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;;;; the VOPs and other necessary machine specific support
;;;; routines for call-out to C
;;;; This software is part of the SBCL system. See the README file for
;;;; more information.
;;;;
;;;; This software is derived from the CMU CL system, which was
;;;; written at Carnegie Mellon University and released into the
;;;; public domain. The software is in the public domain and is
;;;; provided with absolutely no warranty. See the COPYING and CREDITS
;;;; files for more information.
(in-package "SB!VM")
;; The MOVE-ARG vop is going to store args on the stack for
;; call-out. These tn's will be used for that. move-arg is normally
;; used for things going down the stack but C wants to have args
;; indexed in the positive direction.
(defun my-make-wired-tn (prim-type-name sc-name offset)
(make-wired-tn (primitive-type-or-lose prim-type-name)
(sc-number-or-lose sc-name)
offset))
(defstruct (arg-state (:copier nil))
(stack-frame-size 0))
(define-alien-type-method (integer :arg-tn) (type state)
(let ((stack-frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
(multiple-value-bind (ptype stack-sc)
(if (alien-integer-type-signed type)
(values 'signed-byte-32 'signed-stack)
(values 'unsigned-byte-32 'unsigned-stack))
(my-make-wired-tn ptype stack-sc stack-frame-size))))
(define-alien-type-method (system-area-pointer :arg-tn) (type state)
(declare (ignore type))
(let ((stack-frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
(my-make-wired-tn 'system-area-pointer
'sap-stack
stack-frame-size)))
#!+long-float
(define-alien-type-method (long-float :arg-tn) (type state)
(declare (ignore type))
(let ((stack-frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (+ stack-frame-size 3))
(my-make-wired-tn 'long-float 'long-stack stack-frame-size)))
(define-alien-type-method (double-float :arg-tn) (type state)
(declare (ignore type))
(let ((stack-frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (+ stack-frame-size 2))
(my-make-wired-tn 'double-float 'double-stack stack-frame-size)))
(define-alien-type-method (single-float :arg-tn) (type state)
(declare (ignore type))
(let ((stack-frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (1+ stack-frame-size))
(my-make-wired-tn 'single-float 'single-stack stack-frame-size)))
(defstruct (result-state (:copier nil))
(num-results 0))
(defun result-reg-offset (slot)
(ecase slot
(0 eax-offset)
(1 edx-offset)))
(define-alien-type-method (integer :result-tn) (type state)
(let ((num-results (result-state-num-results state)))
(setf (result-state-num-results state) (1+ num-results))
(multiple-value-bind (ptype reg-sc)
(if (alien-integer-type-signed type)
(values 'signed-byte-32 'signed-reg)
(values 'unsigned-byte-32 'unsigned-reg))
(my-make-wired-tn ptype reg-sc (result-reg-offset num-results)))))
(define-alien-type-method (system-area-pointer :result-tn) (type state)
(declare (ignore type))
(let ((num-results (result-state-num-results state)))
(setf (result-state-num-results state) (1+ num-results))
(my-make-wired-tn 'system-area-pointer 'sap-reg
(result-reg-offset num-results))))
#!+long-float
(define-alien-type-method (long-float :result-tn) (type state)
(declare (ignore type))
(let ((num-results (result-state-num-results state)))
(setf (result-state-num-results state) (1+ num-results))
(my-make-wired-tn 'long-float 'long-reg (* num-results 2))))
(define-alien-type-method (double-float :result-tn) (type state)
(declare (ignore type))
(let ((num-results (result-state-num-results state)))
(setf (result-state-num-results state) (1+ num-results))
(my-make-wired-tn 'double-float 'double-reg (* num-results 2))))
(define-alien-type-method (single-float :result-tn) (type state)
(declare (ignore type))
(let ((num-results (result-state-num-results state)))
(setf (result-state-num-results state) (1+ num-results))
(my-make-wired-tn 'single-float 'single-reg (* num-results 2))))
#+nil ;;pfw obsolete now?
(define-alien-type-method (values :result-tn) (type state)
(mapcar (lambda (type)
(invoke-alien-type-method :result-tn type state))
(alien-values-type-values type)))
;;; pfw - from alpha
(define-alien-type-method (values :result-tn) (type state)
(let ((values (alien-values-type-values type)))
(when (cdr values)
(error "Too many result values from c-call."))
(when values
(invoke-alien-type-method :result-tn (car values) state))))
(!def-vm-support-routine make-call-out-tns (type)
(let ((arg-state (make-arg-state)))
(collect ((arg-tns))
(dolist #+nil ;; this reversed list seems to cause the alien botches!!
(arg-type (reverse (alien-fun-type-arg-types type)))
(arg-type (alien-fun-type-arg-types type))
(arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
(values (my-make-wired-tn 'positive-fixnum 'any-reg esp-offset)
(* (arg-state-stack-frame-size arg-state) n-word-bytes)
(arg-tns)
(invoke-alien-type-method :result-tn
(alien-fun-type-result-type type)
(make-result-state))))))
(define-vop (foreign-symbol-address)
(:translate foreign-symbol-address)
(:policy :fast-safe)
(:args)
(:arg-types (:constant simple-string))
(:info foreign-symbol)
(:results (res :scs (sap-reg)))
(:result-types system-area-pointer)
(:generator 2
(inst lea res (make-fixup (extern-alien-name foreign-symbol) :foreign))))
(define-vop (call-out)
(:args (function :scs (sap-reg))
(args :more t))
(:results (results :more t))
;; eax is already wired
(:temporary (:sc unsigned-reg :offset ecx-offset) ecx)
(:temporary (:sc unsigned-reg :offset edx-offset) edx)
(:node-var node)
(:vop-var vop)
(:save-p t)
(:ignore args ecx edx)
(:generator 0
(cond ((policy node (> space speed))
(move eax-tn function)
(inst call (make-fixup (extern-alien-name "call_into_c") :foreign)))
(t
;; Setup the NPX for C; all the FP registers need to be
;; empty; pop them all.
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst fstp fr0-tn)
(inst call function)
;; To give the debugger a clue. XX not really internal-error?
(note-this-location vop :internal-error)
;; Restore the NPX for lisp.
(inst fldz) ; insure no regs are empty
(inst fldz)
(inst fldz)
(inst fldz)
(inst fldz)
(inst fldz)
(inst fldz)
(if (and results
(location= (tn-ref-tn results) fr0-tn))
;; The return result is in fr0.
(inst fxch fr7-tn) ; move the result back to fr0
(inst fldz)) ; insure no regs are empty
))))
(define-vop (alloc-number-stack-space)
(:info amount)
(:results (result :scs (sap-reg any-reg)))
(:generator 0
(aver (location= result esp-tn))
(unless (zerop amount)
(let ((delta (logandc2 (+ amount 3) 3)))
(inst sub esp-tn delta)))
(move result esp-tn)))
(define-vop (dealloc-number-stack-space)
(:info amount)
(:generator 0
(unless (zerop amount)
(let ((delta (logandc2 (+ amount 3) 3)))
(inst add esp-tn delta)))))
(define-vop (alloc-alien-stack-space)
(:info amount)
(:temporary (:sc unsigned-reg) temp)
(:results (result :scs (sap-reg any-reg)))
(:generator 0
(aver (not (location= result esp-tn)))
(unless (zerop amount)
(let ((delta (logandc2 (+ amount 3) 3)))
(inst mov temp
(make-ea :dword
:disp (+ nil-value
(static-symbol-offset '*alien-stack*)
(ash symbol-tls-index-slot word-shift)
(- other-pointer-lowtag))))
(inst gs-segment-prefix)
(inst sub (make-ea :dword :scale 1 :index temp) delta)))
(load-tl-symbol-value result *alien-stack*)))
(define-vop (dealloc-alien-stack-space)
(:info amount)
(:temporary (:sc unsigned-reg) temp)
(:generator 0
(unless (zerop amount)
(let ((delta (logandc2 (+ amount 3) 3)))
(inst mov temp
(make-ea :dword
:disp (+ nil-value
(static-symbol-offset '*alien-stack*)
(ash symbol-tls-index-slot word-shift)
(- other-pointer-lowtag))))
(inst gs-segment-prefix)
(inst add (make-ea :dword :scale 1 :index temp) delta)))))