LOOK-AT

@LOOK-AT <space-reference>

This command may be used to examine or modify memory locations and registers. <space-reference> may be

MEMORY

meaning user's virtual memory space. This is allowed for all users.

SEGMENT

A real-time program segment on mass storage may be reached. A segment number must be given as an additional parameter. This is allowed only for users RT and SYSTEM. A modification causes a permanent change of the specified location on the segment.

RTCOMMON

Locations on the common area for RT programs may be reached. This is allowed only for users RT and SYSTEM. A modification takes place in memory and leads only to a temporary change of the specified location. The next time SINTRAN is loaded the "old" values are retained.

IMAGE

Locations of the memory image of the resident part of SINTRAN III on mass storage can be reached. This is allowed only for user SYSTEM. A modification causes a permanent change of the specified location.

RESIDENT

Locations of the resident parts of SINTRAN III operating system can be reached. This is allowed only for user SYSTEM. A modification takes place in memory and leads only to a temporary change of the specified location. The next time the corresponding core-image is loaded to the memory, the "old" values are retained.

When the <space-reference> given has been checked for legality, and made available if mass storage segments are involved, the message READY is typed.

To examine a location, the octal address should be typed, followed by a slash (/). The octal contents will then be printed. The contents may now be changed by typing an octal value, followed by a carriage return. If only a cr, without a new value, is given, the contents remain unchanged and the contents of the next location are printed.

If an asterisk (*) is typed, the current address will be printed.

The contents of registers can be addressed in the same way, using a single letter to specify the register. The letters are:

P, X, T, A, D, L, S, B.

When a character not mentioned above is typed, the command is terminated and control will return to normal control mode.

If locations on mass storage sections are changed, the pages will be written out so that "patches" will be made permanent. Locations changed in the user's virtual memory or the resident part of the operating system are changed temporarily. They may be altered when loading a user program or reloading the system.

References

Norsk Data Document ND–60.050.06 SINTRAN III USERS GUIDE sections 3.3.6.2, 5.4 and 6.4.3

Norsk Data Document ND–60.128.01 SINTRAN III REFERENCE MANUAL (printed June 1980), pages 1-103, 1-104

Norsk Data Document ND–60.174.Q01 SINTRAN III QUICK REFERENCE CARD