Debugging with GDB Manual HP WDB v6.3 (5900-2180, August 2012)

NOTE:
• On the SPARC architecture, frame needs two addresses to select an arbitrary
frame: a frame pointer and a stack pointer.
• On the MIPS and Alpha architecture, it needs two addresses: a stack pointer
and a program counter.
• On the 29k architecture, it needs three addresses: a register stack pointer,
a program counter, and a memory stack pointer.
up n Move n frames up the stack. For positive numbers n, this advances toward the
outermost frame, to higher frame numbers, to frames that have existed longer. n
defaults to one.
down n Move n frames down the stack. For positive numbers n, this advances toward
the innermost frame, to lower frame numbers, to frames that were created more
recently. n defaults to one. You may abbreviate down as do.
All of these commands end by printing two lines of output describing the frame. The first line shows
the frame number, the function name, the arguments, and the source file and line number of
execution in that frame. The second line shows the text of that source line.
For example:
((gdb)) up
#1 0x22f0 in main (argc=1, argv=0xf7fffbf4, env=0xf7fffbfc)
at env.c:10
10 read_input_file (argv[i]);
After such a printout, the list command with no arguments prints ten lines centered on the point
of execution in the frame. See “Printing source lines” (page 59).
up-silently n,
down-silently n
These two commands are variants of up and down, respectively; they
differ in that they do their work silently, without causing display of the
new frame. They are intended primarily for use in GDB command scripts,
where the output might be unnecessary and distracting.
6.6 Information about a frame
The following commands are used to print information about the selected stack frame:
frame, f When used without any argument, this command does not change which
frame is selected, but prints a brief description of the currently selected
stack frame. It can be abbreviated f. With an argument, this command
is used to select a stack frame. See “Selecting a frame” (page 56).
info frame, info
f
This command prints a verbose description of the selected stack frame,
including:
• the address of the frame
• the address of the next frame down (called by this frame)
• the address of the next frame up (caller of this frame)
• the language in which the source code corresponding to this frame
is written
• the address of the frame's arguments
• the address of the frame's local variables
• the program counter saved in it (the address of execution in the caller
frame)
• which registers were saved in the frame
6.6 Information about a frame 57