src/compiler/x86/system.lisp

   1 ;;;; x86 VM definitions of various system hacking 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 ;;;; type frobbing VOPs
  15
  16 (define-vop (lowtag-of)
  17   (:translate lowtag-of)
  18   (:policy :fast-safe)
  19   (:args (object :scs (any-reg descriptor-reg control-stack)
  20                  :target result))
  21   (:results (result :scs (unsigned-reg)))
  22   (:result-types positive-fixnum)
  23   (:generator 1
  24     (move result object)
  25     (inst and result lowtag-mask)))
  26
  27 (define-vop (widetag-of)
  28   (:translate widetag-of)
  29   (:policy :fast-safe)
  30   (:args (object :scs (descriptor-reg)))
  31   (:temporary (:sc unsigned-reg :offset eax-offset :to (:result 0)) eax)
  32   (:results (result :scs (unsigned-reg)))
  33   (:result-types positive-fixnum)
  34   (:generator 6
  35     (inst mov eax object)
  36     (inst and al-tn lowtag-mask)
  37     (inst cmp al-tn other-pointer-lowtag)
  38     (inst jmp :e other-ptr)
  39     (inst cmp al-tn fun-pointer-lowtag)
  40     (inst jmp :e function-ptr)
  41
  42     ;; Pick off structures and list pointers.
  43     (inst test al-tn 1)
  44     (inst jmp :ne done)
  45
  46     ;; Pick off fixnums.
  47     (inst and al-tn 3)
  48     (inst jmp :e done)
  49
  50     ;; must be an other immediate
  51     (inst mov eax object)
  52     (inst jmp done)
  53
  54     FUNCTION-PTR
  55     (load-type al-tn object (- fun-pointer-lowtag))
  56     (inst jmp done)
  57
  58     OTHER-PTR
  59     (load-type al-tn object (- other-pointer-lowtag))
  60
  61     DONE
  62     (inst movzx result al-tn)))
  63 \f
  64 (define-vop (fun-subtype)
  65   (:translate fun-subtype)
  66   (:policy :fast-safe)
  67   (:args (function :scs (descriptor-reg)))
  68   (:temporary (:sc byte-reg :from (:eval 0) :to (:eval 1)) temp)
  69   (:results (result :scs (unsigned-reg)))
  70   (:result-types positive-fixnum)
  71   (:generator 6
  72     (load-type temp function (- fun-pointer-lowtag))
  73     (inst movzx result temp)))
  74
  75 (define-vop (set-fun-subtype)
  76   (:translate (setf fun-subtype))
  77   (:policy :fast-safe)
  78   (:args (type :scs (unsigned-reg) :target eax)
  79          (function :scs (descriptor-reg)))
  80   (:arg-types positive-fixnum *)
  81   (:temporary (:sc unsigned-reg :offset eax-offset :from (:argument 0)
  82                    :to (:result 0) :target result)
  83               eax)
  84   (:results (result :scs (unsigned-reg)))
  85   (:result-types positive-fixnum)
  86   (:generator 6
  87     (move eax type)
  88     (storeb al-tn function 0 fun-pointer-lowtag)
  89     (move result eax)))
  90
  91 (define-vop (get-header-data)
  92   (:translate get-header-data)
  93   (:policy :fast-safe)
  94   (:args (x :scs (descriptor-reg)))
  95   (:results (res :scs (unsigned-reg)))
  96   (:result-types positive-fixnum)
  97   (:generator 6
  98     (loadw res x 0 other-pointer-lowtag)
  99     (inst shr res n-widetag-bits)))
 100
 101 (define-vop (get-closure-length)
 102   (:translate get-closure-length)
 103   (:policy :fast-safe)
 104   (:args (x :scs (descriptor-reg)))
 105   (:results (res :scs (unsigned-reg)))
 106   (:result-types positive-fixnum)
 107   (:generator 6
 108     (loadw res x 0 fun-pointer-lowtag)
 109     (inst shr res n-widetag-bits)))
 110
 111 (define-vop (set-header-data)
 112   (:translate set-header-data)
 113   (:policy :fast-safe)
 114   (:args (x :scs (descriptor-reg) :target res :to (:result 0))
 115          (data :scs (any-reg) :target eax))
 116   (:arg-types * positive-fixnum)
 117   (:results (res :scs (descriptor-reg)))
 118   (:temporary (:sc unsigned-reg :offset eax-offset
 119                    :from (:argument 1) :to (:result 0)) eax)
 120   (:generator 6
 121     (move eax data)
 122     (inst shl eax (- n-widetag-bits 2))
 123     (inst mov al-tn (make-ea :byte :base x :disp (- other-pointer-lowtag)))
 124     (storew eax x 0 other-pointer-lowtag)
 125     (move res x)))
 126 \f
 127 (define-vop (make-fixnum)
 128   (:args (ptr :scs (any-reg descriptor-reg) :target res))
 129   (:results (res :scs (any-reg descriptor-reg)))
 130   (:generator 1
 131     ;; Some code (the hash table code) depends on this returning a
 132     ;; positive number so make sure it does.
 133     (move res ptr)
 134     (inst shl res 3)
 135     (inst shr res 1)))
 136
 137 (define-vop (make-other-immediate-type)
 138   (:args (val :scs (any-reg descriptor-reg) :target res)
 139          (type :scs (unsigned-reg immediate)))
 140   (:results (res :scs (any-reg descriptor-reg) :from (:argument 0)))
 141   (:generator 2
 142     (move res val)
 143     (inst shl res (- n-widetag-bits 2))
 144     (inst or res (sc-case type
 145                    (unsigned-reg type)
 146                    (immediate (tn-value type))))))
 147 \f
 148 ;;;; allocation
 149
 150 (define-vop (dynamic-space-free-pointer)
 151   (:results (int :scs (sap-reg)))
 152   (:result-types system-area-pointer)
 153   (:translate dynamic-space-free-pointer)
 154   (:policy :fast-safe)
 155   (:generator 1
 156     (load-symbol-value int *allocation-pointer*)))
 157
 158 (define-vop (binding-stack-pointer-sap)
 159   (:results (int :scs (sap-reg)))
 160   (:result-types system-area-pointer)
 161   (:translate binding-stack-pointer-sap)
 162   (:policy :fast-safe)
 163   (:generator 1
 164     (load-binding-stack-pointer int)))
 165
 166 (defknown (setf binding-stack-pointer-sap)
 167     (system-area-pointer) system-area-pointer ())
 168
 169 (define-vop (set-binding-stack-pointer-sap)
 170   (:args (new-value :scs (sap-reg) :target int))
 171   (:arg-types system-area-pointer)
 172   (:results (int :scs (sap-reg)))
 173   (:result-types system-area-pointer)
 174   (:translate (setf binding-stack-pointer-sap))
 175   (:policy :fast-safe)
 176   (:generator 1
 177     (store-binding-stack-pointer new-value)
 178     (move int new-value)))
 179
 180 (define-vop (control-stack-pointer-sap)
 181   (:results (int :scs (sap-reg)))
 182   (:result-types system-area-pointer)
 183   (:translate control-stack-pointer-sap)
 184   (:policy :fast-safe)
 185   (:generator 1
 186     (move int esp-tn)))
 187 \f
 188 ;;;; code object frobbing
 189
 190 (define-vop (code-instructions)
 191   (:translate code-instructions)
 192   (:policy :fast-safe)
 193   (:args (code :scs (descriptor-reg) :to (:result 0)))
 194   (:results (sap :scs (sap-reg) :from (:argument 0)))
 195   (:result-types system-area-pointer)
 196   (:generator 10
 197     (loadw sap code 0 other-pointer-lowtag)
 198     (inst shr sap n-widetag-bits)
 199     (inst lea sap (make-ea :byte :base code :index sap :scale 4
 200                            :disp (- other-pointer-lowtag)))))
 201
 202 (define-vop (compute-fun)
 203   (:args (code :scs (descriptor-reg) :to (:result 0))
 204          (offset :scs (signed-reg unsigned-reg) :to (:result 0)))
 205   (:arg-types * positive-fixnum)
 206   (:results (func :scs (descriptor-reg) :from (:argument 0)))
 207   (:generator 10
 208     (loadw func code 0 other-pointer-lowtag)
 209     (inst shr func n-widetag-bits)
 210     (inst lea func
 211           (make-ea :byte :base offset :index func :scale 4
 212                    :disp (- fun-pointer-lowtag other-pointer-lowtag)))
 213     (inst add func code)))
 214
 215 (define-vop (%simple-fun-self)
 216   (:policy :fast-safe)
 217   (:translate %simple-fun-self)
 218   (:args (function :scs (descriptor-reg)))
 219   (:results (result :scs (descriptor-reg)))
 220   (:generator 3
 221     (loadw result function simple-fun-self-slot fun-pointer-lowtag)
 222     (inst lea result
 223           (make-ea :byte :base result
 224                    :disp (- fun-pointer-lowtag
 225                             (* simple-fun-code-offset n-word-bytes))))))
 226
 227 ;;; The closure function slot is a pointer to raw code on X86 instead
 228 ;;; of a pointer to the code function object itself. This VOP is used
 229 ;;; to reference the function object given the closure object.
 230 (define-source-transform %closure-fun (closure)
 231   `(%simple-fun-self ,closure))
 232
 233 (define-vop (%set-fun-self)
 234   (:policy :fast-safe)
 235   (:translate (setf %simple-fun-self))
 236   (:args (new-self :scs (descriptor-reg) :target result :to :result)
 237          (function :scs (descriptor-reg) :to :result))
 238   (:temporary (:sc any-reg :from (:argument 0) :to :result) temp)
 239   (:results (result :scs (descriptor-reg)))
 240   (:generator 3
 241     (inst lea temp (make-ea-for-object-slot new-self simple-fun-code-offset
 242                                             fun-pointer-lowtag))
 243     (storew temp function simple-fun-self-slot fun-pointer-lowtag)
 244     (move result new-self)))
 245 \f
 246 ;;;; other miscellaneous VOPs
 247
 248 (defknown sb!unix::receive-pending-interrupt () (values))
 249 (define-vop (sb!unix::receive-pending-interrupt)
 250   (:policy :fast-safe)
 251   (:translate sb!unix::receive-pending-interrupt)
 252   (:generator 1
 253     (inst break pending-interrupt-trap)))
 254
 255 #!+sb-thread
 256 (defknown current-thread-offset-sap ((unsigned-byte 32))
 257   system-area-pointer (flushable))
 258
 259 #!+sb-thread
 260 (define-vop (current-thread-offset-sap)
 261   (:results (sap :scs (sap-reg)))
 262   (:result-types system-area-pointer)
 263   (:translate current-thread-offset-sap)
 264   (:args (n :scs (unsigned-reg) :target sap))
 265   (:arg-types unsigned-num)
 266   (:policy :fast-safe)
 267   (:generator 2
 268     (inst fs-segment-prefix)
 269     (inst mov sap (make-ea :dword :disp 0 :index n :scale 4))))
 270
 271 (define-vop (halt)
 272   (:generator 1
 273     (inst break halt-trap)))
 274
 275 (defknown float-wait () (values))
 276 (define-vop (float-wait)
 277   (:policy :fast-safe)
 278   (:translate float-wait)
 279   (:vop-var vop)
 280   (:save-p :compute-only)
 281   (:generator 1
 282     (note-next-instruction vop :internal-error)
 283     (inst wait)))
 284 \f
 285 ;;;; dynamic vop count collection support
 286
 287 #!+sb-dyncount
 288 (define-vop (count-me)
 289   (:args (count-vector :scs (descriptor-reg)))
 290   (:info index)
 291   (:generator 0
 292     (inst inc (make-ea-for-vector-data count-vector :offset index))))