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Two-byte-opcodes

X86-two-byte-jcc

Signature
(x86-two-byte-jcc 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-two-byte-jcc

(defun x86-two-byte-jcc
       (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-two-byte-jcc))
  (declare (ignorable __function__))
  (b* ((?ctx 'x86-two-byte-jcc))
   (b*
    (((the (integer 0 4) offset-size)
      (select-operand-size proc-mode
                           nil rex-byte nil prefixes nil t t x86))
     (badlength?
          (check-instruction-length start-rip temp-rip offset-size))
     ((when badlength?)
      (!!fault-fresh :gp 0
                     :instruction-length badlength?))
     (branch-cond (jcc/cmovcc/setcc-spec opcode x86)))
    (if branch-cond
        (b* (((mv flg offset x86)
              (rime-size proc-mode
                         offset-size temp-rip 1 :x nil x86))
             ((when flg)
              (!!ms-fresh :rime-size-error flg))
             ((mv flg next-rip)
              (add-to-*ip proc-mode
                          temp-rip (+ offset-size offset)
                          x86))
             ((when flg)
              (!!ms-fresh :rip-increment-error flg))
             (x86 (write-*ip proc-mode next-rip x86)))
          x86)
      (b* (((mv flg next-rip)
            (add-to-*ip proc-mode temp-rip offset-size x86))
           ((when flg)
            (!!ms-fresh :rip-increment-error flg))
           (x86 (write-*ip proc-mode next-rip x86)))
        x86))))))

Theorem: x86p-of-x86-two-byte-jcc

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