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scripts/dump-guest-memory.py: Move constants to the top 

The constants bloated the class definition and were therefore moved to
the top.

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Message-Id: <1453464520-3882-2-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 13:08:35 +01:00 committed by Paolo Bonzini
parent e5f3e12e84
commit ca81ce72b4
1 changed files with 63 additions and 63 deletions
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126
scripts/dump-guest-memory.py
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@ -17,6 +17,55 @@
import struct
TARGET_PAGE_SIZE = 0x1000
TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000
# Various ELF constants
EM_X86_64 = 62 # AMD x86-64 target machine
ELFDATA2LSB = 1 # little endian
ELFCLASS64 = 2
ELFMAG = "\x7FELF"
EV_CURRENT = 1
ET_CORE = 4
PT_LOAD = 1
PT_NOTE = 4
# Special value for e_phnum. This indicates that the real number of
# program headers is too large to fit into e_phnum. Instead the real
# value is in the field sh_info of section 0.
PN_XNUM = 0xFFFF
# Format strings for packing and header size calculation.
ELF64_EHDR = ("4s" # e_ident/magic
"B" # e_ident/class
"B" # e_ident/data
"B" # e_ident/version
"B" # e_ident/osabi
"8s" # e_ident/pad
"H" # e_type
"H" # e_machine
"I" # e_version
"Q" # e_entry
"Q" # e_phoff
"Q" # e_shoff
"I" # e_flags
"H" # e_ehsize
"H" # e_phentsize
"H" # e_phnum
"H" # e_shentsize
"H" # e_shnum
"H" # e_shstrndx
)
ELF64_PHDR = ("I" # p_type
"I" # p_flags
"Q" # p_offset
"Q" # p_vaddr
"Q" # p_paddr
"Q" # p_filesz
"Q" # p_memsz
"Q" # p_align
)
class DumpGuestMemory(gdb.Command):
"""Extract guest vmcore from qemu process coredump.
@ -47,62 +96,13 @@ class DumpGuestMemory(gdb.Command):
a halfway fortunate point, then its coredump should be in reasonable
shape and this command should mostly work."""
TARGET_PAGE_SIZE = 0x1000
TARGET_PAGE_MASK = 0xFFFFFFFFFFFFF000
# Various ELF constants
EM_X86_64 = 62 # AMD x86-64 target machine
ELFDATA2LSB = 1 # little endian
ELFCLASS64 = 2
ELFMAG = "\x7FELF"
EV_CURRENT = 1
ET_CORE = 4
PT_LOAD = 1
PT_NOTE = 4
# Special value for e_phnum. This indicates that the real number of
# program headers is too large to fit into e_phnum. Instead the real
# value is in the field sh_info of section 0.
PN_XNUM = 0xFFFF
# Format strings for packing and header size calculation.
ELF64_EHDR = ("4s" # e_ident/magic
"B" # e_ident/class
"B" # e_ident/data
"B" # e_ident/version
"B" # e_ident/osabi
"8s" # e_ident/pad
"H" # e_type
"H" # e_machine
"I" # e_version
"Q" # e_entry
"Q" # e_phoff
"Q" # e_shoff
"I" # e_flags
"H" # e_ehsize
"H" # e_phentsize
"H" # e_phnum
"H" # e_shentsize
"H" # e_shnum
"H" # e_shstrndx
)
ELF64_PHDR = ("I" # p_type
"I" # p_flags
"Q" # p_offset
"Q" # p_vaddr
"Q" # p_paddr
"Q" # p_filesz
"Q" # p_memsz
"Q" # p_align
)
def __init__(self):
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" % self.ELF64_EHDR)
self.elf64_phdr_le = struct.Struct("<%s" % self.ELF64_PHDR)
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)
@ -130,7 +130,7 @@ 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"] & self.TARGET_PAGE_MASK)
return self.qemu_get_ram_ptr(mr["ram_addr"] & TARGET_PAGE_MASK)
def guest_phys_blocks_init(self):
self.guest_phys_blocks = []
@ -198,21 +198,21 @@ def cpu_get_dump_info(self):
# most common values. This also means that instruction pointer
# etc. will be bogus in the dump, but at least the RAM contents
# should be valid.
self.dump_info = {"d_machine": self.EM_X86_64,
"d_endian" : self.ELFDATA2LSB,
"d_class" : self.ELFCLASS64}
self.dump_info = {"d_machine": EM_X86_64,
"d_endian" : ELFDATA2LSB,
"d_class" : ELFCLASS64}
def encode_elf64_ehdr_le(self):
return self.elf64_ehdr_le.pack(
self.ELFMAG, # e_ident/magic
ELFMAG, # e_ident/magic
self.dump_info["d_class"], # e_ident/class
self.dump_info["d_endian"], # e_ident/data
self.EV_CURRENT, # e_ident/version
EV_CURRENT, # e_ident/version
0, # e_ident/osabi
"", # e_ident/pad
self.ET_CORE, # e_type
ET_CORE, # e_type
self.dump_info["d_machine"], # e_machine
self.EV_CURRENT, # e_version
EV_CURRENT, # e_version
0, # e_entry
self.elf64_ehdr_le.size, # e_phoff
0, # e_shoff
@ -226,7 +226,7 @@ def encode_elf64_ehdr_le(self):
)
def encode_elf64_note_le(self):
return self.elf64_phdr_le.pack(self.PT_NOTE, # p_type
return self.elf64_phdr_le.pack(PT_NOTE, # p_type
0, # p_flags
(self.memory_offset -
len(self.note)), # p_offset
@ -238,7 +238,7 @@ def encode_elf64_note_le(self):
)
def encode_elf64_load_le(self, offset, start_hwaddr, range_size):
return self.elf64_phdr_le.pack(self.PT_LOAD, # p_type
return self.elf64_phdr_le.pack(PT_LOAD, # p_type
0, # p_flags
offset, # p_offset
0, # p_vaddr
@ -276,7 +276,7 @@ def dump_init(self):
# 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 < self.PN_XNUM)
assert (self.phdr_num < PN_XNUM)
# Calculate the ELF file offset where the memory dump commences:
#
@ -312,7 +312,7 @@ def dump_iterate(self, vmcore):
print ("dumping range at %016x for length %016x" %
(cur.cast(self.uintptr_t), left))
while (left > 0):
chunk_size = min(self.TARGET_PAGE_SIZE, left)
chunk_size = min(TARGET_PAGE_SIZE, left)
chunk = qemu_core.read_memory(cur, chunk_size)
vmcore.write(chunk)
cur += chunk_size