpbuf'''
+ JB_RBX = 0
+ JB_RBP = 1
+ JB_R12 = 2
+ JB_R13 = 3
+ JB_R14 = 4
+ JB_R15 = 5
+ JB_RSP = 6
+ JB_PC = 7
+
+ old_rbx = gdb.parse_and_eval('(uint64_t)$rbx')
+ old_rbp = gdb.parse_and_eval('(uint64_t)$rbp')
+ old_rsp = gdb.parse_and_eval('(uint64_t)$rsp')
+ old_r12 = gdb.parse_and_eval('(uint64_t)$r12')
+ old_r13 = gdb.parse_and_eval('(uint64_t)$r13')
+ old_r14 = gdb.parse_and_eval('(uint64_t)$r14')
+ old_r15 = gdb.parse_and_eval('(uint64_t)$r15')
+ old_rip = gdb.parse_and_eval('(uint64_t)$rip')
+
+ pointer_guard = get_glibc_pointer_guard()
+ gdb.execute('set $rbx = %s' % jmpbuf[JB_RBX])
+ gdb.execute('set $rbp = %s' % glibc_ptr_demangle(jmpbuf[JB_RBP], pointer_guard))
+ gdb.execute('set $rsp = %s' % glibc_ptr_demangle(jmpbuf[JB_RSP], pointer_guard))
+ gdb.execute('set $r12 = %s' % jmpbuf[JB_R12])
+ gdb.execute('set $r13 = %s' % jmpbuf[JB_R13])
+ gdb.execute('set $r14 = %s' % jmpbuf[JB_R14])
+ gdb.execute('set $r15 = %s' % jmpbuf[JB_R15])
+ gdb.execute('set $rip = %s' % glibc_ptr_demangle(jmpbuf[JB_PC], pointer_guard))
+
+ gdb.execute('bt')
+
+ gdb.execute('set $rbx = %s' % old_rbx)
+ gdb.execute('set $rbp = %s' % old_rbp)
+ gdb.execute('set $rsp = %s' % old_rsp)
+ gdb.execute('set $r12 = %s' % old_r12)
+ gdb.execute('set $r13 = %s' % old_r13)
+ gdb.execute('set $r14 = %s' % old_r14)
+ gdb.execute('set $r15 = %s' % old_r15)
+ gdb.execute('set $rip = %s' % old_rip)
+
+class QemuCommand(gdb.Command):
+ '''Prefix for QEMU debug support commands'''
+ def __init__(self):
+ gdb.Command.__init__(self, 'qemu', gdb.COMMAND_DATA,
+ gdb.COMPLETE_NONE, True)
+
+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
+
+ coroutine_pointer = gdb.parse_and_eval(argv[0]).cast(gdb.lookup_type('CoroutineUContext').pointer())
+ bt_jmpbuf(coroutine_pointer['env']['__jmpbuf'])
+
+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 long(ptr) in self.seen:
+ continue
+ self.print_item(ptr)
+ def print_item(self, ptr, offset = gdb.Value(0), level = 0):
+ self.seen.add(long(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,
+ long(addr),
+ long(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']
+
+QemuCommand()
+CoroutineCommand()
+MtreeCommand()
Code Review / kvmfornfv.git / blobdiff