Commit 191590f0 authored by Peter Maydell's avatar Peter Maydell
Browse files

scripts/qemu-gdb: Split CoroutineCommand into its own file 



Split the implementation of CoroutineCommand into its own file.

Signed-off-by: default avatarPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Message-id: 1439574392-4403-3-git-send-email-peter.maydell@linaro.org
parent 93b1b365

scripts/qemu-gdb.py

+2 −76
Original line number Diff line number Diff line
@@ -23,66 +23,7 @@ import os, sys 


sys.path.append(os.path.dirname(__file__))



from qemugdb import mtree



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)

from qemugdb import mtree, coroutine



class QemuCommand(gdb.Command):

    '''Prefix for QEMU debug support commands'''
@@ -90,21 +31,6 @@ class QemuCommand(gdb.Command): 
        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'])



QemuCommand()

CoroutineCommand()

coroutine.CoroutineCommand()

mtree.MtreeCommand()

scripts/qemugdb/coroutine.py

0 → 100644
+91 −0
Original line number Diff line number Diff line 
#!/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'])