obp/obp/cpu/sparc/cpustate.fth

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id: @(#)cpustate.fth 2.11 99/04/16
purpose: Buffers for saving program state
copyright: Copyright 1990 Sun Microsystems, Inc.  All Rights Reserved

\ cpustate.fth 2.9 94/08/25
\ Copyright 1985-1990 Bradley Forthware

headers
\ Data structures defining the CPU state saved by a breakpoint trap.
\ This must be loaded before either catchexc.fth or register.fth,
\ and is the complete interface between those 2 modules.

\ Offset into the register save array of the window register save area.
\ During compilation, we use this as an allocation pointer for the
\ global register save area, and then when we're finished allocating
\ global registers, it's final value will be the offset to the the
\ window register save area.
headerless
0 value window-registers

headers
\ A place to save the CPU registers when we take a trap
defer cpu-state ( -- adr ) ' 0 to cpu-state \ Pointer to CPU state save area

\ Compile-time allocator for saved register space
transient
: allocate-reg  ( -- offset )
   window-registers  dup na1+  to window-registers
;
resident

headerless
: >state  ( offset -- adr )  cpu-state  +  ;

h# 40 constant ua-size

0 value pssave          \ A place to save the Forth data stack
0 value rssave          \ A place to save the Forth return stack

headers
defer .exception        \ Display the exception type
defer handle-breakpoint \ What to do after saving the state
8 constant #windows     \ # of windows implemented