From: Paolo Bonzini <pbonz...@redhat.com>
Provide useful Python functions to reach and decipher a jmpbuf.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Message-id: 1444636974-19950-3-git-send-email-pbonz...@redhat.com
Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com>
---
scripts/qemugdb/coroutine.py | 56 +++++++++++++++++++++-----------------------
1 file changed, 27 insertions(+), 29 deletions(-)
diff --git a/scripts/qemugdb/coroutine.py b/scripts/qemugdb/coroutine.py
index b1d4546..b5c8678 100644
--- a/scripts/qemugdb/coroutine.py
+++ b/scripts/qemugdb/coroutine.py
@@ -47,8 +47,7 @@ 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'''
+def get_jmpbuf_regs(jmpbuf):
JB_RBX = 0
JB_RBP = 1
JB_R12 = 2
@@ -58,35 +57,35 @@ def bt_jmpbuf(jmpbuf):
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 $rip = %s' % glibc_ptr_demangle(jmpbuf[JB_PC],
pointer_guard))
+ return {'rbx': jmpbuf[JB_RBX],
+ 'rbp': glibc_ptr_demangle(jmpbuf[JB_RBP], pointer_guard),
+ 'rsp': glibc_ptr_demangle(jmpbuf[JB_RSP], pointer_guard),
+ 'r12': jmpbuf[JB_R12],
+ 'r13': jmpbuf[JB_R13],
+ 'r14': jmpbuf[JB_R14],
+ 'r15': jmpbuf[JB_R15],
+ 'rip': glibc_ptr_demangle(jmpbuf[JB_PC], pointer_guard) }
+
+def bt_jmpbuf(jmpbuf):
+ '''Backtrace a jmpbuf'''
+ regs = get_jmpbuf_regs(jmpbuf)
+ old = dict()
+
+ for i in regs:
+ old[i] = gdb.parse_and_eval('(uint64_t)$%s' % i)
+
+ for i in regs:
+ gdb.execute('set $%s = %s' % (i, regs[i]))
gdb.execute('bt')
- 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)
+ 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):
@@ -101,5 +100,4 @@ class CoroutineCommand(gdb.Command):
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'])
+ bt_jmpbuf(coroutine_to_jmpbuf(gdb.parse_and_eval(argv[0])))
--
2.4.3
