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X86-swapgs

Signature

(x86-swapgs 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-swapgs

(defun x86-swapgs
       (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-swapgs))
    (declare (ignorable __function__))
    (b* ((?ctx 'x86-swapgs)
         (?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* (((when (app-view x86))
            (!!ms-fresh :swapgs-unimplemented))
           (tmp (msri *ia32_gs_base-idx* x86))
           (x86 (!msri *ia32_gs_base-idx*
                       (msri *ia32_kernel_gs_base-idx* x86)
                       x86))
           (x86 (!msri *ia32_kernel_gs_base-idx* tmp x86))
           (x86 (write-*ip proc-mode temp-rip x86)))
        x86))))

Theorem: x86p-of-x86-swapgs

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