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HOW

USE

THE

TRACING

ROUTINE

The

tracing

routine

Operating

System/360

optional

feature

which

you

can

use

debugging

and

maintenance

aid.

The

tracing

routine

stores,

table,

information

pertaining

the

following

conditions:

•

SIO

instruction

execution.

•

SVC

interruption.

•

I/O

interruption.

You

can

include

the

tracing

routine

and

its

table

the

control

program

during

the

system

generation

process.

This

done

using

the

TRACE

option

the

SUPRVSOR

macro-instruction.

The

format

this

option

requires

you

supply

the

number

entries

the

table.

Each

table

entry

can

contain

information

relating

one

the

traced

conditions.

When

the

last

entry

the

table

filled,

the

entry

will

overlay

the

first.

Table

Entry

Forrrats

Table

entry

formats

are

follows:

SIO

Instruction

3110

Channel

Device

Channel Status Word

Address

Address Word

(Meanin9ful onlylwhen bits

2-3

= 01)

"-.

Condition Code

I/O

Interruption

13-

1619

310

3110

0000

Channel Status Word

~--------------v---------------~

I/O

Old

PSW

SVC

Interruption

310

1 0001

Contents of

Contents

\~--------------~y---------------~

SVC

Old

PSW

Location

the

Table

The

addresses

the

last

entry

made

the

table,

the

beginning

the

table,

and

the

end

the

table

are

contained

12-byte

field.

The

address

this

field

contained

the

full

word

starting

location

20.

The

format

the

field

follows:

How

Use

the

Tracing

Routine

109

Brand	IBM
Model	System/360
Category	Desktop
Language	English

IBM System/360 System Programmer's Guide

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