src/compiler/ppc/system.lisp

   1 ;;;; PPC 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)))
  20   (:results (result :scs (unsigned-reg)))
  21   (:result-types positive-fixnum)
  22   (:generator 1
  23     (inst andi. result object lowtag-mask)))
  24
  25 (define-vop (widetag-of)
  26   (:translate widetag-of)
  27   (:policy :fast-safe)
  28   (:args (object :scs (descriptor-reg) :to (:eval 1)))
  29   (:results (result :scs (unsigned-reg) :from (:eval 0)))
  30   (:result-types positive-fixnum)
  31   (:generator 6
  32     ;; Grab the lowtag.
  33     (inst andi. result object lowtag-mask)
  34     ;; Check for various pointer types.
  35     (inst cmpwi result list-pointer-lowtag)
  36     (inst beq done)
  37     (inst cmpwi result other-pointer-lowtag)
  38     (inst beq other-pointer)
  39     (inst cmpwi result fun-pointer-lowtag)
  40     (inst beq function-pointer)
  41     (inst cmpwi result instance-pointer-lowtag)
  42     (inst beq done)
  43     ;; Okay, it is an immediate.  If fixnum, we want zero.  Otherwise,
  44     ;; we want the low 8 bits.
  45     (inst andi. result object fixnum-tag-mask)
  46     (inst beq done)
  47     ;; It wasn't a fixnum, so get the low 8 bits.
  48     (inst andi. result object widetag-mask)
  49     (inst b done)
  50
  51     FUNCTION-POINTER
  52     (load-type result object (- fun-pointer-lowtag))
  53     (inst b done)
  54
  55     OTHER-POINTER
  56     (load-type result object (- other-pointer-lowtag))
  57
  58     DONE))
  59
  60
  61 (define-vop (fun-subtype)
  62   (:translate fun-subtype)
  63   (:policy :fast-safe)
  64   (:args (function :scs (descriptor-reg)))
  65   (:results (result :scs (unsigned-reg)))
  66   (:result-types positive-fixnum)
  67   (:generator 6
  68     (load-type result function (- fun-pointer-lowtag))))
  69
  70 (define-vop (set-fun-subtype)
  71   (:translate (setf fun-subtype))
  72   (:policy :fast-safe)
  73   (:args (type :scs (unsigned-reg) :target result)
  74          (function :scs (descriptor-reg)))
  75   (:arg-types positive-fixnum *)
  76   (:results (result :scs (unsigned-reg)))
  77   (:result-types positive-fixnum)
  78   (:generator 6
  79     (inst stb type function (- 3 fun-pointer-lowtag))
  80     (move result type)))
  81
  82 (define-vop (get-header-data)
  83   (:translate get-header-data)
  84   (:policy :fast-safe)
  85   (:args (x :scs (descriptor-reg)))
  86   (:results (res :scs (unsigned-reg)))
  87   (:result-types positive-fixnum)
  88   (:generator 6
  89     (loadw res x 0 other-pointer-lowtag)
  90     (inst srwi res res n-widetag-bits)))
  91
  92 (define-vop (get-closure-length)
  93   (:translate get-closure-length)
  94   (:policy :fast-safe)
  95   (:args (x :scs (descriptor-reg)))
  96   (:results (res :scs (unsigned-reg)))
  97   (:result-types positive-fixnum)
  98   (:generator 6
  99     (loadw res x 0 fun-pointer-lowtag)
 100     (inst srwi res res n-widetag-bits)))
 101
 102 (define-vop (set-header-data)
 103   (:translate set-header-data)
 104   (:policy :fast-safe)
 105   (:args (x :scs (descriptor-reg) :target res)
 106          (data :scs (any-reg immediate zero)))
 107   (:arg-types * positive-fixnum)
 108   (:results (res :scs (descriptor-reg)))
 109   (:temporary (:scs (non-descriptor-reg)) t1 t2)
 110   (:generator 6
 111     (loadw t1 x 0 other-pointer-lowtag)
 112     (inst andi. t1 t1 widetag-mask)
 113     (sc-case data
 114       (any-reg
 115        (inst slwi t2 data (- n-widetag-bits n-fixnum-tag-bits))
 116        (inst or t1 t1 t2))
 117       (immediate
 118        (inst ori t1 t1 (ash (tn-value data) n-widetag-bits)))
 119       (zero))
 120     (storew t1 x 0 other-pointer-lowtag)
 121     (move res x)))
 122
 123
 124 (define-vop (pointer-hash)
 125   (:translate pointer-hash)
 126   (:args (ptr :scs (any-reg descriptor-reg)))
 127   (:results (res :scs (any-reg descriptor-reg)))
 128   (:policy :fast-safe)
 129   (:generator 1
 130     ;; FIXME: It would be better if this would mask the lowtag,
 131     ;; and shift the result into a positive fixnum like on x86.
 132     (inst rlwinm res ptr n-fixnum-tag-bits 1 n-positive-fixnum-bits)))
 133
 134 \f
 135 ;;;; Allocation
 136
 137 (define-vop (dynamic-space-free-pointer)
 138   (:results (int :scs (sap-reg)))
 139   (:result-types system-area-pointer)
 140   (:translate dynamic-space-free-pointer)
 141   (:policy :fast-safe)
 142   (:generator 1
 143     (move int alloc-tn)))
 144
 145 (define-vop (binding-stack-pointer-sap)
 146   (:results (int :scs (sap-reg)))
 147   (:result-types system-area-pointer)
 148   (:translate binding-stack-pointer-sap)
 149   (:policy :fast-safe)
 150   (:generator 1
 151     (move int bsp-tn)))
 152
 153 (define-vop (control-stack-pointer-sap)
 154   (:results (int :scs (sap-reg)))
 155   (:result-types system-area-pointer)
 156   (:translate control-stack-pointer-sap)
 157   (:policy :fast-safe)
 158   (:generator 1
 159     (move int csp-tn)))
 160
 161 \f
 162 ;;;; Code object frobbing.
 163
 164 (define-vop (code-instructions)
 165   (:translate code-instructions)
 166   (:policy :fast-safe)
 167   (:args (code :scs (descriptor-reg)))
 168   (:temporary (:scs (non-descriptor-reg)) ndescr)
 169   (:results (sap :scs (sap-reg)))
 170   (:result-types system-area-pointer)
 171   (:generator 10
 172     (loadw ndescr code 0 other-pointer-lowtag)
 173     (inst srwi ndescr ndescr n-widetag-bits)
 174     (inst slwi ndescr ndescr word-shift)
 175     (inst subi ndescr ndescr other-pointer-lowtag)
 176     (inst add sap code ndescr)))
 177
 178 (define-vop (compute-fun)
 179   (:args (code :scs (descriptor-reg))
 180          (offset :scs (signed-reg unsigned-reg)))
 181   (:arg-types * positive-fixnum)
 182   (:results (func :scs (descriptor-reg)))
 183   (:temporary (:scs (non-descriptor-reg)) ndescr)
 184   (:generator 10
 185     (loadw ndescr code 0 other-pointer-lowtag)
 186     (inst srwi ndescr ndescr n-widetag-bits)
 187     (inst slwi ndescr ndescr word-shift)
 188     (inst add ndescr ndescr offset)
 189     (inst addi ndescr ndescr (- fun-pointer-lowtag other-pointer-lowtag))
 190     (inst add func code ndescr)))
 191
 192
 193 \f
 194 ;;;; Other random VOPs.
 195
 196
 197 (defknown sb!unix::receive-pending-interrupt () (values))
 198 (define-vop (sb!unix::receive-pending-interrupt)
 199   (:policy :fast-safe)
 200   (:translate sb!unix::receive-pending-interrupt)
 201   (:generator 1
 202     (inst unimp pending-interrupt-trap)))
 203
 204 #!+sb-safepoint
 205 (define-vop (insert-safepoint)
 206   (:policy :fast-safe)
 207   (:translate sb!kernel::gc-safepoint)
 208   (:generator 0
 209     (emit-safepoint)))
 210
 211 #!+sb-thread
 212 (defknown current-thread-offset-sap ((unsigned-byte 64))
 213   system-area-pointer (flushable))
 214
 215 #!+sb-thread
 216 (define-vop (current-thread-offset-sap)
 217   (:results (sap :scs (sap-reg)))
 218   (:result-types system-area-pointer)
 219   (:translate current-thread-offset-sap)
 220   (:args (n :scs (unsigned-reg) :target sap))
 221   (:arg-types unsigned-num)
 222   (:policy :fast-safe)
 223   (:generator 2
 224     (inst slwi n n word-shift)
 225     (inst lwzx sap thread-base-tn n)))
 226
 227 (define-vop (halt)
 228   (:generator 1
 229     (inst unimp halt-trap)))
 230 \f
 231 ;;;; Dynamic vop count collection support
 232
 233 (define-vop (count-me)
 234   (:args (count-vector :scs (descriptor-reg)))
 235   (:info index)
 236   (:temporary (:scs (non-descriptor-reg)) count)
 237   (:generator 1
 238     (let ((offset
 239            (- (* (+ index vector-data-offset) n-word-bytes) other-pointer-lowtag)))
 240       (aver (typep offset '(signed-byte 16)))
 241       (inst lwz count count-vector offset)
 242       (inst addi count count 1)
 243       (inst stw count count-vector offset))))
 244 \f
 245 ;;;; Memory barrier support
 246
 247 #!+memory-barrier-vops
 248 (define-vop (%compiler-barrier)
 249   (:policy :fast-safe)
 250   (:translate %compiler-barrier)
 251   (:generator 3))
 252
 253 #!+memory-barrier-vops
 254 (define-vop (%memory-barrier)
 255   (:policy :fast-safe)
 256   (:translate %memory-barrier)
 257   (:generator 3
 258      (inst sync)))
 259
 260 #!+memory-barrier-vops
 261 (define-vop (%read-barrier)
 262   (:policy :fast-safe)
 263   (:translate %read-barrier)
 264   (:generator 3
 265      (inst sync)))
 266
 267 #!+memory-barrier-vops
 268 (define-vop (%write-barrier)
 269   (:policy :fast-safe)
 270   (:translate %write-barrier)
 271   (:generator 3
 272     (inst sync)))
 273
 274 #!+memory-barrier-vops
 275 (define-vop (%data-dependency-barrier)
 276   (:policy :fast-safe)
 277   (:translate %data-dependency-barrier)
 278   (:generator 3))
 279
 280 ;;;; Dummy definition for a spin-loop hint VOP
 281 (define-vop (spin-loop-hint)
 282   (:translate spin-loop-hint)
 283   (:policy :fast-safe)
 284   (:generator 0))