SDA obtains its information from the following:
o Images (.EXE files)
o Image symbol table files (.STB files)
o Object files
SDA also defines symbols to access registers and to access common
data structures.
The only images with symbols are shareable images and executive
images. These images contain only universal symbols, such as
constants and addresses.
The image symbol table files are produced by the linker with the
/SYMBOLS qualifier. These files normally contain only universal
symbols, as do the executable images. However, if the SYMBOL_
TABLE=GLOBALS linker option is specified, the .STB file also
contains all global symbols defined in the image. See the OpenVMS
Linker Utility Manual for more information.
Symbols can include lowercase letters. Commands that manipulate
symbols (such as DEFINE, SHOW SYMBOL, and UNDEFINE) require these
symbols to be enclosed within quotation marks ("symbol" ).
Some SDA commands predefine additional symbols. This includes
SET CPU and SET PROCESS (as shown in the following subtopics) and
also SHOW DEVICE and SHOW CLUSTER.
1 – Modules Containing Symbols
Object files can contain global constant values. An object
file used with SDA typically contains symbol definitions for
data structure fields. Such an object file can be generated by
compiling a MACRO-32 source module that invokes specific macros.
The macros, which are typically defined in SYS$LIBRARY:LIB.MLB
or STARLET.MLB, define symbols that correspond to data structure
field offsets. The macro $UCBDEF, for example, defines offsets
for fields within a unit control block (UCB). OpenVMS Alpha
and Integrity servers provide several such object modules in
SDA$READ_DIR, as listed in the following table. For compatibility
with OpenVMS VAX, the modules' file types have been renamed to
.STB.
File Contents
DCLDEF.STB Symbols for the DCL interpreter
DECDTMDEF.STB Symbols for transaction processing
GLXDEF.STB Symbols for OpenVMS Galaxy data
structures
IMGDEF.STB Symbols for the image activator
IODEF.STB I/O database structure symbols
NETDEF.STB Symbols for DECnet data structures
REQSYSDEF.STB Required symbols for SDA
RMSDEF.STB Symbols that define RMS internal and
user data structures and RMS$_xxx
completion codes
SCSDEF.STB Symbols that define data structures for
system communications services
SYSDEF.STB Symbols that define system data
structures, including the I/O database
TCPIP$NET_GLOBALS.STB* Data structure definitions for TCP/IP
internet driver, execlet, and ACP data
structures
TCPIP$NFS_GLOBALS.STB* Data structure definitions for TCP/IP
NFS server
TCPIP$PROXY_GLOBALS.STB* Data structure definitions for TCP/IP
proxy execlet
TCPIP$PWIP_GLOBALS.STB* Data structure definitions for TCP/IP
PWIP driver, and ACP data structures
TCPIP$TN_GLOBALS.STB* Data structure definitions for TCP/IP
TELNET/RLOGIN server driver data
structures
* The TCPIP$*.STB files are available only if TCP/IP has been
installed. These files are found in SYS$SYSTEM, so that all files
are not automatically read in when you issue a READ/EXEC command.
2 – Symbols Defined on Initialization
The following table lists symbols that SDA defines automatically
on initialization.
ASN Address space number
AST Both the asynchronous system trap status
and enable registers: AST<3:0> = AST enable;
AST<7:4> = AST status
BR0 through BR7 Branch registers (Integrity servers only)
CYCLE_COUNTER Process cycle counter
ESP Executive stack pointer
EBSP Executive register stack pointer (Integrity
servers only)
FEN Floating-point enable
FP Frame pointer (R29)
FP0 through FP31 Floating-point registers (Alpha only)
FP0 through FP127 Floating point registers (Integrity servers
only)
FPCR Floating-point control register (Alpha only)
FPSR Floating-point status register (Integrity
servers only)
GP Global pointer (R1) (Integrity servers only)
G FFFFFFFF.80000000(16), the base address of
system space
H 00000000.7FFE0000(16), a base address in P1
space
I FFFFFFFF.FFFFFFFF(16), also fills the leading
digits of a hexadecimal number with the value
of F
KSP Kernel stack pointer
KBSP Kernel register stack pointer (Integrity
servers only)
PAL_RSVD PAL reserved area in process HWPCB
PC Program counter
PCC Process cycle counter
PS Processor status
PTBR Page table base register
R0 through R31 Integer registers (Alpha only)
R0 through R127 Integer registers (Integrity servers only)
SCC System cycle counter
SP Current stack pointer of a process
SSP Supervisor stack pointer
SBSP Supervisor register stack pointer (Integrity
servers only)
SYSPTBR Page table base register for system space
USP User stack pointer
UBSP User register stack pointer (Integrity servers
only)
VIRBND Virtual Address Boundary for RADs (Alpha only)
3 – Symbols Defined by SET CPU
After a SET CPU command is issued (for analyzing a crash dump
only), the symbols defined in the following table are set for
that CPU.
CPUDB Address of CPU database
IPL Interrupt priority level register
MCES Machine check error summary register
PCBB Process context block base register
PRBR Processor base register (CPU database address)
RAD Address of RAD database
SCBB System control block base register
SISR Software interrupt status register
VPTB Virtual Page Table Base register
4 – Symbols Defined by SET PROCESS
After a SET PROCESS command is issued, the symbols listed in the
following table are defined for that process.
ARB Address of access rights block
FRED Address of floating-point register and execution data
block
JIB Address of job information block
KTB Address of the kernel thread block
ORB Address of object rights block
PCB Address of process control block
PHD Address of process header
PSB Address of persona security block