-;;; routines for call-out to C.
-;;;
-;;; Written by William Lott.
-;;;
+;;;; VOPs and other 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")
-;;; Return the number of bytes needed for the current non-descriptor stack
-;;; frame. Non-descriptor stack frames must be multiples of 16 bytes under
-;;; the PPC SVr4 ABI (though the EABI may be less restrictive.) Two words
-;;; are reserved for the stack backlink and saved LR (see SB!VM::NUMBER-STACK-
-;;; DISPLACEMENT.)
-;;;
+;;; Return the number of bytes needed for the current non-descriptor
+;;; stack frame. Non-descriptor stack frames must be multiples of 16
+;;; bytes under the PPC SVr4 ABI (though the EABI may be less
+;;; restrictive). On linux, two words are reserved for the stack
+;;; backlink and saved LR (see SB!VM::NUMBER-STACK-DISPLACEMENT).
(defconstant +stack-alignment-bytes+
;; Duh. PPC Linux (and VxWorks) adhere to the EABI.
(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))
+ (sc-number-or-lose sc-name)
+ offset))
(defstruct arg-state
(gpr-args 0)
(defun int-arg (state prim-type reg-sc stack-sc)
(let ((reg-args (arg-state-gpr-args state)))
(cond ((< reg-args 8)
- (setf (arg-state-gpr-args state) (1+ reg-args))
- (my-make-wired-tn prim-type reg-sc (+ reg-args nl0-offset)))
- (t
- (let ((frame-size (arg-state-stack-frame-size state)))
- (setf (arg-state-stack-frame-size state) (1+ frame-size))
- (my-make-wired-tn prim-type stack-sc frame-size))))))
+ (setf (arg-state-gpr-args state) (1+ reg-args))
+ (my-make-wired-tn prim-type reg-sc (+ reg-args nl0-offset)))
+ (t
+ (let ((frame-size (arg-state-stack-frame-size state)))
+ (setf (arg-state-stack-frame-size state) (1+ frame-size))
+ (my-make-wired-tn prim-type stack-sc frame-size))))))
(define-alien-type-method (integer :arg-tn) (type state)
(if (alien-integer-type-signed type)
(declare (ignore type))
(let* ((fprs (arg-state-fpr-args state)))
(cond ((< fprs 8)
- (incf (arg-state-fpr-args state))
- ;; Assign outgoing FPRs starting at FP1
- (my-make-wired-tn 'single-float 'single-reg (1+ fprs)))
- (t
- (let* ((stack-offset (arg-state-stack-frame-size state)))
- (if (oddp stack-offset)
- (incf stack-offset))
- (setf (arg-state-stack-frame-size state) (+ stack-offset 2))
- (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
+ (incf (arg-state-fpr-args state))
+ ;; Assign outgoing FPRs starting at FP1
+ (my-make-wired-tn 'single-float 'single-reg (1+ fprs)))
+ (t
+ (let* ((stack-offset (arg-state-stack-frame-size state)))
+ (if (oddp stack-offset)
+ (incf stack-offset))
+ (setf (arg-state-stack-frame-size state) (+ stack-offset 2))
+ (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
#!+darwin
(define-alien-type-method (single-float :arg-tn) (type state)
(declare (ignore type))
(let* ((fprs (arg-state-fpr-args state))
- (gprs (arg-state-gpr-args state)))
+ (gprs (arg-state-gpr-args state)))
(cond ((< gprs 8) ; and by implication also (< fprs 13)
- ;; Corresponding GPR is kept empty for functions with fixed args
- (incf (arg-state-gpr-args state))
- (incf (arg-state-fpr-args state))
- ;; Assign outgoing FPRs starting at FP1
- (my-make-wired-tn 'single-float 'single-reg (1+ fprs)))
- ((< fprs 13)
- ;; According to PowerOpen ABI, we need to pass those both in the
- ;; FPRs _and_ the stack. However empiric testing on OS X/gcc
- ;; shows they are only passed in FPRs, AFAICT.
- ;;
- ;; "I" in "AFAICT" probably refers to PRM. -- CSR, still
- ;; reverse-engineering comments in 2003 :-)
- (incf (arg-state-fpr-args state))
- (incf (arg-state-stack-frame-size state))
- (my-make-wired-tn 'single-float 'single-reg (1+ fprs)))
- (t
- ;; Pass on stack only
- (let ((stack-offset (arg-state-stack-frame-size state)))
- (incf (arg-state-stack-frame-size state))
- (my-make-wired-tn 'single-float 'single-stack stack-offset))))))
+ (incf (arg-state-fpr-args state))
+ ;; Assign outgoing FPRs starting at FP1
+ (list (my-make-wired-tn 'single-float 'single-reg (1+ fprs))
+ (int-arg state 'signed-byte-32 'signed-reg 'signed-stack)))
+ ((< fprs 13)
+ ;; See comments below for double-float.
+ (incf (arg-state-fpr-args state))
+ (incf (arg-state-stack-frame-size state))
+ (my-make-wired-tn 'single-float 'single-reg (1+ fprs)))
+ (t
+ ;; Pass on stack only
+ (let ((stack-offset (arg-state-stack-frame-size state)))
+ (incf (arg-state-stack-frame-size state))
+ (my-make-wired-tn 'single-float 'single-stack stack-offset))))))
#!-darwin
(define-alien-type-method (double-float :arg-tn) (type state)
(declare (ignore type))
(let* ((fprs (arg-state-fpr-args state)))
(cond ((< fprs 8)
- (incf (arg-state-fpr-args state))
- ;; Assign outgoing FPRs starting at FP1
- (my-make-wired-tn 'double-float 'double-reg (1+ fprs)))
- (t
- (let* ((stack-offset (arg-state-stack-frame-size state)))
- (if (oddp stack-offset)
- (incf stack-offset))
- (setf (arg-state-stack-frame-size state) (+ stack-offset 2))
- (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
-
+ (incf (arg-state-fpr-args state))
+ ;; Assign outgoing FPRs starting at FP1
+ (my-make-wired-tn 'double-float 'double-reg (1+ fprs)))
+ (t
+ (let* ((stack-offset (arg-state-stack-frame-size state)))
+ (if (oddp stack-offset)
+ (incf stack-offset))
+ (setf (arg-state-stack-frame-size state) (+ stack-offset 2))
+ (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
+
#!+darwin
(define-alien-type-method (double-float :arg-tn) (type state)
(declare (ignore type))
(let ((fprs (arg-state-fpr-args state))
- (gprs (arg-state-gpr-args state)))
+ (gprs (arg-state-gpr-args state)))
(cond ((< gprs 8) ; and by implication also (< fprs 13)
- ;; Corresponding GPRs are also kept empty
- (incf (arg-state-gpr-args state) 2)
- (when (> (arg-state-gpr-args state) 8)
- ;; Spill one word to stack
- (decf (arg-state-gpr-args state))
- (incf (arg-state-stack-frame-size state)))
- (incf (arg-state-fpr-args state))
- ;; Assign outgoing FPRs starting at FP1
- (my-make-wired-tn 'double-float 'double-reg (1+ fprs)))
- ((< fprs 13)
- ;; According to PowerOpen ABI, we need to pass those both in the
- ;; FPRs _and_ the stack. However empiric testing on OS X/gcc
- ;; shows they are only passed in FPRs, AFAICT.
- (incf (arg-state-stack-frame-size state) 2)
- (incf (arg-state-fpr-args state))
- (my-make-wired-tn 'double-float 'double-reg (1+ fprs)))
- (t
- ;; Pass on stack only
- (let ((stack-offset (arg-state-stack-frame-size state)))
- (incf (arg-state-stack-frame-size state) 2)
- (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
+ (incf (arg-state-fpr-args state))
+ ;; Assign outgoing FPRs starting at FP1
+ ;;
+ ;; The PowerOpen ABI says float values are stored in float
+ ;; regs. But if we're calling a varargs function, we also
+ ;; need to put the float into some gprs. We indicate this
+ ;; to %alien-funcall ir2-convert by making a list of the
+ ;; TNs for the float reg and for the int regs.
+ ;;
+ (list (my-make-wired-tn 'double-float 'double-reg (1+ fprs))
+ (int-arg state 'signed-byte-32 'signed-reg 'signed-stack)
+ (int-arg state 'unsigned-byte-32 'unsigned-reg 'unsigned-stack)))
+ ((< fprs 13)
+ (incf (arg-state-fpr-args state))
+ (list (my-make-wired-tn 'double-float 'double-reg (1+ fprs))
+ (int-arg state 'signed-byte-32 'signed-reg 'signed-stack)
+ (int-arg state 'unsigned-byte-32 'unsigned-reg 'unsigned-stack)))
+ (t
+ ;; Pass on stack only
+ (let ((stack-offset (arg-state-stack-frame-size state)))
+ (incf (arg-state-stack-frame-size state) 2)
+ (my-make-wired-tn 'double-float 'double-stack stack-offset))))))
;;; Result state handling
(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))))
+ (result-reg-offset num-results))))
#!-darwin
(define-alien-type-method (single-float :result-tn) (type)
#!-darwin
(define-alien-type-method (values :result-tn) (type)
(mapcar #'(lambda (type)
- (invoke-alien-type-method :result-tn type))
- (alien-values-type-values type)))
+ (invoke-alien-type-method :result-tn type))
+ (alien-values-type-values type)))
#!+darwin
(define-alien-type-method (values :result-tn) (type state)
(when (> (length values) 2)
(error "Too many result values from c-call."))
(mapcar #'(lambda (type)
- (invoke-alien-type-method :result-tn type state))
- values)))
+ (invoke-alien-type-method :result-tn type state))
+ values)))
#!-darwin
(define-alien-type-method (integer :result-tn) (type)
(if (alien-integer-type-signed type)
(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))
+ (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)))))
-
+
(!def-vm-support-routine make-call-out-tns (type)
(declare (type alien-fun-type type))
(let ((arg-state (make-arg-state)))
(collect ((arg-tns))
(dolist (arg-type (alien-fun-type-arg-types type))
- (arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
+ (arg-tns (invoke-alien-type-method :arg-tn arg-type arg-state)))
(values (my-make-wired-tn 'positive-fixnum 'any-reg nsp-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)
- #!+darwin (make-result-state))))))
+ (* (arg-state-stack-frame-size arg-state) n-word-bytes)
+ (arg-tns)
+ (invoke-alien-type-method
+ :result-tn
+ (alien-fun-type-result-type type)
+ #!+darwin (make-result-state))))))
#!+darwin
(deftransform %alien-funcall ((function type &rest args))
- (assert (sb!c::constant-continuation-p type))
- (let* ((type (sb!c::continuation-value type))
- (arg-types (alien-fun-type-arg-types type))
- (result-type (alien-fun-type-result-type type)))
- (assert (= (length arg-types) (length args)))
+ (aver (sb!c::constant-lvar-p type))
+ (let* ((type (sb!c::lvar-value type))
+ (arg-types (alien-fun-type-arg-types type))
+ (result-type (alien-fun-type-result-type type)))
+ (aver (= (length arg-types) (length args)))
;; We need to do something special for 64-bit integer arguments
;; and results.
(if (or (some #'(lambda (type)
- (and (alien-integer-type-p type)
- (> (sb!alien::alien-integer-type-bits type) 32)))
- arg-types)
- (and (alien-integer-type-p result-type)
- (> (sb!alien::alien-integer-type-bits result-type) 32)))
- (collect ((new-args) (lambda-vars) (new-arg-types))
- (dolist (type arg-types)
- (let ((arg (gensym)))
- (lambda-vars arg)
- (cond ((and (alien-integer-type-p type)
- (> (sb!alien::alien-integer-type-bits type) 32))
- ;; 64-bit long long types are stored in
- ;; consecutive locations, most significant word
- ;; first (big-endian).
- (new-args `(ash ,arg -32))
- (new-args `(logand ,arg #xffffffff))
- (if (alien-integer-type-signed type)
- (new-arg-types (parse-alien-type '(signed 32) (sb!kernel:make-null-lexenv)))
- (new-arg-types (parse-alien-type '(unsigned 32) (sb!kernel:make-null-lexenv))))
- (new-arg-types (parse-alien-type '(unsigned 32) (sb!kernel:make-null-lexenv))))
- (t
- (new-args arg)
- (new-arg-types type)))))
- (cond ((and (alien-integer-type-p result-type)
- (> (sb!alien::alien-integer-type-bits result-type) 32))
- (let ((new-result-type
- (let ((sb!alien::*values-type-okay* t))
- (parse-alien-type
- (if (alien-integer-type-signed result-type)
- '(values (signed 32) (unsigned 32))
- '(values (unsigned 32) (unsigned 32)))
- (sb!kernel:make-null-lexenv)))))
- `(lambda (function type ,@(lambda-vars))
- (declare (ignore type))
- (multiple-value-bind (high low)
- (%alien-funcall function
- ',(make-alien-fun-type
- :arg-types (new-arg-types)
- :result-type new-result-type)
- ,@(new-args))
- (logior low (ash high 32))))))
- (t
- `(lambda (function type ,@(lambda-vars))
- (declare (ignore type))
- (%alien-funcall function
- ',(make-alien-fun-type
- :arg-types (new-arg-types)
- :result-type result-type)
- ,@(new-args))))))
- (sb!c::give-up-ir1-transform))))
-
-(define-vop (foreign-symbol-address)
- (:translate foreign-symbol-address)
+ (and (alien-integer-type-p type)
+ (> (sb!alien::alien-integer-type-bits type) 32)))
+ arg-types)
+ (and (alien-integer-type-p result-type)
+ (> (sb!alien::alien-integer-type-bits result-type) 32)))
+ (collect ((new-args) (lambda-vars) (new-arg-types))
+ (dolist (type arg-types)
+ (let ((arg (gensym)))
+ (lambda-vars arg)
+ (cond ((and (alien-integer-type-p type)
+ (> (sb!alien::alien-integer-type-bits type) 32))
+ ;; 64-bit long long types are stored in
+ ;; consecutive locations, most significant word
+ ;; first (big-endian).
+ (new-args `(ash ,arg -32))
+ (new-args `(logand ,arg #xffffffff))
+ (if (alien-integer-type-signed type)
+ (new-arg-types (parse-alien-type '(signed 32) (sb!kernel:make-null-lexenv)))
+ (new-arg-types (parse-alien-type '(unsigned 32) (sb!kernel:make-null-lexenv))))
+ (new-arg-types (parse-alien-type '(unsigned 32) (sb!kernel:make-null-lexenv))))
+ (t
+ (new-args arg)
+ (new-arg-types type)))))
+ (cond ((and (alien-integer-type-p result-type)
+ (> (sb!alien::alien-integer-type-bits result-type) 32))
+ (let ((new-result-type
+ (let ((sb!alien::*values-type-okay* t))
+ (parse-alien-type
+ (if (alien-integer-type-signed result-type)
+ '(values (signed 32) (unsigned 32))
+ '(values (unsigned 32) (unsigned 32)))
+ (sb!kernel:make-null-lexenv)))))
+ `(lambda (function type ,@(lambda-vars))
+ (declare (ignore type))
+ (multiple-value-bind (high low)
+ (%alien-funcall function
+ ',(make-alien-fun-type
+ :arg-types (new-arg-types)
+ :result-type new-result-type)
+ ,@(new-args))
+ (logior low (ash high 32))))))
+ (t
+ `(lambda (function type ,@(lambda-vars))
+ (declare (ignore type))
+ (%alien-funcall function
+ ',(make-alien-fun-type
+ :arg-types (new-arg-types)
+ :result-type result-type)
+ ,@(new-args))))))
+ (sb!c::give-up-ir1-transform))))
+
+(define-vop (foreign-symbol-sap)
+ (:translate foreign-symbol-sap)
+ (: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 lr res (make-fixup foreign-symbol :foreign))))
+
+#!+linkage-table
+(define-vop (foreign-symbol-dataref-sap)
+ (:translate foreign-symbol-dataref-sap)
(:policy :fast-safe)
(:args)
- (:arg-types (:constant simple-base-string))
+ (:arg-types (:constant simple-string))
(:info foreign-symbol)
(:results (res :scs (sap-reg)))
(:result-types system-area-pointer)
+ (:temporary (:scs (non-descriptor-reg)) addr)
(:generator 2
- (inst lr res (make-fixup (extern-alien-name foreign-symbol) :foreign))))
+ (inst lr addr (make-fixup foreign-symbol :foreign-dataref))
+ (loadw res addr)))
(define-vop (call-out)
(:args (function :scs (sap-reg) :target cfunc)
- (args :more t))
+ (args :more t))
(:results (results :more t))
(:ignore args results)
(:save-p t)
(:temporary (:sc any-reg :offset cfunc-offset
- :from (:argument 0) :to (:result 0)) cfunc)
+ :from (:argument 0) :to (:result 0)) cfunc)
(:temporary (:sc control-stack :offset nfp-save-offset) nfp-save)
(:temporary (:scs (non-descriptor-reg)) temp)
(:vop-var vop)
(:generator 0
(let ((cur-nfp (current-nfp-tn vop)))
(when cur-nfp
- (store-stack-tn nfp-save cur-nfp))
- (inst lr temp (make-fixup (extern-alien-name "call_into_c") :foreign))
+ (store-stack-tn nfp-save cur-nfp))
+ (inst lr temp (make-fixup "call_into_c" :foreign))
(inst mtctr temp)
(move cfunc function)
(inst bctrl)
(when cur-nfp
- (load-stack-tn cur-nfp nfp-save)))))
+ (load-stack-tn cur-nfp nfp-save)))))
(define-vop (alloc-number-stack-space)
(:temporary (:scs (unsigned-reg) :to (:result 0)) temp)
(:generator 0
(unless (zerop amount)
- (let ((delta (- (logandc2 (+ amount 8 +stack-alignment-bytes+)
- +stack-alignment-bytes+))))
- (cond ((>= delta (ash -1 16))
- (inst stwu nsp-tn nsp-tn delta))
- (t
- (inst lr temp delta)
- (inst stwux nsp-tn nsp-tn temp)))))
+ ;; FIXME: I don't understand why we seem to be adding
+ ;; NUMBER-STACK-DISPLACEMENT twice here. Weird. -- CSR,
+ ;; 2003-08-20
+ (let ((delta (- (logandc2 (+ amount number-stack-displacement
+ +stack-alignment-bytes+)
+ +stack-alignment-bytes+))))
+ (cond ((>= delta (ash -1 16))
+ (inst stwu nsp-tn nsp-tn delta))
+ (t
+ (inst lr temp delta)
+ (inst stwux nsp-tn nsp-tn temp)))))
(unless (location= result nsp-tn)
;; They are only location= when the result tn was allocated by
;; make-call-out-tns above, which takes the number-stack-displacement
(:policy :fast-safe)
(:generator 0
(unless (zerop amount)
- (let ((delta (logandc2 (+ amount 8 +stack-alignment-bytes+)
- +stack-alignment-bytes+)))
- (cond ((< delta (ash 1 16))
- (inst addi nsp-tn nsp-tn delta))
- (t
- (inst lwz nsp-tn nsp-tn 0)))))))
+ (let ((delta (logandc2 (+ amount number-stack-displacement
+ +stack-alignment-bytes+)
+ +stack-alignment-bytes+)))
+ (cond ((< delta (ash 1 16))
+ (inst addi nsp-tn nsp-tn delta))
+ (t
+ (inst lwz nsp-tn nsp-tn 0)))))))
+
+#-sb-xc-host
+(progn
+ (defun alien-callback-accessor-form (type sap offset)
+ (let ((parsed-type
+ (sb!alien::parse-alien-type type (sb!kernel:make-null-lexenv))))
+ (cond ((sb!alien::alien-integer-type-p parsed-type)
+ ;; Unaligned access is slower, but possible, so this is nice and
+ ;; simple. Also, we're a big-endian machine, so we need to get
+ ;; byte offsets correct.
+ (let ((bits (sb!alien::alien-type-bits parsed-type)))
+ (let ((byte-offset
+ (cond ((< bits n-word-bits)
+ (- n-word-bytes
+ (ceiling bits n-byte-bits)))
+ (t 0))))
+ `(deref (sap-alien (sap+ ,sap
+ ,(+ byte-offset offset))
+ (* ,type))))))
+ (t
+ `(deref (sap-alien (sap+ ,sap ,offset) (* ,type)))))))
+
+ ;;; The "Mach-O Runtime Conventions" document for OS X almost specifies
+ ;;; the calling convention (it neglects to mention that the linkage
+ ;;; area is 24 bytes).
+ (defconstant n-foreign-linkage-area-bytes 24)
+
+ ;;; Returns a vector in static space containing machine code for the
+ ;;; callback wrapper
+ (defun alien-callback-assembler-wrapper (index result-type argument-types)
+ (flet ((make-gpr (n)
+ (make-random-tn :kind :normal :sc (sc-or-lose 'any-reg) :offset n))
+ (make-fpr (n)
+ (make-random-tn :kind :normal :sc (sc-or-lose 'double-reg) :offset n)))
+ (let* ((segment (make-segment)))
+ (assemble (segment)
+ ;; To save our arguments, we follow the algorithm sketched in the
+ ;; "PowerPC Calling Conventions" section of that document.
+ ;;
+ ;; CLH: There are a couple problems here. First, we bail if
+ ;; we run out of registers. AIUI, we can just ignore the extra
+ ;; args here and we will be ok...
+ (let ((words-processed 0)
+ (gprs (mapcar #'make-gpr '(3 4 5 6 7 8 9 10)))
+ (fprs (mapcar #'make-fpr '(1 2 3 4 5 6 7 8 9 10 11 12 13)))
+ (stack-pointer (make-gpr 1)))
+ (labels ((save-arg (type words)
+ (let ((integerp (not (alien-float-type-p type)))
+ (offset (+ (* words-processed n-word-bytes)
+ n-foreign-linkage-area-bytes)))
+ (cond (integerp
+ (dotimes (k words)
+ (let ((gpr (pop gprs)))
+ (when gpr
+ (inst stw gpr stack-pointer offset))
+ (incf words-processed)
+ (incf offset n-word-bytes))))
+ ;; The handling of floats is a little ugly
+ ;; because we hard-code the number of words
+ ;; for single- and double-floats.
+ ((alien-single-float-type-p type)
+ (pop gprs)
+ (let ((fpr (pop fprs)))
+ (when fpr
+ (inst stfs fpr stack-pointer offset)))
+ (incf words-processed))
+ ((alien-double-float-type-p type)
+ (setf gprs (cddr gprs))
+ (let ((fpr (pop fprs)))
+ (when fpr
+ (inst stfd fpr stack-pointer offset)))
+ (incf words-processed 2))
+ (t
+ (bug "Unknown alien floating point type: ~S" type))))))
+ (mapc #'save-arg
+ argument-types
+ (mapcar (lambda (arg)
+ (ceiling (alien-type-bits arg) n-word-bits))
+ argument-types))))
+ ;; Set aside room for the return area just below sp, then
+ ;; actually call funcall3: funcall3 (call-alien-function,
+ ;; index, args, return-area)
+ ;;
+ ;; INDEX is fixnumized, ARGS and RETURN-AREA don't need to be
+ ;; because they're word-aligned. Kinda gross, but hey ...
+ (let* ((n-return-area-words
+ (ceiling (or (alien-type-bits result-type) 0) n-word-bits))
+ (n-return-area-bytes (* n-return-area-words n-word-bytes))
+ ;; FIXME: magic constant, and probably n-args-bytes
+ (args-size (* 3 n-word-bytes))
+ ;; FIXME: n-frame-bytes?
+ (frame-size (logandc2 (+ n-foreign-linkage-area-bytes
+ n-return-area-bytes
+ args-size
+ +stack-alignment-bytes+)
+ +stack-alignment-bytes+)))
+ (destructuring-bind (sp r0 arg1 arg2 arg3 arg4)
+ (mapcar #'make-gpr '(1 0 3 4 5 6))
+ ;; FIXME: This is essentially the same code as LR in
+ ;; insts.lisp, but attempting to use (INST LR ...) instead
+ ;; of this function results in callbacks not working. Why?
+ ;; --njf, 2006-01-04
+ (flet ((load-address-into (reg addr)
+ (let ((high (ldb (byte 16 16) addr))
+ (low (ldb (byte 16 0) addr)))
+ (inst lis reg high)
+ (inst ori reg reg low))))
+ ;; Setup the args
+
+ ;; CLH 2006/02/10 -Following JES' logic in
+ ;; x86-64/c-call.lisp, we need to access
+ ;; ENTER-ALIEN-CALLBACK through the symbol-value slot
+ ;; of SB-ALIEN::*ENTER-ALIEN-CALLBACK* to ensure that
+ ;; it works if GC moves ENTER-ALIEN-CALLBACK.
+ ;;
+ ;; old way:
+ ;; (load-address-into arg1 (get-lisp-obj-address #'enter-alien-callback))
+
+ ;; new way:
+ ;; (load-symbol arg1 'sb!alien::*enter-alien-callback*)
+ ;;
+ ;; whoops: can't use load-symbol here as null-tn might
+ ;; not be loaded with the proper value as we are
+ ;; coming in from C code. Use nil-value constant
+ ;; instead, following the logic in x86-64/c-call.lisp.
+ (load-address-into arg1 (+ nil-value (static-symbol-offset
+ 'sb!alien::*enter-alien-callback*)))
+ (loadw arg1 arg1 symbol-value-slot other-pointer-lowtag)
+
+ (inst li arg2 (fixnumize index))
+ (inst addi arg3 sp n-foreign-linkage-area-bytes)
+ ;; FIXME: This was (- (* RETURN-AREA-SIZE N-WORD-BYTES)), while
+ ;; RETURN-AREA-SIZE was (* N-RETURN-AREA-WORDS N-WORD-BYTES):
+ ;; I assume the intention was (- N-RETURN-AREA-BYTES), but who knows?
+ ;; --NS 2005-06-11
+ (inst addi arg4 sp (- n-return-area-bytes))
+ ;; FIXME! FIXME FIXME: What does this FIXME refer to?
+ ;; Save sp, setup the frame
+ (inst mflr r0)
+ (inst stw r0 sp (* 2 n-word-bytes)) ; FIXME: magic constant
+ (inst stwu sp sp (- frame-size))
+ ;; Make the call
+ (load-address-into r0 (foreign-symbol-address "funcall3"))
+ (inst mtlr r0)
+ (inst blrl))
+ ;; We're back! Restore sp and lr, load the return value from just
+ ;; under sp, and return.
+ (inst lwz sp sp 0)
+ (inst lwz r0 sp (* 2 n-word-bytes))
+ (inst mtlr r0)
+ (cond
+ ((sb!alien::alien-single-float-type-p result-type)
+ (let ((f1 (make-fpr 1)))
+ (inst lfs f1 sp (- (* n-return-area-words n-word-bytes)))))
+ ((sb!alien::alien-double-float-type-p result-type)
+ (let ((f1 (make-fpr 1)))
+ (inst lfd f1 sp (- (* n-return-area-words n-word-bytes)))))
+ ((sb!alien::alien-void-type-p result-type)
+ ;; Nothing to do
+ )
+ (t
+ (loop with gprs = (mapcar #'make-gpr '(3 4))
+ repeat n-return-area-words
+ for gpr = (pop gprs)
+ for offset from (- (* n-return-area-words n-word-bytes))
+ by n-word-bytes
+ do
+ (unless gpr
+ (bug "Out of return registers in alien-callback trampoline."))
+ (inst lwz gpr sp offset))))
+ (inst blr))))
+ (finalize-segment segment)
+ ;; Now that the segment is done, convert it to a static
+ ;; vector we can point foreign code to.
+ (let* ((buffer (sb!assem::segment-buffer segment))
+ (vector (make-static-vector (length buffer)
+ :element-type '(unsigned-byte 8)
+ :initial-contents buffer))
+ (sap (sb!sys:vector-sap vector)))
+ (sb!alien:alien-funcall
+ (sb!alien:extern-alien "ppc_flush_icache"
+ (function void
+ system-area-pointer
+ unsigned-long))
+ sap (length buffer))
+ vector)))))
projects / sbcl.git / blobdiff