src/compiler/x86-64/c-call.lisp

   1 ;;;; the VOPs and other necessary machine specific support
   2 ;;;; routines for call-out to C
   3
   4 ;;;; This software is part of the SBCL system. See the README file for
   5 ;;;; more information.
   6 ;;;;
   7 ;;;; This software is derived from the CMU CL system, which was
   8 ;;;; written at Carnegie Mellon University and released into the
   9 ;;;; public domain. The software is in the public domain and is
  10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  11 ;;;; files for more information.
  12
  13 (in-package "SB!VM")
  14
  15 ;; The MOVE-ARG vop is going to store args on the stack for
  16 ;; call-out. These tn's will be used for that. move-arg is normally
  17 ;; used for things going down the stack but C wants to have args
  18 ;; indexed in the positive direction.
  19
  20 (defun my-make-wired-tn (prim-type-name sc-name offset)
  21   (make-wired-tn (primitive-type-or-lose prim-type-name)
  22                  (sc-number-or-lose sc-name)
  23                  offset))
  24
  25 (defstruct (arg-state (:copier nil))
  26   (register-args 0)
  27   (xmm-args 0)
  28   (stack-frame-size 0))
  29
  30 (defun int-arg (state prim-type reg-sc stack-sc)
  31   (let ((reg-args (arg-state-register-args state)))
  32     (cond ((< reg-args 6)
  33            (setf (arg-state-register-args state) (1+ reg-args))
  34            (my-make-wired-tn prim-type reg-sc
  35                              (nth reg-args *c-call-register-arg-offsets*)))
  36           (t
  37            (let ((frame-size (arg-state-stack-frame-size state)))
  38              (setf (arg-state-stack-frame-size state) (1+ frame-size))
  39              (my-make-wired-tn prim-type stack-sc frame-size))))))
  40
  41 (define-alien-type-method (integer :arg-tn) (type state)
  42   (if (alien-integer-type-signed type)
  43       (int-arg state 'signed-byte-64 'signed-reg 'signed-stack)
  44       (int-arg state 'unsigned-byte-64 'unsigned-reg 'unsigned-stack)))
  45
  46 (define-alien-type-method (system-area-pointer :arg-tn) (type state)
  47   (declare (ignore type))
  48   (int-arg state 'system-area-pointer 'sap-reg 'sap-stack))
  49
  50 (defun float-arg (state prim-type reg-sc stack-sc)
  51   (let ((xmm-args (arg-state-xmm-args state)))
  52     (cond ((< xmm-args 8)
  53            (setf (arg-state-xmm-args state) (1+ xmm-args))
  54            (my-make-wired-tn prim-type reg-sc
  55                              (nth xmm-args *float-regs*)))
  56           (t
  57            (let ((frame-size (arg-state-stack-frame-size state)))
  58              (setf (arg-state-stack-frame-size state) (1+ frame-size))
  59              (my-make-wired-tn prim-type stack-sc frame-size))))))
  60
  61 (define-alien-type-method (double-float :arg-tn) (type state)
  62   (declare (ignore type))
  63   (float-arg state 'double-float 'double-reg 'double-stack))
  64
  65 (define-alien-type-method (single-float :arg-tn) (type state)
  66   (declare (ignore type))
  67   (float-arg state 'single-float 'single-reg 'single-stack))
  68
  69 (defstruct (result-state (:copier nil))
  70   (num-results 0))
  71
  72 (defun result-reg-offset (slot)
  73   (ecase slot
  74     (0 eax-offset)
  75     (1 edx-offset)))
  76
  77 ;; XXX The return handling probably doesn't conform to the ABI
  78
  79 (define-alien-type-method (integer :result-tn) (type state)
  80   (let ((num-results (result-state-num-results state)))
  81     (setf (result-state-num-results state) (1+ num-results))
  82     (multiple-value-bind (ptype reg-sc)
  83         (if (alien-integer-type-signed type)
  84             (values 'signed-byte-64 'signed-reg)
  85             (values 'unsigned-byte-64 'unsigned-reg))
  86       (my-make-wired-tn ptype reg-sc (result-reg-offset num-results)))))
  87
  88 (define-alien-type-method (integer :naturalize-gen) (type alien)
  89   (if (and (alien-integer-type-signed type)
  90            (<= (alien-type-bits type) 32))
  91       `(sign-extend ,alien)
  92       alien))
  93
  94 (define-alien-type-method (system-area-pointer :result-tn) (type state)
  95   (declare (ignore type))
  96   (let ((num-results (result-state-num-results state)))
  97     (setf (result-state-num-results state) (1+ num-results))
  98     (my-make-wired-tn 'system-area-pointer 'sap-reg
  99                       (result-reg-offset num-results))))
 100
 101 (define-alien-type-method (double-float :result-tn) (type state)
 102   (declare (ignore type))
 103   (let ((num-results (result-state-num-results state)))
 104     (setf (result-state-num-results state) (1+ num-results))
 105     (my-make-wired-tn 'double-float 'double-reg num-results)))
 106
 107 (define-alien-type-method (single-float :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 'single-float 'single-reg num-results)))
 112
 113 (define-alien-type-method (values :result-tn) (type state)
 114   (let ((values (alien-values-type-values type)))
 115     (when (> (length values) 2)
 116       (error "Too many result values from c-call."))
 117     (mapcar (lambda (type)
 118               (invoke-alien-type-method :result-tn type state))
 119             values)))
 120
 121 (!def-vm-support-routine make-call-out-tns (type)
 122   (let ((arg-state (make-arg-state)))
 123     (collect ((arg-tns))
 124       (dolist (arg-type (alien-fun-type-arg-types type))
 125         (arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
 126       (values (my-make-wired-tn 'positive-fixnum 'any-reg esp-offset)
 127               (* (arg-state-stack-frame-size arg-state) n-word-bytes)
 128               (arg-tns)
 129               (invoke-alien-type-method :result-tn
 130                                         (alien-fun-type-result-type type)
 131                                         (make-result-state))))))
 132
 133
 134 (deftransform %alien-funcall ((function type &rest args) * * :node node)
 135   (aver (sb!c::constant-lvar-p type))
 136   (let* ((type (sb!c::lvar-value type))
 137          (env (sb!c::node-lexenv node))
 138          (arg-types (alien-fun-type-arg-types type))
 139          (result-type (alien-fun-type-result-type type)))
 140     (aver (= (length arg-types) (length args)))
 141     (if (or (some #'(lambda (type)
 142                       (and (alien-integer-type-p type)
 143                            (> (sb!alien::alien-integer-type-bits type) 64)))
 144                   arg-types)
 145             (and (alien-integer-type-p result-type)
 146                  (> (sb!alien::alien-integer-type-bits result-type) 64)))
 147         (collect ((new-args) (lambda-vars) (new-arg-types))
 148           (dolist (type arg-types)
 149             (let ((arg (gensym)))
 150               (lambda-vars arg)
 151               (cond ((and (alien-integer-type-p type)
 152                           (> (sb!alien::alien-integer-type-bits type) 64))
 153                      (new-args `(logand ,arg #xffffffff))
 154                      (new-args `(ash ,arg -64))
 155                      (new-arg-types (parse-alien-type '(unsigned 64) env))
 156                      (if (alien-integer-type-signed type)
 157                          (new-arg-types (parse-alien-type '(signed 64) env))
 158                          (new-arg-types (parse-alien-type '(unsigned 64) env))))
 159                     (t
 160                      (new-args arg)
 161                      (new-arg-types type)))))
 162           (cond ((and (alien-integer-type-p result-type)
 163                       (> (sb!alien::alien-integer-type-bits result-type) 64))
 164                  (let ((new-result-type
 165                         (let ((sb!alien::*values-type-okay* t))
 166                           (parse-alien-type
 167                            (if (alien-integer-type-signed result-type)
 168                                '(values (unsigned 64) (signed 64))
 169                                '(values (unsigned 64) (unsigned 64)))
 170                            env))))
 171                    `(lambda (function type ,@(lambda-vars))
 172                       (declare (ignore type))
 173                       (multiple-value-bind (low high)
 174                           (%alien-funcall function
 175                                           ',(make-alien-fun-type
 176                                              :arg-types (new-arg-types)
 177                                              :result-type new-result-type)
 178                                           ,@(new-args))
 179                         (logior low (ash high 64))))))
 180                 (t
 181                  `(lambda (function type ,@(lambda-vars))
 182                     (declare (ignore type))
 183                     (%alien-funcall function
 184                                     ',(make-alien-fun-type
 185                                        :arg-types (new-arg-types)
 186                                        :result-type result-type)
 187                                     ,@(new-args))))))
 188         (sb!c::give-up-ir1-transform))))
 189
 190 ;;; The ABI specifies that signed short/int's are returned as 32-bit
 191 ;;; values. Negative values need to be sign-extended to 64-bits (done
 192 ;;; in a :NATURALIZE-GEN alien-type-method).
 193 (defknown sign-extend (fixnum) fixnum (foldable flushable movable))
 194
 195 (define-vop (sign-extend)
 196   (:translate sign-extend)
 197   (:policy :fast-safe)
 198   (:args (val :scs (any-reg)))
 199   (:arg-types fixnum)
 200   (:results (res :scs (any-reg)))
 201   (:result-types fixnum)
 202   (:generator 1
 203    (inst movsxd res
 204          (make-random-tn :kind :normal
 205                          :sc (sc-or-lose 'dword-reg)
 206                          :offset (tn-offset val)))))
 207
 208 (defun sign-extend (x)
 209   (if (logbitp 31 x)
 210       (dpb x (byte 32 0) -1)
 211       (ldb (byte 32 0) x)))
 212
 213 (define-vop (foreign-symbol-sap)
 214   (:translate foreign-symbol-sap)
 215   (:policy :fast-safe)
 216   (:args)
 217   (:arg-types (:constant simple-string))
 218   (:info foreign-symbol)
 219   (:results (res :scs (sap-reg)))
 220   (:result-types system-area-pointer)
 221   (:generator 2
 222    (inst lea res (make-fixup foreign-symbol :foreign))))
 223
 224 #!+linkage-table
 225 (define-vop (foreign-symbol-dataref-sap)
 226   (:translate foreign-symbol-dataref-sap)
 227   (:policy :fast-safe)
 228   (:args)
 229   (:arg-types (:constant simple-string))
 230   (:info foreign-symbol)
 231   (:results (res :scs (sap-reg)))
 232   (:result-types system-area-pointer)
 233   (:generator 2
 234    (inst mov res (make-fixup foreign-symbol :foreign-dataref))))
 235
 236 (define-vop (call-out)
 237   (:args (function :scs (sap-reg))
 238          (args :more t))
 239   (:results (results :more t))
 240   (:temporary (:sc unsigned-reg :offset rax-offset :to :result) rax)
 241   (:ignore results)
 242   (:vop-var vop)
 243   (:save-p t)
 244   (:generator 0
 245     ;; ABI: AL contains amount of arguments passed in XMM registers
 246     ;; for vararg calls.
 247     (move-immediate rax
 248                     (loop for tn-ref = args then (tn-ref-across tn-ref)
 249                        while tn-ref
 250                        count (eq (sb-name (sc-sb (tn-sc (tn-ref-tn tn-ref))))
 251                                  'float-registers)))
 252     (inst call function)
 253     ;; To give the debugger a clue. XX not really internal-error?
 254     (note-this-location vop :internal-error)
 255     ;; FLOAT15 needs to contain FP zero in Lispland
 256     (let ((float15 (make-random-tn :kind :normal
 257                                :sc (sc-or-lose 'double-reg)
 258                                :offset float15-offset)))
 259       (inst xorpd float15 float15))))
 260
 261 (define-vop (alloc-number-stack-space)
 262   (:info amount)
 263   (:results (result :scs (sap-reg any-reg)))
 264   (:generator 0
 265     (aver (location= result rsp-tn))
 266     (unless (zerop amount)
 267       (let ((delta (logandc2 (+ amount 7) 7)))
 268         (inst sub rsp-tn delta)))
 269     ;; C stack must be 16 byte aligned
 270     (inst and rsp-tn #xfffffff0)
 271     (move result rsp-tn)))
 272
 273 (define-vop (dealloc-number-stack-space)
 274   (:info amount)
 275   (:generator 0
 276     (unless (zerop amount)
 277       (let ((delta (logandc2 (+ amount 7) 7)))
 278         (inst add rsp-tn delta)))))
 279
 280 (define-vop (alloc-alien-stack-space)
 281   (:info amount)
 282   #!+sb-thread (:temporary (:sc unsigned-reg) temp)
 283   (:results (result :scs (sap-reg any-reg)))
 284   #!+sb-thread
 285   (:generator 0
 286     (aver (not (location= result rsp-tn)))
 287     (unless (zerop amount)
 288       (let ((delta (logandc2 (+ amount 7) 7)))
 289         (inst mov temp
 290               (make-ea :qword
 291                        :disp (+ nil-value
 292                                 (static-symbol-offset '*alien-stack*)
 293                                 (ash symbol-tls-index-slot word-shift)
 294                                 (- other-pointer-lowtag))))
 295         (inst sub (make-ea :qword :base thread-base-tn
 296                            :scale 1 :index temp) delta)))
 297     (load-tl-symbol-value result *alien-stack*))
 298   #!-sb-thread
 299   (:generator 0
 300     (aver (not (location= result rsp-tn)))
 301     (unless (zerop amount)
 302       (let ((delta (logandc2 (+ amount 7) 7)))
 303         (inst sub (make-ea :qword
 304                            :disp (+ nil-value
 305                                     (static-symbol-offset '*alien-stack*)
 306                                     (ash symbol-value-slot word-shift)
 307                                     (- other-pointer-lowtag)))
 308               delta)))
 309     (load-symbol-value result *alien-stack*)))
 310
 311 (define-vop (dealloc-alien-stack-space)
 312   (:info amount)
 313   #!+sb-thread (:temporary (:sc unsigned-reg) temp)
 314   #!+sb-thread
 315   (:generator 0
 316     (unless (zerop amount)
 317       (let ((delta (logandc2 (+ amount 7) 7)))
 318         (inst mov temp
 319               (make-ea :qword
 320                        :disp (+ nil-value
 321                                 (static-symbol-offset '*alien-stack*)
 322                                 (ash symbol-tls-index-slot word-shift)
 323                                 (- other-pointer-lowtag))))
 324         (inst add (make-ea :qword :base thread-base-tn :scale 1 :index temp)
 325               delta))))
 326   #!-sb-thread
 327   (:generator 0
 328     (unless (zerop amount)
 329       (let ((delta (logandc2 (+ amount 7) 7)))
 330         (inst add (make-ea :qword
 331                            :disp (+ nil-value
 332                                     (static-symbol-offset '*alien-stack*)
 333                                     (ash symbol-value-slot word-shift)
 334                                     (- other-pointer-lowtag)))
 335               delta)))))
 336
 337 ;;; these are not strictly part of the c-call convention, but are
 338 ;;; needed for the WITH-PRESERVED-POINTERS macro used for "locking
 339 ;;; down" lisp objects so that GC won't move them while foreign
 340 ;;; functions go to work.
 341
 342 (define-vop (push-word-on-c-stack)
 343     (:translate push-word-on-c-stack)
 344   (:args (val :scs (sap-reg)))
 345   (:policy :fast-safe)
 346   (:arg-types system-area-pointer)
 347   (:generator 2
 348     (inst push val)))
 349
 350 (define-vop (pop-words-from-c-stack)
 351     (:translate pop-words-from-c-stack)
 352   (:args)
 353   (:arg-types (:constant (unsigned-byte 60)))
 354   (:info number)
 355   (:policy :fast-safe)
 356   (:generator 2
 357     (inst add rsp-tn (fixnumize number))))
 358