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BREAK<br />
Format:<br />
I I<br />
I BREAK I<br />
I I<br />
id<br />
symbol<br />
hexloc<br />
id is any decimal number between 0 and 15 inclusive<br />
symbol is a name which has been assigned (using the DEF<br />
request) to the core address at which a breakpoint<br />
is to be set<br />
hexloc is the hexadecimal core location (relative to the<br />
current origin) at which a breakpoint is to be set<br />
Usage:<br />
This request enables the user to stop execution of a program<br />
at specific instruction location called breakpoints.<br />
Issuing the BREAK request causes only one breakpoint to be<br />
set. separate BREAK requests must be issued for each<br />
breakpoint desired. A maximum of sixteen breakpoints may be<br />
in effect at any given time, and any attempt to set more<br />
than sixteen is rejected .•<br />
The first operand of the BREAK request specifies the<br />
identification number assigned to the breakpoint being set.<br />
It must be a decimal number between 0 and 15 inclusive. If<br />
an identification number is specified which is the same as a<br />
currently set breakpointl• the previous breakpoint is cleared<br />
and the new one is set.<br />
The second operand of the BREAK request indicates the core<br />
address at which the breakpoint is to be set. If this<br />
operand contains any non-numeric characters, the DEBUG<br />
symbol table is searched for a matching symbol entry. If a<br />
match is found, the breakpoint is set at the core address to<br />
which the symbol name is assigned provided that address is<br />
on an even (halfword) boundary. If no match 1S found in the<br />
DEBUG symbol table" or if the second operand contains only',<br />
numeric characters, the current origin as established by<br />
the ORIGIN request is added to the specified operand and the<br />
breakpoint is set at the resulting core address provided<br />
that address is on a halfword boundary.<br />
The DEBUG program sets a breakpoint by saving the contents<br />
of the byte located at the core address specified by the<br />
second operand of the BREAK request,. This byte is replaced<br />
by the byte EX where x is the hexadecimal equivalent of the<br />
breakpoint identifier specified in the first operand. For<br />
the breakpoint setting to have meaning, the core address<br />
indicated by the second operand must be the location of an<br />
DEBUG - BREAK 221'"
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