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; SPARC32 CPU description.  -*- Scheme -*-
; This file contains elements specific to sparc32.
; Copyright (C) 2000 Red Hat, Inc.
; This file is part of CGEN.
; See file COPYING.CGEN for details.

; Notes:
; - sparc64 support wip
; - fp support todo
; - source file layout wip
; - cpu family layout wip

; ??? For the nonce there is one cpu family to cover all 32 bit sparcs.
; It's not clear this will work, but following the goal of incremental
; complication ....

(define-cpu
  (name sparc32)
  (comment "SPARC 32 bit architecture")
  (endian big)
  (word-bitsize 32)
  ; Generated files have a "32" suffix.
  (file-transform "32")
)

(define-mach
  (name sparc-v8)
  (comment "sparc v8")
  (cpu sparc32)
  (bfd-name "sparc")
)

(define-mach
  (name sparclite)
  (comment "Fujitsu sparclite")
  (cpu sparc32)
  (bfd-name "sparc_sparclite")
)

; sparc32 models

(define-model
  (name sparc32-def)
  (comment "sparc32 default")
  (attrs)
  (mach sparc-v8)
  ; wip
  (pipeline p-foo "" () ((fetch) (decode) (execute) (memory) (writeback)))
  (unit u-exec "Execution Unit" ()
        1 1 ; issue done
        () () () ())
)

; sparc32 enums of opcodes, special insn values, etc.

; sparc32 hardware pieces.

; ??? impl,ver are left as part of h-psr (change maybe later)
(define-hardware
  (name h-psr)
  (comment "psr register")
  (type register USI)
  (get () (c-call USI "@cpu@_get_h_psr_handler"))
  (set (newval) (c-call VOID "@cpu@_set_h_psr_handler" newval))
)

(dsh h-s "supervisor bit" () (register BI))
(dsh h-ps "previous supervisor bit" () (register BI))

(dsh h-pil "processor interrupt level" () (register UQI))

(dsh h-et "enable traps bit" () (register BI))

(define-hardware
  (name h-tbr)
  (comment "trap base register")
  (type register WI)
  ;CPU (h_tbr) = (CPU (h_tbr) & 0xff0) | ((newval) & 0xfffff000);
  (set (newval) (set (raw-reg WI h-tbr)
                     (or WI (and WI (raw-reg WI h-tbr) (const #xff0))
                          (and WI newval (const #xfffff000)))))
)

(define-hardware
  (name h-cwp)
  (comment "current window pointer")
  (type register UQI)
  (set (newval) (c-call VOID "@cpu@_set_h_cwp_handler" newval))
)

(define-hardware
  (name h-wim)
  (comment "window invalid mask")
  (type register USI)
  ; ??? These just put ideas down so I can play with them.  Ignore.
  ;(get (value index) (and SI value (c-code SI "((1 << NWINDOWS) - 1)")))
  ;(get (self mode index insn)
  ;     (c-code USI "(CPU (h_wim) & ((1 << NWINDOWS) - 1))"))
  ;(set (self mode index insn newval)
  ;    (s-eval `(set SI ,self (and SI ,newval (const #xff)))))
  (get () (and (raw-reg USI h-wim)
               (sub (sll (const 1) (c-raw-call SI "GET_NWINDOWS")) (const 1))))
)

(dsh h-ag "alternate global indicator" () (register QI))

; Coprocessor support.

(dsh h-ec "enable coprocessor bit" () (register BI))

; Floating point support.
; wip.
; - currently evaluating the various possibilities

(dsh h-ef "enable fpu bit" () (register BI))

(dsh h-fsr "floating point status register" () (register USI))

; sparc32 instruction definitions.

; Special register move operations.

; %y is handled by the asr insns

(dni rd-asr "read asr" ()
     "rd $rdasr,$rd" ; note: `rdasr' is for ReaD asr, `rd' is for Reg Dest.
     (+ OP_2 OP3_RDASR rd rdasr (f-i 0) (f-simm13 0))
     (set rd rdasr)
     ())
(dni wr-asr "write asr" ()
     "wr $rs1,$rs2,$wrasr"
     (+ OP_2 OP3_WRASR wrasr rs1 rs2 (f-i 0) (f-res-asi 0))
     (set wrasr (xor rs1 rs2))
     ())
(dni wr-asr-imm "write-imm asr" ()
     "wr $rs1,$simm13,$wrasr"
     (+ OP_2 OP3_WRASR wrasr rs1 (f-i 1) simm13)
     (set wrasr (xor rs1 simm13))
     ())

(define-pmacro (rdwr-op name op3 asm-name reg-name)
  (begin
     (dni (.sym rd- name) (.str "read " name) ()
          (.str "rd " asm-name ",$rd")
          (+ OP_2 (.sym OP3_RD op3) rd (f-rs1 0) (f-i 0) (f-simm13 0))
          (set rd (reg WI reg-name))
          ())
     (dni (.sym wr- name) (.str "write " name) ()
          (.str "wr $rs1,$rs2," asm-name)
          (+ OP_2 (.sym OP3_WR op3) (f-rd 0) rs1 rs2 (f-i 0) (f-res-asi 0))
          (set (reg WI reg-name) (xor rs1 rs2))
          ())
     (dni (.sym wr- name -imm) (.str "write-imm " name) ()
          (.str "wr $rs1,$simm13," asm-name)
          (+ OP_2 (.sym OP3_WR op3) (f-rd 0) rs1 (f-i 1) simm13)
          (set (reg WI reg-name) (xor rs1 simm13))
          ())
     )
)

(rdwr-op psr PSR "%psr" h-psr)
(rdwr-op wim WIM "%wim" h-wim)
(rdwr-op tbr TBR "%tbr" h-tbr)

; TODO:
; - rdy,wry
; - stbar
; - flush
; - ldc, lddc, ldcsr, stc, stdc, stcsr, stdcq
; - cbccc, cpop