How do I get at the current stack pointer?

[Andrew Cagney]

> Hi!
> 
> We are developing a virtual machine for Java.  On Linux/IA64, the stack lay out for the methods we have generated is different from that of compiled C code.  Thus, when walking the stack, in a back trace for example, GDB can step into one of our stack frames, but on the way out it gets confused.
> 
> We are trying to solve this problem by adding some code to get_prev_frame() in blockframe.c, that:
> 
> * Checks the inferior for a stack walking helper function.
> * If it exists, calls the function with the current pc and the current stack pointer (bsp).  It returns the stack pointer (bsp) and pc for the previous frame.
> 
> I have two questions about this.  First, does this seem like a reasonable solution, or do you think there is an easier way for us to do this?
> 
> Second, if I have a struct frame_info *, how do I get a stack pointer out of it?  I get the pc using gdbarch_frame_saved_pc() but I can't seem to find a similar function for accessing the stack pointer.

Just a guess.  What does scheme do?

Andrew