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;;; -*- Mode: LISP; Syntax: Common-Lisp; Base: 10; Package: x86 -*-
;;;
;;; **********************************************************************
;;; This code was written as part of the CMU Common Lisp project at
;;; Carnegie Mellon University, and has been placed in the public domain.
;;; If you want to use this code or any part of CMU Common Lisp, please contact
;;; Scott Fahlman or slisp-group@cs.cmu.edu.
;;;
(ext:file-comment
"$Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/compiler/x86/nlx.lisp,v 1.5 1997/07/11 05:24:42 dtc Exp $")
;;;
;;; **********************************************************************
;;;
;;; This file contains the VM definition of non-local exit for the x86.
;;;
;;; Written by William Lott.
;;;
;;; Debugged by Paul F. Werkowski Spring/Summer 1995.
;;; Enhancements/debugging by Douglas T. Crosher 1996.
;;;
(in-package :x86)
;;; MAKE-NLX-SP-TN -- Interface
;;;
;;; Make an environment-live stack TN for saving the SP for NLX entry.
;;;
(def-vm-support-routine make-nlx-sp-tn (env)
(environment-live-tn
(make-representation-tn *fixnum-primitive-type* any-reg-sc-number)
env))
(defun catch-block-ea (tn)
(assert (sc-is tn catch-block))
(make-ea :dword :base ebp-tn
:disp (- (* (+ (tn-offset tn) catch-block-size) word-bytes))))
;;; Save and restore dynamic environment.
;;;
;;; These VOPs are used in the reentered function to restore the appropriate
;;; dynamic environment. Currently we only save the Current-Catch and eval
;;; stack pointer. We don't need to save/restore the current unwind-protect,
;;; since unwind-protects are implicitly processed during unwinding.
;;;
;;; We don't need to save the BSP, because that is handled automatically.
;;; Make-Dynamic-State-TNs -- Interface
;;;
;;; Return a list of TNs that can be used to snapshot the dynamic state for
;;; use with the Save/Restore-Dynamic-Environment VOPs.
;;;
(def-vm-support-routine make-dynamic-state-tns ()
(make-n-tns 4 *any-primitive-type*))
(define-vop (save-dynamic-state)
(:results (catch :scs (descriptor-reg))
(eval :scs (descriptor-reg))
(oldfp :scs (descriptor-reg))
(alien-stack :scs (descriptor-reg)))
(:vop-var vop)
(:generator 13
(load-symbol-value catch lisp::*current-catch-block*)
(load-symbol-value eval lisp::*eval-stack-top*)
(load-symbol-value alien-stack *alien-stack*)
(loadw oldfp ebp-tn (- (1+ old-fp-save-offset)))))
(define-vop (restore-dynamic-state)
(:args (catch :scs (descriptor-reg))
(eval :scs (descriptor-reg))
(oldfp :scs (descriptor-reg))
(alien-stack :scs (descriptor-reg)))
(:vop-var vop)
(:generator 10
(store-symbol-value catch lisp::*current-catch-block*)
(store-symbol-value eval lisp::*eval-stack-top*)
(store-symbol-value alien-stack *alien-stack*)
(storew oldfp ebp-tn (- (1+ old-fp-save-offset)))))
(define-vop (current-stack-pointer)
(:results (res :scs (any-reg immediate-stack)))
(:generator 1
(move res esp-tn)))
(define-vop (current-binding-pointer)
(:results (res :scs (any-reg descriptor-reg)))
(:generator 1
(load-symbol-value res *binding-stack-pointer*)))
;;;; Unwind block hackery:
;;; Compute the address of the catch block from its TN, then store into the
;;; block the current Fp, Env, Unwind-Protect, and the entry PC.
(define-vop (make-unwind-block)
(:args (tn))
(:info entry-label)
(:temporary (:sc dword-reg) temp)
(:results (block :scs (any-reg)))
(:generator 22
(inst lea block (catch-block-ea tn))
(load-symbol-value temp lisp::*current-unwind-protect-block*)
(storew temp block unwind-block-current-uwp-slot)
(storew ebp-tn block unwind-block-current-cont-slot)
;; The code slot is unused - fill with 0.
(storew 0 block vm:unwind-block-current-code-slot)
(storew (make-fixup nil :code-object entry-label)
block catch-block-entry-pc-slot)))
;;; Like Make-Unwind-Block, except that we also store in the specified tag, and
;;; link the block into the Current-Catch list.
;;;
(define-vop (make-catch-block)
(:args (tn)
(tag :scs (descriptor-reg) :to (:result 1)))
(:info entry-label)
(:results (block :scs (any-reg)))
(:temporary (:sc descriptor-reg) temp)
(:generator 44
(inst lea block (catch-block-ea tn))
(load-symbol-value temp lisp::*current-unwind-protect-block*)
(storew temp block unwind-block-current-uwp-slot)
(storew ebp-tn block unwind-block-current-cont-slot)
;; The code slot is unused - fill with 0.
(storew 0 block vm:catch-block-current-code-slot)
(storew (make-fixup nil :code-object entry-label)
block catch-block-entry-pc-slot)
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(storew tag block catch-block-tag-slot)
(load-symbol-value temp lisp::*current-catch-block*)
(storew temp block catch-block-previous-catch-slot)
(store-symbol-value block lisp::*current-catch-block*)))
;;; Just set the current unwind-protect to TN's address. This instantiates an
;;; unwind block as an unwind-protect.
;;;
(define-vop (set-unwind-protect)
(:args (tn))
(:temporary (:sc dword-reg) new-uwp)
(:generator 7
(inst lea new-uwp (catch-block-ea tn))
(store-symbol-value new-uwp lisp::*current-unwind-protect-block*)))
(define-vop (unlink-catch-block)
(:temporary (:sc dword-reg) block)
(:policy :fast-safe)
(:translate %catch-breakup)
(:generator 17
(load-symbol-value block lisp::*current-catch-block*)
(loadw block block catch-block-previous-catch-slot)
(store-symbol-value block lisp::*current-catch-block*)))
(define-vop (unlink-unwind-protect)
(:temporary (:sc dword-reg) block)
(:policy :fast-safe)
(:translate %unwind-protect-breakup)
(:generator 17
(load-symbol-value block lisp::*current-unwind-protect-block*)
(loadw block block unwind-block-current-uwp-slot)
(store-symbol-value block lisp::*current-unwind-protect-block*)))
;;;; NLX entry VOPs:
#+nil ;; this is bogus?
(define-vop (nlx-entry)
(:args (sp) ; Note: we can't list an sc-restriction, 'cause any load vops
; would be inserted before the return-pc label.
(start)
(count))
(:results (values :more t))
(:temporary (:sc descriptor-reg) nil-temp move-temp)
(:info label nvals)
(:save-p :force-to-stack)
(:vop-var vop)
(:generator 30
(emit-label label)
(note-this-location vop :non-local-entry)
(cond ((zerop nvals))
((= nvals 1)
(let ((no-values (gen-label)))
;; (move (tn-ref-tn values) nil-value) -- jrd
(inst mov (tn-ref-tn values) nil-value)
(inst jecxz no-values)
;; jrd rewrote this piece. because we can't issue an sc-restriction,
;; as above, we generate a bogus EA here (see the expansion of LOADW)
;; and croak. Do the move by hand.
;; (loadw (tn-ref-tn values) start -1)
(inst mov move-temp start)
(loadw (tn-ref-tn values) move-temp -1)
(emit-label no-values)))
(t
(collect ((defaults))
(inst mov nil-temp nil-value)
(do ((i 0 (1+ i))
(tn-ref values (tn-ref-across tn-ref)))
((null tn-ref))
(let ((default-lab (gen-label))
(tn (tn-ref-tn tn-ref)))
(defaults (cons default-lab tn))
(inst cmp count (fixnum i))
(inst jmp :le default-lab)
(sc-case tn
((descriptor-reg any-reg)
;; see above -- jrd
;; (loadw tn start (- (1+ i)))
(inst mov move-temp start)
(loadw tn move-temp (- (1+ i))))
((descriptor-stack immediate-stack)
;; (loadw move-temp start (- (1+ i)))
(inst mov move-temp start)
(loadw move-temp move-temp (- (1+ i)))
(move tn move-temp)))))
(let ((defaulting-done (gen-label)))
(emit-label defaulting-done)
(assemble (*elsewhere*)
(dolist (def (defaults))
(emit-label (car def))
(move (cdr def) nil-temp))
(inst jmp defaulting-done))))))
(inst mov esp-tn sp)))
;;; see comments below regarding start arg to nlx-entry-multiple
(define-vop (nlx-entry)
(:args (sp) ; Note: we can't list an sc-restriction, 'cause any load vops
; would be inserted before the return-pc label.
(start)
(count))
(:results (values :more t))
(:temporary (:sc descriptor-reg) nil-temp move-temp)
(:info label nvals)
(:save-p :force-to-stack)
(:vop-var vop)
(:generator 30
(emit-label label)
(note-this-location vop :non-local-entry)
(cond ((zerop nvals))
((= nvals 1)
(let ((no-values (gen-label)))
;; (move (tn-ref-tn values) nil-value) -- jrd
(inst mov (tn-ref-tn values) nil-value)
(inst jecxz no-values)
(move move-temp start)
(loadw (tn-ref-tn values) move-temp -1)
(emit-label no-values)))
(t
(collect ((defaults))
(inst mov nil-temp nil-value)
(do ((i 0 (1+ i))
(tn-ref values (tn-ref-across tn-ref)))
((null tn-ref))
(let ((default-lab (gen-label))
(tn (tn-ref-tn tn-ref)))
(defaults (cons default-lab tn))
(inst cmp count (fixnum i))
(inst jmp :le default-lab)
(sc-case tn
((descriptor-reg any-reg)
;; see above -- jrd
;; (loadw tn start (- (1+ i)))
(move move-temp start)
(loadw tn move-temp (- (1+ i))))
((descriptor-stack immediate-stack)
;; (loadw move-temp start (- (1+ i)))
(move move-temp start)
(loadw move-temp move-temp (- (1+ i)))
(move tn move-temp)))))
(let ((defaulting-done (gen-label)))
(emit-label defaulting-done)
(assemble (*elsewhere*)
(dolist (def (defaults))
(emit-label (car def))
(move (cdr def) nil-temp))
(inst jmp defaulting-done))))))
(inst mov esp-tn sp)))
#+nil ;;; this is badly broken and just kept here for reference -pw
;;; actually maybe it's not so broken -- check later
(define-vop (nlx-entry-multiple)
(:args (top)
(source)
(count :target ecx))
;; Again, no SC restrictions for the args, 'cause the loading would
;; happen before the entry label.
(:info label)
;;(:temporary (:sc dword-reg :offset esi-offset) esi)
(:temporary (:sc dword-reg :offset ecx-offset :from (:argument 2)) ecx)
(:temporary (:sc dword-reg :offset esi-offset) esi)
(:temporary (:sc dword-reg :offset edi-offset) edi)
(:results (result :scs (any-reg) :from (:argument 0))
(num :scs (any-reg immediate-stack)))
(:save-p :force-to-stack)
(:vop-var vop)
(:generator 30
#+x86-lra
(progn
(align lowtag-bits #x90)
(inst lra-header-word)
(inst nop)
(inst nop)
(inst nop))
(emit-label label)
(note-this-location vop :non-local-entry)
;; Set up the result values and copy the arguments.
(move result top)
;; -- jrd. see comments above. need to do extra moves by hand, to
;; get the ea's into registers
;; (inst lea esi (make-ea :dword :base source :disp (- word-bytes)))
(inst lea edi (make-ea :dword :base result :disp (- word-bytes)))
(inst mov esi source)
(inst lea esi (make-ea :dword :base esi :disp (- word-bytes)))
(inst mov edi result)
(inst lea edi (make-ea :dword :base edi :disp (- word-bytes)))
(move ecx count) ; fixnum words == bytes
(move num ecx)
(inst shr ecx word-shift) ; word count for <rep movs>
;; If we got zero, we be done.
(inst jecxz done)
;; Copy them down.
(inst std)
(inst rep)
(inst movs :dword)
;; Reset the CSP.
DONE
(inst lea esp-tn (make-ea :dword :base edi :disp word-bytes))))
(define-vop (nlx-entry-multiple)
(:args (top)
(source)
(count :target ecx))
;; Again, no SC restrictions for the args, 'cause the loading would
;; happen before the entry label.
(:info label)
(:temporary (:sc dword-reg :offset ecx-offset :from (:argument 2)) ecx)
(:temporary (:sc dword-reg :offset esi-offset) esi)
(:temporary (:sc dword-reg :offset edi-offset) edi)
(:results (result :scs (any-reg) :from (:argument 0))
(num :scs (any-reg immediate-stack)))
(:save-p :force-to-stack)
(:vop-var vop)
(:generator 30
#+x86-lra
(progn
(align lowtag-bits #x90)
(inst lra-header-word)
(inst nop)
(inst nop)
(inst nop))
(emit-label label)
(note-this-location vop :non-local-entry)
;; The RISC implementations have old-fp-save wired to a register.
;; ir2tran calls (make-old-fp-save-location) to retrieve that tn
;; as the source address for the thrown results. Doing that here
;; provides the S0 slot as that source which is the wrong end of
;; the stack. Examination of the throw-catch-unwind process shows
;; that %ebx is the analog of OCFP here and at least in testing so
;; far does actually point (1 above) the values.
;; Actually, now it seems that 'unwind' is supposed to set up
;; edx and old-fp with certain values so that the compiler can
;; call these nlx entry points correctly. NOT.
(move esi source) ; old-fp
(inst lea esi (make-ea :dword :base esi :disp (- word-bytes)))
;; The 'top' arg contains the %esp value saved prior to creating
;; the catch block and dynamic save structures and points to where
;; the thrown values should sit.
(move edi top)
(move result edi)
;; not too sure here -- yes! this seems to be correct
(inst lea edi (make-ea :dword :base edi :disp (- word-bytes)))
(move ecx count) ; fixnum words == bytes
(move num ecx)
(inst shr ecx word-shift) ; word count for <rep movs>
;; If we got zero, we be done.
(inst jecxz done)
;; Copy them down.
(inst std)
(inst rep)
(inst movs :dword)
;; Reset the CSP (at last moved arg??)
DONE
(inst lea esp-tn (make-ea :dword :base edi :disp word-bytes))))
;;; This VOP is just to force the TNs used in the cleanup onto the stack.
;;;
(define-vop (uwp-entry)
#+info-only
(:args (target)(block)(start)(count))
(:info label)
(:save-p :force-to-stack)
(:results (block) (start) (count))
(:ignore block start count)
(:vop-var vop)
(:generator 0
#+x86-lra
(progn
(align lowtag-bits #x90)
(inst lra-header-word)
(inst nop)
(inst nop)
(inst nop))
(emit-label label)
(note-this-location vop :non-local-entry)))