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c-call.lisp
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c-call.lisp
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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.
(defstruct (arg-state (:copier nil))
(register-args 0)
(xmm-args 0)
(stack-frame-size 0))
(declaim (freeze-type arg-state))
(defconstant max-int-args #.(length *c-call-register-arg-offsets*))
(defconstant max-xmm-args #+win32 4 #-win32 8)
(defun int-arg (state prim-type reg-sc stack-sc)
(let ((reg-args (max (arg-state-register-args state)
#+win32 (arg-state-xmm-args state))))
(cond ((< reg-args max-int-args)
(setf (arg-state-register-args state) (1+ reg-args))
(make-wired-tn* prim-type reg-sc
(nth reg-args *c-call-register-arg-offsets*)))
(t
(let ((frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (1+ frame-size))
(make-wired-tn* prim-type stack-sc frame-size))))))
(define-alien-type-method (integer :arg-tn) (type state)
(if (alien-integer-type-signed type)
(int-arg state 'signed-byte-64 signed-reg-sc-number signed-stack-sc-number)
(int-arg state 'unsigned-byte-64 unsigned-reg-sc-number unsigned-stack-sc-number)))
(define-alien-type-method (system-area-pointer :arg-tn) (type state)
(declare (ignore type))
(int-arg state 'system-area-pointer sap-reg-sc-number sap-stack-sc-number))
(defun float-arg (state prim-type reg-sc stack-sc)
(let ((xmm-args (max (arg-state-xmm-args state)
#+win32 (arg-state-register-args state))))
(cond ((< xmm-args max-xmm-args)
(setf (arg-state-xmm-args state) (1+ xmm-args))
(make-wired-tn* prim-type reg-sc
(nth xmm-args *float-regs*)))
(t
(let ((frame-size (arg-state-stack-frame-size state)))
(setf (arg-state-stack-frame-size state) (1+ frame-size))
(make-wired-tn* prim-type stack-sc frame-size))))))
(define-alien-type-method (double-float :arg-tn) (type state)
(declare (ignore type))
(float-arg state 'double-float double-reg-sc-number double-stack-sc-number))
(define-alien-type-method (single-float :arg-tn) (type state)
(declare (ignore type))
(float-arg state 'single-float single-reg-sc-number single-stack-sc-number))
(defstruct (result-state (:copier nil))
(num-results 0))
(declaim (freeze-type result-state))
(defun result-reg-offset (slot)
(ecase slot
(0 rax-offset)
(1 rdx-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-64 signed-reg-sc-number)
(values 'unsigned-byte-64 unsigned-reg-sc-number))
(make-wired-tn* ptype reg-sc (result-reg-offset num-results)))))
(define-alien-type-method (integer :naturalize-gen) (type alien)
(if (<= (alien-type-bits type) 32)
(if (alien-integer-type-signed type)
`(sign-extend ,alien ,(alien-type-bits type))
`(logand ,alien ,(1- (ash 1 (alien-type-bits type)))))
alien))
(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))
(make-wired-tn* 'system-area-pointer sap-reg-sc-number
(result-reg-offset num-results))))
(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))
(make-wired-tn* 'double-float double-reg-sc-number num-results)))
(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))
(make-wired-tn* 'single-float single-reg-sc-number num-results)))
(define-alien-type-method (values :result-tn) (type state)
(let ((values (alien-values-type-values type)))
(when (> (length values) 2)
(error "Too many result values from c-call."))
(mapcar (lambda (type)
(invoke-alien-type-method :result-tn type state))
values)))
(defun make-call-out-tns (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)))
(values (make-wired-tn* 'positive-fixnum any-reg-sc-number rsp-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))))))
(deftransform %alien-funcall ((function type &rest args) * * :node node)
(aver (sb-c:constant-lvar-p type))
(let* ((type (sb-c:lvar-value type))
(env (sb-c::node-lexenv node))
(arg-types (alien-fun-type-arg-types type))
(result-type (alien-fun-type-result-type type)))
(aver (= (length arg-types) (length args)))
(if (or (some #'(lambda (type)
(and (alien-integer-type-p type)
(> (sb-alien::alien-integer-type-bits type) 64)))
arg-types)
(and (alien-integer-type-p result-type)
(> (sb-alien::alien-integer-type-bits result-type) 64)))
(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) 64))
;; CLH: FIXME! This should really be
;; #xffffffffffffffff. nyef says: "Passing
;; 128-bit integers to ALIEN functions on x86-64
;; believed to be broken."
(new-args `(logand ,arg #xffffffff))
(new-args `(ash ,arg -64))
(new-arg-types (parse-alien-type '(unsigned 64) env))
(if (alien-integer-type-signed type)
(new-arg-types (parse-alien-type '(signed 64) env))
(new-arg-types (parse-alien-type '(unsigned 64) env))))
(t
(new-args arg)
(new-arg-types type)))))
(cond ((and (alien-integer-type-p result-type)
(> (sb-alien::alien-integer-type-bits result-type) 64))
(let ((new-result-type
(let ((sb-alien::*values-type-okay* t))
(parse-alien-type
(if (alien-integer-type-signed result-type)
'(values (unsigned 64) (signed 64))
'(values (unsigned 64) (unsigned 64)))
env))))
`(lambda (function type ,@(lambda-vars))
(declare (ignore type))
(multiple-value-bind (low high)
(%alien-funcall function
',(make-alien-fun-type
:arg-types (new-arg-types)
:result-type new-result-type)
,@(new-args))
(logior low (ash high 64))))))
(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))))
;;; The ABI is vague about how signed sub-word integer return values
;;; are handled, but since gcc versions >=4.3 no longer do sign
;;; extension in the callee, we need to do it in the caller. FIXME:
;;; If the value to be extended is known to already be of the target
;;; type at compile time, we can (and should) elide the extension.
(defknown sign-extend ((signed-byte 64) t) fixnum
(foldable flushable movable))
(defoptimizer (sign-extend derive-type) ((x size))
(when (sb-c:constant-lvar-p size)
(specifier-type `(signed-byte ,(sb-c:lvar-value size)))))
(define-vop (sign-extend)
(:translate sign-extend)
(:policy :fast-safe)
(:args (val :scs (signed-reg)))
(:arg-types signed-num (:constant fixnum))
(:info size)
(:results (res :scs (signed-reg)))
(:result-types fixnum)
(:generator 1
(inst movsx `(,(ecase size (8 :byte) (16 :word) (32 :dword)) :qword) res val)))
#-sb-xc-host
(defun sign-extend (x size)
(declare (type (signed-byte 64) x))
(ecase size
(8 (sign-extend x size))
(16 (sign-extend x size))
(32 (sign-extend x size))))
;;; Note that if jumping _to_ the linkage entry, the jump is to the JMP instruction
;;; at entry + 0, but if jumping _via_ the linkage index, we can jump to [entry+8]
;;; which holds the ultimate address to jump to.
(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)
(:vop-var vop)
(:generator 2
#-immobile-space ; non-relocatable alien linkage table
(inst mov res (make-fixup foreign-symbol :foreign))
#+immobile-space ; relocatable alien linkage table
(cond ((sb-c::code-immobile-p vop)
(inst lea res (rip-relative-ea (make-fixup foreign-symbol :foreign))))
(t
(inst mov res (thread-slot-ea thread-alien-linkage-table-base-slot))
(inst lea res (ea (make-fixup foreign-symbol :alien-code-linkage-index) res))))))
(define-vop (foreign-symbol-dataref-sap)
(:translate foreign-symbol-dataref-sap)
(:policy :fast-safe)
(:args)
(:arg-types (:constant simple-string))
(:info foreign-symbol)
(:results (res :scs (sap-reg)))
(:result-types system-area-pointer)
(:vop-var vop)
(:generator 2
#-immobile-space ; non-relocatable alien linkage table
(inst mov res (ea (make-fixup foreign-symbol :foreign-dataref)))
#+immobile-space ; relocatable alien linkage table
(cond ((sb-c::code-immobile-p vop)
(inst mov res (rip-relative-ea (make-fixup foreign-symbol :foreign-dataref))))
(t
(inst mov res (thread-slot-ea thread-alien-linkage-table-base-slot))
(inst mov res (ea (make-fixup foreign-symbol :alien-data-linkage-index) res))))))
#+sb-safepoint
(defconstant thread-saved-csp-offset (- (1+ sb-vm::thread-header-slots)))
(eval-when (#-sb-xc :compile-toplevel :load-toplevel :execute)
(defun destroyed-c-registers ()
;; Safepoints do not save interrupt contexts to be scanned during
;; GCing, it only looks at the stack, so if a register isn't
;; spilled it won't be visible to the GC.
#+sb-safepoint
'((:save-p t))
#-sb-safepoint
(let ((gprs (list '#:rcx '#:rdx #-win32 '#:rsi #-win32 '#:rdi
'#:r8 '#:r9 '#:r10 '#:r11))
(vars))
(append
(loop for gpr in gprs
for offset = (symbol-value (intern (concatenate 'string (symbol-name gpr) "-OFFSET") "SB-VM"))
collect `(:temporary (:sc any-reg :offset ,offset :from :eval :to :result)
,(car (push gpr vars))))
(loop for float to 15
for varname = (format nil "FLOAT~D" float)
collect `(:temporary (:sc single-reg :offset ,float :from :eval :to :result)
,(car (push (make-symbol varname) vars))))
`((:ignore ,@vars))))))
(define-vop (call-out)
(:args (function :scs (sap-reg)
:target rbx)
(args :more t))
(:results (results :more t))
;; RBX is used to first load the address, allowing the debugger to
;; determine which alien was accessed in case it's undefined.
(:temporary (:sc sap-reg :offset rbx-offset :from (:argument 0)) rbx)
(:temporary (:sc unsigned-reg :offset rax-offset :to :result) rax)
#+sb-safepoint
(:temporary (:sc unsigned-stack :from :eval :to :result) pc-save)
#+win32
(:temporary (:sc unsigned-reg :offset r15-offset :from :eval :to :result) r15)
(:ignore results)
(:vop-var vop)
(:generator 0
(move rbx function)
(emit-c-call vop rax rbx args
sb-alien::*alien-fun-type-varargs-default*
#+sb-safepoint pc-save
#+win32 rbx))
#+win32 (:ignore r15)
. #.(destroyed-c-registers))
;;; Calls to C can generally be made without loading a register
;;; with the function. We receive the function name as an info argument.
(define-vop (call-out-named)
(:args (args :more t))
(:results (results :more t))
(:info c-symbol varargsp)
(:temporary (:sc unsigned-reg :offset rax-offset :to :result) rax)
#+sb-safepoint
(:temporary (:sc unsigned-stack :from :eval :to :result) pc-save)
#+win32
(:temporary (:sc unsigned-reg :offset r15-offset :from :eval :to :result) r15)
#+win32
(:ignore r15)
#+win32
(:temporary (:sc unsigned-reg :offset rbx-offset :from :eval :to :result) rbx)
(:ignore results)
(:vop-var vop)
(:generator 0
(emit-c-call vop rax c-symbol args varargsp
#+sb-safepoint pc-save
#+win32 rbx))
. #.(destroyed-c-registers))
#+win32
(defconstant win64-seh-direct-thunk-addr win64-seh-data-addr)
#+win32
(defconstant win64-seh-indirect-thunk-addr (+ win64-seh-data-addr 8))
(defun emit-c-call (vop rax fun args varargsp #+sb-safepoint pc-save #+win32 rbx)
(declare (ignorable varargsp))
;; Current PC - don't rely on function to keep it in a form that
;; GC understands
#+sb-safepoint
(let ((label (gen-label)))
;; This looks unnecessary. GC can look at the stack word physically below
;; the CSP-around-foreign-call, which must be a PC pointing into the lisp caller.
;; A more interesting question would arise if we had callee-saved registers
;; within lisp code, which we don't at the moment. If we did, those
;; wouldn't be anywhere on the stack unless C code decides to save them.
(inst lea rax (rip-relative-ea label))
(emit-label label)
(move pc-save rax))
(when (sb-c:msan-unpoison sb-c:*compilation*)
(inst mov rax (thread-slot-ea thread-msan-param-tls-slot))
;; Unpoison parameters
(do ((n 0 (+ n n-word-bytes))
(arg args (tn-ref-across arg)))
((null arg))
;; KLUDGE: assume all parameters are 8 bytes or less
(inst mov :qword (ea n rax) 0)))
#-win32
;; ABI: AL contains amount of arguments passed in XMM registers
;; for vararg calls.
(when varargsp
(move-immediate rax
(loop for tn-ref = args then (tn-ref-across tn-ref)
while tn-ref
count (eq (sb-name (sc-sb (tn-sc (tn-ref-tn tn-ref))))
'float-registers))))
;; Store SP in thread struct, unless the enclosing block says not to
#+sb-safepoint
(when (policy (sb-c::vop-node vop) (/= sb-c:insert-safepoints 0))
(inst mov (thread-slot-ea thread-saved-csp-offset) rsp-tn))
#+win32 (inst sub rsp-tn #x20) ;MS_ABI: shadow zone
;; From immobile space we use the "CALL rel32" format to the linkage
;; table jump, and from dynamic space we use "CALL [ea]" format
;; where ea is the address of the linkage table entry's operand.
;; So while the former is a jump to a jump, we can optimize out
;; one jump in an ELF executable.
;; N.B.: if you change how the call is emitted, you will also have to adjust
;; the UNDEFINED-ALIEN-TRAMP lisp asm routine to recognize the various shapes
;; this instruction sequence can take.
#-win32
(pseudo-atomic (:elide-if (not (call-out-pseudo-atomic-p vop)))
(inst call (if (tn-p fun)
fun
#-immobile-space (ea (make-fixup fun :foreign 8))
#+immobile-space
(cond ((sb-c::code-immobile-p vop) (make-fixup fun :foreign))
(t
;; Pick r10 as the lowest unused clobberable register.
;; RAX has a designated purpose, and RBX is nonvolatile (not always
;; spilled by Lisp because a C function has to save it if used)
(inst mov r10-tn (thread-slot-ea thread-alien-linkage-table-base-slot))
(ea (make-fixup fun :alien-code-linkage-index 8) r10-tn))))))
;; On win64, we don't support immobile space (yet) and calls go through one of
;; the thunks defined in set_up_win64_seh_data(). If the linkage table is
;; involved, RBX either points to a linkage table trampoline or to the linkage
;; table operand; this simplifies UNDEFINED-ALIEN-TRAMP's job.
#+win32
(cond ((tn-p fun)
(move rbx fun)
(inst mov rax win64-seh-direct-thunk-addr)
(inst call rax))
(t
(inst mov rbx (make-fixup fun :foreign 8))
(inst mov rax win64-seh-indirect-thunk-addr)
(inst call rax)))
;; For the undefined alien error
(note-this-location vop :internal-error)
#+win32 (inst add rsp-tn #x20) ;MS_ABI: remove shadow space
;; Zero the saved CSP, unless this code shouldn't ever stop for GC
#+sb-safepoint
(when (policy (sb-c::vop-node vop) (/= sb-c:insert-safepoints 0))
(inst xor (thread-slot-ea thread-saved-csp-offset) rsp-tn)))
(define-vop (alloc-number-stack-space)
(:info amount)
(:results (result :scs (sap-reg any-reg)))
(:result-types system-area-pointer)
(:generator 0
(aver (location= result rsp-tn))
(unless (zerop amount)
(let ((delta (align-up amount 8)))
(inst sub rsp-tn delta)))
;; C stack must be 16 byte aligned
(inst and rsp-tn -16)
(move result rsp-tn)))
(macrolet ((alien-stack-ptr ()
#+sb-thread '(symbol-known-tls-cell '*alien-stack-pointer*)
#-sb-thread '(static-symbol-value-ea '*alien-stack-pointer*)))
(define-vop (alloc-alien-stack-space)
(:info amount)
(:results (result :scs (sap-reg any-reg)))
(:result-types system-area-pointer)
(:generator 0
(aver (not (location= result rsp-tn)))
(unless (zerop amount)
(let ((delta (align-up amount 8)))
(inst sub :qword (alien-stack-ptr) delta)))
(inst mov result (alien-stack-ptr)))))
;;; Callbacks
#-sb-xc-host
(defun alien-callback-accessor-form (type sp offset)
`(deref (sap-alien (sap+ ,sp ,offset) (* ,type))))
#-sb-xc-host
(defun alien-callback-assembler-wrapper (index result-type argument-types)
(labels ((make-tn-maker (sc-name)
(lambda (offset)
(make-random-tn :kind :normal
:sc (sc-or-lose sc-name)
:offset offset))))
(let* ((segment (make-segment))
(rax rax-tn)
#+win32 (rcx rcx-tn)
#-(and win32 sb-thread) (rdi rdi-tn)
#-(and win32 sb-thread) (rsi rsi-tn)
(rdx rdx-tn)
(rbp rbp-tn)
(rsp rsp-tn)
#+(and win32 sb-thread) (r8 r8-tn)
(xmm0 float0-tn)
([rsp] (ea rsp))
;; How many arguments have been copied
(arg-count 0)
;; How many arguments have been copied from the stack
(stack-argument-count #-win32 0 #+win32 4)
(gprs (mapcar (make-tn-maker 'any-reg) *c-call-register-arg-offsets*))
(fprs (mapcar (make-tn-maker 'double-reg)
;; Only 8 first XMM registers are used for
;; passing arguments
(subseq *float-regs* 0 #-win32 8 #+win32 4))))
(assemble (segment 'nil)
;; Make room on the stack for arguments.
(when argument-types
(inst sub rsp (* n-word-bytes (length argument-types))))
;; Copy arguments from registers to stack
(dolist (type argument-types)
(let ((integerp (not (alien-float-type-p type)))
;; A TN pointing to the stack location where the
;; current argument should be stored for the purposes
;; of ENTER-ALIEN-CALLBACK.
(target-tn (ea (* arg-count n-word-bytes) rsp))
;; A TN pointing to the stack location that contains
;; the next argument passed on the stack.
(stack-arg-tn (ea (* (+ 1 (length argument-types) stack-argument-count)
n-word-bytes) rsp)))
(incf arg-count)
(cond (integerp
(let ((gpr (pop gprs)))
#+win32 (pop fprs)
;; Argument not in register, copy it from the old
;; stack location to a temporary register.
(unless gpr
(incf stack-argument-count)
(setf gpr rax)
(inst mov gpr stack-arg-tn))
;; Copy from either argument register or temporary
;; register to target.
(inst mov target-tn gpr)))
((or (alien-single-float-type-p type)
(alien-double-float-type-p type))
(let ((fpr (pop fprs)))
#+win32 (pop gprs)
(cond (fpr
;; Copy from float register to target location.
(inst movq target-tn fpr))
(t
;; Not in float register. Copy from stack to
;; temporary (general purpose) register, and
;; from there to the target location.
(incf stack-argument-count)
(inst mov rax stack-arg-tn)
(inst mov target-tn rax)))))
(t
(bug "Unknown alien floating point type: ~S" type)))))
#-sb-thread
(progn
;; arg0 to ENTER-ALIEN-CALLBACK (trampoline index)
(inst mov rdx (fixnumize index))
;; arg1 to ENTER-ALIEN-CALLBACK (pointer to argument vector)
(inst mov rdi rsp)
;; add room on stack for return value
(inst sub rsp (if (evenp arg-count)
(* n-word-bytes 2)
n-word-bytes))
;; arg2 to ENTER-ALIEN-CALLBACK (pointer to return value)
(inst mov rsi rsp)
;; Make new frame
(inst push rbp)
(inst mov rbp rsp)
;; Call
(inst mov rax (foreign-symbol-address "funcall_alien_callback"))
(inst call rax)
;; Back! Restore frame
(inst leave))
#+sb-thread
(progn
;; arg0 to ENTER-ALIEN-CALLBACK (trampoline index)
(inst mov #-win32 rdi #+win32 rcx (fixnumize index))
;; arg1 to ENTER-ALIEN-CALLBACK (pointer to argument vector)
(inst mov #-win32 rsi #+win32 rdx rsp)
;; add room on stack for return value
(inst sub rsp (if (evenp arg-count)
(* n-word-bytes 2)
n-word-bytes))
;; arg2 to ENTER-ALIEN-CALLBACK (pointer to return value)
(inst mov #-win32 rdx #+win32 r8 rsp)
;; Make new frame
(inst push rbp)
(inst mov rbp rsp)
#+win32 (inst sub rsp #x20)
#+win32 (inst and rsp #x-20)
;; Call
#+immobile-space (inst call (static-symbol-value-ea 'callback-wrapper-trampoline))
;; do this without MAKE-FIXUP because fixup'ing does not happen when
;; assembling callbacks (probably could, but ...)
#-immobile-space
(inst call (ea (+ (foreign-symbol-address "callback_wrapper_trampoline") 8)))
;; Back! Restore frame
(inst leave))
;; Result now on top of stack, put it in the right register
(cond
((or (alien-integer-type-p result-type)
(alien-pointer-type-p result-type)
(alien-type-= #.(parse-alien-type 'system-area-pointer nil)
result-type))
(inst mov rax [rsp]))
((or (alien-single-float-type-p result-type)
(alien-double-float-type-p result-type))
(inst movq xmm0 [rsp]))
((alien-void-type-p result-type))
(t
(error "Unrecognized alien type: ~A" result-type)))
;; Pop the arguments and the return value from the stack to get
;; the return address at top of stack.
(inst add rsp (* (+ arg-count
;; Plus the return value and make sure it's aligned
(if (evenp arg-count)
2
1))
n-word-bytes))
;; Return
(inst ret))
(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)))
(make-static-vector (length buffer)
:element-type '(unsigned-byte 8)
:initial-contents buffer)))))