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Two-byte-opcodes

X86-one-byte-nop

Signature
(x86-one-byte-nop proc-mode start-rip temp-rip prefixes rex-byte opcode modr/m sib x86) → x86
Returns: x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: x86-one-byte-nop

(defun x86-one-byte-nop
       (proc-mode start-rip temp-rip
                  prefixes rex-byte opcode modr/m sib x86)
  (declare (xargs :stobjs (x86)))
  (declare (type (integer 0 4) proc-mode)
           (type (signed-byte 48) start-rip)
           (type (signed-byte 48) temp-rip)
           (type (unsigned-byte 52) prefixes)
           (type (unsigned-byte 8) rex-byte)
           (type (unsigned-byte 8) opcode)
           (type (unsigned-byte 8) modr/m)
           (type (unsigned-byte 8) sib))
  (declare (ignorable proc-mode start-rip temp-rip
                      prefixes rex-byte opcode modr/m sib))
  (declare (xargs :guard (and (prefixes-p prefixes)
                              (modr/m-p modr/m)
                              (sib-p sib)
                              (rip-guard-okp proc-mode temp-rip))))
  (let ((__function__ 'x86-one-byte-nop))
    (declare (ignorable __function__))
    (b* ((?ctx 'x86-one-byte-nop)
         (?r/m (the (unsigned-byte 3)
                    (modr/m->r/m modr/m)))
         (?mod (the (unsigned-byte 2)
                    (modr/m->mod modr/m)))
         (?reg (the (unsigned-byte 3)
                    (modr/m->reg modr/m))))
      (b* ((x86 (write-*ip proc-mode temp-rip x86)))
        x86))))

Theorem: x86p-of-x86-one-byte-nop

(defthm x86p-of-x86-one-byte-nop
 (implies
   (x86p x86)
   (b* ((x86 (x86-one-byte-nop proc-mode start-rip temp-rip prefixes
                               rex-byte opcode modr/m sib x86)))
     (x86p x86)))
 :rule-classes :rewrite)