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• Reading-memory-as-strings-or-bytes

Read-bytes-from-memory

Read nbytes bytes from memory

Signature

(read-bytes-from-memory ptr nbytes x86 acc) → (mv * * x86)

Returns a list of bytes (byte at the smallest address is the first byte of the list).

Definitions and Theorems

Function: read-bytes-from-memory

(defun read-bytes-from-memory (ptr nbytes x86 acc)
 (declare (xargs :stobjs (x86)))
 (declare (type (signed-byte 49) ptr)
          (type (unsigned-byte 48) nbytes))
 (declare (xargs :split-types t
                 :guard (and (integerp nbytes)
                             (<= 0 nbytes)
                             (integerp ptr)
                             (<= (- *2^47*) ptr)
                             (< (+ ptr nbytes) *2^47*)
                             (nat-listp acc))))
 (let ((__function__ 'read-bytes-from-memory))
   (declare (ignorable __function__))
   (if
    (mbt (and (integerp nbytes)
              (integerp ptr)
              (<= (- *2^47*) ptr)
              (< (+ ptr nbytes) *2^47*)))
    (if (zp nbytes)
        (mv nil (reverse acc) x86)
      (b* (((mv flg (the (unsigned-byte 8) byte)
                x86)
            (rml08 ptr :r x86))
           ((when flg) (mv flg nil x86)))
        (read-bytes-from-memory (the (signed-byte 49) (1+ ptr))
                                (the (unsigned-byte 48) (1- nbytes))
                                x86 (cons byte acc))))
    (mv t (reverse acc) x86))))

Theorem: byte-listp-mv-nth-1-read-bytes-from-memory

(defthm byte-listp-mv-nth-1-read-bytes-from-memory
 (implies
  (forced-and (x86p x86) (byte-listp acc))
  (byte-listp (mv-nth 1
                      (read-bytes-from-memory ptr nbytes x86 acc))))
 :rule-classes :type-prescription)

Theorem: x86p-mv-nth-2-read-bytes-from-memory

(defthm x86p-mv-nth-2-read-bytes-from-memory
  (implies
       (x86p x86)
       (x86p (mv-nth 2
                     (read-bytes-from-memory ptr nbytes x86 acc)))))