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One-byte-opcodes

X86-rdtsc

Signature
(x86-rdtsc 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-rdtsc

(defun x86-rdtsc (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-rdtsc))
    (declare (ignorable __function__))
    (b* ((?ctx 'x86-rdtsc))
      (b* ((time-stamp-counter (time-stamp-counter x86))
           (x86 (wr32 *eax* (loghead 32 time-stamp-counter)
                      x86))
           (x86 (wr32 *edx*
                      (loghead 32 (logtail 32 time-stamp-counter))
                      x86)))
        (write-*ip proc-mode temp-rip x86)))))

Theorem: x86p-of-x86-rdtsc

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