src/compiler/ppc/sap.lisp

   1 ;;;; the PPC VM definition of SAP operations
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11
  12 (in-package "SB!VM")
  13
  14 \f
  15 ;;;; Moves and coercions:
  16
  17 ;;; Move a tagged SAP to an untagged representation.
  18 (define-vop (move-to-sap)
  19   (:args (x :scs (any-reg descriptor-reg)))
  20   (:results (y :scs (sap-reg)))
  21   (:note "pointer to SAP coercion")
  22   (:generator 1
  23     (loadw y x sap-pointer-slot other-pointer-lowtag)))
  24
  25 (define-move-vop move-to-sap :move
  26   (descriptor-reg) (sap-reg))
  27
  28
  29 ;;; Move an untagged SAP to a tagged representation.
  30 (define-vop (move-from-sap)
  31   (:args (sap :scs (sap-reg) :to :save))
  32   (:temporary (:scs (non-descriptor-reg)) ndescr)
  33   (:temporary (:sc non-descriptor-reg :offset nl3-offset) pa-flag)
  34   (:results (res :scs (descriptor-reg)))
  35   (:note "SAP to pointer coercion")
  36   (:generator 20
  37     (with-fixed-allocation (res pa-flag ndescr sap-widetag sap-size)
  38       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  39
  40 (define-move-vop move-from-sap :move
  41   (sap-reg) (descriptor-reg))
  42
  43 ;;; Move untagged sap values.
  44 (define-vop (sap-move)
  45   (:args (x :target y
  46             :scs (sap-reg)
  47             :load-if (not (location= x y))))
  48   (:results (y :scs (sap-reg)
  49                :load-if (not (location= x y))))
  50   (:note "SAP move")
  51   (:effects)
  52   (:affected)
  53   (:generator 0
  54     (move y x)))
  55
  56 (define-move-vop sap-move :move
  57   (sap-reg) (sap-reg))
  58
  59
  60 ;;; Move untagged sap arguments/return-values.
  61 (define-vop (move-sap-arg)
  62   (:args (x :target y
  63             :scs (sap-reg))
  64          (fp :scs (any-reg)
  65              :load-if (not (sc-is y sap-reg))))
  66   (:results (y))
  67   (:note "SAP argument move")
  68   (:generator 0
  69     (sc-case y
  70       (sap-reg
  71        (move y x))
  72       (sap-stack
  73        (storew x fp (tn-offset y))))))
  74
  75 (define-move-vop move-sap-arg :move-arg
  76   (descriptor-reg sap-reg) (sap-reg))
  77
  78 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
  79 ;;; descriptor passing location.
  80 (define-move-vop move-arg :move-arg
  81   (sap-reg) (descriptor-reg))
  82 \f
  83 ;;;; SAP-INT and INT-SAP
  84 (define-vop (sap-int)
  85   (:args (sap :scs (sap-reg) :target int))
  86   (:arg-types system-area-pointer)
  87   (:results (int :scs (unsigned-reg)))
  88   (:result-types unsigned-num)
  89   (:translate sap-int)
  90   (:policy :fast-safe)
  91   (:generator 1
  92     (move int sap)))
  93
  94 (define-vop (int-sap)
  95   (:args (int :scs (unsigned-reg) :target sap))
  96   (:arg-types unsigned-num)
  97   (:results (sap :scs (sap-reg)))
  98   (:result-types system-area-pointer)
  99   (:translate int-sap)
 100   (:policy :fast-safe)
 101   (:generator 1
 102     (move sap int)))
 103 \f
 104 ;;;; POINTER+ and POINTER-
 105 (define-vop (pointer+)
 106   (:translate sap+)
 107   (:args (ptr :scs (sap-reg))
 108          (offset :scs (signed-reg)))
 109   (:arg-types system-area-pointer signed-num)
 110   (:results (res :scs (sap-reg)))
 111   (:result-types system-area-pointer)
 112   (:policy :fast-safe)
 113   (:generator 2
 114     (inst add res ptr offset)))
 115
 116 (define-vop (pointer+-c)
 117   (:translate sap+)
 118   (:args (ptr :scs (sap-reg)))
 119   (:info offset)
 120   (:arg-types system-area-pointer (:constant (signed-byte 16)))
 121   (:results (res :scs (sap-reg)))
 122   (:result-types system-area-pointer)
 123   (:policy :fast-safe)
 124   (:generator 1
 125     (inst addi res ptr offset)))
 126
 127 (define-vop (pointer-)
 128   (:translate sap-)
 129   (:args (ptr1 :scs (sap-reg))
 130          (ptr2 :scs (sap-reg)))
 131   (:arg-types system-area-pointer system-area-pointer)
 132   (:policy :fast-safe)
 133   (:results (res :scs (signed-reg)))
 134   (:result-types signed-num)
 135   (:generator 1
 136     (inst sub res ptr1 ptr2)))
 137 \f
 138 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 139 (macrolet ((def-system-ref-and-set
 140                (ref-name set-name sc type size &optional signed)
 141                (let ((ref-name-c (symbolicate ref-name "-C"))
 142                      (set-name-c (symbolicate set-name "-C")))
 143                  `(progn
 144                    (define-vop (,ref-name)
 145                        (:translate ,ref-name)
 146                      (:policy :fast-safe)
 147                      (:args (sap :scs (sap-reg))
 148                       (offset :scs (signed-reg)))
 149                      (:arg-types system-area-pointer signed-num)
 150                      (:results (result :scs (,sc)))
 151                      (:result-types ,type)
 152                      (:generator 5
 153                       (inst ,(ecase size
 154                                     (:byte 'lbzx)
 155                                     (:short (if signed 'lhax 'lhzx))
 156                                     (:long 'lwzx)
 157                                     (:single 'lfsx)
 158                                     (:double 'lfdx))
 159                             result sap offset)
 160                       ,@(when (and (eq size :byte) signed)
 161                               '((inst extsb result result)))))
 162                    (define-vop (,ref-name-c)
 163                        (:translate ,ref-name)
 164                      (:policy :fast-safe)
 165                      (:args (sap :scs (sap-reg)))
 166                      (:arg-types system-area-pointer (:constant (signed-byte 16)))
 167                      (:info offset)
 168                      (:results (result :scs (,sc)))
 169                      (:result-types ,type)
 170                      (:generator 4
 171                       (inst ,(ecase size
 172                                     (:byte 'lbz)
 173                                     (:short (if signed 'lha 'lhz))
 174                                     (:long 'lwz)
 175                                     (:single 'lfs)
 176                                     (:double 'lfd))
 177                             result sap offset)
 178                       ,@(when (and (eq size :byte) signed)
 179                               '((inst extsb result result)))))
 180                    (define-vop (,set-name)
 181                        (:translate ,set-name)
 182                      (:policy :fast-safe)
 183                      (:args (sap :scs (sap-reg))
 184                       (offset :scs (signed-reg))
 185                       (value :scs (,sc) :target result))
 186                      (:arg-types system-area-pointer signed-num ,type)
 187                      (:results (result :scs (,sc)))
 188                      (:result-types ,type)
 189                      (:generator 5
 190                       (inst ,(ecase size
 191                                     (:byte 'stbx)
 192                                     (:short 'sthx)
 193                                     (:long 'stwx)
 194                                     (:single 'stfsx)
 195                                     (:double 'stfdx))
 196                             value sap offset)
 197                       (unless (location= result value)
 198                         ,@(case size
 199                                 (:single
 200                                  '((inst frsp result value)))
 201                                 (:double
 202                                  '((inst fmr result value)))
 203                                 (t
 204                                  '((inst mr result value)))))))
 205                    (define-vop (,set-name-c)
 206                        (:translate ,set-name)
 207                      (:policy :fast-safe)
 208                      (:args (sap :scs (sap-reg))
 209                       (value :scs (,sc) :target result))
 210                      (:arg-types system-area-pointer (:constant (signed-byte 16)) ,type)
 211                      (:info offset)
 212                      (:results (result :scs (,sc)))
 213                      (:result-types ,type)
 214                      (:generator 4
 215                       (inst ,(ecase size
 216                                     (:byte 'stb)
 217                                     (:short 'sth)
 218                                     (:long 'stw)
 219                                     (:single 'stfs)
 220                                     (:double 'stfd))
 221                             value sap offset)
 222                       (unless (location= result value)
 223                         ,@(case size
 224                                 (:single
 225                                  '((inst frsp result value)))
 226                                 (:double
 227                                  '((inst fmr result value)))
 228                                 (t
 229                                  '((inst mr result value)))))))))))
 230   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 231     unsigned-reg positive-fixnum :byte nil)
 232   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 233     signed-reg tagged-num :byte t)
 234   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 235     unsigned-reg positive-fixnum :short nil)
 236   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 237     signed-reg tagged-num :short t)
 238   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 239     unsigned-reg unsigned-num :long nil)
 240   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 241     signed-reg signed-num :long t)
 242   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 243     sap-reg system-area-pointer :long)
 244   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 245     single-reg single-float :single)
 246   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 247     double-reg double-float :double))
 248 \f
 249 ;;; Noise to convert normal lisp data objects into SAPs.
 250 (define-vop (vector-sap)
 251   (:translate vector-sap)
 252   (:policy :fast-safe)
 253   (:args (vector :scs (descriptor-reg)))
 254   (:results (sap :scs (sap-reg)))
 255   (:result-types system-area-pointer)
 256   (:generator 2
 257     (inst addi sap vector
 258           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))