AT&T UNIX™PC Unix System V Users Manual - tenox

SDB ( 1) SDB ( 1)
An exception to this interpretation occurs when displaying variable
addresses. An entire structure does have an address, and it is
this value sdb displays, not the addresses of individual elements.
Elements of a multidimensional array may be referenced as
variable [number] [number] ... ,
or as
variable [number,number, ... ].
In place of number, the form number;number may be used to
indicate a range of values, * may be used to indicate all legitimate
values for that subscript, or subscripts may be omitted entirely if
they are the last subscripts and the full range of values is desired .
.AJ; with structures, sdb displays all the values of an array or section
of an array if trailing subscripts are omitted. It displays only
the address of the array itself or section specified by the user if
subscripts are omitted.
A particular instance of a variable on the stack may be referenced
by using the form procedure :variable ,number. All the variations
mentioned in naming variables may be used. Number is the
occurrence of the specified procedure on the stack, counting the
top, or most current, as the first. If no procedure is specified, the
procedure currently executing is used by default.
It is also possible to specify a variable by its address. All forms of.
integer constants which are valid in C may be used, so that
addresses may be input in decimal, octal or hexadecimal .
Line numbers in the source program are referred to as filename
:number or procedure :number. In either case the number is
relative to the beginning of the file. If no procedure or file name is
given, the current file is used by default. If no number is given,
the first line of the named procedure or file is used.
While a process is running under sdb, all addresses refer to the
executing program; otherwise they refer to objfil or corfil . An initial
argument of -w permits overwriting locations in objjil .
Addresses.
The address in a file associated with a written address is determined
by a mapping associated with that file. Each mapping is
represented by two triples ( b1, e1, /1 ) and ( b2, e2, /2 ) and the file
address corresponding to a written address is calculated as follows:
b1 � address< e1
file address= address+/1- b1
otherwise
b2� address< e2
file address= address+f2- b2
otherwise, the requested address is not legal. In some cases (e.g.
for programs with separated I and D space) the two segments for a
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