src/compiler/x86-64/sap.lisp

   1 ;;;; SAP operations for the x86 VM
   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 (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 (define-move-vop move-to-sap :move
  24   (descriptor-reg) (sap-reg))
  25
  26 ;;; Move an untagged SAP to a tagged representation.
  27 (define-vop (move-from-sap)
  28   (:args (sap :scs (sap-reg) :to :result))
  29   (:results (res :scs (descriptor-reg) :from :argument))
  30   (:note "SAP to pointer coercion")
  31   (:node-var node)
  32   (:generator 20
  33     (with-fixed-allocation (res sap-widetag sap-size node)
  34       (storew sap res sap-pointer-slot other-pointer-lowtag))))
  35 (define-move-vop move-from-sap :move
  36   (sap-reg) (descriptor-reg))
  37
  38 ;;; Move untagged sap values.
  39 (define-vop (sap-move)
  40   (:args (x :target y
  41             :scs (sap-reg)
  42             :load-if (not (location= x y))))
  43   (:results (y :scs (sap-reg)
  44                :load-if (not (location= x y))))
  45   (:note "SAP move")
  46   (:effects)
  47   (:affected)
  48   (:generator 0
  49     (move y x)))
  50 (define-move-vop sap-move :move
  51   (sap-reg) (sap-reg))
  52
  53 ;;; Move untagged sap arguments/return-values.
  54 (define-vop (move-sap-arg)
  55   (:args (x :target y
  56             :scs (sap-reg))
  57          (fp :scs (any-reg)
  58              :load-if (not (sc-is y sap-reg))))
  59   (:results (y))
  60   (:note "SAP argument move")
  61   (:generator 0
  62     (sc-case y
  63       (sap-reg
  64        (move y x))
  65       (sap-stack
  66        (if (= (tn-offset fp) esp-offset)
  67            (storew x fp (tn-offset y))  ; c-call
  68            (storew x fp (- (1+ (tn-offset y)))))))))
  69 (define-move-vop move-sap-arg :move-arg
  70   (descriptor-reg sap-reg) (sap-reg))
  71
  72 ;;; Use standard MOVE-ARG + coercion to move an untagged sap to a
  73 ;;; descriptor passing location.
  74 (define-move-vop move-arg :move-arg
  75   (sap-reg) (descriptor-reg))
  76 \f
  77 ;;;; SAP-INT and INT-SAP
  78
  79 ;;; The function SAP-INT is used to generate an integer corresponding
  80 ;;; to the system area pointer, suitable for passing to the kernel
  81 ;;; interfaces (which want all addresses specified as integers). The
  82 ;;; function INT-SAP is used to do the opposite conversion. The
  83 ;;; integer representation of a SAP is the byte offset of the SAP from
  84 ;;; the start of the address space.
  85 (define-vop (sap-int)
  86   (:args (sap :scs (sap-reg) :target int))
  87   (:arg-types system-area-pointer)
  88   (:results (int :scs (unsigned-reg)))
  89   (:result-types unsigned-num)
  90   (:translate sap-int)
  91   (:policy :fast-safe)
  92   (:generator 1
  93     (move int sap)))
  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
 106 (define-vop (pointer+)
 107   (:translate sap+)
 108   (:args (ptr :scs (sap-reg) :target res
 109               :load-if (not (location= ptr res)))
 110          (offset :scs (signed-reg immediate)))
 111   (:arg-types system-area-pointer signed-num)
 112   (:results (res :scs (sap-reg) :from (:argument 0)
 113                  :load-if (not (location= ptr res))))
 114   (:result-types system-area-pointer)
 115   (:temporary (:sc signed-reg) temp)
 116   (:policy :fast-safe)
 117   (:generator 1
 118     (cond ((and (sc-is ptr sap-reg) (sc-is res sap-reg)
 119                 (not (location= ptr res)))
 120            (sc-case offset
 121              (signed-reg
 122               (inst lea res (make-ea :qword :base ptr :index offset :scale 1)))
 123              (immediate
 124               (let ((value (tn-value offset)))
 125                 (cond ((typep value '(or (signed-byte 32) (unsigned-byte 31)))
 126                        (inst lea res (make-ea :qword :base ptr :disp value)))
 127                       (t
 128                        (inst mov temp value)
 129                        (inst lea res (make-ea :qword :base ptr
 130                                               :index temp
 131                                               :scale 1))))))))
 132           (t
 133            (move res ptr)
 134            (sc-case offset
 135              (signed-reg
 136               (inst add res offset))
 137              (immediate
 138               (let ((value (tn-value offset)))
 139                 (cond ((typep value '(or (signed-byte 32) (unsigned-byte 31)))
 140                        (inst add res (tn-value offset)))
 141                       (t
 142                        (inst mov temp value)
 143                        (inst add res temp))))))))))
 144
 145 (define-vop (pointer-)
 146   (:translate sap-)
 147   (:args (ptr1 :scs (sap-reg) :target res)
 148          (ptr2 :scs (sap-reg)))
 149   (:arg-types system-area-pointer system-area-pointer)
 150   (:policy :fast-safe)
 151   (:results (res :scs (signed-reg) :from (:argument 0)))
 152   (:result-types signed-num)
 153   (:generator 1
 154     (move res ptr1)
 155     (inst sub res ptr2)))
 156 \f
 157 ;;;; mumble-SYSTEM-REF and mumble-SYSTEM-SET
 158
 159 (macrolet ((def-system-ref-and-set (ref-name
 160                                     set-name
 161                                     sc
 162                                     type
 163                                     size
 164                                     &optional signed)
 165              (let ((ref-name-c (symbolicate ref-name "-C"))
 166                    (set-name-c (symbolicate set-name "-C"))
 167                    (temp-sc (symbolicate size "-REG")))
 168                `(progn
 169                   (define-vop (,ref-name)
 170                     (:translate ,ref-name)
 171                     (:policy :fast-safe)
 172                     (:args (sap :scs (sap-reg))
 173                            (offset :scs (signed-reg)))
 174                     (:arg-types system-area-pointer signed-num)
 175                     ,@(unless (eq size :qword)
 176                         `((:temporary (:sc ,temp-sc
 177                                        :from (:eval 0)
 178                                        :to (:eval 1))
 179                                       temp)))
 180                     (:results (result :scs (,sc)))
 181                     (:result-types ,type)
 182                     (:generator 5
 183                                 (inst mov ,(if (eq size :qword) 'result 'temp)
 184                                       (make-ea ,size :base sap :index offset))
 185                                 ,@(unless (eq size :qword)
 186                                     `((inst ,(if signed 'movsx 'movzx)
 187                                             result temp)))))
 188                   (define-vop (,ref-name-c)
 189                     (:translate ,ref-name)
 190                     (:policy :fast-safe)
 191                     (:args (sap :scs (sap-reg)))
 192                     (:arg-types system-area-pointer
 193                                 (:constant (signed-byte 32)))
 194                     (:info offset)
 195                     ,@(unless (eq size :qword)
 196                         `((:temporary (:sc ,temp-sc
 197                                        :from (:eval 0)
 198                                        :to (:eval 1))
 199                                       temp)))
 200                     (:results (result :scs (,sc)))
 201                     (:result-types ,type)
 202                     (:generator 4
 203                                 (inst mov ,(if (eq size :qword) 'result 'temp)
 204                                       (make-ea ,size :base sap :disp offset))
 205                                 ,@(unless (eq size :qword)
 206                                     `((inst ,(if signed 'movsx 'movzx)
 207                                             result temp)))))
 208                   (define-vop (,set-name)
 209                     (:translate ,set-name)
 210                     (:policy :fast-safe)
 211                     (:args (sap :scs (sap-reg) :to (:eval 0))
 212                            (offset :scs (signed-reg) :to (:eval 0))
 213                            (value :scs (,sc)
 214                                   :target ,(if (eq size :qword)
 215                                                'result
 216                                                'temp)))
 217                     (:arg-types system-area-pointer signed-num ,type)
 218                     ,@(unless (eq size :qword)
 219                         `((:temporary (:sc ,temp-sc :offset rax-offset
 220                                            :from (:argument 2) :to (:result 0)
 221                                            :target result)
 222                                       temp)))
 223                     (:results (result :scs (,sc)))
 224                     (:result-types ,type)
 225                     (:generator 5
 226                                 ,@(unless (eq size :qword)
 227                                     `((move rax-tn value)))
 228                                 (inst mov (make-ea ,size
 229                                                    :base sap
 230                                                    :index offset)
 231                                       ,(if (eq size :qword) 'value 'temp))
 232                                 (move result
 233                                       ,(if (eq size :qword) 'value 'rax-tn))))
 234                   (define-vop (,set-name-c)
 235                     (:translate ,set-name)
 236                     (:policy :fast-safe)
 237                     (:args (sap :scs (sap-reg) :to (:eval 0))
 238                            (value :scs (,sc)
 239                                   :target ,(if (eq size :qword)
 240                                                'result
 241                                                'temp)))
 242                     (:arg-types system-area-pointer
 243                                 (:constant (signed-byte 32)) ,type)
 244                     (:info offset)
 245                     ,@(unless (eq size :qword)
 246                         `((:temporary (:sc ,temp-sc :offset rax-offset
 247                                            :from (:argument 2) :to (:result 0)
 248                                            :target result)
 249                                       temp)))
 250                     (:results (result :scs (,sc)))
 251                     (:result-types ,type)
 252                     (:generator 4
 253                                 ,@(unless (eq size :qword)
 254                                     `((move rax-tn value)))
 255                                 (inst mov
 256                                       (make-ea ,size :base sap :disp offset)
 257                                       ,(if (eq size :qword) 'value 'temp))
 258                                 (move result ,(if (eq size :qword)
 259                                                   'value
 260                                                   'rax-tn))))))))
 261
 262   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8
 263     unsigned-reg positive-fixnum :byte nil)
 264   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8
 265     signed-reg tagged-num :byte t)
 266   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16
 267     unsigned-reg positive-fixnum :word nil)
 268   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16
 269     signed-reg tagged-num :word t)
 270   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32
 271     unsigned-reg unsigned-num :dword nil)
 272   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32
 273     signed-reg signed-num :dword t)
 274   (def-system-ref-and-set sap-ref-64 %set-sap-ref-64
 275     unsigned-reg unsigned-num :qword nil)
 276   (def-system-ref-and-set signed-sap-ref-64 %set-signed-sap-ref-64
 277     signed-reg signed-num :qword t)
 278   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap
 279     sap-reg system-area-pointer :qword))
 280 \f
 281 ;;;; SAP-REF-DOUBLE
 282
 283 (define-vop (sap-ref-double)
 284   (:translate sap-ref-double)
 285   (:policy :fast-safe)
 286   (:args (sap :scs (sap-reg))
 287          (offset :scs (signed-reg)))
 288   (:arg-types system-area-pointer signed-num)
 289   (:results (result :scs (double-reg)))
 290   (:result-types double-float)
 291   (:generator 5
 292      (inst movsd result (make-ea :qword :base sap :index offset))))
 293
 294 (define-vop (sap-ref-double-c)
 295   (:translate sap-ref-double)
 296   (:policy :fast-safe)
 297   (:args (sap :scs (sap-reg)))
 298   (:arg-types system-area-pointer (:constant (signed-byte 32)))
 299   (:info offset)
 300   (:results (result :scs (double-reg)))
 301   (:result-types double-float)
 302   (:generator 4
 303      (inst movsd result (make-ea :qword :base sap :disp offset))))
 304
 305 (define-vop (%set-sap-ref-double)
 306   (:translate %set-sap-ref-double)
 307   (:policy :fast-safe)
 308   (:args (sap :scs (sap-reg) :to (:eval 0))
 309          (offset :scs (signed-reg) :to (:eval 0))
 310          (value :scs (double-reg)))
 311   (:arg-types system-area-pointer signed-num double-float)
 312   (:results (result :scs (double-reg)))
 313   (:result-types double-float)
 314   (:generator 5
 315     (inst movsd (make-ea :qword :base sap :index offset) value)
 316     (move result value)))
 317
 318 (define-vop (%set-sap-ref-double-c)
 319   (:translate %set-sap-ref-double)
 320   (:policy :fast-safe)
 321   (:args (sap :scs (sap-reg) :to (:eval 0))
 322          (value :scs (double-reg)))
 323   (:arg-types system-area-pointer (:constant (signed-byte 32)) double-float)
 324   (:info offset)
 325   (:results (result :scs (double-reg)))
 326   (:result-types double-float)
 327   (:generator 4
 328     (inst movsd (make-ea :qword :base sap :disp offset) value)
 329     (move result value)))
 330 \f
 331 ;;;; SAP-REF-SINGLE
 332
 333 (define-vop (sap-ref-single)
 334   (:translate sap-ref-single)
 335   (:policy :fast-safe)
 336   (:args (sap :scs (sap-reg))
 337          (offset :scs (signed-reg)))
 338   (:arg-types system-area-pointer signed-num)
 339   (:results (result :scs (single-reg)))
 340   (:result-types single-float)
 341   (:generator 5
 342      (inst movss result (make-ea :dword :base sap :index offset))))
 343
 344 (define-vop (sap-ref-single-c)
 345   (:translate sap-ref-single)
 346   (:policy :fast-safe)
 347   (:args (sap :scs (sap-reg)))
 348   (:arg-types system-area-pointer (:constant (signed-byte 32)))
 349   (:info offset)
 350   (:results (result :scs (single-reg)))
 351   (:result-types single-float)
 352   (:generator 4
 353      (inst movss result (make-ea :dword :base sap :disp offset))))
 354
 355 (define-vop (%set-sap-ref-single)
 356   (:translate %set-sap-ref-single)
 357   (:policy :fast-safe)
 358   (:args (sap :scs (sap-reg) :to (:eval 0))
 359          (offset :scs (signed-reg) :to (:eval 0))
 360          (value :scs (single-reg)))
 361   (:arg-types system-area-pointer signed-num single-float)
 362   (:results (result :scs (single-reg)))
 363   (:result-types single-float)
 364   (:generator 5
 365     (inst movss (make-ea :dword :base sap :index offset) value)
 366     (move result value)))
 367
 368 (define-vop (%set-sap-ref-single-c)
 369   (:translate %set-sap-ref-single)
 370   (:policy :fast-safe)
 371   (:args (sap :scs (sap-reg) :to (:eval 0))
 372          (value :scs (single-reg)))
 373   (:arg-types system-area-pointer (:constant (signed-byte 32)) single-float)
 374   (:info offset)
 375   (:results (result :scs (single-reg)))
 376   (:result-types single-float)
 377   (:generator 4
 378     (inst movss (make-ea :dword :base sap :disp offset) value)
 379     (move result value)))
 380
 381 \f
 382 ;;; noise to convert normal lisp data objects into SAPs
 383
 384 (define-vop (vector-sap)
 385   (:translate vector-sap)
 386   (:policy :fast-safe)
 387   (:args (vector :scs (descriptor-reg) :target sap))
 388   (:results (sap :scs (sap-reg)))
 389   (:result-types system-area-pointer)
 390   (:generator 2
 391     (move sap vector)
 392     (inst add
 393           sap
 394           (- (* vector-data-offset n-word-bytes) other-pointer-lowtag))))
 395
 396