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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 1.34 2010/03/01 13:55:09 rtoy 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, 1998.
;;;
(in-package :x86)
(use-package :new-assem)
(def-assembler-params
:scheduler-p nil)
(disassem:set-disassem-params :instruction-alignment 8
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;;;; 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))
;; ea only has space for three bits of register number: regs r8
;; and up are selected by a REX prefix byte which caller is responsible
;; for having emitted where necessary already
(ecase (sb-name (sc-sb (tn-sc tn)))
(registers
(let ((offset (mod (tn-offset tn) 16)))
(logior (ash (logand offset 1) 2)
(ash offset -1))))
(float-registers
(mod (tn-offset tn) 8))))
(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 valid-displacement-p (x)
(typep x '(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 (x86-location-print-name (ea-base ea)) stream)
(when (ea-index ea)
(write-string "+" stream)))
(when (ea-index ea)
(write-string (x86-location-print-name (ea-index ea)) stream))
(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 #+sse2 float-registers)
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(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)
(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 compatible-operand-size (dst src)
(let ((dst-size (operand-size dst))
(src-size (operand-size src)))
(if dst-size
dst-size
(if src-size
src-size
(error "Can't tell the size of either ~S or ~S."
dst src)))))
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(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 #\[ stream)
(let ((firstp t))
(macrolet ((pel ((var val) &body body)
;; Print an element of the address, maybe with
;; a leading separator.
`(let ((,var ,val))
(when ,var
(unless firstp
(write-char #\+ stream))
,@body
(setq firstp nil)))))
(pel (base-reg (first value))
(print-addr-reg base-reg stream dstate))
(pel (index-reg (third value))
(print-addr-reg index-reg stream dstate)
(let ((index-scale (fourth value)))
(when (and index-scale (not (= index-scale 1)))
(write-char #\* stream)
(princ index-scale stream))))
(let ((offset (second value)))
(when (and offset (or firstp (not (zerop offset))))
(unless (or firstp (minusp offset))
(write-char #\+ stream))
(if firstp
(let ((unsigned-offset (if (minusp offset)
(+ #x100000000 offset)
offset)))
(disassem:princ16 unsigned-offset stream)
(or (nth-value 1
(disassem::note-code-constant-absolute unsigned-offset
(disassem:maybe-note-assembler-routine unsigned-offset
stream
dstate)
(let ((offs (- offset disassem::nil-addr)))
(when (typep offs 'disassem::offset)
(or (disassem::maybe-note-nil-indexed-symbol-slot-ref offs
dstate)
(disassem::maybe-note-static-function offs dstate))))))
(princ offset stream))))))
(write-char #\] stream))
(defun print-imm-data (value stream dstate)
(let ((offset (- value disassem::nil-addr)))
(if (zerop offset)
(format stream "#x~X" value)
(format stream "~A" value))
(when (typep offset 'disassem::offset)
(or (disassem::maybe-note-nil-indexed-object offset dstate)
(let ((unsigned-offset (if (and (numberp value) (minusp value))
(+ value #x100000000)
value)))
(disassem::maybe-note-assembler-routine unsigned-offset stream dstate))
(nth-value 1
(disassem::note-code-constant-absolute offset
dstate))))))
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(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-signed-suffix 32 dstate)
nil))
(#b01
(disassem:read-signed-suffix 8 dstate))
(#b10
(disassem:read-signed-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-signed-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-signed-suffix 32 dstate))))))
(defun prefilter-reg-r (value dstate)
(declare (type reg value)
(type disassem:disassem-state dstate))
value)
;;; 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)
(+ (disassem:dstate-next-addr dstate) value))
(defun read-address (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-suffix (width-bits *default-address-size*) dstate))
(defun width-bits (width)
(ecase width
(:byte 8)
(:word 16)
(:dword 32)
(:float 32)
(:double 64)))
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;;; Return true if THING is an XMM register TN.
(defun xmm-register-p (thing)
(and (tn-p thing)
(eq (sb-name (sc-sb (tn-sc thing))) 'float-registers)))
(defun print-xmmreg (value stream dstate)
(declare (type xmmreg value)
(type stream stream)
(ignore dstate))
(format stream "XMM~d" value))
(defun print-xmmreg/mem (value stream dstate)
(declare (type (or list xmmreg) value)
(type stream stream)
(type disassem:disassem-state dstate))
(if (typep value 'xmmreg)
(print-xmmreg value stream dstate)
(print-mem-access value stream nil dstate)))
;; Same as print-xmmreg/mem, but prints an explicit size indicator for
;; memory references.
(defun print-sized-xmmreg/mem (value stream dstate)
(declare (type (or list xmmreg) value)
(type stream stream)
(type disassem:disassem-state dstate))
(if (typep value 'xmmreg)
(print-xmmreg value stream dstate)
(print-mem-access value stream nil dstate)))
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); 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))
:printer #'print-imm-data
)
(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 #'(lambda (value dstate)
(declare (ignore value)) ; always nil anyway
(disassem:read-signed-suffix 32 dstate)))
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(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))
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(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 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))
;;; 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-3 16
:default-printer '(:name))
(prefix :field (byte 5 3) :value #b11011)
(suffix :field (byte 2 14) :value #b11)
(op :fields (list (byte 3 0) (byte 6 8))))
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(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 (compatible-operand-size dst src)))
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(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)