.MA Output Field Descriptions

Output from .MA is in a tabular format of the following form:

 har     par      cpg        va    flg next prev link hash hob   hal
 0005 %fef26078 0000dfb0 %04000000 007 0259 006e 0000 0000 fff0 0000 max=%1fff0000
 0009 %fef260d0 00000010 %ffe3d000 009 000b 0008 0000 0000 000a 0000   sel=0120
 00b4 %fef26f82 00000010 %1a0e0000 379 00bb 00b5 0000 0000 00c1 0000  hco=0022e
 00ea %fef27426 00000010 %1aba0000 179 00e9 00eb 0000 0000 02b6 0000      =0000
 00e7 %fef273e4 00000010 %00020000 179 00e8 00db 0000 0000 011e 0000 hptda=0097

The field headings have the following meaning:

har

The handle of the arena record being formatted. This is the unique identifier by which the arena record is known.
par
The linear address of the arena record being displayed.
cpg
The size of the contiguous linear address range reserved by this arena record expressed as a hexadecimal number of pages. This value will be greater then or equal to the size of the memory object that occupies this linear address range.

For small allocations (<64K) in non-system arenas this will usually be rounded to 0x10 pages so that the CRMA may be applied.

For free records this field is used as a chain pointer to the next free record but only the low order 20 bits are displayed by .MA.

va
The linear address of the beginning of the memory object represented by the arena record.
flg
Arena record flags. These may take a combination of the following settings:

┌────────────────────┬──────────┬──────────────────────────────┐
│Name                │Bit Mask  │Description                   │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_INUSE            │0x001     │Record not on free list       │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_TAG              │0x006     │Record type mask              │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_TAGREG           │0x000     │Regular record                │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_TAGSEN           │0x002     │Sentinel                      │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_TAGBSEN          │0x006     │Boundary sentinel             │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_SELMAP           │0x008     │Memory mapped by selector     │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_SELBASEALL       │0x00c     │Base selector map all         │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_SELMASK          │0x00c     │Selector map mask             │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_RELOAD           │0x010     │Pre-reserved for huge item or │
│                    │          │or reserved for reload of MTE │
│                    │          │object                        │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_WRITE            │0x020     │write permission              │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_USER             │0x040     │user permission               │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_EXEC             │0x080     │executable permission         │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_READ             │0x100     │Read permission               │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_HCO              │0x200     │Record linked to Context List │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_GUARD            │0x400     │guard page                    │
├────────────────────┼──────────┼──────────────────────────────┤
│AR_SGS              │0x800     │Registered under Screen Group │
│                    │          │Switch control.               │
└────────────────────┴──────────┴──────────────────────────────┘

next
Handle of next arena record within the same arena (private, shared or system).
prev
Handle of the previous record within the same arena (private, shared or system).
link
Handle of an associated arena record.
For private arena sentinel records this points to the boundary sentinel.
For shared arena shared data this points to other private arenas sharing the same object.
For alias objects this points to the arena record of the associated (aliased) object.
hash
Handle of the next arena record whose va hashes to the same hash chain.
hob
The handle of the associated memory object record. See .MO command.
hal
The handle of the associated memory alias record. See .ML command. If this field is set to a value of 0xffff then this is not the handle of an alias record, but signifies that this arena has been privatized by the creation of an alias to it.
hptda=hhhh
The handle of the pseudo-object that is the PTDA of the process that has this arena record assigned to its private address space. Use .MO hhhh to display the PTDA pseudo-object and hence obtain the address of its virtual address.
max=%mmmmmmmm
Maximum linear address of the area headed by this sentinel record.
sel=ssss
GTD selector that is assigned to a system arena memory object.
hco=ccccc
Handle of the first context record that represents processes sharing this shared arena, shared data memory object. See .MC command.

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