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EXIT$ (E)
GO (G)
HDG
JHT
Program Trace Routine
Terminates the traced activity by means of an EXIT$ request. Trace mode is
terminated and the last instruction is printed.
Returns to trace mode from command mode.
This command allows the caller to insert print control information into SNOOPY's
output, whether directed to a standard symbiont file or to an alternate file. Unless
given as “HDG*”, the command buffer is flushed, and all other commands on the
line are ignored. In any case, the input for this command is solicited by the printout
“HDG- -”. Only print control information may go on this line; no commands are
permitted. The format is identical to that used for the PRTCN$/PRTCA$ ERs.
In particular, for heading information, the format is “H,opt,ps,txt”. But any of the
other print control functions may be used.
Prints the jump history table, starting with the most recent jump-from address and
continuing with the last eight jump instructions that transfer control. The table is
cleared on entry to SNOOPY, so fewer than eight addresses may be printed early in
a trace. A jump that has been executed several times in succession without any
other jumps intervening (that is, a loop) produces a listing with a repeat count, rather
than many identical entries in the table. On 1100/60, 1100/70, and 1100/80
systems, if SNOOPY is activated by a contingency after a call on SNCNT$, the JHT
command can be used to retrieve the hardware jump history stack as captured at
the time of the contingency. This applies only to hardware contingencies (IOPR,
IGDM, IFOF, IFUF, and IDOF).
JUMP (J)
Transfers control to an address specified as an octal number or externally defined
symbol. The current absolute and relative P-register values are displayed. If the new
value is within the program storage limits, that value is set into the P register. The
new value is printed in relative form, and the next command is executed.
This command is the only way to get out of EXIT$ mode and do further tracing by
means of the TON$ command. If TON$ is used in the EXIT$ mode without a JUMP
command, the TON$ command is rejected and a message is displayed.
If a JUMP command is used in EXIT$ mode termination, the termination mode
becomes a TOFF$ termination. Use a TON$ command to continue tracing.
The jump-to address specified for the JUMP command may be an external symbol
as well as an octal value, subject to the restrictions on use of external symbols noted
for the ABSAD command.
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