2019-06-12 17:52:49 +00:00
|
|
|
==========
|
|
|
|
|
VMCOREINFO
|
|
|
|
|
==========
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
What is it?
|
|
|
|
|
===========
|
|
|
|
|
|
|
|
|
|
VMCOREINFO is a special ELF note section. It contains various
|
|
|
|
|
information from the kernel like structure size, page size, symbol
|
|
|
|
|
values, field offsets, etc. These data are packed into an ELF note
|
|
|
|
|
section and used by user-space tools like crash and makedumpfile to
|
|
|
|
|
analyze a kernel's memory layout.
|
|
|
|
|
|
|
|
|
|
Common variables
|
|
|
|
|
================
|
|
|
|
|
|
|
|
|
|
init_uts_ns.name.release
|
|
|
|
|
------------------------
|
|
|
|
|
|
|
|
|
|
The version of the Linux kernel. Used to find the corresponding source
|
|
|
|
|
code from which the kernel has been built. For example, crash uses it to
|
|
|
|
|
find the corresponding vmlinux in order to process vmcore.
|
|
|
|
|
|
|
|
|
|
PAGE_SIZE
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
The size of a page. It is the smallest unit of data used by the memory
|
|
|
|
|
management facilities. It is usually 4096 bytes of size and a page is
|
|
|
|
|
aligned on 4096 bytes. Used for computing page addresses.
|
|
|
|
|
|
|
|
|
|
init_uts_ns
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
The UTS namespace which is used to isolate two specific elements of the
|
|
|
|
|
system that relate to the uname(2) system call. It is named after the
|
|
|
|
|
data structure used to store information returned by the uname(2) system
|
|
|
|
|
call.
|
|
|
|
|
|
|
|
|
|
User-space tools can get the kernel name, host name, kernel release
|
|
|
|
|
number, kernel version, architecture name and OS type from it.
|
|
|
|
|
|
2020-12-16 04:45:31 +00:00
|
|
|
(uts_namespace, name)
|
|
|
|
|
---------------------
|
|
|
|
|
|
|
|
|
|
Offset of the name's member. Crash Utility and Makedumpfile get
|
|
|
|
|
the start address of the init_uts_ns.name from this.
|
|
|
|
|
|
2019-01-10 12:19:43 +00:00
|
|
|
node_online_map
|
|
|
|
|
---------------
|
|
|
|
|
|
|
|
|
|
An array node_states[N_ONLINE] which represents the set of online nodes
|
|
|
|
|
in a system, one bit position per node number. Used to keep track of
|
|
|
|
|
which nodes are in the system and online.
|
|
|
|
|
|
|
|
|
|
swapper_pg_dir
|
2019-06-12 17:52:49 +00:00
|
|
|
--------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
The global page directory pointer of the kernel. Used to translate
|
|
|
|
|
virtual to physical addresses.
|
|
|
|
|
|
|
|
|
|
_stext
|
|
|
|
|
------
|
|
|
|
|
|
|
|
|
|
Defines the beginning of the text section. In general, _stext indicates
|
|
|
|
|
the kernel start address. Used to convert a virtual address from the
|
|
|
|
|
direct kernel map to a physical address.
|
|
|
|
|
|
|
|
|
|
vmap_area_list
|
|
|
|
|
--------------
|
|
|
|
|
|
|
|
|
|
Stores the virtual area list. makedumpfile gets the vmalloc start value
|
|
|
|
|
from this variable and its value is necessary for vmalloc translation.
|
|
|
|
|
|
|
|
|
|
mem_map
|
|
|
|
|
-------
|
|
|
|
|
|
|
|
|
|
Physical addresses are translated to struct pages by treating them as
|
|
|
|
|
an index into the mem_map array. Right-shifting a physical address
|
|
|
|
|
PAGE_SHIFT bits converts it into a page frame number which is an index
|
|
|
|
|
into that mem_map array.
|
|
|
|
|
|
|
|
|
|
Used to map an address to the corresponding struct page.
|
|
|
|
|
|
|
|
|
|
contig_page_data
|
|
|
|
|
----------------
|
|
|
|
|
|
|
|
|
|
Makedumpfile gets the pglist_data structure from this symbol, which is
|
|
|
|
|
used to describe the memory layout.
|
|
|
|
|
|
|
|
|
|
User-space tools use this to exclude free pages when dumping memory.
|
|
|
|
|
|
|
|
|
|
mem_section|(mem_section, NR_SECTION_ROOTS)|(mem_section, section_mem_map)
|
|
|
|
|
--------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
The address of the mem_section array, its length, structure size, and
|
|
|
|
|
the section_mem_map offset.
|
|
|
|
|
|
|
|
|
|
It exists in the sparse memory mapping model, and it is also somewhat
|
|
|
|
|
similar to the mem_map variable, both of them are used to translate an
|
|
|
|
|
address.
|
|
|
|
|
|
2020-05-13 18:52:36 +00:00
|
|
|
MAX_PHYSMEM_BITS
|
|
|
|
|
----------------
|
|
|
|
|
|
|
|
|
|
Defines the maximum supported physical address space memory.
|
|
|
|
|
|
2019-01-10 12:19:43 +00:00
|
|
|
page
|
|
|
|
|
----
|
|
|
|
|
|
|
|
|
|
The size of a page structure. struct page is an important data structure
|
|
|
|
|
and it is widely used to compute contiguous memory.
|
|
|
|
|
|
|
|
|
|
pglist_data
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
The size of a pglist_data structure. This value is used to check if the
|
|
|
|
|
pglist_data structure is valid. It is also used for checking the memory
|
|
|
|
|
type.
|
|
|
|
|
|
|
|
|
|
zone
|
|
|
|
|
----
|
|
|
|
|
|
|
|
|
|
The size of a zone structure. This value is used to check if the zone
|
|
|
|
|
structure has been found. It is also used for excluding free pages.
|
|
|
|
|
|
|
|
|
|
free_area
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
The size of a free_area structure. It indicates whether the free_area
|
|
|
|
|
structure is valid or not. Useful when excluding free pages.
|
|
|
|
|
|
|
|
|
|
list_head
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
The size of a list_head structure. Used when iterating lists in a
|
|
|
|
|
post-mortem analysis session.
|
|
|
|
|
|
|
|
|
|
nodemask_t
|
|
|
|
|
----------
|
|
|
|
|
|
|
|
|
|
The size of a nodemask_t type. Used to compute the number of online
|
|
|
|
|
nodes.
|
|
|
|
|
|
2023-08-16 15:11:56 +00:00
|
|
|
(page, flags|_refcount|mapping|lru|_mapcount|private|compound_order|compound_head)
|
|
|
|
|
----------------------------------------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
User-space tools compute their values based on the offset of these
|
|
|
|
|
variables. The variables are used when excluding unnecessary pages.
|
|
|
|
|
|
2019-06-12 17:52:49 +00:00
|
|
|
(pglist_data, node_zones|nr_zones|node_mem_map|node_start_pfn|node_spanned_pages|node_id)
|
|
|
|
|
-----------------------------------------------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
On NUMA machines, each NUMA node has a pg_data_t to describe its memory
|
|
|
|
|
layout. On UMA machines there is a single pglist_data which describes the
|
|
|
|
|
whole memory.
|
|
|
|
|
|
|
|
|
|
These values are used to check the memory type and to compute the
|
|
|
|
|
virtual address for memory map.
|
|
|
|
|
|
|
|
|
|
(zone, free_area|vm_stat|spanned_pages)
|
|
|
|
|
---------------------------------------
|
|
|
|
|
|
|
|
|
|
Each node is divided into a number of blocks called zones which
|
|
|
|
|
represent ranges within memory. A zone is described by a structure zone.
|
|
|
|
|
|
|
|
|
|
User-space tools compute required values based on the offset of these
|
|
|
|
|
variables.
|
|
|
|
|
|
|
|
|
|
(free_area, free_list)
|
|
|
|
|
----------------------
|
|
|
|
|
|
|
|
|
|
Offset of the free_list's member. This value is used to compute the number
|
|
|
|
|
of free pages.
|
|
|
|
|
|
2023-12-28 14:47:03 +00:00
|
|
|
Each zone has a free_area structure array called free_area[NR_PAGE_ORDERS].
|
2019-01-10 12:19:43 +00:00
|
|
|
The free_list represents a linked list of free page blocks.
|
|
|
|
|
|
|
|
|
|
(list_head, next|prev)
|
|
|
|
|
----------------------
|
|
|
|
|
|
|
|
|
|
Offsets of the list_head's members. list_head is used to define a
|
|
|
|
|
circular linked list. User-space tools need these in order to traverse
|
|
|
|
|
lists.
|
|
|
|
|
|
|
|
|
|
(vmap_area, va_start|list)
|
|
|
|
|
--------------------------
|
|
|
|
|
|
|
|
|
|
Offsets of the vmap_area's members. They carry vmalloc-specific
|
|
|
|
|
information. Makedumpfile gets the start address of the vmalloc region
|
|
|
|
|
from this.
|
|
|
|
|
|
2023-12-28 14:47:03 +00:00
|
|
|
(zone.free_area, NR_PAGE_ORDERS)
|
|
|
|
|
--------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
Free areas descriptor. User-space tools use this value to iterate the
|
2023-12-28 14:47:04 +00:00
|
|
|
free_area ranges. NR_PAGE_ORDERS is used by the zone buddy allocator.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
prb
|
|
|
|
|
---
|
|
|
|
|
|
|
|
|
|
A pointer to the printk ringbuffer (struct printk_ringbuffer). This
|
|
|
|
|
may be pointing to the static boot ringbuffer or the dynamically
|
2022-08-27 14:53:59 +00:00
|
|
|
allocated ringbuffer, depending on when the core dump occurred.
|
2020-08-14 21:33:16 +00:00
|
|
|
Used by user-space tools to read the active kernel log buffer.
|
|
|
|
|
|
|
|
|
|
printk_rb_static
|
|
|
|
|
----------------
|
|
|
|
|
|
|
|
|
|
A pointer to the static boot printk ringbuffer. If @prb has a
|
|
|
|
|
different value, this is useful for viewing the initial boot messages,
|
|
|
|
|
which may have been overwritten in the dynamically allocated
|
|
|
|
|
ringbuffer.
|
|
|
|
|
|
|
|
|
|
clear_seq
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
The sequence number of the printk() record after the last clear
|
|
|
|
|
command. It indicates the first record after the last
|
|
|
|
|
SYSLOG_ACTION_CLEAR, like issued by 'dmesg -c'. Used by user-space
|
|
|
|
|
tools to dump a subset of the dmesg log.
|
|
|
|
|
|
|
|
|
|
printk_ringbuffer
|
|
|
|
|
-----------------
|
|
|
|
|
|
|
|
|
|
The size of a printk_ringbuffer structure. This structure contains all
|
|
|
|
|
information required for accessing the various components of the
|
|
|
|
|
kernel log buffer.
|
|
|
|
|
|
|
|
|
|
(printk_ringbuffer, desc_ring|text_data_ring|dict_data_ring|fail)
|
|
|
|
|
-----------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
Offsets for the various components of the printk ringbuffer. Used by
|
|
|
|
|
user-space tools to view the kernel log buffer without requiring the
|
|
|
|
|
declaration of the structure.
|
|
|
|
|
|
|
|
|
|
prb_desc_ring
|
2019-01-10 12:19:43 +00:00
|
|
|
-------------
|
|
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
The size of the prb_desc_ring structure. This structure contains
|
|
|
|
|
information about the set of record descriptors.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
(prb_desc_ring, count_bits|descs|head_id|tail_id)
|
|
|
|
|
-------------------------------------------------
|
|
|
|
|
|
|
|
|
|
Offsets for the fields describing the set of record descriptors. Used
|
|
|
|
|
by user-space tools to be able to traverse the descriptors without
|
|
|
|
|
requiring the declaration of the structure.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
prb_desc
|
|
|
|
|
--------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
The size of the prb_desc structure. This structure contains
|
|
|
|
|
information about a single record descriptor.
|
|
|
|
|
|
|
|
|
|
(prb_desc, info|state_var|text_blk_lpos|dict_blk_lpos)
|
|
|
|
|
------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
Offsets for the fields describing a record descriptors. Used by
|
|
|
|
|
user-space tools to be able to read descriptors without requiring
|
|
|
|
|
the declaration of the structure.
|
|
|
|
|
|
|
|
|
|
prb_data_blk_lpos
|
|
|
|
|
-----------------
|
|
|
|
|
|
|
|
|
|
The size of the prb_data_blk_lpos structure. This structure contains
|
|
|
|
|
information about where the text or dictionary data (data block) is
|
|
|
|
|
located within the respective data ring.
|
|
|
|
|
|
|
|
|
|
(prb_data_blk_lpos, begin|next)
|
|
|
|
|
-------------------------------
|
|
|
|
|
|
|
|
|
|
Offsets for the fields describing the location of a data block. Used
|
|
|
|
|
by user-space tools to be able to locate data blocks without
|
|
|
|
|
requiring the declaration of the structure.
|
|
|
|
|
|
|
|
|
|
printk_info
|
2019-01-10 12:19:43 +00:00
|
|
|
-----------
|
|
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
The size of the printk_info structure. This structure contains all
|
|
|
|
|
the meta-data for a record.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
(printk_info, seq|ts_nsec|text_len|dict_len|caller_id)
|
|
|
|
|
------------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
Offsets for the fields providing the meta-data for a record. Used by
|
|
|
|
|
user-space tools to be able to read the information without requiring
|
|
|
|
|
the declaration of the structure.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
prb_data_ring
|
|
|
|
|
-------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
The size of the prb_data_ring structure. This structure contains
|
|
|
|
|
information about a set of data blocks.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
(prb_data_ring, size_bits|data|head_lpos|tail_lpos)
|
|
|
|
|
---------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
Offsets for the fields describing a set of data blocks. Used by
|
|
|
|
|
user-space tools to be able to access the data blocks without
|
|
|
|
|
requiring the declaration of the structure.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
atomic_long_t
|
|
|
|
|
-------------
|
|
|
|
|
|
|
|
|
|
The size of the atomic_long_t structure. Used by user-space tools to
|
|
|
|
|
be able to copy the full structure, regardless of its
|
|
|
|
|
architecture-specific implementation.
|
|
|
|
|
|
|
|
|
|
(atomic_long_t, counter)
|
|
|
|
|
------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
2020-08-14 21:33:16 +00:00
|
|
|
Offset for the long value of an atomic_long_t variable. Used by
|
|
|
|
|
user-space tools to access the long value without requiring the
|
|
|
|
|
architecture-specific declaration.
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
(free_area.free_list, MIGRATE_TYPES)
|
|
|
|
|
------------------------------------
|
|
|
|
|
|
|
|
|
|
The number of migrate types for pages. The free_list is described by the
|
|
|
|
|
array. Used by tools to compute the number of free pages.
|
|
|
|
|
|
|
|
|
|
NR_FREE_PAGES
|
|
|
|
|
-------------
|
|
|
|
|
|
|
|
|
|
On linux-2.6.21 or later, the number of free pages is in
|
|
|
|
|
vm_stat[NR_FREE_PAGES]. Used to get the number of free pages.
|
|
|
|
|
|
2023-08-16 15:11:55 +00:00
|
|
|
PG_lru|PG_private|PG_swapcache|PG_swapbacked|PG_slab|PG_hwpoision|PG_head_mask|PG_hugetlb
|
|
|
|
|
-----------------------------------------------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
Page attributes. These flags are used to filter various unnecessary for
|
|
|
|
|
dumping pages.
|
|
|
|
|
|
2019-06-12 17:52:49 +00:00
|
|
|
PAGE_BUDDY_MAPCOUNT_VALUE(~PG_buddy)|PAGE_OFFLINE_MAPCOUNT_VALUE(~PG_offline)
|
|
|
|
|
-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
More page attributes. These flags are used to filter various unnecessary for
|
|
|
|
|
dumping pages.
|
|
|
|
|
|
|
|
|
|
|
2019-01-10 12:19:43 +00:00
|
|
|
x86_64
|
|
|
|
|
======
|
|
|
|
|
|
|
|
|
|
phys_base
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
Used to convert the virtual address of an exported kernel symbol to its
|
|
|
|
|
corresponding physical address.
|
|
|
|
|
|
|
|
|
|
init_top_pgt
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
Used to walk through the whole page table and convert virtual addresses
|
|
|
|
|
to physical addresses. The init_top_pgt is somewhat similar to
|
|
|
|
|
swapper_pg_dir, but it is only used in x86_64.
|
|
|
|
|
|
|
|
|
|
pgtable_l5_enabled
|
|
|
|
|
------------------
|
|
|
|
|
|
|
|
|
|
User-space tools need to know whether the crash kernel was in 5-level
|
|
|
|
|
paging mode.
|
|
|
|
|
|
|
|
|
|
node_data
|
|
|
|
|
---------
|
|
|
|
|
|
|
|
|
|
This is a struct pglist_data array and stores all NUMA nodes
|
|
|
|
|
information. Makedumpfile gets the pglist_data structure from it.
|
|
|
|
|
|
|
|
|
|
(node_data, MAX_NUMNODES)
|
|
|
|
|
-------------------------
|
|
|
|
|
|
|
|
|
|
The maximum number of nodes in system.
|
|
|
|
|
|
|
|
|
|
KERNELOFFSET
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
The kernel randomization offset. Used to compute the page offset. If
|
|
|
|
|
KASLR is disabled, this value is zero.
|
|
|
|
|
|
|
|
|
|
KERNEL_IMAGE_SIZE
|
|
|
|
|
-----------------
|
|
|
|
|
|
|
|
|
|
Currently unused by Makedumpfile. Used to compute the module virtual
|
|
|
|
|
address by Crash.
|
|
|
|
|
|
|
|
|
|
sme_mask
|
|
|
|
|
--------
|
|
|
|
|
|
|
|
|
|
AMD-specific with SME support: it indicates the secure memory encryption
|
|
|
|
|
mask. Makedumpfile tools need to know whether the crash kernel was
|
|
|
|
|
encrypted. If SME is enabled in the first kernel, the crash kernel's
|
|
|
|
|
page table entries (pgd/pud/pmd/pte) contain the memory encryption
|
|
|
|
|
mask. This is used to remove the SME mask and obtain the true physical
|
|
|
|
|
address.
|
|
|
|
|
|
|
|
|
|
Currently, sme_mask stores the value of the C-bit position. If needed,
|
|
|
|
|
additional SME-relevant info can be placed in that variable.
|
|
|
|
|
|
2019-06-12 17:52:49 +00:00
|
|
|
For example::
|
|
|
|
|
|
|
|
|
|
[ misc ][ enc bit ][ other misc SME info ]
|
|
|
|
|
0000_0000_0000_0000_1000_0000_0000_0000_0000_0000_..._0000
|
|
|
|
|
63 59 55 51 47 43 39 35 31 27 ... 3
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
x86_32
|
|
|
|
|
======
|
|
|
|
|
|
|
|
|
|
X86_PAE
|
|
|
|
|
-------
|
|
|
|
|
|
|
|
|
|
Denotes whether physical address extensions are enabled. It has the cost
|
|
|
|
|
of a higher page table lookup overhead, and also consumes more page
|
|
|
|
|
table space per process. Used to check whether PAE was enabled in the
|
|
|
|
|
crash kernel when converting virtual addresses to physical addresses.
|
|
|
|
|
|
|
|
|
|
ARM64
|
|
|
|
|
=====
|
|
|
|
|
|
|
|
|
|
VA_BITS
|
|
|
|
|
-------
|
|
|
|
|
|
|
|
|
|
The maximum number of bits for virtual addresses. Used to compute the
|
|
|
|
|
virtual memory ranges.
|
|
|
|
|
|
|
|
|
|
kimage_voffset
|
|
|
|
|
--------------
|
|
|
|
|
|
|
|
|
|
The offset between the kernel virtual and physical mappings. Used to
|
|
|
|
|
translate virtual to physical addresses.
|
|
|
|
|
|
|
|
|
|
PHYS_OFFSET
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
Indicates the physical address of the start of memory. Similar to
|
|
|
|
|
kimage_voffset, which is used to translate virtual to physical
|
|
|
|
|
addresses.
|
|
|
|
|
|
|
|
|
|
KERNELOFFSET
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
The kernel randomization offset. Used to compute the page offset. If
|
|
|
|
|
KASLR is disabled, this value is zero.
|
|
|
|
|
|
2020-05-11 13:01:56 +00:00
|
|
|
KERNELPACMASK
|
|
|
|
|
-------------
|
|
|
|
|
|
|
|
|
|
The mask to extract the Pointer Authentication Code from a kernel virtual
|
|
|
|
|
address.
|
|
|
|
|
|
2020-05-13 18:52:37 +00:00
|
|
|
TCR_EL1.T1SZ
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
Indicates the size offset of the memory region addressed by TTBR1_EL1.
|
|
|
|
|
The region size is 2^(64-T1SZ) bytes.
|
|
|
|
|
|
|
|
|
|
TTBR1_EL1 is the table base address register specified by ARMv8-A
|
|
|
|
|
architecture which is used to lookup the page-tables for the Virtual
|
|
|
|
|
addresses in the higher VA range (refer to ARMv8 ARM document for
|
|
|
|
|
more details).
|
|
|
|
|
|
2022-02-09 09:26:42 +00:00
|
|
|
MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END
|
2022-03-09 12:16:33 +00:00
|
|
|
-----------------------------------------------------------------------------
|
2022-02-09 09:26:42 +00:00
|
|
|
|
|
|
|
|
Used to get the correct ranges:
|
|
|
|
|
MODULES_VADDR ~ MODULES_END-1 : Kernel module space.
|
|
|
|
|
VMALLOC_START ~ VMALLOC_END-1 : vmalloc() / ioremap() space.
|
|
|
|
|
VMEMMAP_START ~ VMEMMAP_END-1 : vmemmap region, used for struct page array.
|
|
|
|
|
|
2019-01-10 12:19:43 +00:00
|
|
|
arm
|
2019-06-12 17:52:49 +00:00
|
|
|
===
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
ARM_LPAE
|
|
|
|
|
--------
|
|
|
|
|
|
|
|
|
|
It indicates whether the crash kernel supports large physical address
|
|
|
|
|
extensions. Used to translate virtual to physical addresses.
|
|
|
|
|
|
|
|
|
|
s390
|
|
|
|
|
====
|
|
|
|
|
|
|
|
|
|
lowcore_ptr
|
2019-06-12 17:52:49 +00:00
|
|
|
-----------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
An array with a pointer to the lowcore of every CPU. Used to print the
|
|
|
|
|
psw and all registers information.
|
|
|
|
|
|
|
|
|
|
high_memory
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
Used to get the vmalloc_start address from the high_memory symbol.
|
|
|
|
|
|
|
|
|
|
(lowcore_ptr, NR_CPUS)
|
|
|
|
|
----------------------
|
|
|
|
|
|
|
|
|
|
The maximum number of CPUs.
|
|
|
|
|
|
|
|
|
|
powerpc
|
|
|
|
|
=======
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
node_data|(node_data, MAX_NUMNODES)
|
|
|
|
|
-----------------------------------
|
|
|
|
|
|
|
|
|
|
See above.
|
|
|
|
|
|
|
|
|
|
contig_page_data
|
|
|
|
|
----------------
|
|
|
|
|
|
|
|
|
|
See above.
|
|
|
|
|
|
|
|
|
|
vmemmap_list
|
|
|
|
|
------------
|
|
|
|
|
|
|
|
|
|
The vmemmap_list maintains the entire vmemmap physical mapping. Used
|
|
|
|
|
to get vmemmap list count and populated vmemmap regions info. If the
|
|
|
|
|
vmemmap address translation information is stored in the crash kernel,
|
|
|
|
|
it is used to translate vmemmap kernel virtual addresses.
|
|
|
|
|
|
|
|
|
|
mmu_vmemmap_psize
|
|
|
|
|
-----------------
|
|
|
|
|
|
|
|
|
|
The size of a page. Used to translate virtual to physical addresses.
|
|
|
|
|
|
|
|
|
|
mmu_psize_defs
|
|
|
|
|
--------------
|
|
|
|
|
|
|
|
|
|
Page size definitions, i.e. 4k, 64k, or 16M.
|
|
|
|
|
|
|
|
|
|
Used to make vtop translations.
|
|
|
|
|
|
2019-06-12 17:52:49 +00:00
|
|
|
vmemmap_backing|(vmemmap_backing, list)|(vmemmap_backing, phys)|(vmemmap_backing, virt_addr)
|
|
|
|
|
--------------------------------------------------------------------------------------------
|
2019-01-10 12:19:43 +00:00
|
|
|
|
|
|
|
|
The vmemmap virtual address space management does not have a traditional
|
|
|
|
|
page table to track which virtual struct pages are backed by a physical
|
|
|
|
|
mapping. The virtual to physical mappings are tracked in a simple linked
|
|
|
|
|
list format.
|
|
|
|
|
|
|
|
|
|
User-space tools need to know the offset of list, phys and virt_addr
|
|
|
|
|
when computing the count of vmemmap regions.
|
|
|
|
|
|
|
|
|
|
mmu_psize_def|(mmu_psize_def, shift)
|
|
|
|
|
------------------------------------
|
|
|
|
|
|
|
|
|
|
The size of a struct mmu_psize_def and the offset of mmu_psize_def's
|
|
|
|
|
member.
|
|
|
|
|
|
|
|
|
|
Used in vtop translations.
|
|
|
|
|
|
|
|
|
|
sh
|
|
|
|
|
==
|
|
|
|
|
|
|
|
|
|
node_data|(node_data, MAX_NUMNODES)
|
|
|
|
|
-----------------------------------
|
|
|
|
|
|
|
|
|
|
See above.
|
|
|
|
|
|
|
|
|
|
X2TLB
|
|
|
|
|
-----
|
|
|
|
|
|
|
|
|
|
Indicates whether the crashed kernel enabled SH extended mode.
|
2022-10-26 14:42:08 +00:00
|
|
|
|
|
|
|
|
RISCV64
|
|
|
|
|
=======
|
|
|
|
|
|
|
|
|
|
VA_BITS
|
|
|
|
|
-------
|
|
|
|
|
|
|
|
|
|
The maximum number of bits for virtual addresses. Used to compute the
|
|
|
|
|
virtual memory ranges.
|
|
|
|
|
|
|
|
|
|
PAGE_OFFSET
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
Indicates the virtual kernel start address of the direct-mapped RAM region.
|
|
|
|
|
|
|
|
|
|
phys_ram_base
|
|
|
|
|
-------------
|
|
|
|
|
|
|
|
|
|
Indicates the start physical RAM address.
|
|
|
|
|
|
|
|
|
|
MODULES_VADDR|MODULES_END|VMALLOC_START|VMALLOC_END|VMEMMAP_START|VMEMMAP_END|KERNEL_LINK_ADDR
|
|
|
|
|
----------------------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
Used to get the correct ranges:
|
|
|
|
|
|
|
|
|
|
* MODULES_VADDR ~ MODULES_END : Kernel module space.
|
|
|
|
|
* VMALLOC_START ~ VMALLOC_END : vmalloc() / ioremap() space.
|
|
|
|
|
* VMEMMAP_START ~ VMEMMAP_END : vmemmap space, used for struct page array.
|
|
|
|
|
* KERNEL_LINK_ADDR : start address of Kernel link and BPF
|
2023-07-24 10:09:17 +00:00
|
|
|
|
|
|
|
|
va_kernel_pa_offset
|
|
|
|
|
-------------------
|
|
|
|
|
|
|
|
|
|
Indicates the offset between the kernel virtual and physical mappings.
|
|
|
|
|
Used to translate virtual to physical addresses.
|
