src/compiler/mips/vm.lisp

   1 ;;;; miscellaneous VM definition noise for MIPS
   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 ;;;; Registers
  16
  17 (eval-when (:compile-toplevel :load-toplevel :execute)
  18   (defvar *register-names* (make-array 32 :initial-element nil)))
  19
  20 (macrolet ((defreg (name offset)
  21                (let ((offset-sym (symbolicate name "-OFFSET")))
  22                  `(eval-when (:compile-toplevel :load-toplevel :execute)
  23                    (def!constant ,offset-sym ,offset)
  24                    (setf (svref *register-names* ,offset-sym) ,(symbol-name name)))))
  25
  26            (defregset (name &rest regs)
  27                `(eval-when (:compile-toplevel :load-toplevel :execute)
  28                  (defparameter ,name
  29                    (list ,@(mapcar #'(lambda (name) (symbolicate name "-OFFSET")) regs))))))
  30   ;; Wired zero register.
  31   (defreg zero 0) ; NULL
  32   ;; Reserved for assembler use.
  33   (defreg nl3 1) ; untagged temporary 3
  34   ;; C return registers.
  35   (defreg cfunc 2) ; FF function address, wastes a register
  36   (defreg nl4 3) ; PA flag
  37   ;; C argument registers.
  38   (defreg nl0 4) ; untagged temporary 0
  39   (defreg nl1 5) ; untagged temporary 1
  40   (defreg nl2 6) ; untagged temporary 2
  41   (defreg nargs 7) ; number of function arguments
  42   ;; C unsaved temporaries.
  43   (defreg a0 8) ; function arg 0
  44   (defreg a1 9) ; function arg 1
  45   (defreg a2 10) ; function arg 2
  46   (defreg a3 11) ; function arg 3
  47   (defreg a4 12) ; function arg 4
  48   (defreg a5 13) ; function arg 5
  49   (defreg fdefn 14) ; ?
  50   (defreg lexenv 15) ; wastes a register
  51   ;; C saved registers.
  52   (defreg nfp 16) ; non-lisp frame pointer
  53   (defreg ocfp 17) ; caller's control frame pointer
  54   (defreg lra 18) ; tagged Lisp return address
  55   (defreg l0 19) ; tagged temporary 0
  56   (defreg null 20) ; NIL
  57   (defreg bsp 21) ; binding stack pointer
  58   (defreg cfp 22) ; control frame pointer
  59   (defreg csp 23) ; control stack pointer
  60   ;; More C unsaved temporaries.
  61   (defreg l1 24) ; tagged temporary 1
  62   (defreg alloc 25) ; ALLOC pointer
  63   ;; 26 and 27 are used by the system kernel.
  64   ;; 28 is the global pointer of our C runtime, and used for
  65   ;; jump/branch relaxation in Lisp.
  66   (defreg nsp 29) ; number (native) stack pointer
  67   ;; C frame pointer, or additional saved register.
  68   (defreg code 30) ; current function object
  69   ;; Return link register.
  70   (defreg lip 31) ; Lisp interior pointer
  71
  72   (defregset non-descriptor-regs
  73       nl0 nl1 nl2 nl3 nl4 cfunc nargs nfp)
  74
  75   (defregset descriptor-regs
  76       a0 a1 a2 a3 a4 a5 fdefn lexenv ocfp lra l0 l1)
  77
  78   (defregset *register-arg-offsets*
  79       a0 a1 a2 a3 a4 a5)
  80
  81   (defregset reserve-descriptor-regs
  82       fdefn lexenv)
  83
  84   (defregset reserve-non-descriptor-regs
  85       nl4 cfunc))
  86
  87 \f
  88 ;;;; SB and SC definition:
  89
  90 (define-storage-base registers :finite :size 32)
  91 (define-storage-base float-registers :finite :size 32)
  92 (define-storage-base control-stack :unbounded :size 8)
  93 (define-storage-base non-descriptor-stack :unbounded :size 0)
  94 (define-storage-base constant :non-packed)
  95 (define-storage-base immediate-constant :non-packed)
  96
  97 ;;;
  98 ;;; Handy macro so we don't have to keep changing all the numbers whenever
  99 ;;; we insert a new storage class.
 100 ;;;
 101 (defmacro !define-storage-classes (&rest classes)
 102   (do ((forms (list 'progn)
 103               (let* ((class (car classes))
 104                      (sc-name (car class))
 105                      (constant-name (intern (concatenate 'simple-string
 106                                                          (string sc-name)
 107                                                          "-SC-NUMBER"))))
 108                 (list* `(define-storage-class ,sc-name ,index
 109                           ,@(cdr class))
 110                        `(def!constant ,constant-name ,index)
 111                        forms)))
 112        (index 0 (1+ index))
 113        (classes classes (cdr classes)))
 114       ((null classes)
 115        (nreverse forms))))
 116
 117 (def!constant kludge-nondeterministic-catch-block-size 6)
 118
 119 (!define-storage-classes
 120
 121   ;; Non-immediate constants in the constant pool
 122   (constant constant)
 123
 124   ;; Immediate constant.
 125   (null immediate-constant)
 126   (zero immediate-constant)
 127   (immediate immediate-constant)
 128
 129   ;; **** The stacks.
 130
 131   ;; The control stack.  (Scanned by GC)
 132   (control-stack control-stack)
 133
 134   ;; We put ANY-REG and DESCRIPTOR-REG early so that their SC-NUMBER
 135   ;; is small and therefore the error trap information is smaller.
 136   ;; Moving them up here from their previous place down below saves
 137   ;; ~250K in core file size.  --njf, 2006-01-27
 138
 139   ;; Immediate descriptor objects.  Don't have to be seen by GC, but nothing
 140   ;; bad will happen if they are.  (fixnums, characters, header values, etc).
 141   (any-reg
 142    registers
 143    :locations #.(append non-descriptor-regs descriptor-regs)
 144    :reserve-locations #.(append reserve-non-descriptor-regs
 145                                 reserve-descriptor-regs)
 146    :constant-scs (constant zero immediate)
 147    :save-p t
 148    :alternate-scs (control-stack))
 149
 150   ;; Pointer descriptor objects.  Must be seen by GC.
 151   (descriptor-reg registers
 152    :locations #.descriptor-regs
 153    :reserve-locations #.reserve-descriptor-regs
 154    :constant-scs (constant null immediate)
 155    :save-p t
 156    :alternate-scs (control-stack))
 157
 158   ;; The non-descriptor stacks.
 159   (signed-stack non-descriptor-stack) ; (signed-byte 32)
 160   (unsigned-stack non-descriptor-stack) ; (unsigned-byte 32)
 161   (character-stack non-descriptor-stack) ; non-descriptor characters.
 162   (sap-stack non-descriptor-stack) ; System area pointers.
 163   (single-stack non-descriptor-stack) ; single-floats
 164   (double-stack non-descriptor-stack
 165                 :element-size 2 :alignment 2) ; double floats.
 166   ;; complex-single-floats
 167   (complex-single-stack non-descriptor-stack :element-size 2)
 168   ;; complex-double-floats.
 169   (complex-double-stack non-descriptor-stack :element-size 4 :alignment 2)
 170
 171
 172   ;; **** Things that can go in the integer registers.
 173
 174   ;; Non-Descriptor characters
 175   (character-reg registers
 176    :locations #.non-descriptor-regs
 177    :reserve-locations #.reserve-non-descriptor-regs
 178    :constant-scs (immediate)
 179    :save-p t
 180    :alternate-scs (character-stack))
 181
 182   ;; Non-Descriptor SAP's (arbitrary pointers into address space)
 183   (sap-reg registers
 184    :locations #.non-descriptor-regs
 185    :reserve-locations #.reserve-non-descriptor-regs
 186    :constant-scs (immediate)
 187    :save-p t
 188    :alternate-scs (sap-stack))
 189
 190   ;; Non-Descriptor (signed or unsigned) numbers.
 191   (signed-reg registers
 192    :locations #.non-descriptor-regs
 193    :reserve-locations #.reserve-non-descriptor-regs
 194    :constant-scs (zero immediate)
 195    :save-p t
 196    :alternate-scs (signed-stack))
 197   (unsigned-reg registers
 198    :locations #.non-descriptor-regs
 199    :reserve-locations #.reserve-non-descriptor-regs
 200    :constant-scs (zero immediate)
 201    :save-p t
 202    :alternate-scs (unsigned-stack))
 203
 204   ;; Random objects that must not be seen by GC.  Used only as temporaries.
 205   (non-descriptor-reg registers
 206    :locations #.non-descriptor-regs)
 207
 208   ;; Pointers to the interior of objects.  Used only as an temporary.
 209   (interior-reg registers
 210    :locations (#.lip-offset))
 211
 212
 213   ;; **** Things that can go in the floating point registers.
 214
 215   ;; Non-Descriptor single-floats.
 216   (single-reg float-registers
 217    :locations (0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30)
 218    :reserve-locations (26 28 30)
 219    :constant-scs ()
 220    :save-p t
 221    :alternate-scs (single-stack))
 222
 223   ;; Non-Descriptor double-floats.
 224   (double-reg float-registers
 225    :locations (0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30)
 226    :reserve-locations (26 28 30)
 227    ;; Note: we don't bother with the element size, 'cause nothing can be
 228    ;; allocated in the odd fp regs anyway.
 229    :constant-scs ()
 230    :save-p t
 231    :alternate-scs (double-stack))
 232
 233   (complex-single-reg float-registers
 234    :locations (0 4 8 12 16 20 24 28)
 235    :element-size 4
 236    :reserve-locations (24 28)
 237    :constant-scs ()
 238    :save-p t
 239    :alternate-scs (complex-single-stack))
 240
 241   (complex-double-reg float-registers
 242    :locations (0 4 8 12 16 20 24 28)
 243    :element-size 4
 244    :reserve-locations (24 28)
 245    :constant-scs ()
 246    :save-p t
 247    :alternate-scs (complex-double-stack))
 248
 249   ;; A catch or unwind block.
 250   (catch-block control-stack :element-size kludge-nondeterministic-catch-block-size)
 251
 252   ;; floating point numbers temporarily stuck in integer registers for c-call
 253   (single-int-carg-reg registers
 254                   :locations (4 5 6 7)
 255                   :alternate-scs ()
 256                   :constant-scs ())
 257   (double-int-carg-reg registers
 258                   :locations (4 6)
 259                   :constant-scs ()
 260                   :alternate-scs ()
 261                   :alignment 2          ;is this needed?
 262                   :element-size 2))
 263
 264
 265
 266 \f
 267 ;;;; Random TNs for interesting registers
 268
 269 (macrolet ((defregtn (name sc)
 270                (let ((offset-sym (symbolicate name "-OFFSET"))
 271                      (tn-sym (symbolicate name "-TN")))
 272                  `(defparameter ,tn-sym
 273                    (make-random-tn :kind :normal
 274                     :sc (sc-or-lose ',sc)
 275                     :offset ,offset-sym)))))
 276   (defregtn zero any-reg)
 277   (defregtn nargs any-reg)
 278
 279   (defregtn fdefn descriptor-reg)
 280   (defregtn lexenv descriptor-reg)
 281
 282   (defregtn nfp any-reg)
 283   (defregtn ocfp any-reg)
 284
 285   (defregtn null descriptor-reg)
 286
 287   (defregtn bsp any-reg)
 288   (defregtn cfp any-reg)
 289   (defregtn csp any-reg)
 290   (defregtn alloc any-reg)
 291   (defregtn nsp any-reg)
 292
 293   (defregtn code descriptor-reg)
 294   (defregtn lip interior-reg))
 295 \f
 296 ;;; If VALUE can be represented as an immediate constant, then return the
 297 ;;; appropriate SC number, otherwise return NIL.
 298 (!def-vm-support-routine immediate-constant-sc (value)
 299   (typecase value
 300     ((integer 0 0)
 301      (sc-number-or-lose 'zero))
 302     (null
 303      (sc-number-or-lose 'null))
 304     (symbol
 305      (if (static-symbol-p value)
 306          (sc-number-or-lose 'immediate)
 307          nil))
 308     ((or (integer #.sb!xc:most-negative-fixnum #.sb!xc:most-positive-fixnum)
 309          character)
 310      (sc-number-or-lose 'immediate))
 311     (system-area-pointer
 312      (sc-number-or-lose 'immediate))
 313     (character
 314      (sc-number-or-lose 'immediate))))
 315
 316 \f
 317 ;;;; Function Call Parameters
 318
 319 ;;; The SC numbers for register and stack arguments/return values.
 320 ;;;
 321 (def!constant register-arg-scn (meta-sc-number-or-lose 'descriptor-reg))
 322 (def!constant immediate-arg-scn (meta-sc-number-or-lose 'any-reg))
 323 (def!constant control-stack-arg-scn (meta-sc-number-or-lose 'control-stack))
 324
 325 (eval-when (:compile-toplevel :load-toplevel :execute)
 326
 327 ;;; Offsets of special stack frame locations
 328 (def!constant ocfp-save-offset 0)
 329 (def!constant lra-save-offset 1)
 330 (def!constant nfp-save-offset 2)
 331
 332 ;;; The number of arguments/return values passed in registers.
 333 ;;;
 334 (def!constant register-arg-count 6)
 335
 336 ;;; The offsets within the register-arg SC that we pass values in, first
 337 ;;; value first.
 338 ;;;
 339
 340 ;;; Names to use for the argument registers.
 341 ;;;
 342 (defconstant-eqx register-arg-names '(a0 a1 a2 a3 a4 a5) #'equal)
 343
 344 ) ; EVAL-WHEN
 345
 346
 347 ;;; A list of TN's describing the register arguments.
 348 ;;;
 349 (defparameter *register-arg-tns*
 350   (mapcar #'(lambda (n)
 351               (make-random-tn :kind :normal
 352                               :sc (sc-or-lose 'descriptor-reg)
 353                               :offset n))
 354           *register-arg-offsets*))
 355
 356 ;;; This is used by the debugger.
 357 (def!constant single-value-return-byte-offset 8)
 358 \f
 359 ;;; This function is called by debug output routines that want a pretty name
 360 ;;; for a TN's location.  It returns a thing that can be printed with PRINC.
 361 (!def-vm-support-routine location-print-name (tn)
 362   (declare (type tn tn))
 363   (let ((sb (sb-name (sc-sb (tn-sc tn))))
 364         (offset (tn-offset tn)))
 365     (ecase sb
 366       (registers (or (svref *register-names* offset)
 367                      (format nil "R~D" offset)))
 368       (float-registers (format nil "F~D" offset))
 369       (control-stack (format nil "CS~D" offset))
 370       (non-descriptor-stack (format nil "NS~D" offset))
 371       (constant (format nil "Const~D" offset))
 372       (immediate-constant "Immed"))))
 373
 374 (!def-vm-support-routine combination-implementation-style (node)
 375   (declare (type sb!c::combination node) (ignore node))
 376   (values :default nil))