Added assigment3

a3_decrypter/grupp_01.lab1_underlag.s

+# ----------------------------------------------------------
+#  Group 1's "underlag" for Lab 1
+#  Pseudo-instructions may be used for Lab 1.
+# ----------------------------------------------------------
+ 
+ 
+ 
+# Group 1's Codeword Generator Subroutine (pseudocode)
+#  (remember:  "seed" is a global variable, UNSIGNED INTEGER;
+#              you may implement local variables in registers or on the stack;
+#              result returned in v0; preserve all except t regs)
+#
+# FUNCTION codgen(): UNSIGNED INTEGER;
+#  LOCAL SIGNED INTEGER   n;
+#  LOCAL UNSIGNED INTEGER x, y;
+#  BEGIN
+#    n := [count the number of 0's in word "seed"];
+#    x := [rotate "seed" left by 30 bits];
+#    y := [shift "seed" right-ARITHMETIC by 6 bits];
+#    seed := x XOR y XOR n;
+#   RETURN( seed XOR 0x464b713e );
+#  END;
+# 
+# hint:  if "seed" is initialized to 0x3e944b9f,
+#        the first five calls will generate these values:
+#        0x891432f9, 0x4aa1dccc, 0xc54270fa, 0x9885155f, 0xce83d1b8, ...
+# your code is to be written farther down (see comment below).
+ 
+ 
+# Group 1's Recursive Decoding Subroutine (pseudocode)
+#  (for "decode", all four local variables must be implemented ON THE
+#              STACK, and NOT in registers; implement the code literally,.
+#              no optimizations.  We're trying to teach you something.
+#   remember:  result returned in v0; preserve all except t regs)
+#
+# FUNCTION decode( wordarr, bytearr ): UNSIGNED INTEGER;
+#    (wordarr, bytearr passed by reference)
+#  LOCAL UNSIGNED INTEGER m, r, x, y;
+#  BEGIN
+#    x := ONE'S-COMPLEMENT of codgen();
+#    IF ([contents of word at "wordarr"] = 0) THEN  
+#      [byte pointed to by "bytearr"] := 0;
+#      r := x;
+#    ELSE
+#      y := decode( wordarr+, bytearr+ );  # "k+" means "successor in k"
+#      m := ( x - y ) - [contents of word at "wordarr"];
+#      [byte pointed to by "bytearr"] := [the eight bits at "m"<20:13>];
+#      r := TWO'S-COMPLEMENT OF codgen();
+#      r := x + y + m + r + 5;
+#    ENDIF;
+#    RETURN( r );
+#  END;
+ 
+ 
+# ----------------------------------------------------------
+# The following are the ONLY lines that may appear in the
+# ".data" section of the code.  You may add NO other lines.
+# NO additional global variables.
+# ----------------------------------------------------------
+ 
+ 
+	.data
+plain:	.space	132		# room for 132 characters
+ 
+	.align 4
+seed:	.word    0			# 32-bit UNSIGNED INTEGER.
+ 
+abc:	.word	0x9fdd9158	# string "abc", encoded
+	.word	0x85715808
+	.word	0xac73323a
+	.word	    0
+coded:	.word	0x015e7a47	# the real encoded data
+	.word	0x2ef84ebb
+	.word	0x177a8db4
+	.word	0x1b722ff9
+	.word	0x5dc7cff0
+	.word	0x5dc9dea6
+	.word	0x1da0c15a
+	.word	0xe4c236a2
+	.word	0x3d16b0d0
+	.word	0x1f397842
+	.word	0xaae0d2ba
+	.word	0x11246674
+	.word	0x0845317f
+	.word	0xd5512dad
+	.word	0xb6184977
+	.word	0xd293a53e
+	.word	0x7d9c2716
+	.word	0xd917eae6
+	.word	0xd8852384
+	.word	0x286e46f9
+	.word	0xce566029
+	.word	0xcefe7daf
+	.word	0x62d726d4
+	.word	0x0dbaeb2d
+	.word	0x95f57c60
+	.word	0xed515141
+	.word	0x29b77d0f
+	.word	0x9f7b8d0c
+	.word	0x45a8395a
+	.word	0xfead2b72
+	.word	0x883d434c
+	.word	0xed8ddf60
+	.word	0xe51e65e4
+	.word	0x19bf6bb1
+	.word	0xfeb505ec
+	.word	0x662aa23c
+	.word	0xf6827cf8
+	.word	0xd1dc7a5c
+	.word	0x4fa5b066
+	.word	0x7ddd25a4
+	.word	0xa8ba8e8a
+	.word	0x72846227
+	.word	0xf8f636fb
+	.word	0x2b389a9c
+	.word	0xe4038bf6
+	.word	0x6e169877
+	.word	0xad028132
+	.word	0x84dbfe8c
+	.word	0x243762ff
+	.word	0x59c8f80c
+	.word	0xb6e0db4b
+	.word	0xedb8cab7
+	.word	0xcd4b39f6
+	.word	0xaf263741
+	.word	0x18d9965f
+	.word	0x1ab1f037
+	.word	0x5b458792
+	.word	0xc94d960d
+	.word	0xd45cedea
+	.word	0x2160aca3
+	.word	0x93c77766
+	.word	0x2d66e105
+	.word	0x9ff74d4f
+	.word	0x6dc22f21
+	.word	0x6b03d689
+	.word	0x5fc48de0
+	.word	0x1138f000
+	.word	0xccb58e57
+	.word	0xf9c8e200
+	.word	0x7ab26e3c
+	.word	0xc61dcb3e
+	.word	0x6aefccb0
+	.word	0x7a452f05
+	.word	0xa5cf0731
+	.word	0xa249383f
+	.word	0x628fe534
+	.word	0xcad81710
+	.word	0x7f616276
+	.word	0x3ce18308
+	.word	0xed4857ff
+	.word	0xd1e5b1d1
+	.word	0xc2e84dc2
+	.word	0xaa003742
+	.word	0xaf637488
+	.word	0x831afc48
+	.word	0x287a69a0
+	.word	0x6e04546e
+	.word	0x13dffa07
+	.word	0x3232fb10
+	.word	0xd69e2e09
+	.word	0x355d8dc7
+	.word	0xef902301
+	.word	0x9a89ac15
+	.word	0x967dc900
+	.word	0x08dc2b1c
+	.word	0x6b5be690
+	.word	0x894b0e02
+	.word	0xe26af9af
+	.word	0xa6fd3b23
+	.word	0xfcf213e5
+	.word	0x85217608
+	.word	0x7fd3be8b
+	.word	0xa2e757fb
+	.word	0x3717a341
+	.word	0x85ee426d
+	.word	0x394bb856
+	.word	0x12ac98c3
+	.word	0xec7d4ab5
+	.word	0x721b6989
+	.word	0x30e36360
+	.word	0xaa018403
+	.word	0x9ee61196
+	.word	0xa8697adc
+	.word	0x51e9d65a
+	.word	0x11023594
+	.word	0xc4c4b36b
+	.word	0xda80bf7a
+	.word	0xbd5a645e
+	.word	0x18cea918
+	.word	0xa723dda8
+	.word	0x0126c05e
+	.word	0x2962d48a
+	.word	0xd5f7d312
+	.word	0xb8947041
+	.word	0x7c1e2e9a
+	.word	0x945eeac3
+	.word	0x7110fb1c
+	.word	0xa7bc72cc
+	.word	0xdf47dfbb
+	.word	0x09a1c6c8
+	.word	0xc2e41061
+	.word	    0
+ 
+ 
+# ----------------------------------------------------------
+# The following is the main program.  You may not change this.
+# You may only add your subroutines AFTER the "infinite end loop" instruction here.
+# You MUST have two subroutines named "codgen" and "decode".
+# BOTH must adhere to our calling conventions; 
+# both MUST preserve all registers except v-regs and t-regs;
+# we are going to TEST for this when we run your code.
+# ----------------------------------------------------------
+ 
+ 
+	.text
+	.set noreorder
+main:	li	$s0, 0x0e0657c1	# initialize "seed"
+	la	$s1, seed	# initialize "seed"
+	sw	$s0, 0($s1)
+	la	$a0, coded	# address of start of coded words
+	la	$a1, plain	# address of start of decoded bytes
+	bal	   decode	# outer call to recursive "decode"
+end:
+	b       end             # infinite loop; plaintext now in "plain".
+ 
+ 
+# ----------------------------------------------------------
+# Group 1's assembly code for Function CodGen :
+# ----------------------------------------------------------
+
+	# your activation record diagram here.
+
+codgen:		# your code here.
+
+
+# ----------------------------------------------------------
+# Group 1's assembly code for Function DeCode :
+# ----------------------------------------------------------
+
+	# your activation record diagram here.
+
+decode:		# your code here.
+
+
+# end of file.