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• Writing-strings-or-bytes-to-memory

Write-bytes-to-memory

The byte at the smallest address should be the last byte of bytes.

Signature

(write-bytes-to-memory ptr bytes x86) → (mv flg x86)

Returns

x86 — Type (x86p x86), given (x86p x86).

Definitions and Theorems

Function: write-bytes-to-memory

(defun write-bytes-to-memory (ptr bytes x86)
  (declare (xargs :stobjs (x86)))
  (declare (type (signed-byte 49) ptr))
  (declare (xargs :guard (and (integerp ptr)
                              (<= (- *2^47*) ptr)
                              (byte-listp bytes)
                              (< (+ -1 (len bytes) ptr) *2^47*))
                  :split-types t))
  (let ((__function__ 'write-bytes-to-memory))
    (declare (ignorable __function__))
    (if (mbt (and (integerp ptr)
                  (<= (- *2^47*) ptr)
                  (byte-listp bytes)
                  (< (+ -1 (len bytes) ptr) *2^47*)))
        (if (endp bytes)
            (mv nil x86)
          (b* (((mv flg x86)
                (wml08 ptr (the (unsigned-byte 8) (car bytes))
                       x86))
               ((when flg) (mv flg x86)))
            (write-bytes-to-memory (the (signed-byte 49) (1+ ptr))
                                   (cdr bytes)
                                   x86)))
      (mv t x86))))

Theorem: x86p-of-write-bytes-to-memory.x86

(defthm x86p-of-write-bytes-to-memory.x86
  (implies (x86p x86)
           (b* (((mv ?flg ?x86)
                 (write-bytes-to-memory ptr bytes x86)))
             (x86p x86)))
  :rule-classes :rewrite)

Theorem: rewrite-write-bytes-to-memory-to-wb

(defthm rewrite-write-bytes-to-memory-to-wb
  (implies
       (and (app-view x86)
            (canonical-address-p (+ -1 (len bytes) addr))
            (canonical-address-p addr)
            (byte-listp bytes))
       (and (equal (mv-nth 0
                           (write-bytes-to-memory addr bytes x86))
                   (mv-nth 0
                           (wb (len bytes)
                               addr :w (combine-bytes bytes)
                               x86)))
            (equal (mv-nth 1
                           (write-bytes-to-memory addr bytes x86))
                   (mv-nth 1
                           (wb (len bytes)
                               addr :w (combine-bytes bytes)
                               x86))))))