(accum :type 'accum)
(imm))
+(sb!disassem:define-instruction-format (two-bytes 16
+ :default-printer '(:name))
+ (op :fields (list (byte 8 0) (byte 8 8))))
+
;;; Same as simple, but with direction bit
(sb!disassem:define-instruction-format (simple-dir 8 :include 'simple)
(op :field (byte 6 2))
(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)) n-word-bytes))))
+ (let ((disp (frame-byte-offset (tn-offset thing))))
(cond ((<= -128 disp 127)
(emit-mod-reg-r/m-byte segment #b01 reg #b101)
(emit-byte segment disp))
(emit-word segment value))
(:dword
(emit-dword segment value))))
+
+(defun toggle-word-width (chunk inst stream dstate)
+ (declare (ignore chunk inst stream))
+ (let ((word-width (or (sb!disassem:dstate-get-prop dstate 'word-width)
+ +default-operand-size+)))
+ (setf (sb!disassem:dstate-get-prop dstate 'word-width)
+ (ecase word-width
+ (:word :dword)
+ (:dword :word)))))
+
+;;; This is a "prefix" instruction, which means that it modifies the
+;;; following instruction in some way without having an actual
+;;; mnemonic of its own.
+(define-instruction operand-size-prefix (segment)
+ (:printer byte ((op +operand-size-prefix-byte+))
+ nil ; don't actually print it
+ :control #'toggle-word-width))
\f
;;;; general data transfer
\f
(define-instruction fs-segment-prefix (segment)
+ (:printer byte ((op #b01100100)))
(:emitter
(emit-byte segment #x64)))
+(define-instruction gs-segment-prefix (segment)
+ (:printer byte ((op #b01100101)))
+ (:emitter
+ (emit-byte segment #x65)))
+
;;;; flag control instructions
;;; CLC -- Clear Carry Flag.
(t
(error "bogus operands for TEST: ~S and ~S" this that)))))))
+;;; Emit the most compact form of the test immediate instruction,
+;;; using an 8 bit test when the immediate is only 8 bits and the
+;;; value is one of the four low registers (eax, ebx, ecx, edx) or the
+;;; control stack.
+(defun emit-optimized-test-inst (x y)
+ (typecase y
+ ((unsigned-byte 7)
+ (let ((offset (tn-offset x)))
+ (cond ((and (sc-is x any-reg descriptor-reg)
+ (or (= offset eax-offset) (= offset ebx-offset)
+ (= offset ecx-offset) (= offset edx-offset)))
+ (inst test (make-random-tn :kind :normal
+ :sc (sc-or-lose 'byte-reg)
+ :offset offset)
+ y))
+ ((sc-is x control-stack)
+ (inst test (make-ea :byte :base ebp-tn
+ :disp (- (* (1+ offset) n-word-bytes)))
+ y))
+ (t
+ (inst test x y)))))
+ (t
+ (inst test x y))))
+
(define-instruction or (segment dst src)
(:printer-list
(arith-inst-printer-list #b001))
;; Lisp (with (DESCRIBE 'BYTE-IMM-CODE)) than to definitively deduce
;; from first principles whether it's defined in some way that genesis
;; can't grok.
- (case #-darwin (byte-imm-code chunk dstate)
- #+darwin (word-imm-code chunk dstate)
+ (case #!-darwin (byte-imm-code chunk dstate)
+ #!+darwin (word-imm-code chunk dstate)
(#.error-trap
(nt "error trap")
(sb!disassem:handle-break-args #'snarf-error-junk stream dstate))
(define-instruction break (segment code)
(:declare (type (unsigned-byte 8) code))
- #-darwin (:printer byte-imm ((op #b11001100)) '(:name :tab code)
+ #!-darwin (:printer byte-imm ((op #b11001100)) '(:name :tab code)
:control #'break-control)
- #+darwin (:printer word-imm ((op #b0000101100001111)) '(:name :tab code)
+ #!+darwin (:printer word-imm ((op #b0000101100001111)) '(:name :tab code)
:control #'break-control)
(:emitter
- #-darwin (emit-byte segment #b11001100)
+ #!-darwin (emit-byte segment #b11001100)
;; On darwin, trap handling via SIGTRAP is unreliable, therefore we
;; throw a sigill with 0x0b0f instead and check for this in the
;; SIGILL handler and pass it on to the sigtrap handler if
;; appropriate
- #+darwin (emit-word segment #b0000101100001111)
+ #!+darwin (emit-word segment #b0000101100001111)
(emit-byte segment code)))
(define-instruction int (segment number)
(:emitter
(emit-byte segment #b11011001)
(emit-byte segment #b11101101)))
+
+;;;; Miscellany
+
+(define-instruction cpuid (segment)
+ (:printer two-bytes ((op '(#b00001111 #b10100010))))
+ (:emitter
+ (emit-byte segment #b00001111)
+ (emit-byte segment #b10100010)))
+
+(define-instruction rdtsc (segment)
+ (:printer two-bytes ((op '(#b00001111 #b00110001))))
+ (:emitter
+ (emit-byte segment #b00001111)
+ (emit-byte segment #b00110001)))