To Enable/Disable Breakpoints - HP 64746 User Manual

To enable/disable breakpoints

• Choose the Breakpoints→Enable toggle.
• When displaying the breakpoint list, press and hold the select mouse button and
then choose Enable/Disable Software Breakpoints from the popup menu.
• Using the command line, enter the modify software_breakpoints enable or
modify software_breakpoints disable command.
The breakpoints feature must be enabled before you can set, inactivate, or clear
breakpoints.
If breakpoints were set when the feature was disabled, they are "inactivated" when
the feature is re-enabled, and you must set them again.
The emulator/analyzer interface will enable software breakpoints whenever the
XEnv_68k_except symbol is present in the symbol data base.
The run-time library provided with the 68000 C Cross Compiler uses software
breakpoints to interrupt program execution when exceptions (for example, divide
by zero) are encountered. If software breakpoints are disabled, exception
processing may result in "access to guarded memory" errors and/or other
unpredictable behavior. To prevent this, a special global symbol,
XEnv_68k_except, is included in the library.
When the XEnv_68k_except symbol is present, the 68302 emulator writes a value
to this location. The value tells the run-time library which TRAP instruction to use
to perform a software break.
Chapter 6: Using the Emulator
Using Software Breakpoints
203