src/compiler/mips/system.lisp

   1 ;;;; MIPS 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
  14 \f
  15 ;;;; Type frobbing VOPs
  16
  17 (define-vop (widetag-of)
  18   (:translate widetag-of)
  19   (:policy :fast-safe)
  20   (:args (object :scs (descriptor-reg)))
  21   (:temporary (:scs (non-descriptor-reg)) ndescr)
  22   (:results (result :scs (unsigned-reg)))
  23   (:result-types positive-fixnum)
  24   (:generator 6
  25     ;; Pick off objects with headers.
  26     (inst and ndescr object lowtag-mask)
  27     (inst xor ndescr other-pointer-lowtag)
  28     (inst beq ndescr other-ptr)
  29     (inst xor ndescr (logxor other-pointer-lowtag fun-pointer-lowtag))
  30     (inst beq ndescr function-ptr)
  31
  32     ;; Pick off fixnums.
  33     (inst and result object fixnum-tag-mask)
  34     (inst beq result done)
  35
  36     ;; Pick off structure and list pointers.
  37     (inst and result object 1)
  38     (inst bne result lowtag-only)
  39     (inst nop)
  40
  41       ;; Must be an other immediate.
  42     (inst b done)
  43     (inst and result object widetag-mask)
  44
  45     FUNCTION-PTR
  46     (load-type result object (- fun-pointer-lowtag))
  47     (inst b done)
  48     (inst nop)
  49
  50     LOWTAG-ONLY
  51     (inst b done)
  52     (inst and result object lowtag-mask)
  53
  54     OTHER-PTR
  55     (load-type result object (- other-pointer-lowtag))
  56     (inst nop)
  57
  58     DONE))
  59
  60 (define-vop (%other-pointer-widetag)
  61   (:translate %other-pointer-widetag)
  62   (:policy :fast-safe)
  63   (:args (object :scs (descriptor-reg)))
  64   (:results (result :scs (unsigned-reg)))
  65   (:result-types positive-fixnum)
  66   (:generator 6
  67     (load-type result object (- other-pointer-lowtag))))
  68
  69 (define-vop (fun-subtype)
  70   (:translate fun-subtype)
  71   (:policy :fast-safe)
  72   (:args (function :scs (descriptor-reg)))
  73   (:results (result :scs (unsigned-reg)))
  74   (:result-types positive-fixnum)
  75   (:generator 6
  76     (load-type result function (- fun-pointer-lowtag))
  77     (inst nop)))
  78
  79 (define-vop (get-header-data)
  80   (:translate get-header-data)
  81   (:policy :fast-safe)
  82   (:args (x :scs (descriptor-reg)))
  83   (:results (res :scs (unsigned-reg)))
  84   (:result-types positive-fixnum)
  85   (:generator 6
  86     (loadw res x 0 other-pointer-lowtag)
  87     (inst srl res res n-widetag-bits)))
  88
  89 (define-vop (get-closure-length)
  90   (:translate get-closure-length)
  91   (:policy :fast-safe)
  92   (:args (x :scs (descriptor-reg)))
  93   (:results (res :scs (unsigned-reg)))
  94   (:result-types positive-fixnum)
  95   (:generator 6
  96     (loadw res x 0 fun-pointer-lowtag)
  97     (inst srl res res n-widetag-bits)
  98     (inst and res res short-header-max-words)))
  99
 100 (define-vop (set-header-data)
 101   (:translate set-header-data)
 102   (:policy :fast-safe)
 103   (:args (x :scs (descriptor-reg) :target res)
 104          (data :scs (any-reg immediate zero)))
 105   (:arg-types * positive-fixnum)
 106   (:results (res :scs (descriptor-reg)))
 107   (:temporary (:scs (non-descriptor-reg)) t1 t2)
 108   (:generator 6
 109     (loadw t1 x 0 other-pointer-lowtag)
 110     (inst and t1 widetag-mask)
 111     (sc-case data
 112       (any-reg
 113        (inst sll t2 data (- n-widetag-bits n-fixnum-tag-bits))
 114        (inst or t1 t2))
 115       (immediate
 116        (let ((val (ash (tn-value data) n-widetag-bits)))
 117          (cond ((typep val '(unsigned-byte 16))
 118                 (inst or t1 val))
 119                (t
 120                 (inst li t2 val)
 121                 (inst or t1 t2)))))
 122       (zero))
 123     (storew t1 x 0 other-pointer-lowtag)
 124     (move res x)))
 125
 126 (define-vop (pointer-hash)
 127   (:translate pointer-hash)
 128   (:args (ptr :scs (any-reg descriptor-reg)))
 129   (:results (res :scs (any-reg descriptor-reg)))
 130   (:policy :fast-safe)
 131   (:generator 1
 132     ;; FIXME: It would be better if this would mask the lowtag,
 133     ;; and shift the result into a positive fixnum like on x86.
 134     (inst sll res ptr 3)
 135     (inst srl res res 1)))
 136
 137 \f
 138 ;;;; Allocation
 139
 140 (define-vop (dynamic-space-free-pointer)
 141   (:results (int :scs (sap-reg)))
 142   (:result-types system-area-pointer)
 143   (:translate dynamic-space-free-pointer)
 144   (:policy :fast-safe)
 145   (:generator 1
 146     (move int alloc-tn)))
 147
 148 (define-vop (binding-stack-pointer-sap)
 149   (:results (int :scs (sap-reg)))
 150   (:result-types system-area-pointer)
 151   (:translate binding-stack-pointer-sap)
 152   (:policy :fast-safe)
 153   (:generator 1
 154     (move int bsp-tn)))
 155
 156 (define-vop (control-stack-pointer-sap)
 157   (:results (int :scs (sap-reg)))
 158   (:result-types system-area-pointer)
 159   (:translate control-stack-pointer-sap)
 160   (:policy :fast-safe)
 161   (:generator 1
 162     (move int csp-tn)))
 163
 164 \f
 165 ;;;; Code object frobbing.
 166
 167 (define-vop (code-instructions)
 168   (:translate code-instructions)
 169   (:policy :fast-safe)
 170   (:args (code :scs (descriptor-reg)))
 171   (:temporary (:scs (non-descriptor-reg)) ndescr)
 172   (:results (sap :scs (sap-reg)))
 173   (:result-types system-area-pointer)
 174   (:generator 10
 175     (loadw ndescr code 0 other-pointer-lowtag)
 176     (inst srl ndescr n-widetag-bits)
 177     (inst sll ndescr word-shift)
 178     (inst subu ndescr other-pointer-lowtag)
 179     (inst addu sap code ndescr)))
 180
 181 (define-vop (compute-fun)
 182   (:args (code :scs (descriptor-reg))
 183          (offset :scs (signed-reg unsigned-reg)))
 184   (:arg-types * positive-fixnum)
 185   (:results (func :scs (descriptor-reg)))
 186   (:temporary (:scs (non-descriptor-reg)) ndescr)
 187   (:generator 10
 188     (loadw ndescr code 0 other-pointer-lowtag)
 189     (inst srl ndescr n-widetag-bits)
 190     (inst sll ndescr word-shift)
 191     (inst addu ndescr offset)
 192     (inst addu ndescr (- fun-pointer-lowtag other-pointer-lowtag))
 193     (inst addu func code ndescr)))
 194
 195 \f
 196 ;;;; Other random VOPs.
 197
 198
 199 (defknown sb!unix::receive-pending-interrupt () (values))
 200 (define-vop (sb!unix::receive-pending-interrupt)
 201   (:policy :fast-safe)
 202   (:translate sb!unix::receive-pending-interrupt)
 203   (:generator 1
 204     (inst break 0 pending-interrupt-trap)))
 205
 206
 207 (define-vop (halt)
 208   (:generator 1
 209     (inst break 0 halt-trap)))
 210
 211 \f
 212 ;;;; Dynamic vop count collection support
 213
 214 (define-vop (count-me)
 215   (:args (count-vector :scs (descriptor-reg)))
 216   (:info index)
 217   (:temporary (:scs (non-descriptor-reg)) count)
 218   (:generator 1
 219     (let ((offset
 220            (- (* (+ index vector-data-offset) n-word-bytes) other-pointer-lowtag)))
 221       (inst lw count count-vector offset)
 222       (inst nop)
 223       (inst addu count 1)
 224       (inst sw count count-vector offset))))
 225
 226 ;;;; Dummy definition for a spin-loop hint VOP
 227 (define-vop (spin-loop-hint)
 228   (:translate spin-loop-hint)
 229   (:policy :fast-safe)
 230   (:generator 0))