Setting Data Breakpoints, Deleting Data Breakpoints

Ski IA-64 Simulator Reference Manual 1.0L

iabs [address]

Sets an IA-32 breakpoint at the speciﬁed address or, if no address is given, at the location pointed to by ip.

bd breakpoint_number

Deletes the breakpoint numbered by breakpoint_number.

Deletes all breakpoints.

Displays a list of currently set breakpoints.

8.4Data Breakpoints

Data breakpoints can be viewed as temporary access restrictions on an area of data. Access of a datum within the speciﬁed area causes a running program to halt at the instruction which attempted the access. Control is then returned to the user at command level.

The simulator allows up to ten areas to be speciﬁed within which data breakpoints may be set. They may vary in size from one byte to an entire region. Further, the area may be speciﬁed to cause a break either only on reads, writes, or on both reads and writes. Several commands apply to the manipulation of these data breakpoints.

8.4.1Setting Data Breakpoints

The dbs command sets data breakpoints. The command requires two arguments and accepts an optional third argument. The ﬁrst argument is the starting address of the area which is associated with the break. The second argument speciﬁes the length of the area (in bytes). The third argument, if present, is the string rw (default), which indicates that the break is to occur on both reads or writes, r, which indicates that only reads cause breaks, or w, which indicates that only writes cause breaks.

8.4.2Deleting Data Breakpoints

Two commands delete data breakpoints. The dbD command deletes all data breakpoints currently set. It takes no argu- ments and requires no veriﬁcation from the user. The dbd command deletes the data breakpoint with the number speciﬁed by the argument.

8.4.3Listing Data Breakpoints

The dbl command causes a list of currently set data breakpoints to be displayed on the screen, symbolically if possible.

8.4.4Summary of Data Breakpoint Commands

dbs address length [type]

Sets a data breakpoint at the speciﬁed address. The length of the area (in bytes) is set to length. Type is the string rw (default) specifying breaks on reads or writes, r, specifying breaks on reads only, or w, specifying breaks on writes only.

dbd number

Deletes the data breakpoint numbered by number.

dbD

Deletes all data breakpoints.

dbl

Displays on the screen a list of currently set data breakpoints.

Debugging

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HP IA-64 manual Setting Data Breakpoints, Deleting Data Breakpoints, Listing Data Breakpoints

Models: IA-64 Ski Simulator