SZVHB Back to Index page
 
Prolog 
Control Block Contents 
   SZVHB DSECT
   SZVSB DSECT
   SZVMA DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.

 
  SZVHB Control Block Content Top of page
  




 SZVHB DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SZVHB          Save area header and linkage used for CP C
                                        assembler
 ----------------------------------------------------------
 Stack header layout for a stack extension area           |
      Note ! Any changes to the stack header which modify the  |
             available size must update HCPDCCPL MACRO contant.|
       offset|                                                 |
       x'00' |x'00DCCDCC'      | flags  |reserved (3 bytes)    |
       x'08' | ptr->previous stack extension                   |
       x'10' | ptr->next stack extension area                  |
       x'18' | address of last byte of this stack extension    |
       x'20' | VMDBK ptr                                       |
       x'28' | Container thread context ptr                    |
       x'30' | next available save area ptr                    |
       x'38' | reserved                                        |
       x'40'-end     function saveareas                        |
      ----------------------------------------------------------
0000    0 Bitstring    1 SZVHEAD (0)    Stack area header
0000    0 Character    4 SZVHEYE        Eyecatcher
0004    4 Bitstring    1 SZVHFLG        Flags
          00000001       SZVHTOP        X'01' SZVHTOP First stack area
          00000002       SZVHBIG        X'02' SZVHBIG Large stack
                                        area(not GETST)
          00000004       SZVHMPA        X'04' SZVHMPA Mupltiple pages
0005    5 Bitstring    1 SZVHPAG        Number of page allocated
0006    6 Bitstring    2 *              reserved
0008    8 Address      8 SZVHPRE        Previous stack area ptr
0010   16 Address      8 SZVHNXT        Next stack area ptr
0018   24 Address      8 SZVHEND        Address of last byte of stack
                                        area
0020   32 Address      8 SZVHVMD        Ptr to VMDBK
0028   40 Address      8 SZVHTX         Container thead context pointer
0030   48 Address      8 SZVHSNA        Next available save area pointer
0038   56 Address      8 *              Reserved
0040   64 Address      8 SZVHSV1 (0)    First save area
     SZVHSIZ=4095 If storage obtained by HCPSZU01 is a full page
     SZVHSIZ=4071 If storage obtained is FREMX
          00000FE7       SZVHSIZ        4071 Current stack area end size




 SZVSB DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SZVSB          Save area header and linkage used for CP C
                                        assembler
 ----------------------------------------------------------
 Individual save area layout                              |
  offset|                                                 |
  x'00' | ptr->stack extension (see above)                |
  x'08' | ptr->previous save area                         |
  x'10' | ptr->next save area                             |
  x'18' | 3 double words, that used to be after regs      |
  x'30' | 1 word with nothing                             |
  x'34' | 'F4SA' put in by XL                             |
  x'38' | registers 14-12                                 |
  x'B0' | dynamic storage start                           |
 ----------------------------------------------------------
0000    0 Address      8 SZVSHDR        Ptr->stack area header
0008    8 Address      8 SZVSPREV       Ptr->previous save area
0010   16 Address      8 SZVSNEXT       Ptr->next save area or 0
0018   24 Character   24 SZVSXTRA       Open area by compiler
0018   24 Signed       4 SZVSRRET       Move RC to here before trace
001C   28 Signed       4 SZVSRRSN       Move RSN to here before trace
0020   32 Signed       4 SZVSREID       Move EID to here before trace
0024   36 Signed       4 *              reserved
0028   40 Address      8 SZVSFNCH       Function header address
0030   48 Address      8 SZVSXLRP (0)   Where R13 points to in XL
0030   48 Signed       4 SZVSCRW        An unused word
0034   52 Signed       4 SZVSF4S        A word for 'F4SA' Done by XL
0038   56 Address      8 SZVSREGS (0)   Callers registers
0038   56 Address      8 SZVSR14        Callers reg 14
0040   64 Address      8 SZVSR15        Callers reg 15
0048   72 Address      8 SZVSR0         Callers reg 0
0050   80 Address      8 SZVSR1         Callers reg 1
0058   88 Address      8 SZVSR2         Callers reg 2
0060   96 Address      8 SZVSR3         Callers reg 3
0068  104 Address      8 SZVSR4         Callers reg 4
0070  112 Address      8 SZVSR5         Callers reg 5
0078  120 Address      8 SZVSR6         Callers reg 6
0080  128 Address      8 SZVSR7         Callers reg 7
0088  136 Address      8 SZVSR8         Callers reg 8
0090  144 Address      8 SZVSR9         Callers reg 9
0098  152 Address      8 SZVSR10        Callers reg 10
00A0  160 Address      8 SZVSR11        Callers reg 11
00A8  168 Address      8 SZVSR12        Callers reg 12
00B0  176 Dbl-Word     8 SZVSDYN (0)    Dynamic storage start
 ----------------------------------------------------------
 This DSECT is just a dummy placeholder so that we can    |
 have storage management put an id in the trailer.        |
 This ID will be used by SZX when it does the malloc and  |
 free's.                                                  |
 ----------------------------------------------------------




 SZVMA DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SZVMA          Save area header and linkage used for CP C
                                        assembler
0000    0 Address      8 SZVMALLO
 
 
  SZVHB Storage Layout Top of page
  
 
*** SZVHB - Save area header and linkage used for CP C assembler
*
*     +---------------------------+------+------+-------------+
*   0 |         SZVHEYE           |:HFLG |:HPAG |/////////////|
*     +---------------------------+------+------+-------------+
*   8 |                       SZVHPRE                         |
*     +-------------------------------------------------------+
*  10 |                       SZVHNXT                         |
*     +-------------------------------------------------------+
*  18 |                       SZVHEND                         |
*     +-------------------------------------------------------+
*  20 |                       SZVHVMD                         |
*     +-------------------------------------------------------+
*  28 |                        SZVHTX                         |
*     +-------------------------------------------------------+
*  30 |                       SZVHSNA                         |
*     +-------------------------------------------------------+
*  38 |///////////////////////////////////////////////////////|
*     +-------------------------------------------------------+
*
*** SZVHB - Save area header and linkage used for CP C assembler
 
*** SZVSB - Save area header and linkage used for CP C assembler
*
*     +-------------------------------------------------------+
*   0 |                       SZVSHDR                         |
*     +-------------------------------------------------------+
*   8 |                       SZVSPREV                        |
*     +-------------------------------------------------------+
*  10 |                       SZVSNEXT                        |
*     +-------------------------------------------------------+
*  18 |                                                       |
*     =                       SZVSXTRA                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  30
*
*** SZVSB - Save area header and linkage used for CP C assembler
 
*** Overlay for SZVSXTRA in SZVSB
*
*     +---------------------------+---------------------------+
*  18 |         SZVSRRET          |         SZVSRRSN          |
*     +---------------------------+---------------------------+
*  20 |         SZVSREID          |///////////////////////////|
*     +---------------------------+---------------------------+
*  28 |                       SZVSFNCH                        |
*     +---------------------------+---------------------------+
*  30 |         SZVSCRW           |         SZVSF4S           |
*     +---------------------------+---------------------------+
*  38 |                       SZVSR14                         |
*     +-------------------------------------------------------+
*  40 |                       SZVSR15                         |
*     +-------------------------------------------------------+
*  48 |                        SZVSR0                         |
*     +-------------------------------------------------------+
*  50 |                        SZVSR1                         |
*     +-------------------------------------------------------+
*  58 |                        SZVSR2                         |
*     +-------------------------------------------------------+
*  60 |                        SZVSR3                         |
*     +-------------------------------------------------------+
*  68 |                        SZVSR4                         |
*     +-------------------------------------------------------+
*  70 |                        SZVSR5                         |
*     +-------------------------------------------------------+
*  78 |                        SZVSR6                         |
*     +-------------------------------------------------------+
*  80 |                        SZVSR7                         |
*     +-------------------------------------------------------+
*  88 |                        SZVSR8                         |
*     +-------------------------------------------------------+
*  90 |                        SZVSR9                         |
*     +-------------------------------------------------------+
*  98 |                       SZVSR10                         |
*     +-------------------------------------------------------+
*  A0 |                       SZVSR11                         |
*     +-------------------------------------------------------+
*  A8 |                       SZVSR12                         |
*     +-------------------------------------------------------+
*
*** Overlay for SZVSXTRA in SZVSB
 
*** SZVMA - Save area header and linkage used for CP C assembler
*
*     +-------------------------------------------------------+
*   0 |                       SZVMALLO                        |
*     +-------------------------------------------------------+
*   8
*
*** SZVMA - Save area header and linkage used for CP C assembler
 
 
  SZVHB Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
SZVHBIG        0004 00000002
SZVHEAD        0000
SZVHEND        0018
SZVHEYE        0000
SZVHFLG        0004
SZVHMPA        0004 00000004
SZVHNXT        0010
SZVHPAG        0005
SZVHPRE        0008
SZVHSIZ        0040 00000FE7
SZVHSNA        0030
SZVHSV1        0040
SZVHTOP        0004 00000001
SZVHTX         0028
SZVHVMD        0020
SZVMALLO       0000
SZVSCRW        0030
SZVSDYN        00B0
SZVSFNCH       0028
SZVSF4S        0034
SZVSHDR        0000
SZVSNEXT       0010
SZVSPREV       0008
SZVSREGS       0038
SZVSREID       0020
SZVSRRET       0018
SZVSRRSN       001C
SZVSR0         0048
SZVSR1         0050
SZVSR10        0098
SZVSR11        00A0
SZVSR12        00A8
SZVSR14        0038
SZVSR15        0040
SZVSR2         0058
SZVSR3         0060
SZVSR4         0068
SZVSR5         0070
SZVSR6         0078
SZVSR7         0080
SZVSR8         0088
SZVSR9         0090
SZVSXLRP       0030
SZVSXTRA       0018
 
This information is based on z/VM 6.4.0 Last updated on 24 Aug 2016 at 09:44:22 EDT.
Copyright IBM Corporation, 1990, 2016