(accum :type 'accum)
(imm))
+(sb!disassem:define-instruction-format (two-bytes 16
+ :default-printer '(:name))
+ (op :fields (list (byte 8 0) (byte 8 8))))
+
;;; A one-byte instruction with a #x66 prefix, used to indicate an
;;; operand size of :word.
(sb!disassem:define-instruction-format (x66-byte 16
:default-printer '(:name :tab code))
(op :field (byte 8 0))
(code :field (byte 8 8)))
+
+;;; Two byte instruction with an immediate byte argument.
+;;;
+(sb!disassem:define-instruction-format (word-imm 24
+ :default-printer '(:name :tab code))
+ (op :field (byte 16 0))
+ (code :field (byte 8 16)))
+
\f
;;;; primitive emitters
(emit-byte segment #b10001101)
(emit-ea segment src (reg-tn-encoding dst))))
-(define-instruction cmpxchg (segment dst src)
+(define-instruction cmpxchg (segment dst src &optional prefix)
;; Register/Memory with Register.
(:printer ext-reg-reg/mem ((op #b1011000)) '(:name :tab reg/mem ", " reg))
(:emitter
(aver (register-p src))
+ (emit-prefix segment prefix)
(let ((size (matching-operand-size src dst)))
(maybe-emit-operand-size-prefix segment size)
(maybe-emit-rex-for-ea segment dst src)
(emit-ea segment dst (reg-tn-encoding src)))))
\f
-
-(define-instruction fs-segment-prefix (segment)
- (:emitter
- (emit-byte segment #x64)))
-
;;;; flag control instructions
;;; CLC -- Clear Carry Flag.
(rex-reg-reg/mem-dir ((op ,(dpb subop (byte 3 1) #b000000))))))
)
-(define-instruction add (segment dst src)
+(define-instruction add (segment dst src &optional prefix)
(:printer-list (arith-inst-printer-list #b000))
- (:emitter (emit-random-arith-inst "ADD" segment dst src #b000)))
+ (:emitter
+ (emit-prefix segment prefix)
+ (emit-random-arith-inst "ADD" segment dst src #b000)))
(define-instruction adc (segment dst src)
(:printer-list (arith-inst-printer-list #b010))
(maybe-emit-rex-prefix segment :qword nil nil nil)
(emit-byte segment #b10011001)))
-(define-instruction xadd (segment dst src)
+(define-instruction xadd (segment dst src &optional prefix)
;; Register/Memory with Register.
(:printer ext-reg-reg/mem ((op #b1100000)) '(:name :tab reg/mem ", " reg))
(:emitter
(aver (register-p src))
+ (emit-prefix segment prefix)
(let ((size (matching-operand-size src dst)))
(maybe-emit-operand-size-prefix segment size)
(maybe-emit-rex-for-ea segment dst src)
(- (label-position where)
(+ posn 4))))))
(fixup
- (emit-byte segment #b11101000)
- (emit-relative-fixup segment where))
+ ;; There is no CALL rel64...
+ (error "Cannot CALL a fixup: ~S" where))
(t
(maybe-emit-rex-for-ea segment where nil :operand-size :do-not-set)
(emit-byte segment #b11111111)
(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))
(t
(emit-byte segment #b11000011)))))
-(define-instruction jecxz (segment target)
+(define-instruction jrcxz (segment target)
(:printer short-jump ((op #b0011)))
(:emitter
(emit-byte segment #b11100011)
;; 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 (byte-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))
- (:printer byte-imm ((op #b11001100)) '(:name :tab code)
- :control #'break-control)
- (:emitter
- (emit-byte segment #b11001100)
+ #!-darwin (:printer byte-imm ((op #b11001100)) '(:name :tab code)
+ :control #'break-control)
+ #!+darwin (:printer word-imm ((op #b0000101100001111)) '(:name :tab code)
+ :control #'break-control)
+ (:emitter
+ #!-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)
(emit-byte segment code)))
(define-instruction int (segment number)
(:emitter
(emit-byte segment #b10011011)))
+(defun emit-prefix (segment name)
+ (declare (ignorable segment))
+ (ecase name
+ ((nil))
+ (:lock
+ #!+sb-thread
+ (emit-byte segment #xf0))))
+
+;;; FIXME: It would be better to make the disassembler understand the prefix as part
+;;; of the instructions...
(define-instruction lock (segment)
(:printer byte ((op #b11110000)))
(:emitter
- (emit-byte segment #b11110000)))
+ (bug "LOCK prefix used as a standalone instruction")))
\f
;;;; miscellaneous hackery
(emit-byte segment #x0f)
(emit-byte segment #xae)
(emit-ea segment dst 3)))
+
+;;;; 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)))