src/compiler/arm/sap.lisp

   1 ;;;; the ARM 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 (:sc non-descriptor-reg :offset ocfp-offset) pa-flag)
  33   (:results (res :scs (descriptor-reg)))
  34   (:note "SAP to pointer coercion")
  35   (:generator 20
  36     (with-fixed-allocation (res pa-flag sap-widetag sap-size)
  37       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  38
  39 (define-move-vop move-from-sap :move
  40   (sap-reg) (descriptor-reg))
  41
  42 ;;; Move untagged sap values.
  43 (define-vop (sap-move)
  44   (:args (x :target y
  45             :scs (sap-reg)
  46             :load-if (not (location= x y))))
  47   (:results (y :scs (sap-reg)
  48                :load-if (not (location= x y))))
  49   (:note "SAP move")
  50   (:effects)
  51   (:affected)
  52   (:generator 0
  53     (move y x)))
  54
  55 (define-move-vop sap-move :move
  56   (sap-reg) (sap-reg))
  57
  58
  59 ;;; Move untagged sap arguments/return-values.
  60 (define-vop (move-sap-arg)
  61   (:args (x :target y
  62             :scs (sap-reg))
  63          (fp :scs (any-reg)
  64              :load-if (not (sc-is y sap-reg))))
  65   (:results (y))
  66   (:note "SAP argument move")
  67   (:generator 0
  68     (sc-case y
  69       (sap-reg
  70        (move y x))
  71       (sap-stack
  72        (store-stack-offset x fp y)))))
  73
  74 (define-move-vop move-sap-arg :move-arg
  75   (descriptor-reg sap-reg) (sap-reg))
  76
  77 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
  78 ;;; descriptor passing location.
  79 (define-move-vop move-arg :move-arg
  80   (sap-reg) (descriptor-reg))
  81 \f
  82 ;;;; SAP-INT and INT-SAP
  83 (define-vop (sap-int)
  84   (:args (sap :scs (sap-reg) :target int))
  85   (:arg-types system-area-pointer)
  86   (:results (int :scs (unsigned-reg)))
  87   (:result-types unsigned-num)
  88   (:translate sap-int)
  89   (:policy :fast-safe)
  90   (:generator 1
  91     (move int sap)))
  92
  93 (define-vop (int-sap)
  94   (:args (int :scs (unsigned-reg) :target sap))
  95   (:arg-types unsigned-num)
  96   (:results (sap :scs (sap-reg)))
  97   (:result-types system-area-pointer)
  98   (:translate int-sap)
  99   (:policy :fast-safe)
 100   (:generator 1
 101     (move sap int)))
 102 \f
 103 ;;;; POINTER+ and POINTER-
 104 (define-vop (pointer+)
 105   (:translate sap+)
 106   (:args (ptr :scs (sap-reg))
 107          (offset :scs (signed-reg)))
 108   (:arg-types system-area-pointer signed-num)
 109   (:results (res :scs (sap-reg)))
 110   (:result-types system-area-pointer)
 111   (:policy :fast-safe)
 112   (:generator 2
 113     (inst add res ptr offset)))
 114
 115 (define-vop (pointer+-unsigned-c)
 116   (:translate sap+)
 117   (:args (ptr :scs (sap-reg)))
 118   (:info offset)
 119   (:arg-types system-area-pointer (:constant (unsigned-byte 8)))
 120   (:results (res :scs (sap-reg)))
 121   (:result-types system-area-pointer)
 122   (:policy :fast-safe)
 123   (:generator 1
 124     (inst add res ptr offset)))
 125
 126 (define-vop (pointer+-signed-c)
 127   (:translate sap+)
 128   (:args (ptr :scs (sap-reg)))
 129   (:info offset)
 130   (:arg-types system-area-pointer (:constant (integer -255 -1)))
 131   (:results (res :scs (sap-reg)))
 132   (:result-types system-area-pointer)
 133   (:policy :fast-safe)
 134   (:generator 1
 135     (inst sub res ptr (- offset))))
 136
 137 (define-vop (pointer-)
 138   (:translate sap-)
 139   (:args (ptr1 :scs (sap-reg))
 140          (ptr2 :scs (sap-reg)))
 141   (:arg-types system-area-pointer system-area-pointer)
 142   (:policy :fast-safe)
 143   (:results (res :scs (signed-reg)))
 144   (:result-types signed-num)
 145   (:generator 1
 146     (inst sub res ptr1 ptr2)))
 147 \f
 148 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 149 (macrolet ((def-system-ref-and-set
 150                ;; NOTE: The -C VOPs have been disabled, as the allowed
 151                ;; displacements for memory references vary by
 152                ;; instruction, are confusing to figure out, and might
 153                ;; be sign-magnitude encoded.  FIXME: Figure these
 154                ;; things out, and re-enable the VOPs.
 155                (ref-name set-name sc type size &key signed use-lip)
 156                (let ((ref-name-c (symbolicate ref-name "-C"))
 157                      (set-name-c (symbolicate set-name "-C")))
 158                  (declare (ignorable ref-name-c set-name-c))
 159                  `(progn
 160                    (define-vop (,ref-name)
 161                        (:translate ,ref-name)
 162                      (:policy :fast-safe)
 163                      (:args (sap :scs (sap-reg))
 164                       (offset :scs (signed-reg)))
 165                      (:arg-types system-area-pointer signed-num)
 166                      (:results (result :scs (,sc)))
 167                      (:result-types ,type)
 168                      ,@(when use-lip
 169                              '((:temporary (:sc interior-reg) lip)))
 170                      (:generator 5
 171                       ,@(when use-lip
 172                           '((inst add lip sap offset)))
 173                       (inst ,(ecase size
 174                                     (:byte (if signed 'ldrsb 'ldrb))
 175                                     (:short (if signed 'ldrsh 'ldrh))
 176                                     (:long 'ldr)
 177                                     (:single 'flds)
 178                                     (:double 'fldd))
 179                             result ,(if use-lip
 180                                         '(@ lip)
 181                                         '(@ sap offset)))))
 182                    #+(or)
 183                    (define-vop (,ref-name-c)
 184                        (:translate ,ref-name)
 185                      (:policy :fast-safe)
 186                      (:args (sap :scs (sap-reg)))
 187                      (:arg-types system-area-pointer (:constant (signed-byte 16)))
 188                      (:info offset)
 189                      (:results (result :scs (,sc)))
 190                      (:result-types ,type)
 191                      (:generator 4
 192                       (inst ,(ecase size
 193                                     (:byte (if signed 'ldrsb 'ldrb))
 194                                     (:short (if signed 'ldrsh 'ldrh))
 195                                     (:long 'ldr)
 196                                     (:single 'flds)
 197                                     (:double 'fldd))
 198                             result (@ sap offset))))
 199                    (define-vop (,set-name)
 200                        (:translate ,set-name)
 201                      (:policy :fast-safe)
 202                      (:args (sap :scs (sap-reg))
 203                       (offset :scs (signed-reg))
 204                       (value :scs (,sc) :target result))
 205                      (:arg-types system-area-pointer signed-num ,type)
 206                      (:results (result :scs (,sc)))
 207                      (:result-types ,type)
 208                      ,@(when use-lip
 209                              '((:temporary (:sc interior-reg) lip)))
 210                      (:generator 5
 211                       ,@(when use-lip
 212                           '((inst add lip sap offset)))
 213                       (inst ,(ecase size
 214                                     (:byte 'strb)
 215                                     (:short 'strh)
 216                                     (:long 'str)
 217                                     (:single 'fsts)
 218                                     (:double 'fstd))
 219                             value ,(if use-lip
 220                                        '(@ lip)
 221                                        '(@ sap offset)))
 222                       (unless (location= result value)
 223                         ,@(case size
 224                                 (:single
 225                                  '((inst fcpys result value)))
 226                                 (:double
 227                                  '((inst fcpyd result value)))
 228                                 (t
 229                                  '((inst mov result value)))))))
 230                    #+(or)
 231                    (define-vop (,set-name-c)
 232                        (:translate ,set-name)
 233                      (:policy :fast-safe)
 234                      (:args (sap :scs (sap-reg))
 235                       (value :scs (,sc) :target result))
 236                      (:arg-types system-area-pointer (:constant (signed-byte 16)) ,type)
 237                      (:info offset)
 238                      (:results (result :scs (,sc)))
 239                      (:result-types ,type)
 240                      (:generator 4
 241                       (inst ,(ecase size
 242                                     (:byte 'strb)
 243                                     (:short 'strh)
 244                                     (:long 'str)
 245                                     (:single 'fsts)
 246                                     (:double 'fstd))
 247                             value (@ sap offset))
 248                       (unless (location= result value)
 249                         ,@(case size
 250                                 (:single
 251                                  '((inst fcpys result value)))
 252                                 (:double
 253                                  '((inst fcpyd result value)))
 254                                 (t
 255                                  '((inst mov result value)))))))))))
 256   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 257     unsigned-reg positive-fixnum :byte :signed nil)
 258   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 259     signed-reg tagged-num :byte :signed t)
 260   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 261     unsigned-reg positive-fixnum :short :signed nil)
 262   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 263     signed-reg tagged-num :short :signed t)
 264   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 265     unsigned-reg unsigned-num :long :signed nil)
 266   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 267     signed-reg signed-num :long :signed t)
 268   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 269     sap-reg system-area-pointer :long)
 270   (def-system-ref-and-set sap-ref-lispobj %set-sap-ref-lispobj
 271     descriptor-reg * :long)
 272   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 273     single-reg single-float :single :use-lip t)
 274   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 275     double-reg double-float :double :use-lip t))
 276 \f
 277 ;;; Noise to convert normal lisp data objects into SAPs.
 278 (define-vop (vector-sap)
 279   (:translate vector-sap)
 280   (:policy :fast-safe)
 281   (:args (vector :scs (descriptor-reg)))
 282   (:results (sap :scs (sap-reg)))
 283   (:result-types system-area-pointer)
 284   (:generator 2
 285     (inst add sap vector
 286           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))