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scripts/dump-guest-memory.py: Cleanup functions

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Increase readability by adding newlines and comments, as well as
removing wrong whitespaces and C style braces around conditionals and
loops.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1453464520-3882-5-git-send-email-frankja@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Janosch Frank 2016-01-22 13:08:38 +01:00 committed by Paolo Bonzini
parent 7cb1089d5f
commit 6782c0e785
1 changed files with 50 additions and 25 deletions
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75
scripts/dump-guest-memory.py
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@ -69,35 +69,60 @@ ELF64_PHDR = ("I" # p_type
)
def int128_get64(val):
assert (val["hi"] == 0)
"""Returns low 64bit part of Int128 struct."""
assert val["hi"] == 0
return val["lo"]
def qlist_foreach(head, field_str):
"""Generator for qlists."""
var_p = head["lh_first"]
while (var_p != 0):
while var_p != 0:
var = var_p.dereference()
yield var
var_p = var[field_str]["le_next"]
yield var
def qemu_get_ram_block(ram_addr):
"""Returns the RAMBlock struct to which the given address belongs."""
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"]):
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):
"""Returns qemu vaddr for given guest physical address."""
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 memory_region_get_ram_ptr(memory_region):
if memory_region["alias"] != 0:
return (memory_region_get_ram_ptr(memory_region["alias"].dereference())
+ memory_region["alias_offset"])
return qemu_get_ram_ptr(memory_region["ram_addr"] & TARGET_PAGE_MASK)
def get_guest_phys_blocks():
"""Returns a list of ram blocks.
Each block entry contains:
'target_start': guest block phys start address
'target_end': guest block phys end address
'host_addr': qemu vaddr of the block's start
"""
guest_phys_blocks = []
print("guest RAM blocks:")
print("target_start target_end host_addr message "
"count")
@ -111,29 +136,29 @@ def get_guest_phys_blocks():
# compatibility. Otherwise range doesn't cast the value itself and
# breaks.
for cur in range(int(current_map["nr"])):
flat_range = (current_map["ranges"] + cur).dereference()
mr = flat_range["mr"].dereference()
flat_range = (current_map["ranges"] + cur).dereference()
memory_region = flat_range["mr"].dereference()
# we only care about RAM
if (not mr["ram"]):
if not memory_region["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"])
target_end = target_start + section_size
host_addr = (memory_region_get_ram_ptr(memory_region)
+ flat_range["offset_in_region"])
predecessor = None
# find continuity in guest physical address space
if (len(guest_phys_blocks) > 0):
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)
assert predecessor["target_end"] <= target_start
# we want continuity in both guest-physical and
# host-virtual memory
@ -141,11 +166,11 @@ def get_guest_phys_blocks():
predecessor["host_addr"] + predecessor_size != host_addr):
predecessor = None
if (predecessor is 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})
"target_end": target_end,
"host_addr": host_addr})
message = "added"
else:
# expand predecessor until @target_end; predecessor's
@ -282,7 +307,7 @@ shape and this command should mostly work."""
# We should never reach PN_XNUM for paging=false dumps: there's
# just a handful of discontiguous ranges after merging.
self.phdr_num += len(self.guest_phys_blocks)
assert (self.phdr_num < PN_XNUM)
assert self.phdr_num < PN_XNUM
# Calculate the ELF file offset where the memory dump commences:
#
@ -313,15 +338,15 @@ shape and this command should mostly work."""
def dump_iterate(self, vmcore):
qemu_core = gdb.inferiors()[0]
for block in self.guest_phys_blocks:
cur = block["host_addr"]
cur = block["host_addr"]
left = block["target_end"] - block["target_start"]
print("dumping range at %016x for length %016x" %
(cur.cast(UINTPTR_T), left))
while (left > 0):
while left > 0:
chunk_size = min(TARGET_PAGE_SIZE, left)
chunk = qemu_core.read_memory(cur, chunk_size)
vmcore.write(chunk)
cur += chunk_size
cur += chunk_size
left -= chunk_size
def create_vmcore(self, filename):
@ -336,7 +361,7 @@ shape and this command should mostly work."""
self.dont_repeat()
argv = gdb.string_to_argv(args)
if (len(argv) != 1):
if len(argv) != 1:
raise gdb.GdbError("usage: dump-guest-memory FILE")
self.dump_init()