source: release/1.4/source/level-0/X86/X8632/x8632-misc.lisp

;;; Copyright 2009 Clozure Associates
;;; This file is part of Clozure CL.  
;;;
;;; Clozure CL is licensed under the terms of the Lisp Lesser GNU
;;; Public License , known as the LLGPL and distributed with Clozure
;;; CL as the file "LICENSE".  The LLGPL consists of a preamble and
;;; the LGPL, which is distributed with Clozure CL as the file "LGPL".
;;; Where these conflict, the preamble takes precedence.
;;;
;;; Clozure CL is referenced in the preamble as the "LIBRARY."
;;;
;;; The LLGPL is also available online at
;;; http://opensource.franz.com/preamble.html

(in-package "CCL")

;;; Copy N bytes from pointer src, starting at byte offset src-offset,
;;; to ivector dest, starting at offset dest-offset.
;;; It's fine to leave this in lap.
;;; Depending on alignment, it might make sense to move more than
;;; a byte at a time.
;;; Does no arg checking of any kind.  Really.

;;; I went ahead and used the INC and DEC instructions here, since
;;; they're shorter than the equivalent ADD/SUB.  Intel's optimization
;;; manual advises avoiding INC and DEC because they might cause
;;; dependencies on earlier instructions that set the flags.  So, if
;;; these functions end up being hot, replacing the inc/dec insns
;;; might be worth a try.

(defx8632lapfunction %copy-ptr-to-ivector ((src 12)
                                           (src-byte-offset 8)
                                           (dest 4)
                                           #|(ra 0)|#
                                           (dest-byte-offset arg_y)
                                           (nbytes arg_z))
  (mark-as-imm temp0)
  (mark-as-imm arg_y)
  (let ((foreign-ptr temp0)             ;raw foreign pointer
        (ivector temp1)                 ;destination ivector
        (j arg_y))                      ;unboxed index into ivector
    (movl (@ src (% esp)) (% temp1))
    (macptr-ptr temp1 foreign-ptr)
    (movl (@ src-byte-offset (% esp)) (% temp1))
    (unbox-fixnum temp1 imm0)
    (addl (% imm0) (% foreign-ptr))     ;point to starting byte in src
    (movl (@ dest (% esp)) (% ivector))
    (sarl ($ x8632::fixnumshift) (% j)) ;unbox dest-byte-offset
    (testl (% nbytes) (% nbytes))
    (jmp @test)
    @loop
    (movb (@ (% foreign-ptr)) (%b imm0))
    (incl (% foreign-ptr))
    (movb (%b imm0) (@ x8632::misc-data-offset (% ivector) (% j)))
    (incl (% j))
    (subl ($ '1) (% nbytes))
    @test
    (jne @loop)
    (movl (% ivector) (% arg_z)))
  (mark-as-node temp0)
  (mark-as-node arg_y)
  (single-value-return 5))

(defx8632lapfunction %copy-ivector-to-ptr ((src 12)
                                           (src-byte-offset 8)
                                           (dest 4)
                                           #|(ra 0)|#
                                           (dest-byte-offset arg_y)
                                           (nbytes arg_z))
  (mark-as-imm temp0)
  (mark-as-imm arg_y)
  (let ((foreign-ptr temp0)             ;raw foreign pointer
        (ivector temp1)                 ;source ivector
        (j arg_y))                      ;unboxed index into ivector
    (movl (@ dest (% esp)) (% temp1))
    (macptr-ptr temp1 foreign-ptr)
    (unbox-fixnum dest-byte-offset imm0)
    (addl (% imm0) (% foreign-ptr))     ;point to starting byte in dest
    (movl (@ src (% esp)) (% ivector))
    (movl (@ src-byte-offset (% esp)) (% j))
    (sarl ($ x8632::fixnumshift) (% j)) ;unbox src-byte-offset
    (test (% nbytes) (% nbytes))
    (jmp @test)
    @loop
    (movb (@ x8632::misc-data-offset (% ivector) (% j)) (%b imm0))
    (incl (% j))
    (movb (%b imm0) (@ (% foreign-ptr)))
    (incl (% foreign-ptr))
    (subl ($ '1) (% nbytes))
    @test
    (jne @loop)
    (movl (@ dest (% esp)) (% arg_z)))
  (mark-as-node temp0)
  (mark-as-node arg_y)
  (single-value-return 5))

(defx8632lapfunction %copy-ivector-to-ivector ((src 12) 
                                               (src-byte-offset 8)
                                               (dest 4)
                                               #|(ra 0)|#
                                               (dest-byte-offset arg_y)
                                               (nbytes arg_z))
  (movl (@ src (% esp)) (% temp0))
  (movl (@ src-byte-offset (% esp)) (% temp1))
  (unbox-fixnum nbytes imm0)            ;will be used below
  (push (% nbytes))                     ;put loop counter on stack
  (movl (@ (+ 4 dest) (% esp)) (% arg_z))
  (mark-as-imm temp1)
  (mark-as-imm arg_y)
  (sarl ($ x8632::fixnumshift) (% temp1)) ;unboxed src index
  (sarl ($ x8632::fixnumshift) (% arg_y)) ;unboxed dest index
  (let ((a temp0)
        (i temp1)
        (b arg_z)
        (j arg_y))
    ;; copy nbytes starting at a[i] to b[j]
    (cmpl (% b) (% a))
    (jne @front)
    (cmpl (% i) (% j))
    (jg @back)
    @front
    (testl (% imm0) (% imm0))           ;test nbytes
    (jmp @front-test)
    @front-loop
    (movb (@ x8632::misc-data-offset (% a) (% i)) (%b imm0))
    (movb (%b imm0) (@ x8632::misc-data-offset (% b) (% j)))
    (incl (% i))
    (incl (% j))
    (subl ($ '1) (@ (% esp)))
    @front-test
    (jne @front-loop)
    (jmp @done)
    @back
    ;; unboxed nbytes in imm0
    (addl (% imm0) (% i))
    (addl (% imm0) (% j))
    (testl (% imm0) (% imm0))
    (jmp @back-test)
    @back-loop
    (decl (% i))
    (decl (% j))
    (movb (@ x8632::misc-data-offset (% a) (% i)) (%b imm0))
    (movb (%b imm0) (@ x8632::misc-data-offset (% b) (% j)))
    (subl ($ '1) (@ (% esp)))
    @back-test
    (jne @back-loop)
    @done
    ;; dest already in arg_z
    (addl ($ 4) (% esp))                ;pop nbytes
    (mark-as-node temp1)
    (mark-as-node arg_y)
    (single-value-return 5)))

(defx8632lapfunction %copy-gvector-to-gvector ((src 12)
                                               (src-element 8)
                                               (dest 4)
                                               #|(ra 0)|#
                                               (dest-element arg_y)
                                               (nelements arg_z))
  (let ((a temp0)
        (i imm0)
        (b arg_z)
        (j arg_y)
        (val temp1))
    (movl (% nelements) (% val))     ;will be used below
    (push (% nelements))             ;loop counter on stack (use ebp?)
    (movl (@ (+ 4 src) (% esp)) (% a))
    (movl (@ (+ 4 src-element) (% esp)) (% i))
    (movl (@ (+ 4 dest) (% esp)) (% b))
    ;; j/arg_y already set
    (cmpl (% a) (% b))
    (jne @front)
    (rcmp (% i) (% j))
    (jl @back)
    @front
    (testl (% val) (% val))             ;test nelements
    (jmp @front-test)
    @front-loop
    (movl (@ x8632::misc-data-offset (% a) (% i)) (% val))
    (movl (% val) (@ x8632::misc-data-offset (% b) (% j)))
    (addl ($ '1) (% i))
    (addl ($ '1) (% j))
    (subl ($ '1) (@ (% esp)))
    @front-test
    (jne @front-loop)
    (jmp @done)
    @back
    ;; nelements in val (from above)
    (addl (% val) (% i))
    (addl (% val) (% j))
    (testl (% val) (% val))
    (jmp @back-test)
    @back-loop
    (subl ($ '1) (% i))
    (subl ($ '1) (% j))
    (movl (@ x8632::misc-data-offset (% a) (% i)) (% val))
    (movl (% val) (@ x8632::misc-data-offset (% b) (% j)))
    (subl ($ '1) (@ (% esp)))
    @back-test
    (jne @back-loop)
    @done
    ;; dest already in arg_z
    (addl ($ 4) (% esp))                ;pop loop counter
    (single-value-return 5)))

(defx8632lapfunction %heap-bytes-allocated ()
  (movl (@ (% :rcontext) x8632::tcr.save-allocptr) (% temp1))
  (movl (@ (% :rcontext) x8632::tcr.last-allocptr) (% temp0))
  (cmpl ($ -8) (% temp1))               ;void_allocptr
  (movq (@ (% :rcontext) x8632::tcr.total-bytes-allocated-low) (% mm0))
  (jz @go)
  (movl (% temp0) (% arg_y))
  (subl (% temp1) (% temp0))
  (testl (% arg_y) (% arg_y))
  (jz @go)
  (movd (% temp0) (% mm1))
  (paddq (% mm1) (% mm0))
  @go
  (jmp-subprim .SPmakeu64))

(defx8632lapfunction values ()
  (:arglist (&rest values))
  (save-frame-variable-arg-count)
  (push-argregs)
  (jmp-subprim .SPnvalret))

(defx8632lapfunction rdtsc ()
  (mark-as-imm temp1)                   ;aka edx
  (:byte #x0f)                          ;two-byte rdtsc opcode
  (:byte #x31)                          ;is #x0f #x31
  (box-fixnum imm0 arg_z)
  (mark-as-node temp1)
  (single-value-return))

;;; Return all 64 bits of the time-stamp counter as an unsigned integer.
(defx8632lapfunction rdtsc64 ()
  (mark-as-imm temp1)                   ;aka edx
  (:byte #x0f)                          ;two-byte rdtsc opcode
  (:byte #x31)                          ;is #x0f #x31
  (movd (% eax) (% mm0))
  (movd (% edx) (% mm1))
  (psllq ($ 32) (% mm1))
  (por (% mm1) (% mm0))
  (mark-as-node temp1)
  (jmp-subprim .SPmakeu64))

;;; It would be nice if (%setf-macptr macptr (ash (the fixnum value)
;;; ash::fixnumshift)) would do this inline.

(defx8632lapfunction %setf-macptr-to-object ((macptr arg_y) (object arg_z))
  (check-nargs 2)
  (trap-unless-typecode= macptr x8632::subtag-macptr)
  (movl (% object) (@ x8632::macptr.address (% macptr)))
  (single-value-return))

(defx8632lapfunction %fixnum-from-macptr ((macptr arg_z))
  (check-nargs 1)
  (trap-unless-typecode= arg_z x8632::subtag-macptr)
  (movl (@ x8632::macptr.address (% arg_z)) (% imm0))
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (trap-unless-lisptag= imm0 x8632::tag-fixnum imm1))
  (mark-as-node temp0)
  (movl (% imm0) (% arg_z))
  (single-value-return))

(defx8632lapfunction %%get-unsigned-longlong ((ptr arg_y) (offset arg_z))
  (trap-unless-typecode= ptr x8632::subtag-macptr)
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (macptr-ptr ptr imm1)
    (unbox-fixnum offset imm0)
    (movq (@ (% imm1) (% imm0)) (% mm0)))
  (mark-as-node temp0)
  (jmp-subprim .SPmakeu64))

(defx8632lapfunction %%get-signed-longlong ((ptr arg_y) (offset arg_z))
  (trap-unless-typecode= ptr x8632::subtag-macptr)
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (macptr-ptr ptr imm1)
    (unbox-fixnum offset imm0)
    (movq (@ (% imm1) (% imm0)) (% mm0)))
  (mark-as-node temp0)
  (jmp-subprim .SPmakes64))

(defx8632lapfunction %%set-unsigned-longlong ((ptr 4)
                                              #|(ra 0)|#
                                              (offset arg_y)
                                              (val arg_z))
  (let ((rptr temp0)
        (imm1 temp1)
        (ptr-in-frame -4))
    (save-stackargs-frame 1)
    (movl (@ ptr-in-frame (% ebp)) (% rptr))
    (trap-unless-typecode= rptr x8632::subtag-macptr)
    (call-subprim .SPgetu64)
    (macptr-ptr rptr imm0)
    (mark-as-imm temp1)
    (unbox-fixnum offset imm1)
    (movq (% mm0) (@ (% imm0) (% imm1)))
    (mark-as-node temp1)
    (restore-simple-frame)
    (single-value-return)))

(defx8632lapfunction %%set-signed-longlong ((ptr 4)
                                            #|(ra 0)|#
                                            (offset arg_y)
                                            (val arg_z))
  (let ((rptr temp0)
        (imm1 temp1)
        (ptr-in-frame -4))
    (save-stackargs-frame 1)
    (movl (@ ptr-in-frame (% ebp)) (% rptr))
    (trap-unless-typecode= rptr x8632::subtag-macptr)
    (call-subprim .SPgets64)
    (macptr-ptr rptr imm0)
    (mark-as-imm temp1)
    (unbox-fixnum offset imm1)
    (movq (% mm0) (@ (% imm0) (% imm1)))
    (mark-as-node temp1)
    (restore-simple-frame)
    (single-value-return)))

(defx8632lapfunction interrupt-level ()
  (movl (@ (% :rcontext) x8632::tcr.tlb-pointer) (% imm0))
  (movl (@ x8632::interrupt-level-binding-index (% imm0)) (% arg_z))
  (single-value-return))

(defx8632lapfunction set-interrupt-level ((new arg_z))
  (movl (@ (% :rcontext) x8632::tcr.tlb-pointer) (% imm0))
  (trap-unless-fixnum new)
  (movl (% new) (@ x8632::interrupt-level-binding-index (% imm0)))
  (single-value-return))

(defx8632lapfunction %current-tcr ()
  (movl (@ (% :rcontext) x8632::tcr.linear) (% arg_z))
  (single-value-return))

(defx8632lapfunction %tcr-toplevel-function ((tcr arg_z))
  (check-nargs 1)
  (movl (@ x8632::tcr.vs-area (% tcr)) (% temp0))
  (movl (@ x8632::area.high (% temp0)) (% imm0)) ;bottom of vstack
  (cmpl (% tcr) (@ (% :rcontext) x8632::tcr.linear))
  (jz @myself)
  (cmpl (% imm0) (@ x8632::area.active (% temp0)))
  (jmp @finish)
  @myself
  (cmpl (% imm0) (% esp))
  @finish
  (movl ($ (target-nil-value)) (% arg_z))
  (cmovnel (@ (- x8632::node-size) (% imm0)) (% arg_z))
  (single-value-return))
  
(defx8632lapfunction %set-tcr-toplevel-function ((tcr arg_y) (fun arg_z))
  (check-nargs 2)
  (movl (@ x8632::tcr.vs-area (% tcr)) (% temp0))
  (movl (@ x8632::area.high (% temp0)) (% imm0))
  (cmpl (% tcr) (@ (% :rcontext) x8632::tcr.linear))
  (jz @myself)
  (cmpl (% imm0) (@ x8632::area.active (% temp0))) ;vstack empty?
  (jmp @room)
  @myself
  (cmpl (% imm0) (% esp))
  @room
  (leal (@ (- x8632::node-size) (% imm0)) (% imm0))
  (movl ($ 0) (@ (% imm0)))
  (jne @have-room)
  (movl (% imm0) (@ x8632::area.active (% temp0)))
  (movl (% imm0) (@ x8632::tcr.save-vsp (% tcr)))
  (jmp @have-room)
  @have-room
  (movl (% fun) (@ (% imm0)))
  (single-value-return))

;;; This needs to be done out-of-line, to handle EGC memoization.
(defx8632lapfunction %store-node-conditional ((offset 8)
                                              (object 4)
                                              #|(ra 0)|#
                                              (old arg_y)
                                              (new arg_z))
  (movl (@ offset (% esp)) (% temp0))
  (movl (@ object (% esp)) (% temp1))
  (save-simple-frame)
  (call-subprim .SPstore-node-conditional)
  (restore-simple-frame)
  (single-value-return 4))

(defx8632lapfunction %store-immediate-conditional ((offset 8)
                                                   (object 4)
                                                   #|(ra 0)|#
                                                   (old arg_y)
                                                   (new arg_z))
  (mark-as-imm temp0)
  (let ((imm1 temp0)
        (robject temp1))
    (movl (@ offset (% esp)) (% imm1))
    (sarl ($ x8632::fixnumshift) (% imm1))
    (movl (@ object (% esp)) (% robject))
    @again
    (movl (@ (% robject) (% imm1)) (% eax))
    (cmpl (% eax) (% old))
    (jne @lose)
    (lock)
    (cmpxchgl (% new) (@ (% robject) (% imm1)))
    (jne @again)
    (movl ($ (target-t-value)) (% arg_z))
    (mark-as-node temp0)
    (single-value-return 4)
    @lose
    (movl ($ (target-nil-value)) (% arg_z))
    (mark-as-node temp0)
    (single-value-return 4)))

(defx8632lapfunction set-%gcable-macptrs% ((ptr arg_z))
  @again
  (movl (@ (+ (target-nil-value) (x8632::kernel-global gcable-pointers))) (% eax))
  (movl (% eax) (@ x8632::xmacptr.link (% ptr)))
  (lock)
  (cmpxchgl (% ptr) (@ (+ (target-nil-value) (x8632::kernel-global gcable-pointers))))
  (jne @again)
  (single-value-return))

;;; Atomically increment or decrement the gc-inhibit-count kernel-global
;;; (It's decremented if it's currently negative, incremented otherwise.)
(defx8632lapfunction %lock-gc-lock ()
  @again
  (movl (@ (+ (target-nil-value) (x8632::kernel-global gc-inhibit-count))) (% eax))
  (lea (@ '-1 (% eax)) (% temp0))
  (lea (@ '1 (% eax)) (% arg_z))
  (test (% eax) (% eax))
  (cmovsl (% temp0) (% arg_z))
  (lock)
  (cmpxchgl (% arg_z) (@ (+ (target-nil-value) (x8632::kernel-global gc-inhibit-count))))
  (jnz @again)
  (single-value-return))

;;; Atomically decrement or increment the gc-inhibit-count kernel-global
;;; (It's incremented if it's currently negative, incremented otherwise.)
;;; If it's incremented from -1 to 0, try to GC (maybe just a little.)
(defx8632lapfunction %unlock-gc-lock ()
  @again
  (movl (@ (+ (target-nil-value) (x8632::kernel-global gc-inhibit-count)))
        (% eax))
  (lea (@ '1 (% eax)) (% temp0))
  (cmpl ($ -1) (% eax))
  (lea (@ '-1 (% eax)) (% arg_z))
  (cmovlel (% temp0) (% arg_z))
  (lock)
  (cmpxchgl (% arg_z) (@ (+ (target-nil-value) (x8632::kernel-global gc-inhibit-count))))
  (jne @again)
  (cmpl ($ '-1) (% eax))
  (jne @done)
  ;; The GC tried to run while it was inhibited.  Unless something else
  ;; has just inhibited it, it should be possible to GC now.
  (mov ($ arch::gc-trap-function-immediate-gc) (% imm0))
  (uuo-gc-trap)
  @done
  (single-value-return))

(defx8632lapfunction %atomic-incf-node ((by 4) #|(ra 0)|# (node arg_y) (disp arg_z))
  (check-nargs 3)
  (mark-as-imm temp0)
  (let ((imm1 temp0)
        (rby temp1))
    (movl (@ by (% esp)) (% rby))
    (unbox-fixnum disp imm1)
    @again
    (movl (@ (% node) (% imm1)) (% eax))
    (lea (@ (% eax) (% rby)) (% arg_z))
    (lock)
    (cmpxchgl (% arg_z) (@ (% node) (% imm1)))
    (jne @again))
  (mark-as-node temp0)
  (single-value-return 3))

(defx8632lapfunction %atomic-incf-ptr ((ptr arg_z))
  (mark-as-imm temp0)
  (mark-as-imm temp1)
  (let ((imm1 temp0)
        (imm2 temp1))
    (macptr-ptr ptr imm2)
    @again
    (movl (@ (% imm2)) (% eax))
    (lea (@ 1 (% eax)) (% imm1))
    (lock)
    (cmpxchgl (% imm1) (@ (% imm2)))
    (jne @again)
    (box-fixnum imm1 arg_z))
  (mark-as-node temp0)
  (mark-as-node temp1)
  (single-value-return))

(defx8632lapfunction %atomic-incf-ptr-by ((ptr arg_y) (by arg_z))
  (mark-as-imm temp0)
  (mark-as-imm temp1)
  (let ((imm1 temp0)
        (imm2 temp1))
    (macptr-ptr ptr imm2)
    @again
    (movl (@ (% imm2)) (% eax))
    (unbox-fixnum by imm1)
    (add (% eax) (% imm1))
    (lock)
    (cmpxchgl (% imm1) (@ (% imm2)))
    (jnz @again)
    (box-fixnum imm1 arg_z))
  (mark-as-node temp0)
  (mark-as-node temp1)
  (single-value-return))

(defx8632lapfunction %atomic-decf-ptr ((ptr arg_z))
  (mark-as-imm temp0)
  (mark-as-imm temp1)
  (let ((imm1 temp0)
        (imm2 temp1))
    (macptr-ptr ptr imm2)
    @again
    (movl (@ (% imm2)) (% eax))
    (lea (@ -1 (% eax)) (% imm1))
    (lock)
    (cmpxchgl (% imm1) (@ (% imm2)))
    (jne @again)
    (box-fixnum imm1 arg_z))
  (mark-as-node temp0)
  (mark-as-node temp1)
  (single-value-return))

(defx8632lapfunction %atomic-decf-ptr-if-positive ((ptr arg_z))
  (mark-as-imm temp0)
  (mark-as-imm temp1)
  (let ((imm1 temp0)
        (imm2 temp1))
    (macptr-ptr ptr imm2)
    @again
    (movl (@ (% imm2)) (% eax))
    (testl (% eax) (% eax))
    (lea (@ -1 (% eax)) (% imm1))
    (jz @done)
    (lock)
    (cmpxchgl (% imm1) (@ (% imm2)))
    (jnz @again)
    @done
    (box-fixnum imm1 arg_z))
  (mark-as-node temp0)
  (mark-as-node temp1)
  (single-value-return))

(defx8632lapfunction %atomic-swap-ptr ((ptr arg_y) (newval arg_z))
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (macptr-ptr arg_y imm1)
    (unbox-fixnum newval imm0)
    (lock)
    (xchgl (% imm0) (@ (% imm1)))
    (box-fixnum imm0 arg_z))
  (mark-as-node temp0)
  (single-value-return))

;;; Try to store the fixnum NEWVAL at PTR, if and only if the old value
;;; was equal to OLDVAL.  Return the old value
(defx8632lapfunction %ptr-store-conditional ((ptr 4) #|(ra 0)|# (expected-oldval arg_y) (newval arg_z))
  (mark-as-imm temp1)
  (let ((imm2 temp1))
    (movl (@ ptr (% esp)) (% temp0))
    (macptr-ptr temp0 imm2)
    (mark-as-imm temp0)
    (let ((imm1 temp0))
      @again
      (movl (@ (% imm2)) (% imm0))
      (box-fixnum imm0 imm0)
      (cmpl (% imm0) (% expected-oldval))
      (jne @done)
      (unbox-fixnum newval imm1)
      (lock)
      (cmpxchgl (% imm1) (@ (% imm2)))
      (jne @again)
      @done
      (movl (% imm0) (% arg_z)))
    (mark-as-node temp0))
  (mark-as-node temp1)
  (single-value-return 3))

(defx8632lapfunction %ptr-store-fixnum-conditional ((ptr 4) #|(ra 0)|# (expected-oldval arg_y) (newval arg_z))
  (mark-as-imm temp0)
  (let ((address temp0))
    (movl (@ ptr (% esp)) (% temp1))
    (macptr-ptr temp1 address)
    @again
    (movl (@ (% address)) (% imm0))
    (cmpl (% imm0) (% expected-oldval))
    (jne @done)
    (lock)
    (cmpxchgl (% newval) (@ (% address)))
    (jne @again)
    @done
    (movl (% imm0) (% arg_z)))
  (mark-as-node temp0)
  (single-value-return 3))

(defx8632lapfunction xchgl ((newval arg_y) (ptr arg_z))
  (unbox-fixnum newval imm0)
  (macptr-ptr ptr arg_y)                ;better be aligned
  (xchgl (% imm0) (@ (% arg_y)))
  (box-fixnum imm0 arg_z)
  (single-value-return))

(defx8632lapfunction %macptr->dead-macptr ((macptr arg_z))
  (check-nargs 1)
  (movb ($ x8632::subtag-dead-macptr) (@ x8632::misc-subtag-offset (% macptr)))
  (single-value-return))

;;; %%apply-in-frame

(defx8632lapfunction %%save-application ((flags arg_y) (fd arg_z))
  (unbox-fixnum fd imm0)
  (movd (% imm0) (% mm0))
  (unbox-fixnum flags imm0)
  (orl ($ arch::gc-trap-function-save-application) (% imm0))
  (uuo-gc-trap)
  (single-value-return))

(defx8632lapfunction %misc-address-fixnum ((misc-object arg_z))
  (check-nargs 1)
  (lea (@ x8632::misc-data-offset (% misc-object)) (% arg_z))
  (single-value-return))

(defx8632lapfunction fudge-heap-pointer ((ptr 4) #|(ra 0)|# (subtype arg_y) (len arg_z))
  (check-nargs 3)
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (movl (@ ptr (% esp)) (% temp1))
    (macptr-ptr temp1 imm1)           ; address in macptr
    (lea (@ 9 (% imm1)) (% imm0))     ; 2 for delta + 7 for alignment
    (andb ($ -8) (%b  imm0))          ; Clear low three bits to align
    (subl (% imm0) (% imm1))          ; imm1 = -delta
    (negw (%w imm1))
    (movw (%w imm1) (@  -2 (% imm0)))   ; save delta halfword
    (unbox-fixnum subtype imm1)         ; subtype at low end of imm1
    (shll ($ (- x8632::num-subtag-bits x8632::fixnum-shift)) (% len))
    (orl (% len) (% imm1))
    (movl (% imm1) (@ (% imm0)))        ; store subtype & length
    (lea (@ x8632::fulltag-misc (% imm0)) (% arg_z))) ; tag it, return it
  (mark-as-node temp0)
  (single-value-return 3))

(defx8632lapfunction %%make-disposable ((ptr arg_y) (vector arg_z))
  (check-nargs 2)
  (mark-as-imm temp0)
  (let ((imm1 temp0))
    (lea (@ (- x8632::fulltag-misc) (% vector)) (% imm0)) ; imm0 is addr = vect less tag
    (movzwl (@ -2 (% imm0)) (% imm1))     ; get delta
    (subl (% imm1) (% imm0))              ; vector addr (less tag)  - delta is orig addr
    (movl (% imm0) (@ x8632::macptr.address (% ptr))))
  (mark-as-node temp0)
  (single-value-return))

(defx8632lapfunction %vect-data-to-macptr ((vect arg_y) (ptr arg_z))
  (lea (@ x8632::misc-data-offset (% vect)) (% imm0))
  (movl (% imm0) (@ x8632::macptr.address (% ptr)))
  (single-value-return))

;;; Sadly, we have no NVRs on x8632.
(defun get-saved-register-values ()
  (values))

(defx8632lapfunction %current-db-link ()
  (movl (@ (% :rcontext) x8632::tcr.db-link) (% arg_z))
  (single-value-return))

(defx8632lapfunction %no-thread-local-binding-marker ()
  (movl ($ x8632::subtag-no-thread-local-binding) (% arg_z))
  (single-value-return))

(defx8632lapfunction pending-user-interrupt ()
  (xorl (% temp0) (% temp0))
  (ref-global x8632::intflag arg_z)
  ;; If another signal happens now, it will get ignored, same as if it happened
  ;; before whatever signal is in arg_z.  But then these are async signals, so
  ;; who can be sure it didn't actually happen just before...
  (set-global temp0 x8632::intflag)
  (single-value-return))

(defx8632lapfunction debug-trap-with-string ((arg arg_z))
  (check-nargs 1)
  (uuo-error-debug-trap-with-string)
  (single-value-return))

(defx8632lapfunction %safe-get-ptr ((src arg_y) (dest arg_z))
  (check-nargs 2)
  (save-simple-frame)
  (macptr-ptr src imm0)
  (leal (@ (:^ done) (% fn)) (% ra0))
  (movl (% imm0) (@ (% :rcontext) x8632::tcr.safe-ref-address))
  (movl (@ (% imm0)) (% imm0))
  (jmp done)
  (:tra done)
  (recover-fn)
  (movl ($ 0) (@ (% :rcontext) x8632::tcr.safe-ref-address))
  (movl (% imm0) (@ x8632::macptr.address (% dest)))
  (restore-simple-frame)
  (single-value-return))

(defx8632lapfunction %%tcr-interrupt ((target arg_z))
  (check-nargs 1)
  (ud2a)
  (:byte 4)
  (box-fixnum imm0 arg_z)
  (single-value-return))

(defx8632lapfunction %suspend-tcr ((target arg_z))
  (check-nargs 1)
  (ud2a)
  (:byte 5)
  (movzbl (%b imm0) (%l imm0))
  (testl (%l imm0) (%l imm0))
  (movl ($ (target-nil-value)) (%l arg_z))
  (cmovnel (@ (+ target::t-offset target::symbol.vcell) (% arg_z)) (%l arg_z))
  (single-value-return))

(defx8632lapfunction %suspend-other-threads ()
  (check-nargs 0)
  (ud2a)
  (:byte 6)
  (movl ($ (target-nil-value)) (%l arg_z))
  (single-value-return))

(defx8632lapfunction %resume-tcr ((target arg_z))
  (check-nargs 1)
  (ud2a)
  (:byte 7)
  (movzbl (%b imm0) (%l imm0))
  (testl (%l imm0) (%l imm0))
  (movl ($ (target-nil-value)) (%l arg_z))
  (cmovnel (@ (+ target::t-offset target::symbol.vcell) (% arg_z)) (%l arg_z))
  (single-value-return))

(defx8632lapfunction %resume-other-threads ()
  (check-nargs 0)
  (ud2a)
  (:byte 8)
  (movl ($ (target-nil-value)) (%l arg_z))
  (single-value-return))


(defx8632lapfunction %kill-tcr ((target arg_z))
  (check-nargs 1)
  (ud2a)
  (:byte 9)
  (testb (%b imm0) (%b imm0))
  (movl ($ (target-nil-value)) (%l arg_z))
  (cmovnel (@ (+ target::t-offset target::symbol.vcell) (% arg_z)) (%l arg_z))
  (single-value-return))

(defx8632lapfunction %get-spin-lock ((p arg_z))
  (check-nargs 1)
  (save-simple-frame)
  (push (% arg_z))
  @again
  (mark-as-imm temp1)
  (movl (@ -4 (% ebp)) (% arg_z))
  (macptr-ptr arg_z temp1)
  (movl (@ '*spin-lock-tries* (% fn)) (% arg_y))
  (movl (@ '*spin-lock-timeouts* (% fn)) (% arg_z))
  (movl (@ target::symbol.vcell (% arg_y)) (% arg_y))
  (movl (@ (% :rcontext) x8632::tcr.linear) (% temp0))
  @try-swap
  (xorl (% eax) (% eax))
  (lock)
  (cmpxchgl (% temp0) (@ (% temp1)))
  (je @done)
  @spin
  (pause)
  (cmpl ($ 0) (@ (% temp1)))
  (je @try-swap)
  (subl ($ '1) (% arg_y))
  (jne @spin)
  @wait
  (addl ($ x8632::fixnumone) (@ x8632::symbol.vcell (% arg_z)))
  (mark-as-node temp1)
  (call-symbol yield 0)
  (jmp @again)
  @done
  (mark-as-node temp1)
  (movl (@ -4 (% ebp)) (% arg_z))
  (restore-simple-frame)
  (single-value-return))

;; tbd
(defx8632lapfunction %%apply-in-frame-proto ()
  (hlt))

(defx8632lapfunction %atomic-pop-static-cons ()
  @again
  (movl (@ (+ (target-nil-value) (x8632::kernel-global static-conses))) (% eax))
  (cmpl ($ (target-nil-value)) (% eax))
  (jz @lose)
  (%cdr eax temp0)
  (lock)
  (cmpxchgl (% temp0) (@ (+ (target-nil-value) (x8632::kernel-global static-conses))))
  (jnz @again)
  @lose
  (movl (% eax) (% arg_z))
  (single-value-return))

(defx8632lapfunction %augment-static-conses ((head arg_y) (tail arg_z))
  @again
  (movl (@ (+ (target-nil-value) (x8632::kernel-global static-conses))) (% eax))
  (movl (% eax) (@ target::cons.cdr (% tail)))
  (lock)
  (cmpxchgl (% head) (@ (+ (target-nil-value) (x8632::kernel-global static-conses))))
  (jnz @again)
  @lose
  (movl ($ (target-nil-value)) (% arg_z))
  (single-value-return))

(defx8632lapfunction %staticp ((x arg_z))
  (check-nargs 1)
  (ref-global tenured-area temp0)
  (movl (% x) (% imm0))
  (subl (@ target::area.low (% temp0)) (% imm0))
  (shrl ($ target::dnode-shift) (% imm0))
  (cmpl (@ target::area.static-dnodes (% temp0)) (% imm0))
  (leal (@ (% imm0) target::fixnumone) (% arg_z))
  (movl ($ (target-nil-value)) (%l imm0))
  (cmovael (% imm0) (% arg_z))
  (single-value-return))

(defx8632lapfunction %static-inverse-cons ((n arg_z))
  (check-nargs 1)
  (ref-global tenured-area temp0)
  (movl (@ target::area.low (% temp0)) (% imm0))
  (leal (@ target::fulltag-cons (% imm0) (% n) 2) (% arg_z))
  (single-value-return))

;;; Get the thread-specific value of %fs.
(defx8632lapfunction %get-fs-register ()
  (xorl (% imm0) (% imm0))
  (:byte #x66)                          ;movw %fs,%ax
  (:byte #x8c)
  (:byte #xe0)
  (box-fixnum imm0 arg_z)
  (single-value-return))

(defx8632lapfunction %get-gs-register ()
  (xorl (% imm0) (% imm0))
  (:byte #x66)                          ;movw %gs,%ax
  (:byte #x8c)
  (:byte #xe8)
  (box-fixnum imm0 arg_z)
  (single-value-return))