mirror of https://gitee.com/openkylin/qemu.git
92 lines
3.2 KiB
Python
92 lines
3.2 KiB
Python
|
#!/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 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 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'])
|