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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/insts.lisp,v 1.6 1997/05/11 11:37:55 dtc Exp $")
;;;
;;; **********************************************************************
;;;
;;; Description of the x86 instruction set, for 80386 and above.
;;;
;;; Written by William Lott
;;;
;;; Debugged by Paul F. Werkowski Spring/Summer 1995.
;;; Debugging and enhancements by Douglas Crosher 1996, 1997.
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;;;
(in-package :x86)
(use-package :new-assem)
(def-assembler-params
:scheduler-p nil)
(disassem:set-disassem-params :instruction-alignment 8)
;;;; Primitive emitters.
(define-emitter emit-word 16
(byte 16 0))
(define-emitter emit-dword 32
(byte 32 0))
(define-emitter emit-byte-with-reg 8
(byte 5 3) (byte 3 0))
(define-emitter emit-mod-reg-r/m-byte 8
(byte 2 6) (byte 3 3) (byte 3 0))
(define-emitter emit-sib-byte 8
(byte 2 6) (byte 3 3) (byte 3 0))
;;;; Fixup emitters.
(defun emit-absolute-fixup (segment fixup)
(note-fixup segment :absolute fixup)
(let ((offset (fixup-offset fixup)))
(if (label-p offset)
(emit-back-patch segment 4
#'(lambda (segment posn)
(declare (ignore posn))
(emit-dword segment
(- (+ (component-header-length)
(or (label-position offset) 0) )
other-pointer-type))))
(emit-dword segment (or offset 0)))))
(defun emit-relative-fixup (segment fixup)
(note-fixup segment :relative fixup)
(emit-dword segment (or (fixup-offset fixup) 0)))
;;;; The effective-address (ea) structure.
(defun reg-tn-encoding (tn)
(declare (type tn tn))
(assert (eq (sb-name (sc-sb (tn-sc tn))) 'registers))
(let ((offset (tn-offset tn)))
(logior (ash (logand offset 1) 2)
(ash offset -1))))
(defstruct (ea
(:constructor make-ea (size &key base index scale disp))
(:print-function %print-ea))
(size nil :type (member :byte :word :dword))
(base nil :type (or tn null))
(index nil :type (or tn null))
(scale 1 :type (member 1 2 4 8))
(disp 0 :type (or (signed-byte 32) fixup)))
(defun %print-ea (ea stream depth)
(declare (ignore depth))
(cond ((or *print-escape* *print-readably*)
(print-unreadable-object (ea stream :type t)
(format stream
"~S~@[ base=~S~]~@[ index=~S~]~@[ scale=~S~]~@[ disp=~S~]"
(ea-size ea)
(ea-base ea)
(ea-index ea)
(let ((scale (ea-scale ea)))
(if (= scale 1) nil scale))
(ea-disp ea))))
(t
(format stream "~A PTR [" (symbol-name (ea-size ea)))
(when (ea-base ea)
(write-string (c::location-print-name (ea-base ea)) stream)
(when (ea-index ea)
(write-string "+" stream)))
(when (ea-index ea)
(write-string (c::location-print-name (ea-index ea)) stream))
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(unless (= (ea-scale ea) 1)
(format stream "*~A" (ea-scale ea)))
(typecase (ea-disp ea)
(null)
(integer
(format stream "~@D" (ea-disp ea)))
(t
(format stream "+~A" (ea-disp ea))))
(write-char #\] stream))))
(defun emit-ea (segment thing reg &optional allow-constants)
(etypecase thing
(tn
(ecase (sb-name (sc-sb (tn-sc thing)))
(registers
(emit-mod-reg-r/m-byte segment #b11 reg (reg-tn-encoding thing)))
(stack
;; Convert stack tns into an index off of EBP.
(let ((disp (- (* (1+ (tn-offset thing)) word-bytes))))
(cond ((< -128 disp 127)
(emit-mod-reg-r/m-byte segment #b01 reg #b101)
(emit-byte segment disp))
(t
(emit-mod-reg-r/m-byte segment #b10 reg #b101)
(emit-dword segment disp)))))
(constant
(unless allow-constants
(error
"Constant TNs can only be directly used in MOV, PUSH, and CMP."))
(emit-mod-reg-r/m-byte segment #b00 reg #b101)
(emit-absolute-fixup segment
(make-fixup nil
:code-object
(- (* (tn-offset thing) word-bytes)
other-pointer-type))))))
(ea
(let* ((base (ea-base thing))
(index (ea-index thing))
(scale (ea-scale thing))
(disp (ea-disp thing))
(mod (cond ((or (null base)
(and (eql disp 0)
(not (= (reg-tn-encoding base) #b101))))
#b00)
((and (fixnump disp) (<= -128 disp 127))
#b01)
(t
#b10)))
(r/m (cond (index #b100)
((null base) #b101)
(t (reg-tn-encoding base)))))
(emit-mod-reg-r/m-byte segment mod reg r/m)
(when (= r/m #b100)
(let ((ss (1- (integer-length scale)))
(index (if (null index)
#b100
(let ((index (reg-tn-encoding index)))
(if (= index #b100)
(error "Can't index off of ESP")
index))))
(base (if (null base)
#b101
(reg-tn-encoding base))))
(emit-sib-byte segment ss index base)))
(cond ((= mod #b01)
(emit-byte segment disp))
((or (= mod #b10) (null base))
(if (fixup-p disp)
(emit-absolute-fixup segment disp)
(emit-dword segment disp))))))
(fixup
(emit-mod-reg-r/m-byte segment #b00 reg #b101)
(emit-absolute-fixup segment thing))))
(defun fp-reg-tn-p (thing)
(and (tn-p thing)
(eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
;;;
;;; like the above, but for fp-instructions--jrd
;;;
(defun emit-fp-op (segment thing op)
(if (fp-reg-tn-p thing)
(emit-byte segment (dpb op (byte 3 3) (dpb (tn-offset thing)
(byte 3 0)
#b11000000)))
(emit-ea segment thing op)))
(defun byte-reg-p (thing)
(and (tn-p thing)
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(eq (sb-name (sc-sb (tn-sc thing))) 'registers)
(member (sc-name (tn-sc thing)) byte-sc-names)
t))
(defun byte-ea-p (thing)
(typecase thing
(ea (eq (ea-size thing) :byte))
(tn
(and (member (sc-name (tn-sc thing)) byte-sc-names) t))
(t nil)))
(defun word-reg-p (thing)
(and (tn-p thing)
(eq (sb-name (sc-sb (tn-sc thing))) 'registers)
(member (sc-name (tn-sc thing)) word-sc-names)
t))
(defun word-ea-p (thing)
(typecase thing
(ea (eq (ea-size thing) :word))
(tn (and (member (sc-name (tn-sc thing)) word-sc-names) t))
(t nil)))
(defun dword-reg-p (thing)
(and (tn-p thing)
(eq (sb-name (sc-sb (tn-sc thing))) 'registers)
(member (sc-name (tn-sc thing)) dword-sc-names)
t))
(defun dword-ea-p (thing)
(typecase thing
(ea (eq (ea-size thing) :dword))
(tn
(and (member (sc-name (tn-sc thing)) dword-sc-names) t))
(t nil)))
(defun register-p (thing)
(and (tn-p thing)
(eq (sb-name (sc-sb (tn-sc thing))) 'registers)))
(defun accumulator-p (thing)
(and (register-p thing)
(= (tn-offset thing) 0)))
(eval-when (compile load eval)
(defconstant conditions
'((:o . 0)
(:no . 1)
(:b . 2) (:nae . 2) (:c . 2)
(:nb . 3) (:ae . 3) (:nc . 3)
(:eq . 4) (:e . 4) (:z . 4)
(:ne . 5) (:nz . 5)
(:be . 6) (:na . 6)
(:nbe . 7) (:a . 7)
(:s . 8)
(:ns . 9)
(:p . 10) (:pe . 10)
(:np . 11) (:po . 11)
(:l . 12) (:nge . 12)
(:nl . 13) (:ge . 13)
(:le . 14) (:ng . 14)
(:nle . 15) (:g . 15)))
(defun conditional-opcode (condition)
(cdr (assoc condition conditions :test #'eq))))
;;;; Utilities.
#-lispworks3
(defconstant operand-size-prefix-byte #b01100110)
#+lispworks3
(eval-when (compile load eval)
(defconstant operand-size-prefix-byte #b01100110))
(defparameter *default-operand-size* :dword)
(defun maybe-emit-operand-size-prefix (segment size)
(unless (or (eq size :byte) (eq size *default-operand-size*))
(emit-byte segment operand-size-prefix-byte)))
(defun operand-size (thing)
(typecase thing
(tn
(case (sc-name (tn-sc thing))
(#.dword-sc-names
:dword)
(#.word-sc-names
:word)
(#.byte-sc-names
:byte)
;; added by jrd. float-registers is a separate size (?)
(#.float-sc-names
:float)
(#.double-sc-names
:double)
(t
(error "Can't tell the size of ~S ~S" thing (sc-name (tn-sc thing))))))
(ea
(ea-size thing))
(t
nil)))
(defun matching-operand-size (dst src)
(let ((dst-size (operand-size dst))
(src-size (operand-size src)))
(if dst-size
(if src-size
(if (eq dst-size src-size)
dst-size
(error "Size mismatch: ~S is a ~S and ~S is a ~S"
dst dst-size src src-size))
dst-size)
(if src-size
src-size
(error "Can't tell the size of either ~S or ~S."
dst src)))))
(defun emit-sized-immediate (segment size value)
(ecase size
(:byte
(emit-byte segment value))
(:word
(emit-word segment value))
(:dword
(emit-dword segment value))))
;;;; Disassembler support stuff.
(deftype reg () '(unsigned-byte 3))
#+cross-compiler
(lisp:deftype reg () '(unsigned-byte 3))
(eval-when (compile eval load)
(defparameter *default-address-size*
;; Actually, :dword is the only one really supported.
:dword)
(defparameter byte-reg-names
#(al cl dl bl ah ch dh bh))
(defparameter word-reg-names
#(ax cx dx bx sp bp si di))
(defparameter dword-reg-names
#(eax ecx edx ebx esp ebp esi edi))
(defun print-reg-with-width (value width stream dstate)
(declare (ignore dstate))
(princ (aref (ecase width
(:byte byte-reg-names)
(:word word-reg-names)
(:dword dword-reg-names))
value)
stream)
;; plus should do some source-var notes
)
(defun print-reg (value stream dstate)
(declare (type reg value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-reg-with-width value
(disassem:dstate-get-prop dstate 'width)
stream
dstate))
(defun print-word-reg (value stream dstate)
(declare (type reg value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-reg-with-width value
(or (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*)
stream
dstate))
(defun print-byte-reg (value stream dstate)
(declare (type reg value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-reg-with-width value :byte stream dstate))
(defun print-addr-reg (value stream dstate)
(declare (type reg value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-reg-with-width value *default-address-size* stream dstate))
;;; Value is a list of (BASE-REG OFFSET INDEX-REG INDEX-SCALE)
(defun print-mem-access (value stream print-size-p dstate)
(declare (type list value)
(type stream stream)
(type (member t nil) print-size-p)
(type disassem:disassem-state dstate))
(when print-size-p
(princ (disassem:dstate-get-prop dstate 'width) stream)
(princ '| PTR | stream))
(write-char #\[ stream)
(let ((firstp t))
(macrolet ((pel ((var val) &body body)
;; Print an element of the address, maybe with
;; a leading separator.
`(let ((,var ,val))
(when ,var
(unless firstp
(write-char #\+ stream))
,@body
(setq firstp nil)))))
(pel (base-reg (first value))
(print-addr-reg base-reg stream dstate))
(pel (index-reg (third value))
(print-addr-reg index-reg stream dstate)
(let ((index-scale (fourth value)))
(when (and index-scale (not (= index-scale 1)))
(write-char #\* stream)
(princ index-scale stream))))
(let ((offset (second value)))
(when (and offset (or firstp (not (zerop offset))))
(unless (or firstp (minusp offset))
(write-char #\+ stream))
(if firstp
(disassem:princ16 offset stream)
(princ offset stream))))))
(write-char #\] stream))
(defun print-reg/mem (value stream dstate)
(declare (type (or list reg) value)
(type stream stream)
(type disassem:disassem-state dstate))
(if (typep value 'reg)
(print-reg value stream dstate)
(print-mem-access value stream nil dstate)))
;; Same as print-reg/mem, but prints an explicit size indicator for
;; memory references.
(defun print-sized-reg/mem (value stream dstate)
(declare (type (or list reg) value)
(type stream stream)
(type disassem:disassem-state dstate))
(if (typep value 'reg)
(print-reg value stream dstate)
(print-mem-access value stream t dstate)))
(defun print-byte-reg/mem (value stream dstate)
(declare (type (or list reg) value)
(type stream stream)
(type disassem:disassem-state dstate))
(if (typep value 'reg)
(print-byte-reg value stream dstate)
(print-mem-access value stream t dstate)))
(defun print-label (value stream dstate)
(declare (ignore dstate))
(disassem:princ16 value stream))
;;; Returns either an integer, meaning a register, or a list of
;;; (BASE-REG OFFSET INDEX-REG INDEX-SCALE), where any component
;;; may be missing or nil to indicate that it's not used or has the
;;; obvious default value (e.g., 1 for the index-scale).
(defun prefilter-reg/mem (value dstate)
(declare (type list value)
(type disassem:disassem-state dstate))
(let ((mod (car value))
(r/m (cadr value)))
(declare (type (unsigned-byte 2) mod)
(type (unsigned-byte 3) r/m))
(cond ((= mod #b11)
;; registers
r/m)
((= r/m #b100)
;; sib byte
(let ((sib (disassem:read-suffix 8 dstate)))
(declare (type (unsigned-byte 8) sib))
(let ((base-reg (ldb (byte 3 0) sib))
(index-reg (ldb (byte 3 3) sib))
(index-scale (ldb (byte 2 6) sib)))
(declare (type (unsigned-byte 3) base-reg index-reg)
(type (unsigned-byte 2) index-scale))
(let* ((offset
(case mod
(#b00
(if (= base-reg #b101)
(disassem:read-suffix 32 dstate)
nil))
(#b01
(disassem:read-signed-suffix 8 dstate))
(#b10
(disassem:read-suffix 32 dstate)))))
(list (if (and (= mod #b00) (= base-reg #b101)) nil base-reg)
offset
(if (= index-reg #b100) nil index-reg)
(ash 1 index-scale))))))
((and (= mod #b00) (= r/m #b101))
(list nil (disassem:read-suffix 32 dstate)) )
((= mod #b00)
(list r/m))
((= mod #b01)
(list r/m (disassem:read-signed-suffix 8 dstate)))
(t ; (= mod #b10)
(list r/m (disassem:read-suffix 32 dstate))))))
;;; This is a sort of bogus prefilter that just
;;; stores the info globally for other people to use; it
;;; probably never gets printed.
(defun prefilter-width (value dstate)
(setf (disassem:dstate-get-prop dstate 'width)
(if (zerop value)
:byte
(let ((word-width
;; set by a prefix instruction
(or (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*)))
(when (not (eql word-width *default-operand-size*))
;; reset it
(setf (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*))
word-width))))
(defun offset-next (value dstate)
(declare #|(type integer value)|#
(type disassem:disassem-state dstate))
;; XXX dtc; a hack to stop the disassembler causing a fatal error;
;; probably caused by out of bounds offsets?
(if (or (null value)
(and (listp value) (null (car value))))
0
(+ (disassem:dstate-next-addr dstate) (if (listp value) (car value) value))))
(defun read-address (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-suffix (width-bits *default-address-size*) dstate))
(defun read-signed-imm-dword (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-signed-suffix 32 dstate))
(defun width-bits (width)
(ecase width
(:byte 8)
(:word 16)
(:dword 32)
(:float 32)
(:double 64)))
); eval-when
;;;; Disassembler argument types.
(disassem:define-argument-type accum
:printer #'(lambda (value stream dstate)
(declare (ignore value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-reg 0 stream dstate))
)
(disassem:define-argument-type word-accum
:printer #'(lambda (value stream dstate)
(declare (ignore value)
(type stream stream)
(type disassem:disassem-state dstate))
(print-word-reg 0 stream dstate))
)
(disassem:define-argument-type reg
:printer #'print-reg)
(disassem:define-argument-type addr-reg
:printer #'print-addr-reg)
(disassem:define-argument-type word-reg
:printer #'print-word-reg)
(disassem:define-argument-type imm-addr
:prefilter #'read-address
:printer #'print-label)
(disassem:define-argument-type imm-data
:prefilter #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-suffix
(width-bits (disassem:dstate-get-prop dstate 'width))
dstate))
)
(disassem:define-argument-type signed-imm-data
:prefilter #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(let ((width (disassem:dstate-get-prop dstate 'width)))
(disassem:read-signed-suffix (width-bits width) dstate)))
)
(disassem:define-argument-type signed-imm-byte
:prefilter #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-signed-suffix 8 dstate)))
(disassem:define-argument-type signed-imm-dword
:prefilter #'read-signed-imm-dword)
(disassem:define-argument-type imm-word
:prefilter #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(let ((width
(or (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*)))
(disassem:read-suffix (width-bits width) dstate))))
;;; Needed for the ret imm16 instruction
(disassem:define-argument-type imm-word-16
:prefilter #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-suffix 16 dstate)))
(disassem:define-argument-type reg/mem
:prefilter #'prefilter-reg/mem
:printer #'print-reg/mem)
(disassem:define-argument-type sized-reg/mem
;; Same as reg/mem, but prints an explicit size indicator for
;; memory references.
:prefilter #'prefilter-reg/mem
:printer #'print-sized-reg/mem)
(disassem:define-argument-type byte-reg/mem
:prefilter #'prefilter-reg/mem
:printer #'print-byte-reg/mem)
;;;
;;; added by jrd
;;;
(eval-when (compile load eval)
(defun print-fp-reg (value stream dstate)
(declare (ignore dstate))
(format stream "FR~D" value))
(defun prefilter-fp-reg (value dstate)
;; just return it
(declare (ignore dstate))
value)
)
(disassem:define-argument-type fp-reg
:prefilter #'prefilter-fp-reg
:printer #'print-fp-reg)
(disassem:define-argument-type width
:prefilter #'prefilter-width
:printer #'(lambda (value stream dstate)
(if ;; (zerop value)
(or (null value) (and (numberp value) (zerop value))) ; zzz jrd
(princ 'b stream)
(let ((word-width
;; set by a prefix instruction
(or (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*)))
(princ (schar (symbol-name word-width) 0) stream)))))
;;;; Disassembler instruction formats.
(eval-when (compile eval)
(defun swap-if (direction field1 separator field2)
`(:if (,direction :constant 0)
(,field1 ,separator ,field2)
(,field2 ,separator ,field1))))
(disassem:define-instruction-format (byte 8 :default-printer '(:name))
(op :field (byte 8 0))
;; optional fields
(accum :type 'accum)
(imm))
(disassem:define-instruction-format (simple 8)
(op :field (byte 7 1))
(width :field (byte 1 0) :type 'width)
;; optional fields
(accum :type 'accum)
(imm))
;;; Same as simple, but with direction bit
(disassem:define-instruction-format (simple-dir 8 :include 'simple)
(op :field (byte 6 2))
(dir :field (byte 1 1)))
;;; Same as simple, but with the immediate value occuring by default,
;;; and with an appropiate printer.
(disassem:define-instruction-format (accum-imm 8
:include 'simple
:default-printer '(:name
:tab accum ", " imm))
(imm :type 'imm-data))
(disassem:define-instruction-format (reg-no-width 8
:default-printer '(:name :tab reg))
(op :field (byte 5 3))
(reg :field (byte 3 0) :type 'word-reg)
;; optional fields
(accum :type 'word-accum)
(imm))
;;; adds a width field to reg-no-width
(disassem:define-instruction-format (reg 8 :default-printer '(:name :tab reg))
(op :field (byte 4 4))
(width :field (byte 1 3) :type 'width)
(reg :field (byte 3 0) :type 'reg)
;; optional fields
(accum :type 'accum)
(imm)
)
;;; Same as reg, but with direction bit
(disassem:define-instruction-format (reg-dir 8 :include 'reg)
(op :field (byte 3 5))
(dir :field (byte 1 4)))
(disassem:define-instruction-format (two-bytes 16
:default-printer '(:name))
(op :fields (list (byte 8 0) (byte 8 8))))
(disassem:define-instruction-format (reg-reg/mem 16
:default-printer
`(:name :tab reg ", " reg/mem))
(op :field (byte 7 1))
(width :field (byte 1 0) :type 'width)
(reg/mem :fields (list (byte 2 14) (byte 3 8))
:type 'reg/mem)
(reg :field (byte 3 11) :type 'reg)
;; optional fields
(imm))
;;; same as reg-reg/mem, but with direction bit
(disassem:define-instruction-format (reg-reg/mem-dir 16
:include 'reg-reg/mem
:default-printer
`(:name
:tab
,(swap-if 'dir 'reg/mem ", " 'reg)))
(op :field (byte 6 2))
(dir :field (byte 1 1)))
;;; Same as reg-rem/mem, but uses the reg field as a second op code.
(disassem:define-instruction-format (reg/mem 16
:default-printer '(:name :tab reg/mem))
(op :fields (list (byte 7 1) (byte 3 11)))
(width :field (byte 1 0) :type 'width)
(reg/mem :fields (list (byte 2 14) (byte 3 8))
:type 'sized-reg/mem)
;; optional fields
(imm))
;;; Same as reg/mem, but with the immediate value occuring by default,
;;; and with an appropiate printer.
(disassem:define-instruction-format (reg/mem-imm 16
:include 'reg/mem
:default-printer
'(:name :tab reg/mem ", " imm))
(reg/mem :type 'sized-reg/mem)
(imm :type 'imm-data))
;;; Same as reg/mem, but with using the accumulator in the default printer
(disassem:define-instruction-format
(accum-reg/mem 16
:include 'reg/mem :default-printer '(:name :tab accum ", " reg/mem))
(reg/mem :type 'reg/mem) ; don't need a size
(accum :type 'accum))
;;; Same as reg-reg/mem, but with a prefix of #b00001111
(disassem:define-instruction-format (ext-reg-reg/mem 24
:default-printer
`(:name :tab reg ", " reg/mem))
(prefix :field (byte 8 0) :value #b00001111)
(op :field (byte 7 9))
(width :field (byte 1 8) :type 'width)
(reg/mem :fields (list (byte 2 22) (byte 3 16))
:type 'reg/mem)
(reg :field (byte 3 19) :type 'reg)
;; optional fields
(imm))
;;; Same as reg/mem, but with a prefix of #b00001111
(disassem:define-instruction-format (ext-reg/mem 24
:default-printer '(:name :tab reg/mem))
(prefix :field (byte 8 0) :value #b00001111)
(op :fields (list (byte 7 9) (byte 3 19)))
(width :field (byte 1 8) :type 'width)
(reg/mem :fields (list (byte 2 22) (byte 3 16))
:type 'sized-reg/mem)
;; optional fields
(imm))
;;; ----------------------------------------------------------------
;;; this section added by jrd, for fp instructions.
;;;
;;; regular fp inst to/from registers/memory
;;;
(disassem:define-instruction-format (floating-point 16
:default-printer `(:name :tab reg/mem))
(prefix :field (byte 5 3) :value #b11011)
(op :fields (list (byte 3 0) (byte 3 11)))
(reg/mem :fields (list (byte 2 14) (byte 3 8)) :type 'reg/mem)
)
;;;
;;; fp insn to/from fp reg
;;;
(disassem:define-instruction-format (floating-point-fp 16
:default-printer `(:name :tab fp-reg))
(prefix :field (byte 5 3) :value #b11011)
(suffix :field (byte 2 14) :value #b11)
(op :fields (list (byte 3 0) (byte 3 11)))
(fp-reg :field (byte 3 8) :type 'fp-reg)
)
;;;
;;; fp insn to/from fp reg, with the reversed source/destination flag.
;;;
(disassem:define-instruction-format
(floating-point-fp-d 16
:default-printer `(:name :tab ,(swap-if 'd "ST0" ", " 'fp-reg)))
(prefix :field (byte 5 3) :value #b11011)
(suffix :field (byte 2 14) :value #b11)
(op :fields (list (byte 2 0) (byte 3 11)))
(d :field (byte 1 2))
(fp-reg :field (byte 3 8) :type 'fp-reg)
)
;;; pfw
;;; fp no operand isns
;;;
(disassem:define-instruction-format (floating-point-no 16
:default-printer '(:name))
(prefix :field (byte 8 0) :value #b11011001)
(suffix :field (byte 3 13) :value #b111)
(op :field (byte 5 8)))
(disassem:define-instruction-format (floating-point-5 16
:default-printer '(:name))
(prefix :field (byte 8 0) :value #b11011011)
(suffix :field (byte 3 13) :value #b111)
(op :field (byte 5 8)))
(disassem:define-instruction-format (floating-point-st 16
:default-printer '(:name))
(prefix :field (byte 8 0) :value #b11011111)
(suffix :field (byte 3 13) :value #b111)
(op :field (byte 5 8)))
;;; ----------------------------------------------------------------
;;;; General Data Transfer
(eval-when (eval compile load)
(defun toggle-word-width (chunk inst stream dstate)
(declare (ignore chunk inst stream))
(let ((ww (or (disassem:dstate-get-prop dstate 'word-width)
*default-operand-size*)))
(setf (disassem:dstate-get-prop dstate 'word-width)
(ecase ww
(:word :dword)
(:dword :word))))))
;;; This isn't a really an instruction, but it's easier to deal with it this
;;; way. We assume that it's actually used.
(define-instruction toggle-data-size (segment)
(:printer byte ((op operand-size-prefix-byte))
nil ; don't actually print it
:control #'toggle-word-width))
(define-instruction mov (segment dst src)
;; immediate to register
(:printer reg ((op #b1011) (imm nil :type 'imm-data))
'(:name :tab reg ", " imm))
;; absolute mem to/from accumulator
(:printer simple-dir ((op #b101000) (imm nil :type 'imm-addr))
`(:name :tab ,(swap-if 'dir 'accum ", " '("[" imm "]"))))
;; register to/from register/memory
(:printer reg-reg/mem-dir ((op #b100010)))
;; immediate to register/memory
(:printer reg/mem-imm ((op '(#b1100011 #b000))))
(:emitter
(let ((size (matching-operand-size dst src)))
(maybe-emit-operand-size-prefix segment size)
(cond ((register-p dst)
(cond ((integerp src)
(emit-byte-with-reg segment
(if (eq size :byte)
#b10110
#b10111)
(reg-tn-encoding dst))
(emit-sized-immediate segment size src))
((and (fixup-p src) (accumulator-p dst))
(emit-byte segment
(if (eq size :byte)
#b10100000
#b10100001))
(emit-absolute-fixup segment src))
(t
(emit-byte segment
(if (eq size :byte)
#b10001010
#b10001011))
(emit-ea segment src (reg-tn-encoding dst) t))))
((and (fixup-p dst) (accumulator-p src))
(emit-byte segment (if (eq size :byte) #b10100010 #b10100011))
(emit-absolute-fixup segment dst))
((integerp src)
(emit-byte segment (if (eq size :byte) #b11000110 #b11000111))
(emit-ea segment dst #b000)
(emit-sized-immediate segment size src))
((register-p src)
(emit-byte segment (if (eq size :byte) #b10001000 #b10001001))
(emit-ea segment dst (reg-tn-encoding src)))
((fixup-p src)
(assert (eq size :dword))
(emit-byte segment #b11000111)
(emit-ea segment dst #b000)
(emit-absolute-fixup segment src))
(t
(error "Bogus arguments to MOV: ~S ~S" dst src))))))
(defun emit-move-with-extension (segment dst src opcode)
(assert (register-p dst))
(let ((dst-size (operand-size dst))
(src-size (operand-size src)))
(ecase dst-size
(:word
(assert (eq src-size :byte))
(maybe-emit-operand-size-prefix segment :word)
(emit-byte segment #b00001111)
(emit-byte segment opcode)
(emit-ea segment src (reg-tn-encoding dst)))
(:dword
(ecase src-size
(:byte
(maybe-emit-operand-size-prefix segment :dword)
(emit-byte segment #b00001111)
(emit-byte segment opcode)
(emit-ea segment src (reg-tn-encoding dst)))
(:word
(emit-byte segment #b00001111)
(emit-byte segment (logior opcode 1))
(emit-ea segment src (reg-tn-encoding dst))))))))
(define-instruction movsx (segment dst src)
(:printer ext-reg-reg/mem ((op #b1011111) (reg nil :type 'word-reg)))
(:emitter
(emit-move-with-extension segment dst src #b10111110)))
(define-instruction movzx (segment dst src)
(:printer ext-reg-reg/mem ((op #b1011011) (reg nil :type 'word-reg)))
(:emitter
(emit-move-with-extension segment dst src #b10110110)))
(define-instruction push (segment src)
;; Register.
(:printer reg-no-width ((op #b01010)))
;; Register/Memory.
(:printer reg/mem ((op '(#b1111111 #b110)) (width 1)))
;; Immediate.
(:printer byte ((op #b01101010) (imm nil :type 'signed-imm-byte))
'(:name :tab imm))
(:printer byte ((op #b01101000) (imm nil :type 'imm-word))
'(:name :tab imm))
;; ### Segment registers?
(:emitter
(cond ((integerp src)
(cond ((<= -128 src 127)
(emit-byte segment #b01101010)
(emit-byte segment src))
(t
(emit-byte segment #b01101000)
(emit-dword segment src))))
((fixup-p src)
;; Interpret the fixup as an immediate dword to push
(emit-byte segment #b01101000)
(emit-absolute-fixup segment src))
(t
(let ((size (operand-size src)))
(assert (not (eq size :byte)))
(maybe-emit-operand-size-prefix segment size)
(cond ((register-p src)
(emit-byte-with-reg segment #b01010 (reg-tn-encoding src)))
(t
(emit-byte segment #b11111111)
(emit-ea segment src #b110 t))))))))
(define-instruction pusha (segment)
(:printer byte ((op #b01100000)))
(:emitter
(emit-byte segment #b01100000)))
(define-instruction pop (segment dst)
(:printer reg-no-width ((op #b01011)))
(:printer reg/mem ((op '(#b1000111 #b000)) (width 1)))
(:emitter
(let ((size (operand-size dst)))
(assert (not (eq size :byte)))
(maybe-emit-operand-size-prefix segment size)
(cond ((register-p dst)
(emit-byte-with-reg segment #b01011 (reg-tn-encoding dst)))
(t
(emit-byte segment #b10001111)
(emit-ea segment dst #b000))))))
(define-instruction popa (segment)
(:printer byte ((op #b01100001)))
(:emitter
(emit-byte segment #b01100001)))
(define-instruction xchg (segment operand1 operand2)
;; Register with accumulator.
(:printer reg-no-width ((op #b10010)) '(:name :tab accum ", " reg))
;; Register/Memory with Register.
(:printer reg-reg/mem ((op #b1000011)))
(:emitter
(let ((size (matching-operand-size operand1 operand2)))
(maybe-emit-operand-size-prefix segment size)
(labels ((xchg-acc-with-something (acc something)
(if (and (not (eq size :byte)) (register-p something))
(emit-byte-with-reg segment
#b10010
(reg-tn-encoding something))
(xchg-reg-with-something acc something)))
(xchg-reg-with-something (reg something)
(emit-byte segment (if (eq size :byte) #b10000110 #b10000111))
(emit-ea segment something (reg-tn-encoding reg))))
(cond ((accumulator-p operand1)
(xchg-acc-with-something operand1 operand2))
((accumulator-p operand2)
(xchg-acc-with-something operand2 operand1))
((register-p operand1)
(xchg-reg-with-something operand1 operand2))
((register-p operand2)
(xchg-reg-with-something operand2 operand1))
(t
(error "Bogus args to XCHG: ~S ~S" operand1 operand2)))))))
(define-instruction lea (segment dst src)
(:printer reg-reg/mem ((op #b1000110) (width 1)))
(:emitter
(assert (dword-reg-p dst))
(emit-byte segment #b10001101)
(emit-ea segment src (reg-tn-encoding dst))))
;;;; Flag control instructions.
;;; CLC -- Clear Carry Flag.
;;;
(define-instruction clc (segment)
(:printer byte ((op #b11111000)))
(:emitter
(emit-byte segment #b11111000)))
;;; CLD -- Clear Direction Flag.
;;;
(define-instruction cld (segment)
(:printer byte ((op #b11111100)))
(:emitter
(emit-byte segment #b11111100)))
;;; CLI -- Clear Iterrupt Enable Flag.
;;;
(define-instruction cli (segment)
(:printer byte ((op #b11111010)))
(:emitter
(emit-byte segment #b11111010)))
;;; CMC -- Complement Carry Flag.
;;;
(define-instruction cmc (segment)
(:printer byte ((op #b11110101)))
(:emitter
(emit-byte segment #b11110101)))
;;; LAHF -- Load AH into flags.
;;;
(define-instruction lahf (segment)
(:printer byte ((op #b10011111)))
(:emitter
(emit-byte segment #b10011111)))
;;; POPF -- Pop flags.
;;;
(define-instruction popf (segment)
(:printer byte ((op #b10011101)))
(:emitter
(emit-byte segment #b10011101)))
;;; PUSHF -- push flags.
;;;
(define-instruction pushf (segment)
(:printer byte ((op #b10011100)))
(:emitter
(emit-byte segment #b10011100)))
;;; SAHF -- Store AH into flags.
;;;
(define-instruction sahf (segment)
(:printer byte ((op #b10011110)))
(:emitter
(emit-byte segment #b10011110)))
;;; STC -- Set Carry Flag.
;;;
(define-instruction stc (segment)
(:printer byte ((op #b11111001)))
(:emitter
(emit-byte segment #b11111001)))
;;; STD -- Set Direction Flag.
;;;
(define-instruction std (segment)
(:printer byte ((op #b11111101)))
(:emitter
(emit-byte segment #b11111101)))
;;; STI -- Set Interrupt Enable Flag.
;;;
(define-instruction sti (segment)
(:printer byte ((op #b11111011)))
(:emitter
(emit-byte segment #b11111011)))
;;;; Arithmetic
(defun emit-random-arith-inst (name segment dst src opcode
&optional allow-constants)
(let ((size (matching-operand-size dst src)))
(maybe-emit-operand-size-prefix segment size)
(cond
((integerp src)
(cond ((and (not (eq size :byte)) (<= -128 src 127))
(emit-byte segment #b10000011)
(emit-ea segment dst opcode)
(emit-byte segment src))
((accumulator-p dst)
(emit-byte segment
(dpb opcode
(byte 3 3)
(if (eq size :byte)
#b00000100
#b00000101)))
(emit-sized-immediate segment size src))
(t
(emit-byte segment (if (eq size :byte) #b10000000 #b10000001))
(emit-ea segment dst opcode)
(emit-sized-immediate segment size src))))
((register-p src)
(emit-byte segment
(dpb opcode
(byte 3 3)
(if (eq size :byte) #b00000000 #b00000001)))
(emit-ea segment dst (reg-tn-encoding src) allow-constants))
((register-p dst)
(emit-byte segment
(dpb opcode
(byte 3 3)
(if (eq size :byte) #b00000010 #b00000011)))
(emit-ea segment src (reg-tn-encoding dst) allow-constants))
(t
(error "Bogus operands to ~A" name)))))
(eval-when (compile eval)
(defun arith-inst-printer-list (subop)
`((accum-imm ((op ,(dpb subop (byte 3 2) #b0000010))))
(reg/mem-imm ((op (#b1000000 ,subop))))
(reg/mem-imm ((op (#b1000001 ,subop))
(imm nil :type signed-imm-byte)))
(reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
)
(define-instruction add (segment dst src)
(:printer-list
(arith-inst-printer-list #b000))
(:emitter
(emit-random-arith-inst "ADD" segment dst src #b000)))
(define-instruction adc (segment dst src)
(:printer-list
(arith-inst-printer-list #b010))
(:emitter
(emit-random-arith-inst "ADC" segment dst src #b010)))
(define-instruction sub (segment dst src)
(:printer-list
(arith-inst-printer-list #b101))
(:emitter
(emit-random-arith-inst "SUB" segment dst src #b101)))
(define-instruction sbb (segment dst src)
(:printer-list
(arith-inst-printer-list #b011))
(:emitter
(emit-random-arith-inst "SBB" segment dst src #b011)))
(define-instruction cmp (segment dst src)
(:printer-list
(arith-inst-printer-list #b111))
(:emitter
(emit-random-arith-inst "CMP" segment dst src #b111 t)))
(define-instruction inc (segment dst)
;; Register.
(:printer reg-no-width ((op #b01000)))
;; Register/Memory
(:printer reg/mem ((op '(#b1111111 #b000))))
(:emitter
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(cond ((and (not (eq size :byte)) (register-p dst))
(emit-byte-with-reg segment #b01000 (reg-tn-encoding dst)))
(t
(emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
(emit-ea segment dst #b000))))))
(define-instruction dec (segment dst)
;; Register.
(:printer reg-no-width ((op #b01001)))
;; Register/Memory
(:printer reg/mem ((op '(#b1111111 #b001))))
(:emitter
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(cond ((and (not (eq size :byte)) (register-p dst))
(emit-byte-with-reg segment #b01001 (reg-tn-encoding dst)))
(t
(emit-byte segment (if (eq size :byte) #b11111110 #b11111111))
(emit-ea segment dst #b001))))))
(define-instruction neg (segment dst)
(:printer reg/mem ((op '(#b1111011 #b011))))
(:emitter
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment dst #b011))))
(define-instruction aaa (segment)
(:printer byte ((op #b00110111)))
(:emitter
(emit-byte segment #b00110111)))
(define-instruction aas (segment)
(:printer byte ((op #b00111111)))
(:emitter
(emit-byte segment #b00111111)))
(define-instruction daa (segment)
(:printer byte ((op #b00100111)))
(:emitter
(emit-byte segment #b00100111)))
(define-instruction das (segment)
(:printer byte ((op #b00101111)))
(:emitter
(emit-byte segment #b00101111)))
(define-instruction mul (segment dst src)
(:printer accum-reg/mem ((op '(#b1111011 #b100))))
(:emitter
(let ((size (matching-operand-size dst src)))
(assert (accumulator-p dst))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment src #b100))))
(define-instruction imul (segment dst &optional src1 src2)
(:printer accum-reg/mem ((op '(#b1111011 #b101))))
(:printer ext-reg-reg/mem ((op #b1010111)))
(:printer reg-reg/mem ((op #b0110100) (width 1) (imm nil :type 'imm-word))
'(:name :tab reg ", " reg/mem ", " imm))
(:printer reg-reg/mem ((op #b0110101) (width 1)
(imm nil :type 'signed-imm-byte))
'(:name :tab reg ", " reg/mem ", " imm))
(:emitter
(flet ((r/m-with-immed-to-reg (reg r/m immed)
(let* ((size (matching-operand-size reg r/m))
(sx (and (not (eq size :byte)) (<= -128 immed 127))))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if sx #b01101011 #b01101001))
(emit-ea segment r/m (reg-tn-encoding reg))
(if sx
(emit-byte segment immed)
(emit-sized-immediate segment size immed)))))
(cond (src2
(r/m-with-immed-to-reg dst src1 src2))
(src1
(if (integerp src1)
(r/m-with-immed-to-reg dst dst src1)
(let ((size (matching-operand-size dst src1)))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b00001111)
(emit-byte segment #b10101111)
(emit-ea segment src1 (reg-tn-encoding dst)))))
(t
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment dst #b101)))))))
(define-instruction div (segment dst src)
(:printer accum-reg/mem ((op '(#b1111011 #b110))))
(:emitter
(let ((size (matching-operand-size dst src)))
(assert (accumulator-p dst))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment src #b110))))
(define-instruction idiv (segment dst src)
(:printer accum-reg/mem ((op '(#b1111011 #b111))))
(:emitter
(let ((size (matching-operand-size dst src)))
(assert (accumulator-p dst))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment src #b111))))
(define-instruction aad (segment)
(:printer two-bytes ((op '(#b11010101 #b00001010))))
(:emitter
(emit-byte segment #b11010101)
(emit-byte segment #b00001010)))
(define-instruction aam (segment)
(:printer two-bytes ((op '(#b11010100 #b00001010))))
(:emitter
(emit-byte segment #b11010100)
(emit-byte segment #b00001010)))
;;; CBW -- Convert Byte to Word. AX <- sign_xtnd(AL)
;;;
(define-instruction cbw (segment)
(:emitter
(maybe-emit-operand-size-prefix segment :word)
(emit-byte segment #b10011000)))
;;; CWDE -- Convert Word To Double Word Extened. EAX <- sign_xtnd(AX)
;;;
(define-instruction cwde (segment)
(:emitter
(maybe-emit-operand-size-prefix segment :dword)
(emit-byte segment #b10011000)))
;;; CWD -- Convert Word to Double Word. DX:AX <- sign_xtnd(AX)
;;;
(define-instruction cwd (segment)
(:emitter
(maybe-emit-operand-size-prefix segment :word)
(emit-byte segment #b10011001)))
;;; CDQ -- Convert Double Word to Quad Word. EDX:EAX <- sign_xtnd(EAX)
;;;
(define-instruction cdq (segment)
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(:emitter
(maybe-emit-operand-size-prefix segment :dword)
(emit-byte segment #b10011001)))
;;;; Logic.
(defun emit-shift-inst (segment dst amount opcode)
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(multiple-value-bind
(major-opcode immed)
(case amount
(:cl (values #b11010010 nil))
(1 (values #b11010000 nil))
(t (values #b11000000 t)))
(emit-byte segment
(if (eq size :byte) major-opcode (logior major-opcode 1)))
(emit-ea segment dst opcode)
(when immed
(emit-byte segment amount)))))
(eval-when (compile eval)
(defun shift-inst-printer-list (subop)
`((reg/mem ((op (#b1101000 ,subop)))
(:name :tab reg/mem ", 1"))
(reg/mem ((op (#b1101001 ,subop)))
(:name :tab reg/mem ", " 'cl))
(reg/mem-imm ((op (#b1100000 ,subop))
(imm nil :type signed-imm-byte))))))
(define-instruction rol (segment dst amount)
(:printer-list
(shift-inst-printer-list #b000))
(:emitter
(emit-shift-inst segment dst amount #b000)))
(define-instruction ror (segment dst amount)
(:printer-list
(shift-inst-printer-list #b001))
(:emitter
(emit-shift-inst segment dst amount #b001)))
(define-instruction rcl (segment dst amount)
(:printer-list
(shift-inst-printer-list #b010))
(:emitter
(emit-shift-inst segment dst amount #b010)))
(define-instruction rcr (segment dst amount)
(:printer-list
(shift-inst-printer-list #b011))
(:emitter
(emit-shift-inst segment dst amount #b011)))
(define-instruction shl (segment dst amount)
(:printer-list
(shift-inst-printer-list #b100))
(:emitter
(emit-shift-inst segment dst amount #b100)))
(define-instruction shr (segment dst amount)
(:printer-list
(shift-inst-printer-list #b101))
(:emitter
(emit-shift-inst segment dst amount #b101)))
(define-instruction sar (segment dst amount)
(:printer-list
(shift-inst-printer-list #b111))
(:emitter
(emit-shift-inst segment dst amount #b111)))
(defun emit-double-shift (segment opcode dst src amt)
(let ((size (matching-operand-size dst src)))
(when (eq size :byte)
(error "Double shifts can only be used with words."))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b00001111)
(emit-byte segment (dpb opcode (byte 1 3)
(if (eq amt :cl) #b10100101 #b10100100)))
#+nil
(emit-ea segment dst src)
(emit-ea segment dst (reg-tn-encoding src)) ; pw tries this
(unless (eq amt :cl)
(emit-byte segment amt))))
(eval-when (compile eval)
(defun double-shift-inst-printer-list (op)
`(#+nil
(ext-reg-reg/mem-imm ((op ,(logior op #b100))
(imm nil :type signed-imm-byte)))
(ext-reg-reg/mem ((op ,(logior op #b101)))
(:name :tab reg/mem ", " 'cl)))))
(define-instruction shld (segment dst src amt)
(:declare (type (or (member :cl) (mod 32)) amt))
(:printer-list (double-shift-inst-printer-list #b10100000))
(:emitter
(emit-double-shift segment #b0 dst src amt)))
(define-instruction shrd (segment dst src amt)
(:declare (type (or (member :cl) (mod 32)) amt))
(:printer-list (double-shift-inst-printer-list #b10101000))
(:emitter
(emit-double-shift segment #b1 dst src amt)))
(define-instruction and (segment dst src)
(:printer-list
(arith-inst-printer-list #b100))
(:emitter
(emit-random-arith-inst "AND" segment dst src #b100)))
(define-instruction test (segment this that)
(:printer accum-imm ((op #b1010100)))
(:printer reg/mem-imm ((op '(#b1111011 #b000))))
(:printer reg-reg/mem ((op #b1000010)))
(:emitter
(let ((size (matching-operand-size this that)))
(maybe-emit-operand-size-prefix segment size)
(flet ((test-immed-and-something (immed something)
(cond ((accumulator-p something)
(emit-byte segment
(if (eq size :byte) #b10101000 #b10101001))
(emit-sized-immediate segment size immed))
(t
(emit-byte segment
(if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment something #b000)
(emit-sized-immediate segment size immed))))
(test-reg-and-something (reg something)
(emit-byte segment (if (eq size :byte) #b10000100 #b10000101))
(emit-ea segment something (reg-tn-encoding reg))))
(cond ((integerp that)
(test-immed-and-something that this))
((integerp this)
(test-immed-and-something this that))
((register-p this)
(test-reg-and-something this that))
((register-p that)
(test-reg-and-something that this))
(t
(error "Bogus operans for TEST: ~S and ~S" this that)))))))
(define-instruction or (segment dst src)
(:printer-list
(arith-inst-printer-list #b001))
(:emitter
(emit-random-arith-inst "OR" segment dst src #b001)))
(define-instruction xor (segment dst src)
(:printer-list
(arith-inst-printer-list #b110))
(:emitter
(emit-random-arith-inst "XOR" segment dst src #b110)))
(define-instruction not (segment dst)
(:printer reg/mem ((op '(#b1111011 #b010))))
(:emitter
(let ((size (operand-size dst)))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b11110110 #b11110111))
(emit-ea segment dst #b010))))
;;;; String manipulation.
(disassem:define-instruction-format (string-op 8
:include 'simple
:default-printer '(:name width)))
(define-instruction cmps (segment size)
(:printer string-op ((op #b1010011)))
(:emitter
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b10100110 #b10100111))))
(define-instruction ins (segment acc)
(:printer string-op ((op #b0110110)))
(:emitter
(let ((size (operand-size acc)))
(assert (accumulator-p acc))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b01101100 #b01101101)))))
(define-instruction lods (segment acc)
(:printer string-op ((op #b1010110)))
(:emitter
(let ((size (operand-size acc)))
(assert (accumulator-p acc))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b10101100 #b10101101)))))
(define-instruction movs (segment size)
(:printer string-op ((op #b1010010)))
(:emitter
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b10100100 #b10100101))))
(define-instruction outs (segment acc)
(:printer string-op ((op #b0110111)))
(:emitter
(let ((size (operand-size acc)))
(assert (accumulator-p acc))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b01101110 #b01101111)))))
(define-instruction scas (segment acc)
(:printer string-op ((op #b1010111)))
(:emitter
(let ((size (operand-size acc)))
(assert (accumulator-p acc))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b10101110 #b10101111)))))
(define-instruction stos (segment acc)
(:printer string-op ((op #b1010101)))
(:emitter
(let ((size (operand-size acc)))
(assert (accumulator-p acc))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment (if (eq size :byte) #b10101010 #b10101011)))))
(define-instruction xlat (segment)
(:printer byte ((op #b11010111)))
(:emitter
(emit-byte segment #b11010111)))
(define-instruction rep (segment)
(:emitter
(emit-byte segment #b11110010)))
(define-instruction repe (segment)
(:printer byte ((op #b11110011)))
(:emitter
(emit-byte segment #b11110011)))
(define-instruction repne (segment)
(:printer byte ((op #b11110010)))
(:emitter
(emit-byte segment #b11110010)))
;;;; Bit Manipulation
(define-instruction bsf (segment dst src)
(:emitter
(let ((size (matching-operand-size dst src)))
(when (eq size :byte)
(error "Can't scan bytes: ~S" src))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b00001111)
(emit-byte segment #b10111100)
(emit-ea segment src (reg-tn-encoding dst)))))
(define-instruction bsr (segment dst src)
(:emitter
(let ((size (matching-operand-size dst src)))
(when (eq size :byte)
(error "Can't scan bytes: ~S" src))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b00001111)
(emit-byte segment #b10111101)
(emit-ea segment src (reg-tn-encoding dst)))))
(defun emit-bit-test-and-mumble (segment src index opcode)
(let ((size (operand-size src)))
(when (eq size :byte)
(error "Can't scan bytes: ~S" src))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b00001111)
(cond ((integerp index)
(emit-byte segment #b10111010)
(emit-ea segment src opcode)
(emit-byte segment index))
(t
(emit-byte segment (dpb opcode (byte 3 3) #b10000011))
(emit-ea segment src (reg-tn-encoding index))))))
(define-instruction bt (segment src index)
(:emitter
(emit-bit-test-and-mumble segment src index #b100)))
(define-instruction btc (segment src index)
(:emitter
(emit-bit-test-and-mumble segment src index #b111)))
(define-instruction btr (segment src index)
(:emitter
(emit-bit-test-and-mumble segment src index #b110)))
(define-instruction bts (segment src index)
(:emitter
(emit-bit-test-and-mumble segment src index #b101)))
;;;; Control transfer.
(eval-when (compile load eval)
(defparameter condition-name-vec
(let ((vec (make-array 16 :initial-element nil)))
(dolist (cond conditions)
(when (null (aref vec (cdr cond)))
(setf (aref vec (cdr cond)) (car cond))))
vec)))
(disassem:define-argument-type condition-code
:printer condition-name-vec)
(disassem:define-argument-type displacement
:sign-extend t
:use-label #'offset-next)
(disassem:define-instruction-format (short-cond-jump 16)
(op :field (byte 4 4))
(cc :field (byte 4 0) :type 'condition-code)
(label :field (byte 8 8) :type 'displacement))
(disassem:define-instruction-format (short-jump 16
:default-printer '(:name :tab label))
(const :field (byte 4 4) :value #b1110)
(op :field (byte 4 0))
(label :field (byte 8 8) :type 'displacement))
(disassem:define-instruction-format (near-cond-jump 16)
(op :fields (list (byte 8 0) (byte 4 12)) :value '(#b00001111 #b1000))
(cc :field (byte 4 8) :type 'condition-code)
;; The disassembler currently doesn't let you have an instruction > 32 bits
;; long, so we fake it by using a prefilter to read the offset.
(label :type 'displacement :prefilter #'read-signed-imm-dword))
(disassem:define-instruction-format (near-jump 8
:default-printer '(:name :tab label))
(op :field (byte 8 0))
;; The disassembler currently doesn't let you have an instruction > 32 bits
;; long, so we fake it by using a prefilter to read the address.
(label :type 'displacement :prefilter #'read-signed-imm-dword))
(define-instruction call (segment where)
(:printer near-jump ((op #b11101000)))
(:printer reg/mem ((op '(#b1111111 #b010)) (width 1)))
(:emitter
(typecase where
(label
(emit-byte segment #b11101000)
(emit-back-patch segment 4
#'(lambda (segment posn)
(emit-dword segment
(- (label-position where)
(+ posn 4))))))
(fixup
(emit-byte segment #b11101000)
(emit-relative-fixup segment where))
(t
(emit-byte segment #b11111111)
(emit-ea segment where #b010)))))
(defun emit-byte-displacement-backpatch (segment target)
(emit-back-patch segment 1
#'(lambda (segment posn)
(let ((disp (- (label-position target) (1+ posn))))
(assert (<= -128 disp 127))
(emit-byte segment disp)))))
(define-instruction jmp (segment cond &optional where)
;; conditional jumps
(:printer short-cond-jump ((op #b0111)) '('j cc :tab label))
(:printer near-cond-jump () '('j cc :tab label))
;; unconditional jumps
(:printer short-jump ((op #b1011)))
(:printer near-jump ((op #b11101001)) )
(:printer reg/mem ((op '(#b1111111 #b100)) (width 1)))
(:emitter
(cond (where
(emit-chooser
segment 6 2
#'(lambda (segment posn delta-if-after)
(let ((disp (- (label-position where posn delta-if-after)
(+ posn 2))))
(when (<= -128 disp 127)
(emit-byte segment
(dpb (conditional-opcode cond)
(byte 4 0)
#b01110000))
(emit-byte-displacement-backpatch segment where)
t)))
#'(lambda (segment posn)
(let ((disp (- (label-position where) (+ posn 6))))
(emit-byte segment #b00001111)
(emit-byte segment
(dpb (conditional-opcode cond)
(byte 4 0)
#b10000000))
(emit-dword segment disp)))))
((label-p (setq where cond))
(emit-chooser
segment 5 0
#'(lambda (segment posn delta-if-after)
(let ((disp (- (label-position where posn delta-if-after)
(+ posn 2))))
(when (<= -128 disp 127)
(emit-byte segment #b11101011)
(emit-byte-displacement-backpatch segment where)
t)))
#'(lambda (segment posn)
(let ((disp (- (label-position where) (+ posn 5))))
(emit-byte segment #b11101001)
(emit-dword segment disp))
)))
((fixup-p where)
(emit-byte segment #b11101001)
(emit-relative-fixup segment where))
(t
(unless (or (ea-p where) (tn-p where))
(error "Don't know what to do with ~A" where))
(emit-byte segment #b11111111)
(emit-ea segment where #b100)))))
(define-instruction jmp-short (segment label)
(:emitter
(emit-byte segment #b11101011)
(emit-byte-displacement-backpatch segment label)))
(define-instruction ret (segment &optional stack-delta)
(:printer byte ((op #b11000011)))
(:printer byte ((op #b11000010) (imm nil :type 'imm-word-16))
'(:name :tab imm))
(:emitter
(cond (stack-delta
(emit-byte segment #b11000010)
(emit-word segment stack-delta))
(t
(emit-byte segment #b11000011)))))
(define-instruction jecxz (segment target)
(:printer short-jump ((op #b0011)))
(:emitter
(emit-byte segment #b11100011)
(emit-byte-displacement-backpatch segment target)))
(define-instruction loop (segment target)
(:printer short-jump ((op #b0010)))
(:emitter
(emit-byte segment #b11100010) ; pfw this was 11100011, or jecxz!!!!
(emit-byte-displacement-backpatch segment target)))
(define-instruction loopz (segment target)
(:printer short-jump ((op #b0001)))
(:emitter
(emit-byte segment #b11100001)
(emit-byte-displacement-backpatch segment target)))
(define-instruction loopnz (segment target)
(:printer short-jump ((op #b0000)))
(:emitter
(emit-byte segment #b11100000)
(emit-byte-displacement-backpatch segment target)))
;;;; Conditional byte set.
(disassem:define-instruction-format (cond-set 24
:default-printer '('set cc :tab reg/mem))
(prefix :field (byte 8 0) :value #b00001111)
(op :field (byte 4 12) :value #b1001)
(cc :field (byte 4 8) :type 'condition-code)
(reg/mem :fields (list (byte 2 22) (byte 3 16))
:type 'byte-reg/mem)
(reg :field (byte 3 19) :value #b000))
(define-instruction set (segment dst cond)
(:printer cond-set ())
(:emitter
(emit-byte segment #b00001111)
(emit-byte segment (dpb (conditional-opcode cond) (byte 4 0) #b10010000))
(emit-ea segment dst #b000)))
;;;; Enter/Leave
(disassem:define-instruction-format
(enter-format
24
:default-printer '(:name :tab disp (:unless (:constant 0) ", " level)))
(op :field (byte 8 0))
(disp :field (byte 16 8))
(level :field (byte 8 16)))
(define-instruction enter (segment disp &optional (level 0))
(:declare (type (unsigned-byte 16) disp)
(type (unsigned-byte 8) level))
(:emitter
(emit-byte segment #b11001000)
(emit-word segment disp)
(emit-byte segment level)))
(define-instruction leave (segment)
(:printer byte ((op #b11001001)))
(:emitter
(emit-byte segment #b11001001)))
;;;; Interrupt instructions.
(disassem:define-instruction-format
(break 16 :default-printer '(:name :tab code))
(op :field (byte 8 0) :value #b11001100)
(code :field (byte 8 8)))
(define-emitter emit-break-inst 16
(byte 8 0) (byte 8 8))
(defun snarf-error-junk (sap offset &optional length-only)
(let* ((length (system:sap-ref-8 sap offset))
(vector (make-array length :element-type '(unsigned-byte 8))))
(declare (type system:system-area-pointer sap)
(type (unsigned-byte 8) length)
(type (simple-array (unsigned-byte 8) (*)) vector))
(cond (length-only
(values 0 (1+ length) nil nil))
(t
(kernel:copy-from-system-area sap (* byte-bits (1+ offset))
vector (* word-bits
vector-data-offset)
(* length byte-bits))
(collect ((sc-offsets)
(lengths))
(lengths 1) ; the length byte
(let* ((index 0)
(error-number (c::read-var-integer vector index)))
(lengths index)
(loop
(when (>= index length)
(return))
(let ((old-index index))
(sc-offsets (c::read-var-integer vector index))
(lengths (- index old-index))))
(values error-number
(1+ length)
(sc-offsets)
(lengths))))))))
(defmacro break-cases (breaknum &body cases)
(let ((bn-temp (gensym)))
(collect ((clauses))
(dolist (case cases)
(clauses `((= ,bn-temp ,(car case)) ,@(cdr case))))
`(let ((,bn-temp ,breaknum))
(cond ,@(clauses))))))
(defun break-control (chunk inst stream dstate)
(declare (ignore inst))
(flet ((nt (x) (if stream (disassem:note x dstate))))
(case (break-code chunk dstate)
(#.vm:error-trap
(nt "Error trap")
(disassem:handle-break-args #'snarf-error-junk stream dstate))
(#.vm:cerror-trap
(nt "Cerror trap")
(disassem:handle-break-args #'snarf-error-junk stream dstate))
(#.vm:breakpoint-trap
(nt "Breakpoint trap"))
(#.vm:pending-interrupt-trap
(nt "Pending interrupt trap"))
(#.vm:halt-trap
(nt "Halt trap"))
(#.vm:function-end-breakpoint-trap
(nt "Function end breakpoint trap"))
)))
(define-instruction break (segment code)
(:declare (type (unsigned-byte 8) code))
(:printer break ((op #b11001100))
'(:name :tab code)
:control #'break-control )
(:emitter
(emit-break-inst segment #b11001100 code)))
(define-instruction int (segment number)
(:declare (type (unsigned-byte 8) number))
(:emitter
(etypecase number
((member 3)
(emit-byte segment #b11001100))
((unsigned-byte 8)
(emit-byte segment #b11001101)
(emit-byte segment number)))))
(define-instruction into (segment)
(:printer byte ((op #b11001110)))
(:emitter
(emit-byte segment #b11001110)))
(define-instruction bound (segment reg bounds)
(:emitter
(let ((size (matching-operand-size reg bounds)))
(when (eq size :byte)
(error "Can't bounds-test bytes: ~S" reg))
(maybe-emit-operand-size-prefix segment size)
(emit-byte segment #b01100010)
(emit-ea segment bounds (reg-tn-encoding reg)))))
(define-instruction iret (segment)
(:printer byte ((op #b11001111)))
(:emitter
(emit-byte segment #b11001111)))
;;;; Processor control
(define-instruction hlt (segment)
(:printer byte ((op #b11110100)))
(:emitter
(emit-byte segment #b11110100)))
(define-instruction nop (segment)
(:printer byte ((op #b10010000)))
(:emitter
(emit-byte segment #b10010000)))
(define-instruction wait (segment)
(:printer byte ((op #b10011011)))
(:emitter
(emit-byte segment #b10011011)))
(define-instruction lock (segment)
(:printer byte ((op #b11110000)))
(:emitter
(emit-byte segment #b11110000)))
;;;; Random hackery
(define-instruction byte (segment byte)
(:emitter
(emit-byte segment byte)))
(define-instruction word (segment word)
(:emitter
(emit-word segment word)))
(define-instruction dword (segment dword)
(:emitter
(emit-dword segment dword)))
(defun emit-header-data (segment type)
(emit-back-patch
segment 4
#'(lambda (segment posn)
(emit-dword segment
(logior type
(ash (+ posn (component-header-length))
(- type-bits word-shift)))))))
(define-instruction function-header-word (segment)
(:emitter
(emit-header-data segment function-header-type)))
(define-instruction lra-header-word (segment)
(:emitter
(emit-header-data segment return-pc-header-type)))
;;; ----------------------------------------------------------------
;;; added by jrd. fp instructions
;;;
;;;
;;; we treat the single-precision and double-precision variants
;;; as separate instructions
;;;
;;;
;;; load single to st(0)
;;;
(define-instruction fld (segment source)
(:printer floating-point ((op '(#b001 #b000))))
(:emitter
(emit-byte segment #b11011001)
(emit-fp-op segment source #b000)))
;;;
;;; load double to st(0)
;;;
(define-instruction fldd (segment source)
(:printer floating-point ((op '(#b101 #b000))))
(:printer floating-point-fp ((op '(#b001 #b000))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011001)
(emit-byte segment #b11011101))
(emit-fp-op segment source #b000)))
;;;
;;; store single from st(0)
;;;
(define-instruction fst (segment dest)
(:printer floating-point ((op '(#b001 #b010))))
(:emitter
(cond ((fp-reg-tn-p dest)
(emit-byte segment #b11011101)
(emit-fp-op segment dest #b010))
(t
(emit-byte segment #b11011001)
(emit-fp-op segment dest #b010)))))
;;;
;;; store double from st(0)
;;;
(define-instruction fstd (segment dest)
(:printer floating-point ((op '(#b101 #b010))))
(:printer floating-point-fp ((op '(#b101 #b010))))
(:emitter
(cond ((fp-reg-tn-p dest)
(emit-byte segment #b11011101)
(emit-fp-op segment dest #b010))
(t
(emit-byte segment #b11011101)
(emit-fp-op segment dest #b010)))))
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;;; Arithmetic ops are all done with at least one operand at top of
;;; stack. The other operand is is another register or a 32/64 bit
;;; memory loc.
;;; dtc: I've tried to follow the Intel ASM386 conventions, but note
;;; that these conflict with the Gdb conventions for binops. To reduce
;;; the confusion I've added comments showing the mathamatical
;;; operation and the two syntaxes. By the ASM386 convention the
;;; instruction syntax is:
;;;
;;; Fop Source
;;; or Fop Destination, Source
;;;
;;; If only one operand is given then it is the source and the
;;; destination is ST(0). There are reversed forms of the fsub and
;;; fdiv instructions inducated by an 'R' suffix.
;;;
;;; The mathematical operation for the non-reverse form is always:
;;; destination = destination op source
;;;
;;; For the reversed form it is:
;;; destination = source op destination
;;;
;;; The instructions below only accept one operand at present which is
;;; usually the source. I've hack in extra instructions to implement
;;; the fops with a ST(i) destination, these have a -sti suffix and
;;; the operand is the destination with the source being ST(0).
;;;
;;; Add single
;;; st(0) = st(0) + memory or st(i)
;;;
(define-instruction fadd (segment source)
(:printer floating-point ((op '(#b000 #b000))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b000)))
;;;
;;; Add double
;;; st(0) = st(0) + memory or st(i)
;;;
(define-instruction faddd (segment source)
(:printer floating-point ((op '(#b100 #b000))))
(:printer floating-point-fp ((op '(#b000 #b000))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b000)))
;;;
;;; Add double destination st(i)
;;; st(i) = st(0) + st(i)
;;;
(define-instruction fadd-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b000))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b000)))
;;; With pop
(define-instruction faddp-sti (segment destination)
(:printer floating-point-fp ((op '(#b110 #b000))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011110)
(emit-fp-op segment destination #b000)))
;;;
;;; Subtract single
;;; st(0) = st(0) - memory or st(i)
;;;
(define-instruction fsub (segment source)
(:printer floating-point ((op '(#b000 #b100))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b100)))
;;;
;;; Subtract single, reverse
;;; st(0) = memory or st(i) - st(0)
;;;
(define-instruction fsubr (segment source)
(:printer floating-point ((op '(#b000 #b101))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b101)))
;;;
;;; Subtract double
;;; st(0) = st(0) - memory or st(i)
;;;
(define-instruction fsubd (segment source)
(:printer floating-point ((op '(#b100 #b100))))
(:printer floating-point-fp ((op '(#b000 #b100))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b100)))
;;;
;;; Subtract double, reverse
;;; st(0) = memory or st(i) - st(0)
;;;
(define-instruction fsubrd (segment source)
(:printer floating-point ((op '(#b100 #b101))))
(:printer floating-point-fp ((op '(#b000 #b101))))
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(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b101)))
;;;
;;; Subtract double, destination st(i)
;;; st(i) = st(i) - st(0)
;;;
;;; ASM386 syntax: FSUB ST(i), ST
;;; Gdb syntax: fsubr %st,%st(i)
;;;
(define-instruction fsub-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b101))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b101)))
;;; With a pop
(define-instruction fsubp-sti (segment destination)
(:printer floating-point-fp ((op '(#b110 #b101))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011110)
(emit-fp-op segment destination #b101)))
;;;
;;; Subtract double, reverse, destination st(i)
;;; st(i) = st(0) - st(i)
;;;
;;; ASM386 syntax: FSUBR ST(i), ST
;;; Gdb syntax: fsub %st,%st(i)
;;;
(define-instruction fsubr-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b100))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b100)))
;;; With a pop
(define-instruction fsubrp-sti (segment destination)
(:printer floating-point-fp ((op '(#b110 #b100))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011110)
(emit-fp-op segment destination #b100)))
;;;
;;; Multiply single
;;; st(0) = st(0) * memory or st(i)
;;;
(define-instruction fmul (segment source)
(:printer floating-point ((op '(#b000 #b001))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b001)))
;;;
;;; Multiply double
;;; st(0) = st(0) * memory or st(i)
;;;
(define-instruction fmuld (segment source)
(:printer floating-point ((op '(#b100 #b001))))
(:printer floating-point-fp ((op '(#b000 #b001))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b001)))
;;;
;;; Multiply double, destination st(i)
;;; st(i) = st(i) * st(0)
;;;
(define-instruction fmul-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b001))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b001)))
;;;
;;; Divide single
;;; st(0) = st(0) / memory or st(i)
;;;
(define-instruction fdiv (segment source)
(:printer floating-point ((op '(#b000 #b110))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b110)))
;;;
;;; Divide single, reverse
;;; st(0) = memory or st(i) / st(0)
;;;
(define-instruction fdivr (segment source)
(:printer floating-point ((op '(#b000 #b111))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment source #b111)))
;;;
;;; Divide double
;;; st(0) = st(0) / memory or st(i)
;;;
(define-instruction fdivd (segment source)
(:printer floating-point ((op '(#b100 #b110))))
(:printer floating-point-fp ((op '(#b000 #b110))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b110)))
;;;
;;; Divide double, reverse
;;; st(0) = memory or st(i) / st(0)
;;;
(define-instruction fdivrd (segment source)
(:printer floating-point ((op '(#b100 #b111))))
(:printer floating-point-fp ((op '(#b000 #b111))))
(:emitter
(if (fp-reg-tn-p source)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment source #b111)))
;;;
;;; Divide double, destination st(i)
;;; st(i) = st(i) / st(0)
;;;
;;; ASM386 syntax: FDIV ST(i), ST
;;; Gdb syntax: fdivr %st,%st(i)
;;;
(define-instruction fdiv-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b111))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b111)))
;;;
;;; Divide double, reverse, destination st(i)
;;; st(i) = st(0) / st(i)
;;;
;;; ASM386 syntax: FDIVR ST(i), ST
;;; Gdb syntax: fdiv %st,%st(i)
;;;
(define-instruction fdivr-sti (segment destination)
(:printer floating-point-fp ((op '(#b100 #b110))))
(:emitter
(assert (fp-reg-tn-p destination))
(emit-byte segment #b11011100)
(emit-fp-op segment destination #b110)))
;;;
;;; exchange fr0 with fr(n). no double variant
;;;
(define-instruction fxch (segment source)
(:printer floating-point-fp ((op '(#b001 #b001))))
(:emitter
(unless (and (tn-p source)
(eq (sb-name (sc-sb (tn-sc source))) 'float-registers))
(lisp:break))
(emit-byte segment #b11011001)
(emit-fp-op segment source #b001)))
;;;
;;;
;;; push 32-bit integer to st0
;;;
(define-instruction fild (segment source)
(:printer floating-point ((op '(#b011 #b000))))
(:emitter
(emit-byte segment #b11011011)
(emit-fp-op segment source #b000)))
;;;
;;; push 64-bit integer to st0
;;;
(define-instruction fildl (segment source)
(:printer floating-point ((op '(#b111 #b101))))
(:emitter
(emit-byte segment #b11011111)
(emit-fp-op segment source #b101)))
;;;
;;; store 32-bit integer
;;;
(define-instruction fist (segment dest)
(:printer floating-point ((op '(#b011 #b010))))
(:emitter
(emit-byte segment #b11011011)
(emit-fp-op segment dest #b010)))
;;; Store and pop 32-bit integer
(define-instruction fistp (segment dest)
(:printer floating-point ((op '(#b011 #b011))))
(:emitter
(emit-byte segment #b11011011)
(emit-fp-op segment dest #b011)))
;;;
;;; Store and pop 64-bit integer
;;;
(define-instruction fistpl (segment dest)
(:printer floating-point ((op '(#b111 #b111))))
(:emitter
(emit-byte segment #b11011111)
(emit-fp-op segment dest #b111)))
;;;
;;; store single from st(0) and pop
;;;
(define-instruction fstp (segment dest)
(:printer floating-point ((op '(#b001 #b011))))
(:printer floating-point-fp ((op '(#b101 #b011))))
(:emitter
(emit-byte segment #b11011101)
(emit-fp-op segment dest #b011))
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(emit-byte segment #b11011001)
(emit-fp-op segment dest #b011)))))
;;;
;;; decrement stack-top pointer
;;;
(define-instruction fdecstp (segment)
(:printer floating-point-no ((op #b10110)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110110)))
;;;
;;; increment stack-top pointer
;;;
(define-instruction fincstp (segment)
(:printer floating-point-no ((op #b10111)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110111)))
;;;
;;; free fp register
;;;
(define-instruction ffree (segment dest)
(:printer floating-point-fp ((op '(#b101 #b000))))
(:emitter
(emit-byte segment #b11011101)
(emit-fp-op segment dest #b000)))
(define-instruction fabs (segment)
(:printer floating-point-no ((op #b00001)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11100001)))
(define-instruction fchs (segment)
(:printer floating-point-no ((op #b00000)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11100000)))
(define-instruction frndint(segment)
(:printer floating-point-no ((op #b11100)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111100)))
;;;
;;; Initialize NPX
;;;
(define-instruction fninit(segment)
(:printer floating-point-5 ((op #b00011)))
(:emitter
(emit-byte segment #b11011011)
(emit-byte segment #b11100011)))
;;;
;;; Store Status Word to AX
;;;
(define-instruction fnstsw(segment)
(:printer floating-point-st ((op #b00000)))
(:emitter
(emit-byte segment #b11011111)
(emit-byte segment #b11100000)))
;;;
;;; Load Control Word
;;;
;;; src must be a memory location
(define-instruction fldcw(segment src)
(:printer floating-point ((op '(#b001 #b101))))
(:emitter
(emit-byte segment #b11011001)
(emit-fp-op segment src #b101)))
;;;
;;; Store Control Word
;;;
(define-instruction fnstcw(segment dst)
(:printer floating-point ((op '(#b001 #b111))))
(:emitter
(emit-byte segment #b11011001)
(emit-fp-op segment dst #b111)))
;;;
;;; Store FP Environment
;;;
(define-instruction fstenv(segment dst)
(:printer floating-point ((op '(#b001 #b110))))
(:emitter
(emit-byte segment #b11011001)
(emit-fp-op segment dst #b110)))
;;;
;;; Retore FP Environment
;;;
(define-instruction fldenv(segment src)
(:printer floating-point ((op '(#b001 #b100))))
(:emitter
(emit-byte segment #b11011001)
(emit-fp-op segment src #b100)))
;;;
;;; Save FP State
;;;
(define-instruction fsave(segment dst)
(:printer floating-point ((op '(#b101 #b110))))
(:emitter
(emit-byte segment #b11011101)
(emit-fp-op segment dst #b110)))
;;;
;;; Restore FP State
;;;
(define-instruction frstor(segment src)
(:printer floating-point ((op '(#b101 #b100))))
(:emitter
(emit-byte segment #b11011101)
(emit-fp-op segment src #b100)))
;;;
;;; Clear exceptions
;;;
(define-instruction fnclex(segment)
(:printer floating-point-5 ((op #b00010)))
(:emitter
(emit-byte segment #b11011011)
(emit-byte segment #b11100010)))
;;;
;;; Comparison
;;;
(define-instruction fcom(segment src)
(:printer floating-point ((op '(#b000 #b010))))
(:emitter
(emit-byte segment #b11011000)
(emit-fp-op segment src #b010)))
(define-instruction fcomd(segment src)
(:printer floating-point ((op '(#b100 #b010))))
(:printer floating-point-fp ((op '(#b000 #b010))))
(:emitter
(if (fp-reg-tn-p src)
(emit-byte segment #b11011000)
(emit-byte segment #b11011100))
(emit-fp-op segment src #b010)))
;;;
;;; Unordered comparison
;;;
(define-instruction fucom(segment src)
;; XX Printer conflicts with frstor
;; (:printer floating-point ((op '(#b101 #b100))))
(:emitter
(assert (fp-reg-tn-p src))
(emit-byte segment #b11011101)
(emit-fp-op segment src #b100)))
(define-instruction ftst (segment)
(:printer floating-point-no ((op #b00100)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11100100)))
;;;
;;; 80387 Specials
;;;
;;;
(define-instruction fsqrt(segment)
(:printer floating-point-no ((op #b11010)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111010)))
(define-instruction fscale(segment)
(:printer floating-point-no ((op #b11101)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111101)))
(define-instruction fxtract(segment)
(:printer floating-point-no ((op #b10100)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110100)))
(define-instruction fsin(segment)
(:printer floating-point-no ((op #b11110)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111110)))
(define-instruction fcos(segment)
(:printer floating-point-no ((op #b11111)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111111)))
(define-instruction fprem1(segment)
(:printer floating-point-no ((op #b10101)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110101)))
(define-instruction fprem(segment)
(:printer floating-point-no ((op #b11000)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111000)))
(define-instruction fxam (segment)
(:printer floating-point-no ((op #b00101)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11100101)))
;;; These do push/pop to stack and need special handling
;;; in any VOPs that use them. See the book.
;; st0 <- st1*log2(st0)
(define-instruction fyl2x(segment) ; POPS STACK
(:printer floating-point-no ((op #b10001)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110001)))
(define-instruction fyl2xp1(segment)
(:printer floating-point-no ((op #b11001)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11111001)))
(define-instruction f2xm1(segment)
(:printer floating-point-no ((op #b10000)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110000)))
(define-instruction fptan(segment) ; st(0) <- 1; st(1) <- tan
(:printer floating-point-no ((op #b10010)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110010)))
(define-instruction fpatan(segment) ; POPS STACK
(:printer floating-point-no ((op #b10011)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11110011)))
;;; load constant
(define-instruction fldz(segment)
(:printer floating-point-no ((op #b01110)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101110)))
(define-instruction fld1(segment)
(:printer floating-point-no ((op #b01000)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101000)))
(define-instruction fldpi(segment)
(:printer floating-point-no ((op #b01011)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101011)))
(define-instruction fldl2t(segment)
(:printer floating-point-no ((op #b01001)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101001)))
(define-instruction fldl2e(segment)
(:printer floating-point-no ((op #b01010)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101010)))
(define-instruction fldlg2(segment)
(:printer floating-point-no ((op #b01100)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101100)))
(define-instruction fldln2(segment)
(:printer floating-point-no ((op #b01101)))
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101101)))