src/compiler/arm64/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   (:temporary (:scs (interior-reg)) lip)
  34   (:results (res :scs (descriptor-reg)))
  35   (:note "SAP to pointer coercion")
  36   (:generator 20
  37     (with-fixed-allocation (res pa-flag sap-widetag sap-size :lip lip)
  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        (store-stack-offset x fp 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+-unsigned-c)
 117   (:translate sap+)
 118   (:args (ptr :scs (sap-reg)))
 119   (:info offset)
 120   (:arg-types system-area-pointer (:constant (unsigned-byte 8)))
 121   (:results (res :scs (sap-reg)))
 122   (:result-types system-area-pointer)
 123   (:policy :fast-safe)
 124   (:generator 1
 125     (inst add res ptr offset)))
 126
 127 (define-vop (pointer+-signed-c)
 128   (:translate sap+)
 129   (:args (ptr :scs (sap-reg)))
 130   (:info offset)
 131   (:arg-types system-area-pointer (:constant (integer -255 -1)))
 132   (:results (res :scs (sap-reg)))
 133   (:result-types system-area-pointer)
 134   (:policy :fast-safe)
 135   (:generator 1
 136     (inst sub res ptr (- offset))))
 137
 138 (define-vop (pointer-)
 139   (:translate sap-)
 140   (:args (ptr1 :scs (sap-reg))
 141          (ptr2 :scs (sap-reg)))
 142   (:arg-types system-area-pointer system-area-pointer)
 143   (:policy :fast-safe)
 144   (:results (res :scs (signed-reg)))
 145   (:result-types signed-num)
 146   (:generator 1
 147     (inst sub res ptr1 ptr2)))
 148 \f
 149 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 150 (macrolet ((def-system-ref-and-set
 151                (ref-name set-name sc type size &key signed)
 152              `(progn
 153                 (define-vop (,ref-name)
 154                   (:translate ,ref-name)
 155                   (:policy :fast-safe)
 156                   (:args (sap :scs (sap-reg))
 157                          (offset :scs (signed-reg)))
 158                   (:arg-types system-area-pointer signed-num)
 159                   (:results (result :scs (,sc)))
 160                   (:result-types ,type)
 161                   (:generator 5
 162                               (inst ,(case size
 163                                        (:byte (if signed 'ldrsb 'ldrb))
 164                                        (:short (if signed 'ldrsh 'ldrh))
 165                                        (:word (if signed 'ldrsw 'ldr))
 166                                        (t 'ldr))
 167                                     ,(if (eq size :word)
 168                                          '(32-bit-reg result)
 169                                          'result)
 170                                     (@ sap offset))))
 171                 (define-vop (,set-name)
 172                   (:translate ,set-name)
 173                   (:policy :fast-safe)
 174                   (:args (sap :scs (sap-reg))
 175                          (offset :scs (signed-reg))
 176                          (value :scs (,sc) :target result))
 177                   (:arg-types system-area-pointer signed-num ,type)
 178                   (:results (result :scs (,sc)))
 179                   (:result-types ,type)
 180                   (:generator 5
 181                               (inst ,(case size
 182                                        (:byte 'strb)
 183                                        (:short 'strh)
 184                                        (t 'str))
 185                                     ,(if (eq size :word)
 186                                          '(32-bit-reg value)
 187                                          'value)
 188                                     (@ sap offset))
 189                               (unless (location= result value)
 190                                 ,@(case size
 191                                     ((:single :double)
 192                                      '((inst fmov result value)))
 193                                     (t
 194                                      '((inst mov result value))))))))))
 195   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 196     unsigned-reg positive-fixnum :byte :signed nil)
 197   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 198     signed-reg tagged-num :byte :signed t)
 199   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 200     unsigned-reg positive-fixnum :short :signed nil)
 201   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 202     signed-reg tagged-num :short :signed t)
 203   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 204     unsigned-reg unsigned-num :word :signed nil)
 205   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 206     signed-reg signed-num :word :signed t)
 207   (def-system-ref-and-set sap-ref-64 %set-sap-ref-64
 208     unsigned-reg unsigned-num :long :signed nil)
 209   (def-system-ref-and-set signed-sap-ref-64 %set-signed-sap-ref-64
 210     signed-reg signed-num :long :signed t)
 211   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 212     sap-reg system-area-pointer :long)
 213   (def-system-ref-and-set sap-ref-lispobj %set-sap-ref-lispobj
 214     descriptor-reg * :long)
 215   (def-system-ref-and-set sap-ref-single %set-sap-ref-single
 216     single-reg single-float :single)
 217   (def-system-ref-and-set sap-ref-double %set-sap-ref-double
 218     double-reg double-float :double))
 219 \f
 220 ;;; Noise to convert normal lisp data objects into SAPs.
 221 (define-vop (vector-sap)
 222   (:translate vector-sap)
 223   (:policy :fast-safe)
 224   (:args (vector :scs (descriptor-reg)))
 225   (:results (sap :scs (sap-reg)))
 226   (:result-types system-area-pointer)
 227   (:generator 2
 228     (inst add sap vector
 229           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))