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 (frame-word-offset (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                                     ref-insn
 162                                     sc
 163                                     type
 164                                     size)
 165              (let ((ref-name-c (symbolicate ref-name "-C"))
 166                    (set-name-c (symbolicate set-name "-C")))
 167                `(progn
 168                   (define-vop (,ref-name)
 169                     (:translate ,ref-name)
 170                     (:policy :fast-safe)
 171                     (:args (sap :scs (sap-reg))
 172                            (offset :scs (signed-reg)))
 173                     (:arg-types system-area-pointer signed-num)
 174                     (:results (result :scs (,sc)))
 175                     (:result-types ,type)
 176                     (:generator 5
 177                       (inst ,ref-insn result
 178                             (make-ea ,size :base sap :index offset))))
 179                   (define-vop (,ref-name-c)
 180                     (:translate ,ref-name)
 181                     (:policy :fast-safe)
 182                     (:args (sap :scs (sap-reg)))
 183                     (:arg-types system-area-pointer
 184                                 (:constant (signed-byte 32)))
 185                     (:info offset)
 186                     (:results (result :scs (,sc)))
 187                     (:result-types ,type)
 188                     (:generator 4
 189                       (inst ,ref-insn result
 190                             (make-ea ,size :base sap :disp offset))))
 191                   (define-vop (,set-name)
 192                     (:translate ,set-name)
 193                     (:policy :fast-safe)
 194                     (:args (sap :scs (sap-reg) :to (:eval 0))
 195                            (offset :scs (signed-reg) :to (:eval 0))
 196                            (value :scs (,sc) :target result))
 197                     (:arg-types system-area-pointer signed-num ,type)
 198                     (:results (result :scs (,sc)))
 199                     (:result-types ,type)
 200                     (:generator 5
 201                       (inst mov (make-ea ,size :base sap :index offset)
 202                             (reg-in-size value ,size))
 203                       (move result value)))
 204                   (define-vop (,set-name-c)
 205                     (:translate ,set-name)
 206                     (:policy :fast-safe)
 207                     (:args (sap :scs (sap-reg) :to (:eval 0))
 208                            (value :scs (,sc) :target result))
 209                     (:arg-types system-area-pointer
 210                                 (:constant (signed-byte 32)) ,type)
 211                     (:info offset)
 212                     (:results (result :scs (,sc)))
 213                     (:result-types ,type)
 214                     (:generator 4
 215                       (inst mov (make-ea ,size :base sap :disp offset)
 216                             (reg-in-size value ,size))
 217                       (move result value)))))))
 218
 219   (def-system-ref-and-set sap-ref-8 %set-sap-ref-8 movzx
 220     unsigned-reg positive-fixnum :byte)
 221   (def-system-ref-and-set signed-sap-ref-8 %set-signed-sap-ref-8 movsx
 222     signed-reg tagged-num :byte)
 223   (def-system-ref-and-set sap-ref-16 %set-sap-ref-16 movzx
 224     unsigned-reg positive-fixnum :word)
 225   (def-system-ref-and-set signed-sap-ref-16 %set-signed-sap-ref-16 movsx
 226     signed-reg tagged-num :word)
 227   (def-system-ref-and-set sap-ref-32 %set-sap-ref-32 movzxd
 228     unsigned-reg unsigned-num :dword)
 229   (def-system-ref-and-set signed-sap-ref-32 %set-signed-sap-ref-32 movsxd
 230     signed-reg signed-num :dword)
 231   (def-system-ref-and-set sap-ref-64 %set-sap-ref-64 mov
 232     unsigned-reg unsigned-num :qword)
 233   (def-system-ref-and-set signed-sap-ref-64 %set-signed-sap-ref-64 mov
 234     signed-reg signed-num :qword)
 235   (def-system-ref-and-set sap-ref-sap %set-sap-ref-sap mov
 236     sap-reg system-area-pointer :qword)
 237   (def-system-ref-and-set sap-ref-lispobj %set-sap-ref-lispobj mov
 238     descriptor-reg * :qword))
 239 \f
 240 ;;;; SAP-REF-DOUBLE
 241
 242 (define-vop (sap-ref-double)
 243   (:translate sap-ref-double)
 244   (:policy :fast-safe)
 245   (:args (sap :scs (sap-reg))
 246          (offset :scs (signed-reg)))
 247   (:arg-types system-area-pointer signed-num)
 248   (:results (result :scs (double-reg)))
 249   (:result-types double-float)
 250   (:generator 5
 251      (inst movsd result (make-ea :qword :base sap :index offset))))
 252
 253 (define-vop (sap-ref-double-c)
 254   (:translate sap-ref-double)
 255   (:policy :fast-safe)
 256   (:args (sap :scs (sap-reg)))
 257   (:arg-types system-area-pointer (:constant (signed-byte 32)))
 258   (:info offset)
 259   (:results (result :scs (double-reg)))
 260   (:result-types double-float)
 261   (:generator 4
 262      (inst movsd result (make-ea :qword :base sap :disp offset))))
 263
 264 (define-vop (%set-sap-ref-double)
 265   (:translate %set-sap-ref-double)
 266   (:policy :fast-safe)
 267   (:args (sap :scs (sap-reg) :to (:eval 0))
 268          (offset :scs (signed-reg) :to (:eval 0))
 269          (value :scs (double-reg)))
 270   (:arg-types system-area-pointer signed-num double-float)
 271   (:results (result :scs (double-reg)))
 272   (:result-types double-float)
 273   (:generator 5
 274     (inst movsd (make-ea :qword :base sap :index offset) value)
 275     (move result value)))
 276
 277 (define-vop (%set-sap-ref-double-c)
 278   (:translate %set-sap-ref-double)
 279   (:policy :fast-safe)
 280   (:args (sap :scs (sap-reg) :to (:eval 0))
 281          (value :scs (double-reg)))
 282   (:arg-types system-area-pointer (:constant (signed-byte 32)) double-float)
 283   (:info offset)
 284   (:results (result :scs (double-reg)))
 285   (:result-types double-float)
 286   (:generator 4
 287     (inst movsd (make-ea :qword :base sap :disp offset) value)
 288     (move result value)))
 289 \f
 290 ;;;; SAP-REF-SINGLE
 291
 292 (define-vop (sap-ref-single)
 293   (:translate sap-ref-single)
 294   (:policy :fast-safe)
 295   (:args (sap :scs (sap-reg))
 296          (offset :scs (signed-reg)))
 297   (:arg-types system-area-pointer signed-num)
 298   (:results (result :scs (single-reg)))
 299   (:result-types single-float)
 300   (:generator 5
 301      (inst movss result (make-ea :dword :base sap :index offset))))
 302
 303 (define-vop (sap-ref-single-c)
 304   (:translate sap-ref-single)
 305   (:policy :fast-safe)
 306   (:args (sap :scs (sap-reg)))
 307   (:arg-types system-area-pointer (:constant (signed-byte 32)))
 308   (:info offset)
 309   (:results (result :scs (single-reg)))
 310   (:result-types single-float)
 311   (:generator 4
 312      (inst movss result (make-ea :dword :base sap :disp offset))))
 313
 314 (define-vop (%set-sap-ref-single)
 315   (:translate %set-sap-ref-single)
 316   (:policy :fast-safe)
 317   (:args (sap :scs (sap-reg) :to (:eval 0))
 318          (offset :scs (signed-reg) :to (:eval 0))
 319          (value :scs (single-reg)))
 320   (:arg-types system-area-pointer signed-num single-float)
 321   (:results (result :scs (single-reg)))
 322   (:result-types single-float)
 323   (:generator 5
 324     (inst movss (make-ea :dword :base sap :index offset) value)
 325     (move result value)))
 326
 327 (define-vop (%set-sap-ref-single-c)
 328   (:translate %set-sap-ref-single)
 329   (:policy :fast-safe)
 330   (:args (sap :scs (sap-reg) :to (:eval 0))
 331          (value :scs (single-reg)))
 332   (:arg-types system-area-pointer (:constant (signed-byte 32)) single-float)
 333   (:info offset)
 334   (:results (result :scs (single-reg)))
 335   (:result-types single-float)
 336   (:generator 4
 337     (inst movss (make-ea :dword :base sap :disp offset) value)
 338     (move result value)))
 339
 340 \f
 341 ;;; noise to convert normal lisp data objects into SAPs
 342
 343 (define-vop (vector-sap)
 344   (:translate vector-sap)
 345   (:policy :fast-safe)
 346   (:args (vector :scs (descriptor-reg) :target sap))
 347   (:results (sap :scs (sap-reg)))
 348   (:result-types system-area-pointer)
 349   (:generator 2
 350     (let ((disp (- (* vector-data-offset n-word-bytes) other-pointer-lowtag)))
 351       (if (location= sap vector)
 352           (inst add sap disp)
 353           (inst lea sap (make-ea :qword :base vector :disp disp))))))
 354