X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Fscripts%2Fqemu-gdb.py;h=b3f8e04f7797db4939692a427b28776ef97a0f65;hb=8131fe4accd335eb9b15ca0dd4a2e4a776ab9727;hp=6c7f4fbe53629bb451016f1a5f13651f52e3be3a;hpb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;p=kvmfornfv.git diff --git a/qemu/scripts/qemu-gdb.py b/qemu/scripts/qemu-gdb.py index 6c7f4fbe5..b3f8e04f7 100644 --- a/qemu/scripts/qemu-gdb.py +++ b/qemu/scripts/qemu-gdb.py @@ -13,73 +13,20 @@ # Contributions after 2012-01-13 are licensed under the terms of the # GNU GPL, version 2 or (at your option) any later version. +# Usage: +# At the (gdb) prompt, type "source scripts/qemu-gdb.py". +# "help qemu" should then list the supported QEMU debug support commands. import gdb -def isnull(ptr): - return ptr == gdb.Value(0).cast(ptr.type) +import os, sys -def int128(p): - return long(p['lo']) + (long(p['hi']) << 64) +# Annoyingly, gdb doesn't put the directory of scripts onto the +# module search path. Do it manually. -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*)($rsp - 120) = %s' % old, False, True) - return fs_base +sys.path.append(os.path.dirname(__file__)) -def get_glibc_pointer_guard(): - '''Fetch glibc pointer guard value''' - fs_base = get_fs_base() - return gdb.parse_and_eval('*(uint64_t*)((uint64_t)%s + 0x30)' % fs_base) - -def glibc_ptr_demangle(val, pointer_guard): - '''Undo effect of glibc's PTR_MANGLE()''' - return gdb.parse_and_eval('(((uint64_t)%s >> 0x11) | ((uint64_t)%s << (64 - 0x11))) ^ (uint64_t)%s' % (val, val, pointer_guard)) - -def bt_jmpbuf(jmpbuf): - '''Backtrace a jmpbuf''' - JB_RBX = 0 - JB_RBP = 1 - JB_R12 = 2 - JB_R13 = 3 - JB_R14 = 4 - JB_R15 = 5 - JB_RSP = 6 - JB_PC = 7 - - old_rbx = gdb.parse_and_eval('(uint64_t)$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 aio, mtree, coroutine class QemuCommand(gdb.Command): '''Prefix for QEMU debug support commands''' @@ -87,78 +34,14 @@ 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 \n') - return - - coroutine_pointer = gdb.parse_and_eval(argv[0]).cast(gdb.lookup_type('CoroutineUContext').pointer()) - bt_jmpbuf(coroutine_pointer['env']['__jmpbuf']) +QemuCommand() +coroutine.CoroutineCommand() +mtree.MtreeCommand() +aio.HandlersCommand() -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'] +coroutine.CoroutineSPFunction() +coroutine.CoroutinePCFunction() -QemuCommand() -CoroutineCommand() -MtreeCommand() +# Default to silently passing through SIGUSR1, because QEMU sends it +# to itself a lot. +gdb.execute('handle SIGUSR1 pass noprint nostop')