@@ -17,6 +17,8 @@
import struct
+UINTPTR_T = gdb.lookup_type("uintptr_t")
+
TARGET_PAGE_SIZE = 0x1000
TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000
@@ -66,6 +68,94 @@ ELF64_PHDR = ("I" # p_type
"Q" # p_align
)
+def int128_get64(val):
+ assert (val["hi"] == 0)
+ return val["lo"]
+
+def qlist_foreach(head, field_str):
+ var_p = head["lh_first"]
+ while (var_p != 0):
+ var = var_p.dereference()
+ yield var
+ var_p = var[field_str]["le_next"]
+
+def qemu_get_ram_block(ram_addr):
+ ram_blocks = gdb.parse_and_eval("ram_list.blocks")
+ for block in qlist_foreach(ram_blocks, "next"):
+ if (ram_addr - block["offset"] < block["used_length"]):
+ return block
+ raise gdb.GdbError("Bad ram offset %x" % ram_addr)
+
+def qemu_get_ram_ptr(ram_addr):
+ block = qemu_get_ram_block(ram_addr)
+ return block["host"] + (ram_addr - block["offset"])
+
+def memory_region_get_ram_ptr(mr):
+ if (mr["alias"] != 0):
+ return (memory_region_get_ram_ptr(mr["alias"].dereference()) +
+ mr["alias_offset"])
+ return qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
+
+def get_guest_phys_blocks():
+ guest_phys_blocks = []
+ print "guest RAM blocks:"
+ print ("target_start target_end host_addr message "
+ "count")
+ print ("---------------- ---------------- ---------------- ------- "
+ "-----")
+
+ current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
+ current_map = current_map_p.dereference()
+ for cur in range(current_map["nr"]):
+ flat_range = (current_map["ranges"] + cur).dereference()
+ mr = flat_range["mr"].dereference()
+
+ # we only care about RAM
+ if (not mr["ram"]):
+ continue
+
+ section_size = int128_get64(flat_range["addr"]["size"])
+ target_start = int128_get64(flat_range["addr"]["start"])
+ target_end = target_start + section_size
+ host_addr = (memory_region_get_ram_ptr(mr) +
+ flat_range["offset_in_region"])
+ predecessor = None
+
+ # find continuity in guest physical address space
+ if (len(guest_phys_blocks) > 0):
+ predecessor = guest_phys_blocks[-1]
+ predecessor_size = (predecessor["target_end"] -
+ predecessor["target_start"])
+
+ # the memory API guarantees monotonically increasing
+ # traversal
+ assert (predecessor["target_end"] <= target_start)
+
+ # we want continuity in both guest-physical and
+ # host-virtual memory
+ if (predecessor["target_end"] < target_start or
+ predecessor["host_addr"] + predecessor_size != host_addr):
+ predecessor = None
+
+ if (predecessor is None):
+ # isolated mapping, add it to the list
+ guest_phys_blocks.append({"target_start": target_start,
+ "target_end" : target_end,
+ "host_addr" : host_addr})
+ message = "added"
+ else:
+ # expand predecessor until @target_end; predecessor's
+ # start doesn't change
+ predecessor["target_end"] = target_end
+ message = "joined"
+
+ print ("%016x %016x %016x %-7s %5u" %
+ (target_start, target_end, host_addr.cast(UINTPTR_T),
+ message, len(guest_phys_blocks)))
+
+ return guest_phys_blocks
+
+
class DumpGuestMemory(gdb.Command):
"""Extract guest vmcore from qemu process coredump.
@@ -100,96 +190,9 @@ shape and this command should mostly work."""
super(DumpGuestMemory, self).__init__("dump-guest-memory",
gdb.COMMAND_DATA,
gdb.COMPLETE_FILENAME)
- self.uintptr_t = gdb.lookup_type("uintptr_t")
self.elf64_ehdr_le = struct.Struct("<%s" % ELF64_EHDR)
self.elf64_phdr_le = struct.Struct("<%s" % ELF64_PHDR)
-
- def int128_get64(self, val):
- assert (val["hi"] == 0)
- return val["lo"]
-
- def qlist_foreach(self, head, field_str):
- var_p = head["lh_first"]
- while (var_p != 0):
- var = var_p.dereference()
- yield var
- var_p = var[field_str]["le_next"]
-
- def qemu_get_ram_block(self, ram_addr):
- ram_blocks = gdb.parse_and_eval("ram_list.blocks")
- for block in self.qlist_foreach(ram_blocks, "next"):
- if (ram_addr - block["offset"] < block["used_length"]):
- return block
- raise gdb.GdbError("Bad ram offset %x" % ram_addr)
-
- def qemu_get_ram_ptr(self, ram_addr):
- block = self.qemu_get_ram_block(ram_addr)
- return block["host"] + (ram_addr - block["offset"])
-
- def memory_region_get_ram_ptr(self, mr):
- if (mr["alias"] != 0):
- return (self.memory_region_get_ram_ptr(mr["alias"].dereference()) +
- mr["alias_offset"])
- return self.qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
-
- def guest_phys_blocks_init(self):
- self.guest_phys_blocks = []
-
- def guest_phys_blocks_append(self):
- print "guest RAM blocks:"
- print ("target_start target_end host_addr message "
- "count")
- print ("---------------- ---------------- ---------------- ------- "
- "-----")
-
- current_map_p = gdb.parse_and_eval("address_space_memory.current_map")
- current_map = current_map_p.dereference()
- for cur in range(current_map["nr"]):
- flat_range = (current_map["ranges"] + cur).dereference()
- mr = flat_range["mr"].dereference()
-
- # we only care about RAM
- if (not mr["ram"]):
- continue
-
- section_size = self.int128_get64(flat_range["addr"]["size"])
- target_start = self.int128_get64(flat_range["addr"]["start"])
- target_end = target_start + section_size
- host_addr = (self.memory_region_get_ram_ptr(mr) +
- flat_range["offset_in_region"])
- predecessor = None
-
- # find continuity in guest physical address space
- if (len(self.guest_phys_blocks) > 0):
- predecessor = self.guest_phys_blocks[-1]
- predecessor_size = (predecessor["target_end"] -
- predecessor["target_start"])
-
- # the memory API guarantees monotonically increasing
- # traversal
- assert (predecessor["target_end"] <= target_start)
-
- # we want continuity in both guest-physical and
- # host-virtual memory
- if (predecessor["target_end"] < target_start or
- predecessor["host_addr"] + predecessor_size != host_addr):
- predecessor = None
-
- if (predecessor is None):
- # isolated mapping, add it to the list
- self.guest_phys_blocks.append({"target_start": target_start,
- "target_end" : target_end,
- "host_addr" : host_addr})
- message = "added"
- else:
- # expand predecessor until @target_end; predecessor's
- # start doesn't change
- predecessor["target_end"] = target_end
- message = "joined"
-
- print ("%016x %016x %016x %-7s %5u" %
- (target_start, target_end, host_addr.cast(self.uintptr_t),
- message, len(self.guest_phys_blocks)))
+ self.guest_phys_blocks = None
def cpu_get_dump_info(self):
# We can't synchronize the registers with KVM post-mortem, and
@@ -263,8 +266,7 @@ shape and this command should mostly work."""
len(name) + 1, len(desc), type, name, desc)
def dump_init(self):
- self.guest_phys_blocks_init()
- self.guest_phys_blocks_append()
+ self.guest_phys_blocks = get_guest_phys_blocks()
self.cpu_get_dump_info()
# we have no way to retrieve the VCPU status from KVM
# post-mortem
@@ -310,7 +312,7 @@ shape and this command should mostly work."""
cur = block["host_addr"]
left = block["target_end"] - block["target_start"]
print ("dumping range at %016x for length %016x" %
- (cur.cast(self.uintptr_t), left))
+ (cur.cast(UINTPTR_T), left))
while (left > 0):
chunk_size = min(TARGET_PAGE_SIZE, left)
chunk = qemu_core.read_memory(cur, chunk_size)