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Another way to execute until a stack level is reached is to choose Run Until
Stack Level in the Backtrace window pop-up menu.
Return Address. The return address field displays the return address of the
calling function.
Frame Status Character. One of several characters immediately precedes a
function name in the backtrace window. These frame status characters and
their descriptions are listed in the table below.
Character
Description
Space
The debugger is executing within a function.
:
The program counter is at a label. Typically, this is an
assembly language function point.
*
The function has been entered, but the function prolog has
not been executed. The debugger cannot locate local
symbols in the function until the prolog has been executed.
?
The frame is questionable. For example, this is displayed
when a function has been stripped of debug information.
!
The frame is not valid.
|
The debugger is at the start of an interrupt routine.
+
The debugger is executing an interrupt routine.
Module Name. If the function is in a known module, the backtrace window
displays the module name. If the program counter is pointing to an address
that is not contained in a module known to the debugger, the module field in
the backtrace window displays a string of question marks (???????).
Function Name. If the return address of a function is inside a known
function, the debugger displays the function name. If the address is outside of
all known functions, the function field in the backtrace window will display
< unknown> . This is the case with the compiler startup module crt0, because
it is assembly code and contains no debug information.
Backtrace Information. Whenever a break occurs in program execution, the
backtrace window is updated. When updating the window, the debugger
Chapter 4: Viewing Code and Data
Displaying Program Context
147
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