DIS
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| E0201 Edition 4 | |
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Syntax
DIS nmword [virtaddr] DIS cmword1 [cmword2] [cmlogaddr]The DCx (display code) commands can be used to display a block of code at a specified address. The program windows also display disassembled code.
Parameters
- nmword
The Precision Architecture instruction to disassemble. All disassembled values are in decimal unless otherwise indicated.
- cmword1
The CM HP 3000 instruction to disassemble.
- cmword2
A second CM HP 3000 instruction to disassemble for double-word instructions.
- virtaddr
If a virtual address is given, this value is used when computing branch addresses. That is, "disassemble this instruction as if it were at the indicated address." A valid virtual address results in branch targets being printed as a procedure name plus offset. If this value is omitted, branch targets always appear as numeric values.
- cmlogaddr
If a CM logical address is specified, the address is used to compute the targets of CM PCAL instructions.
Cmlogaddr must be a full CM logical code address (LCPTR).
For example,
- CMPC
Current CM program counter
- CMPW+4
Top of CM program window + 4
- PROG(2.102)
Program file logical seg 2 offset 102
- fopen+102
CM procedure fopen + %102 (assumes CM mode)
- cmaddr('fopen')+%102
CM procedure fopen + %102 (NM or CM mode)
Examples
$nmdebug > dis 6bc23fd9 STW 2,-20(0,30)This NM example disassembles the NM word $6bc23fd9 into the STW instruction.
$nmdebug > dis e84001d8 BL $000000f4,2 $nmdebug > dis e84001d8, a.4adeb4 BL test_proc+$68,2This NM example disassembles the word $e84001d8 into a BL instruction. In the second command, the virtual address of the instruction is specified, and the disassembler is able to compute and to display the effective procedure name target of the branch.
%cmdebug > dis 41101 LOAD DB+%101This CM example disassembles the single CM word %41101 into the LOAD DB+%101 instruction.
%cmdebug > dis 20477 43 LDDW SDEC=1This CM example disassembles the two CM words, %20477 and %43, into the LDDW SDEC=1 instruction.
%cmdat > dis 31163 PCAL %163 %cmdat > dis 31163,,sys(25.0) PCAL ?SWITCH'TO'NM' %cmdat > dis 31163,,sys(1.0) PCAL ?ATTACHIOThese CM examples involve the CM PCAL instruction. In the first example, 31163 is recognized as the PCAL instruction, but the STT number is invalid for the current CM segment. In the second example, the instruction is disassembled as if it were found in CM logical segment SYS %25, and the resulting destination of the PCAL is displayed as ?SWITCH'TO'NM. The third example indicates that within CM logical segment SYS 1, the resulting target of a PCAL %163 is ?ATTACHIO.
%cmdat > var n 1
%cmdat > while 1 do {w "stt: " n:"w3" " " ;dis 31000+n; var n n+1}
stt: %1 PCAL ?TERMINATE
stt: %2 PCAL ?TERMINATE
stt: %3 PCAL ?ABORTJOB
stt: %4 PCAL ?ACTIVATE
stt: %5 PCAL ?ADOPT
stt: %6 PCAL ?ONENET'ADOPT
stt: %7 PCAL ?CREATEPROCESS
stt: %10 PCAL ?EXEC'TERMINATE
stt: %11 PCAL ?GET'PLFD'TBLPTR
stt: %12 PCAL ?GETORIGIN
stt: %13 PCAL ?GETPRIORITY
stt: %14 PCAL ?GETPROCID
stt: %15 PCAL ?GETPROCINFO
stt: %16 PCAL ?JSM'TO'CI'PIN
stt: %17 PCAL ?KILL
stt: %20 PCAL ?PROCINFO
stt: %21 PCAL ?PROCTIME
stt: %22 PCAL ?SET'JSM'TIME'LI
stt: %23 PCAL ?SET'PLFD'TBLPTR
stt: %24 PCAL ?SUSPEND
stt: %25 PCAL ?XCONTRAP
stt: %26 PCAL ?NM'BREAKCONTROL
stt: %27 PCAL ?SETSERVICE
stt: %30 PCAL ?REQUESTSERVICE
stt: %31 PCAL ?RESETCONTROL
stt: %32 PCAL ?CAUSEBREAK
stt: %33 PCAL ?CAUSEBREAK'
stt: %34 PCAL ?BRK'IN'BREAK
stt: %35 PCAL ?BRK'ABORT
stt: %36 PCAL ?BRK'RESUME
control-Y encountered
%cmdat >
This example demonstrates how a simple loop can be used to display the targets
for each STT entry within the current CM segment. Since we know that
%31000 is the PCAL instruction, we simply add the desired STT
number and use the DIS command to display the target entry point name.
Control-Y is used to terminate the loop.
Limitations, Restrictions
None
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