get linked to nm.h, xm.h, and tm.h respectively by configure,
moved to appropriate config/<cpu> subdirectory.
* nm-sysv4.h, xm-sysv4.h, tm-sysv4.h, tm-sunos.h, nm-trash.h:
Native, host, and target files that are common across more than
one cpu architecture and included by one of the configured
native, host, or target files, get moved to config directory.
frame. Use find_return_regnum to find the caller.
* (find_unwind_entry): New routine to locate stack frame info
associated with a procedure. This looks in the $UNWIND_START$
section in the SOM file.
* (find_return_regnum): New routine. Uses find_unwind_entry() to
figure out where the caller's return address is stored.
* (find_proc_framesize): New routine. Uses find_unwind_entry()
to figure out the frame size for a procedure.
* (saved_pc_after_call): New routine, moved from tm-hppa.h.
* (init_extra_frame_info): New routine. Corrects PC and FP for
outermost frame if necessary.
* (frame_chain): New routine, moved from tm-hppa.h.
* (skip_trampoline_code): Handle computed function calls (ie:
calls from $$dyncall).
* (unwind_command): Temporary support function to allow user
to control/observe aspects of the unwind (stack frame) info.
* infcmd.c (read_pc): (Temporary), put a hack in to see if the PC
was in a system call, if so, then read the PC from r31.
* tm-hppah.h (SKIP_TRAMPOLINE_CODE, IN_SOLIB_TRAMPOLINE): Deal
with extra arg for skip_trampoline_code().
* (INIT_EXTRA_FRAME_INFO): Define to point at subr (see above).
* (FRAME_CHAIN, FRAME_CHAIN_VALID): Turn into real subroutines.
* tm-hppa.h (SAVED_PC_AFTER_CALL): Turn into real subroutine.
