src/compiler/mips/c-call.lisp

   1 ;;;; VOPs and other machine-specific support routines for call-out to C
   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 (defun my-make-wired-tn (prim-type-name sc-name offset)
  15   (make-wired-tn (primitive-type-or-lose prim-type-name)
  16                  (sc-number-or-lose sc-name)
  17                  offset))
  18
  19 (defstruct arg-state
  20   (stack-frame-size 0)
  21   (did-int-arg nil)
  22   (float-args 0))
  23
  24 (define-alien-type-method (integer :arg-tn) (type state)
  25   (let ((stack-frame-size (arg-state-stack-frame-size state)))
  26     (setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
  27     (setf (arg-state-did-int-arg state) t)
  28     (multiple-value-bind
  29         (ptype reg-sc stack-sc)
  30         (if (alien-integer-type-signed type)
  31             (values 'signed-byte-32 'signed-reg 'signed-stack)
  32             (values 'unsigned-byte-32 'unsigned-reg 'unsigned-stack))
  33       (if (< stack-frame-size 4)
  34           (my-make-wired-tn ptype reg-sc (+ stack-frame-size 4))
  35           (my-make-wired-tn ptype stack-sc stack-frame-size)))))
  36
  37 (define-alien-type-method (system-area-pointer :arg-tn) (type state)
  38   (declare (ignore type))
  39   (let ((stack-frame-size (arg-state-stack-frame-size state)))
  40     (setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
  41     (setf (arg-state-did-int-arg state) t)
  42     (if (< stack-frame-size 4)
  43         (my-make-wired-tn 'system-area-pointer
  44                           'sap-reg
  45                           (+ stack-frame-size 4))
  46         (my-make-wired-tn 'system-area-pointer
  47                           'sap-stack
  48                           stack-frame-size))))
  49
  50 (define-alien-type-method (double-float :arg-tn) (type state)
  51   (declare (ignore type))
  52   (let ((stack-frame-size (logandc2 (1+ (arg-state-stack-frame-size state)) 1))
  53         (float-args (arg-state-float-args state)))
  54     (setf (arg-state-stack-frame-size state) (+ stack-frame-size 2))
  55     (setf (arg-state-float-args state) (1+ float-args))
  56     (cond ((>= stack-frame-size 4)
  57            (my-make-wired-tn 'double-float
  58                              'double-stack
  59                              stack-frame-size))
  60           ((and (not (arg-state-did-int-arg state))
  61                 (< float-args 2))
  62            (my-make-wired-tn 'double-float
  63                              'double-reg
  64                              (+ (* float-args 2) 12)))
  65           (t
  66            (my-make-wired-tn 'double-float
  67                              'double-int-carg-reg
  68                              (+ stack-frame-size 4))))))
  69
  70 (define-alien-type-method (single-float :arg-tn) (type state)
  71   (declare (ignore type))
  72   (let ((stack-frame-size (arg-state-stack-frame-size state))
  73         (float-args (arg-state-float-args state)))
  74     (setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
  75     (setf (arg-state-float-args state) (1+ float-args))
  76     (cond ((>= stack-frame-size 4)
  77            (my-make-wired-tn 'single-float
  78                              'single-stack
  79                              stack-frame-size))
  80           ((and (not (arg-state-did-int-arg state))
  81                 (< float-args 2))
  82            (my-make-wired-tn 'single-float
  83                              'single-reg
  84                              (+ (* float-args 2) 12)))
  85           (t
  86            (my-make-wired-tn 'single-float
  87                              'single-int-carg-reg
  88                              (+ stack-frame-size 4))))))
  89
  90 (defstruct result-state
  91   (num-results 0))
  92
  93 (defun result-reg-offset (slot)
  94   (ecase slot
  95     (0 nl0-offset)
  96     (1 nl1-offset)))
  97
  98 (define-alien-type-method (integer :result-tn) (type state)
  99   (let ((num-results (result-state-num-results state)))
 100     (setf (result-state-num-results state) (1+ num-results))
 101     (multiple-value-bind (ptype reg-sc)
 102         (if (alien-integer-type-signed type)
 103             (values 'signed-byte-32 'signed-reg)
 104             (values 'unsigned-byte-32 'unsigned-reg))
 105       (my-make-wired-tn ptype reg-sc (result-reg-offset num-results)))))
 106
 107 (define-alien-type-method (system-area-pointer :result-tn) (type state)
 108   (declare (ignore type))
 109   (let ((num-results (result-state-num-results state)))
 110     (setf (result-state-num-results state) (1+ num-results))
 111     (my-make-wired-tn 'system-area-pointer 'sap-reg (result-reg-offset num-results))))
 112
 113 ;;; FIXME: do these still work? -- CSR, 2002-08-28
 114 (define-alien-type-method (double-float :result-tn) (type state)
 115   (declare (ignore type))
 116   (let ((num-results (result-state-num-results state)))
 117     (setf (result-state-num-results state) (1+ num-results))
 118     (my-make-wired-tn 'double-float 'double-reg (* num-results 2))))
 119
 120 (define-alien-type-method (single-float :result-tn) (type state)
 121   (declare (ignore type))
 122   (let ((num-results (result-state-num-results state)))
 123     (setf (result-state-num-results state) (1+ num-results))
 124     (my-make-wired-tn 'single-float 'single-reg (* num-results 2))))
 125
 126 (define-alien-type-method (values :result-tn) (type state)
 127   (let ((values (alien-values-type-values type)))
 128     (when (> (length values) 2)
 129       (error "Too many result values from c-call."))
 130     (mapcar #'(lambda (type)
 131                 (invoke-alien-type-method :result-tn type state))
 132             values)))
 133
 134 (!def-vm-support-routine make-call-out-tns (type)
 135   (let ((arg-state (make-arg-state)))
 136     (collect ((arg-tns))
 137       (dolist (arg-type (alien-fun-type-arg-types type))
 138         (arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
 139       (values (my-make-wired-tn 'positive-fixnum 'any-reg nsp-offset)
 140               (* (max (arg-state-stack-frame-size arg-state) 4) n-word-bytes)
 141               (arg-tns)
 142               (invoke-alien-type-method :result-tn
 143                                         (alien-fun-type-result-type type)
 144                                         (make-result-state))))))
 145
 146 (deftransform %alien-funcall ((function type &rest args))
 147   (aver (sb!c::constant-lvar-p type))
 148   (let* ((type (sb!c::lvar-value type))
 149          (env (sb!kernel:make-null-lexenv))
 150          (arg-types (alien-fun-type-arg-types type))
 151          (result-type (alien-fun-type-result-type type)))
 152     (aver (= (length arg-types) (length args)))
 153     ;; We need to do something special for 64-bit integer arguments
 154     ;; and results.
 155     (if (or (some #'(lambda (type)
 156                       (and (alien-integer-type-p type)
 157                            (> (sb!alien::alien-integer-type-bits type) 32)))
 158                   arg-types)
 159             (and (alien-integer-type-p result-type)
 160                  (> (sb!alien::alien-integer-type-bits result-type) 32)))
 161         (collect ((new-args) (lambda-vars) (new-arg-types))
 162                  (dolist (type arg-types)
 163                    (let ((arg (gensym)))
 164                      (lambda-vars arg)
 165                      (cond ((and (alien-integer-type-p type)
 166                                  (> (sb!alien::alien-integer-type-bits type) 32))
 167                             ;; 64-bit long long types are stored in
 168                             ;; consecutive locations, endian word order,
 169                             ;; aligned to 8 bytes.
 170                             (when (oddp (length (new-args)))
 171                               (new-args nil))
 172                             #!-little-endian
 173                             (progn (new-args `(ash ,arg -32))
 174                                    (new-args `(logand ,arg #xffffffff))
 175                                    (if (oddp (length (new-arg-types)))
 176                                        (new-arg-types (parse-alien-type '(unsigned 32) env)))
 177                                    (if (alien-integer-type-signed type)
 178                                        (new-arg-types (parse-alien-type '(signed 32) env))
 179                                        (new-arg-types (parse-alien-type '(unsigned 32) env)))
 180                                    (new-arg-types (parse-alien-type '(unsigned 32) env)))
 181                             #!+little-endian
 182                             (progn (new-args `(logand ,arg #xffffffff))
 183                                    (new-args `(ash ,arg -32))
 184                                    (if (oddp (length (new-arg-types)))
 185                                        (new-arg-types (parse-alien-type '(unsigned 32) env)))
 186                                    (new-arg-types (parse-alien-type '(unsigned 32) env))
 187                                    (if (alien-integer-type-signed type)
 188                                        (new-arg-types (parse-alien-type '(signed 32) env))
 189                                        (new-arg-types (parse-alien-type '(unsigned 32) env)))))
 190                            (t
 191                             (new-args arg)
 192                             (new-arg-types type)))))
 193                  (cond ((and (alien-integer-type-p result-type)
 194                              (> (sb!alien::alien-integer-type-bits result-type) 32))
 195                         (let ((new-result-type
 196                                (let ((sb!alien::*values-type-okay* t))
 197                                  (parse-alien-type
 198                                   (if (alien-integer-type-signed result-type)
 199                                       #!-little-endian
 200                                       '(values (signed 32) (unsigned 32))
 201                                       #!+little-endian
 202                                       '(values (unsigned 32) (signed 32))
 203                                       '(values (unsigned 32) (unsigned 32)))
 204                                   env))))
 205                           `(lambda (function type ,@(lambda-vars))
 206                             (declare (ignore type))
 207                              (multiple-value-bind
 208                                #!-little-endian
 209                                (high low)
 210                                #!+little-endian
 211                                (low high)
 212                                (%alien-funcall function
 213                                   ',(make-alien-fun-type
 214                                        :arg-types (new-arg-types)
 215                                        :result-type new-result-type)
 216                                   ,@(new-args))
 217                                (logior low (ash high 32))))))
 218                        (t
 219                         `(lambda (function type ,@(lambda-vars))
 220                           (declare (ignore type))
 221                           (%alien-funcall function
 222                            ',(make-alien-fun-type
 223                               :arg-types (new-arg-types)
 224                               :result-type result-type)
 225                            ,@(new-args))))))
 226         (sb!c::give-up-ir1-transform))))
 227
 228 (define-vop (foreign-symbol-sap)
 229   (:translate foreign-symbol-sap)
 230   (:policy :fast-safe)
 231   (:args)
 232   (:arg-types (:constant simple-string))
 233   (:info foreign-symbol)
 234   (:results (res :scs (sap-reg)))
 235   (:result-types system-area-pointer)
 236   (:generator 2
 237     (inst li res (make-fixup foreign-symbol :foreign))))
 238
 239 #!+linkage-table
 240 (define-vop (foreign-symbol-dataref-sap)
 241   (:translate foreign-symbol-dataref-sap)
 242   (:policy :fast-safe)
 243   (:args)
 244   (:arg-types (:constant simple-string))
 245   (:info foreign-symbol)
 246   (:results (res :scs (sap-reg)))
 247   (:result-types system-area-pointer)
 248   (:temporary (:scs (non-descriptor-reg)) addr)
 249   (:generator 2
 250     (inst li addr (make-fixup foreign-symbol :foreign-dataref))
 251     (loadw res addr)))
 252
 253 (define-vop (call-out)
 254   (:args (function :scs (sap-reg) :target cfunc)
 255          (args :more t))
 256   (:results (results :more t))
 257   (:ignore args results)
 258   (:save-p t)
 259   (:temporary (:sc any-reg :offset cfunc-offset
 260                    :from (:argument 0) :to (:result 0)) cfunc)
 261   (:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
 262   (:vop-var vop)
 263   (:generator 0
 264     (let ((cur-nfp (current-nfp-tn vop)))
 265       (when cur-nfp
 266         (store-stack-tn nfp-save cur-nfp))
 267       (inst jal (make-fixup "call_into_c" :foreign))
 268       (move cfunc function t)
 269       (when cur-nfp
 270         (load-stack-tn cur-nfp nfp-save)))))
 271
 272 (define-vop (alloc-number-stack-space)
 273   (:info amount)
 274   (:result-types system-area-pointer)
 275   (:results (result :scs (sap-reg any-reg)))
 276   (:temporary (:scs (unsigned-reg) :to (:result 0)) temp)
 277   (:generator 0
 278     (unless (zerop amount)
 279       (let ((delta (logandc2 (+ amount 7) 7)))
 280         (cond ((< delta (ash 1 15))
 281                (inst subu nsp-tn delta))
 282               (t
 283                (inst li temp delta)
 284                (inst subu nsp-tn temp)))))
 285     (move result nsp-tn)))
 286
 287 (define-vop (dealloc-number-stack-space)
 288   (:info amount)
 289   (:policy :fast-safe)
 290   (:temporary (:scs (unsigned-reg) :to (:result 0)) temp)
 291   (:generator 0
 292     (unless (zerop amount)
 293       (let ((delta (logandc2 (+ amount 7) 7)))
 294         (cond ((< delta (ash 1 15))
 295                (inst addu nsp-tn delta))
 296               (t
 297                (inst li temp delta)
 298                (inst addu nsp-tn temp)))))))
 299
 300 #-sb-xc-host
 301 (defun alien-callback-accessor-form (type sap offset)
 302   (let ((parsed-type type))
 303     (if (alien-integer-type-p parsed-type)
 304         (let ((bits (sb!alien::alien-integer-type-bits parsed-type)))
 305                (let ((byte-offset
 306                       (cond ((< bits n-word-bits)
 307                              (- n-word-bytes
 308                                 (ceiling bits n-byte-bits)))
 309                             (t 0))))
 310                  `(deref (sap-alien (sap+ ,sap
 311                                           ,(+ byte-offset offset))
 312                                     (* ,type)))))
 313         `(deref (sap-alien (sap+ ,sap ,offset) (* ,type))))))
 314
 315 ;;; Returns a vector in static space containing machine code for the
 316 ;;; callback wrapper
 317 #-sb-xc-host
 318 (defun alien-callback-assembler-wrapper (index result-type argument-types)
 319   #!+sb-doc
 320   "Cons up a piece of code which calls enter-alien-callback with INDEX
 321 and a pointer to the arguments."
 322   (flet ((make-gpr (n)
 323            (make-random-tn :kind :normal :sc (sc-or-lose 'any-reg) :offset n))
 324          (make-fpr (n)
 325            (make-random-tn :kind :normal :sc (sc-or-lose 'double-reg) :offset n)))
 326     (let* ((segment (make-segment))
 327            (n-argument-words
 328              (mapcar (lambda (arg) (ceiling (alien-type-bits arg) n-word-bits))
 329                      argument-types))
 330            (n-linkage-area-bytes 8)
 331            (n-return-area-words
 332              (ceiling (or (alien-type-bits result-type) 0) n-word-bits))
 333            (n-return-area-bytes (* n-return-area-words n-word-bytes))
 334            (n-callee-register-args-bytes 16)
 335            (n-frame-bytes (logandc2 (+ n-linkage-area-bytes
 336                                        n-return-area-bytes
 337                                        n-callee-register-args-bytes
 338                                        7)
 339                                     7))
 340            (words-processed 0)
 341            (int-seen)
 342            (gprs (mapcar #'make-gpr '(4 5 6 7)))
 343            (fprs (mapcar #'make-fpr '(12 14))))
 344       (flet ((save-arg (type words)
 345              (let ((offset (* words-processed n-word-bytes)))
 346                (cond ((not (alien-float-type-p type))
 347                       (when (and (alien-integer-type-p type)
 348                                  (> (sb!alien::alien-integer-type-bits type)
 349                                     n-word-bits)
 350                                  (oddp words-processed))
 351                         (pop gprs)
 352                         (incf words-processed)
 353                         (incf offset n-word-bytes))
 354                       (when gprs
 355                         (loop repeat words
 356                           for gpr = (pop gprs)
 357                           when gpr do
 358                             (inst sw gpr nsp-tn offset)
 359                           do
 360                             (setf int-seen t)
 361                             (incf words-processed)
 362                             (incf offset n-word-bytes))))
 363                      ((alien-single-float-type-p type)
 364                       (when gprs
 365                         (let ((gpr (pop gprs))
 366                               (fpr (pop fprs)))
 367                           (if int-seen
 368                               (when gpr (inst sw gpr nsp-tn offset))
 369                               (when fpr (inst swc1 fpr nsp-tn offset))))
 370                         (incf words-processed)))
 371                      ((alien-double-float-type-p type)
 372                       (when (oddp words-processed)
 373                         (pop gprs)
 374                         (incf words-processed)
 375                         (incf offset n-word-bytes))
 376                       (when gprs
 377                         (let* ((gpr1 (pop gprs))
 378                                (gpr2 (pop gprs))
 379                                (fpr (pop fprs)))
 380                           (if int-seen
 381                             (when gpr1
 382                               (ecase *backend-byte-order*
 383                                 (:big-endian
 384                                  (inst sw gpr1 nsp-tn offset)
 385                                  (inst sw gpr2 nsp-tn (+ offset n-word-bytes)))
 386                                 (:little-endian
 387                                  (inst sw gpr2 nsp-tn offset)
 388                                  (inst sw gpr1 nsp-tn (+ offset n-word-bytes)))))
 389                             (when fpr
 390                               (ecase *backend-byte-order*
 391                                 (:big-endian
 392                                  (inst swc1 fpr nsp-tn offset)
 393                                  (inst swc1-odd fpr nsp-tn (+ offset n-word-bytes)))
 394                                 (:little-endian
 395                                  (inst swc1-odd fpr nsp-tn offset)
 396                                  (inst swc1 fpr nsp-tn (+ offset n-word-bytes)))))))
 397                         (incf words-processed 2)))
 398                      (t
 399                       (bug "Unknown alien floating point type: ~S" type))))))
 400         (assemble (segment)
 401           (mapc #'save-arg argument-types n-argument-words)
 402           ;; funcall3 (enter-alien-callback, index, args, return-area)
 403           ;;
 404           ;; INDEX is fixnumized, ARGS and RETURN-AREA don't need to be
 405           ;; because they're word-aligned. Kinda gross, but hey ...
 406           (destructuring-bind (v0 v1 a0 a1 a2 a3 t9 gp sp ra)
 407               (mapcar #'make-gpr '(2 3 4 5 6 7 25 28 29 31))
 408             ;; Allocate stack frame.
 409             (inst subu sp n-frame-bytes)
 410
 411             ;; Save GP and RA.
 412             (inst sw gp sp (- n-frame-bytes (* 2 n-word-bytes)))
 413             (inst sw ra sp (- n-frame-bytes n-word-bytes))
 414
 415             ;; Setup the args and make the call.
 416             (inst li a0 (get-lisp-obj-address #'enter-alien-callback))
 417             (inst li t9 (foreign-symbol-address "funcall3"))
 418             (inst li a1 (fixnumize index))
 419             (inst addu a2 sp n-frame-bytes)
 420             (inst jal t9)
 421             (inst addu a3 sp n-callee-register-args-bytes)
 422
 423             ;; We're back! Restore GP.
 424             (inst lw gp sp (- n-frame-bytes (* 2 n-word-bytes)))
 425
 426             ;; Load the return value.
 427             (cond
 428               ((alien-single-float-type-p result-type)
 429                (inst lwc1 (make-fpr 0) sp n-callee-register-args-bytes))
 430               ((alien-double-float-type-p result-type)
 431                (inst lwc1 (make-fpr 0) sp n-callee-register-args-bytes)
 432                (inst lwc1 (make-fpr 1) sp (+ n-callee-register-args-bytes
 433                                              n-word-bytes)))
 434               ((and (alien-integer-type-p result-type)
 435                     (> (sb!alien::alien-integer-type-bits result-type)
 436                        n-word-bits))
 437                (inst lw v0 sp n-callee-register-args-bytes)
 438                (inst lw v1 sp (+ n-callee-register-args-bytes n-word-bytes)))
 439               ((or (alien-integer-type-p result-type)
 440                    (alien-pointer-type-p result-type)
 441                    (alien-type-= #.(parse-alien-type 'system-area-pointer nil)
 442                                    result-type))
 443                (inst lw v0 sp n-callee-register-args-bytes))
 444               ((alien-void-type-p result-type))
 445               (t
 446                (error "unrecognized alien type: ~A" result-type)))
 447
 448             ;; Restore RA, free stack frame, and return.
 449             (inst lw ra sp (- n-frame-bytes n-word-bytes))
 450             (inst j ra)
 451             (inst addu sp n-frame-bytes))))
 452       (finalize-segment segment)
 453       ;; Now that the segment is done, convert it to a static
 454       ;; vector we can point foreign code to.
 455       (let ((buffer (sb!assem::segment-buffer segment)))
 456         (make-static-vector (length buffer)
 457                             :element-type '(unsigned-byte 8)
 458                             :initial-contents buffer)))))