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dump-guest-memory: more descriptive lookup_type failure

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We've seen a few reports of

 (gdb) source /usr/share/qemu-kvm/dump-guest-memory.py
 Traceback (most recent call last):
   File "/usr/share/qemu-kvm/dump-guest-memory.py", line 19, in <module>
     UINTPTR_T = gdb.lookup_type("uintptr_t")
 gdb.error: No type named uintptr_t.

This occurs when symbols haven't been loaded first, i.e. neither a
QEMU binary was loaded nor a QEMU process was attached first. Let's
better inform the user of how to fix the issue themselves in order
to avoid more reports.

Acked-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Signed-off-by: Andrew Jones <drjones@redhat.com>
Message-Id: <20180314153820.18426-1-drjones@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Tested-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Andrew Jones 2018-03-14 16:38:20 +01:00 committed by Marc-André Lureau
parent 0c33659d09
commit 4b17bc933f
1 changed files with 6 additions and 1 deletions
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7
scripts/dump-guest-memory.py
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@ -16,7 +16,12 @@ the COPYING file in the top-level directory.
import ctypes
import struct
UINTPTR_T = gdb.lookup_type("uintptr_t")
try:
UINTPTR_T = gdb.lookup_type("uintptr_t")
except Exception as inst:
raise gdb.GdbError("Symbols must be loaded prior to sourcing dump-guest-memory.\n"
"Symbols may be loaded by 'attach'ing a QEMU process id or by "
"'load'ing a QEMU binary.")
TARGET_PAGE_SIZE = 0x1000
TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000