src/compiler/hppa/sap.lisp

   1 ;;;; the HPPA 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 "system area pointer indirection")
  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   (:results (res :scs (descriptor-reg)))
  32   (:note "system area pointer allocation")
  33   (:generator 20
  34     (with-fixed-allocation (res nil ndescr sap-widetag sap-size nil)
  35       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  36
  37 (define-move-vop move-from-sap :move
  38   (sap-reg) (descriptor-reg))
  39
  40 ;;; Move untagged sap values.
  41 (define-vop (sap-move)
  42   (:args (x :target y
  43             :scs (sap-reg)
  44             :load-if (not (location= x y))))
  45   (:results (y :scs (sap-reg)
  46                :load-if (not (location= x y))))
  47   (:note "SAP move")
  48   (:effects)
  49   (:affected)
  50   (:generator 0
  51     (move x y)))
  52
  53 (define-move-vop sap-move :move
  54   (sap-reg) (sap-reg))
  55
  56 ;;; Move untagged sap args/return-values.
  57 (define-vop (move-sap-arg)
  58   (:args (x :target y
  59             :scs (sap-reg))
  60          (fp :scs (any-reg)
  61              :load-if (not (sc-is y sap-reg))))
  62   (:results (y))
  63   (:note "SAP argument move")
  64   (:generator 0
  65     (sc-case y
  66       (sap-reg
  67        (move x y))
  68       (sap-stack
  69        (storew x fp (tn-offset y))))))
  70
  71 (define-move-vop move-sap-arg :move-arg
  72   (descriptor-reg sap-reg) (sap-reg))
  73
  74 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
  75 ;;; descriptor passing location.
  76 (define-move-vop move-arg :move-arg
  77   (sap-reg) (descriptor-reg))
  78 \f
  79 ;;;; SAP-INT and INT-SAP
  80 (define-vop (sap-int)
  81   (:args (sap :scs (sap-reg) :target int))
  82   (:arg-types system-area-pointer)
  83   (:results (int :scs (unsigned-reg)))
  84   (:result-types unsigned-num)
  85   (:translate sap-int)
  86   (:policy :fast-safe)
  87   (:generator 1
  88     (move sap int)))
  89
  90 (define-vop (int-sap)
  91   (:args (int :scs (unsigned-reg) :target sap))
  92   (:arg-types unsigned-num)
  93   (:results (sap :scs (sap-reg)))
  94   (:result-types system-area-pointer)
  95   (:translate int-sap)
  96   (:policy :fast-safe)
  97   (:generator 1
  98     (move int sap)))
  99 \f
 100 ;;;; POINTER+ and POINTER-
 101 (define-vop (pointer+)
 102   (:translate sap+)
 103   (:args (ptr :scs (sap-reg))
 104          (offset :scs (signed-reg immediate)))
 105   (:arg-types system-area-pointer signed-num)
 106   (:results (res :scs (sap-reg)))
 107   (:result-types system-area-pointer)
 108   (:policy :fast-safe)
 109   (:generator 1
 110     (sc-case offset
 111       (signed-reg
 112         (inst add ptr offset res))
 113       (immediate
 114         (cond
 115           ((and (< (tn-value offset) (ash 1 10))
 116                 (> (tn-value offset) (- (ash 1 10))))
 117             (inst addi (tn-value offset) ptr res))
 118           (t
 119             (inst li (tn-value offset) res)
 120             (inst add ptr res res)))))))
 121
 122 (define-vop (pointer-)
 123   (:translate sap-)
 124   (:args (ptr1 :scs (sap-reg))
 125          (ptr2 :scs (sap-reg)))
 126   (:arg-types system-area-pointer system-area-pointer)
 127   (:policy :fast-safe)
 128   (:results (res :scs (signed-reg)))
 129   (:result-types signed-num)
 130   (:generator 1
 131     (inst sub ptr1 ptr2 res)))
 132 \f
 133 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 134 (macrolet ((def-system-ref-and-set
 135           (ref-name set-name sc type size &optional signed)
 136   (let ((ref-name-c (symbolicate ref-name "-C"))
 137         (set-name-c (symbolicate set-name "-C")))
 138     `(progn
 139        (define-vop (,ref-name)
 140          (:translate ,ref-name)
 141          (:policy :fast-safe)
 142          (:args (object :scs (sap-reg))
 143                 (offset :scs (signed-reg)))
 144          (:arg-types system-area-pointer signed-num)
 145          (:results (result :scs (,sc)))
 146          (:result-types ,type)
 147          (:generator 5
 148            (inst ,(ecase size
 149                     (:byte 'ldbx)
 150                     (:short 'ldhx)
 151                     (:long 'ldwx)
 152                     (:float 'fldx))
 153                  offset object result)
 154            ,@(when (and signed (not (eq size :long)))
 155                `((inst extrs result 31 ,(ecase size
 156                           (:byte 8)
 157                           (:short 16))
 158                        result)))))
 159        (define-vop (,ref-name-c)
 160          (:translate ,ref-name)
 161          (:policy :fast-safe)
 162          (:args (object :scs (sap-reg)))
 163          (:arg-types system-area-pointer
 164                      (:constant ,(if (eq size :float)
 165                                      '(signed-byte 5)
 166                                      '(signed-byte 14))))
 167          (:info offset)
 168          (:results (result :scs (,sc)))
 169          (:result-types ,type)
 170          (:generator 4
 171            (inst ,(ecase size
 172                     (:byte 'ldb)
 173                     (:short 'ldh)
 174                     (:long 'ldw)
 175                     (:float 'flds))
 176                  offset object result)
 177            ,@(when (and signed (not (eq size :long)))
 178                `((inst extrs result 31 ,(ecase size
 179                           (:byte 8)
 180                           (:short 16))
 181                        result)))))
 182        (define-vop (,set-name)
 183          (:translate ,set-name)
 184          (:policy :fast-safe)
 185          (:args (object :scs (sap-reg)
 186                         ,@(unless (eq size :float) '(:target sap)))
 187                 (offset :scs (signed-reg))
 188                 (value :scs (,sc) :target result))
 189          (:arg-types system-area-pointer signed-num ,type)
 190          (:results (result :scs (,sc)))
 191          (:result-types ,type)
 192          ,@(unless (eq size :float)
 193              '((:temporary (:scs (sap-reg) :from (:argument 0)) sap)))
 194          (:generator 5
 195            ,@(if (eq size :float)
 196                  `((inst fstx value offset object)
 197                    (unless (location= value result)
 198                      (inst funop :copy value result)))
 199                  `((inst add object offset sap)
 200                    (inst ,(ecase size (:byte 'stb) (:short 'sth) (:long 'stw))
 201                          value 0 sap)
 202                    (move value result)))))
 203        (define-vop (,set-name-c)
 204          (:translate ,set-name)
 205          (:policy :fast-safe)
 206          (:args (object :scs (sap-reg))
 207                 (value :scs (,sc) :target result))
 208          (:arg-types system-area-pointer
 209                      (:constant ,(if (eq size :float)
 210                                      '(signed-byte 5)
 211                                      '(signed-byte 14)))
 212                      ,type)
 213          (:info offset)
 214          (:results (result :scs (,sc)))
 215          (:result-types ,type)
 216          (:generator 5
 217            ,@(if (eq size :float)
 218                  `((inst fsts value offset object)
 219                    (unless (location= value result)
 220                      (inst funop :copy value result)))
 221                  `((inst ,(ecase size (:byte 'stb) (:short 'sth) (:long 'stw))
 222                          value offset object)
 223                    (move value result)))))))))
 224   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 225     unsigned-reg positive-fixnum :byte nil)
 226   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 227     signed-reg tagged-num :byte t)
 228   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 229     unsigned-reg positive-fixnum :short nil)
 230   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 231     signed-reg tagged-num :short t)
 232   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 233     unsigned-reg unsigned-num :long nil)
 234   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 235     signed-reg signed-num :long t)
 236   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 237     sap-reg system-area-pointer :long)
 238   (def-system-ref-and-set sap-ref-lispobj %set-sap-ref-lispobj
 239     descriptor-reg * :long)
 240   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 241     single-reg single-float :float)
 242   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 243     double-reg double-float :float))
 244 \f
 245 ;;; Noise to convert normal lisp data objects into SAPs.
 246 (define-vop (vector-sap)
 247   (:translate vector-sap)
 248   (:policy :fast-safe)
 249   (:args (vector :scs (descriptor-reg)))
 250   (:results (sap :scs (sap-reg)))
 251   (:result-types system-area-pointer)
 252   (:generator 2
 253     (inst addi (- (* vector-data-offset n-word-bytes) other-pointer-lowtag)
 254                vector sap)))