src/compiler/mips/sap.lisp

   1 ;;;; the MIPS 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 \f
  14 ;;;; Moves and coercions:
  15
  16 ;;; Move a tagged SAP to an untagged representation.
  17 (define-vop (move-to-sap)
  18   (:args (x :scs (any-reg descriptor-reg)))
  19   (:results (y :scs (sap-reg)))
  20   (:note "pointer to SAP coercion")
  21   (:generator 1
  22     (loadw y x sap-pointer-slot other-pointer-lowtag)))
  23
  24 (define-move-vop move-to-sap :move
  25   (descriptor-reg) (sap-reg))
  26
  27 ;;; Move an untagged SAP to a tagged representation.
  28 (define-vop (move-from-sap)
  29   (:args (sap :scs (sap-reg) :to :save))
  30   (:temporary (:scs (non-descriptor-reg)) ndescr)
  31   (:temporary (:sc non-descriptor-reg :offset nl4-offset) pa-flag)
  32   (:results (res :scs (descriptor-reg)))
  33   (:note "SAP to pointer coercion")
  34   (:generator 20
  35     (with-fixed-allocation (res pa-flag ndescr sap-widetag sap-size nil)
  36       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  37
  38 (define-move-vop move-from-sap :move
  39   (sap-reg) (descriptor-reg))
  40
  41 ;;; Move untagged SAP values.
  42 (define-vop (sap-move)
  43   (:args (x :target y
  44             :scs (sap-reg)
  45             :load-if (not (location= x y))))
  46   (:results (y :scs (sap-reg)
  47                :load-if (not (location= x y))))
  48   (:note "SAP move")
  49   (:effects)
  50   (:affected)
  51   (:generator 0
  52     (move y x)))
  53
  54 (define-move-vop sap-move :move
  55   (sap-reg) (sap-reg))
  56
  57 ;;; Move untagged SAP arguments/return-values.
  58 (define-vop (move-sap-arg)
  59   (:args (x :target y
  60             :scs (sap-reg))
  61          (fp :scs (any-reg)
  62              :load-if (not (sc-is y sap-reg))))
  63   (:results (y))
  64   (:note "SAP argument move")
  65   (:generator 0
  66     (sc-case y
  67       (sap-reg
  68        (move y x))
  69       (sap-stack
  70        (storew x fp (tn-offset y))))))
  71
  72 (define-move-vop move-sap-arg :move-arg
  73   (descriptor-reg sap-reg) (sap-reg))
  74
  75 ;;; Use standard MOVE-ARG + coercion to move an untagged SAP to a
  76 ;;; descriptor passing location.
  77 (define-move-vop move-arg :move-arg
  78   (sap-reg) (descriptor-reg))
  79 \f
  80 ;;;; SAP-INT and INT-SAP
  81
  82 ;;; The function SAP-INT is used to generate an integer corresponding
  83 ;;; to the system area pointer, suitable for passing to the kernel
  84 ;;; interfaces (which want all addresses specified as integers). The
  85 ;;; function INT-SAP is used to do the opposite conversion. The
  86 ;;; integer representation of a SAP is the byte offset of the SAP from
  87 ;;; the start of the address space.
  88 (define-vop (sap-int)
  89   (:args (sap :scs (sap-reg) :target int))
  90   (:arg-types system-area-pointer)
  91   (:results (int :scs (unsigned-reg)))
  92   (:result-types unsigned-num)
  93   (:translate sap-int)
  94   (:policy :fast-safe)
  95   (:generator 1
  96     (move int sap)))
  97
  98 (define-vop (int-sap)
  99   (:args (int :scs (unsigned-reg) :target sap))
 100   (:arg-types unsigned-num)
 101   (:results (sap :scs (sap-reg)))
 102   (:result-types system-area-pointer)
 103   (:translate int-sap)
 104   (:policy :fast-safe)
 105   (:generator 1
 106     (move sap int)))
 107 \f
 108 ;;;; POINTER+ and POINTER-
 109 (define-vop (pointer+)
 110   (:translate sap+)
 111   (:args (ptr :scs (sap-reg))
 112          (offset :scs (signed-reg immediate)))
 113   (:arg-types system-area-pointer signed-num)
 114   (:results (res :scs (sap-reg)))
 115   (:result-types system-area-pointer)
 116   (:policy :fast-safe)
 117   (:generator 1
 118     (sc-case offset
 119       (signed-reg
 120        (inst addu res ptr offset))
 121       (immediate
 122        (inst addu res ptr (tn-value offset))))))
 123
 124 (define-vop (pointer-)
 125   (:translate sap-)
 126   (:args (ptr1 :scs (sap-reg))
 127          (ptr2 :scs (sap-reg)))
 128   (:arg-types system-area-pointer system-area-pointer)
 129   (:policy :fast-safe)
 130   (:results (res :scs (signed-reg)))
 131   (:result-types signed-num)
 132   (:generator 1
 133     (inst subu res ptr1 ptr2)))
 134 \f
 135 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 136 (macrolet ((def-system-ref-and-set
 137           (ref-name set-name sc type size &optional signed)
 138   (let ((ref-name-c (symbolicate ref-name "-C"))
 139         (set-name-c (symbolicate set-name "-C")))
 140     `(progn
 141        (define-vop (,ref-name)
 142          (:translate ,ref-name)
 143          (:policy :fast-safe)
 144          (:args (object :scs (sap-reg) :target sap)
 145                 (offset :scs (signed-reg)))
 146          (:arg-types system-area-pointer signed-num)
 147          (:results (result :scs (,sc)))
 148          (:result-types ,type)
 149          (:temporary (:scs (sap-reg) :from (:argument 0)) sap)
 150          (:generator 5
 151            (inst addu sap object offset)
 152            ,@(ecase size
 153                (:byte
 154                 (if signed
 155                     '((inst lb result sap 0))
 156                     '((inst lbu result sap 0))))
 157                  (:short
 158                   (if signed
 159                       '((inst lh result sap 0))
 160                       '((inst lhu result sap 0))))
 161                  (:long
 162                   '((inst lw result sap 0)))
 163                  (:single
 164                   '((inst lwc1 result sap 0)))
 165                  (:double
 166                   (ecase *backend-byte-order*
 167                     (:big-endian
 168                      '((inst lwc1 result sap n-word-bytes)
 169                        (inst lwc1-odd result sap 0)))
 170                     (:little-endian
 171                      '((inst lwc1 result sap 0)
 172                        (inst lwc1-odd result sap n-word-bytes))))))
 173            (inst nop)))
 174        (define-vop (,ref-name-c)
 175          (:translate ,ref-name)
 176          (:policy :fast-safe)
 177          (:args (object :scs (sap-reg)))
 178          (:arg-types system-area-pointer
 179                      (:constant ,(if (eq size :double)
 180                                      ;; We need to be able to add 4.
 181                                      `(integer ,(- (ash 1 16))
 182                                                ,(- (ash 1 16) 5))
 183                                      '(signed-byte 16))))
 184          (:info offset)
 185          (:results (result :scs (,sc)))
 186          (:result-types ,type)
 187          (:generator 4
 188            ,@(ecase size
 189                (:byte
 190                 (if signed
 191                     '((inst lb result object offset))
 192                     '((inst lbu result object offset))))
 193                (:short
 194                 (if signed
 195                     '((inst lh result object offset))
 196                     '((inst lhu result object offset))))
 197                (:long
 198                 '((inst lw result object offset)))
 199                (:single
 200                 '((inst lwc1 result object offset)))
 201                (:double
 202                 (ecase *backend-byte-order*
 203                   (:big-endian
 204                    '((inst lwc1 result object (+ offset n-word-bytes))
 205                      (inst lwc1-odd result object offset)))
 206                   (:little-endian
 207                    '((inst lwc1 result object offset)
 208                      (inst lwc1-odd result object (+ offset n-word-bytes)))))))
 209            (inst nop)))
 210        (define-vop (,set-name)
 211          (:translate ,set-name)
 212          (:policy :fast-safe)
 213          (:args (object :scs (sap-reg) :target sap)
 214                 (offset :scs (signed-reg))
 215                 (value :scs (,sc) :target result))
 216          (:arg-types system-area-pointer signed-num ,type)
 217          (:results (result :scs (,sc)))
 218          (:result-types ,type)
 219          (:temporary (:scs (sap-reg) :from (:argument 0)) sap)
 220          (:generator 5
 221            (inst addu sap object offset)
 222            ,@(ecase size
 223                (:byte
 224                 '((inst sb value sap 0)
 225                   (move result value)))
 226                (:short
 227                 '((inst sh value sap 0)
 228                   (move result value)))
 229                (:long
 230                 '((inst sw value sap 0)
 231                   (move result value)))
 232                (:single
 233                 '((inst swc1 value sap 0)
 234                   (unless (location= result value)
 235                     (inst fmove :single result value))))
 236                (:double
 237                 (ecase *backend-byte-order*
 238                   (:big-endian
 239                    '((inst swc1 value sap n-word-bytes)
 240                      (inst swc1-odd value sap 0)
 241                      (unless (location= result value)
 242                        (inst fmove :double result value))))
 243                   (:little-endian
 244                    '((inst swc1 value sap 0)
 245                      (inst swc1-odd value sap n-word-bytes)
 246                      (unless (location= result value)
 247                        (inst fmove :double result value)))))))))
 248        (define-vop (,set-name-c)
 249          (:translate ,set-name)
 250          (:policy :fast-safe)
 251          (:args (object :scs (sap-reg))
 252                 (value :scs (,sc) :target result))
 253          (:arg-types system-area-pointer
 254                      (:constant ,(if (eq size :double)
 255                                      ;; We need to be able to add 4.
 256                                      `(integer ,(- (ash 1 16))
 257                                                ,(- (ash 1 16) 5))
 258                                      '(signed-byte 16)))
 259                      ,type)
 260          (:info offset)
 261          (:results (result :scs (,sc)))
 262          (:result-types ,type)
 263          (:generator 4
 264            ,@(ecase size
 265                (:byte
 266                 '((inst sb value object offset)
 267                   (move result value)))
 268                (:short
 269                 '((inst sh value object offset)
 270                   (move result value)))
 271                (:long
 272                 '((inst sw value object offset)
 273                   (move result value)))
 274                (:single
 275                 '((inst swc1 value object offset)
 276                   (unless (location= result value)
 277                     (inst fmove :single result value))))
 278                (:double
 279                 (ecase *backend-byte-order*
 280                   (:big-endian
 281                    '((inst swc1 value object (+ offset n-word-bytes))
 282                      (inst swc1-odd value object (+ offset n-word-bytes))
 283                      (unless (location= result value)
 284                        (inst fmove :double result value))))
 285                   (:little-endian
 286                    '((inst swc1 value object offset)
 287                      (inst swc1-odd value object (+ offset n-word-bytes))
 288                      (unless (location= result value)
 289                        (inst fmove :double result value)))))))))))))
 290   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 291     unsigned-reg positive-fixnum :byte nil)
 292   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 293     signed-reg tagged-num :byte t)
 294   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 295     unsigned-reg positive-fixnum :short nil)
 296   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 297     signed-reg tagged-num :short t)
 298   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 299     unsigned-reg unsigned-num :long nil)
 300   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 301     signed-reg signed-num :long t)
 302   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 303     sap-reg system-area-pointer :long)
 304   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 305     single-reg single-float :single)
 306   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 307     double-reg double-float :double))
 308 \f
 309 ;;; Noise to convert normal lisp data objects into SAPs.
 310 (define-vop (vector-sap)
 311   (:translate vector-sap)
 312   (:policy :fast-safe)
 313   (:args (vector :scs (descriptor-reg)))
 314   (:results (sap :scs (sap-reg)))
 315   (:result-types system-area-pointer)
 316   (:generator 2
 317     (inst addu sap vector
 318           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))
 319 \f
 320 ;;; Transforms for 64-bit SAP accessors.
 321 #!+little-endian
 322 (progn
 323   (deftransform sap-ref-64 ((sap offset) (* *))
 324     '(logior (sap-ref-32 sap offset)
 325              (ash (sap-ref-32 sap (+ offset 4)) 32)))
 326
 327   (deftransform signed-sap-ref-64 ((sap offset) (* *))
 328     '(logior (sap-ref-32 sap offset)
 329              (ash (signed-sap-ref-32 sap (+ offset 4)) 32)))
 330
 331   (deftransform %set-sap-ref-64 ((sap offset value) (* * *))
 332     '(progn
 333        (%set-sap-ref-32 sap offset (logand value #xffffffff))
 334        (%set-sap-ref-32 sap (+ offset 4) (ash value -32))))
 335
 336   (deftransform %set-signed-sap-ref-64 ((sap offset value) (* * *))
 337     '(progn
 338        (%set-sap-ref-32 sap offset (logand value #xffffffff))
 339        (%set-signed-sap-ref-32 sap (+ offset 4) (ash value -32)))))
 340
 341 #!-little-endian
 342 (progn
 343   (deftransform sap-ref-64 ((sap offset) (* *))
 344     '(logior (ash (sap-ref-32 sap offset) 32)
 345              (sap-ref-32 sap (+ offset 4))))
 346
 347   (deftransform signed-sap-ref-64 ((sap offset) (* *))
 348     '(logior (ash (signed-sap-ref-32 sap offset) 32)
 349              (sap-ref-32 sap (+ 4 offset))))
 350
 351   (deftransform %set-sap-ref-64 ((sap offset value) (* * *))
 352     '(progn
 353        (%set-sap-ref-32 sap offset (ash value -32))
 354        (%set-sap-ref-32 sap (+ offset 4) (logand value #xffffffff))))
 355
 356   (deftransform %set-signed-sap-ref-64 ((sap offset value) (* * *))
 357     '(progn
 358        (%set-signed-sap-ref-32 sap offset (ash value -32))
 359        (%set-sap-ref-32 sap (+ 4 offset) (logand value #xffffffff)))))